Select all of the objects that (essentially) maintain a constant velocity.
A planet in orbit around a star
A hockey puck sliding on the ice
An apple sitting on a table
A baseball after being hit by a bat
Answer: baseball after being hit by a bat planet in orbit around a starExplanation:
Which of the following is an element?
A. Methane
B. Ozone
C. Ice
D. Air
Answer:
Methane
Explanation:
Beause it's a compound
Answer:
A methane
Explanation:
Methane is one carbon compound in which carbon is attached by hydrogen atom's. It's molecular formula is CH4
which metal is best for making metal canister
Answer:
Are there any answer choices? There are many options: stainless steel, aluminum, etc.
Explanation:
you have a 5.0 ml sample of a protein in 0.5m nacl. you place the protein/salt sample inside dialysis
The final Concentration of salt having a 5.0 ml sample of a protein in 0.5m nacl. you place the protein/salt sample inside dialysis is 0.62mM.
What is Concentration?Concentration is defined as the ratio of number of moles of substance to the volume of the substance occupied.
The dialysis is normally dilution of the solution as the dialysis bag the salt present in protein sample is pass and go to the dialysing rhe solvent (water).
CalculationAs we know that,
M1V1 = M2V2
M1 and M2 are the initial and final concentration of NaCl in the dialysis bag.
V1 and V2 are the initial and final volume of NaCl in the dialysis bag.
Given,
M1 = 0.5M
V1 = 5mL = 0.005L
V2 = 4 + 0.005 = 4.005L
By substituting all the values, we get
M2 = 0.5 × 0.005/4.005
= 0.00062M
= 0.62mM.
Thus, we calculated that the final Concentration of salt is 0.62mM.
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DISCLAIMER:
The above question is incomplete.
Here is the complete question:
You have a 5.0 ml sample of a protein in 0.5M NaCl. You place the protein/salt sample inside dialysis tubing and place the bag in a large beaker of distilled water. Your goal is to remove as much NaCl from the sample as possible. Since you know that the final salt concentration will be the same inside the tubing as out, you can calculate the final concentration of the salt.
A. If you decide to place the dialysis bag in 4.0 L of distilled water for 12 h the final concentration of the salt would be in ________ mM
Using the periodic table above and your knowledge of patterns and trends on the table, which of the following elements is the best conductor of electricity? (1 pt)
*
1 point
Titanium (Ti, #22)
Silicon (Si, #14)
Oxygen (O, #8)
Argon (Ar, #18)
The metals are good conductor of electricity, thus among this titanium is the best conductor of electricity.
What are conductors?Conductors is defined as a substance or type of material that allow flow of charge or electricity in one or more direction. Metals are commonly consider as a good conductor of electricity. It allow electricity to flow through them very easily and produce electric current.
Metals are defined as the elements that are typically hard due to presence of strong metallic connection between the atoms.
Thus, metals are good conductor of electricity, thus among this titanium is the best conductor of electricity.
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(bonus) Which of the following sets of elements should have the most similar chemical properties? (1 pt)
*
1 point
Sodium (Na, #11), Aluminum (Al, #13), Chlorine (Cl, #17)
Chlorine (Cl, #17), Argon (Ar, #18), Potassium (K, #19)
Beryllium (Be, #4), Calcium (Ca, #20), Radium (Ra, #88)
Beryllium, Calcium, Radium elements should have the most similar chemical properties.
What are chemical properties?
Chemical properties can be defined as a characteristics or behavior of the substance that be observed when it undergo a chemical change or reaction. Chemical properties may include flammability, toxicity, acidity, basicity, reactivity, heat of combustion and many more.
Beryllium, Calcium and Radium are the elements of alkaline earth metal and the share most of the similar chemical and physical properties.
Thus, Beryllium, Calcium, Radium elements should have the most similar chemical properties.
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What is the mass of reactants and products: 2H2 + O2 —> 2 H2O
The molecular mass of reactants and products in 2H2 + O2 —> 2 H2O is 36 g/mole.
What is molecular mass?Molecular mass can be defined as the some of the atomic masses of all the atoms in the molecule of a substance.
It is a molecule relative mass represented by atomic mass unit. It is used to those substance whose constituent particles are molecule.
The molecular mass of 2H2 + O2 —> 2 H2O can be calculated as:
= 2(1x2) + (16x2) -> 2(1x2 + 16)
= 2(2) + 32 ->2(2 + 16)
= 4 + 32 -> 36
= 36 -> 36
Therefore, the molecular mass of reactant is equal to the molecular mass of product.
Thus, the molecular mass of reactants and products in 2H2 + O2 —> 2 H2O is 36 g/mole.
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How would I find the mass of the statue? Is it conversions or just basic math?
The replacement of gold from trapped pedestal is a mathematical equation.
What is density?Density is defined as the measurement of how tightly the material is packed together. It can also be defined as the substance mass per unit volume.
The S.I. unit of density is kilogram per cubic meter.
Density = mass / volume
Thus, the replacement of gold from trapped pedestal is a mathematical equation.
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Reading chemical symbols
Answer:
do u need answer for all of them?
take two carbon atoms and join by two springs making a double bond. complete the ethene moleeule by adding two hydrogen atoms to each carbon atom. each carbon atom should now have the usual four bonds. this is ethene which is also called ethylene. the structure for ethene is
Ethene (H2C=CH2) is a gaseous by-product of the long-chain hydrocarbons that are cracked to create highly sought-after goods like gasoline and aviation fuels.
What is ethene used for?The uses of ethene include: It is employed in the creation of polythene. It is used to make fruits artificially ripe. Ethene is also utilised to create other beneficial molecules such ethanol, oxyethylene flame, and ethylene glycol, which is used as an antifreeze.Does ethylene resemble ethene?A substance having the chemical formula C2H4 is ethylene, commonly known as ethene. It is both the most easily manufactured organic compound in the world and the simplest alkene. Unsaturated hydrocarbon ethylene, often known as C2H4, is utilised in industrial facilities and is occasionally found in typical medicine cabinets as a hormone.learn more about Ethene here
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Periodic Table Project: Element Presentation Your Favorite Element Student Guide Assignment Prompt In this assignment, you will research an element of your choice from the periodic table. Using reference materials and Internet sites, you will collect information about the element.
The element from the periodic table which is choose is Hydrogen.
Behaviour of hydrogen atom as electronegative atomHydrogen behaves as electronegative atom when it combine with the elements of group 1 and group 2. Since, hydrogen have the capability to accept an electron to acquire stable noble gas electronic configuration like helium.
Behaviour of hydrogen atom as electropositive atomHydrogen behaves as electropositive atom when it combine with the elements of group 13, 14, 15, 16 and group 17. Since, hydrogen have the capability to lose an electron to acquire stable noble gas electronic configuration.
Thus, from. above we concluded that hydrogen have unique property rather than another elements. So, it is best suited for assignment project.
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Tony walks at an average speed of 70m/min from his house to school. if the distance between his home and the school is 2100 m, how much time does it take for tony to walk to school?
Tony with an average speed of 70m/min walks the distance from his house to school in a time of: 30 min
The formula and procedure we will use to solve this exercise is:
t = x/v
Where:
x = distance
t = time
v = velocity
Information about the problem:
v = 70m/minx= 2100 mt = ?Applying the time formula we have that:
t = x/v
t = 2100 m/ (70m/min)
t = 30 min
What is velocity?It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
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part 1. determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. show your work.
The ideal gas equation can be used to determine the molar mass of the substance with the help of the moles. The molar mass of the gas having a mass of 0.458 grams is 9.15g/mol.
What is the ideal gas law?
Ideal gas law gave the relation between the moles, pressure, temperature, volume, and the gas constant. The moles of the ideal hypothetical gas can be used to calculate the molar mass.
An ideal gas equation is given as:
PV =nRT
Given,
Mass = 0.458 gm
Pressure (P) = 0.98 atm
Volume (V) = 1.2 L
Temperature (T) = 287 K
Gas constant (R) = 0.0821
Substituting values in ideal gas as:
0.98 × 1.2 = n × 0.0821 × 287
n = 1.18 ÷ 23.56
n = 0.05moles
Now, moles are used to calculate molar mass as:
molar mass = mass ÷ moles
= 0.458 ÷ 0.05
= 9.15g/mol
Therefore, 9.15g/mol is the molar mass of the unknown gas.
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a material that has more than one set of properties
Answer:
heterogeneous mixture
Explanation:
the particles of each substance can be seen and the mixture has more than one set of properties.
how is copper obtained and separated from other nearby substances
Answer:
Explanation:
Copper mining is usually performed using open-pit mining, in which a series of stepped benches are dug deeper and deeper into the earth over time. To remove the ore, boring machinery is used to drill holes into the hard rock, and explosives are inserted into the drill holes to blast and break the rock.
When making the heating curve for your experiment today the water begins to plateau at a specific temperature. What is this state called?.
From the question, the point at which the heating curve does plateau is the boiling point of water.
What is the heating curve?The heating curve is used tool that we use to see how the temperature change by the addition of heat affects the state of matter in which the material is obtained. The vertical axis could be used to plot the temperature while the horizontal axis could be used to plot the changes in the state of matter.
There are three states of matter namely;
Liquid
Solid
Gas
Water can be able to exist in all the states of matter that have been mentioned but there is a temperature range at which each state of matter can be observed. Thus we have the solid range, liquid range and the gaseous range of water.
Looking at the graph, when we begin to heat the water, the water is liquid at the start but the temperature increases rapidly. This increase would continue until the temperature of the water begins to plateau. The point of plateau is the boiling point of water.
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This state at a specific temperature is called phase change.
For example, evaporization is phase change process in which the water changes from a liquid to a gas (water vapor).
Other example, condensation is phase change process in which the water changes from a gas to a liquid.
Heating curve of water show how the temperature changes as water is heated up. A heating curve for water that shows transition zones (see the picture below).
The first phase change is melting, the temperature stays the same while an ice melts.
The second phase change is boiling, the temperature stays the same while a water boils.
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what element makes baking powder so reactive when it touches coke
Answer: El polvo de hornear obtiene su energía de una reacción química que produce burbujas de aire, mientras que la levadura es un organismo vivo real que produce de gas a partir de una reacción biológica. Los dos procesos no son similares, y tampoco son intercambiables en las recetas.
Baking powder gets its energy from a chemical reaction that produces air bubbles, while yeast is an actual living organism that produces gas from a biological reaction. The two processes are also not similar and are interchangeable in recipes.
Explanation:
Explain how gallium and germanium fit in Mendeleev’s predictions
Mendeleev left gaps in the periodic table to place elements not known at that time. By looking at the chemical properties and physical properties of the elements next to a gap, he predicted the properties of these undiscovered elements.
What is Mendeleev periodic table ? Based on the gaps in the periodic table Mendeleev deduced that in these gaps elements were yet to be discovered. Based on other elements in same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge) respectively.eka-aluminum ⇒ gallium (Ga)eka-boron ⇒ scandium (Sc)eka-silicon ⇒ germanium (Ge)Thus we can conclude that, the chemical and physical properties of the elements next to the gap, he was able to predict gallium and germanium.
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In 1871, the atomic masses and other chemical characteristics of gallium, germanium, and scandium were unknown, but Mendeleev provided slots for each and made predictions about them.
Mendeleev's PredictionsMendeleev became so certain of the validity of his periodic table that he altered the atomic masses of known elements to make them fit where they "belonged" in it. He did this on the basis of his belief in his table alone, not any experimental evidence. In one instance, he adjusted the beryllium atomic mass from 14, which put it in Group 15 above nitrogen (N), to 9, which moved it below nitrogen. It was positioned in Group 2 above magnesium (Mg), with which it shared a closer chemical relationship. Mendeleev's bold prediction of the properties of as-yet-undiscovered elements was even more audacious.To learn more about Mendeleev's Predictions refer:
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Find the THREE true statements:
☑️If Zinc has an atomic number of 30 and a mass number of 65, the correct number of protons, neutrons, and electrons, respectively, is: 30,35,30
☑️If Magnesium has an atomic number of 12 and a mass number of 24, the correctnumber of protons, neutrons, and electrons, respectively, is: 12,24,12
☑️If Lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is: 3,4,3
☑️If Calcium has an atomic number of 20 and a mass number of 40, the correct number of protons, neutrons, and electrons, respectively, is: 20,20,20
☑️If Fluorine has an atomic number of 9 and a mass number of 19, the correct number of protons, neutrons, and electrons, respectively, is: 9,9,9
Taking into account the definition of atomic number and mass number, the three true statements are:
If Zinc has an atomic number of 30 and a mass number of 65, the correct number of protons, neutrons, and electrons, respectively, is: 30,35,30If Lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is: 3,4,3If Calcium has an atomic number of 20 and a mass number of 40, the correct number of protons, neutrons, and electrons, respectively, is: 20,20,20Subatomic particlesAll atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).
Atomic numberThe atomic number of a chemical element is the total number of protons that each atom of that element has.
Atoms in nature are electrically neutral, so the number of positive and negative particles is the same. That is, in an atom that has no charge, the atomic number also indicates the number of electrons.
Mass numberThe mass number indicates the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Mass number = (number of protons) + (number of neutrons)
So, If you know the number of protons and the mass number, the number of neutrons can be calculated as:
Number of neutrons= mass number - number of protons
This caseConsidering the definition of atomic and mass number, you can know:
Zinc has an atomic number of 30 and a mass number of 65. The correct number of protons and electrons is 30, while the number of neutrons is 65-30= 35Magnesium has an atomic number of 12 and a mass number of 24. The correct number of protons and electrons is 12, while the number of neutrons is 24 -12= 12Lithium has an atomic number of 3 and a mass number of 7. The correct number of protons and electrons is 3, while the number of neutrons is 7-3= 4Calcium has an atomic number of 20 and a mass number of 40. The correct number of protons and electrons is 20, while the number of neutrons is 40 -20= 20Fluorine has an atomic number of 9 and a mass number of 19. The correct number of protons and electrons is 9, while the number of neutrons is 19 -9= 10Finally, the three true statements are:
If Zinc has an atomic number of 30 and a mass number of 65, the correct number of protons, neutrons, and electrons, respectively, is: 30,35,30If Lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is: 3,4,3If Calcium has an atomic number of 20 and a mass number of 40, the correct number of protons, neutrons, and electrons, respectively, is: 20,20,20Learn more about number of protons, neutrons and electrons:
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1. The physician ordered Azithromycin 15 mg/kg IV star for a child who weighs 20.0 kg. How many mg would the pharmacist need to put in the IV bag?
2. Morphine sulfate is used for pain relief but can also become addicting and fatal. The physician order reads: Morphine sulfate 0.30 mg IM ( intramuscular) stat. The recommended dose is 0.01 mg/kg. Is the ordered dose a mg safe for a child who weighs 31.0 kg?
1. The pharmacist would need to put 300 mg of Azithromycin in the IV bag for the child.
2. The ordered dose of Morphine sulfate is safe for the child as 0.30 mg is slightly lower than 0.31 mg.
1. Azithromycin dosage for a child who weighs 20.0 kg:
The physician ordered Azithromycin at a dose of 15 mg/kg IV (intravenous) star.
Weight of the child (W) = 20.0 kg
Amount of Azithromycin needed = Weight of the child × Dose per kg
= 20.0 kg × 15 mg/kg
= 300 mg
Thus, the pharmacist need to put 300 mg of Azithromycin.
2. Morphine sulfate dosage for a child who weighs 31.0 kg:
The physician ordered Morphine sulfate at a dose of 0.30 mg IM (intramuscular) stat.
Weight of the child (W) = 31.0 kg
Recommended dose of Morphine sulfate = 0.01 mg/kg
= 0.01 mg/kg × 31.0 kg
= 0.31 mg
The ordered dose of 0.30 mg is slightly lower than the recommended dose of 0.31 mg for a child who weighs 31.0 kg.
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why is baking soda used in soda acid fire extinguisher?
Answer:
Explanation:
because seems it has a chemical that can remove fire they added it on a fire extinguisher
Answer:
Explanation:
why is baking soda used as acid fire extinguisher? Carbon dioxide gas is neither combustible nor helps combustion. It is heavier than air and cuts off the supply of oxygen from air and hence extinguishes the fire. … Hence, sodium bicarbonate is used in fire extinguishers.
what do you think will happen to the temperature if you use 75 ml of hcl and 75 ml of naoh instead of the 50 ml each that you used in experiment 1?
The thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.
How to explain the reaction?A neutralization occurs when NaOH and HCl are combined. Each chemical reaction has a unique heat of reaction, which is the heat exchanged during the process.
The reaction in issue is exothermic (emits heat), and the amount of heat emitted relies on the chemicals used, their concentrations, and the working temperature (it is produced at a low temperature).
The fluctuation in temperature and the mass used determine how much heat is allocated.
In this case, the thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.
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When iron is placed in nitrogen no occurs
Nothing happens if the iron rod is inserted into the nitrogen. However, when the iron rod is suspended in the air.
A non-metal, nitrogen is. As a result, it typically interacts with metals to create ionic compounds. Only when the reactants produce products that allow the system as a whole to release energy does the reaction take place. If the system requires energy to undergo the reaction, the reaction cannot take place. When iron is exposed to oxygen and moisture for an extended length of time, a process known as iron oxide occurs. At the atomic level, oxygen bonds to iron to produce the complex known as an oxide, which weakens the metal bond.
The complete question is - If a piece of pure iron is placed in pure nitrogen, nothing happens. If the iron is exposed to air, it begins to rust. What conclusion can you make about air, based on this observation?
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In this experiment you are going to use 100. Mg of sodium borohydride. How many moles of sodium borohydride will you use?.
0.00264 moles of sodium borohydride will be used.
m(NaBH₄) = 100 mg ÷ 1000 mg/g
m(NaBH₄) = 0.1 g; mass of sodium borohydride
M(NaBH₄) = 37.83 g/mol; molar mass of sodium borohydride
n(NaBH₄) = m(NaBH₄) ÷ M(NaBH₄)
n(NaBH₄) = 0.1 g ÷ 37.83 g/mol
n(NaBH₄) = 0.00264 mol; amount of sodium borohydride
Sodium borohydride is white solid and it is a reducing agent.
Sodium tetrahydridoborate is an inorganic compound with the formula NaBH₄.
Mass is a fundamental measure of the amount of matter in the object.
Kilogram (symbol: kg) is the base unit of mass in the International System of Units.
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the general molecular formula for alkanes is cnh2n 2. what is the general molecular formula for cycloalkanes? click in the answer box to activate the palette.
The cycloalkanes have the general formula CnH2n, where n is the number of carbons.
The carbon atoms of cyclic hydrocarbons, such as cycloalkanes, are organized in the shape of a ring. Additionally saturated, cycloalkanes have single bonds between all of the carbon atoms that make up the ring (no double or triple bonds). Additionally, there are polycyclic alkanes, which are compounds made up of two or more cycloalkanes linked together to form numerous rings.Cycloalkane naming adheres to a straightforward set of guidelines that are based on the same fundamental procedures used to name alkanes. The prefix "cyclo-" is used to identify cyclic hydrocarbons.Numerous organic molecules, referred to as cycloalkanes, can be found in nature or made in a lab and include rings of carbon atoms with distinctive chemical properties.Therefore, the general formula for cycloalkanes is CnH2n.
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Pleaseeeeeee help meeee
Answer:
2
1
2
3
3
1
Explanation:
In the first law, an object will not change its motion unless a force acts on it.
This is exactly how it worked in the (Last one). There is no movement with no force. The Second one seems a bit strange, but it's been known that inertia is the same as the first law. Why is that? Because there is no force acting on the water but there is some force acting on the glass.
In the second law, the force on an object is equal to its mass times its acceleration.
(First one& Third One) Increasing mass means increasing the force to accelerate with the same magnitude
In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction
The Fifth one. The combustion of the fuel produce force which is greater than the gravititional force acting on the rock. Therefore, a force has a reaction force which accelerates the rock upwards.
The Fourth is pretty much the same. A force of inertia acting as the reaction force here which refuses to move with the paper.
If you didn't get what i mean in any of those please let me know
a 3.214 g sample of magnesium reacts with 8.416 g of bromine (br2). the only product is magnesium bromide (mgbr2). how much mgbr2 is formed?
The reaction between 3.214 g magnesium and 8.416 g bromine produces 9.7 g of MgBr2.
The balanced chemical reaction of magnesium and bromine is shown below.
Mg + Br2 → MgBr2
Step 1: Convert the given mass of reactants to moles of reactants
moles Mg = mass Mg / molar mass Mg
moles Mg = 3.214 g / 24.31 g/mol
moles Mg = 0.1322 mol
moles Br2 = mass Br2 / molar mass Br2
moles Br2 = 8.416 g / 159.808 g/mol
moles Br2 = 0.0527 mol
Step 2: Bromine (Br2) is determined to be the limiting reactant. Since the stoichiometric ratio between the reactants is equal to 1, the reactant with a lower number of moles would be the limiting reactant.
Step 3: Convert moles of Br2 to the mass of MgBr2. Their stoichiometric ratio is also 1, which makes the solution easier.
mol Br2 = mol MgBr2
mass MgBr2 = mol MgBr2 * molar mass MgBr2
mass MgBr2 = 0.0527 mol * 184.118 g /mol
mass MgBr2 = 9.70 g
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please answer these questions. im sure im wrong on all them!!!!! please answer correctly too
Answer:
the graph shows that the filtrated solution was acidic but when we add nh3 (base) ,acid base reaction take place and in this reaction salt and water are form by this oh-ion concentration keep on increasing and change ph from 4 to 10
How do i find the charge?
Answer:
An easy way to work out the charge of an atom is to look at the periodic table. Elements on the left side of the table usually become positively charged ions and elements on the right side of the table typically have a negative charge. However, you can use a scientific formula to determine the formal charge of an atom.
Explanation:
during a gravimetric analysis experiment to determine the salt (nacl) content of a chicken soup sample, a precipitate of silver chloride was produced, dried and weighed. the sources of error in the analysis include
Some precipitate remained in the reaction flask after the filtration process, which is one of the sources of mistake in the analysis.
Where is the use of gravimetric analysis?Gravimetric analysis has several practical applications, such as monitoring lead concentrations in drinking water, which, if left unchecked, could result in lead poisoning and even death.
How does a gravimetric analysis work?After the sample has been dissolved, the stages necessary for gravimetric analysis are as follows: solution preparation, precipitation, digestion, filtration, washing, drying or igniting, weighing, and finally calculation.
The principle of gravitational analysis:The idea underlying gravimetric analysis is that it is possible to determine the mass of an ion in a pure substance. The mass percent of the same ion in a known quantity of an impure chemical is later determined using this method.learn more about gravimetric analysis here
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the question you are looking for is
During a gravimetric analysis experiment to determine the salt (NaCl) content of a chicken soup sample, a precipitate of silver chloride was produced, dried and weighed. The sources of error in the analysis include
I)The precipitate was not washed before it was dried.
II)The soup contained some sodium iodide in addition to the sodium chloride.
III)Some precipitate remained in the reaction flask after the filtration process.
Which of these errors could account for a lower than expected mass of silver chloride precipitate?