Answer:
Explanation:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Answer:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Explanation:
Which of the following are used to make
predictions?
hypotheses
laws
theories
Answer:A hypothesis is a tentative explanation that can be tested by further investigation. A theory is a well-supported explanation of observations. A scientific law is a statement that summarizes the relationship between variables. An experiment is a controlled method of testing a hypothesis.
Explanation:
An epicenter station is4,000 km away. How long after the the first wave did the first wave arrive?
The first wave appear after 320 seconds and after the arrival of P wave
We can use the formula TD = d × t / 100 km
TD = d × t / 100 km
= ( 4000 km × 8 s ) / 100 km
= 32000 km /s / 100 km
= 320 seconds
The first s-wave will arrived in 320 seconds after the arrival of the first p-wave
The earliest waves to reach a seismograph are known as P waves, or primary waves. The fastest seismic waves, known as P waves, can pass through solid, liquid, or gas. On the medium they travel through, they leave a trail of compressions and rarefactions
The second waves to arrive during an earthquake are called S waves, or secondary waves. They can only pass through solids and are substantially slower than P waves
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______ is the amount of heat present a.energy b.temperature c.potential d.thermometer
Answer:
[tex]b[/tex]
[tex]temperature[/tex]
15) 1 The formula of methane is CH4 and the formula of ethane is C₂H6.
Which row describes diffusion and the relative rates of diffusion of methane and ethane?
The relative rate of diffusion is faster of methane than methane and particles move from high concentration to low concentration.
Diffusion is the spreading of particle from a region of higher concentration to a region of lower concentration.
Diffusion is the process by which molecules move in the presence of a concentration gradient. All living things go through this crucial phase. The movement of chemicals into and out of cells is aided by diffusion.
The molecular weight of methane is lower than the molecular weight of ethane so lower the molecular weight easier will be its diffusion. So, methane will diffuse more easily than ethane.
So, According to the question, row B describes diffusion and the relative rates of diffusion of methane and ethane.
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Your question is incomplete. Please find the missing image below.
what would be the molarity of a solution prepared by diluting 250.0 ml of 0.400m sulfuric acid with 1000 ml of water?
The final concentration of sulfuric acid in terms of molarity is 0.08 M.
The molarity of a solution expresses the concentration in terms of the number of moles of solute per liter of solution. Since the volume of the solution increased, the molarity of the solution will change.
First, let us solve for the number of moles of sulfuric acid based on the initial concentration and volume. Volume must be converted to L in order for the units to have consistency.
number of moles = molarity*volume
number of moles = 0.40 M * 250 mL * ( 1 L/1000 mL)
number of moles = 0.10 moles
Then, let us solve for the new concentration by dividing the same number of moles with the new volume. The number of moles remains the same since there is no addition of solute.
final concentration in terms of molarity = number of moles / total volume
final concentration = 0.10 moles / [(250mL+1000mL)*(1L/1000mL)]
final concentration = 0.08 M
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which element requires the least amount of energy to remove the outer-most electron from a gaseous atom i the groud state
The element that requires the least amount of energy to remove the outer-most electron from a gaseous atom in the groud state is Sodium (Na). That is option 3.
What is a ground state of an atom?A group state of an atom is defined as the level of energy attained by an atom in which all its electrons are in the lowest possible energy levels.
From the periodic table, the elements are arranged in groups and periods according to their atomic mass number.
From the atoms listed, sodium is element that requires the least amount of energy to remove the outer-most electron from a gaseous atom in the groud state.
This is so because of the following reasons:
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Complete question
Which Element Requires The Least Amount Of Energy To Remove The Most Loosely Held Electron From A Gaseous Atom In The Ground State?
(1) bromine
(2) calcium
(3) sodium
(4) Silver
www 15. Using the idea of particles explain why: a. The smell of burnt food travels through the houses? b. When two solids are placed on top of each other, they do not mix? c. Pumping up your bike tyres gives a smooth ride? d. Smokers can cause lung damage in other people? e. Heating gas in a closed container will increase its pressure? f. Poisonous gasses from a factory chimney can affect a large area?explain it ?
a. The smell of burnt food travels through the houses- Because the particles are really heated up and have a lot of kinetic energy, which causes them to move quickly, the stench of burnt food permeates the entire house.
b. When two solids are placed on top of each other, they do not mix- Because they have clear boundaries and a definite shape, two solids stacked on top of one another do not mix.
c. Pumping up your bike tires gives a smooth ride- Because the tire's air pressure is what maintains it in place. Even though the tires appear to be firm when you push on them with your palm, they actually have a lot of give as the vehicle's weight shifts and it bounces around the road.
d. Smokers can cause lung damage in other people- The heart and blood arteries are impacted by secondhand smoke, which raises the risk of suffering a heart attack. The risk of developing and passing away from heart disease rises when people are exposed to secondhand smoke.
e. Heating gas in a closed container will increase its pressure- When gases in containers are heated, the average speed of their molecules increases. They consequently strike the container walls more frequently, more forcefully, and with greater force. Therefore, when the gas's temperature rises, it is under more pressure.
f. Poisonous gasses from a factory chimney can affect a large area- manufacturing chimney smoke, and power plant emissions all contribute to air pollution. Acids are created when poisonous gases, like sulfur dioxide, combine with rain and mist. A large area of plants are killed when acid rain occurs.
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when a 12.7 g chunk of zinc dissolves in 500. ml of 1.450 m hcl, what is the concentration of hydrogen ions remaining in the final solution? (asume the volume does not change during the reaction)
Concentration of hydrogen ions remaining in the final solution is [tex].673 M[/tex]
In original solution we have 1.450M of HCl
1.450 M means 1.450 moles of HCl in 1 liter of water
Therefore, number of moles of HCl in 500ml of water will be
= [tex]1.450*0.5[/tex] moles
= 0.725 moles of HCl
Reaction between HCl and Zn happens when zinc is added -
[tex]Zn(s) + 2HCl[/tex] → [tex]ZnCl_{2} + H_{2}[/tex]
Therefore two moles of HCl is needed for 1 mole of zinc
Thus number of moles of HCl needed to react with 12.7g of Zinc will be
= [tex](12.7/ 65.38 moles of Zn )* (2moles of HCl/mole of Zn)[/tex]
= .388 Moles
So moles of HCl left = [tex]0.725 - .3888[/tex]
= 0.3365 moles
In 1 Mole of HCl there is 1 mole of H because
[tex]HCl[/tex] → [tex]H^{+} + Cl^{-}[/tex]
Therefore in 0.3365 mole HCl there will be 0.3365 moles of H
Thus final concentration of H ions in final solution is =
= [tex]0.3365mole/0.5 L[/tex]
= 0.673M
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the pits in a cd are 1.6e-8 m deep. how many of these pits would need to be stacked on top of each other to make a hole .305 m deep?
Answer:
4.5 written in scientific notation is 4.5×100 4.5 × 10 0 .
The only exponent number that will produce 1 as the value of the number is 0.
Explanation:
34. Which of the following substances is most likely to exist in the liquid state at room temperature?
A) butane
B) 2-methylpropane
C) cyclobutane
D) propanal
E) ethane
The most likely organic compound to exist in the liquid state at room temperature is Propanal; option D
What are organic compounds?Organic compounds are the compound which are obtained from organic materials such as plants ad animals,
Organic compounds can also be obtained from the remains of dead plants and animals.
Generally, organic compounds are composed of the following elements:
Carbon, Oxygen, hydrogen, Nitrogen, Phosphorus, and Sulfur.
Organic compound include hydrocarbons which usually exist as gasses.
However, with increase in molecular weight as well as presence of other intermolecular forces such as hydrogen bonds, organic compounds can exists as solids and liquids.
Considering the give compounds, Propanal will most likely exist as liquid because of the presence of hydrogen bonding in the molecules.
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Conductivity is directly related to the number of ions present in a solution. Insoluble compounds do not dissociate to any appreciable extent. What kind of conductivity would you expect such a solution to have?.
An incompletely dissociating solution would have weak conductivity. Ions that have completely broken free from their bonding conduct more effectively than those that are still connected.
Why conductivity is important?Aquatic organisms and plants prefer a particular spectrum of salinities. Outside of this area, they will have negative effects and possibly even die. Others can endure both low and high salinities, whereas certain creatures can only endure low salinity.
In addition to its direct effects on aquatic life, salinity has various other important influences on the chemistry and density of water.
How is Conductivity measured?
The most popular way to quantify saltiness is in parts per thousand, or grams per liter.
A Siemen is a unit used to measure conductivity. It is also known by its smaller equivalents, the milli-Siemen and the micro-Siemen, which are each one millionth of a Siemen. The most popular type of conductivity is referred to as specific conductivity.
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- Why is the FBI interested in studying explosives?
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the.
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the (D) Average distance between molecules becomes greater.
An ideal gas is:
1) made up of molecules which are in constant random motion in straight lines.
2) all collisions are perfectly elastic, there is no loss of kinetic energy during the collision.
3) follows ideal gas law: p·V = n·R·T.
4) the gas particles have negligible volume.
At low temperatures, volume of the gas is not negligible.
Real gases may be expected to deviate from Charles's law at high pressures.
Real gases may be expected to deviate from Charles's law near the liquefaction temperature.
Missing options:
(A) Collisions with the walls of the container become less frequent
(B) Average molecular speed decreases
(C) Molecules have expanded
(D) Average distance between molecules becomes greater
(E) Average molecular kinetic energy decreases
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__________________________ which is a sickness caused by ingesting harmful bacteria, and can be prevented by cooking meat and eggs at a proper temperature.
Food poisoning
decomposition
influenza
Strep throat
propane (c3h8) is burned with air. for each case, obtain the balanced reaction equation for complete combustion a. with the theoretical amount of air. b. with 20% excess air. c. with 20% excess air, but only 90% of the propane being con- sumed in the reaction.
Combustion of propane is the exothermic reaction
Combustion reactions are reactions in which a substance reacts with an excess of air or oxygen to form products. the combustion of hydrocarbons in the presence of stoichiometric or excess levels of oxygen forms carbon dioxide and water and with the release of heat the molecular formula of propane is C₃H₈. one mole of propane needs five moles of oxygen for complete oxidation to form carbon dioxide and water.
The balanced equation for combustion of propane is:
C₃H₈(g) + 5O₂(g)→3CO₂(g)+4H₂O(g)
The products are 3 moles of CO₂ and 4 moles of H₂O for every mole of the alkane burnt completely. propane combust completely
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Using the dimensional Analysis
In the Above questions to convert 14,612 mL to DAL which of the following portrays to correct set up
Option A displays the accurate dimensional analysis for converting 14,612 mL to daL.
Determining the value of measurement across many units is crucial in many situations.This means that we must convert from one unit to another. The application of a conversion factor enables such a conversion.Now that we are aware of a conversion factor, we can utilize it to change mL into daL. In order for the units to cancel out, this conversion factor needs to be dimensionally precise in its arrangement.Option A displays the accurate dimensional analysis for converting 14,612 mL to daL.Learn more about unit conversion at:
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A children's liquid medicine contains 100 mg of the active ingredient in 5 mL. If a child should receive 150 mg of the active ingredient, how many milliliters of the medicine should the child be given? For the purposes of this question, assume that these numbers are exact. The package states that one teaspoon (tsp) is approximately equal to 5 mL. Calculate the number of teaspoons that the child should receive. Use the given approximation as your conversion factor.
Answer:
Explanation: A children's liquid medicine contains 100 mg of the active ingredient in 5 mL . If a child should receive 150 mg of the active ingredient, how many milliliters
Convert 300.0mm into m using dimensional analysis
Answer:
How to Convert Millimeters to Meters. To convert a millimeter measurement to a meter measurement, divide the length by the conversion ratio. The length in meters is equal to the millimeters divided by 1,000.
Explanation:
A large rainstorm hits your town, and it rains all day. how does this event relate to the water cycle, and what happens to the water after the rain storm? first, state which stage of the water cycle is demonstrated by the storm. next, use the remaining stages of the water cycle to explain what happens to the water as the water cycle is completed. remember that the stages of the water cycle include evaporation, precipitation, condensation, and runoff.
Answer: here is the answer, I tried. lol, remember to re-write it!
The first stage is where it rains into grass, water, anything. Then it goes into the air and into more clouds, and produce more rainfall, which is evaporation. After that, it goes into precipitation, where it can cause hair, mist, rain, or snow. Then condensation, where water collects droplets when there is humid air, into the clouds. Then runoff, where the water is transported to a new location to produce rainfall.
Molecules have Question 19 options: A) only potential energy. B) neither kinetic nor potential energy. C) only kinetic energy. D) both potential and kinetic energy.
Answer:
D
Explanation:
molecules have potential energy and kinetic energy.
Tempreture is defined as the average kinetic energy and internal energy is PE+KE. Pptential energy in particles or molecules is just there position relative to one another. A gas which has seperated particles will have a greater potential energy than a solid/liquid.
which bonds maintain the primary structure of a protein? question 7 options: ionic bonds hydrogen bonds peptide bonds disulfide bonds\\
Proteins have four structures primary, secondary,m tertiary, and quaternary. The primary structure of the protein has been known to have peptide bonds. Thus, option C is correct.
What are peptide bonds?Peptide bonds are the chemical bonds that are involved in protein polymer formation by linking the amino acid chains. They are also called amide bonds that are present between the nitrogen and the carbonyl atom.
The primary structure of the proteins includes the amino linked by the peptide bonds that make them look like linear structures. The secondary structures have hydrogen bonds and the tertiary have ionic and hydrophilic hydrogen bonds.
Therefore, option C. the primary structure of the protein contains peptide bonds.
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What do sound waves and infrared waves have in common, and what makes them different?
Both carry energy through space, but sound waves are mechanical and infrared waves are electromagnetic.
Both can transfer energy through matter, but sound waves travel through air and infrared waves travel through space.
Both can transfer energy through matter, but sound waves can be heard and infrared waves can be seen.
Both carry energy through space, but sound waves require matter to pass through and infrared waves do not.
Wave X and Wave Y are mechanical waves, and Wave Z is an electromagnetic wave.
Wave X and Wave Y are electromagnetic waves, and Wave Z is a mechanical wave.
Wave X and Wave Z are electromagnetic waves, and Wave Y is a mechanical wave.
Wave X and Wave Z are mechanical waves, and Wave Y is an electromagnetic wave.
The statement that describes the similarity and difference between sound and infrared waves is as follows: both carry energy through space, but sound waves are mechanical and infrared waves are electromagnetic (option A).
What are sound waves?Sound waves are the longitudinal waves of pressure that is transmitted through any plastic material i.e. audible sound.
Also, infrared waves are electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700nm and 1mm.
Both sound and infrared waves carry energy, however, the difference between both waves is that sound waves are mechanical and infrared waves are electromagnetic.
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2. Note how many of each element would be found in one particle of the following compounds:
Compound
sugar (C12H22O11)
salt (NaCl)
baking soda (NaHCO3)
Number of Each Element
Sugar has 12 elements of carbon, 22 elements of hydrogen, and 11 elements of oxygen.
Salt has 1 element of sodium, and 1 chlorine
Baking soda has 1 sodium, 1 hydrogen, 1 carbon and 3 oxygen
What is an element?A chemical element is a substance that cannot be further broken down by any chemical reaction.
Each element has its own specified number of proton in their nuclei.
An element’s atoms must all have the same number of protons but they can have different numbers of neutrons and hence different masses.
Examples of elements include:
hydrogenheliumlithiumcarbonoxygenSome elements are more abundant that others in the universe. At 75 percent, hydrogen is the most abundant element in the universe, followed by helium at 23 percent, then oxygen at 1 percent.
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What are the main categories of properties of matter? Mark all that apply.
Physical
Chemical
Pure Substance
Mixture
Physical, chemical, pure substance, and mixture are all categories of properties of matter.
What is Matter?
The matter is defined as something that has mass and occupies space.On basis of physical state, the matter is classified into solid, liquid, or gas.On basis of chemical property, the matter is categorized as homogenous and heterogeneous.The matter is also categorized into pure substances and mixtures.Pure substances are further divided into elements and compounds.The matter is made up of specific chemical and physical properties called elements which are not further broken down.Therefore, physical, chemical, pure substances, and mixtures are the main categories of matter.
Hence, all the given options are correct.
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Question 7 of 14
How much energy is released if a sample loses 0.001 kg mass through
radioactive decay?
OA. 3× 102 J
B. 9 × 10¹3 J
O C. 3 × 105 J
OD. 9×1019 J
Answer:
as we know that E= mc²
E= .oo1×(3×10⁸)²
E= .001×9×10¹⁶
we can right .001 =1×10‐³
E=1×10-³×9×10¹⁶
E=9×10¹³
ans is B 9×10¹³
9×10¹³J is the energy that is released if a sample loses 0.001 kg mass through radioactive decay. Therefore, the correct option is option B.
What is energy?Energy, which is observable in the execution of labor as well as in the form of light and heat, is the quantitative quality that's also transferred to something like a body or to any physical system in physics. Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy. The joule is the SI's (International System of Units) unit of measurement of energy (J).
A moving object's kinetic energy, an object's potential energy, an object's elastic energy, chemical energy linked to chemical reactions, electromagnetic radiation's radiant energy, and the internal energy of a thermodynamic system are examples of common kinds of energy.
E= mc²
E=0 .001×(3×10⁸)²
E=0.001×9×10¹⁶
E=9×10¹³J
Therefore, the correct option is option B.
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i need help please its due tmr for school!
Number 4 -
1 kilogram = 1000 grams
0.79kg * 1000g = 790g
0.3kg * 1000g = 300g
790g - 300g = 490g
Number 5 -
24 hrs / 3 = 8
That means the lamb was fed 8 times in one day.
1 liter = 1000 milliliters
Using this conversion, we could do 290 * 8 to figure out how many milliliters it was fed in one day.
290 * 8 = 2320
2320 / 1000 = 2.32 liters fed to the lamb in one day
Working on my mental math this way<3
water molecules are made of hydrogen atom(s) and oxygen atom(s). (use only one number per blank.) quiozlet
Water molecules are made of 2 hydrogen and 1 oxygen atom. H2O.
Two hydrogen atoms bound together by covalent bonds to one oxygen atom make up a water molecule. The shared electrons in covalent bonds are drawn to oxygen atoms because they are electronegative.Polar covalent bonds are present. Due to the extra electron sharing, oxygen atoms have a tiny negative charge, whereas hydrogen atoms have a slight positive charge (from the extra un-neutralized protons).The minor negative charges on the oxygen atoms of other water molecules are drawn to the slight positive charges on the hydrogen atoms in a water molecule. This bond is called hydrogen bond which is weak bond. A liquid state of water is due to these small, weak hydrogen bonds.It can be concluded that hydrogen atom have 2 hydrogen and 1 oxygen atom which are bounded together by covalent bond.
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Calcium carbonate decomposes into calcium oxide and carbon dioxide. If 224 g of calcium carbonate decomposes, how many moles of carbon dioxide gas is produced?.
What is produced is 2.24 moles of carbon dioxide.
What is the number of moles of carbon dioxide?We have to apply the stoichiometry of this reaction in trying to answer this question. Recall that what we have here is a decomposition reaction. The calcium carbonate is decomposed to give calcium oxide and carbon dioxide.
Number of moles of calcium carbonate = 224 g/100 g/mol = 2.24 moles
We can see that the reaction is 1:1 hence, the number of moles of carbon dioxide that would be produced in this reaction would also be 2.24 moles of carbon dioxide.
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The number of moles of carbon dioxide gas produced from the reaction is 2.24 mole
How to determine the moles of calcium carbonate, CaCO₃Mass of CaCO₃ = 224 gMolar mass of CaCO₃ = 100 g/molMole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 224 / 100
Mole of CaCO₃ = 2.24 moles
Balanced equationCaCO₃ -> CaO + CO₂
From the balanced equation above,
1 mole of CaCO₃ decomposed to produce 1 mole of CO₂
How to determine the mole of CO₂ produced from the reactionFrom the balanced equation above,
1 mole of CaCO₃ decomposed to produce 1 mole of CO₂
Therefore,
2.24 moles of CaCO₃ will also decompose to produce 2.24 moles of CO₂
Thus, 2.24 moles of CO₂ were produced from the reaction
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8. The number of
10.
9. The electric charge on an atom is neutral because the number of protons is the same as
the number of
and each of their individual charges cancel out.
are atoms of the same element with a different number of neutrons.
number.
11. What does it mean when a nucleus is "stable?"
13. What is alpha decay?
is different for each element and is known as the
12. If a nucleus is unstable and breaks apart, it is called
14. What is beta decay?
15. What is gamma decay?
Answer:
12.6
Explanation:
identify what each ghs symbol signifies about the type of chemical present in a bottle or storage cabinet.
If this symbol is seen on a chemicals bottle, it means that it is an oxidizing chemical.
What is the symbol?
In a chemical laboratory there is usually a special cabinet for the storage of chemicals. The chemicals that are stored are often chemicals that are used to carry out one kind of experiment or the other in the laboratory.
However, symbols are used to symbolize the peculiarity of each particular chemical. Now we can see the symbol as shown in the image attached. If this symbol is seen on a chemicals bottle, it means that it is an oxidizing chemical.
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