Answer:
2 i think should be the correct answer
Explanation:
Where do you all of the extra "stuff" in your bodies came from as you were growing ?
Answer:
from food ,cells grow ,tissue gro,organs grow body systems grow.......
i have a question on y=mx+b which is the y?
Answer:
the b is the y-intercept of the line :D
a liquid has a low boiling point and is a poor conductor of electricity. The liquid could be which of the following? select all that apply
a. H2O
b. CaCl2
c. CH4
d. FePO4
The liquid which has a low boiling point and is a poor conductor of electricity is Methane (CH4).
What is covalent Compounds?Covalent Compounds are compounds with low boiling point and are poor conductors of heat and electricity. Covalent compounds have strong intra-molecular bonds. This is because the atoms within the covalent molecules are very tightly held together.
Methane (CH4) is a liquid that has a low boiling point and is a poor conductor of electricity.
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i. TRUE OR FALSE STATEMENTS
state whether the following statements are true or false and correct the false statements
1. Atoms of all elements follow octate rule.
2. All the electrons in atoms are termed as valance electron.
3. The ionic bond is not-directional.
4. Ionic compound exist in crystalline form.
5. Covalent compounds have low melting points.
6. All covalent compounds exist as giant aggregates.
7. Covalent bond is formed due to mutual sharing of electrons.
8. Covalent compounds are good conductors of electricity.
Answer:
a)true. b)true c)false d)true e)false f)false g)true h)true
the periodic table has 18 groups and 7
An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. The group number of element X is: 2963Cu+11H 601n+α+211H+X.
what are three ways of measuring the amount of substance?
Answer:
Measure its mass
Measure its volume
Measure its number of moles
Explanation:
I need helpppppppppp, please. What type of radioactive elements does Seabrook Station, New Hampshire's have?
Answer:
NRC: Seabrook nuke plant ran safely in 2020, concrete degradation being monitored. SEABROOK — According to federal experts, annual inspections throughout 2020 show NextEra Energy Seabrook's nuclear power plant again ran safely over the past year.
Explanation:
During a dry year which plants will most likely be able to survive in clay soil
Answer:
trees
Explanation:
Some calcifiers can use bicarbonate (HCO3-) to make their shells. How will they be affected by the decrease in pH
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?The bicarbonate ion is the ion that is designated as HCO3-. We must notice that this ion is present in abundant amounts in the sea. This amount definitely make the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
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When warm air is forced upward
along a cold front, what might
happen?
A. A thunderstorm can form.
B. A hurricane can form.
C. A dry spell occurs.
D. Clear sky appears.
Answer:
A. A thunderstorm can form.
Explanation:
When it meets warmer air a cold front forms and clouds will appear as the warm air rises and then cools. This may lead to heavy rain along the cold front.
What will be the ratio of the mean free path of the air molecules at 80 °c to their mean free path at stp?.
Answer:
1.00
Explanation:
I honestly have no idea. I found this online and apparently it was correct. I thought at first I would use d = RT/(Nₐ * P *π (2r)². Since all values besides T are constant, I thought the ratio would just be (273+80)/273 since 273 is standard temperature in Kelvin. However, I think the answer is 1.00 since the pressure would also increase since it is a rigid container, effectively cancelling out the increase in temperature.
The ratio of the mean free path of air molecules at 80 °C to their mean free path at STP is approximately 0.934.
What is mean free path?The mean free path (MFP) of gas molecules is the average distance they travel between collisions with other molecules. It depends on the temperature, pressure, and molecular size of the gas. The MFP of air molecules at standard temperature and pressure (STP) is about 68 nanometers.
To find the ratio of the mean free path of air molecules at 80 °C to their mean free path at STP, we need to use the following formula:
Ratio = (MFP at 80 °C) / (MFP at STP)
The MFP at 80 °C can be calculated using the kinetic theory of gases, which states that:
MFP = (k × T) / (sqrt(2) × pi × d² × P)
where k is Boltzmann's constant, T is the temperature in Kelvin, d is the molecular diameter, and P is the pressure.
For air molecules, d is about 0.364 nanometers. At 80 °C (353 K), the pressure of air is about 101.3 kPa. Plugging these values into the formula, we get:
MFP at 80 °C = (1.38 × 10⁻²³ J/K ×353 K) / (sqrt(2) × 3.14 ×(0.364 × 10⁻⁹m)² ×101.3 × 10³ Pa)
MFP at 80 °C = 63.5 nanometers
Now we can calculate the ratio:
ratio = (MFP at 80 °C) / (MFP at STP)
ratio = 63.5 nm / 68 nm
ratio ≈ 0.934
Therefore, the ratio of the mean free path of air molecules at 80 °C to their mean free path at STP is approximately 0.934.
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Please Help.
If 40.0 grams of HCI were dissolved in enough water to make a solution with a total volume of 3.0 liters, what would be the molarity of the solution?
Answer:
About 0.37 M.
Explanation:
Recall that molarity is defined by moles of solute over total liters of solution:
[tex]\displaystyle \text{Molarity} = \frac{\text{ mols solute}}{\text{ L soln.}}[/tex]
Determine the amount of moles of HCl in 40.0 grams. The molecular weight of HCl is 36.46 g/mol:
[tex]\displaystyle 40.0\text{ g HCl} \cdot \frac{1\text{ mol HCl}}{36.46\text{ g HCl}} = 1.10\text{ mol HCl}[/tex]
Therefore, the molarity of the 3.0 L solution is:
[tex]\displaystyle\text{Molarity} = \frac{1.10\text{ mol}}{3.0\text{ L}} =0.37\text{ M}[/tex]
In conclusion, the molarity of the solution is about 0.37 M.
Consider the chemical equation. 2nbr3 3naoh right arrow. n2 3nabr 3hobr if there are 40 mol of nbr3 and 48 mol of naoh, what is the excess reactant? n2 nbr3 naoh hobr
Following the equation and the stoichiometry of the reaction, excess reactant.
What is excess reactant?The excess reactant has to do with that reactant that is present in more amount than is required in the reaction.
In this case, we have the reaction; 2NBr3 + 3NaOH ---> N2 + 3NaBr + 3HOBr.
If 2 moles of NBr3 reacts with 3 moles of NaOH
x moles of NBr3 reacts with 48 moles of NaOH
x = 32 moles
Hence, NBr3 is the excess reactant.
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Is water solvent or solute
Answer:
Water is a solvent.
Explanation:
What is solvent? Solvent is substance, ordinarily a liquid, in which other materials dissolve to form a solution.
Scientists used to believe that chemical reactions fueled the sun. Why did this lead them to believe that the sun was very young? What kind of reactions do we now think are responsible for the energy released by the sun?
Answer:
The energy produced by the sun is as a result of nuclear reactions which produces large amounts of energy.
Explanation:
Chemical reactions are reactions which occur as a result of a rearrangement of atoms of elements to form new combinations of substances known as compounds.
Since chemical reactions which have relatively short lifespans, scientist would have assumed that the sun is very young.
However, nuclear reactions have been proven to be the means by which the sun produces its energy.
Nuclear reactions release large amounts of energy and have relatively long lifespans.
Therefore, the energy produced by the sun is as a result of nuclear reactions.
We already know that the Sun emits energy through a process called nuclear fusion. Nuclear fusion can occur when the protons of hydrogen atoms collide in the Sun's core to make helium atoms. This can also be called PP, or proton-proton chain reaction. Our Sun is currently 4.6 billion years old, but early scientists believed the Sun to have been made when a huge cloud of gas and particles (also known as a nebula) collapsed under the force of its own gravity. This is known as the Nebula Theory.
two cartons of milk were opened , one was left by a radiator while the other was placed in the fridge. how will the milk in the two cartons differ after three days ?
Can someone please help me? :(
Answer:
Explanation:
I think the answer is Heart & stomach, but is this really a chemistry question? or Biology? :D
Answer:
A: heart
Explanation:
A muscle cell is also known as a myocyte when referring to either a cardiac muscle cell (cardiomyocyte), or a smooth muscle cell as these are both small cells.
Look at the electrophoresis sample below. Which DNA samples are the
most similar (A-F)? What could these similarities mean?
If Band 8 in Sample F represents the mutated gene that causes baldness,
which other DNA samples may also have the baldness gene?
PLEASE HELP WILL GIVE BRAINLIEST!!
The DNA samples that are the most similar include E and B (only one heterozygous difference).
What's in an electrophoresis gel?An electrophoresis gel is a technique used in molecular biology to separate different alleles obtained by PCR.
According to the picture, B, E and F samples contain the mutated allele that causes baldness.
In conclusion, the DNA samples that are the most similar include E and B (only one heterozygous difference).
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If a substance contains a hydrogen ion concentration of 1.0 x 10-5 M, which types of ions does it contain more of?
A) hydroxyl ions
B) oxygen ions
C) hydroxide ions
D) hydrogen ions
Since the pH of the substance is 5, the substance contains more of hydrogen ions.
What is pH of a solution?The pH of a a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.
[tex]pH = -log[H^{+}][/tex]
A neural solution has pH 7.
A solution with pH below 7 has more hydrogen ions while a solution with pH above 7 has more hydroxide ions.
The pH of a substance contains a hydrogen ion concentration of 1.0 x 10-5 M is 5.
Therefore, the substance contains more of hydrogen ions.
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Would a precipitate form if a solution of calcium acetate were mixed with a solution of sodium phosphate
A mixture of calcium acetate and sodium phosphate would produce [tex]Ca_3(PO_4)_2[/tex] as a precipitate.
Precipitation reactionPrecipitates are insoluble salt formed from the reaction of two soluble salts.
The equation of the reaction between calcium acetate and sodium phosphate is represented by the equation below:
[tex]3Ca(C_2H_3O_2)_2 + 2Na_3PO_4 --- > Ca_3(PO_4)_2 + 6NaC_2H_3O_2[/tex]
The [tex]Ca_3(PO_4)_2[/tex] produced in the reaction is an insoluble salt and, hence, a precipitate.
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If I have 22,9 moles of a gas at a pressure of 12.4 atm and a volume of 24 liters, what is the temperature?
Answer:
160 K, using 2 SF,
Explanation:
Ideal Gas law, rearrange to solve for T (K), answer about 158.3 round to 2SF
PV = nRT
Three elements, x, y, and z, have consecutive increasing atomic numbers. If element x is a noble gas, what will be the symbol for the ion of element z in its compounds?.
Explain why the addition of a catalyst can make a reaction occur that doesn't normally occur at room temperature even when AG<0.
A catalyst can cause a reaction to occur that does not normally happen at room temperature by reducing the activation energy needed to undergo the reaction.
What is a catalyst?Catalysts are substances, often enzymes, used to speed up or commence a chemical reaction. They do this by reducing the necessary energy amount needed to begin the reaction, known as activation energy, or simply by changing the way in which the reaction takes place, which can allow for a reaction to take place even at room temperature when it would otherwise not occur.
Therefore, we can confirm that a catalyst can cause a reaction to occur that does not normally happen at room temperature by reducing the activation energy needed to undergo the reaction.
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What is the total mass of products formed when 50. 0 grams of CH4 is burned with excess oxygen? CH4 + 2 O2 → CO2 + 2 H2O
Halogens are the Group elements. They are highly
reactive and have
in their outer shell. They
become
when they gain an electron from a
metal. The resulting compound is a
Halogens can
also share electrons to form
compounds.
Answer:
Group 17/VIIA
Highly reactive
7 electrons in their outer shell
They become stable and have noble gas configurations when they gain one more electron from metal
Explanation:
halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
Due to their high effective nuclear charge, halogens are highly electronegative. Therefore, they are highly reactive and can gain an electron through reaction with other elements.
Halogens are very reactive because they have seven valence electrons and need one more to have eight valence electrons (an octet). They react with metals and other halogens to get an octet. When this happens, the atoms become stable and have noble gas configurations.
i need four reasons why ph is important!!!
Answer:
I don't know that I have no anwser to that one
What is oxidized and what is reduced in this reaction? cu(s) 2agno3(aq) → cu(no3)2(aq) 2ag(s) cu is reduced and ag is oxidized. ag is reduced and cu is oxidized. no3 is oxidized and cu is reduced. ag is oxidized and no3 is reduced.
From the reaction equation, Cu is oxidized in the reaction while Ag is reduced.
What is a redox reaction?The term redox reaction has to do with a reaction in which a specie is oxidized and another is reduced.
Here the reaction equation is; Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) 2Ag(s) Cu. We can see that Cu is oxidized in the reaction while Ag is reduced.
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Answer:
this is your sign to take a small break and go drink some water
Explanation:
edge 2022
Compare and contrast conduction, convection, and
radiation as part of heat energy
Answer:
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
How many molecules are there in 11.00 moles of carbon dioxide, CO2?
Answer:
Moles= 11/44 = 0.25 molesof CO2. Click to see full answer Considering this, how many moles of carbon are in 1 mole of co2? A mole of CO2molecules (we usually just say “a mole of CO2”) has one moleof carbonatoms and two molesof oxygen atoms.
Exxplanation:
Which term describes this reaction? upper c upper h subscript 3 upper b r (a q) plus upper o upper h superscript minus (a q) right arrow upper c upper h subscript 3 upper o upper h (a q) plus upper b r superscript minus (a q). addition condensation elimination substitution
The reaction is a substitution reaction since bromide ion was replaced by hydroxide ion.
What is a chemical reaction?A chemical reaction is a change which results in a the permanent rearrangements of the atoms and constituents of a substance such that new substances are formed.
The given reaction is a as follows:
[tex]CH_3Br (aq) + OH^{-} (aq) \rightarrow CH_3OH (aq) + Br^{-} (aq) \\ [/tex]
Bromide ion was replaced by hydroxide ion.
Therefore, the reaction is a substitution reaction.
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Answer: D-substitution
Other person is right its
Explanation: