CHEMISTRY HIGH SCHOOL

Which of the following can be found in an atom's nucleus?A. cells
B. shells
C. electrons
D. protons

Answers

Answer 1
Answer: D. protons

AND NEUTRONS

The atoms in a compound are held together by a chemical bond. The chemical bonds can be either covalent bonds or ionic bonds. Both the bonds are considered very strong bonds. These bonds are mainly formed by sharing of electrons or in the case when one of the elements making the compound donates electron to the other element. The nucleus of each atom attracts to form a strong bond. This property of attraction between the nucleus of the atoms actually helps in forming the chemical bonds. 

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Which is the best example of water regulating an organism’s body temperature?

Answers

the best example is evaporation

Answer

A!! A jogger sweating after a run

Explanation:

Edge

Which factor is MOST important in determining which minerals will form in a rock?A) The size of the rock.
B) The weight of the rock.
C) The hardness of the rock.
D) The composition of the rock.

Answers

The answer for this question is: The factor that is MOST important in determining which minerals will form in a rock D) The composition of the rock. This is because minerals actually exist as different chemical compounds. By knowing the chemical compounds present in a rock, you can find out what type of mineral is present as well. 

Answer:

Its D.

Explanation:

I just took a usatestprep on it and it had the same question.

Measuring how quickly a reactant disappears is one way to measure the ______________of the reaction

Answers

Explanation:

More quickly a reactant will disappear, the more quickly it will result in the formation of products. This means that consumption or disappearance of reactants determines the rate of a reaction because only then products will be formed.

Thus, we can conclude that measuring how quickly a reactant disappears is one way to measure the rate of the reaction.

Measuring how quickly a reactant disappears is one way to measure the rate of the reaction. It is because the rate of reaction for product formation and reactants forming is the same. It came to a point where their reaction attains equilibrium.

When the pressure that a gas exertson a sealed container changes
from atm to 1.80 atm, the
temperature changes from 86.0°C to
30.0°C.

Answers

Answer:

The pressure changes from 2.13 atm to 1.80 atm.

Explanation:

Given data:

Initial pressure = ?

Final pressure = 1.80 atm

Initial temperature = 86.0°C (86.0 + 273 = 359 K)

Final temperature = 30.0°C (30+273 =303 K)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

P₁ = P₂T₁ /T₂

P₁ = 1.80 atm × 359 K / 303 K

P₁ = 646.2 atm. K /303 K

P₁ = 2.13 atm

The pressure changes from 2.13 atm to 1.80 atm.

Answer:

2.13

Explanation:

What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?

Answers

Explanation:

Molarity is defined as the number of moles per liter of solution.

Mathematically,         Molarity = (no. of moles)/(volume of solution in liter)

Since it is given that the molarity of a solution of 14.0 g and volume is 150 mL or 0.15 L.

Whereas number of moles = (mass)/(molar mass)

So, molar mass of NH_(4)Br is 97.94 g/mol.

Thus,      number of moles = (14.0 g)/(97.94 g/mol)

                                            = 0.142 mol

Therefore, calculate the molarity as follows.

              Molarity = (no. of moles)/(volume of solution in liter)  

                             = (0.142 mole)/(0.15 L)

                              = 0.946 mol/L

Hence, we can conclude that molarity of the solution is 0.946 mol/L.

Final answer:

The molarity of the solution is approximately 0.952 M.

Explanation:

To calculate the molarity of the solution, we need to convert the given mass of NH4Br to moles. The molar mass of NH4Br is 97.94 g/mol. So, 14.0 g of NH4Br is equal to 0.143 mol. Next, we convert the given volume of the solution to liters, which is 0.150 L. Finally, we divide the number of moles by the volume in liters to find the molarity.

Molarity (M) = moles/volume (L)

Therefore, the molarity of the solution is approximately 0.952 M.

Learn more about molarity here:

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The molar mass of carbon dioxide (CO2) is 44.01 g/mol. The molar mass of water (H2O) is 18.01 g/mol. A reaction uses 528 g of CO2. How many moles of water are used in this reaction?

Answers

The reaction that results from this is:

H2O + CO2 --> H2CO3

Ratio between water and CO2 is 1:1. So we can say that for every Mole of CO2, we need 1 Mole of water to produce 1 Mole of H2CO3. Thus as n=m/M we can find n = 528/44.01 = 11.997 ~ 12Mol.

Therefore, we need 12 moles of water.

Answer:

12 moles

Explanation:

The reaction will form carbonic acid:

CO₂ + H₂O  ⇒   H₂CO₃

For 528 g of CO₂, the number of moles (n) will be:

n = mass/molar mass

n = 528/44.01

n  = 12 moles of CO₂

The stoichiometry is 1 mol of CO₂ reacts with 1 mol of H₂O, so 12 moles of CO₂ need 12 moles of H₂O.

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