CHEMISTRY HIGH SCHOOL

What can be said about the mass of a system when a change of state occurs? A) The mass of the system always increases during a change of state. B) The mass of the system always decreases during a change of state. C) The mass of the system remains constant during a change of state. D) The mass of the system varies depending on the type of change of state.

Answers

Answer 1
Answer:

Answer:

C) The mass of the system remains constant during a change of state.

Explanation:

During a change of state (such as melting, boiling, or condensation), the mass of a closed system remains constant. This principle is based on the law of conservation of mass, which states that mass cannot be created or destroyed; it can only change forms or be transferred between components of the system

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As water is added to a 0.10 M NaCl aqueous solution, the conductivity of the resulting solution
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A biochemist is attempting to replicate a chemical reaction that commonly takes place in cells. During the chemical reaction, starch is broken down into glucose. What will most likely happen if the amount of enzyme that catalyzes this reaction is increased?

A. The reaction will stop.
B. The reaction will slow down.
C. The reaction will speed up.

Answers

C. the reaction will speed up, as the role of a catalyst is to increase the rate of reaction

What is the percent by mass of water in Na2SO4 • 10H2O?

Answers

We determine the percent by mass of water in the compound by dividing the mass of  water by the total mass. The total mass of Na2SO4.10H2O is equal to 322 g. The mass of water is 180 g. 
       
                    percent by mass of water = (180 / 322)*(100 %) = 55.9%

55.92 percent is the correct answer for online chemistry I just took the test!

How many electrons are there in the 2nd principal energy level (n?

Answers

Each principal energy level above the first contains one s orbital and three p orbitals. A set of three p orbitals, called the p sub level, can hold a maximum of six electrons. Therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

Hope this helps!! (If not sorry!)

Cholesterol has a formula of C27H46O. What is the mass in grams of one molecule of cholesterol?

Answers

The mass in grams of one molecule of cholesterol, C27H46O is6.43×10⁻²² g

Avogadro's hypothesis

6.02×10²³ molecules = 1 mole of Cholesterol

But,

1 mole of Cholesterol = 387 g

Thus,

6.02×10²³ molecules = 387 g mole of Cholesterol

How to determine the mass of one molecule

6.02×10²³ molecules = 387 g mole of Cholesterol

1 molecule = 387 / 6.02×10²³

1 molecule = 6.43×10⁻²² g of Cholesterol

Thus, the mass of 1 molecule of cholesterol is 6.43×10⁻²² g

Learn more about Avogadro's number:

brainly.com/question/26141731

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The molar mass of cholesterol = 386.654 g/mol = 387 g/mole

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would you select water or gasoline to try dissolving the following : table sugar, motor oil, rubber from tire marks, adhesive residue from a packing tape

Answers

To know the answer, we determine the polarities of the solvent we have. Water is polar and gasoline is nonpolar. We remember that like dissolves like. Therefore, the answers are:

table sugar = water
motor oil = gasoline
rubber from tire marks = gasoline
adhesive residue from a packing tape = gasoline

Answer:

table sugar: water

motor oil: gasoline

rubber from tire marks: gasoline

adhesive residue from a packing tape: gasoline

Explanation:

Like dissolves like so a polar compound will dissolve in a polar solvent and a non polar compound will dissolve in a non-polar solvent. The intermolecular forces of attraction are responsible for the dissolution of substances in different solvents.  

For example, polar solute exhibit hydrogen bonding and dipole interaction with polar solvents (water). Non-polar solute exhibit London dispersion forces with non-polar solvents(gasoline).

When two balls collide, the momentum of the balls after the collision is explained by?

Answers

Answer:

(m1+m2)v

Explanation:

where m1 is the mass of the first body

m2 is the mass of the second body

v is the velocity
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