Answer 1:

Correct answer is D.

D = 4

As it is 4NaCl, it means that there are four molecules of sodium chloride so one molecule of sodium chloride contain 1 chlorine atom so 4 molecules contain 4 molecules of chlorine.

Answer 2:

Correct answer is B.

B = law of conservation of mass

As it has the same amount of atoms of each element on both sides of reaction, so it means the mass on the both sides of equation is same or conserved. So, it will obey law of conservation of mass.

Answer 3:

Correct answer is D.

D = 5

This is according to the law of conservation of mass. So, if at the start of reaction we have 5 grams of substrate we will get the 5 grams of product. Because mass remain conserved during a reaction.

Answer 4:

Correct option is C.

C = 3

In the given reaction, there should be 3 molecules of water in product to balance the equation on both sides. So, the correct option is C.

Answer 5:

Correct option is C.

C = oxygen

In the above given options only oxygen is element. All the other are not elements except Oxygen. So, the correct option is C.

Answer 6:

Correct option is D.

D = apple juice

Homogeneous mixture is the mixture that has the same composition through out the mixture. So, in the given options only apple juice is the homogeneous mixture.

Answer 7:

Correct option is B.

B = It is uniform in composition.

The significant properties of a homogeneous mixture is that it has the same chemical composition throughout the mixture. It is uniform in composition. So, option C is correct.

Answer 8:

Correct answer is A.

A = salt

In a solution of salt and water, salt is solute. Solute is the minor component of solution that dissolve in solvent.

Answer 9:

Correct option is B

B = compound

Compound is the substance made of the atoms of different elements combined together in definite proportions. So, the pure substance from the following is B.

Answer 10:

Correct option is A

A = heterogeneous mixtures

The substance that is not uniform in appearance and each part of the mixture contains a combination of different ingredients in different ratios. so this is definitely a heterogeneous mixture.

Answer 11:

Correct option is D.

D = chocolate chip cookies

All of the above are compounds except chocolate chip coolies. Salt, sugar, water are compounds but chocolate chip cookies.

Answer 12:

Correct option is D

D = brewed tea

All of the above are homogeneous mixture except Saline solution. Brewed tea is not a homogeneous mixture but a heterogeneous solution.

Answer 13:

Correct option is B.

B = A compound is a pure substance, but a mixture is not.

The one of the difference between a compound and mixture is a compound is a pure substance, but a mixture is not. So, the correct option is B