Question

1. which of the following is a homogeneous mixture?

a) stainless steel
b) trail mix
c) molten iron
d) water
e) none of the above

1. which of the following items is a mixture?

a) water
b) sugar
c) brass
d) helium
e) none of the above

1. which of the following statements is false?

a) matter may be a pure substance or it may be a mixture.
b) mixtures may be composed of two or more elements, two or more compounds, or a combination of both.
c) a mixture may be either homogeneous or heterogeneous.
d) a pure substance may either be an element or a compound.
e) all of the above statements are true.

1. how would you classify raisin bran?

a) mixture–heterogeneous
b) mixture–homogeneous
c) pure substance–compound
d) pure substance–element
e) none of the above

1. a solution is an example of a (an)

a) pure substance
b) compound
c) homogeneous mixture
d) heterogeneous mixture
e) element

1. which of the following items is a physical property?

a) the combustion of gasoline
b) the odor of spearmint gum
c) the corrosive action of acid rain on granite
d) the tarnishing of a copper statue
e) none of the above

1. which of the following statements about physical and chemical changes is false?

a) phase changes are always physical changes.
b) in a physical change, matter does not change its composition.
c) in a chemical change, matter changes its composition.
d) chemical reactions are chemical changes.
e) all of the above statements are true.

Explanation:

Question 16

• A homogeneous mixture has uniform composition. Stainless steel is an alloy (mixture of metals like iron, chromium, etc.) with uniform properties. Trail mix is heterogeneous (different components visible). Molten iron is a pure substance (element in liquid state). Water is a pure substance (compound). So stainless steel is homogeneous mixture.

• A mixture has two or more substances. Water is a compound (H₂O), sugar is a compound (C₁₂H₂₂O₁₁), helium is an element. Brass is an alloy (mixture of copper and zinc), so it's a mixture.

• Analyze each option: A is true (matter is pure or mixture). B is true (mixtures can have elements, compounds, or both). C is true (mixtures are homogeneous or heterogeneous). D is true (pure substances are elements or compounds). So all are true, so E is the answer (statement "All of the above statements are true" is true, but the question asks which is FALSE—wait, no: the options are about which statement is FALSE. Wait, A: matter can be pure or mixture (true). B: mixtures can be elements, compounds, or both (true, e.g., air has elements (O₂, N₂) and compounds (CO₂)). C: mixtures are homogeneous or heterogeneous (true). D: pure substances are elements or compounds (true). So all statements are true, so E ("All of the above statements are true") is the correct option (since the question is which is FALSE—wait, no: the options are A - E, and E says "All of the above statements are true". So if A - D are true, then E is true, but the question is which statement is FALSE. Wait, maybe I made a mistake. Wait, let's re - check:

• A: Matter may be pure or mixture (correct). B: Mixtures can be two or more elements, two or more compounds, or both (correct, e.g., a mixture of salt (compound) and iron (element)). C: Mixtures are homogeneous or heterogeneous (correct). D: Pure substances are elements or compounds (correct). So all A - D are true, so E is correct (the statement "All of the above statements are true" is true). So the answer is E? Wait, no—the question is "Which of the following statements is FALSE?". So if A - D are true, then E is a true statement, but we need the FALSE one. Wait, maybe I misread. Wait, no—let's check again. Maybe B is wrong? No, mixtures can have elements (like a mixture of iron and copper) or compounds (like a mixture of salt and sugar) or both (like a mixture of iron and salt). So B is correct. So all A - D are true, so E is the correct option (since the statement "All of the above statements are true" is true, so there is no false statement among A - D, so E is the answer).

Answer:

A) stainless steel

Question 17