Which of the following is a step that is NOT in the scientific method?

A) making observations

B) formulating hypotheses

C) modifying laws

D) performing experiments

C) modifying laws

Which of the following terms describes what a doctor forms when treating patients prior to ordering medical tests?

A) experiment

B) theory

C) hypothesis

D) law

C) hypothesis

Which hypothesis in this list is NOT testable by science?

A) The earth is a flat disc.

B) Carbon dioxide is a greenhouse gas.

C) The boiling point of water increases with increasing elevation.

D) The conductivity of saltwater increases with increasing concentration.

E) No man is immortal.

E) No man is immortal.

Which of the following hypotheses is testable by using the scientific method?

A) All men are mortal.

B) The best color is blue.

C) No life exists on other planets.

D) All swans are white.

E) Swimming is fun.

D) All swans are white.

A homogeneous mixture is also called a ____________.

A) solution

B) pure substance

C) heterogeneous mixture

D) liquid

A) solution

Italian dressing contains olive oil and vinegar, which will separate out from each other if left to sit. This makes the dressing a:

A) heterogeneous mixture

B) Homogeneous mixture

C) Both (A) and (B)

D) None of the above

A) heterogeneous mixture

Some liquid in a jar can be separated by physical means into two separate liquids, which can then be separated no further. The liquid is a(n):

A) Compound

B) Element

C) Mixture

D) Pure substance

C) Mixture

A human is an example of a(n)

A) element

B) compound

C) homogeneous mixture

D) heterogeneous mixture

D) heterogeneous mixture

Calcium is an example of a(n)

A) element

B) compound

C) homogeneous mixture

D) heterogeneous mixture

A) element

Glucose is an example of a(n)

A) element

B) compound

C) homogeneous mixture

D) heterogeneous mixture

B) compound

Grape juice is an example of a(n)

A) element

B) compound

C) homogeneous mixture

D) heterogeneous mixture

C) homogeneous mixture

Which one of the following is an example of a compound?

A) air

B) water

C) steel

D) iron

B) water

Which one of the following is an example of a homogenous mixture?

A) pure water

B) carbonated soda

C) apple juice

D) pulpy orange juice

C) apple juice

Which one of the following is an example of an element?

A) concrete

B) salt

C) steel

D) iron

D) iron

Which of the following are chemical properties of matter?

A) mass

B) volume

C) density

D) flammability

D) flammability

Which of the following are physical properties of matter?

A) stability

B) reactivity

C) density

D) flammability

C) density

Which of the following is a pure substance that can be broken down into simpler substances by chemical means?

A) element

B) homogeneous mixture

C) solution

D) compound

E) heterogeneous mixture

D) compound

Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means?

A) Homogeneous mixture

B) Chemical compound

C) Chemical element

D) heterogeneous mixture

E) Solution

C) Chemical element

Which one of the following is NOT an example of a physical change?

A) distilling water to remove impurities

B) filtration of sand out of water

C) mixing water and sugar

D) electrolysis of water to form hydrogen and oxygen gas.

D) electrolysis of water to form hydrogen and oxygen gas.

Why is the dissolving of sugar in water a physical change?

A) the chemical composition of the sugar changes

B) the water gets sweeter

C) the sugar changes from the solid state to the aqueous state

D) the water surrounds the sugar molecules

C) the sugar changes from the solid state to the aqueous state