What must be done before experimenting?

A) predicting an outcome

B) determining the problem

C) make observations

D) all of the above

A chemical with a formula, such as NaCl or H₂0 is

A) an element

B) a compound or pure substance

C) a heterogeneous mixture

D) a homogeneous mixture

In which state of matter are molecules usually closest together?

A) solid

B) liquid

C) gas

D) plasma

What is the difference between an atom and a molecule?

A) atoms are made of two or more molecules

B) molecules are not made of elements

C) molecules are made of two or more atoms

D) molecules are alive

Where do you turn in papers?

A) hand them to Ms. Lowe

B) the basket

C) Ms. Lowe's desk

D) on Ms. Lowe's computer

What should you FIRST do if a chemical spills?

A) put a paper towel on it

B) put as much as you can down the sink

C) tell those around you so they don't touch it

D) get more of the chemical to replace the spill

How can you tell if a substance is a heterogeneous mixture?

A) it will be made of only one chemical formula

B) it cannot be separated into smaller substances

C) it will look consistent

D) it will not be uniform

Which of the following describes a liquid?

A) no shape, no volume

B) shape, but no volume

C) volume, but no shape

D) shape and volume

Pudding is made from sugar, flavorings, milk, and other ingredients. It is consistent throughout. Pudding is

A) an element

B) a pure substance (compound)

C) a homogenous mixture

D) a heterogenous mixture

A chocolate chip cookie would be

A) an element

B) a pure substance (compound)

C) a homogenous mixture

D) a heterogenous mixture