8th Grade Chemistry Review

What is the name of this object?

The active ingredient in TUMS is calcium carbonate, CaCO3, which is an example of a _______ with ______ oxygen atoms.

Ozone is a form of oxygen in which three atoms bond to one another. Ozone is an example of a _______

A.Element

B.Molecule

C.Atom

A chemical change occurs when a loaf of bread cooks. What effect does the chemical change have on the physical properties of the bread?

A. the bread is unchanged c. the egg cannot be measured

B.the bread has new physical properties

C.the bread has doubled in size

D.the bread can not be measured

Bill Nye tried to create and destroy matter after winning a soccer tournament because he was happy. Is it actually possible to create/destroy matter?

When iron rusts what kind of change is it?

A.Chemical Change

B.chemical change and physical change

C.Physical Change

D.Change of attitude

This is used to represent the number of each atom being represented.

A.Exponent

B.Coefficient

C.Molecule

D.Subscript

This appears on the left side of a chemical formula, and represents how many molecules there are.

A.An atom

B.A molecule

C.The subscript

D.The coefficient

In the lab with crushed chalk and vinegar what were the reactants?

In the lab with crushed chalk and vinegar, what were the products?

Cutting an apple in half.

Letting the cut apple sit out and it turns brown.

What type of chemical reaction absorbs energy and requires energy for the reaction to occur? (feels cold)

walking on hot sand feeling it on your feet in the summer, heat transfers from

Any type of reaction that invovles burning (combustion) can be classified as which of the following types of reactions?

Icecream melting on a hot sunny day

sitting down on a cold metal bench, the bench feels cold because

Warmth coming from the burning gel you made in science lab.