Free Printable Unit 2 project

Worksheets

Unit 2 project

Total questions: 25

Worksheet time: 18mins

Name

Class

Date

What is a molecule?

An element

the coefficient in front of a formula

A type of dog

Number of atoms in a formula

What is a compound?

two elements chemically combined

2 different atoms combined

The way a formula is wrote

Chemical change

What is an atom

smallest unit of matter that has all the properties of a given element.

The same thing as an element

True/false: Burning a candle is a chemical change

True

False

Is melting butter for popcorn a chemical or physical change?

chemical

physical

What is an example of a Chemical change?

Ripped paper

boiled egg

cracked egg

sugar in water

A chemical change:

DOES result in a new substance.

DOES NOT result in a new substance.

A physical change:

DOES result in a new substance.

DOES NOT result in a new substance.

Signs of a _______________ change may include a change in smell, color, or temperature.

chemical

physical

10.

Matter can not be created nor destroyed: it can only be

Destroyed a little bit

Invisible

Transformed, changed

None of the above

11.

A chemical reaction is balanced when

both sides have the same elements

Both sides have the same number of atoms

Same subscripts

Same coefficients

12.

The number in front of a compound or element is a

Subscript

Coefficient

Superscript

Charge

13.

The number to the lower side of an element is a

Subscript

Superscript

Coefficient

Charge

14.

How many oxygen atoms are in this chemical formula?

6 oxygen atoms

2 oxygen atoms

3 oxygen atoms

4 oxygen atoms

15.

A chemical equation tells us

the reactants and the products.

the elements that make up the reactants and the products.

the number of atoms that make up the reactants and the products.

All of the above.

16.

Which of the following is an example that includes evidence of a chemical reaction?

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

Sugar that is burned gives off an odor and turns brown and then black.

A tomato is placed into a blender and chopped up into smaller pieces.

17.

Select the pair of words that correctly displays the general FORMAT for writing CHEMICAL EQUATIONS.

products --> reactants

products --> products

reactants --> products

reactants --> reactants

18.

The beginning substance in a chemical reaction is called a?

A. Product

B. Atom

C. Product reaction

D. Reactant

19.

Gas being produced is ___________ of a chemical change

A. Known

B. Evidence

C. Cause

D. True

20.

Production of ____________ is evidence that a chemical change has occurred.

A. Bubbles

B. Air

C. Gas

D. A & C

21.

How many different types of chemical reactions are there?

A. 2

B. 3

C. 4

D. 5

22.

The red numbers in the image below represent ________

subscripts

coefficients

I don't know, and don't want to try

None of the answers are correct

23.

How many Sodium (Na) are in 6NaCl?

24.

The one or two letters used to represent elements

Yield sign

Coefficient

Symbol

Subscript

25.

A physical change is?

It changes the object into something different

Objects or substances undergo a change that does not change their chemical composition

it is just like a chemical reaction

Paper burning

Reset

Unit 2 project

Total questions: 25

Worksheet time: 18mins

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