Chemistry EOC

The smallest part of an element is

• The atom

• The compound

• The periodic table

• None of these

Again looking at the diagram, which is true?

• Oxygen is a compound

• a water molecule is made of two hydrogen atoms and one oxygen atom

• Only one of the examples contains an oxygen atom

• Water is not a compound

Tags

NGSS.MS-PS1-1

What are the signs of a chemical reaction?

• gas production

• cannot easily be reversed

• color change

• odor

• all of the above

Tags

NGSS.MS-PS1-2

Which of these are an example of a chemical reaction?

• metal rusting

• breaking down of food in your digestive system

• photosynthesis

• all of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the substance created by a chemical reaction called?

• reactant

• product

• resultant

• summation

Tags

NGSS.MS-PS1-5

When observing a reaction between two substances, you want to look at

• The product only

• The properties of the ingredients

• The properties of the substance before and after

• None of the above

Tags

NGSS.MS-PS1-2

In which type of chemical reaction is carbon dioxide and water always in

the product?

• Synthesis

• Decomposition

• Single replacement

• Combustion

A chemical equation

• Is a symbolic representation of a chemical reaction

• Is a symbolic representation of a physical change

• Only shows the reactants

• Uses an equal sign = to indicate the result

When a compound breaks down into two or more substances

• It is a decomposition reaction

• It is a combustion reaction

• It is a physical change

• It is a coefficient

Tags

NGSS.MS-PS1-5

One difference between a physical change and a chemical change is

• A chemical change creates a new substance with different chemical properties

• How long they will last

• One will explode and the other will not

• Physical changes cannot be reversed