Chemical Reactions

What is true about chemical reactions?

• They cause new substances to form.

• They often happen when two or more chemical substances combine.

• They can happen anywhere.

• all of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Properties of matter are ____.

• color, texture, size

• anything that you can see, hear, feel, touch, smell, taste, or measure

• length, height, weight

• all of the above

Tags

NGSS.5-PS1-3

What is NOT evidence that a chemical reaction has taken place?

• production of gas

• color change

• production of energy in the form of heat of light

• melting

Tags

NGSS.MS-PS1-2

Which one is an NOT an example of a chemical reaction?

• a piece of paper being cut in half with scissors

• muffins rising due to baking soda and acid producing gas bubbles

• fireworks giving off energy in the form of light

• a candle burning produces energy as light and heat when the wax mixes with oxygen in the air

Tags

NGSS.MS-PS1-2

Rust happens as a result of a chemical reaction. _____ mixes with oxygen in the air to produce rust, a new substance.

• zinc

• aluminum

• iron

• copper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or false? The properties of a substance can change after a chemical reaction.

• true

• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a chemical change?

• water freezes to form ice

• sugar dissolves in water

• gasoline burns in a car engine

• a piece of metal expands when it is heated

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A change in the shape of an object is an example of _________________.

• a chemical change

• energy

• an endothermic change

• a physical change

The force that holds 2 atoms together is called a ________________.

• Chemical Reaction
• Chemical Bond
• Diatomic Chemical
• Glue

Tags

NGSS.HS-PS1-4

Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?

• the pancake mix
• the eggs
• the milk
• the pancakes