Atoms in Chemical Reactions

A chemical change is when...

• matter changes shape.

• matter changes composition.

• matter changes from one state to another.

• matter gets ground into a powder.

Answer explanation

A change in composition means a change in what matter is made of and how the atoms are bonded together.

For example: burning a piece of wood changes the cellulose that wood is made of into carbon dioxide and other gasses and ashes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Combustion is...

• When something dissolves in water

• When something doesn't dissolve in water

• When something is burned

• When something is metabolized

Tags

NGSS.MS-PS1-5

Oxygen is required for matter to burn.

• True

• False

What is some evidence that a chemical reaction has happened?

• bubbles

• color change

• precipitate formation

• all of the above

Tags

NGSS.MS-PS1-2

Check all of the examples of chemical reactions:

• eating cereal

• writing with a pencil

• a rusting bicycle chain

• breathing some fresh air

• cutting out paper hearts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2H₂ + O₂ → 2H₂O

What are the hydrogen and oxygen molecules in this equation?

• reactants

• products

• lefties

• righties

Tags

NGSS.MS-PS1-2

How many hydrogen atoms are in a water molecule, H₂O?

• 1

• 2

• 4

• 16

Tags

NGSS.MS-PS1-1

Vinegar is an acid found in salad dressing and hot sauce.

• True

• False

Pizza dough rises because...

• we knead it.

• we added oil and warm water.

• yeast reacts and forms carbon.

• yeast reacts and forms carbon dioxide.

Tags

NGSS.MS-PS1-2

What would you expect to see if a product from a reaction is carbon dioxide?

• a color change

• bubbles

• a fire

• a solid that doesn't dissolve in the mixture.

Tags

NGSS.MS-PS1-2