Chemical Reaction

Which one of the following is a chemical reaction? (~ the right answer)

• burning a piece of paper

• heating a piece of iron in a Bunsen burner

• boiling water

• adding salt to water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following NEVER occurs during a chemical reaction?

• Molecules are changed to different molecules.

• Atoms are changed to different atoms.

• Atoms are combined to form molecules.

• Molecules are decomposed to atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A catalyst is a substance that changes the: (V the right answer)

• speed of a chemical reaction

• total amount of chemicals formed

• temperature of a chemical reaction

• volume of gas given off in a chemical reaction 

Tags

NGSS.HS-PS1-5

Which of the following is a chemical reaction? (~ the right answer)

• the removal of grease from clothing using carbon tetrachloride

• the use of neon lighting for advertisements

• the bleaching of fabric using hypochlorite

• the removal of nail varnish using acetone

Tags

NGSS.MS-PS1-2

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The smallest number of elements which can form a compound is:

• 1

• 2

• 3

• 4

The rusting of iron is classed as a chemical change because:

• no heat is given out in the process

• the rust has very different properties from those of iron

• the rust cannot be converted back to iron

• the rust only forms when water and air are present

Tags

NGSS.MS-PS1-2

What is the name of the compound that is formed when magnesium burns in air or oxygen?

• magnesium carbonate

• magnesium dioxide

• oxide magnesium

• magnesium oxide

Tags

NGSS.MS-PS1-1

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

• Combustibility

• A salt dissolving in water.

• Density

• A Granny Smith apple is green.

Tags

NGSS.MS-PS1-2

Where does "heat" belong in a chemical equation for an Exothermic Reaction?

• As a reactant.

• As a product.

• As both a reactant and a product.

• Neither a reactant nor a product.

Tags

NGSS.MS-PS1-4