Quiz Chem React & EQ & Compounds

Which beaker shows clear evidence that a chemical reaction is taking place?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-2

What observation would you look for to tell if a reaction was endothermic?

• a color change

• gas bubbles

• formation of a precipitate

• a decrease in temperature

Tags

NGSS.MS-PS1-4

Based on the equation, what number needs to be placed in the blank to balance the equation?

4Fe + 3O₂ --> ​ (a)   Fe₂O₃

• 2
• 3
• 4
• 6

Tags

NGSS.MS-PS1-5

What observation would lead you to believe this is an example of an exothermic reaction?

Choose 2.

• creates precipitate

• gives off light

• give off heat

• neutralizes acids

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-5

If you saw the chemical equation written below, what would lead you to believe that a chemical reaction occurred?

CH₄ + 2O₂ --> CO₂ + 2H₂O

• the number of oxygen atoms on the reactants side

• there is carbon in the equation

• the formation of water (H2O) on the products side

• it is not a chemical reaction

Tags

NGSS.MS-PS1-2

Match the following chemical equations to their written component.

• carbon dioxide

• CO₂

• sodium chloride

• CO

• dihydrogen monoxide

• H₂O

• carbon monoxide

• NaCl

Tags

NGSS.MS-PS1-1

True or False: Compounds and Mixtures are made up of two or more elements that are chemically combined.

• True

• False

Carbon forms a variety of substances because it has 8 valence electrons making it a very stable atom that readily bonds.

• True

• False

Tags

NGSS.MS-PS1-1

Organize these options into compounds and not compounds.

Groups:

(a) Compounds

,

(b) NOT compounds

• O₂

• NaCl

• CO₂

• N₂

Tags

NGSS.MS-PS1-1

True or False: Water, H2O, contains hydrogen and oxygen. Hydrogen is an explosive gas, while oxygen is a flammable gas. So, water's physical properties will be similar to hydrogen and oxygen.

• True

• False

Tags

NGSS.MS-PS1-1