Chemical Reactions

The "up arrow" in a chemical reaction indicates_____

• Production of a gas (right side only)

• reversible reaction

• heated

What does the plus+ sign mean in a chemical reaction?

• heated

• production of precipitate

• combines or reacts with

What does the down arrow on the right side only symbolize?

• heated

• production of gas

• production of precipitate

What does the arrow going both ways symbolize?

<----------->

• reversible reaction

• production of gas

• equals or yeilds

What does the triange above the yield sign -------> mean?

• combines

• heated

• production of gas

What does " s, l, g, aq " symbolize?

• solid, liquid, gas, aqueous

• sand, light, ground, aqueous

• silicon, lithium, germanium, aqueous

What is the difference between a physical change and a chemical reaction?

• In a physical change you can get your original substance back again.

• a chemical reaction will only have a color change.

• in a physical change, heat will be involved

In a _______ reaction, new substances are produced, existing bonds are broken, atoms are rearranged, and new more stable bonds are formed.

• physical

• chemical

• metallic

Hydrogen, Nitrogen, Oxygen, fluorine, chlorine, bromine, and iodine are considered_____________.

• metals

• the super seven

• the great seven

The large number in front of a substance in a chemical reaction

is called a(n) ________.

• subscript

• coefficient

• multiple