chemical reactions (savoia)

List different observations that usually signify a chemical change.

heat, light, bubbles, color change

What does every chemical change involve?

a new substance produced

What is a precipitate? How is it acknowledged in a chemical equation?

a solid - by denoting with (s)

What does the law of conservation of mass state?

Matter is not created or destroyed in a chemical reaction.

Why do chemists use a chemical equation?

to represent reactions, show quantities,+ rearrangement of atoms

List 2 ways you could "read" the arrow in a chemical equation.

yields, produces

What is a chemical equation?

represents a chemical reaction - showing # of atoms, reactants + products

What does a skeleton equation NOT show?

shows chemical formula, but not amounts (i.e. unbalance)

In an equation, what is meant by... (s), (l), (g), (aq)?

solid, liquid, gas, aqueous

What are coefficients?

whole #'s used to balance equations

A balanced equation is one in which each side of the equation has...

equal # of atoms

If a coefficient isn't written, it is understood to be _____.

1

List the 5 general types of reactions.

synthesis, decomposition, combustion, single replacement, and double replacement

What is a single-replacement reaction?

reaction where 1 element substitutes another in a compound

How can you identify a single-replacement reaction?

one lone element + one compound (A+BC)

On the activity series, a reactive metal will replace any metal listed _______ it.

below

What happens to the activity of the halogens as you go down the group (look at the activity series)?

they get less reactive

What is a double-replacement reaction?

where positive + negative ions switch places to form new compounds

What does a balanced chemical equation allow you to determine?

ratios of atoms + molecules

What does the (aq) in a double replacement reaction mean?

aqueous (solution)