Polyatomic Ions
Density & Chemical Reactions
Density
Stoich
MORE STOICH
100

How many atoms are in

C6H12O6?

24

100

This change does NOT change the atoms or molecules present:

Physical

100
what is the equation to solve for density?

Density is mass divided by volume

"love your density"

D = m/v

100

Coefficients in a balanced equation indicate how many moles and grams of each molecule are needed for the reaction.

TRUE OR FALSE

True


remember- to convert - you must get to a mole conversion first.

100

How many moles of K2CO3 are in a 150.0 g sample of a compound?

1.085 moles


150.0 g x  ___  1 mole__    =

               grams from table

200
How many oxygen atoms are in 

C6H12O6?

6

200

This type of reaction changes the atoms or molecules present.

Chemical

200

Gold has a density of 19.3 grams per mL.

Solve for density- V = 34 mL  ;   using density from above to solve for mass.

Mass = ?

660 grams

200

If given 12.3 moles of N2H4O3, what is the mass of the sample?

984 g


12.3  x _80g__

           1 mole

200

HO:

If given the number of moles of a substance and asked to convert to grams, you should:

multiply by the mass of 1 mole of that substance

moles  x   __grams__

                 1 mole

300

What is the formula for Ammonium?

 NH4
300

A physical change or a phase change could be melting.

TRUE OR FALSE

TRUE

300

Is the sample above gold?

Yes

300

relating the quantities of different substances in a chemical equation is:

Stoichiometry

300

HO:

What is the mass of a MgBr2 sample if it contains 0.342 moles of the compound?




63.0 g

400

What is the charge for hydroxide?

OH-


-1

400

Water is unique in that the liquid phase is MORE dense than the solid phase.

TRUE OR FALSE

TRUE


ice floats

400
2H2CO3 -->    2C  +  3O2    + 2H2


What type of reaction is this?

Decomposition
400

The limiting reactant is responsible for determining how much product is produced.

True OR False

True

400

HO:


Acids taste:

HO:


sour.

500

What is the name for KClO3

potassium chlorate

500

A phase change where the particles move closer together would be:


freezing


liquid to solid


particles move closer or are more tightly packed

500
In a combustion reaction, what are the products?

carbon dioxide and water


complete is above.

Incomplete forms carbon monoxide

500

The simple, whole-number ratio for the atoms in a molecule is called:

empirical formula

500

HO:

Molarity is:

(what is the formula?)

HO:

moles of solute divided by liters of solution


mol/L

M
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