Chemistry Chapter 4

Question 1

What type of bonds are in molecules

Answer 1

Only covalent bonds

Question 2

How is molecular weight calculated

Answer 2

Straight from periodic table weight given

Question 3

MOLS FORMULA

Answer 3

N = m/M

Question 4

Gram equivalent weight is calculated by

Answer 4

Molar mass/n

Number of particles produced or consumed per molecule is what n is

Question 5

How are equivalents calculated

Answer 5

Mass of compound/ gram equivalent weight

Question 6

Normality is calculated by

Answer 6

Molarity = normality/n

N is number of protons or electrons produced or consumed

Question 7

Gram equivalent weight of sulphuric acid

Answer 7

49..05

Question 8

Normality of a 2 M Mg(OH)2 solution

Answer 8

4

Question 9

How do you determine what to multiply for normality for acid bases and salts

Answer 9

Acids donate protons so you multiply by how many H there are

Bases you multiply OH there are

Salt we multiply by the metals amount

Question 10

What is noramlity of 120g of CO32- dissolved in 250mL of solution

Answer 10

16N

Question 11

Percent composition formula

Percent composition of chromium in K2Cr2O7

Answer 11

Mass of element/ molar mass * 100

Question 12

How do you calculate empirical formula and molecular formula

40.9% carbon, 4.58% hydrogen and 54.52% oxygen with a molar mass of 264 g per mol

Answer 12

Molecular

Percent of each atom x molar mass /mass of each atom

Multiply to the mount of molecules on the thing

Then simplify to get empirical

C9H12O9
C3H4O3

If just finding empirical , divide percentage number by mass of atom, then use smallest atom side number to reach biggest then multiply it to all the numbers

Question 13

Combination reactions have more reactants or product

Answer 13

Reactants

Question 15

What is a combination reaction?

Answer 15

When there are two or more reactants forming a product

Question 16

In a decomposition reaction, are there more products or reactants

Answer 16

Products

Question 17

What does combustion involve?

Answer 17

Oxidation using oxygen or something, any type of hydrocarbon

Question 18

What are the two products of a combustion reaction?

Answer 18

Carbon dioxide and water

Question 19

Difference between single displacement and double displacement reactions

Answer 19

One atom is replaced with another atom of another element

One element from each reactant is switched with each other to create compounds

Question 20

Acids and bases combine in neutralization reactions to produce what mainly and what on the side

Answer 20

Salt and water on the side

Question 21

Neutralization reactions are a type of what displacement reaction

Answer 21

Double

Question 22

For a decomposition reaction to occur, what must happen to the reactants

Answer 22

There has to be some form of heat, electricity or UV radiation added for the thing to occur

Question 23

How many grams of calcium chloride are needed to prepare 71.7 g of silver chloride according to the following equation

CACL2+ 2AGNO3 = cA( NO3) 2+ 2AGCL

Answer 23

Approximately 27.8 g of CACL2 is needed to make 71.7 AGCL

How do you do this calculation is firstly you use the given quantity of the product and multiply this by the ratio of molar mass of a AgCl , this will cross out the AgCl in the equation. then you’ll multiply the ratio of reactant over product. And lastly, use the ratio of the thing you’re trying to find to find the grams needed. It is basically crossing out units until you figure it out.

Question 24

What is the limiting reagent?

Answer 24

It is one of the reactants that limits the amount of product that can be found in the reaction

Question 25

The remaining reactant after all the limiting reagent is used up is called

Answer 25

Excess reagent

Question 26

How do you figure out what the limiting agent is between two reactants in an equation? How would you then find how much mass of the excess reagent is?

Answer 26

You would use the n=m/M equation. And find out the number of moles of each reactant. The one with the lower moles is the limiting reagent You then minus each other to get the excess amount of moles, and use the same equation to find out the mass of excess reagent

Question 27

What is the equation for percent yield?

Answer 27

It is the actual yield over theoretical yield times 100%

Question 28

What is the percent yield for a reaction in which 28 g of copper is produced by reacting 32.7 g of zinc in access CUSO4 solution

Answer 28

You do the same crossing of molar mass and ratios to get the theoretical yield for copper to be 32. And then you use the forgotten yield divided by the theoretical yield to get the percent yield. 32 is the theoretical yield for copper The percent yield is 87.5%

Question 29

What does - ous and -ide mean for the number of ions charge

Answer 29

2+ is ous 3+ is ic

Question 30

What does adding IDE mean?

Answer 30

Anions with a negative charge of any amount

Question 31

What is the difference between nitrate and nitrate in terms of their suffix?

Answer 31

Nitrate has less oxygen and nitrate has more

Question 32

What does hypo and hyper mean in terms of oxygen on names of molecules?

Answer 32

Hypo with the last oxygen and per would be more oxygen

Question 33

Read the following from lowest to highest amount of oxygen For chlorites

Answer 33

Hypochlorite,chlorite, chlorate, perchlorate

Question 34

If there is a hydrogen before carbonate, what do we call it?

Answer 34

Hydrogen carbonate or bicarbonate

Question 35

What do we call two hydrogen before a phosphate?

Answer 35

Dihydrogen phosphate

Question 36

NH 4+ is

Answer 36

Ammonium

Question 37

Why are ionic compounds good electrolytes? Which compounds are the weakest because they do not form current carrying ions

Answer 37

They dissolve readily in water Non-polar covalent

Question 38

Solids are considered to have a strong electrolyte if it dissociate completely or partially

Answer 38

Completely

Question 40

Is hydrochloric acid a electrolyte and whyO

Answer 40

It is a strong acid, thus it completely ionizes and is a strong electrolyte

Question 41

Is sucrose a good electrolyte

Answer 41

It is a molecular covalent and thus is a non-electrolyte

Question 42

Is MGBR2 a electrolyte

Answer 42

It is an ionic compound so a electrolyte

Question 43

Is CH for a electrolyte?

Answer 43

No, because it’s a covalent molecule only with nonmetals so it does not ionize and is a non-electrolyte

Question 44

Is phosphate a an ion or cat ion and what is the formula?

Answer 44

Anion, PO4 3-

Question 45

Hypo chloride is a cat ion or an ion and what is the formula

Answer 45

An ion CLO-

Question 46

Ammonium is a cat ion or an ion and what is the formula

Answer 46

Cat ion NH 4+

Question 47

Phosphide is a cat ion or an ion with the formula

Answer 47

P3- Anion

Question 48

Bicarbonate formula

Answer 48

HCo3-

Question 49

Nitrite formula

Answer 49

No2-

Question 50

Chromium formula

Answer 50

Cr2+