Chem RxNs

Question 1

DECOMP CARBONATE

Answer 1

Metal oxide and CO2

Question 2

DECOMP HYDROXIDE

Answer 2

Metal oxide and h2O

Question 3

What is COMPLETE COMBUSTION

Answer 3

EXCESS OXYGEN = CO2 AND H2O

Question 4

What is INCOMPLETE COMBUSTION

Answer 4

You can’t balance it (limited oxygen) carbon (suds), carbon monoxide, carbon dioxide, water

Question 5

DECOMP HYDROXIDE

Answer 5

Metal oxide and water

Question 6

DECOMP CHLORATE

Answer 6

Metal chloride and oxygen gas

Question 7

DECOMP OXIDE

Answer 7

Metal and O2

Question 8

Types of Synthesis Reactions (4)

Answer 8

1. A + B = compound
2. MetalO + H2O = base
3. Non-MetO + H2O = oxoacid
4. MO + N-MO = oxosalt

Question 9

metal oxide and water synthesizes to produce?

Answer 9

a base

Question 10

non-metal oxide and water synthesizes to produce?

Answer 10

an oxoacid

Question 11

a non-metal oxide and a metal oxide synthesizes to produce?

Answer 11

an oxosalt

Question 12

how do you know a compound is a base, oxoacid, oxosalt

Answer 12

• Metal Oxide (MO) + H2O = base
• non-MO + H2O = oxoacid
• MO + non-MO = oxosalt

Question 13

What does the law of conservation of mass state?

Answer 13

Mass of reactants = mass of products

This law implies that in a closed system, matter cannot be created or destroyed.

Question 14

What is a skeleton equation?

Answer 14

An equation showing the formulas of the elements/compounds without indicating the number of molecules involved (balanced chem equs do that)

eg. K(s) + O2(g) → K2O(s).

Question 15

What do coefficients in a chemical equation represent?

Answer 15

The number of molecules of each compound present in the reaction

Question 16

Which elements are considered diatomic? (acronym)

Answer 16

HOFBrINCl

Question 17

What is the purpose of balancing chemical equations?

Answer 17

To ensure the number of each atom is the same on both sides of the equation

This upholds the law of conservation of mass.

Question 18

What is the balanced equation for the combustion of methane?

Answer 18

CH4 + 2 O2 → 2 H2O + CO2

Question 19

How do you balance HYDROCARBONS?

Answer 19

Use the fraction technique aka put the oxygen coeff as the same number as the total oxygen on the other side, and write it over 2. then divide EVERYTHING by 2 to balance it all out

Question 20

What are the 2 results that will happen when balancing hydrocarbons

Answer 20

will either balance PERFECTLY, or you have to use the fraction technique

Question 21

What is the evidence if chemical rxns? (4)

Answer 21

Temp change, bubbles form, precipitate forms, colour change

Question 22

Define exothermic and endothermic

Answer 22

Exo = releases outward heat (combustion)
Endo = absorbs hear and cools surroundings (melting ice)

Question 23

What do acids produce when dissolved in water

Answer 23

Hydrogen ions!

Question 24

What do bases produce when dissolved in water?

Answer 24

Hydroxide (OH) ions!

Question 25

Traits of acids? (5)

Answer 25

Sour, water soluable, reacts w/ metals, conducts electricity, corrosive

Question 26

Traits of bases? (5)

Answer 26

Bitter, water soluable, reacts with skin, conducts electricity, slippery

Question 27

List the 3 notable numbers on the pH scale. Why are they notable?

Answer 27

0, 7, 14.
0-6.9 is ACIDIC
7 is neutral
7.1-14 is BASIC

Question 28

Why is ingesting barium sulfate for medical x-ray safe to do?

Answer 28

Barium is insoluble. The internal organs will not absorb or dissolve it.

Question 29

What makes a double displacement reaction have no reaction?

Answer 29

both products are aqueous