Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chem Ch. 5 > Ch 7 > Flashcards

Ch 7 Flashcards

0
Q

Definition of chemical change

A

When the chemical composition of the substance does not remain constant when altered.
- results in CHEMICAL REACTION- when a substance undergoes a chemical change and forms a new substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Definition of a physical change

A

When the chemical composition of the substance remains constant when altered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the evidence for a chemical reaction

A
  1. A gas is produced (bubbles)
  2. The formation of a precipitate from 2 aqueous solutions
  3. Change in color
  4. Change in energy ( exothermic- a reaction that releases heat, endothermic- a reaction that absorbs heat)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a chemical equation

A

Formulas and symbols used to describe a chemical reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a reactant

A

The left side of the equation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the products

A

The outcome of the equation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a catalyst

A

A substance that speeds up a reaction without being consumed or permanently altered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the 7 diatomic molecules

A

H2 ,N2, O2, F2, Cl2, Br2, I2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is balancing by inspection

A

The method of placing coefficients while also analyzing each side of an equation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Definition of a coefficient

A

A whole number used in front of a substance to balance a chemical equation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the guidelines for balancing a chemical equation

A
  1. Before placing coefficients in an equation, verify the formula is correct. Note: subscripts of formulas are never changed
  2. Balance each element by placing a coefficient in front of each substance.
    A. Start with most complex formula
    B. Balance polyatomic ions as a single unit
    C. The coefficient in an aq must be whole numbers
  3. After balancing the equation check your equation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the 5 classifications of chemical reactions

A
  1. Combination reaction
  2. Decomposition reaction
  3. Single- replacement reaction
  4. Double- replacement reaction
  5. Neutralization reaction
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define a combination reaction

A

Simpler substances being combined into a more complex compound. Also referred to as a synthesis reaction.

A + Z ➡️AZ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Define a decomposition reaction

A

A single compound is broken down into 2 or more substances.

AZ ➡️ A + Z

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define a single- replacement reaction

A

A more reactive element displaces another element from a compound or aqueous solution.

A + BZ ➡️ AZ + B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Define a double- replacement reaction

A

2 compounds exchange anions.

AX + BZ ➡️ AZ + BX

16
Q

Define a neutralization reaction

A

When an acid and a base react with each other

HX + BOH ➡️ BX + HOH

17
Q

What do you get when you heat (combine) a metal and oxygen gas

A

Metal oxide

18
Q

What do you get when you combine a non metal and a oxygen gas

A

Nonmetal oxide

19
Q

What do you get when you combine a metal and a non metal

A

An ionic compound

20
Q

The decomposition of a metal hydrogen carbonate creates…

A

A metal carbonate, water and carbon dioxide

21
Q

The decomposition of a metal carbonate is

A

A metal oxide and carbon dioxide

22
Q

The decomposition of a oxygen containing compound creates

A

A substance and oxygen gas

23
Q

What is the activity series

A

A sequence of metals arranged according to their ability yo undergo reaction.

Li> K> Ba> Sr> Ca> Na> Mg> Al> Mn> Zn> Fe> Cd> Co> Ni> Sn > Pb > (H)> Cu > Ag> Hg > Au

24
Q

What are active metals

A

Metals that react directly with water at room temperature

Li> K> Ba> Sr > Ca> Na

25
Q

What is the result when a metal and an aqueous salt solution has a single replacement reaction

A

A new metal and salt form. Remember they follow the active series

26
Q

What results when a metal and a aqueous acid solution in a single replacement reaction

A

An aqueous salt and hydrogen gas

27
Q

Whats results when an active metal and water react in a single replacement reaction

A

A metal hydroxide (OH) and hydrogen are produced

28
Q

What is an acid

A

A substance that releases H+ (hydrogen) atoms in water

29
Q

What is a base

A

A substance that releases OH- (hydroxide) ions in water

30
Q

The result of adding an acid and a base is______+_______ and is an example of a ______ reaction

A

Salt and water

Neutralization reaction

Chem Ch. 5 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions