Unit 2: Chemistry (Not Completed)

Question 1

Where are protons located in the atom?

Answer 1

The nucleus.

Question 2

Where are Neutrons located in the atom?

Answer 2

The nucleus

Question 3

Where are electrons located in the atom?

Answer 3

Around the nucleus

Question 4

What charges do protons have?

Answer 4

Positive charge

Question 5

What charges do Neutrons have?

Answer 5

Neutral charge

Question 6

What charges do electrons have?

Answer 6

Negative charge

Question 7

What is the number of protons for copper?

Answer 7

Copper has 29 protons.

Question 8

Describe the difference between a pure substance and a mixture.

Answer 8

Pure substances contain only one type of particle. Mixtures contain at least two types of particles.

Question 9

Describe the difference between an element and a compound.

Answer 9

Elements are only made up of one type of atom. Compounds are made up of more than one type of atom.

Question 10

Describe the difference between a homogeneous and a heterogeneous mixture.

Answer 10

Homogeneous mixtures look like one substance, heterogeneous mixtures are where the different parts are visible.

Question 11

What is the number of neutrons for copper?

Answer 11

The amount of neutrons in copper is 35.

Question 12

What is the number of electrons in copper?

Answer 12

The number of electrons is 29.

Question 13

Define period as it pertains to the periodic table.

Answer 13

The horizontal rows in the periodic table. Elements show a regular pattern of properties as you move across the table (also known as periodicity).

Question 14

Define Chemical Family.

Answer 14

The vertical columns on the periodic table. The groups of elements with similar properties.

Question 15

What are the four chemical families and what are their group numbers?

Answer 15

1. Alkali Metals: 1
2. Alkaline Earth Metals: 2
3. Halogens: 17
4. Noble Gases: 18

Question 16

What is a chemical change? Give five ways you can tell a chemical change has happened?

Answer 16

A chemical change is where one or more new substances are formed. It includes all chemical reactions and they are usually irreversible.
1. Heat is produced or absorbed
2. Change in colour
3. Gas bubbles form
4. Precipitate forms
5. New odor forms

Question 17

Name two traits of Metals, non-metals, and metalloids.

Answer 17

Metals:
1. Solid at room temperature
2. Shiny appearance
Non-metals:
1. Dull
2. Brittle
Metalloids:
1. Not heat conductors
2. Not malleable

Question 18

Why are chemical symbols used?

Answer 18

To standardize the ‘language of chemistry’ and to identify elements and atoms in a chemical formula easily.

Question 19

Explain the Law of Conservation of Mass.

Answer 19

In a chemical change, the total mass of the new substances is always the same as the total mass of the original substances.

Question 20

Explain the Law of Definite Proportion.

Answer 20

A chemical compound will always have the same proportions or amount of each element by weight, no matter what the amount is, or source.

Question 21

What is an Ionic Compound? Name two properties.

Answer 21

Made up of a metal and a nonmetal. A bond forms when the metal transfers an electron to the nonmetal.
1. Forms ions in solution
2. Conducts electricity

Question 22

What is the difference between an exothermic reaction and an exothermic reaction and an endothermic reaction? Give an example of each.

Answer 22

Exothermic reactions form chemical bonds in a reaction, releasing energy. Heat is given off, surroundings get warmer. Ex) Burning of a candle. Endothermic reactions break bonds during a chemical reaction that requires energy. Heat is absorbed, the surroundings feel cold. Ex) Evaporating Liquids.