2.0 PAT review

Question 1

What does WHMIS stand for?

Answer 1

WORKPLACE HAZARDOUS MATERIALS INFORMATION SYSTEM

Question 2

What three shapes do Safety Hazard Symbols use? What does each mean?

Answer 2

Triangle: yellow/caution
Diamond: orange/warning
Octagon: red/danger

Question 3

Explain the difference between Physical and chemical property?

Answer 3

Physical is a change in state but not a change in composition like Chemical properties do
Density/luster etc vs reaction with acids ability to burn reaction with water behaviour in air reaction to heat.

Question 4

Physical and chemical change?

Answer 4

Physical change: reversible, cut and tear into tiny pieces, no new substance is formed, melting point, boiling point.

chemical change: impossible to reverse, temp change, colour change, another substance is formed, combustion.

Question 5

Pure substance and mixture?

Answer 5

Pure substance - a substance made of only one kind of matter, which has a unique set of properties. a mixture that you cant see all the properties.

Mixture - a combination of pure substances; unlike a compound, the components of a mixture do not combine chemically and are not always in the same ratio. You are able to see different properties in the mixture.

Question 6

Element and a compound?

Answer 6

Elements - a pure substance that cannot be broken down into other substances; substances made up of only one type of atom

Compounds - a chemical combination of two or more elements in a specific ratio

Question 7

The solution, suspension, colloid and mechanical mixture?

Answer 7

Sol’s -homogeneous mixture; a mixture of two or more pure substances that looks like one substance

Suspension - cloudy mixture in which tiny particles of one substance are held within another and the particles can be separated out

A colloid-cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance

MM - heterogeneous mixture; mixture in which the different substances that make up the mixture are visible

Question 8

What scientist discovered the electron?

Answer 8

JJ. Thomson

Question 9

What scientist discovered the neutron?

Answer 9

Chadwick

Question 10

What scientist believed matter was made up of 4 elements?

Answer 10

Aristotle

Question 11

What scientist believed atoms were like Billiard Balls?

Answer 11

Dalton

Question 12

What scientist developed the Law of Conservation of Mass?

Answer 12

Lavoisier

Question 13

What scientist discovered the nucleus?

Answer 13

Rutherford

Question 14

What scientist atom was a (+) sphere with electrons orbiting around?

Answer 14

Nagaoka

Question 15

What scientist put the electrons on fixed energy levels (shells)?

Answer 15

Bohr

Question 16

Where are the groups, families and periods on the periodic table?

Answer 16

Groups: the horizontal numbers at the top. (1-6)
Family: noble gas, halogen, alkaline metals, alkali metals.
Periods: the vertical numbers on the sides. (1-18)

Question 17

What is potassium Element, Protons, Neutrons, Electrons, Mass Number?

Answer 17

Element: K
Protons: 19
Neutrons: 20
Electrons 19
Mass Number: 39.10

Question 18

For each substance below, indicate the number of each kind of atom present:
a. CH4 b. NH3 c. CH3OH d. O2

Answer 18

1 Carbon, 1 nitrogen 1 carbon 2 oxygen
4 hydrogen 3 hydrogen 4 hydrogen
1 oxygen

Question 19

What kinds of elements form an ionic compound? A molecular compound?

Answer 19

Ionic compounds are made up of metal and non-metal. Molecular is made up of 2 or more non-metals combined.

Question 20

Describe two tests you could perform to decide if a compound is ionic or molecular?

Answer 20

Test its conductivity, see its state of matter at room temperature, boiling point or melting points.

Question 21

For the following compounds, write the formula or chemical name:/8

a) NaCl(s)
b) Li2O(s)
c) magnesium bromide

Answer 21

a) sodium chloride
b) lithium oxide
c) Mg2Br (s)

Question 22

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

Answer 22

In an exothermic reaction, HEAT is given off ( burning wood).
In an endothermic reaction, HEAT is absorbed ( cold pack).

Question 23

What is Combustion?

Answer 23

A chemical reaction occurs when oxygen reacts with a substance to form a new substance and give off energy.

Question 24

What is Corrosion?

Answer 24

slow chemical change that occurs when oxygen in the air reacts with a metal.

Question 25

What is Cellular Respiration?

Answer 25

Chemical reaction that takes place in cells; food (sugar) reacts with oxygen to produce energy, water, and carbon dioxide.

Question 26

List four pieces of evidence that a chemical reaction occurred?

Answer 26

a colour change the formation of an odour the formation of a solid or a gas the release or absorption of heat

Question 27

What are four factors can speed up a chemical reaction?

Answer 27

Catalysts/ enzymes Temperature Surface area Concentrations

Question 28

What is the Law of Conservation of Mass?

Answer 28

Matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants

Question 29

what is a multivalent ionic compound?

Answer 29

1: I 6: VI, 2: II 7: VII 3: III 8: VII 4: IV 9. XI 5: V 10: X

Question 30

What are protons, electrons, neutrons, atomic number, atomic mass?

Answer 30

Protons: atomic number/number at the top. Electrons: atomic number/number at the top. Neutrons: atomic mass - the atomic number. Atomic number: number at the top/protons/electrons. Atomic mass: the number under element.