Chemistry review answers (SNC 1P)

1. a)  chemical

b)  precipitate

c)  metals

d)  atomic number

e)  ion

f)  nucleus

g)  periodic

2.  a)  false; physical properties

b)  true

c)  false; Ca

d)  true

e)  true

f) false; a neutron is neutral

3.  wood:  solid, flammable

gasoline:  liquid, flammable

baking soda:  white, reacts with acid

4.  a)  hardness

b)  flammable

c)  chemical

d)  soluble

e)  physical

5.  a)  a chemical changes produces a new substance

b)  the formation of frost is a physical change

c)  a new colour indicates a chemical change

d)  the ability to react with an acid is an example of a chemical property

e)  a physical change is a change of state or form

f)  compounds are made up of elements

g)  metals are shiny and good conductors

h)  electrons are negative particles in orbits around the nucleus

i)  the mass number is the number of neutrons and protons

j)  A Bohr-Rutherford diagram shows electrons in orbits

k)  Mendeleev's table organized elements by atomic number and atomic mass

l)  elements in the same family have similar properties

6.  if it is chemical you will see:  bubbles, colour change, a precipitate has formed, heat or light is given off, or it is difficult to reverse

7.  a)  physical

b)  chemical

c)  chemical

d)  chemical

e) physical

f)  chemical

8.  a) Cu - 3; P - 1: O - 4

b)  Na - 1; N - 1; O- 3

c) Mg - 3; O - 6; H - 6

9.  a) in the nucleus

b)  in the nucleus

c) orbiting the nucleus

10.  metals are on the left; non-metals are on the right

11.  chemical, because it changed colour

12.  physical; it simply changed state

14.  smallest part of an element = electron

connection between atoms = bond

number of protons = atomic number (sorry, I forgot this one!)

positive subatomic particle = proton

sum of protons and neutrons = atomic mass number

neutral (uncharged) subatomic particle = neutron

metal + non-metal = ionic bond

non-metal + non-metal = molecular bond

two or more elements bonded together = compound

a mixture of compounds that looks like one substance = solution

a mixture of compounds where the different substances can be seen = mechanical mixture

pg. 246

4. (a) physical

(b) physical

(c) chemical

(d) physical

(e) chemical

16. (a) 1

(b) 3

(c) 4

(d) 6

(e) 7

17. (a) calcium

(b) Group 2, alkaline earth metals

(c) 2+.

(d) 2

22. (a) ionic compound

(b) ionic compound

(c) ionic compound

(d) ionic compound

(e) molecular compound

(f) neither (element)

23. Students’ answers may vary but could include symptoms of mercury poisoning such as impaired speech or memory loss.

48. It would be safer to eat the fish at the bottom of the food chain, as the concentration of pollutants that bioaccumulate and biomagnify would be less than in a fish at the top of the food chain. This way, you would consume a smaller amount of dangerous pollutants such as heavy metals.

57.(a) magnesium bromide

(b) barium nitride

(c) calcium phosphide

(d) aluminum oxide

(e) sodium iodide

(f) calcium chloride

60. You would know that the lemon juice reacted with copper if there were bubbles (gas produced), if the copper changed colour, or if heat was released or absorbed.

68. Students’ answers may vary but could include examples such as chemicals from batteries, lead paint, and motor oil. All three may leach into the water system from landfill, thus polluting the soil, water, and organisms that live in the area.