1.
A) Electron is the smallest
B) Protons and neutrons : heaviest particles, approx 1880 times heavier that electron. Neutron
is usually a little heavier than the proton.
C) Proton is positive
D) Electron is negative
E) Neutrons is neutral
F) Electrons spin around the nucleus
G) Electrons and protons
2. An atom is electrically neutral, meaning that the number of protons must equal the number of
electrons
3.
a) Atomic number- the number of protons in an atom
b) Mass number- number of protons and neutrons in an atom
c) Nucleus- heavy core at the center of the atom
4. Atomic mass- 238 and 92
5.
a) Atomic number- 8
b) Mass number-9+8=17
6. 111
7. That if the atom belongs to the same element they have the same atomic number and electrons
and the protons correct
8. H- hydrogen he- helium li- lithium b- boron n- nitrogen
9. Mg
10. Sulfur atoms
11.
a) Hydrochloric acid, nitric, sulfuric correct
b) Sodium hydroxide, iron oxide, silion dioxide correct
12.
a) Hydrogen peroxide
b) sugar
c) Water
13. Diagram of molecule of water and lattice of sodium chloride in book
14. Gas, liquid, solid correct
15. Filtration, decanting, sieving, distilisation, magnestism, centrifuging and froth flotation
16. Electron, proton, atom, nucleus and compound
17. K- potassium, NA- sodium, FE- iron, AG- silver correct
18.
a) The mass number is usually bigger than the atomic number
b) The chemical for iron is Fe
c) Salt is the compound NaCl
d) Most of the atom is empty space
e) A molecule isn’t the same as a lattice correct\
19.
A)
B)
C)
D)
Made from many similar atoms correct
The element iron is the element (fe) and the atom of iron is the actual atom
The molecule is in the water and the compound is the water.
A mixture is when more than two atoms combine together but not chemically
and a compound is when atoms which are chemically combines or joined
together.
E) A molecule is a group of atoms banded together and an atom is particles that
make up matter
20.
A) Mixture
B) Element
C) compound
D) Element
E) Mixture
F) compound
G) mixture
H) compound
I) mixture
J) Element
21. Compound ,lattice, atom, molecule and mixture
22. A glass of cordial is a mixture and can be dilute and strong; there are no definite proportions
23. Water is a compound because it contains millions of molecules
24.
a)
b)
c)
d)
1 Sulfur and 2 oxygen=3 atoms
2 hydrogen and 1 sulfur= 3 atoms
12 carbon, 22 hydrogen, 11 oxygen= 48 atoms
2 hydrogen, 1 sulfur, 4 oxygen= 7 atoms
a)
b)
c)
d)
Protons= 56, neutrons= 26, electrons= 30
Protons= 59, neutrons= 28, electrons= 31
Protons= 64, neutrons= 29, electrons= 35
Protons= 197, neutrons= 79, electrons= 118
25.
26.
Atom
atomic
mass
number
number of number
number
number
of
neutrons
symbol
electrons for the
protons
atom
carbon
6
12
6
6
6
C
sulfur
16
32
16
16
16
S
sodium
11
23
11
12
11
Na
oxygen
8
16
8
8
8
0
fluorine
9
19
9
10
9
F
iodine
53
127
53
74
53
I