Questions
Science
1.1
Katie Cothran
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
1. An atom is electrically neutral, meaning that the number of protons must equal the
number of electrons
2.
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
3. Atomic mass- 238 and 92
4.
a) Atomic number- 8
b) Mass number-9+8=17
5. 111
6. That if the atom belongs to the same element they have the same atomic number and
electrons and the protons correct
7. H- hydrogen he- helium li- lithium b- boron n- nitrogen
8. Mg
9. Sulfur atoms
10.
a) Hydrochloric acid, nitric, sulfuric correct
b) Sodium hydroxide, iron oxide, silion dioxide correct
11.
a) Hydrogen peroxide
b) sugar
c) Water
12. Diagram of molecule of water and lattice of sodium chloride in book
13. Gas, liquid, solid correct
14. Filtration, decanting, sieving, distilisation, magnestism, centrifuging and froth flotation
15. Electron, proton, atom, nucleus and compound
16. K- potassium, NA- sodium, FE- iron, AG- silver correct
17.
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\
18.
A) Made from many similar atoms correct
B) The element iron is the element (fe) and the atom of iron is the actual
atom
C) The molecule is in the water and the compound is the water.
D) 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
19.
A) Mixture
B) Element
C) compound
D) Element
E) Mixture
F) compound
G) mixture
H) compound
I) mixture
J) Element
20. Compound ,lattice, atom, molecule and mixture
21. A glass of cordial is a mixture and can be dilute and strong; there are no definite
proportions
22. Water is a compound because it contains millions of molecules
23.
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
24.
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
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unit 1.1 revision questions_katie