問題一覧
1
force that hold atoms together in a compound
2
covalent bonds form between non-metals by sharing electrons,create molecues
3
when one atom gains electrons and became negative ion,another atom loses electrons and became positive ion.
4
The opposite charges on there ions create a strong electrostatic attraction that holds them together.
5
Diatomic molecules have two atoms. they are unstable non-metal.
6
solid,liquid,solid
7
form crystalline solid
8
2,8,7
9
increse reactivity
10
darker
11
unreactive
12
g/cm^3
13
water+carbondioxide->oxygen+glucose
14
slide B contain chloriphyll to photosynthesis.
15
a.microtubules b.cell wall c.chloroplasts
16
Because it contains chlorophyll.
17
it absorb light as much as possible.
18
oxygen,carbondioxide
19
Density
20
low melting and boiling points
21
high melting and boiling points.
22
Root hair cells-root-stem(xylem)-leaf(xylem)-stomata
23
The cell loses water and became flaccid
24
The water enter the cells and became turgid
25
protein
26
chorophyll
27
Helps plant’s development
28
transmit energy
29
respiration
30
An electrical circuit consists of a power sources,wires,switches and lamps.
31
a circuit that connects an electrical source with its components one after another,forming a single loop.
32
a circuit that has more than one path for the electric current to flow.
33
V/I
問題一覧
1
force that hold atoms together in a compound
2
covalent bonds form between non-metals by sharing electrons,create molecues
3
when one atom gains electrons and became negative ion,another atom loses electrons and became positive ion.
4
The opposite charges on there ions create a strong electrostatic attraction that holds them together.
5
Diatomic molecules have two atoms. they are unstable non-metal.
6
solid,liquid,solid
7
form crystalline solid
8
2,8,7
9
increse reactivity
10
darker
11
unreactive
12
g/cm^3
13
water+carbondioxide->oxygen+glucose
14
slide B contain chloriphyll to photosynthesis.
15
a.microtubules b.cell wall c.chloroplasts
16
Because it contains chlorophyll.
17
it absorb light as much as possible.
18
oxygen,carbondioxide
19
Density
20
low melting and boiling points
21
high melting and boiling points.
22
Root hair cells-root-stem(xylem)-leaf(xylem)-stomata
23
The cell loses water and became flaccid
24
The water enter the cells and became turgid
25
protein
26
chorophyll
27
Helps plant’s development
28
transmit energy
29
respiration
30
An electrical circuit consists of a power sources,wires,switches and lamps.
31
a circuit that connects an electrical source with its components one after another,forming a single loop.
32
a circuit that has more than one path for the electric current to flow.
33
V/I