Answer:
18- H
19- D
20-G
21-A
(i think these are the answers)
Explanation:
Answer:
1(a) N = 3
(b) N = 0
(c) N = 5
(d) N = -2
(2) Molecular formula for benzene is C6H6
Explanation:
1(a) N02 1-
N + (2×-2) = -1
N-4 = -1
N = -1+4 = 3
(b) N2
2(N) = 0
N = 0/2 = 0
(c) NO2Cl
N + ( 2×-2) + (-1) = 0
N - 4 - 1 = 0
N - 5 = 0
N = 0+5 = 5
(d) N2H4
2(N) + (4×1) = 0
2N + 4 = 0
2N = 0 - 4 = -4
N = -4/2 = -2
(2) Molcular mass of benzene = 78g/mole = (6×12g of carbon) + (6×1g of hydrogen) = 72+6 = 78g/mole
Therefore, molecular formula for benzene is C6H6
Pure- table salt
Impure- vegetable oil
Given ,
Mass of sample of cobalt = 27 g
density of sample of cobalt = 9g/cm^3
We know that ,
Density = mass of sample/volume of sample
From that relation ,
We can deduce the following as
Volume = mass of sample/density of sample
Hence , required volume of sample of cobalt = 27 g /9 g/cm^3 = 3 cm^3
The volume is
The local concentration of carbon dioxide in the atmosphere increases when rainforest is slashed and burned because there is less vegetation to use CO2 for photosynthesis.
<h3>WHAT IS PHOTOSYNTHESIS:</h3>
- Photosynthesis is the process whereby green plants obtain their food (glucose) using energy from sunlight.
- Green plants in an ecosystem absorb carbon dioxide (CO2) from the atmosphere as one of the reactants of photosynthesis.
Therefore, this means that the local concentration of carbon dioxide in the atmosphere increases when rainforest is slashed and burned because there is less vegetation to use CO2 for photosynthesis.
Learn more about photosynthesis at: brainly.com/question/1388366
