Answer:
48889 years
Explanation:
Activity of the living sample Ao= 15.2 disintegration per minute
Activity of the cloth A= 8.4 disintegration per minute
Half life of 14C= 5715 years
Time taken for the decay t= the unknown
From;
0.693/5715 = 2.303/t log (15.2/8.4)
1.213 × 10^-4 = 2.303/t log (1.8095)
1.213 × 10^-4 = 0.593/t
t= 0.593/1.213 × 10^-4
t= 4888.7 years
t= 48889 years
Answer:
B)As you go from left to right, reactivity of metals increases. As you go down in a group, reactivity of metals decreases.
Explanation:
reactivity of metals can be explained as how it can easily lose electron, i.e oxidize as well as reaction with non-metals.
There are factors that influence the reactivity of metals such as
1)atomic radius
2)nuclear charge
3)shielding effect
4) The sublevel arrangement of electrons
In the periodic table,the group 1, known as alkali metals, are the most reactive metals
Therefore, as we from left to right, reactivity of metals increases. As we move down in a group, reactivity of metals decreases.
Molar mass CH4 = 16.0 g/mol
* number of moles:
932.3 / 16 => 58.26875 moles
T = 136.2 K
V = 0.560 L
P = ?
R = 0.082
Use the clapeyron equation:
P x V = n x R x T
P x 0.560 = 58.26875 x 0.082 x 136.2
P x 0.560 = 650.76
P = 650.76 / 0.560
P = 1162.07 atm
Answer:
Moreover, increasing use of fossil fuels also causes serious environmental problems. Hence, there is a pressing need to use renewable energy sources like solar energy, wind, tide, biomass and energy from waste material. (i) it reduces the dependence on fossil fuels for energy. (ii) they donot produces pollution.
A 1
B 1
C 1
D 1
All series circuits have only 1 path to go from. Parallel circuits would have more than one.
