This is because temperatures determine the kinetic energy of molecules of a substance, At lower temperatures the molecules have low kinetic energy hence the distance between molecules is not as large as when the kinetic energy is higher (because the molecules bombard less and with less kinetic energy). This means the substance can pack more molecules per volume at lower temperatures. The more the molecules per volume the higher the density.
Answer:
it sank to the bottom and started dissolving and creating a gas (gas production is a sign that a chemical change is happening)!
Explanation:
As the gas bubbles rose, they carried some of the colored water with them. When the blob of water reached the top, the gas escaped and down went the water.
Answer:
1. H=2, O=1
2. H=4, O=2
3. C=1, O=1
4.
a. reactants C=1, O=2
b. products C=1, O=2
5.
a. reactants H=4, O=2
b. products H=4, O=2
6
a. reactants C=1, O=1, H=4
b. products C=1, O=1, H=4
Answer:
Option C. +150KJ
Explanation:
Data obtained from the question include:
Heat of reactant (Hr) = 200KJ
Heat of product (Hp) = 350KJ
Change in enthalphy (ΔH) =..?
The enthalphy of the reaction can be obtained as follow:
Change in enthalphy (ΔH) = Heat of reactant (Hp) – Heat of reactant (Hr)
ΔH = Hp – Hr
ΔH = 350 – 200
ΔH = +150KJ
Therefore, the enthalphy for the reaction above is +150KJ
The more protons in the nucleus, the stronger the attraction of the nucleus to electrons. This stronger attraction makes it more difficult to remove electrons. Within a group, the ionization energy decreases as the size of the atom gets larger.
