If you know the answer 15 points a fallow and a

what happens during nuclear fission that causes the release of large amounts of heat energy?

a. a neutron of a radioactive isotope hits the nucleus of another and sticks to it, making this nucleus unstable and causing it to emit more neutrons. each interaction in this chain reaction causes atoms to split.

b. chemical means are used to combine uranium atoms. the combined atoms are then bombarded with neutrons, causing them to physically split apart.

c. atoms of uranium chemically combine with water molecules to become radioactive. as these combined molecules collide, neutrons are released, and they split apart as the bond is broken.

d. nuclei of lighter isotopes of uranium join together to create larger, heavier nuclei that then emit neutrons and split.

answer:

7.5 mol  

step-by-step explanation:

step 1. balanced equation

c₃h₈ + 5o₂ ⟶ 3co₂ + 4h₂o

step 2. calculation:

you want to convert moles of c₃h₈ to moles of co₂

the molar ratio is 3 mol co₂: 1 mol c₃h₈

moles of co₂ = 2.5 mol c₃h₈ × (3 mol co₂/1 mol c₃h₈)

                      = 7.5 mol co₂

the reaction will form 7.5 mol of co₂.

answer:

4.1 mol·l⁻¹

explanation:

you are diluting the solution with water, so you can use the dilution formula

c₁v₁ = c₂v₂     divide each side by v₂

  c₂ = c₁ × v₁/v₂

data:

c₁ = 7.0 mol·l⁻¹; v₁ = 2.5 l

water added = 1.5 l

calculations:

(a) new volume

v₂ = 2.5 l + 1.8 l

      = 4.3 l

(b) new concentration

c₂ = 7.0 × 2.5/4.3

    = 7.0 × 0.581

    = 4.1 mol·l⁻¹

- because there is an inverse relation between altitude and the number of gas molecules striking the outer surface of the bottle (pressure exerted on it).

- therefore, when the bottle is taken to lower altitude, the number of gas molecules striking the outer surface of the bottle increases and so changing its shape..

f=ma

0.25kg.15.5m/s^2

= 3.875n