When reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.
<h3>What is a chemical reaction?</h3>
A chemical reaction is said to occur when reactants are combined to form products. We must note that the formation of products is evidenced by;
- Appearance of a liquid
- Appearance of a gas
- Appearance of a solid
Hence, when reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.
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Answer:
the answer to number 9 is A.
Explanation:
Answer:
Option C is correct.
t = 1.95 billion years.
Explanation:
Radioactive decay follows a first order reaction kinetics.
On solving the dynamic equation (the differential equation), this is obtained
C(t) = C₀ e⁻ᵏᵗ
C(t) = amount of radioactive material remaining after time t = 37.5%
C₀ = Initial amount of radioactive material = 100%
t = time that has passed = ?
k = decay constant.
For a first order reaction, the decay constant is related to the half life through the relation
k = (In 2)/T
T = half life = 1.38 billion years
k = (In 2)/1.38
k = 0.5023 per billion years.
C(t) = C₀ e⁻ᵏᵗ
0.375 = e⁻ᵏᵗ
e⁻ᵏᵗ = 0.375
In e⁻ᵏᵗ = In 0.375 = -0.981
-kt = -0.981
t = (0.981/0.5023) = 1.95 billion years.
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Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.
<h3>What are tectonic plates?</h3>
Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.
The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.
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