Answer:
D
Explanation:carbon dioxide plz mark brainliest
Metals that are higher in the activity series are more reactive than metals that are lower in the activity series.
<h3>Reactivity of metals</h3>
The reactivity of metals is determined by the position of the metals in the activity series of metals. Metals that are more reactive are found at the top of the series while metals that are less reactive are found at the bottom of the series.
In each case, the more reactive metal is as follows;
- Iron is more reactive
- Hydrogen is more reactive
- Zinc is more reactive
- Magnesium is more reactive
- Zinc is more reactive
- Iron is more reactive
Learn more about reactivity series of metals:brainly.com/question/24866635
For this problem we can use half-life formula and radioactive decay formula.
Half-life formula,
t1/2 = ln 2 / λ
where, t1/2 is half-life and λ is radioactive decay constant.
t1/2 = 8.04 days
Hence,
8.04 days = ln 2 / λ
λ = ln 2 / 8.04 days
Radioactive decay law,
Nt = No e∧(-λt)
where, Nt is amount of compound at t time, No is amount of compound at t = 0 time, t is time taken to decay and λ is radioactive decay constant.
Nt = ?
No = 1.53 mg
λ = ln 2 / 8.04 days = 0.693 / 8.04 days
t = 13.0 days
By substituting,
Nt = 1.53 mg e∧((-0.693/8.04 days) x 13.0 days))
Nt = 0.4989 mg = 0.0.499 mg
Hence, mass of remaining sample after 13.0 days = 0.499 mg
The answer is "e"
Answer:
The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy
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