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victus00 [196]
3 years ago
15

Pls answer

Chemistry
1 answer:
Softa [21]3 years ago
6 0

Answer:

a

Explanation:

distance is equal to speed divided by time.

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Which phase change results with increased kinetic energy?
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An increase in kinetic energy corresponds to an increase in temperature. Out of boiling, condensation, freezing, and precipitation, boiling is the only one that indicates an increase in temperature.

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When a calcium atom forms an ion, it loses two electrons. what is the eletrical charge ofbthe calcium ion?
Jobisdone [24]

Answer:

A

Explanation:

because it loses 2 electrons

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What are geometric isomers?
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<span>C. compounds that have the same atoms arranged in the same order, but with different three-dimensional orientations.</span>
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In a solution, the solvent is...
Marina CMI [18]

Answer:

The solvent is the substance that dissolves solutes.

Explanation:

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4 years ago
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It took 55 days for a radioactivity of 1.75 x 1012 Bq to remain 0.135 Ci. What is the half-life of this radioactivity?
Mnenie [13.5K]

From the calculations, the half life of the material is 6.5 days.

<h3>What is radioactivity?</h3>

The term radioactivity has to do with the spontaneous disintegration of a specie.

Uisng the formula;

N=Noe^-kt

N= amount at time t = 0.135 Ci or 4.995 ×10^9 Bq

No = amount initially present =  1.75 x 10^12 Bq

k = rate constant = ?

t = time taken = 55 days

Hence;

4.995 ×10^9  = 1.75 x 10^12e^-55k

4.995 ×10^9/1.75 x 10^12 = e^-55k

2.85 * 10^-3 = e^-55k

ln2.85 * 10^-3 = -55k

k = ln2.85 * 10^-3/-55

k = 0.1066 day-1

Half life = 0.693/ 0.1066 day-1

= 6.5 days

Learn more about radioactivity:brainly.com/question/1770619

#SPJ1

4 0
1 year ago
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