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2 years ago

Which element has a radioactive isotope that is often used to date rocks younger than about 60,000 years?

Chemistry

1 answer:

Vika [28.1K]2 years ago

6 0

Carbon would be the answer. It has a half life of 5,730 years

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If an endothermic reaction occurs in solution, the temperature of the solution will

Ahat [919]

Answer:

increase

Explanation:

because in endothermic reaction heat is absorbed

4 0

3 years ago

In which cell structure does MOST of the process of cellular respiration take place?

ahrayia [7]

Mitochondria are rod-shaped organelles are basically considered the power producers of the cell, it converts oxygen and nutrients into adenosine triphosphate or ATP, which is the chemical energy,also known as "currency" of the cell which powers the metabolic actions of the cell. This process is called aerobic respiration and it is the reason animals breathe oxygen. Cellular repiration happens in the mitochodrion. The 3 phases of cellular respiration are Krebs Cycle, Electron Transport and Glycolysis (Fermentation). Glycolysis takes place in the cytoplasm while the Krebs cycle and electron transport take place in the mitochondria.

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3 years ago

Which is a complex molecule? a. H2 b. Ne c. Co d. H20

eimsori [14]

Explanation:

$h{}^{2} o$

3 0

2 years ago

If the half-life of a radioactive element is 4 days, how long will it take for three- fourths of a sample of the element to deca

Jlenok [28]

Answer:

$\boxed{\text{8 da}}$

Explanation:

The question will be easier to solve if we interpret it as, " How long will it take until one-fourth of a sample of the element remains,?"

The half-life of the element is the time it takes for half of it to decay.

After one half-life, half (50 %) of the original amount will remain.

After a second half-life, half of that amount (25 %) will remain, and so on.

We can construct a table as follows:

$\begin{array}{cccl}\textbf{No. of} & & \textbf{Fraction} & \\\textbf{half-lives} & \textbf{t/da} & \textbf{remaining} & \\1 & 4 & \dfrac{1}{2} & \\\\2 & 8 & \dfrac{1}{4}& \\\\3 & 12 & \dfrac{1}{8}& \\\end{array}$

$\text{We see that 8 da is two half-lives, and the fraction of the element remaining is $\frac{1}{4}$.}\\\text{It takes $\boxed{\textbf{8 da}}$ for three-fourths of the element to decay}$

3 0

3 years ago

In order to model a chemical change in the laboratory, a student wants to select the appropriate measuring apparatus to record t

RoseWind [281]

Answer:

b,c,d

Explanation:

bc i got it right

7 0

2 years ago