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Yuki888 [10]
3 years ago
8

Using the half-life graph of cobalt-57, choose ALL the statements that are accurate.

Chemistry
1 answer:
Morgarella [4.7K]3 years ago
5 0

Answer: B) The half-life of Co-57 is 10 days

D) After twenty days have elapsed, about 25% of the Co-57 remains.

E) Scientists have an 8 gram sample of Co-57. After thirty days, 1 gram remains.

Explanation:

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Which of the following pairs of compounds have the same empirical formula?
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Answer:

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Explanation:

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have the same number of atoms of each element in the reactants and in the products

Explanation:

<em>The basic principle in balancing a chemical equation would simply be to have the same number of atoms of each element in the reactants and in the products.</em>

<u>A balanced chemical equation is one that has the same number of atoms of each element on the reactant and the product's side of the equation.</u> For example, consider the equation below:

                     H_2 + O_2 --> H_2O

On the reactant's side, there are 2 atoms of H and O while there are 2 atoms of H and 1 atom of O on the product's side. This is an imbalanced equation. In order for it to be balanced, the number of atoms of H and O on the reactant side must be equal to the number of H and O on the product side as below.

                        2H_2 + O_2 --> 2H_2O

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3 years ago
A highly concentrated solution from which dilutions are typically made for laboratory used is called a what?
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A stock solution is the most concentrated
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3 years ago
Which of the following is NOT a characteristic of a compound?
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Answer:

I think it's D

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Explanation:

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3) What are the long-term effects of the Chernobyl disaster? How many people were displaced?
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Explanation:

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