3 years ago

What is the mass of an atom with seven protons, seven neutrons, and eight electrons?

Chemistry

1 answer:

belka [17]3 years ago

6 0

Answer:

Explanation:

mass number = protons + neutrons

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Even though lead is toxic, lead compounds were used in ancient times as white pigments in cosmetics. What is the percentage of l

Gekata [30.6K]

Answer: The mass percent of lead in lead (IV) carbonate is 63.32 %

Explanation:

The given chemical formula of lead (IV) carbonate is $Pb(CO_3)_2$

To calculate the mass percentage of lead in lead (IV) carbonate, we use the equation:

$\text{Mass percent of lead}=\frac{\text{Mass of lead}}{\text{Mass of lead (IV) carbonate}}\times 100$

Mass of lead = (1 × 207.2) = 207.2 g

Mass of lead (IV) carbonate = [(1 × 207.2) + (2 × 12) + (6 × 16)] = 327.2 g

Putting values in above equation, we get:

$\text{Mass percent of lead}=\frac{207.2g}{327.2g}\times 0100=63.32\%$

Hence, the mass percent of lead in lead (IV) carbonate is 63.32 %

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On a periodic table, element names are represented by:

alina1380 [7]

Answer: Symbols

Explanation:

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3 years ago

Select the correct answer.

ser-zykov [4K]

Answer:

I think the answer would be option d.

hope it helps.

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Select a system in the human body and explain how a breakdown in the digestive system might affect the system you just chose.\

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The circulatory system works with the digestive system. Once the food is digested, the circulatory systems absorb and uses the nutrients in the food. If the digestive system were to break down, the circulatory will not have the nutrients it needs to sufficiently run the body.

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The chemical mixture that composes our atmosphere is called Synopt.

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