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3 years ago

EC

Chemistry

1 answer:

REY [17]3 years ago

8 0

Answer:

Explanation:

this is easy its a

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What three things make up atoms?

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Protons,neutrons and electrons.

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Hydrogen is an elemental gas why

d1i1m1o1n [39]

Answer:

hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas

Explanation:

Hydrogen is part of the Noble gas family

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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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3 years ago

Which sample contains more atoms: 3.89 g of nickel or 6.61 g of silver? Defend your answer.

Alenkinab [10]

Nickel contains more atoms

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2 years ago

Why does the velocity of catalyzed reaction reach maximum at certain concentration of enzyme?

OleMash [197]

Answer:

Because the total energy of the enzyme has been used up and actions already complete

Explanation:

Catalyst are substance known to speed up rate of chemical reaction just like taking a short pathway. When velocity of catalyzed reaction reach maximum, at that moment reaction has reach it full potential (there is an equilibrium in reaction). there won't be any changes on further addition, and mostly indicate that Reaction is Complete

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