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2 years ago

Help please fast as possible I’ll mark you brainlist

Chemistry

1 answer:

Sergeeva-Olga [200]2 years ago

7 0

Answer:

As mass increases the gravitational force increases

Explanation:

Things with mass gain a gravitational force, The bigger they are the more force, for example: the sun is the biggest so it pull us

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The ____________________ Era accounts for most of the history of Earth.

Slav-nsk [51]

Pretty sure it's the Precambrian.

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2 years ago

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Rust is a compound with the formula F e 2 O 3 . Which elements combine to form rust?

DanielleElmas [232]

Remembering the periodic table, Fe is iron and O is oxygen. The elements that combine to create rust are iron and oxygen, with the chemical compound being (Iron)2(Oxygen)3.

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2 years ago

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Can Molecules be made up of more than one type of atom

slega [8]

Answer:

yes

Explanation:

molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance

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2 years ago

A 0.75M solution of CH3OH is prepared in 0.500 kg of water. How many moles of CH3OH are needed?

4vir4ik [10]

Answer:

We need 0.375 mol of CH3OH to prepare the solution

Explanation:

For the problem they give us the following data:

Solution concentration 0,75 M

Mass of Solvent is 0,5Kg

knowing that the density of water is 1g / mL, we find the volume of water:

$d = \frac{g}{mL} \\\\ V= \frac{g}{d} = \frac{500g}{1 \frac{g}{mL} } = 500mL = 0,5 L$

Now, find moles of $CH_{3} OH$ are needed using the molarity equation:

$M = \frac{ moles }{ V (L)} \\\\\\molesCH_{3}OH = M . V(L) = 0,75 M . 0,5 L\\\\molesCH_{3}OH = 0,375 mol$

therefore the solution is prepared using 0.5 L of H2O and 0.375 moles of CH3OH, resulting in a concentration of 0,75M

5 0

3 years ago

I need help with chemistry!!! 20 points

cluponka [151]

Answer:

See explanation

Explanation:

5 0

2 years ago