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3 years ago

3. In which states of matter can materials take the shape of their containers?

Chemistry

2 answers:

adell [148]3 years ago

8 0

Answer:

A. liquid and gas

Explanation:

lbvjy [14]3 years ago

4 0

Liquid and gas is the answer

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The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

$Density = \frac{mass}{volume}$

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

7 0

3 years ago

Choose all the answers that apply.

max2010maxim [7]

Answer: has properties similar to other elements in group 18, does not react readily with other elements, is part of the noble gas group

Explanation: I’ve done on edg before

6 0

3 years ago

The number 0.00003007 expressed in exponential notation is

antiseptic1488 [7]

The exponential is 3.007 times 10 to the -5

5 0

3 years ago

Evaluate this statement: Substances are made of two or more types of elements.

wolverine [178]

A MOLECULE IS MADE OF TWO OR MORE ELEMENTS CHEMICALLY COMBINED IS KNOWN AS A COMPUND.

A MOLECULE IS MADE OF TWO ATOMS IS JUST AN ELEMENT.

A MOLECULE MADE OF TWO OR MORE ELEMENTS IS KNOWN AS A COMPUND.

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3 years ago

Which statement describes how chemical formula such as H20 represent compounds check all that apply

Allisa [31]

<h3>Answer:</h3>

They show the elements of make up a compound
They show the types of atoms that make up a molecule
They show the number of each type of atom in a molecule

<h3>Explanation:</h3>

To answer this question we need to know what is a compound.

A compound is a substance that is made by two or more atoms of different elements that are chemically combined.
A chemical formula of a compound is a formula that shows the elements that make up a compound and also the types of atoms that make up the molecule.
Additionally, the chemical formula shows the number of each type of atom in a molecule.
In this case, the chemical formula of a molecule of H₂O shows that it is made up of one hydrogen atom and two oxygen atoms.

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3 years ago