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2 years ago

Which of the following demonstrates the role of chemistry in getting ready for

1 answer:

5 0

Hot and cold water can be mixed together to make warm water is the correct statement that shows role of chemistry.

<h3>What demonstrates the role of chemistry?</h3>

Hot and cold water can be mixed together to make warm water is the statement that demonstrates the role of chemistry in getting ready for school in the morning because it describes the features of warm water. It also shows the method of getting warm water from mixing of hot and cold water.

So we can conclude that Hot and cold water can be mixed together to make warm water is the correct statement that shows role of chemistry.

Learn more about mixture here: brainly.com/question/24647756

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A 2.4 L balloon holds 3.7 mol He. If 1.6 mol He are added to the balloon, what is the new volume?

Elanso [62]

For this question, lets apply Avagadro's law
when Pressure and temperature are constant, the volume occupied is directly proportional to the number of moles of gases.
$\frac{V}{n} = k$
where V-volume, n-number of moles and k - constant
Therefore at 2 instances
$\frac{V1}{n1} = \frac{V2}{n2}$
where V1 and n1 are for 1st instance
and V2 and n2 are for 2nd instance
therefore
$\frac{V1}{n1} = \frac{V2}{n2}$
V1 = 2.4 L
n1 = 3.7 mol
n2 = 3.7 + 1.6 = 5.3 mol
since more He moles are added at the 2nd instance its the sum of the moles.
V2 needs to be calculated $\frac{2.4}{3.7} = \frac{V2}{5.3}$
V2 = 2.4 x 5.3 / 3.7
= 3.4 L
Answer is 1st option 3.4 L

6 0

3 years ago

A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test co

BigorU [14]

Answer:

i have no idea

but its b

Explanation:

3 0

3 years ago

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A 10.00 g sample of a soluble barium salt is treated with an excess of sodium sulfate to precipitate 11.21 g BaSO4 (M- 233.4). W

aliina [53]

Answer:

The salt is barium chloride.

Explanation:

$BaX_2++Na_2SO_4\rightarrow BaSO_4+2NaX$

Moles of barium sulfate = $\frac{11.21 g}{233.38 g/mol}=0.0480 mol$

According to reaction, 1 mol of barium sulfate is produced from 1 mol of $BaX_2$ .

Then 0.0480 moles will be produced from:

$\frac{1}{1}\times 0.0480 mol=0.0480 mol$ of $BaX_2$ .

Mass of $BaX_2$ used = 10.00 g

Moles of $BaX_2$ =\frac{10.00 g}{\text{Molar mass}}[/tex]

$0.0480 mol=\frac{10.00}{\text{Molar mass}}$

Molar mass of $BaX_2$ = 208.33 g/mol

The nearest answer to our answer is $BaCl_2=208.2 g/mol$ .

The correct answer barium chloride with molar mass of 208.2 g/mol.

8 0

3 years ago

Calculate the mass of water produced when 2.06 g of butane reacts with excess oxygen.

dem82 [27]

2C4H10 + 13O2 = 8CO2 + 10H2O

1. (2.06g C4H10)/(58.12 g/mol C4H10) = 0.035mol C4H10

2. (0.035molC4H10)(10 mol H2O/2mol C4H10) = 0.177mol H2O

3. (0.177mol H2O)(18.01g/mol H2O) = 3.19g H2O

8 0

3 years ago

7.The _____ theory of matter states that all particles of matter are in constant motion.

SashulF [63]

The kinetic energy theory of matter states that all particles of matter are in constant motion.
Kinetics has to do with some kind of movement, which is why this answer is the only plausible one.

6 0

3 years ago

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