3 years ago

Which of the following questions is a scientific question?

Chemistry

1 answer:

insens350 [35]3 years ago

4 0

Explanation:

where's the question, please?

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what will the new volume of a 22.4L same of a gas at STP if the pressure remains constant and the temperature is cut in half? A.

In-s [12.5K]

Answer:

$\boxed{\text{C. 11.2 L}}$

Explanation:

The pressure is constant, so we can use Charles' Law to calculate the volume.

$\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}$

Data:

V₁ = 22.4 L; T₁ = 273.15 K

V₂ = ?; T₂ = 136.58 K

Calculations:

$\dfrac{ 22.4}{273.15} = \dfrac{ V_{2}}{136.58}\\\\0.082 00 = \dfrac{ V_{2}}{136.58}\\\\V_{2} =0.082 00 \times 136.58 = \boxed{\textbf{11.2 L}}$

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3 years ago

Balance this chemical equation Cu(OH)2+ HCl --> CuCl2 + H2O

Finger [1]

Answer:

Cu(OH)2 + 2HCl → CuCl2 + 2H2O

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3 years ago

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Select all of the answers that apply. Water _____. has a pH of 0 can dissolve most substances contains dissolved minerals expand

aleksandrvk [35]

Water: *can dissolve most substances * contains dissolved minerals *expands when it freezes

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3 years ago

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A 32.0-g sample of HF is dissolved in water to give 2.0 × 102 mL of solution. The concentration of the solution is:

guajiro [1.7K]

The concentration of the solution is 8 M

calculation

Concentration = moles/volume in liters

step 1: find moles of HF

moles of HF =mass/molar mass

molar mass of HF = 1+ 19 )= 20 g/mol

moles is therefore = 32.0 g/ 20 g/mol= 1.6 moles

Step 2: convert ml to L

volume in liters = 2.0 x 10^2 / 1000 =0.2 l

step 3: find the concentration

concentration = 1.6 mol / 0.2 l = 8 M

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3 years ago

What are the very small particles that make up all matter?

zhenek [66]

The correct answer would be: Atoms

I hope that this helps you!

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4 years ago