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3 years ago

Help PLEASEEEE EXTRA POINTS

Chemistry

1 answer:

AysviL [449]3 years ago

7 0

C: Z because it is the only area of land that is darkened.

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The diagram shows an image produced by a lens.

Katarina [22]

Answer:

I think the answer is X if wrong i´m sorry

Explanation:

7 0

3 years ago

Read 2 more answers

MM H2O2 = 34.02 g/mol MM H2O = 18.02 g/mol MM O2 = 32 g/mol

Kaylis [27]

The grams of oxygen that are produced is 228.8 grams

<em>calculation</em>

2H₂O₂ → 2H₂O +O₂

Step 1: use the mole ratio to determine the moles of O₂

from equation above H₂O₂:O₂ is 2:1

therefore the moles of O₂ = 14.3 moles ×1/2 = 7.15 moles

Step 2: find mass of O₂

mass = moles × molar mass

= 7.15 moles × 32 g/mol =228.8 g

3 0

3 years ago

The _______ force between each planet and the Sun keeps the planets in orbit around the Sun.

finlep [7]

Answer:

The <u>Force of Gravity</u> force between each planet and the Sun keeps the planets in orbit around the Sun.

Explanation:

4 0

3 years ago

Explain, in terms of energy changes, why methane is used as a fuel.

Alik [6]

It puts gas in your car

4 0

3 years ago

If 25 mL of a HCl solution of unknown concentration was neutralized with 10 mL of a 0.30 M NaOH solution, what was the original

QveST [7]

Answer:

0.12 M

Explanation:

Step 1: Write the balanced equation

NaOH + HCl ⇒ NaCl + H₂O

Step 2: Calculate the reacting moles of NaOH

10 mL of a 0.30 M NaOH solution react.

$0.010L \times \frac{0.30mol}{L} = 3.0 \times 10^{-3} mol$

Step 3: Calculate the reacting moles of HCl

The molar ratio of NaOH to HCl is 1:1. The reacting moles of HCl are 1/1 × 3.0 × 10⁻³ mol = 3.0 × 10⁻³ mol.

Step 4: Calculate the concentration of HCl

3.0 × 10⁻³ mol of HCl are in 25 mL of solution.

$M = \frac{3.0 \times 10^{-3} mol}{0.025L} = 0.12 M$

5 0

3 years ago