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3 years ago

I need help with 32-34 please!

Chemistry

1 answer:

Ludmilka [50]3 years ago

6 0

Okay!!!!!!!!!!!!!!!!!!

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Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and

kiruha [24]

Answer:

The correct answer would be - c. A solid was added to water and the mixture was stirred until the solid was no longer visible

Explanation:

Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.

when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.

When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.

Thus, the correct answer is option C.

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3 years ago

What are some common examples of solids, liquids and gas?

Sonja [21]

Solids- wood, sand, brick, rock

Liquids- water, milk, blood, coffee

Gases- air, helium, nitrogen, hydrogen

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3 years ago

What period of history worsened air and water pollution in the 1800s?

notka56 [123]

Answer:

The Industrial Revolution

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3 years ago

A solid sample of Zinc Hydroxide is added to 0.350 L of 0.500 M aqueous Hydrogen Bromide. The solution that remains is still aci

Iteru [2.4K]

Answer:

6.499 g

Explanation:

One part of the aqueous HBr reacted with Zinc Hydroxide following the reaction:

Zn(OH)₂ + 2HBr → ZnBr₂ + 2H₂O

And the remaining HBr reacted with NaOH:

NaOH + HBr → NaBr + H₂O

First we calculate how many HBr moles remained after reacting with Zn(OH)₂. That number equals the number of NaOH moles used in the titration:

0.500 M * 88.5 mL = 44.25 mmol NaOH = mmol HBr

Now we calculate how many moles of HBr reacted with Zn(OH)₂:

Originally there were (350 mL * 0.500 M) 175 mmol HBr

175 mmol - 44.25 mmol = 130.75 mmol HBr

Then we convert those 130.75 mmoles of HBr to the Zn(OH)₂ moles they reacted with:

130.75 mmol HBr * $\frac{1mmolZn(OH)_{2}}{2mmolHBr}$ = 65.375 mmol Zn(OH)₂.

Finally we convert Zn(OH)₂ moles to grams:

65.375 mmol Zn(OH)₂ * 99.424 mg/mmol = 6499.8 mg Zn(OH)₂

6499.8 mg Zn(OH)₂ / 1000 = 6.499 g

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3 years ago

If the work is 160 J and the displacement is 4 m what is the force? W = Fd *

Nikolay [14]

Answer:

please mark me brainliesf if it is right

40 N.

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3 years ago