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katovenus [111]
2 years ago
13

10

Chemistry
1 answer:
DiKsa [7]2 years ago
6 0
I believe it is a large mass of warm air rises, replacing the cooler air above
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Aqueous solutions of lead nitrate and potassium iodide are combined in a test tube. The best proof that a chemical reactions has
tankabanditka [31]

C) A yellow precipitate settles to the bottom.

Explanation:

Lead nitrate is reacting with potassium iodide to form lead iodide, which is a yellow precipitate, and potassium nitrate.

Pb(NO₃)₂ (aq) + KI (aq) → PbI₂ (s) + KNO₃ (aq)

where:

(aq) - aqueous

(s) - solid

A) The solution is yellow.

False, the solution is colorless while the PbI₂ precipitate is yellow.

B) Both reactants are aqueous solutions.

True, however this is not a proof that the chemical reaction occurred.

C) A yellow precipitate settles to the bottom.

True and this is a proof that the chemical reaction occurred because of the formation of PbI₂ yellow precipitate.

D) Lead and potassium are both metals and will replace each other.

True, but this is not a proof that the chemical reaction occurred.

Learn more about:

types of chemical reactions

brainly.com/question/14107139

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7 0
3 years ago
Name two ways in which carbon dioxide is added to the troposphere.
Vedmedyk [2.9K]

Answer:

Carbon dioxide is added to the atmosphere through cellular respiration and the combustion of fossil fuels

Explanation:

3 0
3 years ago
How many kilojoules of heat are required to heat 2550 grams of water from 17.5°C to 100.0°C?
Brut [27]

Answer:

800.209

Explanation:

3 0
3 years ago
u are given a 30.0g sample of radioactive uranium that has a half-life of 12 hours. How much uranium will be left after 2 days?
masya89 [10]
<h3>Answer:</h3>

1.88 g

<h3>Explanation:</h3>

<u>We are given;</u>

  • Mass of a radioactive sample of Uranium as 30.0 g
  • Half life of Uranium sample is 12 hours
  • Time is 2 days

We are required to determine the amount of uranium left after 2 days

  • We are going to use the formula;

N = N₀ × 0.5^n

Where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.

n = (2 × 24) ÷ 12 hours

  = 4

Therefore;

Remaining mass, N = 30.0 g × 0.5^4

                                = 1.875 g

                                = 1.88 g

Therefore, the mass of the remaining sample after decay is 1.88 g

7 0
3 years ago
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What do harmful bacteria do in the gut microbiome
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Answer: The thing that harmful bacteria does in the gut microbiome are the pathogens because it will make the pathogens have a nasty effect on the human body.

Explanation:

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3 years ago
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