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Chemistry

2 answers:

Furkat [3]3 years ago

7 0

Answer:

The answer should be A

Explanation:

sattari [20]3 years ago

7 0

Answer:

Leaving a Copper penny in vinegar until it turns green

Explanation:

the others are physical changes. when copper penny is put in vinegar, a reactive oixde layer is formed which is green in colour. namely, Cu(II) acetate.

The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.

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viktelen [127]

Answer:

1. is exothermic

Explanation:

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3 years ago

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Which scenario involves a reaction that is at equilibrium?

musickatia [10]

Answer:

the amount of products and reactants is constant

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3 years ago

Enter the molecular equation representing aqueous nitric acid and aqueous ammonia reacting. express your answer as a balanced mo

PtichkaEL [24]

Aqueous nitric acid and aqueous ammonia reacts to form ammonium nitrate
HNO₃(aq)+NH₃(aq) = NH₄NO₃(aq)
HNO₃ +NH3 = NH₄ (+) + NO₃ (-)
Therefore the net ionic equation will be;
H⁺(aq) + NH₃ = NH₄⁺ (aq)

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3 years ago

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1. Of 100 animals on a farm, 20% are horses, 15 % are pigs, 30% are cows, and 35% are

ANEK [815]

B. a circle graph

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3 years ago

Let’s assume that you put a balloon into the freezer. Initially,the balloon had 3.0liters of gas at a pressure of 400kPa and was

EastWind [94]

Here, we should use combined gas law which can be derived from combined gas law, “PV=nRT”. Rearranging, we can get PV/T=nR. Then we can set the two states in the problem together to get

P1V1/T1 = P2V2/T2

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3 years ago