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dlinn [17]
2 years ago
12

Which evidence is an indication that a chemical reaction has occured

Chemistry
2 answers:
Norma-Jean [14]2 years ago
4 0

Answer:

color change

Explanation:

Zolol [24]2 years ago
3 0
Answer:

There are three main indications when a chemical reaction occurs.

1. Energy change.

2. Color change.

3. Formation of new substance, which is the most suitable indication of a chemical change.
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Nitrosyl bromide, NOBr, is formed from NO and Br2.
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C ) The rate will triple

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Is this a redox reaction? give evidence (many points plz answer)<br> 2Mg + CO2 → 2MgO + C
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Answer:

\boxed{yeah}

Explanation:

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Does mass change when you add alka seltzer to water??
Gennadij [26K]

Answer & Explanation:

As an Alka-Seltzer tablet dissolves in water, it liberates carbon dioxide. ... This carbon dioxide gas has mass, but since it is a gas it escapes from the container and diffuses into the atmosphere. The loss of mass from the container is measured directly with the analytical balance.

5 0
3 years ago
Read 2 more answers
How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 43.6 grams of sodium hydroxide in
GaryK [48]

Answer is: 25.84  milliliters of sodium metal.

Balanced chemical reaction: 2Na + 2H₂O → 2NaOH + H₂.

d(Na) = 0.97 g/mL; density of sodim.

m(NaOH) = 43.6 g; mass of sodium hydroxide.

n(NaOH) = m(NaOH) ÷ M(NaOH).

n(NaOH) = 43.6 g ÷ 40 g/mol.

n(NaOH) =1.09 mol; amount of sodium hydroxide.

From chemical reaction: n(NaOH) : n(Na) = 2 : 2 (1: 1).

n(Na) = 1.09 mol.

m(Na) = 1.09 mol · 23 g/mol.

m(Na) = 25.07 g; mass of sodium.

V(Na) = m(Na) ÷ d(Na).

V(Na) = 25.07 g ÷ 0.97 g/mL.

V(Na) = 25.84 mL.

7 0
3 years ago
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