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zimovet [89]
3 years ago
8

Which of the following may indicate that a chemical reaction has occurred?

Chemistry
1 answer:
lianna [129]3 years ago
3 0

Answer:

D, all of the above

Explanation:

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The rate of energy production is referred to as power

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3 years ago
Are roots or plant growth making cracks in concrete chemical or mechanical weathering?
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it is technically biological weathering but mechanical works as well

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3 years ago
For an electron with angular (azimuthal) quantum number ℓ = 2, the magnetic quantum number m can have
Paraphin [41]

Answer:

-2, -1, 0, +1, +2

Explanation:

The quantum numbers describe the quantum state of an electron in an atom. These numbers are symbolized as n, l, m, and s. There are rules for the combination of these numbers. The angular quantum number (ℓ) is related to the magnetic number (<em>m</em>): if ℓ is equal to a number a, thus <em>m</em> can be any integer number between - a and +a.

According to this rule:

If ℓ = 2, thus <em>m</em> can be have a value of an integer between -2 and +2 ⇒ -2, -1, 0, +1, +2

6 0
3 years ago
Enter a chemical equation for HI(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that st
jek_recluse [69]

Answer:

HI (aq) → H⁺ (aq) +  I⁻ (aq)

HI (aq) +  H₂O(l)  → H₃O⁺ (aq) +  I⁻ (aq)

Explanation:

The Arrhenius acid concept indicates that a substance behaves like acid if it produces hydrogen ions H⁺ or hydronium ions H₃O⁺ in water. A substance will be classified as a base if it produces OH⁻  hydroxide ions in water. This way of defining acids and bases works well for aqueous solutions.

When we mix HI (aq) and water, we are increasing [H₃O⁺]

HI (aq) → H⁺ (aq) +  I⁻ (aq)

HI (aq) +  H₂O(l)  → H₃O⁺ (aq) +  I⁻ (aq)

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4 years ago
Who was the first scientist to measure speed as distance over time?
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Galileo was the first scientist to measure speed as distance over time.

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