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xeze [42]
3 years ago
9

Which of these objects has kinetic energy?

Chemistry
1 answer:
Bingel [31]3 years ago
8 0

Answer:

A

Explanation:

Anything moving I'd using Kinetic Energy

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Write the corresponding word equations for the reactions between;<br> (a) metals and water
Salsk061 [2.6K]

Answer:

M + H2O = MO + H2

Explanation:

When metals react with water they form oxides of the metal and hydrogen gas

7 0
4 years ago
An element's atomic number is 7. How many protons would an atom of this element have?
rusak2 [61]

well the atomic number is 7 the number of protons is also equal to 7 .

hope this helps


8 0
3 years ago
Read 2 more answers
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
fiasKO [112]
<span>carbon + oxygen → carbon dioxide</span>
3 0
3 years ago
What is a substance used to decrease the rate of a chemical reaction
Stels [109]

Answer:

Inhibitor.

Explanation:

  • An inhibitor is a substance that decreases the rate of, or prevents, a chemical reaction.

  • An inhibitor can reduce the effectiveness of a catalyst in a catalyzed reaction
8 0
3 years ago
What are the concentrations of hydronium and hydroxide ions in a solution with pH 2.6?
Deffense [45]

Answer:

The concentrations of hydronium and hydroxide ions in a solution with pH 2.6 are 2.51*10⁻³ and 3.98*10⁻¹² respectively.

Explanation:

pH is a measure of the acidity or alkalinity of an aqueous solution. The pH indicates the concentration of hydrogen ions present in certain solutions. Mathematically it is defined as the opposite of the base 10 logarithm or the negative logarithm of the activity of hydrogen ions, whose equation is

pH= -log [H⁺]

So, being pH= 2.6 and replacing in the definition of pH:

2.6= -log [H⁺]

[H^{+} ]=10^{-2.6}

[H⁺]=2.51*10⁻³

pOH is a measure of the concentration of hydroxide ions (OH⁻). The sum between the pOH and the pH results in 14:

pOH + pH= 14

So, being pH= 2.6:

pOH + 2.6= 14

pOH= 14 - 2.6

pOH= 11.4

The pOH is defined as the negative logarithm of the activity of the hydroxide ions. That is, the concentration of OH⁻ ions:

pOH= - log [OH⁻]

Being pOH= 11.4 and replacing

11.4= -log [OH⁻]

[OH^{-} ]=10^{-11.4}

[OH⁻]= 3.98*10⁻¹²

<u><em>The concentrations of hydronium and hydroxide ions in a solution with pH 2.6 are 2.51*10⁻³ and 3.98*10⁻¹² respectively.</em></u>

6 0
3 years ago
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