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alexgriva [62]
3 years ago
8

Which statement is true of a chemical change? (Plato)

Chemistry
2 answers:
MrRa [10]3 years ago
6 0

Answer: i think A

Explanation: if i got it right could you mark me as brainliest

OleMash [197]3 years ago
5 0

Answer:

A

Explanation:

The answer A is the best answer because it contains the most general characteristic of a chemical change.

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The pOH of a solution of KOH is 11.30. What is the [H*] for this solution?​
Sloan [31]

Answer: The concentration of hydrogen ions for this solution is 1.99 \times 10^{-3}.

Explanation:

Given: pOH = 11.30

The relation between pH and pOH is as follows.

pH + pOH = 14

pH + 11.30 = 14

pH = 14 - 11.30

= 2.7

Also, pH is the negative logarithm of concentration of hydrogen ions.

pH = - log [H^{+}]

Substitute the values into above formula as follows.

pH = -log [H^{+}]\\2.7 = -log [H^{+}]\\conc. of H^{+} = 1.99 \times 10^{-3}

Thus, we can conclude that the concentration of hydrogen ions for this solution is 1.99 \times 10^{-3}.

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3 years ago
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Determine the heat energy needed to raise the temperature of 120 grams of ice at -5 to steam at 115°
CaHeK987 [17]

Answer:

Q = 30355.2 J

Explanation:

Given data:

Mass of ice = 120 g

Initial temperature = -5°C

Final temperature = 115°C

Energy required = ?

Solution:

Specific heat capacity of ice is = 2.108 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = m.c. ΔT

ΔT = T2 -T1

ΔT = 115 - (-5°C)

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Q = 120 g × 2.108 j/g.°C × 120 °C

Q = 30355.2 J

5 0
3 years ago
HELP! An atom of vanadium
Zigmanuir [339]

An atom of vanadium (V)  has 23 electrons.

Given :

A vanadium (V) atom with 23 protons and has a net charge of 0.

To find:

The number of electrons in a vanadium atom

Solution:

Number of protons in vanadium atom = 23

The 0 net charge on the atom indicates that the atom has an equal number of protons and electrons which makes it a neutral atom.

Number of electrons in vanadium atom = Number of protons in vanadium atom = 23

An atom of vanadium (V)  has 23 electrons.

Learn more about subatomic particles here:

brainly.com/question/7221719?referrer=searchResults

brainly.com/question/489853?referrer=searchResults

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