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ivanzaharov [21]
2 years ago
9

Katrina tried to take pictures with her cell phone but discovered that its battery was dead. What happened to the battery?

Chemistry
2 answers:
Aleks04 [339]2 years ago
4 0
C. All the energy stored in the battery had been transformed.
Mandarinka [93]2 years ago
4 0
C. All the energy stored in the battery had been transferred
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5) answer is A
Burka [1]

Answer:

A)  positive; added

Explanation:

Based on the reaction:

2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)

<em>2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.</em>

<em />

That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.

Thus, right answer is:

A)  positive; added

3 0
2 years ago
Please help me with this I need this now
vodka [1.7K]

Answer:

C.

Explanation:

We get it from the food we eat by mixing it with fluids. Also, you can always look up the answer.

Hope this helps! :) Plz mark as brainliest!

7 0
2 years ago
Read 2 more answers
g Determine the empirical formula for a compound that contains C, H and O. It contains 40.92% C, 4.58% H, and 54.50% O by mass.
Lady bird [3.3K]

Answer:

The empirical formula for the compound is C3H4O3

Explanation:

The following data were obtained from the question:

Carbon (C) = 40.92%

Hydrogen (H) = 4.58%

Oxygen (O) = 54.50%

The empirical formula for the compound can be obtained as follow:

C = 40.92%

H = 4.58%

O = 54.50%

Divide by their molar mass

C = 40.92/12 = 3.41

H = 4.58/1 = 4.58

O = 54.50/16 = 3.41

Divide by the smallest i.e 3.41

C = 3.41/3.41 = 1

H = 4.58/3.41 = 1.3

O = 3.41/3.41 = 1

Multiply through by 3 to express in whole number

C = 1 x 3 = 3

H = 1.3 x 3 = 4

O = 1 x 3 = 3

The empirical formula for the compound is C3H4O3

6 0
3 years ago
Which of the following is a chemical change? A. a solution of salt water being diluted as water is added to it B. soil drying as
Kobotan [32]

A chemical change occurs when the identity of a substance is changed. Silver tarnishing is a chemical change because silver and sulfur react to form a new substance, silver sulfide. In the other examples, the substances have not changed their identity and only physical changes have occurred. the correct answer is D

7 0
3 years ago
Read 2 more answers
It takes 12.5mL of a 0.30M HCl solution to neutralize 285mL of NaOH solution.
Leno4ka [110]

Answer:

Molarity NaOH = 0.0263M

Explanation:

Molarity Acid x Volume Acid = Molarity Base x Volume Base

12.5ml x 0.60M = 285ml x M(base)

M(base) = 12.5ml x 0.60M / 285ml = 0.0263M

5 0
3 years ago
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