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MrMuchimi
3 years ago
12

Does anyone know how to do this?

Chemistry
1 answer:
mr Goodwill [35]3 years ago
4 0

Answer:

this look hard

Explanation:

hmm

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Which statement describes an open circuit? The circuit is incomplete and broken, and the lights in the circuit shine. The circui
SVEN [57.7K]

Answer:

the third option

Explanation:

The circuit is incomplete and broken, and the lights in the circuit do not shine.

An open circuit means an incomplete circuit.

The first option is wrong since the lights do not shine in an open circuit.

The second option is wrong since an open circuit is incomplete.

The fourth option is also wrong since an open circuit is broken or incomplete.

∴ The third option is correct.

8 0
3 years ago
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How many atoms are in KOH?
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Answer:

KOH contains only one K, so a mole of KOH contains one mole of K. How many atoms of K are in 1 mole of KOH? There are 6.022 × 1023 atoms of potassium in every mole of potassium. Since one mole of KOH contains one mole of K, the answer is 6.022×1023 atoms of K.

Explanation:

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3 years ago
PLSS I need all the help I can get
Ostrovityanka [42]

Answer:

1st one

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5 0
3 years ago
3. A student decides to determine the elemental identity of a metal
miss Akunina [59]

Answer:

part (a) was used to calculate the molar mass of the metal M. In part (c) students proposed an experimental test that could be used to determine if MI 2 is an ionic solid, and then explained how the results of the test supported this claim. Students explained why I 2 is solid at room temperature, but Br 2 is a liquid in part (d).  its {c}

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3 years ago
A chemical reaction gives off 2,100 kJ of heat energy. About how many calories is this ?
n200080 [17]

We have to convert 2100 kilojoule into calories.

2100 Kilojoule is equal to 500 Calories.

The chemical reaction gives off 2100 Kilojoule of heat energy which indicates that the reaction is exothermic in nature. Calorie and Kilojoule both are units of energy. We know, 1 calorie=4.2 kilojoule= 4.2 KJ. So 4.2 KJ is equal to 1 Calorie i.e, 4.2 KJ= 1 Calorie. So, to convert KJ to calorie, we have to divide the energy given in KJ by quantity 4.2. Hence, 2100 Kilojoule energy is equal to \frac{1 X 2100}{4.2} Calorie= 500 Calories.



3 0
3 years ago
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