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Zinaida [17]
2 years ago
12

A compass is wrapped in a coil of wire that is connected to a switch and battery. Which statement best explains why the compass

needle turns when the switch is closed?
Chemistry
2 answers:
Blababa [14]2 years ago
5 0
Because there’s no magnetic force
balu736 [363]2 years ago
4 0

Answer:- The compass needle turns when the switch is closed as there is no magnetic field.

Explanations:- The compass needle is wrapped in a coil which is connected to a battery and switch. If the switch is on then a magnetic field is generated in the coil that stops the moment of the compass needle.

When the switch is off then no magnetic field is generated in the coil and the compass needle is free to turn.

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KOH and Ca(OH)2 are Arrhenius bases that increase the concentration of OH- when dissociated in water.

4 0
2 years ago
6th grade science easy
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The answer is B. Luster

3 0
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How many moles of HCl are present in 0.70 L of a 0.33 M HCl solution?
tester [92]

Answer:

0.23 mol

Explanation:

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3 years ago
A student needs to prepare 50.0 mL of a 1.30 M aqueous H2O2 solution. Calculate the volume of 5.0 M H2O2 stock solution that sho
lisov135 [29]

Answer:

13.0mL

Explanation:

So this is a classic M1V1=M2V2 problem, where M is molarity and V is volume and the subsequent numbers represent the two sets of condition (1 being before dilution and 2 being after dilution)

So M1 is going to be 5.0M because it is our initial molarity and V1 is what we are trying to find since we are trying to find how much of initial volume should be diluted.

M2 is 1.30M since it is what molarity is after dilution and M2 is what volume is after dilution which is 50mL.

So M1V1=M2V2 (becomes an algebra problem)

5*V1=1.30*50

V1= 13.0mL

Now this answer should make sense since to dilute something with large molarity to small you only need very few mL than the final volume because you add water to dilute it.

7 0
3 years ago
A tool that changes light Energy<br> into electricity is a
schepotkina [342]

Answer:

Photovoltaic cell or solar cells

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