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77julia77 [94]
4 years ago
14

PLEASE HELP I DONT UNDERSTAND A THING

Chemistry
1 answer:
Ymorist [56]4 years ago
6 0

Answer:

I and III

Explanation:

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Which items in this image are electrically conductive? Check all that apply.
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A, the power lines are what actually conducts (Or moves) the power.
It is NOT B or E, because wood is a terrible conductor. This is the reason it is used in homes, to make the heat, (Which is Electricity) stay inside, rather than letting it all pass through.
It is NOT C, because rubber, again, is a horrible conductor. Like wood, it is what we call an insulator, because it does not conduct heat. (or electricity) This is why we wear rubber gloves when doing electrical work.
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3 0
3 years ago
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Which is the BEST evidence that a chemical change has occurred?
MaRussiya [10]

d///////////////////////////////

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4 years ago
Consider the following incomplete reaction. Mg + 2Y ---> MgCl₂ + H₂ Choose the formula for the missing substance Y.
Feliz [49]
It would be:
B. HCl

A metal will react with an acid to form a salt (MgCl2) and H2.
8 0
3 years ago
you do 185 j of work pulling a cart up a ramp. if the ramp does 153 j of work what is the efficient of the ram
egoroff_w [7]
Efficiency of the ram is calculated by dividing the work done by the work or energy that is exerted to do so. This is calculated through the equation,

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Efficiency = 82.7%. 
7 0
4 years ago
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