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mr_godi [17]
3 years ago
15

Which of the following is true of iron? a. It has the highest electrical conductivity of any metal. b. It can exist in many allo

ys, usually with a carbon base. c. It is highly valuable, has symbolic meaning, and widely used. d. It is a durable metal and is commonly used for casting. Please select the best answer from the choices provided A B C D
Physics
2 answers:
melamori03 [73]3 years ago
4 0

Answer: B

It can exist in many alloys, usually with a carbon base

Explanation:

Iron forms many alloys with a carbon base. Steel is an alloy of iron and carbon. There are many different types of steel needed for different applications. Various metals are added to tune the steel to the required properties. For instance, stainless steel contains 10-30% chromium in addition to iron and a low percentage of carbon. Steel remains an extremely versatile alloy used for many different purposes.

Andrew [12]3 years ago
4 0

Answer:

B. It can exist in many alloys, usually with a carbon base.

Explanation:

edge 2020

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Which statement is true about crystal lattice energy?
irinina [24]

The answer is:

It is a measure of the strength of the bonds between ions.

Lattice energy is an estimate of the strength of the bonds formed by ionic compounds.

The first two choices are wrong because it is actually the opposite.

  • As the ion size increases, lattice energy <u>decreases</u>.
  • As charge of ions increases, lattice energy <u>increases</u>

As for the other third option, it is wrong because lattice energy is the energy RELEASED not absorbed.

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4 years ago
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The potential difference across a resistor increases by a factor of 2. How does the current change? (Ohm's law: V = IR) A. It de
Sedaia [141]
The answer is C.

The question says the potential difference is what is changing, which means we're solving for V.

It tells us that potential difference increases by a factor of two, which just means V doubles.

With this info, we can pick some numbers, plug it into Ohms law and see what happens.

Here's an example where I just picked random numbers that are easy to work with:

V=I*R
10=I*5
I=2
Lets increase the potential difference (V) by a factor of two and see what happens to current:
V=I*R
20=I*5 (all I've done is double the potential difference from 10 to 20)
I=4

When we increase V by a factor of 2, I increases by a factor of 2. We went from I=2 to I=4.
We can increase V by factor of 2 again and see:
V=I*R
40=I*5
I=8

Okay, current just increased by a factor of 2 again when we increased the potential difference by a factor of 2.

It's always good to check work with alternate numbers, so here's one more set:
V=I*R
16=I*4
(remember, we know we're solving for V, so I'm just plugging in random numbers for I and R)
I=4
Increase V by factor of 2:
32=I*4
I=8

So, when we increase V (the potential difference) by a factor of 2, I (current) always increases by a factor of 2 as well.

Hope this helps!





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3 years ago
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