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3 years ago

Instructions: Select the correct answer.

1 answer:

3 0

The answer is going to be C. Although producing at a fast rate, fossil fuel cannot be re-used or recycled. Wind can be re-used, geothermal energy can be re-used, and hydro energy can be re-used.

Hope this Helps! :)

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In chapter 51, Pip, Wemmick, and Jaggers discuss Estella's parentage. What does Jaggers advise Pip to do with this information?

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What’s this story called

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3 years ago

1.25 cm is the same distance as ? 12.5 Km 12.5 mm 12.5 dm 12.5 m

pogonyaev

Answer:

12.5mm

Explanation:

1cm = 10mm

so you need to multiply the 1.25 by 10 to get it in mm.

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3 years ago

What is the name of this molecular compound ? F6I5 PLEASE AND THANK YOU

lawyer [7]

Answer:

Hexaflourine Pentaiodide?

Explanation:

f = flourine (6 = hexa)

i = iodine (5 = penta) + ide

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3 years ago

238,2U --> 234Th + 90

stiv31 [10]

Answer:

$\\_{2}^{4} \alpha$

Explanation:

In this question, we wish to find the missing nuclei for the equation:

$\\_{92}^{238} U\rightarrow _{90}^{234} Th + _{Z}^{A} X$

In order to find the missing species, we need to use the charge and mass balance law. That is, the mass should be conserved: the total mass on the left-hand side with respect to the arrow should be equal to the total mass on the right-hand side with respect to the arrow:

$238 = 234 + A$

Notice from here that:

$A = 238 - 234 = 4$

So far we know that the mass of X is 4. Similarly, we apply the law of charge conservation. The total charge should be conserved:

$92=90+Z$

From here:

$Z = 92-90=2$

We have a particle:

$\\_{2}^{4} X$

Looking at the periodic table, an atom with Z = 2 corresponds to helium. This can also be written as an alpha particle:

$\\_{2}^{4} \alpha$

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2 years ago

Which of the following is a compound machine?

Burka [1]

A compound machine is that which is composed of two or more simple machines. Simple machines come in 6 basic types: (1) wheel and axle, (2) inclined plane, (3) wedge, (4) pulley, (5) screw, and (6) lever. Among the choices given above, the compound machine is the can opener for it is a combination of a wedge and a lever.

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3 years ago