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4 years ago

The effort needed when a simple machine is used is best described by which of these statements?

Chemistry

1 answer:

defon4 years ago

7 0

C.The effort force is most often smaller than the force needed without the machine.

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Define Oxidation number. Find the Oxidation number of Carbon in CO2

pentagon [3]

Look here , good luck

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3 years ago

Please help!!!! The question is down below!

jeka57 [31]

The answer is ion A!

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3 years ago

Use stoichiometry to determine how many moles of O2 are needed

STALIN [3.7K]

Answer:

11.25 moles of O₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

C₃H₈ + 5O₂ —> 3CO₂ + 4H₂O

From the balanced equation above,

1 mole of C₃H₈ reacted with 5 moles of O₂.

Finally, we shall determine the number of mole of O₂ needed to react with 2.25 moles of C₃H₈. This can be obtained as follow:

From the balanced equation above,

1 mole of C₃H₈ reacted with 5 moles of O₂.

Therefore, 2.25 moles of C₃H₈ will react with = 2.25 × 5 = 11.25 moles of O₂.

Thus, 11.25 moles of O₂ is needed for the reaction.

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3 years ago

Rock samples, taken from the Moon, contain many of the same minerals as those found on Earth. Why might this be the case?

Feliz [49]

The moon used to be connected with Earth. A meteor hit several billion years ago and split the Earth and Moon apart. This explains why they share the Sam properties.

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3 years ago

Decreasing the volume of a gas would _______________. A. Decrease the temperature. B. Increase the amount liters. C. Decrease th

Mandarinka [93]

Answer:

D. Increase the pressure.

Explanation:

Okay, lets break this down.

So first, lets imagine what decreasing the volume looks like. I like to think of it as squishing a balloon or water bottle. You condense what's inside it. So, with this in mind, lets look at the question.

A. Decrease temperature:

Does this happen when you squeeze something? It gets colder? No, that's not true. So we can eliminate that one.

B. Increase the liters:

Does this happen when you squeeze something? It gets larger? It takes up more space? No, that's not true. So we can eliminate that one.

C. Decrease in moles:

Okay, so moles is just a fancy way of saying "stuff." So does the amount of "stuff" decrease when you squeeze something? No, it just gets closer together. It's denser. So we can eliminate that one.

D. Increase the pressure:

Now we're getting somewhere!! When you squeeze a balloon, the pressure DOES increase because you are condensing the gas inside it. That's why balloons will pop if you squeeze too hard, the pressure is too great and has to escape. So yes, this is your answer.

Answer: D. Increase the pressure

6 0

3 years ago

Read 2 more answers