1 year ago

QUESTION 3

Chemistry

1 answer:

goblinko [34]1 year ago

8 0

Answer:

running the reaction in an inert gases

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The contraction of the triceps muscle causes the arm to flex. The contraction of the triceps muscle causes the arm to extend. When added to the force of the biceps contracting it provides extra force to the ball.

The answer is A

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2 years ago

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What is the mass number of an ion with 107 electrons, 158 neutrons, and a 1 charge?

vredina [299]

No of protons=107+1=108
No. Of neutrons=158
Mass no. =166

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3 years ago

A 29.7 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to

Softa [21]

<u>Answer:</u> The mass of iron in the ore is 10.9 g

<u>Explanation:</u>

We are given:

Mass of iron (III) oxide = 15.6 g

We know that:

Molar mass of Iron (III) oxide = 159.69 g/mol

Molar mass of iron atom = 55.85 g/mol

As, all the iron in the ore is converted to iron (III) oxide. So, the mass of iron in iron (III) oxide will be equal to the mass of iron present in the ore.

To calculate the mass of iron in given mass of iron (III) oxide, we apply unitary method:

In 159.69 g of iron (III) oxide, mass of iron present is $(2\times 55.85)=111.7g$

So, in 15.6 g of iron (III) oxide, mass of iron present will be = $\frac{111.7g}{159.69g}\times 15.6g=10.9g$

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2 years ago

How many nickel atoms are contained in a 92.02 mole sample

Vitek1552 [10]

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By definition, and this is what Avogadro's constant tells you, 1 mole of nickel must contain 6.022⋅1023 atoms of nickel.

Explanation:

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bija089 [108]

I would say A. Friction because it is the act of two things rubbing together.

Ex. Trying to make fire

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