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2 years ago

An atom has 18 protons and 8 valence electrons which statement would best identify this element

Chemistry

2 answers:

lorasvet [3.4K]2 years ago

7 0

Argon has 18 protons which identifies the element and is in group Noble Gases which has 8 valence electrons.

fgiga [73]2 years ago

3 0

It would argon because the atomic number is the same as the protons.

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What element does gold identity as

ICE Princess25 [194]

Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

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2 years ago

What food molecules make up lettuse

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Lettuce
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2 years ago

The diagram below shows Earth, four different positions of the Moon, and the direction of incoming sunlight.

Allisa [31]

Answer:

im 99% sure its 2

Explanation:

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2 years ago

A sample of a substance that has a density of 0.844 g/mL has a mass of 0.549 g. Calculate the volume of the sample.

Virty [35]

D = m / V

0.844 = 0.549 / V

V = 0.549 / 0.844

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3 years ago

chemistry student needs of thiophene for an experiment. She has available of a w/w solution of thiophene in carbon tetrachloride

kumpel [21]

The question is incomplete, here is the complete question:

A chemistry student needs 75 g of thiophene foran experiment. He has available 0.50 kg of a 29.3% w/w solution of thiophene in carbon tetrachloride.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

<u>Answer:</u> The mass of solution the student should use is 255.97 grams

<u>Explanation:</u>

We are given:

Mass of thiophene needed = 75 gram

29.3 % w/w thiophene solution

This means that 29.3 grams of thiophene is present in 100 grams of solution

Applying unitary method:

If 29.3 grams of thiophene is present in 100 grams of solution

So, 75 grams of thiophene will be present in = $\frac{100}{29.3}\times 75=255.97g$

Given amount of solution = 0.50 kg = 500 grams (Conversion factor: 1 kg = 1000 g)

Hence, the mass of solution the student should use is 255.97 grams

4 0

2 years ago