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3 years ago

Which of the following elements has the smallest atomic number?

Chemistry

2 answers:

Semenov [28]3 years ago

7 0

Answer:

helium protons and electrons determine the atomic number and helium has the lowest

Aleks04 [339]3 years ago

6 0

Answer:

Helium, which has 2 protons

Explanation:

Helium has the smallest atomic number from the list with 2 protons and is found after H2 (hydrogen) in the periodic table

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Give reasons :

Elza [17]

Ans 1:

Ammonia is not collected over water since it is highly soluble in water

Ans 2:

Ammonia gas is lighter than air and hence collected by the downward displacement of air.

Ans 3:

The carbon dioxide is very cold as it comes out of the extinguisher, so it cools the fuel as well.

Ans 4:

H₂SO₄ is not used in the preparation of carbon dioxide Because the calcium sulphate formed is insoluble in water. So, CO₂ will not form.

Ans 5:

The opening of hard glass test tube is slanted down during laboratory preparation of ammonia gas because Ammonia gas is not collected in the gas jar by upward displacement of air because it is lighter than air

Ans 6:

Magnesium is reactive enough to be combusted and oxidized in a reaction with carbon dioxide:

The magnesium strip burns brightly in the air, but continues to burn in the carbon dioxide environment

-TheUnkownScientist

3 0

3 years ago

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What is the answer, with the correct number of decimal places, for this problem? 4.392 g+ 102.40 g + 2.51 g=

blondinia [14]

The correct answer is C

4 0

4 years ago

Explain why you hear a “whoosh” sound when you open a can containing a carbonated drink. Which gas law applies?

marishachu [46]

The carbon dioxide in the headspace above the liquid is at higher pressure than atmospheric pressure outside the can.

The gas is at a lower volume initially but suddenly has a larger volume available when the can is opened.

The change in pressure as the gas rapidly moves to become dispersed through its new volume causes the "whoosh" sound.

The gas law that applies is Boyle's law.

This above is the exact answer for edgunity

7 0

3 years ago

Read 2 more answers

The following reaction was carried out in a 3.00 L reaction vessel at 1100 K:

Nady [450]

Answer:

$Q=0.840$

Explanation:

Hello,

In this case, since the given undergoing chemical reaction is correctly balanced, the reaction quotient is computed as well as the equilibrium constant but in terms of the given concentrations that are:

$C_{C}=\frac{5.25mol}{3.00L} =1.75M\\C_{H_2O}=\frac{12.2mol}{3.00L} =4.07M\\C_{CO}=\frac{3.90mol}{3.00L}=1.30M\\C_{H_2}=\frac{7.90mol}{3.00L} =2.63M$

In such a way, the reaction quotient turns out:

$Q=\frac{C_{CO}C_{H_2}}{C_{H_2O}}=\frac{1.30M*2.63M}{4.07M}\\ Q=0.840$

Taking into account that carbon is not included since it is solid.

Best regards.

7 0

3 years ago

When bonds between atoms are broken or formed, what is the outcome?

LuckyWell [14K]

Two or more atoms may bond with each other to form a molecule. When two hydrogens and an oxygen share electrons via covalent bonds, a water molecule is formed. Chemical reactions occur when two or more atoms bond together to form molecules or when bonded atoms are broken apart.

8 0

3 years ago

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