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4 years ago

Helium gas (He) is an element and not a compound. Why is this true?

Chemistry

1 answer:

Dima020 [189]4 years ago

6 0

If we fill up a balloon with just helium gas, it will only contain helium atoms.

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Ionic crystals can form when metallic atoms bond with nonmetallic atoms. Which of the following is an example of an ionic crysta

Vanyuwa [196]

NaOH is an example of an ionic crystal.

Option a

<h3><u>Explanation:</u></h3>

Sodium Hydroxide is a "white solid ionic compound" consisting of sodium cations Na+ and hydroxide anions $OH^-$ . If we look at the crystal structure of NaOH, we can see that it has the combinations of ionic and covalent bonds. The bond that is shared between Oxygen ( O ) and Hydrogen ( H ) is the covalent bond.

The Sodium ( Na ) is bonded with an "ionic bond to the hydroxide part of the compound". NaOH is an ionic solid because it is formed by the combinations of metal and non-metal. When the crystal of NaOH is dissolved in water it dissociates into Na+ ions (which is ionic in nature) and $OH^-$ ions which bonds ionically to the other compounds.

6 0

4 years ago

How can I tell how many neutrons there are in an element

icang [17]

It all depends on if you know the mass number and atomic number then you will be able to find out what the amount of neutron in an element.

7 0

3 years ago

Write the balanced standard combustion reaction for the c5h7on3s2

AlexFokin [52]

Answer:

4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2

Explanation:

When C5H7ON3S2 under go Combustion, the following are obtained as illustrated below:

C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2

Now, let us balance the equation. This is illustrated below:

C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2

There are 3 atoms of N on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of C5H7ON3S2 and 6 in front of N2 as shown below:

4C5H7ON3S2 + O2 —> CO2 + H2O + 6N2 + S2

There are 20 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 20 in front of CO2 as shown below:

4C5H7ON3S2 + O2 —> 20CO2 + H2O + 6N2 + S2

There are 28 atoms on H on the left side and 2 atoms on the right side. It can be balance by putting 14 in front of H2O as shown below:

4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + S2

There are 8 atoms of S on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of S2 as shown below:

4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + 4S2

Now, there are a total of 54 atoms of O on the right side and 6 atoms on the left side

It can be balance by putting 25 in front of O2 as shown below:

4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2

Now, we can see that the equation is balanced.

4 0

3 years ago

An experiment with high validity is

uysha [10]

Answer:

extraneous variables.

Explanation:

5 0

3 years ago

Denise heard that little children will pick food based on color. So she offered 100 kindergarteners colored mashed potatoes for

Dvinal [7]

Answer:

I think the answer is B. the number of students choosing each color.

Explanation:

7 0

2 years ago