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2 years ago

Which of the following would be considered a compound? He CI NaCl B

Chemistry

1 answer:

kobusy [5.1K]2 years ago

5 0

Answer:

NaCl

Explanation:

because He which is helium gas its an element alone,

Cl which is chlorine is a single element,

B which is Boron and its a single element,

but NaCl which is simply called table sugar is the combination between Na, sodium and Cl, chlorine , so its called a compound not an element.

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Abbreviated electron configuration for tellurium

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Answer:

The ground state electron configuration of ground state gaseous neutral tellurium is [Kr]. 4d10.

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CaO is an ionic bond

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3 years ago

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In the periodic table hydrogen is placed in Group 1A (group 1) and helium is placed in Group 8A (group 18). The most likely reas

Alexus [3.1K]

Answer:

This question appears incomplete

Explanation:

This question appears incomplete because of the absence of options. However, hydrogen is placed in group 1 because it has just one electron in it's outermost shell (which happens to be the only shell it has) just like every other group 1A/group 1 element. While helium is placed in group 8A/group 18 because it has a completely filled outermost shell (which is also the only shell it has) just like every other element in group 8A/group 18.

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2 years ago

2.478 g of white phosphorus was used to make phosphine according to the equation: P₄(s) + 3OH⁻(aq) + 3H₂O(l) → PH₃(g) + 3H₂PO₂⁻(

prohojiy [21]

<u>Answer:</u> The amount of white phosphorus is 0.0199 moles

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of white phosphorus = 2.478 g

Molar mass of white phosphorus = 124 g/mol

Putting values in above equation, we get:

$\text{Moles of white phosphorus}=\frac{2.478g}{124g/mol}=0.0199mol$

Hence, the amount of white phosphorus is 0.0199 moles

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3 years ago