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3 years ago

Aluminum is an element. Which best describes what makes up a sample of aluminum?

Chemistry

2 answers:

Ksivusya [100]3 years ago

8 0

Answer:

One kind of atom.

Step-by-step explanation:

An <em>element</em> consists of one kind of atom.

Al is an element, so Al consists of one kind of atom.

C and D are <em>wrong</em> , because Al contains only atoms of aluminium.

Alinara [238K]3 years ago

3 0

Answer: one kind of atom

Explanation:

Element is a pure substance which is composed of similar atoms.It can not be decomposed into simpler constituents using chemical reactions.Example: Aluminium $Al$

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water $H_2O$

Thus as aluminium is made up of one kind of atom , it is considered as an element.

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3 years ago

The atoms of Group B elements _____ electrons when they form ions. options: A.either gain or lose B.gain C.cannot be determined

grigory [225]

The answer to the question :

The atoms of Group B elements _____ electrons when they form ions .

is :

D) lose

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3 years ago

Read 2 more answers

21.If the anion in an ionic compound is a nonmetal, you must change its ending

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Answer:

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Explanation:

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2 years ago

In trying to control fall armyworms in crops, an Agriculture extension officer applied cypermethrin which was prepared by dissol

sveta [45]

Answer:

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.0086

Explanation:

Mole fraction remains a sort of concentration. It indicates:

moles of solute / (moles of solute + moles of solvent)

Moles of solute / Total moles.

Solute: Cypermethrin → C₂₂H₁₉Cl₂NO₃

Solvent: Water (PM = 18g/mol)

We calculate moles from solvent: 1000g /18 g/mol = 55.5 moles

We calculate PM for C₂₂H₁₉Cl₂NO₃

12g/mol . 22 + 1g/mol . 19 + 35.45 g/mol . 2+ 14g/mol + 16g/mol . 3 = 416 g/m

Moles of solute: 200 g / 416g/mol = 0.481 moles

Total moles: 0.481 + 55.5 = 55.98 moles

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.481 moles / 55.98 moles = 0.0086

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2 years ago

Which of the following fibers should not be in this group?

ryzh [129]

Answer:

Nylon

Explanation:

This should not be in this group

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3 years ago