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3 years ago

HELP ASAP PLEASE!!!

Chemistry

1 answer:

fenix001 [56]3 years ago

4 0

Answer:

Because alkenes and alkynes are defined as molecules with at least one double (in the case of alkenes) or triple (in the case of alkynes) bond between two carbon atoms, while alkanes have only single bonds between any pair of carbon atoms.

Explanation:

Alkenes and alkynes are unsaturated molecules, because they have, at least, two adjacent carbon atoms bonded together by either a doubler or a triple bond: - C = C - or - C ≡ C -.

Hence, at least two carbon atoms are needed to form those double or triple bonds, while alkanes have only single bonds. The example of alkane with only one carbon atom is methane: CH₄, which is the most simple alkane.

The most simple alkene is CH₂ = CH₂, and the most simple alkyne is CH≡CH.

As you see, the very definition of alkenes and alkynes forces that those molecules must have at least two carbon atoms.

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Explanation:

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3 years ago

What is the mass number of a carbon isotope with 10 neutrons

Korvikt [17]

Answer:

16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13

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3 years ago

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calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?

Stells [14]

Answer:

$0.15008\ \text{g}$

$3.23\times 10^{21}$

Explanation:

1 mol of nitrogen at STP = 22.4 L = 22400 cc

n = Mol of $N_2$ = $\dfrac{120}{22400}=0.00536\ \text{mol}$

M = Molar mass of $N_2$ = $28\ \text{g/mol}$

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

Mass of $N_2$ is

$m=nM\\\Rightarrow m=0.00536\times 28\\\Rightarrow m=0.15008\ \text{g}$

Mass of the nitrogen is $0.15008\ \text{g}$

Number of molecules is given by

$nN_A=0.00536\times 6.022\times 10^{23}=3.23\times 10^{21}\ \text{molecules}$

The number of molecules present in it are $3.23\times 10^{21}$

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3 years ago

Metals react with ______ to form compounds that are alkaline.

kondor19780726 [428]

Metals react with ______ to form compounds that are alkaline.

A. metalloids

B. oxygen (O)

C. non-metals

D. hydrogen (H)

The answer is D, Hydrogen (H).

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Monica [59]

Answer:

The mass of a pure substance represents a specific number of pure substance 'molecules', as defined by molecular weight. The relative atomic mass (atomic weight) in grams/mole (g/mol) is the molar mass of a substance, which means it is the mass of one mole of that substance.

Explanation:

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3 years ago