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3 years ago

HELP FAST!!!

Chemistry

2 answers:

katovenus [111]3 years ago

8 0

Answer:

its A heat causes the molecules in the cube to expand and forces them apart.

Explanation:

xeze [42]3 years ago

7 0

Answer:

Explanation:

D. The transfer of thermal energy to the ice cube causes its molecules to move faster.

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A solar powered car converts __________ energy into _____________ energy.

kotykmax [81]

Answer:

Explanation:

Solar power takes in light and turns it into a usable energy. if used in a vehicle that would take light energy and transform it into mechanical energy.

3 0

3 years ago

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Which is larger, an atom or a molecule??

skad [1K]

A molecule is larger because it is a bond of atoms.

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3 years ago

Rank these transition metal ions in order of decreasing number of unpaired electrons.

lesya692 [45]

Answer: The given transition metal ions in order of decreasing number of unpaired electrons are as follows.

$Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}$

Explanation:

In atomic orbitals, the distribution of electrons of an atom is called electronic configuration.

The electronic configuration in terms of noble gases for the given elements are as follows.

Atomic number of Fe is 26.

$Fe^{3+} - [Ar] 3d^{5}$

So, there is only 1 unpaired electron present in $Fe^{3+}$ .

Atomic number of Mn is 25.

$Mn^{4+} - [Ar]3d^{3}$

So, there are only 3 unpaired electrons present in $Mn^{4+}$ .

Atomic number of V is 23.

$V^{3+} - [Ar] 3d^{2}$

So, there are only 2 unpaired electrons present in $V^{3+}$ .

Atomic number of Ni is 28.

$Ni^{2+} - [Ar] 3d^{8}$

So, there will be 2 unpaired electrons present in $Ni^{2+}$ .

Atomic number of Cu is 29.

$Cu^{+} - [Ar] 3d^{10}$

So, there is no unpaired electron present in $Cu^{+}$ .

Therefore, given transition metal ions in order of decreasing number of unpaired electrons are as follows.

$Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}$

Thus, we can conclude that given transition metal ions in order of decreasing number of unpaired electrons are as follows.

$Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}$

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3 years ago

Label the slightly negative and slightly positive parts of the water molecule. Use this illustration to explain polarity.

Daniel [21]

The water molecule is a polar molecule which would mean that there is an uneven distribution of charges. Each molecule of water has partial positive and partial negative end. The partial positive charges is found in the H atoms while the partial negative is at the O atom. This is due to the the unequal sharing of the electrons.

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Why cant humans live off sunlight

Liula [17]

They will have no air and no energy or food. No food for animals, so animals die, and humans die with the lack of food, meat and plants

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3 years ago