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4 years ago

Does anyone know the answer to the question?? Please help I have a quiz tomorrow

Chemistry

2 answers:

marin [14]4 years ago

7 0

Density is mass divided by volume, so the answer is B.

Zanzabum4 years ago

6 0

Heya!!!!

Answer to your question:

7. B)Mass per unit volume

formula for density is:

density=mass/volume

8.A) Behavior

This behaviour of magnets is due to the movement patterns of electrons.

Hope it helps *_*

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Which process causes earth to lose thermal energy to space?

Andru [333]

Radiation I believe

7 0

3 years ago

Read 2 more answers

Calculate by (a)% weight and (b) %mole each of the elements present in sugar

Musya8 [376]

Explanation:

Molecular mass of sugar = $C_{12}H_{22}O_{11}$ : = 432 g/mol

Atomic mass of carbon atom = 12 g/mol

Atomic mass of hydrogen atom = 1 g/mol

Atomic mass of oxygen atom = 16 g/mol

a) Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100$

Percentage of carbon by weight in $C_{12}H_{22}O_{11}$ :

$\frac{12\times 12 g/mol}{342 g/mol}\times 100=42.10\%$

Percentage of hydrogen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{22\times 1g/mol}{342 g/mol}\times 100=6.43\%$

Percentage of oxygen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{11\times 16g/mol}{342 g/mol}\times 100=51.46\%$

b) Percentage of mole each of the elements present in sugar:

= $\frac{\text{Moles of atoms of an element}}{\text{total moles of all types of atoms}}\times 100$

In mole of sugar we have 12 moles of carbon atom , 22 moles of hydrogen atoms and 11 moles of oxygen atoms.

Percentage of carbon by mole in $C_{12}H_{22}O_{11}$ :

$\frac{12 mol}{45 mol}\times 100=26.66\%$

Percentage of hydrogen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{22 mol}{45 mol}\times 100=48.88\%$

Percentage of oxygen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{11 mol}{45 mol}\times 100=24.44\%$

7 0

4 years ago

Helpppppppppppppppppppppp

inn [45]

Answer:

Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and electrons.

8 0

3 years ago

Help please!!!!

frez [133]

It is either D or B

Hope I helped

8 0

3 years ago

Question 1 (1 point)

Colt1911 [192]

Answer:

Both are made up of two substances that are not chemically combined.
oxygen (O2)
carbon dioxide (CO2 )
air (N2 mixed with O2 and CO2)
Pure substances cannot be separated by physical means.

Explanation:

8 0

3 years ago