HELP PLEASE I need help with these 2 chem questions asap i would gladly appreciate it :)

Answers

Answer 1

Answer: 10) You need to find the atomic mass of every element, which you can get from any periodic table.

a) 6.02x10^23 atoms of Mg

Atomic mass of Mg = 24.3 g/mol

# of mols = 6.02 x 10^23 atoms / 6.02 x 10^23 atoms/mol = 1 mol

mass = 1 mol x 24.3 g/mol = 24.3 g

b) 3.01x10^23 formula units of Ca Cl2

Atomic masses

Ca: 40 g/mol
Cl: 35.5 g/mol

Formula mass: 40g/mol + 2x 35.5g/mol = 111 g/mol

# of mols = 3.01 x 10^23 / 6.02 x 10^23 = 0.5 mol

mass = 0.5 mol x 111 g/mol = 55.5 g

c) 12.4 x 10^15 molecules of CH2O

formula mass = 12 g/ mol + 2 g/mol + 16 g/mol = 30 g/mol
# of mols

mass = [12.4 x 10^15 / 6.02 x 10^23]mol x 30 g/mol = 2.1 x 10 ^(-8) g

3)

a) The polar solute is dissolved in water which is a polar solvent, while the non polar solute is not dissolved in water. This is a rule in chemistry: polar solvents dissovle polar soultes and non polar solvents dissolve non polar soluted.

The extremes of the polar molecules are easily solvated by the water molecules.

b) KI is an ionic compound, which implies that it will ioinize (separare in iones) in water, being in this way be dissolved, while the CO2, which is no polar, will not be easily dissolved in water under normal conditions

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What were the limitations of democritus's ideas about atoms

Answers

he thought that atoms were the smallest particle and could not be divided any more. the word 'atomos' which atom is derived from, means indivisible. we now know that atoms are made of sub-atomic particles, which are made of quarks (what sort of name is that), and these quarks are made of leptons and gluons.

Final answer:

Democritus's ideas about atoms were limited in that he claimed they were indivisible and indestructible, lacked experimental evidence, and didn't account for chemical behavior or atomic bonding.

Explanation:

Democritus, an Ancient Greek philosopher, made significant strides in atomic theory. However, his ideas had several limitations. Firstly, he believed that atoms were indivisible and indestructible, which we now know is incorrect, with subatomic particles like protons, neutrons, and electrons forming atoms. Secondly, Democritus had no experimental evidence to support his ideas, they were purely philosophical. Lastly, his theory did not account for chemical behavior or the bonding of atoms, concepts that are now fundamental to our understanding of chemistry.

Learn more about Democritus's ideas about atoms here:

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1. what type of ion is chlorine ?2. what type of ion is oxygen?
3. what type of ion is
magnesium?
4. what type of ion is silicone?
5. what type of ion is carbonate?
6. what type of ion is nitrate?

Answers

Answer:

1. Univalent negative ion (Cl-)

2. Divalent negative ion (O2-)

3. Divalent positive ion (Mg2+)

4. Divalent negative ion (S2-)

5. Divalent negative ion (CO3)^2-

6. Univalent negative ion (NO3) ^-

1 . It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents.

What property must a solid have to be considered a crystalline solid

Answers

The atoms of the solid have to form a crystalline structure, which means that they have an ordered configuration that is the same throughout the entire solid.

What is the balanced equation for S8 +O2 →SO3

Answers

Answer:

S8 + 12O2 ---> 8SO3

Explanation:

S8 + 12O2 ---> 8SO3

Explain the advantages of crystallisation over evaporation

Answers

crystalization seperates as solid crystals and if we r evapourated its being lost and both r heating ofcourse.

As the temperature of a gas decreases, what change occurs in the amount of kinetic energy?

Answers

Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed.