CHEMISTRY HIGH SCHOOL

Which of the following compounds contains both ionic and covalent bonds?Select one:
a. NH3
b. NaNO3
c. CH3OH
d. AlCl3

Answers

Answer 1
Answer:

Answer:

d. AlCl3

Explanation:

In AlCl₃ each Al³⁺ cation is surrounded by three Cl⁻ anion. Al³⁺ has a small ionic radius giving it a high charge density whereas Cl⁻ has a large ionic radius, low charge, and easily polarizable. Al³⁺ pulls one electron from each of the three Cl⁻ ion thus giving the Al-Cl bond a covalent character.  
Answer 2
Answer: NaNO3 because Na is a cation allowing it to bond with anions which are NO3. NO3 is a covalent compound because nitrogen and oxygen are sharing electrons when they bond; thus making a covalent bond

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Given the balanced ionic equation representing a reaction:2A1(s) + 3Cu2+(aq) ==>2A13+(aq) + 3Cu(s)
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Answers

the answer should be (4)

Which of the following statements is correct?A large Keq value indicates that products are favored.
A small Keq value indicates that the reverse reaction will occur very quickly.
A large Keq value indicates that reactants are favored.
A small Keq value indicates that products are favored.

Answers

The statements that are correct are ‘A large Keq value indicates that products are favored.’ And ‘A small Keq value indicates that the reverse reaction will occur very quickly.’ Having large Keq means that the concentration of the product is greater than the reactants and so products are favored. Having small Keq means that the concentration of the reactants is greater than the product.

A large Keq value indicates that products are favored.

In an ionic compound, the smallest whole-number ratio of positive and negative ions thatresults in a neutral unit is called the

Answers

In an ionic compound, the smallest whole-number ratio of positive and negative ions that results in a neutral unit is called the formula unit.

What is ionic compound?

  • The compound formed by the ionic bond is called ionic compound.
  • The ionic compound is stronger than covalent compound.
  • The ionic compound contains positive part called cation and negative part called an anion.
  • Example: sodium chloride ( NaCl)

What is ionic bond?

  • The bond formed by the complete transfer of electrons is called ionic bond.

learn about ionic compound,

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Answer:

It is called the formula unit

Nonrenewable energy sources _____.can be quickly replenished
are easily recycled
can eventually be used up
never cause pollution

Answers

Non-renewable energy sources CAN EVENTUALLY BE USED UP.

Non renewable energy sources refer to those energy sources that can not be replenished. Once they are used up, new one can not be formed or produced, this is because they can only be formed by natural processes and these processes take millions of years to occur. Examples of non renewable energy sources are: coal, natural gas and oil. All the fuels obtained from fossils are non renewable in nature.

Answer:

The correct answer is option C, can eventually be used up

Explanation:

Nonrenewable energy sources are those resources which if once used cannot be re used again.  

For example – Coal, petroleum(petrol & diesel), fossils, natural gas etc.  

These resources cannot be replenished if once they are consumed as they take millions of year to form.

Also all these resources are made up of hydrocarbons thus they produce polluting gases on burning except natural gas.  

A 65.0-gram sample of some unknown metal at 100.0° C is added to 100.8 grams of water at 22.0° C. The temperature of the water rises to 27.0° C. If the specific heat capacity of liquid water is 4.18 J/ (°C × g), what is the specific heat of the metal?

Answers

We do a heat balance to solve this:
(m cp ΔT)water = -(m cp ΔT)metal
100.8 (4.18) (27 - 22) = -65 (cp)(27-100)
cp = 100.8 (4.18) (27 - 22) / (-65 (27-100))
cp = 0.44 J/ (°C × g)

The specific heat of the metal is 0.44 J/ (°C × g)

He statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. conservation of matter.
B. atomic disintegration.
(C.) conservation of energy.
D. definite proportions.

Answers

Law of C. conservation of energy states that energy can neither be created nor destroyed, but can be changed from one form to another (such as from potential energy to kinetic energy).

Hope this helps~
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