What is a chemical bond?a. a representation of chemical properties
b. a substance that's composed of atoms
c. the force that holds together the elements in a compound
d. the attraction of two atoms that holds the atoms togethe?

Answers

Answer 1

Answer:

Answer: -

A chemical bond is

C) the force that holds together the elements in a compound.

Explanation: -

A chemical bond results when there is a transfer of electrons from 1 element to another or there is a sharing of electrons between two element atoms.

Due to this compounds are formed.

Hence A chemical bond is

C) the force that holds together the elements in a compound.

Answer 2

Answer:

the correct answer should be c.

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How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

Answers

Considering the definition of molar mass, 1.26 moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃.

The given molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

Al= 27 g/mole
O= 16 g/mole
H= 1 g/mole

So, the molar mass of the compound Al(OH)₃ is calculated as:

Al(OH)₃= 27 g/mole + 3× (16 g/mole + 1 g/mole)

Solving:

Al(OH)₃= 78 g/mole

Next, you can apply the following rule of three: if 78 grams of the compound are contained in 1 mole, 98.3 grams are contained in how many moles?

$amount of moles=(98.3 gramsx1 mole)/(78 grams)$

amount of moles= 1.26 moles

1.26 moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃.

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We have to calculate the molar mass of AL(OH)₃
Atomic mass (Al)=27 amu
Atomic mass (O)=16 amu
Atomic mass (H)=1 amu

molecular weight= 27 amu+3(16 amu + 1 amu) =78 amu.

Therefore, the molar mass of Al (OH)₃ is 78 g/ mol

Now, we calculate the number of moles in 98.3 g of aluminum hydroxide.

78 g-------------------1 mol
98.3 g----------------- x

x=(98.3 g * 1 mol) / 78 g=1.26 moles.

Answer: 1.26 moles.

The science that deals with the study of the stuff that makes up the universe is chemistry??

Answers

I believe that its chemistry

What is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level ?a.) 1.52x10^4 J b.) 3.63*10^-19 J c.) 2.18x10^-19 J d.) 4.48x10^-9 J e.) 3.03*10^-19J

Answers

$3.03*10^-19J$ is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.

What are Energy Levels?

The electrons that surround an atom around the nucleus are located in regions called "energy levels". It represents the 3-D space that surrounds the nucleus where the electrons are present. It is divided into several energy levels such as first energy level, second energy level and so on.

The level that is closest to the nucleus is the first energy level, then the second one is further away from it, then the third one is a little further away and so on. Each energy level has different number of electrons like first has 2 electrons, second has 8, third has 8 and so on. The electrons which are further away from the nucleus are called valence electrons.

For given above information,

E = - $E_o$ / $n^2$

where,

$E_o$ = 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on so that the ground state has energy $E_1$ = -13.6 eV and the second energy level (the first excited state) has energy $E_2$ = -13.6/4 eV = -3.4 eV.

So,

1eV = 1.602× $10^-^1^9$ J

Energy difference can be calculated by -13.6eV ( $1/$ $n^3_f$ - $1/n^2_i$ )

$n_f$ = Final energy; $n_i$ = Initial energy

1.88 eV is equals to x

So, x= 3.03* $10^-^1^9$

Thus, $3.03*10^-19J$ is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.

Learn more about Energy Level, here:

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The energy carried by light waves is taken in by particles of matter.What type of wave interaction does this statement describe?
A
absorption
В.
reflected
C.
refraction
O D.
scattering

Answers

Answer:

B absorption

Explanation:

because absorption is the transfer of energy carried by light waves to particles of matter

B the wave must be reflected

Which of the following is an example of a homogeneous mixture? A. Bronze
B. Sand
C. Copper
D. Zinc

Answers

Homogeneous (in terms of Chemistry) means "in the same physical state"

For example if Nitrogen and Hydrogen reacted, and they were both gases, the reaction would be homogeneous.

Sand is a compound, so therefore not a mixture.

Copper and Zinc are both elements, so again, not a mixture.

Bronze is an alloy, a mixture of Copper and Tin. As Copper and Tin are both solid (metals), we can say this mixture is homogeneous.

The answer is (A) Bronze.

The correct answer is:

A. Bronze

Explanation:

Bronze is an alloy consisting principally of copper, generally with about 12% tin and often with the extension of other metals and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.Both copper and tin are solid.

A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. Conversely, a heterogeneous mixture has elements whose dimensions vary completely the sample. Water itself is an example of a homogeneous mixture. It often includes dissolved metals and gases, but these are removed throughout the water.

What is the mass of 3.0 x 10^23 atoms of neon