CHEMISTRY HIGH SCHOOL

How many neutrons are in an atom of sulfur with a mass number of 35?a. 16
b. 17
c. 18
d. 19

Answers

Answer 1
Answer: As the mass difference between protons and neutrons isn't too different we can determine how many neutrons an atom has by subtracting the number of protons from its atomic mass.

Sulfur has 16 protons, so 35-16 = 19. So there are 19 neutrons present.

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Help! answer 7 & 9 please.​

Answers

Answer:

7 : I think it is because heat rises, and to make the hot air balloon ride is the fire torch inside it.

Explanation:

I donno 9

A covalent bond in which electrons are shared unequally isa. polar.
b. a double bond.
c. ionic.
d. polyatomic.

Answers

Covalentbonds = sharing of electrons between two atoms of the same elements or elementsclose to each other on the periodic table. Usually they are metals sometimesnon-metals. In polar bonds electrons areshared unequally. Non polar bonds share electrons equally.

Final answer:

A covalent bond where electrons are shared unequally is known as a polar bond. This unequal sharing occurs due to differences in electronegativity between the two atoms involved in the bond.

Explanation:

A covalent bond in which electrons are shared unequally is defined as a polar bond. This corresponds to option a) polar. This occurs because one atom is more electronegative and pulls the shared electron pair towards its nucleus making the bond polar, having a partial positive and partial negative end. Option b) a double bond, refers to a covalent bond where two pairs of electrons are shared between atoms. Option c) ionic refers to a bond where electrons are completely transferred from one atom to another and option d) polyatomic refers to a molecule that consists of more than two atoms.

Learn more about Polar Bond here:

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1. A sample of nitrogen occupies a volume of 250 mLat 298 K. What volume will it occupy at 268 K?

Answers

Answer:

0.225 L = 225 mL

Explanation:

Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up

Mathematically, we can write that as:

V1/T1 = V2/T2, where 1 and 2 are the two situations

So, when we substitute the values in, we get:

0.25 L/298 K = V2/268 K

Rearranging this, we get:

(0.25/298) x 268 = 0.225 L = 225 mL.

This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)

Let me know if this makes sense, and hope I helped! :)

Elements abundant in the body are not abundant on Earth.
a. True
b. False

Answers

Answer:

false is the correct answer,

Explanation:

The most abundant elements present in the body is carbon, oxygen, hydrogen, calcium, nitrogen, and phosphorus.

About 99 percent of the human body is made of ( carbon, hydrogen,oxygen, calcium, nitrogen, and phosphorus.) elements and 0.85 percent is made up of sulfur, sodium, potassium, chlorine, and magnesium and these all elements are abundant on Earth.

Thus the Elements abundant in the body are abundant on Earth.
B. False
 
Most of the body is made up of oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus, all of which are abundant on Earth.

Write the atomic symbols for isotopes with the following characteristics? 1)an oxygen atom with 10 neutrons 2)a neon atom with twelve neutrons 3)25 electrons and 28 neutrons 4)a mass number of 24 and 13 neutrons 5)a titanium atom with 25 neutrons

Answers

Isotopes are elements that differ in the number in neutrons while the numner of protons are the same. The answers of the questions are: 1) 18/8 O 2) 22/10 Ne 3) 53/25 Mn 4) 37/24 Cr 5) 106/81 Ti.

The thermal transfer of energy by electromagnetic waves through the vacuum of space is called what?

Answers

Answer: Radiation

Explanation: There are three modes of heat transfer:

1. Conduction: This type of heat transfer happens when there is direct contact between the two object.

2. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
Radiation i think is the correct answer
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