CHEMISTRY HIGH SCHOOL

Find the number of kilometers in 92.25m.

Answers

Answer 1

Answer:

The length measurement in kilometers will be -

92.25 x 10⁻³ Kilometers.

We have length measurement of 92.25 m.

We have to determine the number of kilometers in this much length.

How many maters are there in one kilometer ?

In 1 km there are 1000m

According to the question -

Length measurement = L = 1 meter

In kilometers, the length will be = 1 /1000 x 92.25 =

92.25 x 10⁻³ Kilometers.

Therefore, the length measurement in kilometers will be -

92.25 x 10⁻³ Kilometers.

To solve more questions on Unit conversions, visit the link below-

brainly.com/question/1931889

#SPJ2

Answer 2

Answer: 1000m = 1km
92.25m= ?

We cross multiply
92.25/1000
= 0.09225

Therefore, 92.25m = 0.09225km

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Wtite and balence the equation for formation of so3 from so2 and oxygen gases

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2SO3----> 2SO2 + O2 is how you do it

Calculate the number of atoms in 23 g of sodium (Na).

Answers

First find moles of sodium:
(23.0g Na)/(22.99g/mol Na) = 1mol Na

Second multply moles by Avogadro's number: (1mol Na)(6.02x10^23 atoms) = 6.02x10^23 atoms Na

Which elements can react to produce a molecular compound?(1) calcium and chlorine
(2) hydrogen and sulfur
(3) lithium and fluorine
(4) magnesium and oxygen

Answers

The elements that can react to produce a molecular compound is hydrogen and sulfur

Explanation

A molecular compound is formed when two or more atoms join by sharing electrons through a covalent bond.

Sharing of atoms occurs mainly between non metals.

Hydrogen ( a non metal) and sulfur(a non metal) react to form a molecular compound by sharing electron among themselves.
2 hydrogen atom bond with 1 atom sulfur to form hydrogen sulfide.

$\boxed{\left( 3 \right){\text{ Hydrogen and sulfur}}}$ can react to produce a molecular compound.

Further Explanation:

Covalent or molecular bond is formed when two or more non-metals share electrons between them. Such electron pairs are called bonding or shared pairs. The compounds formed as a result of these bonds are called covalent or molecular compounds.

Covalent bonds can be a polar covalent or nonpolar covalent bond. The bonds formed as a result of electron sharing between the atoms having some electronegativity difference between them are polar covalent bonds. HCl shows such type of bonding in it. The bonds formed when electrons are shared between the bonded atoms and these have no or slight difference in their electronegativities are called nonpolar covalent bonds. The bonds present in a $\text{CH}_4$ molecule are nonpolar covalent bonds.

Another type of bonding that occurs due to the complete transfer of electrons from one atom to the other is called ionic bonding. Such a process includes the formation of charged species called ions. Ions can have positive or negative charges on them. The charged species having a positive charge are cations while those having negative charges are anions.

(1) Calcium and chlorine

Calcium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms $\text{Ca}^(2+)$ . Chlorine is highly electronegative in nature so two chlorine atoms accept the electrons donated by calcium and forms $\text{Cl}^-$ ions. Therefore $\text{CaCl}_2$ is formed which is an ionic compound.

(2) Hydrogen and sulfur

Both these atoms are nonmetals. So they share electrons with each other and as a result, a covalent or molecular compound is formed.

(3) Lithium and fluorine

Lithium belongs to group 1A of the periodic table and is highly electropositive in nature. So it loses an electron to form $\text{Li}^+$ . Fluorine is highly electronegative in nature and therefore it accepts the electrons donated by lithium and forms $\text{F}^-$ . Therefore LiF is formed which is an ionic compound.

(4) Magnesium and oxygen

Magnesium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms ${\text{M}}{{\text{g}}^(2 + )}$ . Oxygen is highly electronegative in nature so it accepts the electrons donated by magnesium and forms ${{\text{O}}^(2 - )}$ . This results in the formation of MgO which is an ionic compound.

Therefore a molecular compound is formed when hydrogen and sulfur react with each other.

Learn more:

What is a typical characteristic of an ionic compound? brainly.com/question/6071838
What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: covalent bond, molecular bond, cations, anions, calcium, chlorine, hydrogen, sulfur, lithium, fluorine, magnesium, oxygen, molecular compound, ionic compound.

Collisions of helium atoms with the walls of a closed container causea. condensation.
b. gas pressure.
c. a decrease in volume.
d. an overall loss of energy.

Raising the temperature of a gas will increase its pressure if the volume of the gas
a. and the number of particles are increased.
b. is increased, but the number of particles is constant.
c. and the number of particles are constant.
d. is constant, but the number of particles is reduced.

Answers

1) Option b: gas pressure.

This is sustainted by the kinetic molecular theory of the gases.

2) Option c: raising the temperature of the gas will increase the pressure if the volumen of the gas and the number of particles are constant.

PV = nRT

If V and n are constant, P is proportional to T, then if T increase P will increase too.

In less scientific words

For number 1 is GAS PRESSURE

And number 2 is TEMPERATURE

I hope this works for you guys
:)

Starting a fitness plan slowly will lead to better results than starting out quickly TRUE OR FALSE

Answers

True. Hope that helps!

Starting a fitness plan slowly will lead to better results than starting out quickly TRUE OR FALSE.True

a student decreases the temperature of a 556 cm^3 balloon from 278 K to 231 K. Assuming constant pressure, what should the new volume of the balloon be

Answers

Given:
A student decreases the temperature of a 556 cm^3 balloon from 278 K to 231 K at constant pressure
Required:
new volume of the balloon
Solution:
Apply Boyle's law
V1/T1 = V2/T2
(556 cm3) / (278K) = V2 / (231 K)
V2 = 462 cm3

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