CHEMISTRY MIDDLE SCHOOL

Type the correct answer in the box. Oxygen is in group 16, and it has
v
alence electrons.
Reset
Ne

Answers

Answer 1
Answer:

Answer: 6 valence electrons

Explanation: the valence electrons and group are always the same, but when the group numbers are 10 and above, they would be the first number. For example, every element in group 16 has 6 valence electrons.


Related Questions

MIDDLE SCHOOL

If an unknown quantity of gas is held at a temperature of 789 K in a container with a volume of 22.0 L and a pressure of 765 torr, how many moles of gas are there?​

Answers

Answer:

n = 0.34 mol

Explanation:

Given data:

Given temperature = 789 K

Pressure = 765 torr ( 765/760 = 1.0 atm

Volume of container = 22.0 L

Number of moles of gas = ?

Solution:

Formula:

PV = nRT

n = PV/RT

n = 1.0 atm × 22.0 L / 0.0821 atm.L/mol.K ×789 K

n = 22.0 L.atm /64.8 atm.L/mol

n = 0.34 mol

MIDDLE SCHOOL

How many moles are in the following quantities of matter?
400 grams of rubbing alcohol (C,H,O)

Answers

Given:

Quantity of rubbing alcohol = 400 grams

To find:

The number of moles in 400 grams of rubbing alcohol

Solution:

Isopropyl alcohol is also known as rubbing alcohol. The molecular formula for Isopropyl Alcohol is .

Molar mass of = 60.09502 g/mol. That is there is  grams of isopropyl alcohol in 1 mole.

There would be,

Therefore, there are 6.65612558245 moles in 400 grams of rubbing alcohol.

HIGH SCHOOL

gas-to-liquid synfuel production can produce diesel, naptha and paraffin. The formation of these products usually involves _____. the Fischer-Tropsch Process the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid the production of radioactive waste that must be stored in protective barrels

Answers

The second option is wrong

Answer: the Fischer-Tropsch Process

Explanation:

just took the quiz

HIGH SCHOOL

The pH of an aqueous solution is 4.32. What is the [OH–]?

Answers

2.10 x 10^-10 M. Ans


pH + pOH = 14
Where, pOH is the power of hydroxide ion concentration and pH is the power of concetration of the H+ ion.
Now, pOH = 14 - 4.32
= 9.68
Now, the concentration of [H+] is 10-7 M, then pH is 7 and for [OH-] = 10-7 M, the pOH is also 7.

Now, pOH = -log[OH-]
[OH-] = 10^- pOH
= 10^-9.68
= 2.10 x 10^-10 M

MIDDLE SCHOOL

Winds generally flow away from the equator and towards the poles What transfer does this flow of wind Cause ?

Answers

Explanation:

Warm wind is present at the equator and because the molecules of warm air has more kinetic energy, therefore, they move away from the equator towards the poles.

Now, at the poles cold or cooler air is present which is replaced by warm air. Then this cooler air moves towards the equator.

Flow of these winds is due to the heat which helps in their movement.




An energy transfer, with heat energy moving away from the equator
MIDDLE SCHOOL

What volume will 2.0 moles of nitrogen occupy at .947atm and 20° C?

Answers

Answer:

The volume is 50, 74 l

Explanation:

We use the formula PV = nRT. The temperature in Kelvin is = 273+ 20 =293K

PV=nRT ---> V = (nRT) / P

V= (2.0 mol x 0,082 l atm /K mol x 293 K) / 0,947 atm

V=50,74128828 l

MIDDLE SCHOOL

In which of these reactions is energy released​

Answers

Answer:

What are the answers ?

Explanation:

HIGH SCHOOL

How many moles of CuSO4 are used to make 250 ml of a 0.50 M CuSO4 solution? A) 0.002 mol B) 0.125 mol C) 0.319 mol D) 0.795 mol

Answers

Answer: 0.125moles

Explanation:

From the question above, we are only given the values of the volume and molar concentration of CuSO4 solution.

Volume of CuSO4 solution = 250mL= 250/1000L = 0.25L

Molar concentration of CuSO4 solution= 0.50M

Number of moles of CuSO4= Molar concentration of CuSO4 × volume of CuSO4

Number of moles of CuSO4= 0.50mol/dm^3 × 0.25L

Number of moles of CuSO4= 0.125moles

Therefore 0.125moles of CuSO4 are used to make 250 mL of a 0.50M CuSO4 solution.

Answer:

We have 0.125 moles of CuSO4 (Option B)

Explanation:

Step 1: Data given

Volume = 250 mL = 0.250 L

Molarity  CuSO4 = 0.50 M

Step 2: Calculate moles

Molarity = Number of moles / volume (in L)

Number of moles = Molarity * volume

Number of moles CuSO4 = 0.50 M * 0.250 L

Number of moles CuSO4 = 0.125 moles

We can control this by calculating the molarity:

0.125 moles / 0.250 L = 0.50 M

We have 0.125 moles of CuSO4 (Option B)

HIGH SCHOOL

Which property of a substance indicates whether the substance is a liquid or a solid at room temperature?

Answers

Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Therefore, intermolecular forces of attraction is used in determining the states of a matter.

What is intermolecular forces of attraction?

Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.

Size of electronegative molecule is small so, if any other molecule or molecule come into contact with this molecule then this molecule attract the electron of other molecule very efficiently and therefore the force between the molecule increases.

Intermolecular forces of attraction helps in determining the states of matter whether its liquid, gas or solid. Melting point and boiling point is directly proportional to intermolecular forces of attraction.

Therefore, intermolecular forces of attraction is used in determining the states of a matter.

To learn more about intermolecular forces of attraction, here:

brainly.com/question/26701678

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This property would be the melting point. If the melting point is below room temperature, the substance will be a liquid at room temperature. If the melting point is above room temperature, the substance will be a solid at room temperature.
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