CHEMISTRY HIGH SCHOOL

What is Neons group and periodic number?

Answers

Answer 1
Answer: Its a noble gas. Its group number is 18 period number is 2
Answer 2
Answer:

Answer:Hello,

Neon is a noble gas. It is located Group 18 and the oxidation number is 10.

I hoped it helped have a nice day!

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Certain crops require a specific amount of annual rainfall to be successful. Which statement explains why coconut palm trees are successful in Florida?

Answers

Answer:

Coconut palm trees thrive in environments with temperatures above 64 degree Fahrenheit, that is tropical areas. Southern Florida is an ideal place for coconut palm trees to grow because it is tropical enough for them.

Explanation:
Because there is a lot of rain, it is a tropical area and has a tropical climate.

Hope this helps <3

Which statement about one atom of an element identifies the element?(1) The atom has 1 proton. (2) The atom has 2 neutrons.(3) The sum of the number of protons and neutrons in the atom is 3.(4) The difference between the number of neutrons and protons in the atom is 1.

Answers

the atom has one proton 

Which of the following processes uses electrical charges to separate substances? a. Spectrophotometry b. Chromatography c. Centrifugation d. Electrophoresis

Answers

The process that uses electrical charges to separate substances is "d. Electrophoresis."

What is electrical charge?

Electrical charge is a fundamental property of matter, and it is associated with the presence of elementary particles called electrons and protons.

Electrical charge is a fundamental concept in physics and plays a crucial role in many natural phenomena, including the behavior of atoms, the operation of electrical circuits, and the functioning of electronic devices.

Electrophoresis is a technique commonly used in biology and chemistry to separate charged molecules, such as DNA, RNA, and proteins, based on their size and charge.

Learn more about electrical charge on brainly.com/question/2373424

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For which of the following equilibria does Keq= [O2]?a. O2(l)<=>O2(g)
b. 2O3(g)<=>3O2(g)
c. 2H2O(l)<=>2H2(g)+ O2(g)
d. 2Hg(s)+ O2(g)<=>2HgO(s)
e. C(s)+ O2(g)<=>CO2(g)

Answers

its A if youre doing plato

Which set of numbers gives the correct possible values of l for n = 2? 0 0, 1 0, 1, 2 0, 1, 2, 3

Answers

The answer is 0 and 1

This is because for a given principal quantum number, n, the corresponding set of angular quantum numbers, l, is equivalent to a range between 0 and (n-1). For n=2, (n-1) is equal to 1, so the range is 0 and 1. The magnetic quantum number, m, can be determined by a range from -l to +l. So for this example, m = -1, 0, 1.

Answer:

b

Explanation:

on edge

The value of ΔH° for the reaction below is -126 kJ. The amount of heat that is released by the reaction of 25.0 g of Na2O2 with water is __________ kJ. 2Na2O2(s) + 2H2O(l) → 4NaOH(s) + O2(g) The value of ΔH° for the reaction below is -126 kJ. The amount of heat that is released by the reaction of 25.0 g of Na2O2 with water is __________ kJ. 2Na2O2(s) + 2H2O(l) → 4NaOH(s) + O2(g) 40.4 80.8 -126 67.5 20.2

Answers

The amount of heat that is released by the chemical reaction of 25.0 g of Na_(2)O_2 with water is -20.223 Joules.

Given the following data:

  • Mass of Na_(2)O_2  = 25.0 grams
  • Enthalpy of combustion = -126 kJ/mol

To find the amount of heat that is released by the chemical reaction of 25.0 g of Na_(2)O_2 with water:

First of all, we would determine the number of moles of Na_(2)O_2  in this chemical reaction:

                2Na_2O_2_((s)) + 2H_2O_((l)) ------> 4NaOH_((s)) + O_2_((g))

Number\;of\;moles \;(Na_(2)O_2)= (Mass\; of\;Na_(2)O_2)/(Molar\;mass\;of\;Na_(2)O_2)

Substituting the values into the formula, we have;

Number\;of\;moles \;(Na_(2)O_2)= (25.0)/(77.98)

Number of moles (Na_(2)O_2) = 0.321 moles.

Now, we can find the quantity of heat released when Na_(2)O_2reacts with water:

2 mole of  Na_(2)O_2 = -126 kJ/mol

0.321 mole of  Na_(2)O_2 = X kJ/mol

Cross-multiplying, we have:

2X = 0.321 × (-126)

2X = -40.446\n\nX = (-40.446)/(2)

X = -20.223 Joules.

Read more: brainly.com/question/13197037

Answer : The amount of heat released by the reaction is, 20.2 kJ

Explanation :

First we have to calculate the number of moles of Na_2O_2.

\text{Moles of }Na_2O_2=\frac{\text{Mass of }Na_2O_2}{\text{Molar mass of }Na_2O_2}

Molar mass of Na_2O_2 = 77.98 g/mole

\text{Moles of }Na_2O_2=(25.0g)/(77.98g/mole)=0.320mole

Now we have to calculate the heat released during the reaction.

The balanced chemical reaction is:

2Na_2O_2(s)+2H_2O(l)\rightarrow 4NaOH(s)+O_2(g)

From the reaction we conclude that,

As, 2 moles of Na_2O_2 releases heat = 126 kJ

So, 0.320 moles of Na_2O_2 releases heat = (0.320)/(2)* 126=20.2kJ

Therefore, the amount of heat released by the reaction is, 20.2 kJ
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