CHEMISTRY MIDDLE SCHOOL

Predict the formula of magnesium argonide

Answers

Answer 1

Answer:

Answer:The formula of magnesium argonide is H2MgO

Explanation:

Answer 2

Answer:

Answer:

H2MgO that is the answer. have a nice day.

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Nitrogen dioxide reacts with the sunlight and combines with particles from smoke and soot to form industrial smog.TrueFalse
PLZ help

Answers

Answer:

False

Explanation:

i tried true and it didnt work.

8. What is the heat of reaction when hydrogen and oxygen combine to form water?2H2(g) + O2(g) → 2H2O(1)
(AHC H20(I) = -285.8 kJ/mol)
A -120.9 kJ
B-241.8 kJ
C-571.6 kJ
D-285.8 kJ

Answers

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

$2H_(2)(g)+O_(2)\rightarrow 2H_(2)(l)$

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

How would you expect energy to change during a chemical reaction? A) Energy will be increased
B) Energy will be converted into another form
C) Energy will be consumed
*THIS IS NOT PART OF A TEST, I GOT THE ANSWER WRONG AND WANT TO KNOW THE RIGHT ONE*

Answers

B. The energy will be converted into another form. In chemical reactions energy is usually changed to heat or light energy. This is an example of the First Law of Thermodynamics which states that energy can not be created or destroyed.

Explain what happens to car tires and the air inside in each of these scenarios.a. Hot summer day:

b. Cold winter day:

Answers

Answer:

They get flat and start to deflate

Explanation:

A: The tires have a better grip of the road, the air becomes less dense

B: Depending on if it rains or snows the tires have less grip, the air becomes more dense

A 93-L sample of dry air is cooled from 145 oC to -22 oC at a constant pressure of 2.85 atmospheres). What is the final volume?

Answers

Answer:

56 L

Explanation:

We're dealing with a gas in this problem. We may, therefore, apply the ideal gas law for this problem:

$pV = nRT$

We now that we have a constant pressure. Besides, R, the ideal gas law constant, is also a constant number. Let's rearrange the equation so that we have all constant variables on the right and all changing variables on the left:

$(V)/(T) = (nR)/(p) = const$