what is the volume of a gas at 2.00 atm and 200.0 K if its original volume was 300.0 L at 0.250 atm and 400.0 K

Answers

Answer 1

Answer: Given:
P1 = 2.00 atm
T1 = 200.0 K
V2 = 300.0 L
P2 = 0.250 atm
T2 = 400.0 K

Required:
V1

Solution:
P1V1/T1 = P2V2/T2
(2.00 atm) V1 / (200.0 K) = (300.0 L) (0.250 atm) / (400.0 K)
V1 = 18.75 L

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Which statement describes a physical property of copper?It reacts with strong acids.
It can be reshaped by a force.
It ignites at high temperatures.
It can combine with oxygen.

Answers

Answer is: It can be reshaped by a force.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change, changing the shape is physical change.

Copper reaction with acid, ignition and combination with oxygen are chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

The correct answer is It can be reshaped by a force

That is because physical properties are ones that don't change the substance when it is physically altered. If copper is physically changed, none of its other chemical properties are influenced.

How does the rule of zero charge help you predict the formula of an ionic compound?

Answers

Overall the ionic compound cannot be charged, so all charges of the ions must be balanced. This means if you know the charge of 1 ion (E.G. Ca2+ ion) and you know the charge of the other ion (E.G. Cl1-) then you can work out that to make the overall charge 0, there must be double the amount of chlorine ions than calcium ions present. From this, you can work out the formula must be CaCl2.

Where are people exposed to chemicals?O A. Mostly in public buildings
O B. Only in the home
C. Mostly outside
O D. Everywhere

Answers

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

Answer:

Explanation:

43. Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?(1) from 400.K to 200.K(2) from 200.K to 400.K
(3) from 400.oC to 200.oC
(4) from 200.oC to 400.oC

Answers

This question may be answered by looking at the equation for ideal gases. The ideal gas equation is pV = nRT. Which implies that If pressure is constant (n is constant if the amount of gas is not changed and R is the Universal Constant of Gases), then V / T is constant. Then if V is doubled T is also doubled. Then the answer is the option (2) from 200K to 400K..

What is a single kind of matter that is pure, having a specific makeup and specific properties? a) Element b) Compound c) Mixture d) Substance

Answers

Answer:

Element

Explanation:

Final answer:

A Substance, either an element or compound, is a single kind of matter that is pure, having a consistent makeup and specific properties. Elements consist of a single type of atom while compounds consist of two or more types of atoms.

Explanation:

The single kind of matter that is pure, having a specific makeup and specific properties is termed as a Substance. A substance can be classified as an element or a compound. Elements consist of only one type of atom and cannot be broken down by a chemical change. On the other hand, compounds consist of two or more types of atoms. It's essential to note that both elements and compounds have a constant composition from point to point, but mixtures don't necessarily maintain the same composition throughout.

Learn more about Substance here:

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In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:N2(g) + 3H2(g) 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
How many grams of Ny must react to form 1.7 grams of ammonia, NH3?
0.052 g
1.49
0.00589
2.8 g

Answers

Answer:

Explanation:

Here we have to use stoichiometry.

First of all, we have to calculate the mass of 100% of yield:

1.7 g ------- 98%

X -------- 100%

X = 1.73 g (approximately)

Second, we have to calculate the mass of N2 that is necessary to react to produce the mass of 1.73g of NH3. To do that, we have to use the Molar mass of N2 and NH3 and don't forget the stoichiometric relationship between them.

Molar Mass N2 : 14x2 = 28 g/mol

Molar Mass NH3: 14 + 3 = 17 g/mol

28g (N2) ------- 17x2 (NH3)

X ------------ 1.73 g

X = 1.42 g (approximately)

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