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

Answer 1

Answer: 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..

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A plate moves south at a rate of 2 cm/year. How many meters south from its original location will the plate be in 4,000 years? 8,000 meters south 4,000 meters south 200 meters south 80 meters south

Answers

The distance (in meters south) the plate will be given that the plate is moving at a rate of 2 cm/year is 80 meters south (last option)

How do i determine the distance?

Speed is defined as distance travelled per unit time. This is mathematically written as

Speed = Distance travelled / time

If we make distance the subject, we have

Distance travelled = Speed × time

The following data were obtained from the question:

Speed of plate = 2 cm/year = 2 / 100 = 0.02 m/year
Time = 4000 years
Distance travelled =?

Distance travelled = Speed × time

Distance travelled = 0.02 × 4000

Distance travelled = 80 meters south

Thus, we can conclude that the distance travelled is 80 meters south (last option)

Learn more about distance travelled:

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the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.

The plate moves south at a rate of 2 cm/year. To find out how many meters south it will be in 4,000 years, we need to convert the years to centimeters and then meters.

In 4,000 years, the plate will have moved: 2 cm/year x 4,000 years = 8,000 cm.

Now, to convert 8,000 cm to meters, we need to divide by 100 (since there are 100 centimeters in a meter):

8,000 cm / 100 = 80 meters.

So, the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.

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Complete question is:

A plate moves south at a rate of 2 cm/year. How many meters south from its original location will the plate be in 4,000 years?

a. 8,000 meters south

b. 4,000 meters south

c. 200 meters south

d. 80 meters south

What is the Mr of Pb(C2H3O2)4

Answers

Answer:

Element Symbol Atomic Mass # of Atoms Mass Percent

Lead Pb 207.2 1 46.732%

Explanation:

When 50. milliliters of an HNO3 solution isexactly neutralized by 150 milliliters of a 0.50 M
solution of KOH, what is the concentration of
HNO3?
(1) 1.0 M (3) 3.0 M
(2) 1.5 M (4) 0.5 M

Answers

Answer : The correct option is, (2) 1.5 M

solution :

According to the neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of $HNO_3$ solution = ?

$V_1$ = volume of $HNO_3$ solution = 50 ml

$M_2$ = molarity of KOH solution = 0.50 M

$V_2$ = volume of KOH solution = 150 ml

Now put all the given values in the above law, we get the volume of $HNO_3$ solution.

$M_1* (50ml)=(0.50M)* (150ml)$

$M_1=1.5M$

Therefore, the concentration of $HNO_3$ is, 1.5 M

The reaction formula is HNO3 + KOH = KNO3 + H2O. The mole number of HNO3 and KOH is the same. So the concentration of HNO3 is 150*0.5/50=1.5 M. So the answer is (2).

What is the oxidation number of iodine in KIO4?(1) +1 (3) +7(2) -1 (4) - 7

Answers

K ( potassium ) = + 1

I ( iodine ) = + 7

O ( oxygen ) = - 2

hope this helps!

PLEASE HELPSusana heats up a sample of red crystals. While the sample is being heated, a gas is released and a blue powder is left after the heating. Is the sample of red crystals an element or a compound? Explain your answer.

Answers

Because more than one substance was released (following a color change signifying a chemical reaction), the sample was indeed, a compound.

Sample response: Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.

This is late but if anyone needs it here you go.

How many protons and electrons are in an atom of sodium whose atomic number is 11?

Answers

Atomic number is also known as proton number, so it would have 11 protons. Assuming you mean a neutral atom, it will have to have an equal number of electrons to protons, so it has 11 electrons too

Final answer:

An atom of sodium, with an atomic number of 11, has 11 protons and 11 electrons. The atomic number is indicative of both the number of protons in an atom and, in a neutral atom, the number of electrons.

Explanation:

The atomic number of an element corresponds to the number of protons in the nucleus of its atom. So, an atom of sodium whose atomic number is 11 has 11 protons. As the atom is neutral, it also means that the atom will have 11 electrons to balance the 11 positive charges of the protons. This information can be found on the periodic table, which gives the atomic number and the atomic mass of each element.