Answers
Answer:
The external atmospheric pressure decreases and so does the boiling point of the liquid.
Explanation:
We know that pressure decreases with height. Thus atmospheric pressure decreases at higher elevation.
The implication of this is that, if I take a liquid from sea level to a higher elevation, the external atmospheric pressure on the liquid will decrease and so does its boiling point.
Hence, the liquid boils at a lower temperature when placed at a higher elevation. For this reason, the boiling point of a liquid is lower on the mountain.
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Which of the following describes a way in which chemistry affects how youuse a computer?A. The colors in the computer display are the result of substancesthat glow.B. By clicking a mouse, you can select an object or text on acomputer screen.C. Eye stress can be reduced by sitting a certain distance from theScreen.D. You are able to play video games by moving your body instead of ajoystick
The reform reaction between steam and gaseous methane () produces "synthesis gas," a mixture of carbon monoxide gas and dihydrogen gas. Synthesis gas is one of the most widely used industrial chemicals, and is the major industrial source of hydrogen. Suppose a chemical engineer studying a new catalyst for the reform reaction finds that liters per second of methane are consumed when the reaction is run at and . Calculate the rate at which dihydrogen is being produced. Give your answer in kilograms per second. Round your answer to significant digits..
Determine the number of moles of oxygen atoms in each of the following.1) 4.93 mol H2O22) 2.01 mol N2O
A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half-life for 238U 206Pb is 4.5 109 yr.)
Answers
Answer:
The new volume of the balloon is 539 L
Explanation:
As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide less times per unit time against them. This means that the pressure will be less because it represents the frequency of gas strikes against the walls. In this way, pressure and volume are related, determining Boyle's law that says:
"The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure"
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
o P * V = k
Having an initial state 1 and an final state 2 will be fulfilled:
P1 * V1 = P2 * V2
So, in this case, you know:
- P1= 760 mmHg
- V1= 200 L
- P2= 282 mmHg
- V2= ?
Replacing:
760 mmHg*200 L= 282 mmHg*V2
Solving:
V2=539 L
The new volume of the balloon is 539 L
Answers
Answer:
pH of Buffer Solution 5.69
Explanation:
Mole of anhydrous sodium acetate =
=
= 0.18 mole
100 ml of 0.2 molar acetic acid means
= M x V
= 0.2 x 100
= 20 mmol
= 0.02 mole
Using Henderson equation to find pH of Buffer solution
pH = pKa + log
= 4.74 + log
= 4.74 + log 9
= 5.69
So pH of the Buffer solution = 5.69
Answers
Answer: The new concentration of the solution is 0.143 M.
Explanation:
Given: = 300.0 mL,
= 0.335 M
= 700.0 mL,
= ?
Formula used is as follows.
Substitute values into the above formula as follows.
Thus, we can conclude that the new concentration of the solution is 0.143 M.
Final answer:
To find the new concentration of the solution, you can use the formula C1V1 = C2V2. Plugging in the given values, the new concentration of the solution is 0.144 M.
Explanation:
To find the new concentration of the solution, we can use the formula:
C1V1 = C2V2
Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
Plugging in the given values, we get:
(0.335 M)(300.0 mL) = C2(700.0 mL)
Solving for C2, we find the new concentration of the solution to be 0.144 M.
Learn more about concentration of a solution here:
#SPJ11
Answers
Answers
Answer:
Average atomic mass = 19.9 amu
Explanation:
Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).
Given the following data;
Relative abundance of Z-19 = 55%
Relative abundance of Z-21 = 45%
Atomic mass of Z-19 = 19 amu
Atomic mass of Z-21 = 21 amu
To find the average atomic mass;
Average atomic mass = 19 * (55/100) + 21 * (45/100)
Average atomic mass = 19*0.55 + 21*0.45
Average atomic mass = 10.45 + 9.45
Average atomic mass = 19.9 amu
Therefore, the average atomic mass for element Z is 19.9 amu.
Question 3 options:
34.05 amu
31.03 amu
30.02 amu
15.01 amu
Answers
Answer: 34.05
Explanation:
2N and 6H = abt 34