Describe how activity within the earth results in earthquakes

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Answer 1

Answer: When the plates either move together, apart or slide beside each other

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What will happen to the volume if the amount of a gas is decreased at constant temperature and pressure?

Answers

To predict the changes, we first that this gas is ideal. An ideal gas i when the molecules of the gas occupy a negligible volume and have no interactions with one another. The conditions of this gas can be calculated by the use of the Ideal Gas equation which is expressed as: PV=nRT. If this gas is at a constant temperature and pressure and the amount is decreased then the volume will most likely decrease as well.

Which solution has the same boiling point as 0.25 mol CaCl2 dissolved in 1000 g water?Help Please, Thanks!

0.75 mol sucrose dissolved in 1000 g water
1.0 mol ethylene glycol dissolved in 1000 g water
0.50 mol CaCl2 dissolved in 1000 g water
0.25 mol NaCl dissolved in 1000 g water

Answers

The boiling point of water at 1 atm is 100 degrees celsius. However, when water is added with another substance the boiling point of it rises than when it is still a pure solvent. This called boiling point elevation, a colligative property. The equation for the boiling point elevation is expressed as the product of the ebullioscopic constant (0.52 degrees celsius / m) for water), the vant hoff factor and the concentration of solute (in terms of molality).

ΔT(CaCl2) = i x K x m = 3 x 0.52 x 0.25 = 0.39 °C
ΔT(Sucrose) = 1 x 0.52 x 0.75 = 0.39 °C
ΔT(Ethylene glycol) = 1 x 0.52 x 1 = 0.52 °C
ΔT(CaCl2) = 3 x 0.52 x 0.50 = 0.78 °C
ΔT(NaCl) = 2 x 0.52 x 0.25 = 0.26 °C

Thus, from the calculated values, we see that 0.75 mol sucrose dissolved on 1 kg water has the same boiling point with 0.25 mol CaCl2 dissolved in 1 kg water.

You fill a balloon with 2.50 moles of gas at 25°C at a pressure of 1.49 atm. What is the volume of the balloon?

Answers

You need to use the ideal gas equation:

$PV = nRT$

P is pressure (in atm or bar)

V is volume (in L)

n is the number of moles (in mol)

R is an experimentally determined ratio of about 0.82

T is the temperature (in Kelvin)

Note: For all gases, you need to convert Celsius or Fahrenheit to Kelvin.

$25C + 273.15 = 298.15K$

Get V alone.

$V = (nRT)/(P)$

Plug in the values you have.

$V = (2.50 mol * 0.82 * 298.15 K)/(1.49 atm)$

you get:

$V = 611.2075L$

A fun fact: the gas used to fill up a balloon is Helium.

HELP ASAPFor the reaction 2H2(g) + S2(g)<---> 2H2S(g), determine the equilibrium constant at 700oC if at this temperature, the equilibrium concentrations are as follows:
[H2] = 0.208 M, [S2] = 1.13 × 10-6 M , [H2S] = 0.725 M
A) 1.08 × 107
B) 3.49
C)4.55 × 10-7
D)3.22 × 106
E)441

Answers

Equilibrium constant of a reaction is the ratio of concentrations of the products and the reactants when the reaction is in equilibrium. This value is independent of the concentrations since the conditions are at equilibrium instead it depends on ionic strength and temperature.

First, we write the equilibrium expression.

K = [H2S]^2 / [H2]^2 x [S2]
K = (0.725^2) / [(0.208^2) (1.13 x 10^-6)]
K = 10751545.56 or 1.08 x 10^7

Thus, the answer is A.

Plants perform photosynthesis during the night

only during an eclipse

only when the sun is not out

during the day

Answers

The correct answer is the fourth option. Plants perform photosynthesis during the day. Photosynthesis is the process in plants to make their food. This involves the use carbon dioxide to react with water and make sugar or glucose as the main product and oxygen as a by-product.

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg?

Answers

The balanced reaction is:

Mg (s) + 2HCl (aq) = H2 (g) + MgCl2 (aq)

We are given the amount of reactants to be reacted. This will be the starting point of the calculations.

.125 L HCl solution (6.0 mol HCl / L solution) ( 1 mol H2 / 2 mol HCl ) ( 2.02 g H2 / 1 mol H2 ) = 0.76 g H2

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