High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressure used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.17x10^8 Pa, what is it’s running pressure in torr?

Equilibrium Constant Calculation
For the reaction A(g) + B(g) 2 C(g) the following equilibrium concentrations were found:
[A(g)] = 0.232 mol/L
[B(g)] = 0.251 mol/L
[C(g)] = 0.750 mol/L
Calculate the value of the equilibrium constant Ke. Give 3 significant figures in your answer.

A bike tire has a volume of 0.850L at a pressure of 40.0 psi and 0.00°C. What will be the
pressure of the tire at 35.0°C?

Bases contain hydroxide, which is a

Which is balanced properly

Which of the following is the most likely impact of clearing natural landscape to construct high-rise buildings?

Decrease in pollution
Scarcity of drinking water
Increase in animal population
Abundance of non-native plants

Task
Determining Heat Gain and Loss
In this activity, you’ll heat an object in hot water and then transfer it to cool water. The object will become cooler, and the cool water will become warmer. Based on the temperature changes, you’ll calculate and compare the heat lost by the object and the heat gained by the water. To begin, choose an object (or objects) made of a known material and that can be immersed in water without causing damage.

Before you begin this task, read these lab safety guidelines. If you’re using an electronic balance, watch this video about measuring mass.

Estimated time to complete: 1 hour

If you’re using an Edmentum lab kit, remove the electronic balance and thermometer from the kit. These materials are italicized in the following equipment list. Then gather any additional items shown in the list. If you’re not using an Edmentum lab kit, alternatives are suggested in parentheses. If you don't have these alternative materials at home, please check with your teacher for help.

You’ll need these materials:

electronic balance (may also use a kitchen scale, readable at least to the nearest gram)
thermometer, readable at least to the nearest degree from 0°C to 100°C (32°F to 212°F)—readings to the nearest tenth of a degree will produce better results
foam cups (2)
lids to fit the cups (may use squares of cardboard as lids)
solid object (or group of objects) of a known material that can fit easily in the cup, ideally having a total mass of 25 to 60 grams; here are some ideas:
2–5 plastic dominoes, depending on size
5–10 glass marbles, depending on size
10 quarters
tongs
pen or marker
stove, hot plate, or microwave oven
container for heating water (depends on the selected heat source)
Part A
Begin the task by performing these steps. Record your observations in the table provided.

Label the foam cups with the numbers 1 and 2.
Record the type (and quantity, if applicable) of object you will be using. Include what kind of material the object is made of.
Determine the specific heat capacity of the chosen object from this list of specific heat capacities. If you can’t locate your material on the list, do an online search.
Use the electronic balance to measure the mass of the chosen object(s). Record the mass. Then, place the object(s) into cup 1.

current is created by the movement of what subatomic particle?

help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Make sure your answer includes TWO decimal places. this is an impossible formula. If it were real, determine the molar mass of:

KBr•7H2O

Explain the relashionship between carbon dioxide, the human population and use of fossil fuels. ​

You are on a camping trip with your family. While you’re toasting marshmallows, one catches on fire.
List three more items that you might have on a camping trip that would burn.
List three items that wouldn’t burn.

Calculate the mass (in grams) of 3.85 x 1024 carbon atoms.

1- If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters, is formed at STP? Be sure to balance the reaction first.
___K(s) + ____H2O(l) → ____KOH(aq) + ____H2(g)

2- The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of sulfur form? Calculate the volume of sulfur dioxide produced at STP.

Define reaction rate.
a. An unstable arrangement of atoms that forms momentarily at the peak of the activation-energy
barrier
b. The minimum energy that colliding particles must have in order to react
c. A measure of speed of any change that occurs within an interval of time
d. Atoms, ions, and molecules can react to form products when they collide with one another,
provided that the colliding particles have enough kinetic energy.

# 16 of Approaching Equilibrium
For the reaction system A₂(g) + B₂(g) = 2AB(g)
the equilibrium constant K= 6.2
A system using this reaction was being tried in a 1.00 L reactor. It was charged with 0.20 mol A2, 0.15 mol B₂ and 0.60
mol AB.
The system was allowed to come to equilibrium. Which statement below describes the system coming to equilibrium?
(Note: in the answers, Q refers to the reaction quotient, K refers to the equilibrium constant).
Select one:
O a. The reaction goes to the right, more products will form because Q < K
O b. The reaction goes to the left, more reactants will form because Q > K
O c. The reaction goes to the right, more products will form because Q > K
O d.
It is not possible to predict in which direction the system will travel to arrive at equilibrium.
e.
The reaction goes to the left, more reactants will form because Q < K

C + 2H2 -> CH4
For the reaction shown here, predict the number of moles of hydrogen gas needed produce 32 grams of methane.
A) 1
B) 2
C) 4
D) 8​

What is the reciprocal of cell constant?​

he density of water is 1 g/mL.

How many times greater is the density of lead if density of lead is 11.3 g/mL?

How many times less dense is the density cork if its density is .24 g/mL?

a 20.0 L container of helium used to fill balloons is at a pressure of 150 atm and a temperature is 30.0 C. How many balloons can be filled to 5.0 L, if the temperature is 22 C and the atmospheric pressure is 1.05 atm?

Name the two geometrical isomer of hydrocarbon

The provided map shows the location of an earthquake under the ocean.

The data on the map would best support a prediction of which of the following events?

O A tsunami in Sri Lanka
O An earthquake in South Africa
O A hurricane in Somalia
O Flash floods in Madagascar

Determine the oxidation number if each atom in the following compunds: sodium chloride and iron(||) oxide.​

An alpha particle is made up of
O one proton and one neutron
Otwo protons and two neutrons
Oone electron
Otwo electrons

Using the solubility curve above, what is the solubility of KBr when the temperature is 80°C?

A) 86 g/100 g water
B) 90 g/100 g water
C) 96 g/100 g water
D) 102 g/100 g water

Oxygen always become negatively charged when it forms covalent bonds true or false?

Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.97584/5.68 = [?]

help me with this one please.
calculate the solubility of AgCl in:
100ml of 4×10^-3M calcium nitrate
(Ksp is = 1.6 ×10^-10)

​

How many moles of sodium chloride (NaCl) are in (4.2x10^-41) molecules of sodium chloride (NaCl)?

Calculate the volume of a 1.50M HCl solution that contains 0.920 mol of HCI. (SHOW WORK)

Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.0030 × 8.65= [?]