CHEMISTRY
HIGH SCHOOL

Answer: Astronomers use the Doppler effect to measure the frequency of light waves as an object is moving with respect to the observer

MIDDLE SCHOOL

Velocity Equation Practice: 1. If a westbound train has gone 359 miles in 5 hours, what is the velocity of the train?

You would take the change in displacement or distance (359 miles minus 0) and divide it by the change in time (5 hours minus 0)... your answer is 71.8 m/s

Answer:

v=359 mi/5 hours=71.8

Explanation: miles per hour

MIDDLE SCHOOL

What is the name of PdPO4

The name of PdPO4 is Palladium Phosphate. Good luck.

HIGH SCHOOL

In addition to decreasing the amount of fat in a dish, salsa can also increase the amount of A. vitamin C and fiber.

B. calcium and phosphorus.

C. calories and cholesterol.

D. sodium and cholesterol.

Its c ok im sorry if i got the last answer wrong

MIDDLE SCHOOL

Raw meat can spread pathogens. Which statement describes the best way to prevent the spread of foodborne illness? A. Use a paper towel to wipe off everything that the meat touched.

B. Rinse your knives and cutting board with water.

C. Wash your hands, utensils, and surfaces with hot soapy water.

D. Continue cooking and assume that pathogens did not spread.

C.) wash hands, utensils, and surfaces with hot soapy water

A. Use a paper towel to wipe off everything that the meat touched

HIGH SCHOOL

A 3.682 g sample of kclo3 is dissolved in enough water to give 375. ml of solution. what is the chlorate ion concentration in this solution?

Answer: The chlorate ion concentration in the solution is 0.080 M

Explanation:

To calculate the molarity of solution, we use the equation:

We are given:

Mass of solute (potassium chlorate) = 3.682 g

Molar mass of potassium chlorate = 122.55 g/mol

Volume of solution = 375 mL

Putting values in above equation, we get:

The chemical equation for the ionization of potassium chlorate follows:

1 mole of potassium chlorate produces 1 mole of potassium ions and 1 mole of chlorate ions

So, concentration of chlorate ions in the solution = 0.080 M

Hence, the chlorate ion concentration in the solution is 0.080 M

MKClO₃: 39g+35,5g+(16g×3) = 122,5 g/mol

1 mol -- 122,5g

X mol -- 3,682g

X = 3,682/122,5

X = 0,03 mol

375 ml = 0,375 l = 0,375 dm³

C = n/V

C = 0,03/0,375

C = 0,08 mol/dm³

[ClO₃-] = [KClO₃] = 0,08 mol/dm³

1 mol -- 122,5g

X mol -- 3,682g

X = 3,682/122,5

X = 0,03 mol

375 ml = 0,375 l = 0,375 dm³

C = n/V

C = 0,03/0,375

C = 0,08 mol/dm³

[ClO₃-] = [KClO₃] = 0,08 mol/dm³

HIGH SCHOOL

How do thermal energy and intermolecular forces behave with each other?

When there is more thermal energy, there are less intermolecular forces. I hope this answers your question ☺️☺️

MIDDLE SCHOOL

Kinetic molecular theory says that as water molecules absorb energy, their motion and temperature __________ and the sample becomes ___________.

increases and hotter

MIDDLE SCHOOL

Mg + HCI = MgCI2 = H2

The correct balanced equation is :

Mg+2HCl->Mgcl2 +H2

MIDDLE SCHOOL

Warm air rises and takes heat with it; eventually it cools and sinks describes how heat is transferred by convection. A. True

B.False

The answer is True. Convection is the term describing how heat rises and cold sinks. The definition of convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises

The correct answer would be A

Hope this Helped!