CHEMISTRY HIGH SCHOOL

What unit is used to express the pressure of a gas?(1) mole (2) joule (3) kelvin (4) pascal

Answers

Answer 1
Answer:
The answer is a PASCAL!

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The mass of a substance is 10 grams. In magnitude, the volume is three more than the density, which is measured in g/cm3. What is the density of this substance?

Answers

Answer:

Explanation:

The expression to use to calculate the density of any substance is the following:

d = m/V  (1)

Where:

m: mass (g)

V: Volume (mL or cm³)

Now, we don't have data for the volume of the substance, but the problem states that volume of the substance is three times more than the density, in other words, it means:

V = 3d (2)

With this, we can replace it in (1), and we can calculate the density still:

d = m / 3d  (3)

Solving for d, we have the following:

m = 3d²

d² = m/3

d = √m/3 (4)

All we have to do now, is replace the value of the mass here and solve for density:

d = √10/3

d = √3.33

d = 1.82 g/cm³

This is the density of the substance
you have to use the equation d=m/v. Since we are told that volume is three times that of density, we can write v=3d. Dince we are also told that mass is 10g we can make the equation d=10/3d. That means that 3d^2=10 which can be turned to d^2=3.33. That means that d=1.83g/cm^2. I hope that helps. Let me know if anything is unclear.

Define in your own words: Solute, Solvent and Solution.

Answers

The substance that is being dissolved is called the solute and the substance that does the dissolving is called the solvent. So the solvent dissolves in the solute the forming a solution. 

Describe the motion of a ball being thrown straight up in the air in terms of kinetic and potential energy. as the ball rises up and falls back down, how is its kinectic and potential energy affected?

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In your hand, the ball has higher potential energy than kinetic because it is still off of the ground but it isn't moving so there is no kinetic. As the ball rises, its potential and kinetic energy increases. At its peak, it has very high potential energy and very low kinetic energy. As it falls, the potential energy decreases but kinetic does not.

How much energy is passed to the next trophic level in the food chain?

Answers

Answer:

10%

Explanation:

Out of the original layer, only ten percent is transferred to the next

How do you convert ethane to ethanoic acid? (with equation please).

Answers

Answer :

There are three processes involved in the conversion of ethane to ethanoic acid.

In first process, on the chlorination of the ethane in the presence of the sunlight or in the presence of U.V light, ethane converted into ethyl chloride.

In the second process, ethyl chloride react with the aqueous potassium hydroxide to give ethanol.

In the third process, ethanol react with an oxidizing agent (Alkaline potassium permanganate) to give ethanoic acid.

The reaction are shown below.
Ethane can be turned into its carboxylic acid form called the ethanoic acid by a series of steps. First chlirinate it in the presence of light. Then, add potassium hydroxide to get an alcohol. Finally, adding KMnO4 to oxidize it to a carboxylic acid. The equations are as follows:
C2H6 + Cl2  ---> C2H5Cl + HCl
C2H5Cl+KOH-> C2H5OH+ KCl.
C2H5OH  ----KMnO4 ---> CH3COOH.

PLEASE HELP HURRY (Physical Science)


Use Newton’s Law to explain why a bowling ball will slow down and stop when rolled in a flat surface, like a street.

Answers

Answer:

Force is must to change the velocity of an object. Force is always equal to the mass of the object times its acceleration.

Explanation:

From the second law of Newton, it  states that the force is the product of mass of an object and its acceleration. Here, when the bowling ball is rolling across a flat surface, frictional force acts on it which oppose the motion of the ball and causes deceleration of the ball. This is an example of rolling friction. Acceleration of the bowling ball depends directly to the force of friction and indirectly to its mass.
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