CHEMISTRY HIGH SCHOOL

Electrons are emitted from a conductor when the conductor is A. bombarded by high-speed electrons.
B. cooled rapidly.
C. subjected to a small voltage.
D. exposed to weak light.

Answers

Answer 1
Answer:

Answer:

A. bombarded by high-speed electrons.

Explanation:

Conductors are materials that allows current to pass through them.

However, the flow of current is actually the flow of electrons in the opposite direction.

When a conductor is bombarded by by high-speed electrons, the high speed electrons will repel the electrons in the conductor (in electromagnetism, like charges repel) thus giving them the required kinetic energy to leave the surface of the conductor.
Answer 2
Answer: A. bombarded by high-speed electrons.
Electrons are emitted from a conductor when the conductor is bombarded by high-speed electrons. This is because the electrons that are already present in the object especially when the object receiver is a metal, water or any object able to conduce electricity, the electrons in these objects are in form of potential energy and when other electrons are in contact with them they move and thus being from potential to kinetic.

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What are three types of fossil fuels?

Answers

The three types of fossil fuels are coal, oil and natural gas.

What is the gram formula mass of Ca3(PO4)2

Answers

Mass Molar of Ca_(3) (PO_4)_2
Ca = 3*40 = 120 amu
P = 2*31= 62 amu
O = (16*4)*2 = 64*2 = 128 amu
--------------------------------------
Mass Molar of Ca_(3) (PO_4)_2 = 120 + 62 + 128 = 310 g/mol

Therefore: What is the gram formula mass of Ca3(PO4)2 ?
Answer: 310 grams

How many hydrogen atoms are represented in the formula (CH3)2CH2?

Answers

7  ..... i think because in CH3 there would be 3 H atoms while in 2CH2 there would be four 

3 clues that indicate a chemical change

Answers

Change of energy or temperature.
 Light, heat or sound is released.
Change of color or odor through the formation of gases.

The reaction between an organic acid and an alcohol produces(1) an aldehyde (3) an ether
(2) a ketone (4) an ester

Answers

Answer : The correct option is, (4) an ester.

Explanation :

As we know that an organic acid is an organic compound that has the properties of an acid. For example : Acetic acid.

And the alcohol is an organic compound that contains one or more hydroxyl groups attached to a carbon atom. Fro example : Ethanol.

When an organic acid react with an alcohol the it produces an ester.

For example : when an organic acid (acetic acid) react with an alcohol (ethanol) to gives an ester (methoxyethane).

The balanced chemical reaction will be,

CH_3COOH+CH_3OH\rightarrow CH_3C-O-O-CH_3+H_2O

Hence, the reaction between an organic acid and an alcohol produces an ester.
The reaction between an organic acid and an alcohol produces an Ether.

What mass of K2SO4 would you need to prepare 1500g of 5.0% K2SO4 (m/m) solution?

Answers

To solve this we must be knowing each and every concept related to mass. Therefore, mass of K_2SO_4 would you need to prepare 1500g of 5.0% K_2SO_4  (m/m) solution is 75 g.

What is mass?

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mass of solution = 1500 g

5.0 % = 5.0 / 100 = 0.05

mass percentage  = mass of solute / mass of solution

substituting all the given values in the above equation, we get

0.05 = mass of solute / 1500

mass of solute   = 0.05 x 1500

mass of solute = 75 g of solute

Therefore, mass of K_2SO_4 would you need to prepare 1500g of 5.0% K_2SO_4  (m/m) solution is 75 g.

To learn more about mass, here:

brainly.com/question/28704035

#SPJ2
Mass of solute = ?

Mass of solution = 1500 g

5.0 % = 5.0 / 100 = 0.05

w  = mass of solute / mass of solution

0.05 = ? / 1500

w = 0.05 x 1500

w = 75 g of solute

hope this helps!
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