CHEMISTRY MIDDLE SCHOOL

A bob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. What is the balue of the kinetic energy gained by the bob at the ground level?

Answers

Answer 1
Answer:

K.E = mgh at bottom

K.E = 0.18*10*45

K.E = 81J

K.E at the bottom will be equal to P.E at hight.

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Given the balanced equation representing a reaction:Al2(SO4)3 +6NaOH ==> 2Al(OH)3 + 3Na2SO4 The mole ratio of NaOH to Al(OH)3 is (1) 1:1 (2) 3:1 (3) 1:3 (4) 3:7
Choose all the answers that apply.The scientific method _____.1. is always exactly the same in all areas of science2. can be used to organize scientific investigation3. begins with communication4. is a logical series of steps5. answers all questions
How many moles of carbon dioxide gas can formed formed the combustion of 4 moles of c5h14
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The atomic number of the sodium atom is 11. The atomic mass number can be estimated by rounding the atomic mass to 23. From this information, you can find the number of neutrons: 11 protons plus how many neutrons equals a mass number of 23? The number of neutrons would have to be the difference between 23 and 11, which is 12. This fact can be restated this way: 11 protons plus 12 neutrons equals a mass number of 23. For every proton in the nucleus, an electron revolves around the nucleus. Since 11 protons are in sodium, 11 electrons must be in sodium.The atomic number of the chlorine atom is 17. The atomic mass number can be estimated by rounding the atomic mass to 35. From this information, you can find the number of neutrons, protons, and the number of electrons.

1. How many neutrons are in the chlorine atom?
2. How many electrons are in the chlorine atom?
3. How many protons are in the chlorine atom?

Answers

Answer:

1. 18 neutrons

2. 17 electrons

3. 17 protons

Answer:

1. 18 neutrons

2. 17 electrons

3. 17 protons

Explanation:

Write a balanced equation for double replacement of KOH+ZnCl2

Answers

Answer :

Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as  a product.

AB+CD\rightarrow AD+CB

In this, A and C are the cations and B and D are the anions.

When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.

The balanced chemical reaction is,

KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl

Why is it that the north star is the only star in the night sky that seems to stay still

Answers

I think it is because it is directly about the north or south pole (I forget) so while all the other stars seem to rotate around because the Earth is rotating but the North Star is directly in the center. Don't take my word though.

The term 'electron cloud' describes the Bohr model's location of electrons.
TRUE
FALSE

Answers

TRUE.

In 1922 Niels Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.

Which of the following is the correct definition of convection?A. the transfer of heat by currents

B. the transmission of heat across matter

C. the electromagnetic radiation from the surface of an object which is due to the object's temperature

D. the transmission of heat across empty space

Answers

Answer: A. the transfer of heat by currents

Explanation: There are three modes of heat transfer:

1) Conduction: This type of heat transfer happens when there is direct contact between the two object.  Example: heating a pan on stove.

2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.

3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space. Example: Heating of earth's surface.

B. The transmission of heat across matter is conduction.

C. The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation.

D. The transmission of heat across empty space is radiation.

Answer:

A: The transfer of heat by currents.

Explanation:

Convection is the transfer of heat by currents, typically within a liquid or a gas. When heat is transferred by convection, matter flows.

Democritus said that ____ were indivisible, fundamental units of matter

Answers

Answer:Atoms

Explanation: Democritus defined ATOMS as the indivisible, indescructible fundamental units of matter.

Answer:

atoms, the smallest pieces of elements that still retain their properties.

Explanation:
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