CHEMISTRY MIDDLE SCHOOL

What is the kinetic energy of a 1.0-kg billiard ball that moves at 5.0 m/s?

Answers

Answer 1
Answer: Given,
          m = 1 kg
          v = 5 m/s 
We know that 
              K.E.= mv²/2
                     =1×5²/2
                     =25/2
                     =12.5 Joules
The answer is 12.5 Joules

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How many moles of hydrogen gas are generated when 4.0 moles of water react with excess calcium

Answers

Answer:

2moles of H2

Explanation:

First, let us generate a balanced equation for the reaction between calcium and water. This is illustrated below:

Ca + 2H20 —> Ca(OH)2 + H2

From the equation,

2moles of H2O produced 1mole of H2.

Therefore 4moles of H2O will produce = 4/2 = 2moles of H2.

A gas mixture contains 1.61 moles of hydrogen and 2.31 moles of oxygen. What is the mole fraction of oxygen?a) 0.41
b) 0.59
c) 2.31
d) 3.92​

Answers

Answer: option B. 0.59

Explanation:Please see attachment for explanation

How does potential energy of a system change during an endothermic reaction?

Answers

Answer:

Explanation:

During an exothermic reaction bonds break and new bonds form and protons and electrons go from a structure of higher potential energy to lower potential energy. During this change, potential energy is converted to kinetic energy, which is the heat released in reactions. In an endothermic reaction the opposite occurs.

Which of the following is true of an effective scientific model? A.)It seldom needs refining because of its detailed accuracy.
B.)It clearly depicts the particular set of characteristics being modeled.
C.)It is an exact visual representation of the characteristics being modeled.
D.)It is the same size and color as the scientific phenomena being demonstrated.

Answers

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC IDK

A natural sample of neon has a relative atomic mass of 20.2.What is the mass number of the most common type of atom in the sample of neon?

Answers

Neon-20.

If the mass number = 20.2, the most common type of atom is probably neon-20.

Movement of molecules from an area of lower concentration to one of higher concentration with carrier molecules, using energy, is called ______________. A.
osmosis

B.
mitosis

C.
diffusion

D.
active transport

Answers

D. Active Transport is the answer
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