CHEMISTRY HIGH SCHOOL

Which term describes a substance that increases the concentration of hydroxide ions in solution?Lewis definition of an acid
Arrhenius definition of a base
Bronsted-Lowry definition of a base
Bronsted-Lowry definition of an acid

Answers

Answer 1
Answer: Since the question pertains to hydroxide ions, or OH-, then we can be sure that the answer is a base. All we have to do is differentiate which of the definition is more appropriate. A Bronsted-Lowry base is defined as the substance that accepts a proton. An Arrhenius base is the substance that produces OH- during the acid-base reaction. Hence, the answer is Arrhenius definition base.
Answer 2
Answer:

Answer

its B

Explanation:

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When two atoms combine by transferring electrons, it is a(n) _____ bond.
ionic
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Answers

The correct answer is an ionic bond

Identify each of the following as either a physical change or a chemical change. Explain your answers.A. a piece of wood is sawed in half.
B. milk turns sour.
C. melted butter solidifies in the refrigerator.

Answers

A. physical
B. Chemical 
C.Physical

Answer:

A would be Physical

B would be Chemical

and C would be Physical

Explanation:

A would be physical because the wood is physically changing

B would be chemical because it's still milk but it now had clumps called curds and a very sour taste

C would be physical because the melted butter is physically changing from melted butter to solid butter.

Hope this helps.

During which process is water produced?a. alcohol fermentation
b. acetyl CoA formation
c. electron transport chain
d. citric acid cycle

Answers

The answer is C. It is the electron transport chain reaction that produces water as one of it product. This type of reaction is the final and essential step in cell respiration. It's main function is to produce ATP but another product is also produced which is water. 

Answer:

The answer to this problem is c

Explanation:

At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.07 m by 3.00 m by 3.77 m? Answer in units of kg.

Answers

1 ml = 1 cm3
The volume of the room is 34.7217 m3 or 34.721.700 cm3, so 34.721.700 * 0.001184 g/cm3= 41,1104928 kg.

Fluorine has 7 valence electrons. How many more electrons does it need to acheive a full outermost energy levela
1
3
Ob
Oc
O d
10
2

Answers

One, because of the octet rule, every element wants to be like the noble gases, have a full shell, which is 8 electrons.

A gas is initially at a pressure of 225 kPa and a temperature of 245 K in a container that is 4.5 L. If the gas is compressed to a volume of 2.1 L and the temperature changes to 275 K, what is the new pressure?

Answers

Use the ideal gas equation PV=nRT. You can compare before and after using P1V1/n1T1=P2V2/n2T2. Since the number of moles remains constant you can disregard moles from the equation and use pressure, volume and temp. Make sure your pressure is converted to atmospheres, your volume is in liters, and your temperature is in kelvins.
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