CHEMISTRY HIGH SCHOOL

Any reaction that absorbs 150 kcal of energy can be classified asa. activated.
b. exothermic.
c. oxidation.
d. endothermic

Answers

Answer 1
Answer: The answer should be (D) endothermic reaction.

Reason : -  Reactions in which energy is absorbed are called endothermic reactions. In your provided question, 150 kcal energy is being absorbed, and thus, we can say that it is an endothermic reaction. 

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Which of the following is the best example of heat being. Transferred by conduction

Answers

A metal spoon being placed in a boiling pot

The speed in which the moon orbits the earth is 500 mph.

a. True
b. False

Answers

Answer: False

Explanation: The moon travels at 1.42 mph around the Earth.

Answer:

false

Explanation:

Chemical changes do not form new compounds

do not decompose the old compounds

form new compounds

change the appearance of the old compounds

Answers

The correct answer is that chemical changes form new compounds. Chemical change is a change where the substance changes in identity or form new substances after undergoing a process. On the other hand, a physical change is a change in the properties of matter that does not change the identity of the substance. 

How is the size of the mineral grains affected by the rate at which molten rock material cools?

Answers

The rate at which molten rock material cools affects the size of the mineral grains. The longer it cools, the larger the crystals become.

What is mineral?

  • A mineral is a naturally occurring substance that has distinct chemical and physical properties, composition, and atomic structure.
  • An economic mineral is a broader term that includes minerals, metals, rocks, and hydrocarbons (solid and liquid) extracted from the earth through mining, quarrying, and pumping.
  • A mineral exists as inorganic element or compound that occurs naturally and has an orderly internal structure as well as a distinct chemical composition, crystal form, and physical properties.
  • Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals. Minerals are elements found on the earth and in foods that our bodies require for normal development and function.
  • Calcium, phosphorus, potassium, sodium, chloride, magnesium, iron, zinc, iodine, chromium, copper, fluoride, molybdenum, manganese, and selenium are all necessary for good health.

To learn more about mineral, refer to:

brainly.com/question/15844293

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When a mineral cools very quickly, the grain size will be tiny. When a mineral cools very slowly, the grain size will be large.

Nonrenewable energy sources _____.can be quickly replenished
are easily recycled
can eventually be used up
never cause pollution

Answers

Non-renewable energy sources CAN EVENTUALLY BE USED UP.

Non renewable energy sources refer to those energy sources that can not be replenished. Once they are used up, new one can not be formed or produced, this is because they can only be formed by natural processes and these processes take millions of years to occur. Examples of non renewable energy sources are: coal, natural gas and oil. All the fuels obtained from fossils are non renewable in nature.

Answer:

The correct answer is option C, can eventually be used up

Explanation:

Nonrenewable energy sources are those resources which if once used cannot be re used again.  

For example – Coal, petroleum(petrol & diesel), fossils, natural gas etc.  

These resources cannot be replenished if once they are consumed as they take millions of year to form.

Also all these resources are made up of hydrocarbons thus they produce polluting gases on burning except natural gas.  

Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.5 × 10^-4. Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is
4.5 × 10^-4.

Answers

HNO2 =====> H+ + NO2-
Initial concentration = 0.311
C = -x,x,x 
E = 0.311-x,x,x

KNO2 ====>K+ + NO2- 
Initial concentration = 0.189 
C= -0.189,0.189,0.189 
E = 0,0.189,0.189
 
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