Which of the following statements is true?
A.
Chemical reactions can only absorb thermal energy.
B.
Chemical reactions can neither absorb thermal energy nor release thermal energy.
C.
Chemical reactions can either absorb thermal energy or release thermal energy.
D.
Chemical reactions can only release thermal energy.

Answers

Answer 1

Answer: C. Chemical reaction absorb or release thermal (and sometimes other) energy

Explanation:

Chemical reactions can result in products with more or less chemical energy than the precursors. When products have less chemical energy, the excess is converted to heat (exothermic reaction)

When the products have more chemical energy, heat must be added to make up the difference (Endothermic reaction)

Fireworks are examples of exothermic reactions where the excess is released as thermal, mechanical, and radiant energy. A lit match releases thermal and radiant energy.

Respiration is also an exothermic reaction

C6H12O6 + 6O2 —> 6CO2 + 6H2O + energy

Respiration is the reverse of photosynthesis, an endothermic process. The overall photosynthetic reaction is 6CO2 + 6H2O + energy  —> 6C6H12O6 + 6O2

In this case radiant energy drives the reaction.

The reaction 2H2O —> 2H2 + O2 is an endothermic reaction driven by electrical energy.

Many reactions are reversible and if one is endothermic, the reverse is exothermic e.g. 2H2 + O2 —> 2H2O +energy is the reverse of electrolysis of water, or respiration vs photosynthesis.


Related Questions

If a mother has an AB blood type and her daughter has BB blood type, The dad has
AA blood, the mailman has type AO blood and the neighbor has BO blood. Which one is really the father?
A.the dad
B.the mailman
C.the neighbor
D.none of them

Answers

Answer:

c. neighbor

Explanation:

half the mother, half by fathee

The neighbor.

The blood type of the child is decided by half of each parent’s blood type.

The structure of a water molecule influences its properties and supports its biological significance. Which property of water is correctly paired with its significance?
A. Water is adhesive so it expands when it freezes
B. Water is cohesive so it transports materials
C. Water is polar so it helps to cool the body
D. Water is polar so it acts as a solvent

Answers

C.Water is polar it acts as a solvent

why does an ecosystem have a carrying capacity?​

Answers

Ecosystem has a carrying capacity Because is limited

True or False: If a planet were to stop moving relative to the sun, gravity would draw that planet into the sun.

Answers

Answer:

True

Explanation:

Even though sunlight looks white, what is it really made up of?

Answers

Answer:

White light means your not missing any of the visible color spectrum, so all the colors.

Explanation:

What is one way plants and animals are similar?

Answers

They both have cells

Oxygen-poor blood flows out of the heart and into the lungs. Nutrients and oxygen are sent to other cells and parts of the body. The blood then returns to the heart to begin the process again. Which of the body's systems is the above process describing? Answers (A) -The skeletal system (B)-The digestive system (C)-The respiratory system (D)-The circulatory system

Answers

Answer:

(D)-The circulatory system

Explanation:

lol just did it

and pls give me thanks

The circulatory system is the system which consist of blood vessels, heart, and blood. The main function of this system is the transport of oxygen and minerals to all the cells of body. Thus, the correct option is D.

What is Circulatory System?

The circulatory system of body consists of all the blood vessels, blood and heart. In this system, blood travels through different blood vessels (arteries, veins, and capillaries) in all parts of the body.

The blood is the main fluid of the body that contains hemoglobin protein which is responsible for the transport of oxygen and carbon dioxide in the body. The blood exchanges gases at the surface of alveoli in the lungs and sends the blood to the heart, heart pumps the blood to all the cells of body.

Therefore, the correct option is D.

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Who is credited with creating the first accurate model of DNA? Rosalind Franklin Friedrich Miescher James Watson and Francis Crick Marshall Nirenberg and Heinrich Matthaei

Answers

Answer:

The answer is C

Explanation:

The persons credited by accurate model of DNA are James Watson and Francis Crick.

What is model of DNA?

The molecular models of DNA structures are representations of the molecular geometry and topology of deoxyribonucleic acid (DNA).

First accurate model of DNA

The first accurate model of DNA also known as 3-dimensional double helix structure of DNA, was correctly elucidated by James Watson and Francis Crick.

Thus, the persons credited by accurate model of DNA are James Watson and Francis Crick.

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What is the function and purpose of the proteins embedded in the cell membrane?

Answers

Answer:

The function of the proteins that are embedded in the cell membranes is to transport materials in and out of the cell. Proteins are large sized biomolecules that are also referred to as macromolecules at times. They are made up of large chains of amino acid molecules.

Please mark branliest!

i need help please i need help

Answers

Answer:

what do u need help with?

Explanation:

:P

Which of these best describes the change in population of a country where
the total fertility rate exceeds the replacement fertility rate, without
considering immigration rate, emigration rate, or death rate?

Answers

Answer:

Rising

Explanation:

Picture proof

hiiiiiiiii!!!!!!!! ______-_-

Answers

Answer:

haiiiiiiiiiii :) :) :)

Answer:

.

Explanation:

A lake in Minnesota was thriving with black bass and bluegill. These particular fish build nests on the sandy bottom of the lake. Now, ecologists are finding that over time a layer of humus has slowly been covering the pond. The ecologists are noting that the populations of black bass and bluegill are declining, and the fish that are able to make nests in humus are rising in numbers.
The ecologists can probably conclude that this event is an example of:
commensalism
parasitism
primary succession
succession

Answers

Answer:

Explanation:

https://quizizz.com/admin/quiz/5c9100e1202f89001c843569/stages-in-aquatic-ecological-succession

The event described, where a layer of humus covers the sandy bottom of the lake and affects the fish populations, is an example of succession.

Succession is the process of ecological change over time in a particular area. It involves a series of predictable and sequential changes in the composition and structure of an ecosystem.

In this case, the gradual accumulation of humus, a layer of decomposed organic matter, is altering the habitat conditions in the lake.

The decline in the populations of black bass and bluegill, which build nests on the sandy bottom, can be attributed to the changing habitat.

The humus layer is likely making it difficult or impossible for these fish to construct their nests. On the other hand, fish that are capable of making nests in humus, possibly adapted to this type of substrate, are increasing in numbers.

Therefore, the observed changes in fish populations and the altered habitat due to the accumulation of humus indicate a shift in the ecological community over time, which is a characteristic of succession.

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A student observers melting crayons. Which of the following describes what they saw? A. A chemical change. B. A physical change. C. A physical property. D. A chemical property

Answers

Answer: A physical change

Explanation: since the melted they are still Crayons. You can freeze it and it would still be a crayon. So it was only a physical change

Why is cooperative binding of hemoglobin adaptive?

Answers

For example, when an oxygen atom binds to one of hemoglobin's four binding sites, the affinity to oxygen of the three remaining available binding sites increases; i.e. oxygen is more likely to bind to a hemoglobin bound to one oxygen than to an unbound hemoglobin.

can someone please help me figure this out! due in 10 mins!! 20 POINTS!!!!

Answers

NNN all this math gon make me act up

Work divided by time is the formula for- (W = T)
O Force
Work
Power
Energy

Answers

Answer:

Power

Explanation:

The formula work divided by time is the expression for finding the power consumed or expended by a body.

Power is  defined as the rate at which work is done.

    Power  = [tex]\frac{work done}{time taken}[/tex]  

 The unit is always expressed in watts and symbolized as W

Work done is force applied to move a body through a certain distance.

potato plants also produce flowers and reproduce sexually how does being able to reproduce asexually benefit the plant​

Answers

Being able to reproduce asexually benefits the plant because the plant will mature much faster than a plant the produces sexually.

14. Why doesn't the inner core have convection?

Answers

Answer:

The inner core has subsequently been growing at the rate of around 1mm a year as iron crystals freeze and form a solid mass. The heat given off as the core cools flows from the core to the mantle to the Earth's crust through a process known as convection.

Explanation:

I hope this helps you.

List some examples of how populations affect each other.

Answers

If one population dies out, all the populations that depend on that species for food may also die out. A change in one population affects the entire community because all the populations of a community depend on each other.

1-2 Paragraphs About The Background Of Reaction Time Slowing Down Once You Get Older

Answers

Answer:

Reaction times slow with age, and they correlate with scores on tests of higher cognitive functions many of which also deteriorate with age. The age-related changes in reaction times account for a substantial proportion of the age-related variance in higher cognitive functions (e.g., Deary, 2000. 2000Reflexes do slow with age. Physical changes in nerve fibers slow the speed of conduction. ... But the effect of age on reflexes and reaction time varies greatly from person to person. You can actually slow down—even reverse—the effects of aging by staying physically active.The next time some twenty-something complains that they feel old, you can reassure them that their feelings are, in fact, not ridiculous. After studying 3,305 people ages 16 to 44, researchers found that the brain's response time begins to decline at age 24.

Explanation:

Janelle thinks that genetic engineering could be used to
make a larger fruit rather than cloning the fruit. Which would best support her point of view? A. Genetic engineering does not cost as much.
B. Genetic engineering does not result in genetically identical organisms. C. Genetically engineered foods never cause allergies in people. D. Genetically engineered foods have not been modified.

Answers

Genetic engineering  is the process by which scientists choose a particular group of genes and insert them into an organism in such a way that the resulting features will be beneficial to the organism. Therefore, option (B) is correct.

What is genetic engineering?

The modification and manipulation of an organism's genes through technology is known as genetic engineering, often referred to as genetic modification or genetic manipulation.

Genetic engineering, often known as genetic alteration, is a technique that modifies an organism's DNA using technology developed in labs. This could entail altering a single base pair (A-T or C-G), erasing a section of DNA, or incorporating new DNA. Therefore, option (B) is correct.

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Answer:b

Explanation:

An elephant is a multicellular organism that weighs about 200 pounds at birth and can grow to weigh as much as 15,000 pounds. What increases as the elephant grows into an adult?

The collection of water in each cell


The amount of energy in its cells


The size of each body cell


The number of cells i

Answers

Answer:

D?

Explanation:

Im assuming the last one is "The number of cells in its body". If so, that is the right one.

There are ________________________ amendments to the Constitution.

Answers

Answer:

27 amendments as of 2020

Explanation:

Hope i helped!

If a population has low death rates and high life expectancy which end of the population pyramid will increase?

Answers

Answer: "Constrictive" pyramid

[ I hope my answer is correct]

I GIVE BRAINLIEST !!

Please help with this question! Tell how you know, Question worth 20 points!

Answers

Answer:

D

Explanation: It is the best answer to choose and most correct.

in a flower sperm is made by the filament pistil ovary or anther

Answers

Answer:

It is the anther.

Explanation:

The anther is comparable to the make testis. These give rise tomale sperm cells.

Different land areas of the United States grow different crops because

Answers

Different land areas of the United States grow different crops because some crops can't be grown everywhere. For example some plants can survive the winter while others can't.

Can someone help me write a short speech for this? I’ll give brainliest

Answers

Answer:

I sure hope this helps you!

Explanation:

Flying through the air I feel in need of food. Down under me is a beautiful ocean. On that oceans surface, there are lots of phytoplankton. Enough for me, enough for my family. This phytoplankton down under me has lived its life, eaten other organisms, and those organisms eat organisms. Now, is my turn. Tis the circle of life, they eat, I eat. Someday, something will eat me. Eating is very important to the living kind. It helps us stay healthy and alive. This, is my story of The Importance of Upwelling.

IN YOUR OWN WORDS explain how cell differentiation creates the different cells in a multicellular organism.

Answers

Answer:

A multicellular organism develops from a single cell (the zygote) into a ... tissue and organ development, and cell differentiation (gaining a final cell type identity). ... To function correctly, that body needs well-defined axes (such as head vs. tail). ... Mature cell types of the body, like neurons and liver cells, express different sets

Explanation:

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