Mrs. Johnston heated 5 grams of sugar. The sugar first looked shiny, and then it melted and became dark brown. Finally, all that was left was a black, shiny residue. She then heated 5 grams of sand in the same way. The sand’s appearance did not change.

What explains these results? a Sand is an element, but sugar is a compound.
b Heating the sugar caused a chemical change.
c Heating the sand caused a chemical change.
dHeat only caused physical changes in both the sand and sugar.

Answers

Answer 1

Answer:

B

Explanation:

Heating the sugar causes it to burn, thereby inciting a chemical change in the glucose molecules.


Related Questions

What are two ways to increase the energy of a wave?
•Increase the wavelength and increase the frequency

Increase the amplitude and increase the frequency

Decrease the amplitude and increase the wavelength

Increase the speed and decrease the frequency

Answers

The two ways to increase the energy of a wave are to: Increase the amplitude and increase the the frequency. Hope this helps and pls mark brainliest or give thanks!!

The two ways to increase the energy of a wave are increase the amplitude and increase the frequency. The correct option is B.

What is a wave?

A wave is a propagating dynamic disturbance of one or more quantities in physics, mathematics, and related fields.

Periodic waves occur when quantities oscillate repeatedly about an equilibrium value at some frequency.

The amplitude and frequency of a wave are related in such a way that they are inversely proportional. With increasing frequency, the amplitude decreases. As the frequency decreases, the amplitude increases.

The amount of energy in a wave is determined by its height, wavelength, and the distance over which it breaks.

When equal wavelengths are used, a wave with a larger amplitude will release more energy when it returns to sea level than a wave with a smaller amplitude.

Thus, the correct option is B.

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Which of the following best describes the impact that infectious agents in one's surroundings can have on the health of an individual?

a
They can bind with T cells and cause swelling and inflammation.

b
They can attack within cells and elicit a cell-mediated immune response.

c
They can destroy the body's ability to fight infection after repeated exposure.

d
They can produce histamine and prevent body cells from reproducing.

Answers

The correct answer is D to this question

The impact that infectious agents in one's surroundings can have on the health of an individual is they can produce histamine and prevent body cells from reproducing.

What are the functions of histamine?

Histamine is an important chemical that has a role in a number of different bodily processes. It stimulates gastric acid secretion, plays a role in inflammation, dilates blood vessels, affects muscle contractions.

Histamine is a central mediator released from mast cells through allergic reactions. Histamine plays a role in airway obstruction via smooth muscle contraction, bronchial secretion, and airway mucosal edema.

Histamine regulates a plethora of pathophysiological and physiological processes, such as secretion of gastric acid, inflammation, and the regulation of vasodilatation and bronchoconstriction.

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What function are stomach cells adapted for

Answers

Answer:

The stomach is J-shaped and it can expand to temporarily store food. Partial digestion of the food takes place here. The churning action of the stomach muscles physically breaks down the food. The stomach releases acids and enzymes for the chemical breakdown of food.

Explanation:

What makes up the highest percentage of soil composition?
A.) Mineral matter
B.) Water
C.) Air
D.) Organic matter

Answers

Answer:

D

Explanation:

^

The one that makes up the highest percentage of soil composition is mineral matter. The correct option is A.

What is soil composition?

In soil science, a soil type is a taxonomic unit. A distinct soil type is formed by all soils that share a specific set of well-defined properties.

Soil type is a technical term for soil classification, which is the science of systematic categorization of soils. Every soil on the planet belongs to a specific soil type.

The composition of the soil is an important aspect of nutrient management. Soil water is what readily provides nutrients for plant uptake, whereas soil minerals and organic matter hold and store nutrients.

A typical soil contains about 45% mineral matter, 5% organic matter, 20-30% water, and 20-30% air. These percentages are, at best, broad strokes.

Thus, the correct option is A.

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URGENT!!
In addition to water, which of the following substances are polar?

A. Oil
B. Sharpie Marker
C. Butter
D. Nail Polish
E. Sugar

Answers

Answer:

Sugar

Explanation:

Sugar is the only polar substance here

Answer:

E: sugar

Explanation:

Fats and oils are nonpolar so its not oils or butter.

Most inedible or permanent inks like sharpie are nonpolar so its not sharpies.

Nail polish has a number of ingredients one is resin, which is nonpolar. The answer is sugar.

Every population is part of a ___?
Help plz!! I'll mark brainliest!

Answers

Answer:

In statistics, a population is the entire pool from which a statistical sample is drawn. A population may refer to an entire group of people, objects, events, hospital visits, or measurements. A population can thus be said to be an aggregate observation of subjects grouped together by a common feature.

Under what conditions can aerobic respiration be used as a means to generate the ATP needed to carry out cellular processes? (4 points)
Oxygen is absent; electron transport chain is not used.
Oxygen is absent; electron transport chain is used.
Oxygen is present; electron transport chain is not used.
oxygen is present; election transport chain is used,

Answers

Answer: oxygen is present; electron transport chain is used

Explanation:

What happens to a newly created
mountain as a result of weathering and erosion?

Answers

Answer:

Recent research has led to important new insights into how these most ... Mountains are created and shaped, it appears, not only by the movements of the ... uplift to a gradual slide into "old age" caused by slow but persistent erosion. ... Convergence of tectonic plates generally occurs in one of two ways.

Explanation:

Answer:

it desolves

Explanation:

i dont really knoe (=

all ponts are on this plz help

Answers

Answer:

Animal

egg

plant

Flower

seed

Fruit

Explanation:

Will give brainest!!!!
What part of the brain controls the activity level in the body that makes us excited during a competition?

a) The pheromones

b) The adrenal glands

c) The reticular formation

d) The pituitary gland

Answers

Answer:

adrenal glands

Explanation:

they produce adrenaline

Easy 15 points! Please put an explanation
How many atoms of oxygen are left after synthesizing oxygen molecules?

Answers

Answer:

Explanation:

2.

If you mix substance x and substance y to form Substance z Substance is an example of what?

Help help I’m taking a test and need answers please

Answers

Answer:

X is a compound because elements react to form compounds.

Difference between elements and compounds are:

1. Element consists of one kind of atoms whereas compounds consists of one kind of molecule made up of two or more types of atoms.

2. Element cannot be broken into simpler substances but compounds can be broken into simpler substances.Explanation:

Does anybody know what a Non-environmental factor that triggers mutation? Give me one example

Answers

Answer:

A mutation can occur when mistakes are made during DNA replication.

Explanation:

Numerous factors may result in mutations. Some mutations appear to occur on their own, without any environmental factor. They can happen when transcription or replication errors are created in DNA.

What is mutation?

The alteration or modification of a person's nucleic acid or DNA sequence is known as a mutation.

This is a normal process that happens because mutagens lead to mutation. Additionally, for certain objectives, man-made mutations can be created to change the gene sequences.

There are many different kinds of mutations, including chromosomal mutations that change the structure of chromosomes and somatic mutations that impact body cells.

Therefore, mutagens, which may be both environmental and non-environmental, can trigger the mutation in DNA.

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Why do we say chloroplasts look like green footballs even though a lot of the time they look like perfect green spheres?

Answers

Answer:

Explanation:

The football used in American Football is an oval. Chloroplasts can be spherical but also oval-shaped. For the rest of the world, football is what people in the U.S. call soccer. So a football can also be spherical in shape and thus chloroplasts can be spherical just like footballs are. Chloroplasts can also be disc-shaped.

As many as 30 thousand ____ _______ become entangled in lost or discarded fishing nets or cargo straps each year.

Answers

Answer:

As many as 30 thousand fur seals become entangled in lost or discarded fishing nets or cargo straps each year.

Explanation:

Human activities cause many damages to marine mammals in general. One of these activities is fishery. The nests are intercepting the migratory routes of animals or are floating free in the sea after being discarded. They are extremely strong, so whenever animals get stuck on them, they might carry them for months or years, affecting their diving, foraging, feeding, and reproductive behavior. These nets might hurt the animals´ skin, producing a wound that will probably get infected.

A few years ago, at least 50,000 northern fur seals died per year after getting stuck in fishing nets. The populations of these animals decreased sharply, affecting their reproductive and growth rates. In the present, due to the decrease in their population size, the number of dead animals is around 30,000 per year. This reduction in death is only because there are much fewer animals every year.

Explain human impacts on the environment. Give examples.​

Answers

Answer:

what kinda impact the bad or good

Explanation:

The question didnt make sense

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Four examples of the human made environment are buildings,parks,industries and bridges.

is Fat around organs
structure of cell membranes
protection
chemical messenger

Answers

Answer:

protection

Explanation:

The "fat" around the organs is called the "visceral adipose tissue." Its primary function is to "protect" the organs it encloses from injury. It also keeps the person warm especially when exposed to cold environments. Besides this, it also serves as a storage area for your calories in the body. Fat is not completely harmful as most people think.

This is the reason why it is not good to lose so much weight or become too skinny because losing some fat may be harmful to your organ's protection and heat regulation.

Both primary and secondary succession start by producing soil. True False

Answers

Answer:

True

Explanation:

Answer: false

Explanation:

Use the first letter of each term to match it to the correct statement
Options - Tulip, Crocus, Forcing,Daffodil,Stratification

16)_____causing the flower to bloom out of season

17)_____must be planted in pot with flat side facing out

18)_____must be planted in pot with half the bulb exposed


19)_____imitates the winter season by using refrigeration

20)___must be planted in pot covered with one inch of soil


HELPPPPPP

Answers

Answer:

16.) Forcing

17.) Crocus

18.) daffodil

19.) stratification

20.) tulip

Explanation:

which statement describes p waves

Answers

Answer:

There’s no picture

Explanation:

Answer:

They Vibrate From Side To Side, Hope this helps!!

Explanation:

Margo was adopted when she was an infant. Her adoptive parents' intelligence test scores are in the average range, while her biological parents have test scores well above average. When Margo is 30, what can we predict about her performance on an intelligence test?

Answers

It will be more similar to her biological parents test scores

Answer: It will be more similar to her biological parents test scores

Explanation:

Why are enzymes important for living organisms?

Answers

The enzymes in your body help do very important task such as building muscle, destroying toxins, and breaking down food particles during digestion.

what is the respiration through skin called?​

Answers

Answer:

Cutaneous respiration, or cutaneous gas exchange

Explanation:

Answer:

Cutaneous respiration

Explanation:

is a form of respiration in which gas exchange occurs across the skin

PLZ help ill give Brainliest


Question 1 answers
A If there is more food available the population will decrease
B If there is more food available the population will increase
C it will stay the same
D if there is less food the population will increase

Answers

Answer:

B

Explanation:

More food, higher population is allowed due to influx of supplies

Answer:

The answer is B

Explanation:

The answer is B because the population of the Spider wasp is growing due to climate change and their ability to spread out which mean they will need more food to support their growing population which is why more prey can lead to an increase in population.

What time period is called the Age of Mammals?
a.
the Precambrian time
c.
the Paleozoic era
b.
the Mesozoic era
d.
the Cenozoic era

Answers

Answer:

Cenozoic Era

Explanation:

Answer:D

Its the Cenozic era

who is 27tb2926 and why is the person so hard to find

Answers

Answer:

I honestly have no clue. Sorry

Explanation:

What process in prophase 1 causes DNA to switch
places on separate chromosomes?

Answers

Explanation:

Recombination Occurs During the Prolonged Prophase of Meiosis I. Prophase I is the longest and arguably most important segment of meiosis, because recombination occurs during this interval. For many years, cytologists have divided prophase I into multiple segments, based upon the appearance of the meiotic chromosomes.

Hope this helps!

Cell Questions part 2!
Will give brainlist

Answers

Answer:

12 is b

Explanation: ribosoms combine amino acids

7. Explain what makes proteins the most diverse
macromolecule.
8. List which macromolecule is not obtained from our
food and where we do get it from.

Answers

Explanation:

A protein is a linear molecule comprised of amino acids.The sequence of a protein's amino acids is determined by the sequence of bases in the DNA coding for the synthesis of this protein.

NASA scientists have discovered a new planet which is approximately the same size as Earth but the mass is half as much as Earth’s. How would the weight of an astronaut on this new planet compare to his weight on Earth?

Answers

Answer:

Weight will decrease

Explanation:

1kg=10N

1/2kg=10/2N

0.5kg=5N

the astronauts weight will be reduced to half of it

hope it helps:)

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If you get this, you are a critical thinker. I enter the garden. There are 44 people. You kill 40. How many people are in the garden? Random Question That You Can Answer For Points.1) Which is the better buy, 6 bagels for $3.39 or 8 bagels for $5? Explain.2) What is 7lb 4 oz converted to ounces?3) Mr. Swanson bought a package of 10 disposable razors for $6.30. He found that each razor only lasted 1 week. What Was The Cost Per Day? A company makes 100 bags. 32 of the bags have buttons but no zips. 32 of the bags have zips but no buttons. 35 of the bags have neither zips nor buttons. How many bags have zips on them? Pls help . due in a few minutes IXL Special Rights Triangle 1. What is muscle fatigue f (x) = 7(x-1)+8, what is the value of f(4) 3x7 What should be done to both sides of the equation in order to solve y + 8.5 = 17.2?Add 8.5.Subtract 17.2.Add 17.2.Subtract 8.5. Transform the equation to isolate x: ax = bx + 1. How is the value of x related to the difference of a and b?(please help me) What is the main organ of the urinary system A. GallbladderB. StomachC. Kidney D. Small intestine What is the purpose of the urinary bladder?A. Collects and stores tearsB. Collects and stores sweatC. Collects and stores solid wasteD. Collects and stores urine 5. Make your own 2 step equation that has a solution of x = 5 and solve.its not giving me the correct thing i want. i would like for it to give me a 2 step equation that ends up giving me the answer of 3 Tom...(stay) at home on Mondays The hypotenuse of the triangle shown below is 12 inches. What is the lengthof a side in inches? Question 18 of 20Which statement best summarizes the outcome of the Haitian Revolution?O A. Haitian rebels defeated the French military and established a newcountry free of slavery.B. The United States pressured France to leave Haiti and helped itspeople form a democracy.C. French colonists crushed the slave rebellion with the help ofNapoleon Bonaparte.O D. France agreed to end slavery in exchange for Haitian slavesending their rebellion, ok so i am not from USA but who do you guys think should be the president of America joe briden or trump Each of these statements is about European settlement in Africa. Which of these statements BEST explains how the settlement of Africa changed in the late 1800s? A. Settlement shifted from the coasts to the interior, and eventually the entire continent. B. Settlers became solely concerned with establishing trade outposts along the coasts. C. Settlements became focused on providing slave labor to the Americas. D. Settlements began to accommodate for ethnic, cultural, and religious diversity of the African peoples. When comparing the proper position for spotting different exercises, you can conclude that, in spotting any exercise, it is important to __________. A. stand with your feet together B. keep your hand on the bar C. keep your back upright D. Place your hand inside the lifter's hands Please select the best answer from the choices provided. A B C D A person who fails to make loan payments on time is likely to face whichconsequence?A. Paying higher interest rates on future loansB. Having his or her credit score greatly increasedC. Being arrested and charged with bank fraudD. Being given a lower debt-to-income ratio Read this excerpt from The Riddle of the Rosetta Stone by James Cross Giblin.Only those Egyptians who needed the knowledge for their professions learned how to read and write. These included government officials, doctors, and priests, as well as the scribes who did the actual writing on papyrus and stone.After reading this excerpt, readers can infer that .