A large bar of solid gold is melted into liquid. The liquid is then poured into
molds to make a number of gold coins. Was this a chemical or physical
change? Explain.


Chemical, because the gold turned into something new and is no longer gold.


Physical, because the gold changed size and shape, but is still gold.

Answers

Answer 1

Answer:

It is physical, the gold is still gold and there has not been any chemical change. Melting, boiling, freezing, etc. are physical changes.


Related Questions

need help need help!!!!!!​

Answers

Answer:

the answer is b

Explanation:

hope this helps love:))

B is the answer I got.

About how much of Earth’s surface is covered by the Pacific Ocean? Identify the locations of at least two major mountain chains that extend over more than one continent.

Answers

Answer: covering more than 30%

Explanation:

How does the polarity property make hydrogen bonds between water molecules possible?

Answers

Answer:

The two hydrogen atoms and one oxygen atom within water molecules (H2O) form polar covalent bonds. ... As a result of water's polarity, each water molecule attracts other water molecules because of the opposite charges between them, forming hydrogen bonds.

Explanation:

How is radar used to forecast weather?

It shows areas of high and low pressure.
It collects data in the upper atmosphere.
It collects weather data as part of a network around the country.
It locates and tracks storms, and follows the path of storm systems.

Answers

Answer:

D. It locates and tracks storms, and follows the path of storm systems.

Explanation:

It's correct on Edge 2021

Radar is used to forecast weather through the following:

By locating and tracking stormsFollowing the path of storm systems.

What is a Radar?

Thus involves the use of radio waves to determine the distance, angle, or relative velocity of objects.

This is why it is used locating and tracking storms, and following the path of storm systems during weather forecasts,

Read more about Radar here https://brainly.com/question/1073374

If you cut a tree trunk into pieces, the resulting pieces and dust add up to the same mass as the original trunk. This is a demonstration of

Answers

Answer:

The law of conservation of mass

Explanation:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Consider the energy diagram below.
What is the correct answer

Answers

Answer:

B

Explanation:

Less activation energy means the reaction will easily occur.

6. When scientists “culture” human cells what exactly does that mean?

Answers

Answer:

The process by which cells are grown under controlled conditions, generally outside their natural environment. After the cells of interest have been isolated from living tissue, they can subsequently be maintained under carefully controlled conditions.

Explanation:

It means that the human cells are being grown outside of the human body in controlled conditions.

Differentiate between breathing and respiration
Your answers


Answers

Answer:

Breathing is a biophysical process that involves the exchange of Gases through inhalation and exhalation

repiration is a biochemical process to realest energy from organic compounds which are then used for performing different physical activities

Explanation:

Lipids are...

A. Protein molecules

B. Similar to water molecules

C. Polar molecules

D. Nonpolar molecules

Answers

Answer:

The answer you are looking for is D.

Explanation:

Lipids are molecules that contain hydrocarbons and make up the building blocks of the structure and function of living cells. (non- polar molecules)

Lipids are fat molecules and are hydrophobic (water repulsive) in nature. Thus, option D is correct.

What are Lipids?

Lipids are important biomolecules and are widely distributed in biological systems. Lipids are organic macromolecules.

Lipids are insoluble in water (polar) and require non-polar solvents mainly hydrocarbons for dissolution like petroleum, ether etc. Thus, non-polar in nature.

Lipids include array of molecules like fats, wax, steroids, vitamins (fat-soluble; A,D, E and K), hormones, oils etc and have diversified functions.

Lipids form an integral part of the cell membrane. It also surrounds membranous structures. It protects the cellular membranes by creating an insulating layer.

Lipids are essential for storing and conserving energy in mammalian body. It helps in metabolism of glucose by converting extra glucose to glycogen in adipose tissues.

Lipids also act as transport molecules in the body. Many lipids function as chemical messengers.

Therefore, Lipids play a pivotal role in living system.

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State on way how forests could be restored

Answers

Answer: reduce agriculture

Explanation:

Our Sun is a sphere of plasma held together by _______.

Answers

Answer:

Our Sun is a star, a sphere of plasma held together by gravity.

Explanation:

Answer:

gravity.

Explanation:

As the concentration of molecules outside a cell increases, more molecules will enter the cell because--

Answers

Answer:

of diffusion

Explanation:

Molecules move down a concentration gradient without the need to use energy. This means they move from a high concentration to a low concentration. This occurs across a semi-permeable membrane, like the cell membrane, by simple diffusion.

How might this change affect the structure and function of the protein?

Answers

Answer:

Explanation:

Three-dimensional folding of a protein is due to interactions among the R groups of the amino acids. Cysteine has a sulfhydryl group, which may form a disulfide bridge with another part of the polypeptide chain. Valine has no sulfhydryl group and is nonpolar, which will affect how the polypeptide will fold.

the energy of motion

kinetic energy
potential energy

Answers

Kinetic energy is the energy of motion :)
Potential energy is when the object is at rest, I believe

Answer:

I KNOW I KNOW I KNOW

Explanation:

kinetic energy

In your opinion, should viruses be classified as living or nonliving? Be sure to use evidence from the chart in your answer.

Answers

Answer:

hope it helped. if yes pls follow

Explanation:

living things use energy. But virus does not use energy. So my opinion is virus is non-living.

Answer: ............

Explanation:

What is the function of the respiratory system?
O to break down food
O to transport materials in the body
O to breathe
O to rid the body of waste
I will Mark brainliest if u get it right

Answers

Answer:

my guess is C- to breathe...but the respiratory system also gets rid of waste, but mainly to help a person breathe

Explanation:

hope this helps

The function of the respiratory system is to break down food.

RESPIRATORY SYSTEM:Respiratory system is one of the system of living organisms that consists of organs, which functions in exchange of gases in and out of cells.

The major organ of the respiratory system is the lungs. However, respiration majorly deals the breakdown of food molecules in the cells.

These breakdown of food molecules release energy in form of ATP, which is needed to perform cellular activities.

Therefore, the function of the respiratory system is to break down food.

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which instrument with a low magnification and uses light would be most appropriate to observe an eukaryotic cell

Answers

Answer: I wish I knew

Explanation:

Different genes control different______ of an organism

Answers

Answer:

May you provide the more so I can answer you

Answer: Structure because is get different organism

Which structure is found in all eukaryotic cells?
A-large central vacuole
B-cilia
C-flagella
D-Golgi apparatus
Please help!!!

Answers

Answer:

I think it is D - Golgi apparatus

Answer:

Which structure is found in all eukaryotic cells?

A-large central vacuole

B-cilia

C-flagella

D-Golgi apparatus

also more that found in all eukaryotic cells:-

cell membranecytoplasmNucleusmitochondriaEndoplasmic ReticulumGolgi apparatusribosomecytoskeleton

need further explanation ? don't hesitate to ask

Hope this helps

please help asap i will mark brainliest

Answers

Answer:

a

Explanation:

C I think hopefully I’m right

What is the function of the cell wall?

Site of ribosome production

Site of protein production

Supports and protects plant cells

Site of ATP production

Answers

supports and protects plant cells

significance of sexual reproduction
please answer fast​

Answers

Answer:

Sexual reproduction is the process in which male and female gamete fuse to form zygote through a process called fertilization and it is important for plants as it provides variation to the progeny that helps in the better survival and help it to gain its own uniqueness within the species and remove the unwanted genes and lower the risk of getting a disease

Answer:

Sexual reproduction leads to variation which provides protection as different organisms will be more prone to different things

What would happen to an animal cell with an internal salt concentration of 2% if it were placed in a salt solution with a salt concentration of 20%? HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

Answers

Answer:

Im pretty sure it would become shriveled

Explanation:

which of the following organelles is most likely to affect apoptosis?

Answers

Answer:

mitochondria

Explanation:

Answer:

mitochondria

Explanation:

Sucrose is made of which simple sugars?
glucose and fructose
fructose and galactose
galactose and cellulose
cellulose and glucose

Answers

Answer:

it is made of

glucose and fructose.

Sucrose is made up of simple sugars glucose and fructose. Thus, the correct option is A.

What are Simple sugars?

Simple sugars may be defined as carbohydrates in their most basic form. Such types of carbohydrates contain only one to two sugar molecules and are digested quickly.

Monosaccharides and disaccharides are examples of simple sugars. Examples of simple sugars are glucose, fructose, and galactose.

Therefore, Sucrose is made up of simple sugars glucose and fructose. Thus, the correct option is A.

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If a diploid tomato cell has 24 chromosomes, how many chromosomes will the tomato's sex cells have?a.12c.24b.6d.48

Answers

Answer:

12!

Explanation:

Sex cells only carry half of what makes up the organism's DNA. This is so that when they find a mate, in this case- another tomato, their sex cells and their partner's sex cells will add up to the appropriate amount of chromosomes in the organism's DNA. In this case, 24.

6 times 7 ???????????????/

Answers

42 is the correct answer

Answer:

42 is the answer to 6 x 7

Explanation:

HELP i’ll brainLIST U
why are water quality standards important?

a. they help protect clean water and improve the quality of polluted water

b. industries would not self regulate and the standards force them to treat unsafe water

c. The standards guarantee that every home in the nation has safe drinking water

d. there is a limit amount of clean water in the world and like oil once it used up it’s gone

Answers

I did research on it and I choose ( a.)

Tropical rain forests tend to have soils that are nutrient poor, and most of the nutrients are found in the top few inches of the soil.

Which adaptation is most likely found in tropical trees?

A. deep root systems
B. shallow root systems
C. needles
D. pine cones

Answers

I thibk its a bro but yea im not 100 percent sure

Answer:

B. shallow root systems

Explanation:

Brainliest Please

pleasssssse helpppppp!

Answers

Your answer would be A. Your welcome :)
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