In class we made salt crystals. To do this we put a supersaturated solution of salt into a glass of water. After a few days the water evaporated and the salt crystals were left on the paper cutouts. When the salt dissolved in the water was this a physical change or a chemical reaction? Please explain your answer in detail.

Answers

Answer 1

Answer:

Dissolving a solid in liquid, such as table salt in water, is a physical change.

Explanation: Its a physical change because only the state of the matter has changed


Related Questions

You have been given the task of designing a heat pack to relieve soreness in muscles by combining oxygen and iron. The more oxygen that is added to iron, the more it will heat up. Which of the following temperature changes would you be looking for?

A.There will not be a reaction
B.An increase in temperature, showing an endothermic reaction
C.You should not expect a temperature change because this is a physical reaction
D.An increase in temperature, showing an exothermic reaction

Answers

Answer:

an increase in temperature showing an endothermic reaction

Explanation:

the atmospheric oxygen is supplied to the iron .An endothermic reaction is any chemical reaction that absorbs heat from its environment.

Mixing baking soda and vinegar is an example of an endothermic reaction. This means...

A. baking soda and vinegar are products in this reaction.

B. energy is taken in during the chemical reaction.

C. energy is released during the chemical reaction.

D. there is no change in energy during the chemical reaction.

Answers

The answer would be A
A. baking soda and vinegar are products in this reaction.

Mixing baking soda and vinegar is an example of an endothermic reaction. This means...
A. baking soda and vinegar are products in this reaction.

B. energy is taken in during the chemical reaction.

C. energy is released during the chemical reaction.

D. there is no change in energy during the chemical reaction.

Answers

Answer: think a

Explanation:

Which of the following always changes when a substance undergoes a chemical change?

A. State of matter of the substance.

B. Arrangement of the atoms composing the substance.

C. Color of the substance.

D. Mass of the substance.

Answers

Answer:

C

Explanation:

All chemical reactions will show a change in color.

HELP ME PLEASE!!! ASAP

Answers

it's c I believe

Explanation:

I believe

Answer: chromium and carbon monoxide

Explanation:

How does the Coriolis effect impact the Gulf Stream and the Brazil Current?
It turns the Gulf Stream southwest and the Brazil Current northeast.

It turns the Gulf Stream northwest and the Brazil Current northeast.

It turns the Gulf Stream northeast and the Brazil Current southwest.

It turns the Gulf Stream northeast and the Brazil Current northwest.

Answers

Answer:

Honestly, I think it is C.

Explanation:

Brazil is in the south, so that's why it is C.

hope this helped.

Which items are minerals or contain minerals? Check all that apply.

asap please:)
-lawn fertilizer

-topsoil

-a diamond necklace

-a copper electrical wire

-a cellular phone

Answers

Answer:

Hey dude....

Explanation:

This is ur answer.....

Check all because all of them contain minerals.....

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

lawn fertilizer, topsoil, and a diamond necklace

Explanation:

lawn fertilizer and topsoil are coming out of the ground, therefore some amount of minerals will be in them, such as iron added to it to make whatever its going on grow stronger.

a diamond necklace is a jewel that is coming out of the ground. it is categorized as a raw mineral.

I'm not 100 percent sure about the copper wire and the cell phone.

I do belive copper is a mineral.

Which of these items is a substance that is made from two or more different elements?

A. Element

B. Mixture

C. Oxygen

D. Compound

Answers

A compound which is D

Answer:

b mixture

Explanation:

if you mix two or more things makes a mixture

How can energy transfer affect the physical and chemical properties of matter?

Answers

A physical change is a change in the state or properties of matter without any accompanying change in the chemical identities of the substances contained in the matter. Physical changes are observed when wax melts, when sugar dissolves in coffee, and when steam condenses into liquid water. Other examples of physical changes include magnetizing and demagnetizing metals (as is done with common anti-theft security tags) and grinding solids into powders (which can sometimes yield noticeable changes in color).

The characteristics that distinguish one substance from another are called properties. A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. Some physical properties, such as density and color, may be observed without changing the physical state of the matter. Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change

Figure :Copper and nitric acid undergo a chemical change to form copper nitrate and brown, gaseous nitrogen dioxide. During the combustion of a match, cellulose in the match and oxygen from the air undergo a chemical change to form carbon dioxide and water vapor. Cooking red meat causes a number of chemical changes, including the oxidation of iron in myoglobin that results in the familiar red-to-brown color change.

chemical change always produces one or more types of matter that differ from the matter present before the change. The formation of rust is a chemical change because rust is a different kind of matter than the iron, oxygen, and water present before the rust formed. The explosion of nitroglycerin is a chemical change because the gases produced are very different kinds of matter from the original substance. Other examples of chemical changes include reactions that are performed in a lab (such as copper reacting with nitric acid), all forms of combustion (burning), and food being cooked, digested, or rotting. Note that the number of atoms for a given element is calculated by multiplying the coefficient of any formula containing that element by the element’s subscript in the formula. If an element appears in more than one formula on a given side of the equation, the number of atoms represented in each must be computed and then added together. For example, both product species in the example reaction, CO2 and H2O, contain the element oxygen, and so the number of oxygen atoms on the product side of the equation is

(1 CO2 molecule × 2 O atoms per CO2 molecule) + (2 H2O molecules × 1 O atom per H2O(molecule) = 4 O atoms

The equation for the reaction between methane and oxygen to yield carbon dioxide and water is confirmed to be balanced per this approach, as shown here: CH 4 + 2O2⟶CO2 + 2H2O

Element Reactants Products Balanced?

C 1×1 = 1 1×1 = 1 1 = 1, yes

H 4×1 = 4 2×2 = 4 4 = 4, yes

O 2×2 = 4 (1×2) + (2×1) = 4 4 = 4, yes

A balanced chemical equation often may be derived from a qualitative description of some chemical reaction by a fairly simple approach known as balancing by inspection. Consider as an example the decomposition of water to yield molecular hydrogen and oxygen. This process is represented qualitatively by an unbalanced chemical equation: H2O⟶H2 + O2 (unbalanced)

Comparing the number of H and O atoms on either side of this equation confirms its imbalance:

Element Reactants Products Balanced?

H 1×2 = 2 1×2 = 2 2 = 2, yes

O 1×1 = 1 1×2 = 2 1 ≠ 2, no

H2O to H2 O2 would yield balance in the number of atoms, but doing so also changes the reactant’s identity (it’s now hydrogen peroxide and not water). The O atom balance may be achieved by changing the coefficient for H2O to 2.

2H2O⟶H2 + O2 (unbalanced)

Element Reactants Products Balanced?

H 2×2 = 4 1×2 = 2 4 ≠ 2, no

O 2×1 = 2 1×2 = 2 2 = 2, yes

The H atom balance was upset by this change, but it is easily reestablished by changing the coefficient for the H2 product to 2.

2H2O⟶2H2 + O2 (balanced)

Element Reactants Products Balanced?

H 2×2 = 4 2×2 = 4 4 = 4, yes

O 2×1 = 2 1×2 = 2 2 = 2, yes

These coefficients yield equal numbers of both H and O atoms on the reactant and product sides, and the balanced equation is, therefore:

2H2O⟶2H2 + O2

Types of Chemical Reactions

Humans interact with one another in various and complex ways, and we classify these interactions according to common patterns of behavior. When two humans exchange information, we say they are communicating. When they hit each other with their fists, we say they are fighting

A photograph is shown of a yellow green opaque substance swirled through a clear, colorless liquid in a test tube.

When energy is transferred through one material to another material it affects the bonding between the atoms or moleculesThe bond becomes weak or may stronger .The. it affects the chenical properties like boiling point, melting point etc.The energy also can change the state of matterLike hydrogen gas and oxygen gas turns liquid water .So physical properties are changed

Fossils are the preserved remains or traces of an organism that used to be alive.

Answers

Answer:

This is True

Explanation:

A fossil is any remains or trace of an ancient organism. Fossils include body fossils, left behind when the soft parts have decayed away, as well as trace fossils

true because the definition of a fossil is “the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.”

PLZ HELP (SCIENCE) Match the following items.

1. a reaction that releases energy
decomposition
2. a reaction that takes in energy
endothermic
3. chemical change whereby a molecule breaks down into simpler molecules or elements
exothermic
4. written underneath or below
oxidation
5. a chemical change resulting from a reaction with oxygen
subscript

Answers

Oxidation: a chemical change resulting form a reaction with oxygen
Endothermic:a reaction that takes in energy
Exothermic: a reaction that releases energy
Decomposition:chemical change whereby a molecule breaks down into simpler moles clues or elements
Subscript:written underneath or below
4.subscript
5. Oxidation
2. Endothermic

Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in the container as he does this.
The temperature in the container rises very fast.

What kind of change is likely to be happening in the container?

A. A physical change.

B. A chemical change.

C. Neither a chemical nor a physical change, only a temperature change.

D. No evidence of any type of change.

Answers

b. a chemical change

Answer:

B

Explanation:

temperature is a characteristic of a chemical change

List the communities in a successional sequence of secondary succession?

Answers

Secondary succession occurs in areas where a biological community has already existed but some or all of that community has been removed by small-scale disturbances that did not eliminate all life and nutrients from the environment.

The given communities can be ordered in the secondary succession as grass, shrubs, small trees and large tress.

What is secondary succession ?

The life cycle of a plant is characterized by secondary ecological succession. Secondary succession, in contrast to primary succession, is a process initiated by an occurrence such as a forest fire, harvesting, hurricane, etc. that reduces an already established ecosystem (such as a forest or a wheat field to a smaller population of species.

As a result, secondary succession occurs on preexisting soil, whereas primary succession typically takes place in a location lacking soil. Many elements, including trophic interaction, starting composition, and competition, might influence secondary succession. Trade-off with colonization

Therefore, the given communities can be ordered from the small level to higher level as grass, shrubs, small trees and large tress.

Find more on secondary succession:

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Your question is incomplete. But your complete question is as follows:

List the given communities in a successional sequence of secondary succession? shrubs, small trees, grass, large tress.

The Statue of Liberty is made of copper metal. Copper metal has the physical property of being orange in color. Over years of being exposed to moist air, the surface of the statue has begun to form a green coating. Is the green coating the product of a physical or chemical change? Explain how the green layer is formed.

Answers

Answer:

The statue is made of a metal called copper. Over time, the copper has gone through a chemical change. This is called a chemical reaction.

Explanation:

i dont think this will help...

Answer:

Chemical.

Explanation:

Pretty sure its chemical, due to it oxidising which is a chemical reaction.

So im very confused!!! if you want to answer then plz read the instructions and plz give proper answer !!! Need help asap!!!!!!!!!!!!!!!!

Answers

It is kenetic energy
First answer should be a picture of someone with spiky hair and a balloon next to them. It’s kinetic energy.

Second answer is that the spring, when pushed down, has the POTENTIAL to spring back up and exert energy. It’s potential energy.

Hope this helps

What type of fossil forms when the impression from the remains of an organism is filled in with soil and hardens into the shape of the original organism?

Answers

Answer:

i belive its a "Mold fossil"

Explanation:

True or false? Tornadoes can form when the air in a strong thunderstorm or a supercell begins to rotate.

Answers

Answer:

true

Explanation:

tornadoes can dogs when they are in the air which then form strong thunderstorms

Answer:

it's true ..

Explanation:

they r caused by weather conditions

____________ limits or stops the growth of bacteria.


Antibiotics
Antibiotics

Chemicals
Chemicals

Photosynthesis
Photosynthesis

Vaccines

Answers

Answer:

Vaccines

Explanation:

ANSWER: Vaccine


Explanation: I had this question and got it right

Mixing baking soda and vinegar is an example of an endothermic reaction. This means...

A. baking soda and vinegar are products in this reaction.

B. energy is taken in during the chemical reaction.

C. energy is released during the chemical reaction.

D. there is no change in energy during the chemical reaction.

Answers

Answer:

The answer is C

Explanation:

C Is the right answer

Shay constructed a scientific model of the carbon cycle. She included plants, animals, industry, fossil fuels, and the atmosphere. Which of the following arrows belongs in Shay’s model?

Answers

Answer:

no one can answer your question because you have shown no arrows.

What is inertia?
1 . the tendency of an object to stay at rest or in motion
2. the energy of an object because of its position
3. a force that pulls objects toward each other
4. a force that slows an object down

Answers

Answer:

A. The tendency of an object to stay at rest or in motion.

Explanation:

Interna makes stuff stay on motion or in place.

Answer:

the tendency of an object to stay at rest or on motion

Plz help! Write your answer in complete sentences ! Write a proper answer! 1st one to answer will get a brainliest!

Answers

Answer:

the name for CaCO3 is Calcium Carbnate, and its relations with coral reefs is that the process for making said compuond happens within coral, and is considered the building block for coral reefs.

Explanation:

hope this helps!

If the Titan lake evaporated, how would the change in kinetic energy affect the speed of the molecules found in the lake? (highlight one)
 The kinetic energy would increase. The molecules would move faster.
 The kinetic energy would decrease. The molecules would move slower.
 There would be no change in kinetic energy. The molecules would move at the same speed.

Answers

Answer:

a) The kinetic energy would increase. The molecules would move faster.

Answer: The kinetic energy would increase. The molecules would move faster.

Slow cooling of hot magma leads to the formation of ___________ crystals

Answers

Answer:

Slow cooling leads to the formation of large crystals. If the crystals remain undisturbed while cooling, they grow according to a regular pattern. Magma closer to the surface cools much faster than magma that hardens deep below ground. With rapid cooling, there is no time for magma to form large crystals.

Explanation:

Hope it's help

Answer:

large

Explanation:

Explain the green house effect (make sure that you explain the role of the Nitrogen and Carbon cycle)

Answers

Answer:

Nitrogen emissions such as ammonia, nitrogen oxide and nitrous oxides contribute to particulate matter and acid rain. Nitrous oxide is a particularly potent greenhouse gas as it is over 300 times more effective at trapping heat in the atmosphere than carbon dioxide.

Explanation:

A gate made of painted iron is beginning to rust in areas where the paint has worn away. The paint served as a protective barrier between the iron and the oxygen in the air.

Why is the formation of rust considered a chemical process




A. Rust and iron are completely different substances with different properties.

B. Rust is just a different state of matter than iron.

C. Rust is a different color than iron.

D. Rust has the same arrangement and types of atoms as pure iron.

Answers

Answer:

I would say A

Explanation:

when rust forms it is a completely different substance and a chemical change is when a new substance forms, hope this helps!

A submarine fills a special storage area known as a ballast with water in order to increase its density. This allows it to dive deeper in the ocean. When a submarine needs to rise rapidly, compressed air is used to push the water out of the ballast. What effect does replacing the water in the ballast with air have on the submarine?

Answers

Answer:

the submarine floats after replacing the water with the compressed air

Answer:

The submarine will rise.

Explanation:

To get a submarine to surface, the main vents in the top of the tank are closed and high-pressure compressed air is blown into the ballast tanks, forcing the water out through the flood ports at the bottom of the tank. This increases the vessel's displacement.

Plz help! Please write your answer in complete sentences and write a proper answer!
FIrst on to answer will get a brainliest!!! Thx!

Answers

Answer:

When launching a rocket in space, the rocket's fuel starts burning and is pushed downward in the form of a gas. Due to which an external force is generated on the rocket in an upward direction which is a reaction of the force of burning fuel gas.

In a chemical reaction, which of the following is true of the products?

A. The products have the same shape as the reactants.

B. The products have the same physical properties as the reactants.

C. The products have the same state of matter as the reactants.

D. The products have the same number atoms as the reactants.

Answers

Your answer would be c I’m pretty sure

The correct statement about the chemical reaction is "the products have the same number atoms as the reactants."

What is chemical reaction?

A chemical reaction occurs when one or more reactants (also known as reactants) are changed into one or more products (also known as products).

Chemical transformation occurs as a result of this process, which involves the breaking and forming of chemical bonds.

Rust is formed when iron and oxygen combines with each other.

Only the atoms present in the reactants can end up in the products of a chemical reaction. There are no new atoms formed, and no atoms destroyed.

In a chemical reaction, the reactants and products have the same atoms, but they are rearranged during the reaction. As a result, the atoms in the products end up in various combinations. As a result, the products are new chemically distinct substances from the reactants.

Hence, the correct statement is option D.

To know more about chemical reaction here

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Plz, help! I need help with questions a and b! Plz, write your answer in complete sentences! And the first person to answer will get a brainliest! Plz, NO SCAM links!!!!!!!

Answers

Use socratic it’s an app it will have the answer for you
Answer:
FOR A : Once the tennis ball and the board are in motion, they will continue in motion in the same direction at the same speed unless acted upon by an unbalanced force. This demonstrates Newton's first law of motion.

FOR B: When the accelerating ball hits the resting pins, it causes them to become unbalanced forces and they accelerate into each other
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