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What do fireworks, a fried egg, and a rusting vehicle have in common? They all involve chemical reactions. If two or more elements or chemical compounds come into contact with one another and there is enough energy present, a chemical change may take place.

When a substance undergoes a chemical change, the chemical structure of that substance is altered. A chemical change can also be called a chemical reaction. During a chemical reaction a new substance is formed.

Observe the chemical reaction between bromine and aluminum. Pieces of aluminum are cut from a strip of foil and added to liquid bromine. At first there is no reaction because of the protective oxide coating on the aluminum. But soon an exothermic reaction between bromine and aluminum causes brown fumes of bromine to be given off. But as a new substance, aluminum bromide is produced. White smoke is produced.

The resulting residue is also aluminum bromide. When two compounds or molecules react together to form new substances, they are called reactants. They new substances created plus any resulting ash, water vapor, or carbon dioxide are called products, because they are produced by the reaction.

Some chemical reactions, such as the explosion of fireworks, can happen very fast—in less than a second.

Others, like the rusting of a car, might take years. It is important to carefully examine chemical reactions because there are many ways substances can be changed without a chemical reaction taking place.

Changes of state, for example, from a solid to a liquid or from a liquid to a gas, always involve a physical change rather than a chemical one. Melting sulfur is a good example. When solid sulfur is heated to 120 degrees Celsius it melts and first forms a pale yellow liquid.

In this form the atoms are covalently bonded and the liquid can flow easily. However, heated up beyond 150 degrees Celsius, the result is a dark red liquid that is over 2,000 times stickier. The sulfur may have changed physically but it's still sulfur.

No chemical reaction has taken place. Most of the time changes of state can be reversed by either adding or taking away heat. When water is boiled, for example, water vapor molecules are released in the process.

If you captured all the vapor molecules in a container they would reform again as water droplets once the vapor cooled. When a chemical change occurs it is more difficult to revert the substance back to its original state.

Answer:

this is answers to the second picture

Explanation:

1-   energy

2- structure

3- reaction

4- substance

5- reactants

6- products

7- changed

8- At first there is no reaction because of the protective oxide coating on the aluminum. But soon an exothermic reaction between bromine and aluminum causes brown fumes of bromine to be given off. But as a new substance, aluminum bromide is produced. White smoke is produced.

9-   heated to 120 degrees Celsius it melts and first forms a pale-yellow liquid.

In this form the atoms are covalently bonded, and the liquid can flow easily. However, heated up beyond 150 degrees Celsius, the result is a dark red

10- When a chemical change occurs it is more difficult to revert the substance back to its original state. (To be honest I don't know)

Please help!!! Hydrogen and oxygen undergo a chemical reaction to form water. How much water will be created if hydrogen has a mass of 3.56 g and the oxygen has a mass of 25.32 g?

Actual answers only please :)

In this project, you will practice calculating work and speed using the proper formula. You will also use a data table to record and analyze your data. For each question, you will complete a row in your data table to record the details, and your results. Don't forget to use proper units of measurements in all of the parts of your table!

pls help asap mark brainyist can't spell sorry

Is gravity alone sufficient to explain the behavior of the tinsel in the Levitating-orb system? Explain why.

I HAVE A D- IN SCIENCE PLEASE HELP

Complete the sentence.

In chemical reactions, a product is _________.

A. any substance that is to the left of the arrow

B. any substance that is made of the greatest number of atoms

C. any substance that is made from the least number of atoms

D. any substance to the right of the arrow

List the communities in a successional sequence of secondary succession?

List the communities in a successional sequence of secondary succession?

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.

How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 + MgCl2?
A.) Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side
B.) The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.
C.) Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.
D.) The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.

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

What type of force is known for exerting an upward force on objects in a fluid?
1. buoyant force
2. friction force
3. gravitational force
4. magnetic force
The First person to answer will get the brainliest!!!!!!

GIVING 40 POINTS PLZ HELP!!!!!!!!

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

What will a soccer player need to do to change a ball’s position?
1. He must apply gravity to the ball so that the ball will move.
2. He must weigh the ball to determine the motion that needs to occur.
3. He must set the ball in motion by applying a force in the desired direction.
4. He must identify the location of the ball.
First one to answer will get brainliest!

An object has a mass of 960 g and a volume of 15cm3 what’s the density?

HELPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!! 30 POINTS!!!!!!!!!!!!!!

Think about the ecosystem that you live in.
Write a response below describing it in complete sentences.
4)
Use each of these terms correctly in your description:
• community
• ecosystem
• biotic
• population
• individual
• abiotic

with the development of technology why is muscle atrophy occurring more often what can you do to stop it THIS IS A SCIENCE QUESTION

A food scientist is determined to create a mango that looks exactly like a mango but tastes like salmon. Can this be achieved through artificial selection? Why or why not?

PLS HELP DUE SOON(Ignore that wet thingy on my paper it’s my matcha latte it go on it lol)

can someone solve this question please​

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

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.

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

PLS HELP (science)
Match the following molecules with the number of atoms they contain.

1. 2Fe
seven
2. 2Al 3O 2
eight
3. 4O 2
two
4. 5C
five
5. H 2SO 4
ten

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.

What is the name of the tide when the sun, moon, and earth are all aligned, causing the greatest pull for highest and lowest tides?
Question 10 options:

Low tide


Spring tide


High tide


Neap tide

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!!!!!!!

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?

How do wetlands form?

- tributaries flow into rivers.
• Runoff travels down the side of a divide.
ɷ Water builds up in a depression left by an ice sheet.
• Groundwater comes to the surface and floods the land.

take your time :) !

In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the following could represent the mass of the products?

A. 26.6 grams.

B. 13.3 grams.

C. 39.9 grams.

D. 3.3 grams.