What is the main difference between a chemical and a physical change? Use examples to support your answer.

Answer:

Physical changes are usually about physical states of matter. Chemical changes happen on a molecular level when you have two or more molecules that interact. Chemical changes happen when atomic bonds are broken or created during chemical reactions.

Explanation:

Example of an chemical reaction: explosion

Example of an physical reaction: Ice melting

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Examples of physical changes are freezing, melting(melting of ice cubes).

Examples of chemical changes are combustion, rusting of iron.

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Which statement best describes what happens to protein when a steak is cooked?
A)It denatures and coagulates during cooking.
B)It decreases in size as amino acids are lost.
C)It loses bacteria because they are denatured.
D)It undergoes polymerization to form longer chains.
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You decided you want to make spaghetti for supper. You first light the gas stove because you need to cook the meat. When the meat is cooked, you add sauce to it. Then you put a pot of water on the stove to get it boiling. The next step is putting the spaghetti noodles in to boil. Finally, you drain the spaghetti noodles and add the sauce. Which of the following describes the chemical changes happening?

A Cooking the meat and boiling the water are both chemical changes.
B Lighting the stove and cooking the meat are both chemical changes.
C Light the stove with a match and boiling the noodles are both chemical changes.
D Mixing the pasta sauce with the meat and boiling the noodles are both chemical changes.

I am an element that has no luster, brittle, and is a poor conductor of electricity. What element can I be?

Which phrase provides the best definition of a landform region?

a large area where the topography contains the three main landforms
the border where two different landforms meet
a large area where the topography is made up of one landform
a large area where the topography is inconsistent and contains multiple landforms

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Jamie completes the following steps in an experiment to investigate how temperature affects how fast something will rust in water. He places a nail in a bowl of water in the sun and a nail in a bowl of water in the shade. He also leaves an iron nail out of the water in a dry bag out of the sun. Why would Jamie leave one out of the water and out of the sun?

A Jamie also wants to test if the water affects how fast the iron nail will rust.
B Jamie notices that the size of the nail is different, so he does not want to use it later.
C Jamie doing all these steps to create a control group to compare his results to.
D Jamie puts the nail in a cooler place to see if it will rust as fast as the other items.

Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?

A Both are changing size and shape.
B Heat is changing the texture of both substances.
C Heat is being added to both, causing a phase change.
D The end products of both cannot be reversed to their original forms.

Suppose that 273 g of the substances listed displaces 26 mL of water. What is the substance?

Substances:
Zinc=7.13
Silver=10.50
Lead=11.35

Which is the highest peak of North America?

1) you are building a model plane that needs small block inside to balance its weight. you find that the block material you are using has half the density you thought it did. you still need the same weight for the blocks in the plane, and they must have the same width and length. how you can keep the weight the same?


2) your teachers set two cups on a bench at the front of the class. one contains water dyed blue and the other clear water. the teacher says one cup is very salty water and the other one is freshwater. how would you figure out which one is salty and which one is fresh.


3) In much of the world, SI units are used everyday life and not just in science. why would it make sense for people in the united states to use SI in everyday life, too? explain using math terms such as calculate and convert.



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