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S_A_V [24]
3 years ago
15

What are some natural processes that represent physical and chemical changes?

Chemistry
2 answers:
saveliy_v [14]3 years ago
7 0

A "natural" chemical change would be burning wood, cooking eggs, baking a cake and milk going sour. These changes can't be changed so therefore they are chemical changes.

A natural physical change would be mixing salt or sand with water, melting or boiling water, cutting wood, and shredding paper. The salt and sand can be removed from the water. Hot and cold water are still water. Wood and paper didn't change their composition. All of these examples are reversible.

KiRa [710]3 years ago
3 0

Answer:

Chemical change:

  • Rusting of a metal iron
  • Food contamination
  • Seed germination

Physical change:

  • Melting of ice
  • Boiling of water
  • Rock weathering

Explanation:

The difference chemical and physical change is physical change is the change of form, such as change in shape, and chemical change is the change of chemical bonds.

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kari74 [83]

Answer:

I can use a dichotomous key. It helps me classify objects by sorting it out with "yes" and "no" questions.

or

I can use a Punnett Square. It helps me classify what genes the offspring will receive simply by figuring out the recessive and dominant genes as well as the hetzygous and homzygous.

Now give an example of which ever chart you choose by drawing it if that is required. For the Punnett Square label each of the squares Top right Hetzygous, top left dominant, bottom left recessive, bot-tom right homzygous. And for the dichotomous key put a 5-7 length branch showing the animals that have fur, can breathe under water, what cannot or doesn't have those traits. or something similar

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10. Make your own unique problem for your classmates to solve for the
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Answer:

Explanation:

<u>Problem</u>:

In a gender based experiment, the blood pressure of different ages of men is been checked and recorded to determine if there is any correlation. What will be the independent, dependent and controlled variables?

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A controlled variable is the variable that is left constant throughout the course of an experiment. The controlled variable here is the gender.

A dependent variable is the variable that is been determined or measured during the course of an experiment. The dependent variable here is the blood pressure.

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3 years ago
What material was added to powdered rock during tuttle and bowen's experiments?
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4 0
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How many molecules are in 18moles of CH.​
-Dominant- [34]

Answer:

1.08 x 10²⁵molecules

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