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tatuchka [14]
3 years ago
15

What methods do scientists use to determine if a change was physical or chemical?

Chemistry
1 answer:
Bess [88]3 years ago
5 0
A physical change will not change the chemical make-up of the material. the change will not produce a new substance.

a chemical change will have a reaction that produces heat, light, a change in color, releases a gas, or rust
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Indicate the oxidation state for each of the following:
Nimfa-mama [501]
  • P2H2 Oxidation State - Diphosphene

       P2H2 has an oxidation number of +1. In P2H2, the oxidation    

        number of H is -1

  • H2C2O4 Oxidation State - Oxalic Acid

       C has an oxidation number of +3 in H2C2O4. O has an oxidation

        number of -2 in H2C2O4. H2C2O4 has an oxidation number of +1.

  • CrO2 Oxidation State - Chromium(IV) Oxide

         CrO2 has an oxidation number of +4.

<h3>Explain oxidation?</h3>

The oxidation state, also known as the oxidation number, is an atom's hypothetical charge if all of its bonds to other atoms were fully ionic.

The sum of the oxidation states of all the atoms in an ion equals the ion's charge.

A substance's more electronegative element is given a negative oxidation state. The one that is less electronegative is given a positive oxidation state.

To learn more about oxidation refer to :

brainly.com/question/27239694

#SPJ13

6 0
1 year ago
Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons must be _______________.
Nikitich [7]
Remember this:

atomic mass= atomic number + number of neutrons 

The atomic number (same thing as number of protons) in this case is 15. The atomic mass is 31. 

So, we subtract 15 from 31 to find the number of neutrons.

31-15=16 

16 neutrons!!!
6 0
3 years ago
Please help me please please :(
Annette [7]

Answer:

B. and A.

Explanation:

May I have the Brainlliest award?

3 0
3 years ago
I need help with this pleae
pantera1 [17]
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity. Examples include beaches, deltas, glacial moraines, sand dunes and salt domes
3 0
3 years ago
??????????????????????????????????????????????
Elanso [62]

Answer:

A = Ureter

  • Small amounts of urine flow from the ureters into the bladder

B = Urethra

  • The Urethra is the tube that carries urine from the bladder to outside the body

C = Urinary Bladder

  • Stores Urine

D = Kidney

  • remove wastes and extra fluid from your body.

<u>-TheUnknown</u><u>Scientist</u>

7 0
3 years ago
Read 2 more answers
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