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3 years ago

Which of the following is a physical change? A. corrosion B. explosion C. evaporation D. food spoilage

2 answers:

8 0

Evaporation is a physical change. You can tell by the fact that when somthing evaporates, its chemical identity does not change. The only thing that changed is its physical properties.

DaniilM [7]3 years ago

7 0

Answer: C. evaporation

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: evaporation as it involves change of state from liquid to gas

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Corrosion as it leads to formation of new substances.

Explosion as it leads to release of heat.

Food spoilage as it involves chemical combination with oxygen.

Thus evaporation is a physical change.

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State the number of neutrons in an atom of Ne-20 and the number of neutrons in an atom of Ne-22. choose two answers * 1 point Ne

saveliy_v [14]

Answer:

Ne 20: 10

and

Ne 22: 12

Explanation:

Ne-20:

N = A - Z = 20 - 10 = 10 neutrons

Ne-22:

N = A - Z = 22 - 10 = 12 neutrons

N: number of neutrons

A: mass number

Z: atomic number

8 0

3 years ago

What is the density, in g/cm3, of an object with a mass of 21 g and volume of 15 cm3?

maks197457 [2]

Answer:

1.4 g/cm^3

Explanation:

Density = Mass/Volume

Density = 21g/15cm^3

Density = 1.4 g/cm^3

Hope this helps!!!

-Unicorns110504

*Please mark brainliest*

4 0

3 years ago

Read 2 more answers

WILL GIVE BRANLIEST TO FIRST ANSWER!!! I know the correct answer is either a or d. Can anyone explain which one it is and why? C

oee [108]

Answer: The IUPAC name of $CH_3C\equiv CCH_2CH_2Cl$ is 5-chloro-2-pentyne

Explanation:

1. First select the longest possible carbon chain. For the number of carbon atom, we add prefix as 'meth' for 1, 'eth' for 2, 'prop' for 3, 'but' for 4, 'pent' for 5, 'hex' for 6, 'sept' for 7, 'oct' for 8, 'nona' for 9 and 'deca' for 10.

2. The longest possible carbon chain should contain all the bonds and functional groups.

3. The numbering is done in such a way that the carbon containing the functional group or substituent gets the lowest number. Triple bond is given priority over substituent halogen.

4. The naming of alkane is done by adding the suffix -ane, alkene by adding the suffix -ene, alkyne.

Thus the IUPAC name of $CH_3C\equiv CCH_2CH_2Cl$ is 5-chloro-2-pentyne

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3 years ago

FREE BRAINLIEST IF CORRECT

stira [4]

Explanation:

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3 years ago

What is the difference between solid nonmetals and solid metals?

Bingel [31]

Metals have 1-3 electrons in the outer shell of each atom. Non metals usually have 4-8 electrons in their outer shell.

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3 years ago