PLZ HELP which of the following is an example of a physical change

Chemistry

2 answers:

Elena L [17]2 years ago

8 0

Answer:

C.matter changes,but no new substance is formed.

lubasha [3.4K]2 years ago

7 0

Answer:

D. A piece of food turns brown and starts to smell bad is the answer because it is physical change and physical change is permanent change

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What is the mass of phosphorus that contains twice the number of atoms found in 14

yulyashka [42]

Answer:

15.5 gm

Explanation:

What is the mass of phosphorus that contains twice the number of atoms found in 14 g of iron?

[Relative atomic mass : P = 31; Fe = 56]

14 gm Fe = 14gm/ 56 gm/mole = 14 mole gm/56gm = 14/56 mole

0.25 moles

2 X 0.25 = 0.5 moles

1 mole P = 31 gm

0.5 moles P =31/2 =15.5 gm

3 0

2 years ago

How does a buffer resist change in ph upon addition of a strong acid?

lora16 [44]

Any buffer exists in this equilibrium

HA <=> $H^+ + A^-$
In a buffer, there is a large reservoir of both the undissociated acid (HA) and its conjugate base ( $A^-$ )

When a strong acid is added, it reacts with the large reservoir of the conjugate base ( $A^-$ ) forming a salt and water. Since this large reservoir of the conjugate base is used, the ph does not alter drastically, but instead resist the pH change.

8 0

2 years ago

(Please answer as quickly as possible for brainliest, thanks :))

Eddi Din [679]

A. actinides do not occur in nature.

4 0

2 years ago

Read 2 more answers

Pls i have a chemistry test answers asap :'(

Wittaler [7]

Answer:

in the wire last one is right