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anygoal [31]
3 years ago
11

What is the most important thing you need to remember for physical change?

Chemistry
1 answer:
Verizon [17]3 years ago
5 0
The most important thing you need to know about physical change, is that a physical change does not change the identity, or chemical make up of an object or substance. For example, if you were to have an orange, and you painted it blue, it is still an orange, whereas if you burned the orange, it is no longer an orange. It would be soot/ash. 
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Which event is most likely an example of a chemical reaction
Inessa [10]

Explanation:

One example of a chemical reaction is the rusting of a steel garbage can. That rusting happens because the iron (Fe) in the metal combines with oxygen (O2) in the atmosphere. Chemical bonds are created and destroyed to finally make iron oxide (Fe2O3).

7 0
3 years ago
5 Examples of simple salts
kolbaska11 [484]
<h3>Five Examples of Salts </h3>

  • Sodium Chloride.
  • Sodium chloride (NaCl) is the most common type of salt in our lives.
  • Potassium Dichromate. •
  • Potassium dichromate (K2Cr2O7) is an orange-colored salt composed of potassium, chromium and oxygen.
  • Calcium Chloride.
  • Sodium Bisulfate.
  • Copper Sulfate.

3 0
1 year ago
2. When vinegar is added to eggshells, carbon dioxide gas is produced.​Why?
skad [1K]

Answer:

same as his

Explanation:

4 0
2 years ago
Calculate the concentration of formate in a 100mm solution of formic acid at ph 4.15. The pka for formic acid is 3.75
MissTica

The molarity of formic acid is 100 mM or 100\times 10^{-3}M. The dissociation reaction of formic acid is as follows:

HCOOH\leftrightharpoons HCOO^{-}+H^{+}

The expression for dissociation constant of the reaction will be:

K_{a}=\frac{[HCOO^{-}][H^{+}]}{[HCOOH]}

Rearranging,

[HCOO^{-}]=\frac{K_{a}[HCOOH]}{[H^{+}]}

Here, pH of solution is 4.15 thus, concentration of hydrogen ion will be:

[H^{+}]=10^{-pH}=10^{-4.15}=7.08\times 10^{-5}M

Similarly, pK_{a}=3.75 thus,

[K_{a}=10^{-pK_{a}}=10^{-3.75}=1.78\times 10^{-4}M

Putting the values,

[HCOO^{-}]=\frac{(1.78\times 10^{-4}M)(100\times 10^{-3}M)}{(7.08\times 10^{-5}M}=0.2511 M

Therefore, the concentration of formate will be 0.2511 M.

4 0
3 years ago
A geologist finds a mineral sample alongside a swift flowing river. She determines the mineral is a type of Quartz. Which is tru
Minchanka [31]
I would say d or b sorry im not that good
8 0
3 years ago
Read 2 more answers
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