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Phantasy [73]
3 years ago
12

Explain the most important difference between a physical and chemical change.

Chemistry
2 answers:
timama [110]3 years ago
7 0
You can see a physical change always but not always a chemical
Semmy [17]3 years ago
6 0

Answer:

answer below... hope this helps

Explanation:

When a substance undergoes a <u>physical change</u>, its composition remains the same despite its molecules being rearranged. When a substance undergoes a <u>chemical change</u>, its molecular composition is changed entirely. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

Burning of paper and log of wood, Digestion of food, Boiling an egg, Chemical battery usage, Electroplating a metal, Baking a cake, Milk going sour is a chemical change

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Classify the following materials as solid, liquid, or gas at room temperature: milk, helium, granite, oxygen, steel, and gasolin
saul85 [17]
At room temperature means in their original state without undergoing any changes.

At room temperature:
milk is liquid
helium is gas
granite is solid
oxygen is gas
steel is solid
gasoline is liquid
4 0
3 years ago
A cake is made by mixing ingredients and placing the material in an oven for baking. What type of reaction is involved?
elena-s [515]

Answer: endothermic

Explanation:

The cake (the subject) is receiving heat from the oven (its surroundings) in order to bake.

3 0
3 years ago
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An isotope of potassium with a half-life of roughly one billion years is often used in radioactive dating. This isotope decays t
Archy [21]

Answer : The chemical symbol for the element that results from this process is, (Ar) for argon.

Explanation :

Electron capture : In this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. Simply, a proton and an electron combines together to form a neutron. Mass number does not change in this process.

_Z^A\textrm{X}+_{-1}^0\textrm{e}\rightarrow _{Z-1}^A\textrm{Y}

The equation for the given reaction is,

_{19}^{40}\textrm{K}+_{-1}^0\textrm{e}\rightarrow _{18}^{40}\textrm{Ar}

Thus, the chemical symbol for the element that results from this process is, argon (Ar).

5 0
4 years ago
Writing net ionic equation:<br> of cu with nitric acid
Lesechka [4]

The net ionic equation is

Cu(s) + 4H⁺(aq) + 4NO₃⁻(aq) ⟶ Cu²⁺(aq) + 2NO₃⁻(aq) + 2NO₂(g) + 2H₂O(ℓ)

<em>Molecular equation :</em>

Cu(s) + 4HNO₃(aq) ⟶ Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(ℓ)

<em>Ionic equation: </em>

Cu(s) + 4H⁺(aq) + 4NO₃⁻(aq) ⟶ Cu²⁺(aq) + 2NO₃⁻(aq) + 2NO₂(g) + 2H₂O(ℓ)

<em>Net ionic equation </em>

Cu(s) + 4H⁺(aq) + 4NO₃⁻(aq) ⟶ Cu²⁺(aq) + 2NO₃⁻(aq) + 2NO₂(g) + 2H₂O(ℓ)

<em>Note</em>: The net ionic equation is <em>the same as </em>the ionic equation because there are <em>no common ions</em> to cancel on opposite sides of the arrow.

3 0
3 years ago
Compared to pure water, an aqueous solution of calcium chloride has what?
V125BC [204]
It has a higher boiling point and a lower freezing point
8 0
3 years ago
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