What is an example of a physical change

2 answers:

6 0

A physical change can be something like breaking into pieces. a physical change is when the chemical makeup is not changed. anything like corrosion, burning, or anything like that will be chemical.

igomit [66]3 years ago

3 0

Crushing can, breaking glass, boiling water, shredding paper

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Arisa [49]

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At what step of glycolysis one NADH+ H+ is formed?

ElenaW [278]

Answer:

During Glycolysis, there is one step where NADH + H+ is formed from NAD+ O F-6-P - F- 1,6-BP O PGAL – 1,3-BPGA O 2-PGA - PEP O 3-PGA → 2-PGA.

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3 years ago

*BRAINLIEST* Is calcium nitrate solution an element, compound, homogenous mixture, or heterogeneous mixture?

murzikaleks [220]

Answer:

It's a compound.

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The celestial bodies in space move about in predictable paths called blank . As a result, a planet is able to blank around the S

rewona [7]

Answer:

Gravity

Explanation:

All matter exerts a force, which is called , that pulls all other matter towards its center. The strength of the force depends on the mass of the object: the Sun has more gravity than Earth, which in turn has more gravity than an apple. Also, the force weakens with distance. Objects far from the Sun won’t be influenced by its gravity.

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3 years ago

Q 2.1 Benz aldehyde and hydrogen cyanide fail to react at pH=5.6 and slowly at pH=7. However, the reaction occurs spontaneously

Irina18 [472]

Answer:

Explanation has been given below

Explanation:

Rate law = $k[benzaldehyde][CN^{-}]$ , where k is rate constant and species inside third bracket represents concentrations.
Clearly, rate depends upon concentration of free $CN^{-}$

In acidic medium (pH = 5.6), concentration of free $CN^{-}$ is negligible as HCN is a weak acid. So, reaction between benzaldehyde and HCN does not occur at all.
In neutral medium (pH = 7), concentration of cyanide ion somewhat increases. Therefore reaction is slow in neutral pH
In basic medium (pH > 7), concentration of cyanide ions become sufficient to make the reaction spontaneous. In basic condition, concentration of cyanide increases due to increase in ionization of HCN
Full reaction mechanism has been shown below.

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3 years ago