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Mkey [24]
3 years ago
14

List the FOUR examples of physical changes shown in the video. Why are these physical changes?

Chemistry
1 answer:
s344n2d4d5 [400]3 years ago
6 0

Explanation:

A physical change is a change that alters the physical properties of matter most especially the state and the form. This change has the following attributes.

  • it is easily reversible
  • leads to the production of no new kinds of matter
  • involves no change in mass
  • requires little energy

Therefore, some of the examples of physical changes are:

  • boiling
  • melting
  • freezing
  • condensation
  • sublimation
  • magnetization of metals
  • breaking of glass
  • cutting of wood
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Carbon-14 has a half-life of approximately 5700 years. How much of a 1000g sample will be left undecayed and still radioactive a
Artist 52 [7]

Answer:

option C is correct (250 g)

Explanation:

Given data:

Half life of carbon-14 = 5700 years

Total amount of sample = 1000 g

Sample left after 11,400 years = ?

Solution:

First of all we will calculate the number of half lives passes during 11,400 years.

Number of half lives = time elapsed/ half life

Number of half lives = 11,400 years/5700 years

Number of half lives = 2

Now we will calculate the amount left.

At time zero = 1000 g

At first half life = 1000 g/2 = 500 g

At second half life = 500 g/2 = 250 g

Thus, option C is correct.

4 0
3 years ago
Which of the following is an example of a phase change from liquid to gas?
netineya [11]
Correct answer to this question is c. water evaporating
6 0
3 years ago
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How do I balance chemical equations ?<br>​
Maru [420]

Answer & explanation:

To balance a chemical equation, we must make sure that there are equal amounts of each element in the equation on either side.

To balance an equation step-by-step we first start by counting the amount of each element on each side. If they aren't equal, we must make them amounts equal on either side.

After you make sure all the elements are balanced, the net charge on both sides must also be equal.

8 0
3 years ago
Calculate the standard emf for the following reaction:
krek1111 [17]
In order to solve this, we need to know the standard cell potentials of the half reaction from the given overall reaction.
The half reactions with their standard cell potentials are:
<span>2ClO−3(aq) + 12H+(aq) + 10e- = Cl2(g) + 6H2O(l) 
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</span>
We solve for the standard emf by subtracting the standard emf of the oxidation from the reducation, so:
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What is the total mass of water formed when 8 grams of hydrogen reacts completely with 64 grams of oxygen?
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7 0
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