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Agata [3.3K]
3 years ago
10

State two differences between physical change and chemical change

Chemistry
2 answers:
Lubov Fominskaja [6]3 years ago
6 0

Answer:

See explanation

Explanation:

1) Physical change is usually reversible, while chemical change isn't

2) Chemical change involves the change of chemical composition of matter while physical change doesn't

katovenus [111]3 years ago
6 0

Answer:

1. Physical changes only change the physical attributes of a substance, such as color or state, while chemical changes affect chemical composition.

2. In physical changes, no new energy or substances are produced.

Explanation:

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When Aluminum foil is added to a solution of Copper (II) chloride (blue color solution), the following reaction occurs.
zimovet [89]
I think is b................
7 0
2 years ago
In which of the following situations is the greatest amount of work accomplished?
Dahasolnce [82]

<span>work = force x distances </span>

<span>A - moving 2 newton's up 0.6 meter = 1.2 joules
B - moving 4 newton's up 0.6 meter = 2.4 joules
C - moving 6 newton's up 0.3 meter = 1.8 joules
D - moving 9 newton's up 0.3 meter = 2.7 joules
The greatest amount of work is in example D. 
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<span>
 D is your answer. </span>

7 0
3 years ago
Read 2 more answers
Can someone help me please ?
KiRa [710]

Answer: B

Explanation:

Graph 1 represents an endothermic reaction, Graph 2 represents an exothermic reaction.

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3 0
3 years ago
Read 2 more answers
What is the osmotic pressure, in torr, of a 3.00% solution of NaCl in water when the temperature of the solution is 45 ºC? Enter
Anit [1.1K]

213034 torr is the osmotic pressure.

Explanation:

osmotic pressure is calculated by the formula:

osmotic pressure= iCrT

where i= no. of solute

c= concentration in mol/litre

R= Universal Gas constant

T = temp

It is given that solution is 3% which is 3gms in 100 ml.

let us calculate the concentration in moles/litre

3gm/100ml*1000ml/1L*1mol NaCl/55.84g NaCl

= 5.372 gm/litre

Putting the values in the formula,                   Temp in Kelvin 318.5K

osmotic pressure= 2*5.372*0.083 * 318.5                 Gas constant  0.083

                              = 284.023 bar or 213018 torr.                 c=  5.372 moles/L                                                                              

                                                                                    i=2 for NaCl

4 0
3 years ago
You need to determine the specific gravity of a sample. After putting the sample on a lab scale, you know it has a mass of 85 gr
BlackZzzverrR [31]

Answer:

Specific gravity of the sample = 8.947

Explanation:

Specific gravity of a substance is defined as the density of that substance divided by the density of water.

Density of water = 1000g/l

Density of substance = mass/volume

= 85/9.5 x 10^-3

= 8947.37 g/l

SG = 8947.37/1000

= 8.947

3 0
3 years ago
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