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nirvana33 [79]
3 years ago
9

How can you remove energy from matter?

Chemistry
1 answer:
valentinak56 [21]3 years ago
7 0

Answer:

you can remove energy from the matter by lowering its temperature

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The purpose of the salt bridge in an electrochemical cell is to ____.
IgorLugansk [536]

Answer:

A. maintain electrical neutrality in the half-cells via migration of ions

Explanation:

Salt bridge -

For an electrochemical reaction , involving an anode and a cathode , both the electrodes are connect via a salt bridge to complete the circuit for the reaction .

One of the very important use of a salt bridge is to maintain the electrical neutrality of the respective half cells , which is achieved by the movement of ions .

Hence , from the given options , the correct option is ( a ) .

8 0
3 years ago
Determine the heat energy needed to raise the temperature of 120 grams of ice at -5 to steam at 115°
CaHeK987 [17]

Answer:

Q = 30355.2 J

Explanation:

Given data:

Mass of ice = 120 g

Initial temperature = -5°C

Final temperature = 115°C

Energy required = ?

Solution:

Specific heat capacity of ice is = 2.108 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = m.c. ΔT

ΔT = T2 -T1

ΔT = 115 - (-5°C)

ΔT = 120 °C

Q = 120 g × 2.108 j/g.°C × 120 °C

Q = 30355.2 J

5 0
3 years ago
The road map in the text shows that to convert from one unit to another, you must use the ____ as an intermediate step. ___ conv
jonny [76]

Answer:

Conversion factor;

Molar mass;

Avogadro's constant and molar mass

Explanation:

  • Firstly, an intermediate step is to define the conversion factor that will be then used in a conversion technique called dimensional analysis in order to convert from one unit to another. An example of a conversion factor would be, for example, 1 L = 1000 mL, which can be manipulated as a fraction, either \frac{1 L}{1000 mL} or \frac{1000 mL}{1 L};
  • Secondly, in order to convert mass to moles, we need to know the molar mass of a compound which has a units of g/mol (that is, it shows how many grams we have per 1 mole of substance.
  • Thirdly, Avogadro's constant, N_A = 6.022\cdot 10^{23} mol^{-1} tells us that there is N_A number of molecules or atoms in 1 mole of substance. We need two conversion factors to convert the number of molecules to a mass: firstly, we need to convert the number of molecules into the number of moles using Avogadro's constant and then we need to use the molar mass to convert the moles obtained into mass.
5 0
3 years ago
What is the mass of a steel cylinder that has a density of 75.0 g/mL and a volume of 12 mL?
siniylev [52]
<span>
hey there!:

density = 75.0 g/mL

Volume = 12 mL

mass = ?

Therefore:

D = m / V

75.0 =m / 12

m = 75.0 * 12

m = 900 g

Answer B

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5 0
3 years ago
Read 2 more answers
Which is being developed by chemists to supplement fossils fuels?
MaRussiya [10]

Answer:

bio diesel

Explanation:

bio diesel is a recent development to supplement fossil fuels

8 0
3 years ago
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