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3 years ago

The point in a titration at which the indicator changes is called the

Chemistry

1 answer:

irakobra [83]3 years ago

8 0

Answer:

End point

Explanation:

The point at which the indicator changes color is called the endpoint. So the addition of an indicator to the analyte solution helps us to visually spot the equivalence point in an acid-base titration

#correct me if I'm wrong

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20 points and brainliest for best answer

RSB [31]

Gold/Atomic mass

196.96657 u ± 0.000004 u

Potassium/Atomic mass

39.0983 u ± 0.0001 u

Francium/Atomic number

87

Copper/Atomic mass

63.546 u ± 0.003 u

Bromine/Atomic mass

79.904 u ± 0.001 u

Arsenic/Atomic number

33

7 0

3 years ago

Read 2 more answers

Identify the arrows that show removal of thermal energy when matter changes state.

BARSIC [14]

When matter loses heat, one of the following happens:
Liquid changes to solid (freezing), or
Gas changes to liquid (condensation), or
Gas changes to solid (deposition)

1- Freezing: when the temperature of a liquid matter drops below its freezing point, the liquid usually solidifies forming crystals. Example of this is when water changes to ice
2- Condensation: when the temperature of gas is reduced, the molecules slow down and come together changing the matter into liquid. Example of this is when water vapor condenses into water droplets.
3- Deposition: Sometimes when the temperature of a gas drops, it solidifies directly without passing through the liquid phase. An example of this is when water vapor changes directly to ice in sub-freezing areas without passing through the liquid phase. This is the process through which clouds are formed.
The diagram below shows these three changes in matter.

6 0

3 years ago

8. 53.4 mL of a 1.50 M solution of NaCl is on hand, but you need some 0.800 M

bulgar [2K]

8. 100.13 ml
9. 75 ml
10. 1066.7 ml, hope that's help

6 0

3 years ago

Calculate the pH of an aqueous solution that is 0.020 M in HCl(aq) at 25°C.

sdas [7]

Hope this helps you!

7 0

3 years ago

A mixture of gases A2 and B2 are introduced to a slender metal cylinder that has one end closed and the other fitted with a pist

REY [17]

Answer:

q < 0, w > 0, the sign of ΔE cannot be determined from the information given

Explanation:

Determination of sign of q

Temperature of the water bath before the reaction = 25 °C

Temperature of the water bath after the completion of the reaction = 28 °C

After the completion of the reaction, temperature of the water bath is increased that means heat is released during the reaction and flows out of the system.

If heat is absorbed by the system, then q is indicated by positive sign and if heat is released by the system, then q is indicated by negative sign.

As in the given case, heat is released by the system, so sign of q is negative, or q < 0

Determination of sign of w

After the completion of the reaction, piston moved downward, that means volume of the system decreases or compression occur. During the compression, work is done on the system.

if work is done on the system, sign of w is positive.

If work is done by the system, sign of w is negative.

In the given case, work is done on the system, therefore sign of w is positive, or w > 0

Determination of sign of ΔE

Relationship between ΔE, q and w is given by first law of thermodynamics:

ΔE = q + w

In this case, q is positive and w is negative, so the sign of ΔE depends of magnitude of q and w. As magnitude of w and q cannot be determined in this case, thus, the given information is insufficient for the determination of sign of ΔE.

So, among the given option, option c is correct.

q < 0, w > 0, the sign of ΔE cannot be determined from the information given

3 0

3 years ago