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MA_775_DIABLO [31]
3 years ago
9

Density is mass per I'm it of volume. Which pair of lab instruments would a student use to measure the density of a seawater

Chemistry
1 answer:
kati45 [8]3 years ago
5 0
Density can be measured by D=Volume/mass
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What can be said about an Endothermic reaction with a negative entropy change?The reaction isa. spontaneous at all temperatures.
Lyrx [107]

Answer:

1. d. The reaction is spontaneous in the reverse direction at all temperatures.

2. c. The reaction is spontaneous at low temperatures.

Explanation:

The spontaneity of a reaction is associated with the Gibbs free energy (ΔG). When ΔG < 0, the reaction is spontaneous. When ΔG > 0, the reaction is non-spontaneous. ΔG is related to the enthalpy (ΔH) and the entropy (ΔS) through the following expression:

ΔG = ΔH - T. ΔS  [1]

where,

T is the absolute temperature (T is always positive)

<em>1. What can be said about an Endothermic reaction with a negative entropy change?</em>

If the reaction is endothermic, ΔH > 0. Let's consider ΔS < 0. According to eq. [1], ΔG is always positive. The reaction is not spontaneous in the forward direction at any temperature. This means that the reaction is spontaneous in the reverse direction at all temperatures.

<em>2. What can be said about an Exothermic reaction with a negative entropy change?</em>

If the reaction is exothermic, ΔH < 0. Let's consider ΔS < 0. According to eq. [1], ΔG will be negative when |ΔH| > |T.ΔS|, that is, at low temperatures.

3 0
3 years ago
Programs that award certificate that u can help in securing jobs are called​
leonid [27]

vocational or technical education programs.

Explanation:

A vocational or technical education program is one that awards certificate that can help in securing jobs.

In a vocational or technical program, one is studying for a specific job role. It involves and hands on practical processes within a short period of time possible that makes one viable for some roles.

Examples are IT technician, Welders, Carpentry etc

learn more:

Job hazards brainly.com/question/3193019

#learnwithBrainly

7 0
4 years ago
Calculating the expected pH of the buffer solution: Given that the pKa for Acetic Acid is 4.77, calculate the expected pH of the
ser-zykov [4K]

Answer:

pH=4.77

Explanation:

From the question we are told that:

pKa for Acetic Acid pK_a= 4.77

Therefore

For Equal Concentration of acetic acid and acetatic ion

CH_3COOH=CH_3COO^-

Generally the Henderson's equation for pH value is mathematically given by

pH=pK_a+log\frac{base}{acid}

pH=4.77+log\frac{CH_3COO^-}{CH_3COOH}

pH=4.77+log1

pH=4.77

5 0
3 years ago
Hello it's my new id myself numu ​
zavuch27 [327]

Answer:

Hi numu !

How are you .

:D

Hope you have nice time

7 0
3 years ago
Read 2 more answers
An object has a mass of 180 kg and a volume of 90 m3. what is its density?
Murljashka [212]
Divide 180kg and 90m3 and your density will be 2kg/m3
8 0
3 years ago
Read 2 more answers
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