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Dmitrij [34]
3 years ago
15

All of the following can increase the rate of chemical reaction EXCEPT:

Chemistry
1 answer:
dangina [55]3 years ago
5 0

Except catalyst because catalyst typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

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Help me with 15 16 17 and 18 please thank you so much
Oksana_A [137]
15.c
16.the law of conservation of mass state that mass in a isolated system is niether created or destroyed.
17.you can prove that dissolving salt is a physical change by evaporating the water to separate the two.
4 0
3 years ago
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A ball is launched from a spring on the floor with an initial velocity of 32 m/s. it then comes to a stop in 4.3 seconds. Determ
monitta

Answer:

-7.4m/s2

Explanation:

3 0
3 years ago
What is the symbol, atomic number, atomic mass, # of protons, # of neutrons, # of electrons, ion charge for the beryllium ion?
jolli1 [7]

Answer:

Symbol Be

atomic number 4

protons 4

neutrons 5

electrons 4

ion charge +2

Explanation:

Look at the periodic table and all the answers can be found there. If you would like to learn how to find them please message me below.

8 0
3 years ago
A sample of NO2 in a 1550 mL metal cylinder at 70.26 kPa has its temperature changed from 480oC to -237oC while its volume is si
antoniya [11.8K]

Answer:

1.02KPa

Explanation:

The following were obtained from the question:

V1 = 1550mL

P1 = 70.26kPa

T1 = 480°C = 480 + 273 = 753K

T2 = -237°C = - 237 + 273 = 36K

V2 = 5114mL

P2 =?

The final pressure can obtain as follows:

P1V1/T1 = P2V2/T2

(70.26x1550)/753 = (P2x5114)/36

Cross multiply to express in linear form as shown below:

P2 x 5114 x 753 = 70.26 x 1550 x 36

Divide both side by 5114 x 753

P2 = (70.26x1550x36)/(5114x753)

P2 = 1.02KPa

Therefore, the final pressure is 1.02KPa

3 0
3 years ago
At physiological ph, the ionized state of the carboxyl (cooh) group in the r group of aspartic acid is:
Wewaii [24]
Answer is: the ionized state of the carboxyl group is COO⁻.
Physiological pH is 7,4 and carboxyl group in the R group has pKa = 3,7. Since this pKa is lower than phys<span>iological pH of 7,4, carboxyl group (COOH) will lost proton, and because of that it will be deprotonated and will have negative charge.
</span>Aspartic acid<span> is an α-amino acid that is used in the biosynthesis of proteins.</span>
3 0
3 years ago
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