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Zepler [3.9K]
3 years ago
8

PLEASE HELP WITH THIS QUESITION WILL GIVE BRAINLIST 2 BEST ANSWER.

Chemistry
1 answer:
Lera25 [3.4K]3 years ago
4 0

Answer: show all

Explanation:

today is my b\day

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A catalyst increases the rate of a reaction without being consumed. It accomplishes this by providing another mechanism that has
sineoko [7]

Answer: The given statement is true.

Explanation:

A catalyst is defined as the substance that lowers the activation energy of a chemical reaction without itself getting consumed so that there will be increase in rate of reaction.

As catalyst lowers the activation energy so, reactant molecules with lower energy also participates in the reaction. Hence, more collisions occur due to which there is rapid formation of products take place through another path.

Therefore, we can conclude that the statement a catalyst increases the rate of a reaction without being consumed. It accomplishes this by providing another mechanism that has a lower activation energy, is true.

5 0
4 years ago
Which molecule has the greatest difference in electronegativity (DE) between the two different elements? A. CO_2 B. H_2S C. NH_3
Natalka [10]

Answer:

Water has the greatest ΔEN

ΔEN H₂O → 3.4 - 2.1 = 1.3   Option D.

Explanation:

We should find the Electronegativity data in the Periodic table for all the elements:

C : 2.6

O: 3.4

H: 2.1

S: 2.6

N: 3.0

a. ΔEN CO₂ → 3.4 - 2.6 = 0.4

b. ΔEN H₂S → 2.6 - 2.1 = 0.5

c. ΔEN NH₃ → 3 - 2.1= 0.9

d. ΔEN H₂O → 3.4 - 2.1 = 1.3

3 0
4 years ago
How do you hold and move a flask if you are mixing chemicals?
erma4kov [3.2K]

Explanation:

Working in laboratory is very dangerous when working with chemicals. It can burn the skin if it falls or if someone comes in contact with it. We should always be alert and be careful while handling chemicals in the laboratory. Safety measure should always be followed like wearing gloves and aprons. While mixing chemicals, always hold the flasks straight right in front of you with the help of a crucible tong or a test tube holder and move straight.  

6 0
3 years ago
Read 2 more answers
The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time a
Licemer1 [7]

Answer:

No, it doesn't.

Explanation:

To convert ppb to mg/m³ we first need to convert to ppm, by just divide the amount by 1,000, so the concentration in the sample is 4.8 ppm.

mg/m³ = (ppm x molar mass)/molar volume

Using the molar mass in gram and the molar volume in liters, multiplying by the parts per million, we will get the concentration in mg/m³.

Molar mass of C = 12 g/mol; molar mass of Cl = 35.5 g/mol

Molar mass of CCl4 = 12 + 4x35.5 = 154 g/mol

Assuming, 25ºC and 1 atm, the molar volume of an ideal gas is 24.45 L, so:

mg/m³ = (4.8 x 154)/24.45

mg/m³ = 30.2

Which is higher than the limit of 12.6 mg/m³

6 0
3 years ago
Read 2 more answers
How has the human population changed in the past 50 years
bixtya [17]
The rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age. By 2000 the population counted 6 billion heads, however, population growth started to decline after 1965 because of decreasing birth rates
6 0
4 years ago
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