1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ololo11 [35]
3 years ago
8

I'll give the first person with all the correct answers brainliest

Chemistry
2 answers:
Alexxx [7]3 years ago
7 0

Answer:

1 A.

2 A.

3 B.

4 D

best of luck! :)

DedPeter [7]3 years ago
7 0
1. C
2. B
3. A
4. D

i hope this helped!
You might be interested in
Osmosis is the passage of water molecules through a semi-permeable membrane from a solution of ________ concentration to _______
grandymaker [24]

Osmosis is the passage of water molecules through a semi-permeable membrane from a solution of ___lower_____ concentration to ___higher_____ concentration.

3 0
3 years ago
On increasing which of the following factors, decreases the extent of physisorption? Surface area of the adsorbent Critical temp
Citrus2011 [14]

Answer: On increasing temperature at which adsorption is carried out decreases the extent of physisorption.

Explanation:

An adsorption where molecules of the adsorbate are placed or held on the surface of adsorbent by Vander waals forces is called physisorption.

There is basically physical bonding between the molecules of gas to the surface of a solid or liquid.

Physisorption is reversible in nature and occurs at low temperatures.

It is not specific in nature which means that all gases are adsorbed on the surface of every solid substance to some extent.

Thus, we can conclude that on increasing temperature at which adsorption is carried out decreases the extent of physisorption.

4 0
3 years ago
A gas mixture at 535.0°C and 109 kPa absolute enters a heat exchanger at a rate of 67.0 m3/hr. The gas leaves the heat exchanger
SVEN [57.7K]

Answer:

the heat rate required to cool down the gas from 535°C until 215°C is -2.5 kW.

Explanation:

assuming ideal gas behaviour:

PV=nRT

therefore

P= 109 Kpa= 1.07575 atm

V= 67 m3/hr = 18.6111 L/s

T= 215 °C = 488 K

R = 0.082 atm L /mol K

n = PV/RT = 109 Kpa = 1.07575 atm * 18.611 L/s /(0.082 atm L/mol K * 488 K)

n= 0.5 mol/s

since the changes in kinetic and potencial energy are negligible, the heat required is equal to the enthalpy change of the gas:

Q= n* Δh = 0.5 mol/s * (- 5 kJ/mol) =2.5 kW

7 0
3 years ago
Whenever a continuous bell alarm sounds in the Chemistry building:
deff fn [24]

Answer:

C

Explanation:

This is essentially one of the several safety measures in the chemical laboratory. This particular approach is one used in the case of fire eventualities.

A is wrong

This is because in the advent of a fire incident, it is necessary to evacuate the building as a whole. Meeting in the hallway is still within the building which is not the right thing to do when there’s a fire outbreak. Occupants are expected to leave the building immediately

B. Is also wrong. Taking time to pack your belongings might make you be caught in the inferno. It is expected that you leave the building at once

4 0
3 years ago
Which of these statements best answers the question: What is art?
Anna11 [10]

Answer:

You didn't provide any statements. If it is an option, art is a form of expression. Something created from imagination that expresses the thoughts and emotions of the artist.

8 0
3 years ago
Other questions:
  • 1) Humans have how many sets of teeth?
    6·1 answer
  • What attractive force holds two hydrogen atoms and one oxygen atom
    9·1 answer
  • Red ( visible) light has a wavelength of 7×10-7m. How much energy does a photon if red light have?
    9·1 answer
  • In a redox reaction, how does the total number of electrons lost by the oxidized substance compare to the total number of electr
    6·1 answer
  • Is a formation of a limestone cave a physical change?
    10·1 answer
  • Percent composition?: 85.05 g of Mg combines completely with 112.21 g of S.
    11·1 answer
  • Match the scientist with their scientific idea. Question 2 options: Substances combine or break apart to create new, different s
    5·1 answer
  • Define by-products of petroleum?
    6·1 answer
  • A ball is kicked straight up. The ball's speed decreases as it moves upward. Why does the ball's
    7·1 answer
  • How many valence electrons are transferred to the oxygen atom from potassium atoms in the formation of the compound potassium ox
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!