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2 years ago

All the mixture are harmful for us. is this statement true? justify with two examples

Chemistry

2 answers:

Natasha2012 [34]2 years ago

8 0

Answer:

no some of mixture are useful

Explanation:

h2 and o2 to form water

Taya2010 [7]2 years ago

3 0

Answer:

no.it is false.some are useful.like mixture of h2 and O 2 to form water.

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In the front of the room, there is a bottle that contains a 32.00 g sample of sulfur. This is

Vera_Pavlovna [14]

6.02x10^23 atoms is the answer

8 0

3 years ago

A 0.0000792 M sample of Compound X in a solvent has an absorbance of 0.341 at 528 nm in a 1.000-cm cuvet. The solvent alone has

natima [27]

Answer:

a) a = 3485 M⁻¹cm⁻¹

b) C = 0,000127 M

Explanation:

Lambert-Beer law says that there is a linear relationship between absorbance and concentration of a chemical substance. The formula is:

A = a×b×C

Where A is absorbance, a is molar absorptivity, b is path length and C is concentration.

a) In the problem Concentration is 0.0000792 M, b is 1,000cm and Absorbance is absorbance of sample-absorbance of blank: 0,341-0,065 = 0,276

Replacing:

0,276 = a×1,000cm×0,0000792M

a = 3485 M⁻¹cm⁻¹

b) As the experiment consist in the same compound in the same solvent, the molar absorptivity will be the same, a = 3485 M⁻¹cm⁻¹, path length will be 1,000cm and absorbance: 0,508-0,065 = 0,443

Replacing:

0,443 = 3485 M⁻¹cm⁻¹×1,000cm×C

C = 0,000127 M

I hope it helps!

8 0

3 years ago

If 2.65 mol of O2 gas has a volume of 49.0 L at 180 C, what is the pressure of the gas?

adoni [48]

Answer:

2.01atm

Explanation:

5 0

3 years ago

2a. Write down the names of the new substances formed when each of the following substance reacts with dilute hydrochloric acid.

Naddika [18.5K]

Answer:

i) Dilute hydrochloric acid will react with Ammonia to form ammonia salt.

ii) dilute hydrochloric acid will react with soduim hydroxide to form sodium chloride and water

iii) dilute hydrochloric acid will react with calcuim carbonate to form Calcium chloride, Carbon dioxide and water.

Explanation:

CHEMICAL EQUATIONS :

I) HCL + NH3 = NH4Cl

ii) HCL+ NaOH = NaCl + H2O

iii) HCL + CaCo = CaCl2 + CO2 + H2O

7 0

2 years ago

Read 2 more answers

Please help me there is 19 questions

cupoosta [38]

Answer:

1. Hubble

2.Aristarchus

3.Galileo

4.Aristotle

5.Kepler

6.Jupiter

7.Mercury

8.Uranus

9.Venus

10.Earth

11. Jupiter and Mars

12. sun

13.D

14. Saturn

15.Gas giants

16.Kuiper Belt and Ceres,Pluto,eris and haumea.

17.pluto

18.Ptolemy's model

19.meteor- a small body of matter from the outer surface that enters the earth's atmosphere.

meteoroid- a small body moving in the solar system that would become a meteor if it enters the earth's atmosphere.

meteorite- a piece of rock or metal that has fallen to the earth's surface from outer space as a meteor.

the relationship is the diagram I drew at the top.

hope this was helpful

6 0

3 years ago

All the mixture are harmful for us. is this statement true? justify with two examples​

All the mixture are harmful for us. is this statement true? justify with two examples