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VMariaS [17]
3 years ago
15

What substance, if added to the mixture of salt and sand, could be separated from the mixture using a sieve?

Chemistry
1 answer:
PSYCHO15rus [73]3 years ago
7 0

Answer:

flour

Explanation:

i'm not really for sure.

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I NEED UR HELPPPP I HAVE TO SUBMIT IT IN 10 MINS!!!! PLEASE I HAVE NO IDEA
Vilka [71]

Explanation:

6/t1=4/293= 1750/4 =439.5-273=166.5

4 0
3 years ago
How much energy in joules does it take to raise the temperature of 1.5kg of aluminum from 20c to 40c
Leviafan [203]

Answer:

Q = m * c * ΔΤ

ΔΤ = 40-20 = 20

Q = 1.5kg * 0.9 * 20

Q = 27j

4 0
3 years ago
Which of the following is not a conjugate acid-base pair? A) NH4+/NH3 B) H30-OH OC) H2SO3/HSO3 D) C2H302-/HC2H302
raketka [301]

Answer : The option (d) is not a conjugate acid-base pair.

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

(a) The equilibrium reaction will be,

NH_4^++OH^-\rightleftharpoons NH_3+H_2O

In this reaction, NH_4^+/NH_3 are act as a conjugate acid-base.

(b) The equilibrium reaction will be,

H_3O^++OH^-\rightleftharpoons H_2O+H_2O

In this reaction, H_3O^+/OH^- are act as a conjugate acid-base.

(c) The equilibrium reaction will be,

H_2SO_3+OH^-\rightleftharpoons HSO_3^-+H_2O

In this reaction, H_2SO_3/HSO_3^- are act as a conjugate acid-base.

(d) The equilibrium reaction will be,

C_2H_3O_2^-+H_2O\rightleftharpoons HC_2H_3O_2+OH^-

In this reaction, C_2H_3O_2^-/HC_2H_3O_2 are act as a conjugate base-acid.

Hence, from this we conclude that, the option (d) is not a conjugate acid-base pair but it is a act as conjugate base-acid.

6 0
3 years ago
Consider the following reaction mechanism:
snow_lady [41]

Answer:

  • <em><u>Step 2 (the slow step).</u></em>

Explanation:

The rate-determining step is always the slow step of a mechanism.

That is so, because it is the slow step which limits the reaction.

Imaging that for assembling a toy you have process of three steps:

  • 1. order ten pieces, which you can do in 1 minute: meaning that you can order order the pieces for 60/1 = 60 toys in 1 hour.

  • 2. glue the pieces and hold the toy until the glue hardens, which takes 1 hour: meaning finishingh 1 toy in 1 hour.

  • 3. pack the toy, which takes 2 minutes: meaning that you can pack 60/2 = 30 toys in one hour.

The time to glue and hold one toy until the glue hardens determines that you can assemble 1 toy in 1 hour and not 60 toys or 30 toys.

Thus, the step that determines the rate at which the reaction happens is the slowest step: step 2.

3 0
3 years ago
Read 2 more answers
Looking at the molecule images above, could the molecules of air get into the blood from the lungs? Why or why not? (Select ALL
valkas [14]

Answer:

b and d

Explanation:

7 0
2 years ago
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