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gladu [14]
4 years ago
13

Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

Chemistry
1 answer:
jek_recluse [69]4 years ago
6 0
Physical because it doesn't do with fire
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Please help I need it
lubasha [3.4K]

Answer : The structure are shown below and the number of stereoisomers are possible in 3,5-dimethylnonane and 3,7-dimethyle-5-ethyldecane are 4 and 8 respectively.

Explanation :

Chiral carbon : It is carbon which is attached to the different types of atoms or molecules.

The number of stereoisomers possible for a compound is related to the number of chiral centers (n) present in it as,

\text{Number of stereoisomers}=2^n

where,

'n' is the number of chiral carbon present in the compound.

The number of chiral carbon present in 3,5-dimethylnonane is, 2 that means n = 2 (carbon-3 and carbon-5)

\text{Number of stereoisomers}=2^n=2^2=4

The number of stereoisomers are possible in 3,5-dimethylnonane is, 4

The number of chiral carbon present in 3,7-dimethyle-5-ethyldecane is, 3 that means n = 3 (carbon-3, carbon-5 and carbon-7)

\text{Number of stereoisomers}=2^n=2^3=8

The number of stereoisomers are possible in 3,7-dimethyle-5-ethyldecane is, 8

4 0
3 years ago
if an exothermic reaction takes place in an insulated container at the end of the reaction the temperature of the content of the
ch4aika [34]

Answer:

Remain the same.

Explanation:

The reaction of the temperature of the content of the container will remain the same because no heat energy is transfer from the container to the external environment due to insulating material of the container. Insulators are poor conductor of heat and electricity so the container is unable to absorb the heat energy produced during a chemical reaction and all energy of the product remain the same.

8 0
3 years ago
The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. what is the percent yield? 75.0 56.0
Ronch [10]
I believe the percent yield is 56% if going by the formula of mass of actual yield/theoretical yield x 100%/
3 0
4 years ago
The number of atoms in a grapefruit would be equivalent to
frozen [14]

Answer:

C) The number of blueberries that would fit into the world

Explanation:

8 0
3 years ago
Read 2 more answers
HELPPPPPPPPPPPP
erica [24]

Answer:

Pressure inside soda can = 5.56 atm

Explanation:

Given data:

Initial volume = 1250 mL

Initial pressure = 1.00 atm

Final volume = 225  mL

Final pressure = ?

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

1.00 atm × 1250m L =  P₂ × 225 mL

P₂ =  1250 atm. mL/ 225 mL

P₂ = 5.56 atm

8 0
3 years ago
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