Answer:
we should conserve energy the reason are in the points
To less power plants
To promote health
To reduce dependence
To finite resources
To make a positive impact
Answer:
218.02 mL
Explanation:
Data Given:
weight of the empty beaker = 49.03 g
weight of water and beaker = 267.05 g
density of water = 1 g/mL
Solution:
As we know that the volume that beaker hold is the volume of water that occupied by it.
For this first we have to find mass of the water in the beaker
This can be calculated by the subtraction of beaker's weight from the weight of beaker and water.
weight of water (m) = total weight - weight of beaker
put values in the above formula
weight of water (m) = 267.05 g - 49.03 g
weight of water (m) = 218.02 g
To find volume we will use density formula
d = m/v
rearrange the above equation to calculate volume
v = m/d . . . . . . . (1)
put values in equation 1
v = 218.02 g / 1 (g/mL)
v = 218.02 mL
The volume that beaker hold = 218.02 mL
Answer: It is preferable to add excess bromobenzene instead of excess acetophenone because the reaction is exothermic and the addition of too much acetophenone causes the temperature to rise rapidly which may lead to an explosion.
Explanation:
The preparation of 1,1- diphenyl ethanol by reaction between bromobenzene and acetophenone is known as Grignard reaction.
The mechanism of this reaction is given in the adjoining image.
In this reaction, acetophenone is added slowly and in small amounts because this reaction is exothermic.
If a large quantity of acetophenone is added simultaneously, it can lead to the temperature rising too much in a short duration of time and may cause an explosion which may injure the person performing this reaction.
Also, too much acetophenone becomes an impurity which further hampers the reaction.
Therefore, it is preferable to add excess bromobenzene instead of excess acetophenone.
To know more about "Grignard Reaction", refer to the following link:
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Answer:
0.36g of Al
0.64g of S
Explanation:
Let us write a balanced equation for the decomposition of aluminium sulfide Al2S3. This is shown below:
Al2S3 —> 2Al + 3S
Molar Mass of Al2S3 = (2x27) + (3x32) = 54 + 96 = 150g/mol
Molar Mass of Al = 27g/mol
Mass of Al from the balanced equation = 2 x 27 = 54g
Molar Mass of S = 32g/mol
Mass of S from the balanced equation = 3 x 32 = 96g
Now we can obtain the mass of Al and S produce as follows:
For Al:
From the equation,
150g of Al2S3 produced 54g of Al.
Therefore, 1g of Al2S3 will produce = 54/150 = 0.36g of Al.
For S:
From the equation,
150g of Al2S3 produced 96g of S.
Therefore, 1g of Al2S3 will produce = 96/150 = 0.64g of S
Answer:
A B C D (all of the above)
Explanation:
Weak acid do not have a much hydrogen ions when in liquids or aqueous solutions. Examples of weak acids include vinegar, citric acid (from oranges, lemons, etc)