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LiRa [457]
3 years ago
7

ipt A wall that was once white is painted black. Which of the following is definitely true of the painted wall? A. Its chemical

properties have changed. B. Its physical properties have changed. C. Both its physical properties and chemical properties have changed. D. None of its characteristic properties have changed.​
Chemistry
2 answers:
Delvig [45]3 years ago
4 0
The answer would be C
Hope this helps
Julli [10]3 years ago
3 0

Answer:

B It's physical properties changed

Explanation:

Because they painted the outside

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Which of the following describes wind direction?
iren2701 [21]

Answer:

where the wind is going

Explanation:

direction is where something is going hope it helps

3 0
2 years ago
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What was the period of time in london called because of the cold temp​
eimsori [14]

I believe the answer is Caloric Theory

8 0
3 years ago
What are scientific models used for? Give an example of each of the follwoing types of models: idea, physical, computer
leva [86]

Answer:

Scientific models are used to explain phenomena that can not be experience directly and it is also used for prediction.

Explanation:

An example of idea model is the Eistein equation.  An idea model shows how things interact together to produce a particular result.

An example of physical model is the solar system.

Computer model is used to predict long term events and an example of this is computer simulations.

5 0
3 years ago
A proton transfer reaction can occur when an aldehyde is placed in strong base, such as an alkoxide ion, producing an alcohol an
Pani-rosa [81]

Hi, you have not provided structure of the aldehyde and alkoxide ion.

Therefore i'll show a mechanism corresponding to the proton transfer by considering a simple example.

Explanation: For an example, let's consider that proton transfer is taking place between a simple aldehyde e.g. acetaldehyde and a simple alkoxide base e.g. methoxide.

The hydrogen atom attached to the carbon atom adjacent to aldehyde group are most acidic. Hence they are removed by alkoxide preferably.

After removal of proton from aldehyde, a carbanion is generated. As it is a conjugated carbanion therefore the negative charge on carbon atom can conjugate through the carbonyl group to form an enolate which is another canonical form of the carbanion.

All the structures are shown below.

7 0
3 years ago
A compound consisting of B, N, and H undergoes elemental analysis. The % composition by mass is found to be 40.28% B, 52.20% N,
swat32

Empirical formula is the simplest ratio of components making up a compound.

The percentage composition of each element has been given

therefore the mass present of each element in 100 g of compound is

                      B                                   N                         H

mass          40.28 g                         52.20 g                 7.53 g

number of moles  

                 40.28 g / 11 g/mol      52.20 g / 14 g/mol    7.53 g / 1 g/mol

                = 3.662 mol                  = 3.729 mol             = 7.53 mol

divide the number of moles by the least number of moles, that is 3.662

                3.662 / 3.662              3.729 / 3.662              7.53 / 3.662

               = 1.000                           = 1.018                        = 2.056

the ratio of the elements after rounding off to the nearest whole number is

B : N : H = 1 : 1 : 2

therefore empirical formula for the compound is B₁N₁H₂          

that can be written as BNH₂    

3 0
3 years ago
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