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ladessa [460]
3 years ago
10

Both slicing a tomato and a chemical change such as burning toast cannot be reversed. However, why is slicing a tomato still con

sidered only a physical change?
Chemistry
2 answers:
iogann1982 [59]3 years ago
7 0

Physical changes do not change the chemical make up of a substance. Chemical changes do.

Slicing a tomato only changes its proportion and size (which are physical properties), instead of anything inside the tomato. while burning toast changes something inside the toast, making it a chemical change, instead of a physical change.

Molodets [167]3 years ago
3 0

Physical changes do not change the chemical make up of a substance. Chemical changes do.

Slicing a tomato only changes its proportion and size (which are physical properties), instead of anything inside the tomato.

Meanwhile, burning toast changes something inside the toast, making it a chemical change, instead of a physical change.

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If 5000 balloons are each filled with 0.5L then how many does each balloon have
Colt1911 [192]
ANSWER:

If 5000 balloons are each filled with 0.5L, then each balloon has 0.5L. The answer is in the question.

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3 years ago
If one mole of ozone gas has a mass of 47.997g, what is the mass of three moles of ozone gas?
Brums [2.3K]

Answer:

143.991

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3 0
3 years ago
A theater director reinterprets a play by replacing its classical score with
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Answer:

The play will be more  appealing to a younger audience.

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2 years ago
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At 25.0°c, a solution has a concentration of 3.179 m and a density of 1.260 g/ml. the density of the solution at 50.0°c is 1.249
oksano4ka [1.4K]

Answer: -

3.151 M

Explanation: -

Let the volume of the solution be 1000 mL.

At 25.0 °C, Density = 1.260 g/ mL

Mass of the solution = Density x volume

= 1.260 g / mL x 1000 mL

= 1260 g

At 25.0 °C, the molarity = 3.179 M

Number of moles present per 1000 mL = 3.179 mol

Strength of the solution in g / mol

= 1260 g / 3.179 mol = 396.35 g / mol (at 25.0 °C)

Now at 50.0 °C

The density is 1.249 g/ mL

Mass of the solution = density x volume = 1.249 g / mL x 1000 mL

= 1249 g.

Number of moles present in 1249 g = Mass of the solution / Strength in g /mol

= \frac{1249 g}{396.35 g/mol}

= 3.151 moles.

So 3.151 moles is present in 1000 mL at 50.0 °C

Molarity at 50.0 °C = 3.151 M

7 0
3 years ago
Match the following items. Match the items in the left column to the items in the right column. 1. general or nonspecific observ
ivann1987 [24]
when column B is like the attached pic: (missing in your question)

so the matches will be like that:

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as Qualitative is a general or nonspecific observation, they also don't require

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being approximated only. It  describes qualities and uses opinion

2- Hypothesis : 

as a hypothesis is an educated guess quantitative, and it is a prediction stated

in " If and then " form. a hypothesis to be valid need a research such as:

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3- Direct relationship:

as a Direct relationship is when two variable change in the same direction,

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4- Quantitative:

as Quantitative is a measured observation, It's an information or data based

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5- Control :

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6- Theory :

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 Scientifically acceptable general principles to explain phenomena. It the

general or abstract principles of the science. for example the  wave theory of

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7- Law :

as a law is a statement that explains what something does under the same

conditions. when we take about law in science, it is a general rule to explain

the observations in the form of a mathematical statement. Scientific law may 

be stated in words or expressed as a mathematical equations.

8- Best fit curve:

as best fit curve is a curve drawn to average the data's deviations direct

relationship. It is a process of constructing a curve that has best fit to a

series of data points. 

7 0
3 years ago
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