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kykrilka [37]
3 years ago
5

When does a physical change occur

Chemistry
2 answers:
sweet [91]3 years ago
8 0

A physical change occurs when something is altered. Such as cutting a piece of paper or chopping a piece of wood into pieces.  Melting ice, breaking glass, evaporating liquids are go through a physical change.

riadik2000 [5.3K]3 years ago
6 0

Physical changes occur when substances are mixed but don't chemically react.

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What do methanol (CH2O), ethanoic acid (C2H4O2), and glucose (C3H6O3) all have in common?
tatyana61 [14]

Answer:

d

Explanation:

Carbohydrates are compounds containing carbon, hydrogen, and oxygen. Therefore, a is true.

An empirical formula is the simplest ratio of atoms present in a compound. Therefore, C2H4O2 and C3H6O3, (if you simplified them like you would a fraction) would be CH2O. Therefore b is correct,

They also have the same % composition, with a ratio of 1 carbon : 2 hydrogen : 1 oxygen. Therefore, c is correct.

Since a, b and c are all correct, the answer is d, all of the above are true.

6 0
4 years ago
Is the prime meridian a longitudinal or latitudinal line?
Nesterboy [21]

Answer:

longitudinal

Explanation:

A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides a spheroid into two hemispheres.

4 0
3 years ago
A longer growing season is a result of
vredina [299]

Answer: <u><em>Hope this helps</em></u>

<u><em /></u>

<h3>Explanation:</h3><h3> <u><em>The growing and flowering seasons of plants will start earlier as a result of an earlier spring caused by warmer conditions. The growing and flowering season will most likely also last longer, resulting in increased plant growth.</em></u></h3><h3><u><em /></u></h3>
5 0
4 years ago
Read 2 more answers
Which of the following is an example of a negative tropism?
salantis [7]

C—stems and leaves growing upward?


7 0
3 years ago
Paul determines that the hydrogen ion concentration of his unknown solution is 3.60×10^-5 M. what is the pH of this solution?​
vivado [14]

Answer:

<h2>pH = 4.44 </h2>

Explanation:

The pH of a substance can be found by using the formula

p H  =  -   log[ H^{ + }  ]

where [ H+ ] is the hydrogen ion concentration of the solution

From the question

[ H + ] = 3.60 × 10^-5 M

So the pH is

pH =  -  log(3.60 \times  {10}^{ - 5} )  \\  =4.44369749923

We have the final answer as

<h3>pH = 4.44 </h3>

Hope this helps you

4 0
3 years ago
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