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HACTEHA [7]
3 years ago
9

What are five primary signs of a chemical change

Chemistry
1 answer:
MissTica3 years ago
5 0
1) size 
2) shape 
3)odor 
4)state  
5)form 
This is from my knowledge please make sure to check it before learning it. 
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Which best describes an element? A pure substance. A type of a mixture. A pure compound. An impure substance.
mr Goodwill [35]

a pure compound because an element is untouched and is just itself

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As the temperature of a liquid goes up, the average speed of its particles .This means that the kinetic energy of the particles
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The kinectic energy would be decreasing.
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3 years ago
Radar detectors use radio waves to measure the speed of moving
bagirrra123 [75]

Answer:

1.7x10^8 Hz

Explanation:

Frequency could be explained as the number of occurrences of a repeating event at a time

Given:

wavelength = 1.8 meters

The frequency f of the waves can be calculated using f = c / λ

Where c (m/s) is the speed of the wave

λ (m) is the wavelength

Speed c= 3*10^8 m/s

Frequency f= 3*10^8 /1.8

Frequency= 1.7x10^8 Hz

Therefore,the frequency of waves from a radar detector is 1.7x10^8 Hz

6 0
3 years ago
Need help with chemistry
AlekseyPX

Answer:

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Explanation:

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3 0
2 years ago
How does distillation work.
Usimov [2.4K]

Answer:

Distillation is an important commercial process that is used in the purification of a large variety of materials. However, before we begin a discussion of distillation, it would probably be beneficial to define the terms that describe the process and related properties. ... Elevation of the boiling point with an increase in external pressure, while important in cooking and sterilizing food or utensils, is less important in distillation.

Explanation:

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2 years ago
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