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taurus [48]
3 years ago
8

True or False. Physical changes result in the formation of a new substance.

Chemistry
1 answer:
Umnica [9.8K]3 years ago
3 0

Answer:

1. false

2. true

Explanation:

I hope this helps

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hram777 [196]
The atmosphere provides C02 for us, it protects us from the Sun's UV rays, it protects us from many objects in space that could crash into earth without it, and it holds the moisture in the air.
8 0
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How do you calculate net force?
bogdanovich [222]
How to find net force

The net force is the vector sum of all forces act upon an object.

The formula to calculate net force is Fnet = ma
where the net force is equal to the mass of an object (in Kg) multiplied by the acceleration of the object (in meters per second squared)

You may also calculate the net force acting upon an object with Fnet = Fa + Ff
where the net force is equal to the sum of the applied force and the force of friction.


hope that helped

3 0
3 years ago
1) Humans have how many sets of teeth?
Verizon [17]
<span>1) Humans have how many sets of teeth?

C) 4

2) Adults have how may permanent teeth?

B) 32

3) What type of food products make teeth stronger?

Cheese and Yogurt

4) What is the visible part of the tooth?

C) crown



5) What part of the tooth is harder than bone?

D) dentin


6) What part of the tooth is soft and contains the nerves?
A) pulp


7) What refers to the alignment of the teeth?
</span><span>
Occlusion</span><span>

8) The lower teeth protect what?

D) tongue


9) Malocclusion is the least common reason for referral to orthodontists.

False



10) Usually, malocclusion is hereditary.
True


11) Which type of malocclusion is commonly referred to as an overbite?

Class Two

12) Bacteria are living organisms than cause cavities.
True




13) What is the whitish film that grows on your teeth called?

Plaque 

14) What is the best fighter of cavities?

Fluoride

Gingivitis is the inflammation of the
A) gums



16) Gingivitis is permanent.

False


17) Name 2 ways to fight gingivitis.

Proper Toothbrushing and Flossing
</span>Professional Dental Cleanings<span>

18) The cause of gum disease is

B) bacteria



19) Untreated, periodontitis will progress until your teeth loosen and fall out.
True


</span>
6 0
3 years ago
What is the total number of sublevels in the fourth principal energy level
Yuki888 [10]
The answer is 4. It can hold 4 sublevels as s.p,d,f and it holds 32 electrons
8 0
3 years ago
Water boils at 212 degrees
max2010maxim [7]

Answer:

Fahrenheit

Explanation:

Bc i said so LOL JKJK ABAHGTRDSED

5 0
3 years ago
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