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lesya692 [45]
2 years ago
15

The purpose of an incline plane is to reduce which of the following?

Chemistry
2 answers:
QveST [7]2 years ago
4 0

The amount of force necessary to move an object.  


MA_775_DIABLO [31]2 years ago
3 0
The purpose of an inclined plane is to reduce force.
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Which of the following trends can be identified on the periodic table?
Jet001 [13]

Answer:

D) atomic radii increase from top to bottom of a group

Explanation:

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Other options are incorrect because,

A) atomic radii increase from left to right across the period

Correct = atomic radii decreases from left to right across the period

B) ionization energy increases from top to bottom within a family

Correct =  ionization energy decreases from top to bottom within a family

C) electronegativity decreases from left to right across a period

Correct = electronegativity increases from left to right across a period

8 0
3 years ago
Which factors may contribute to the extinction of a species? Check all that apply.
Genrish500 [490]

Answer:

Explanation:

1

2

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8 0
3 years ago
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Salts usually have a low melting point true or false
antoniya [11.8K]
Hello!

This is false!! It is the other way around. They usually have a very high melting point. For example table salt is around 800deg C which is approx just under 1500deg F.

Hope this helps. Thank you
3 0
3 years ago
What are 4 characteristics of metals
andriy [413]

Answer:

Metals have high densities, high melting points, are malleable and ductile, and can conduct heat and electricity.

Hope this helps as well! :)

7 0
3 years ago
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A sprinter set a high school record in track and field, running 200.0 m in 21.7 s . What is the average speed of the sprinter in
Yuliya22 [10]

Given data:

Distance travelled (d)= 200.0 m

Time taken (t) = 21.7 s

To determine:

The average speed in km/hr

Calculation:

Convert distance from m to km

1000 m = 1 km

200.0 m = 1 km * 200.0 m/1000 m = 0.2 km

Convert time from sec to hours

3600 sec = 1 hour

21.7 sec = 1 hour * 21.7 sec/3600 sec = 6.027 *10^-3 hrs

Speed is defined as the amount of distance travelled per unit time

Speed = distance/time = 0.2 km/6.027*10^-3 hr

           = 33.18 km/hr (or 33.2 km/hr)

7 0
3 years ago
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