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Lerok [7]
3 years ago
8

An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and

Chemistry
2 answers:
Y_Kistochka [10]3 years ago
6 0

Answer:

the answer is the third one

emmainna [20.7K]3 years ago
5 0

Answer:

C brainliest

Explanation:

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A tire pressure gauge reads 33.0 pounds per square inch. How many kPa is this?
Andrej [43]

Answer:

227.5kpa

Explanation:

3 0
3 years ago
Which of the following best explains why electroplating is a useful process in many industries?
UkoKoshka [18]
Since I cannot find the choices, I will tell you some of the benefits of electroplating in different industries. You can compare these benefits with the choices you have and choose the best fit.

1- Forms a protective layer to protect the material from the conditions of the atmosphere as the corrosion

2- Improves the appearance of some inexpensive materials and makes them look more appealing

3- Can enhance the electrical conductivity of materials

4- electroplating of zinc-nickel or gold can survive high temperatures

5- Sometimes hardens the material

6- Increases the thickness of the material 
8 0
3 years ago
Read 2 more answers
For each of the following substituents, indicate whether it withdraws electrons inductively, donates electrons by hyperconjugati
aleksandrvk [35]

Answer:

Br- Withdraws electrons inductively

       Donates electrons by resonance

CH2CH3 - Donates electrons by hyperconjugation

NHCH3- Withdraws electrons inductively

              Donates electrons by resonance

OCH3 -  Withdraws electrons inductively

              Donates electrons by resonance

+N(CH3)3 - Withdraws electrons inductively

                   

Explanation:

A chemical moiety may withdraw or donate electrons by resonance or inductive effect.

Halogens are electronegative elements hence they withdraw electrons by inductive effect. However, they also contain lone pairs so the can donate electrons by resonance.

Alkyl groups donate electrons by hyperconjugation involving hydrogen atoms.

-NHCH3  and contain species that have lone pair of electrons which can be donated by resonance. Also, the nitrogen and oxygen atoms are very electron withdrawing making the carbon atom to have a -I inductive effect.

+N(CH3)3 have no lone pair and is strongly electron withdrawing by inductive effects.

3 0
3 years ago
What are fixed reference points on the Celsius thermometer
alukav5142 [94]

The fixed reference points on the Celsius thermometer is 0 and 100.

8 0
3 years ago
What is the molarity of 4.0 moles NaCI dissolved in 2.0 L of solution
Hunter-Best [27]

Answer:

What is the molarity of a solution containing 5.00 moles of kcl in 2.00L of solution? Molarity= moles of solute/volume of solution in litre , so the problem looks like this : 7/. 569 , which is equivalent to 12.302 M .

3 0
3 years ago
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