Which describes the molecular behavior of a solid? I THINK IT'S A, BUT IM NOT SUREA. Molecules vibrate around a fixed point.
B. Molecules are too far apart to affect each other.
C. Molecules have the greatest energy of motion.
D. Molecules are rigid and do not move.

Answers

Answer 1

Answer: I also think it is A

Answer 2

Answer: Molecules in a solid should not be able to move. Otherwise it wouldn't be a solid! So the answer is D.

Hope this helps :) ~

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Which of the following is an example of a double replacement reaction? (a)3Fe + 2O2 Fe3O4
(b) BaCl2 + K2CO3 BaCO3 + 2KCl
(c) NiCO3 NiO + CO2
(d) Cl2 + 2NaBr 2NaCl + Br2

Answers

Answer: The correct answer is Option b.

Explanation:

Double displacement reactions are defined as the reactions in which exchange of ions takes place.

$AB+CD\rightarrow CB+AD$

For the given options:

Option a: $3Fe+2O_2\rightarrow Fe_3O_4$

This is an example of synthesis reaction.

Option b: $BaCl_2+K_2CO_3\rightarrow BaCO_3+2KCl$

This is an example of double displacement reaction.

Option c: $NiCO_3\rightarrow NiO+CO_2$

This is an example of decomposition reaction.

Option d: $Cl_2+2NaBr\rightarrow 2NaCl+Br_2$

This is an example of single displacement reaction.

From the above information, the correct answer is Option b.

b) is an example of a Double Displacement Reaction:

Ba Cl2 + K2 CO3 ---> Ba CO3 + 2K Cl
A B C D A D B C

A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock’s gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec., at the bottom of the cliff the rock’s potential energy is completely converted to kinetic energy. Use the formula for kinetic energy to calculate the rock’s speed at the bottom of the cliff. Show all calculations.

Answers

Lets see:-

We have our formula for potential energy, which we are trying to solve for,

PE = mgh or potential energy = mass * gravity * height

So we know that PE all depends on these.

Height : 30 meters
Mass : 25 kg
Gravity (which is always constant) : 9.8 m/s/s

Now add into formula.

PE = 25*30*9.8
PE = 7350 Joules

Answer: PE = 7350 Joules

Now calculate speed:-

7,350 joules/12.5 kg = speed-squared
588 m²/s² = speed-squared
about 24.248 m/s

It is true/falseit that when hydrogen cyanide, h c n , dissolves in water, the solution is weakly conducting and acidic in nature. This is because hydrogen cyanide, h c n is a blank that blank support the movement of charge. In addition, since specifically blank formed, the solution is blank.It is blank that when acetone, CH3COCH3, is dissolved in water conducting solution results. This is because acetone, CH3COCH3 is a blank that blank support the movement of charge

The words are:
True, false, weak electrolyte, strong electrolyte, non-electrolyte, does not, does, H+ is, OH- is, no ions are, acidic, basic, neutral.

Answers

Final answer:

HCN is a weak electrolyte that partially ionizes in water and forms an acidic solution as H+ ions are formed, while acetone is a non-electrolyte that does not form ions in water and the resulting solution is neutral.

Explanation:

It is true that when hydrogen cyanide, HCN, dissolves in water, the solution is weakly conducting and acidic in nature. This is because hydrogen cyanide, HCN, is a weak electrolyte that only partially ionizes in water, and hence does support the movement of charge, albeit to a lesser extent than a strong electrolyte. In addition, since H+ ions are specifically formed from the ionization of HCN in water, the solution is acidic.

It is false that when acetone, CH3COCH3, is dissolved in water a conducting solution results. This is because acetone, CH3COCH3, is a non-electrolyte. It does not ionize in water, and therefore does not support the movement of charge. As such, no ions are formed when acetone is dissolved in water and the solution remains neutral.

Learn more about Chemical Solutions here:

brainly.com/question/28945073

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Who has taken chemistry, if you have I want to know how were you successful (if u were) because currently I am taking it and I’m failing? So any suggestions that could help me pass

Answers

My number one tip is to STUDY! I know it sucks, but once you're in high school, it's going to become a part of your routine every single day. Even if you study right now, keep on doing it over and over and over. Trust me! It'll help. Also, get a tutor! Maybe someone you know is doing well and you could ask them to help, or you could ask a student who was in your class and passed. My number one advice is to just keep working hard. I get it; chemistry is HARD. You'll get there!

do what they said, also learn how to take cornell notes, when done correctly hey can be life saving! there is a video on youtube on how to correctly take them and use it to their full potential

Fill in the blanks with the words in the following list. apron
doing
MSDS
drink
eat
mix
goggles
safety shower
water
acids

Rule number one in laboratory safety is know what you are
doing
.

The best protections from chemical splashes and spills are an ________
to cover your body and _________
for your eyes.

Never
eat
food or
drink
liquids from a lab container, even if it has been thoroughly washed.
Rinse skin thoroughly with
water
after a chemical splash.

A _________
should be used for more significant spills.

Pour
acids
into water, never the other way around.
Do not
mix
chemicals unless you know what the product of the reaction will be.

A _________
describes important safety and reactivity information about a chemical.

Fill in the blanks please

Answers

aprons are used to cover your body (most people use la coats though) and goggles are used to cover your eyes.

A Safety shower should be used for more significant spills.

An MSDS (Material Safety Data Sheet) describes important safety and reactivity information about a chemical.

I hope this helps. Let me know in the comments if anything is unclear.

A race car travels on a circular track at an average rate of 125 mi/h. The radius of the track is 0.320 miles. What is the centripetal acceleration of the car?

Answers

Answer;

= 48,828.125 mi/hr²

Explanation and solution;

Centripetal acceleration is the rate of change of angular velocity. Centripetal acceleration occurs towards the center of the circular path along the radius of the circular path.

Centripetal acceleration is given by; V²/r ;

V = 125 mi/h and r = 0.320 miles

Thus; centripetal acceleration = 125²/0.320

=15625/0.320

= 48,828.125 mi/hr²

The centripetal acceleration is obtained from the quotient of the square of velocity and the radius. Hence, a= $( v^(2) )/(r)$ . Substituting the give, v=125 mi/h and r=0.320 mi, the answer is equal to 48,828.125 mi/ $hr^(2)$ .