CHEMISTRY HIGH SCHOOL

Rutherford’s gold foil experiment gave evidence that an atom is mostly empty space. true false

Answers

Answer 1
Answer:

The given statement is true .

What is Rutherford’s gold foil  experiment?

  • A piece of gold foil was hit with alpha particles, which have a favorable charge. Most alpha particles went right around. This showed that the gold particles were mostly space.
  • The Rutherford gold leaf investigation supposed that most (99%) of all the mass of an atom is in the middle of the atom, that the nucleus is very small (105 times small than the length of the atom) and that is positively captured.
  • For the distribution experiment, Rutherford enjoyed a metal sheet that could be as thin as practicable. Gold is the most malleable of all known metals. It can easily be converted into very thin sheets. Hence, Rutherford established a gold foil for his alpha-ray scattering experimentation.

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Count the total number of atoms in sio2:

Answers

Atoms are the basic units of matter and the defining structure of elements. We count the number of atoms by the total number of elements present in the compound. In this case, we have 1 atom of Si and 2 atoms of oxygen which would have 3 total number of atoms.

What are four things that a chemical change probably happened

Answers

Four signs that indicate a chemical change are as follows: 1) Change in color 2) Change in smell 3) Change in texture 4) Change in temprature

if a chemist wants to make 1.3L of 0.25M solution of KOH by diluting a stock solution of 0.675 M KOH, how many milliliters of the stock solution would the chemist need to use?

Answers

To solve this we use the equation,

 

M1V1 = M2V2

 

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

 

.675 M x V1 = .25 M x 1.3 L

V1 = 0.48 L or 480 mL

If a chemist wants to make 1.3 L of 0.25 M solution of KOH by diluting a stock solution of 0.675 M KOH, the chemist would need to use 480 mL of the stock solution.

Is melting ice an endothermic or exothermic? its a big class discussion in chemistry and the teacher won't tell us until the whole class agrees

Answers

It is an Endothermic because the ice cube is absorbing the heat making the ice cube melt. It can not be Endothermic because it is not releasing any heat it is melting.

in a collosion 15 kg object moving with a velocity of 3 m.s transfers all of its momentum to a 5 kg object. what would be the velocity of the 5 kg object after the collosion

Answers

P=mv
1st object- 45kg*m/s
45=5v
V=9m/s
The velocity if the second object is 9 meters per second

Beth’s hygrometer is reading a temperature of 30°C and a relative humidity of 65%. The humidity in the air is how many grams/cubic meter.

Answers

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, humidity in  grams/cubic meter is 19.5.

What is matter?

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.

humidity =30 × 65% =19.5 grams/cubic meter

Therefore, humidity in  grams/cubic meter is 19.5.

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Answer:19.5 grams/cubic meter

Explanation:30 times 65% search it it equals 19.5
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