CHEMISTRY MIDDLE SCHOOL

Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms?A.His results gave people a picture of what atoms look like for the first time.
B.His results gave the first clues that atoms could be created and destroyed.
C.His results gave the first experimental evidence that matter is made up of atoms.
D.His results gave the first evidence that atoms were made up of smaller particles.

Answers

Answer 1
Answer:

Answer:

D, because he discovered electrons

Explanation:
Answer 2
Answer:

His results gave the first evidence that atoms were made up of smaller particles.

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If molarity = moles liter , then how many grams of NaCl are needed to make 1 liter of a 0.1 M solution? A) 0.0584 g NaCl B) 3.246 g NaCl C) 5.844 g NaCl D) 58.44 g NaCl

Answers

 The grams  of NaCl   that needed  to make 1L  of a 0.1 M solution  is  

5.845 g (answer C)

 calculation

Step 1: find the  moles of NaCl

moles  = molarity  x  volume  in liters

molarity = 0.1 M =0.1 mol/l

= 1 L x 0.1 Mol/L = 0.1 moles


Step 2: find  the   mass  NaCl

mass =  moles x  molar mass

From  periodic  table   the molar mass of NaCl  = 23 +35.45 =58.45 g/mol

mass= 0.1 moles  x 58.45 g/mol =5.845 g appropriate ( answer C)


Answer : Option C) 5.844 g NaCl

Explanation :

To calculate the number of grams of NaCl that would be needed to make 0.1 M of solution we have to calculate;

  1. The molecular weight of sodium chloride (NaCl) which is 58.44 g, so one gram molecular weight will be= 1 mole which is 58.44 g.
  2. By dissolving 58.44 g of NaCl upto the final volume of 1 litre, one can get 1 M NaCl solution.
  3. So, to make 0.1 M NaCl solution we have to dilute the mass of salt to 1000 ml of solution as follows;
  4. 0.1 M NaCl solution will require 0.1 x 58.44 g of NaCl = 5.844 g. of NaCl.

Why do the particles of objects have both kinetic and potential energy?  

Answers

The particles of objects have both kinetic and potential energy because these forces are drive by the force of motion or stillness of an object. Potential energy is the a type of energy which an object possess however without motion. Kinetic energy in the other hand, is the energy in motion or if the object moves along from one space to another with respect to time. They both have these two energies by the presence of atoms in these entities.



Fossil fuels are running out. Solar and wind technologies are location specific and don't produce enough power to entirely replace fossil fuels. These are reasons to focus on which of the following? A)Nuclear Power B)Green Energy C)Coal and Natural Gas D)Increasing the oil supply

Answers

Fossil fuels are made from the decomposition of plants and animals. These fuels are present in the earth's crust and contain carbon and hydrogen which is usually burned to obtain energy. Nuclear Power comes now in the place of fossil fuels. The correct option is A.

What is nuclear power?

The use of nuclear reactions to generate the electricity is defined as the nuclear power. The nuclear fission, nuclear fusion and nuclear decay results in the formation of nuclear power. Now a days majority of the electricity from nuclear power plants is produced by the fission of uranium and plutonium.

The nuclear power plants heat water to produce steam. The steam is used to rotate large turbines which generate electricity. They use heat produced during nuclear fission to heat water. The nuclear power is the clean and efficient way of boiling water to form steam.

Thus the correct option is A.

To know more about Nuclear Power, visit;

brainly.com/question/18769119

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Answer:

Nuclear Power

Explanation:

What is the difference between foliated and non-foliated metamorphic rocks

Answers

foliated metamorphic rocks such as gneiss,phyllite,schist and slate have a layered or banded appear once that is produced by exposure to heat it is intermediate in grade between slate and schist

Is rock solution because it is made up of minerals, water, stone, and dirt?

Answers

Rocks are made up deposited minerals that form and condense into rocks
yes its made of minerals water stone and dirt

Help me!!! Several small craters lie in the floor and on the walls of crater 2. Which is older,crater 2 or the smaller craters inside it?

Answers

Well, think of it this way. If you put a big paper circle on the ground, and then you put smaller circles on top of the big circle, which one would have been there longer? The big circle, of course. So the same logic applies here: if the smaller craters had been older than the big crater, then when the big crater was formed, the smaller ones would've been buried. Therefore, crater 2 is older than the smaller craters inside it.
Hope that helped! =)
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