CHEMISTRY MIDDLE SCHOOL

What were the names of the minerals and types of rocks?

Answers

Answer 1
Answer: Types of rocks: Igneous, sedimentary, and metamorphic
There are over 200 names of minerals, I'm not sure what you want for that
Answer 2
Answer: igneous rocks metamorphic rocks and sedimentary rocks

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Why can water dissolve many ionic compounds

Answers

To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond. Water is a polar molecule. It has a permanent dipole. ... The negative ions have several water molecules around them, all with their H atoms close to the negative ion

Credits
Socratic

2. A solution in which 50 grams of salute is dissolved in 250 grams of solution has a concentration of

Answers

The fact that the unit is supposed to be in percent makes me think it is referring to percent mass.  To find percent mass you need to find find the divide the mass of solute by the total mass of solution and than multiply that by 100%.
%mass=(50g/300g)x100%
%mass=0.167%

I hope this helps.

Which of the following statements does not describe a physical property of a piece of chalkA. Chalk is solid
B.chalk can be broken into pieces 
C. Chalk is white
D. Chalk will bubble in vinegar

Answers

D.) Chalk will bubble in vinegar.
This is a chemical property, not a physical property.

In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction?

Answers

The answer is that, the reactants lose energy to the sorrounding during the reaction. This makes the products have less energy than the reactants that combined to produce them.

Answer:

The correct answer is B

Explanation:

Who was J.J. Thomson

Answers

Sir Joseph John Thomson OM PRS was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered.
Sir Joseph John Thomson OM PRS was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered.

Which explanation best compares the movement of particles in the three states of matter

Answers

Particles in a solid state can only vibrate. In a liquid state, they slide against each other. And in a gas state, they move freely, bouncing and bumping into each other.

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