Could volume by displacement be used to determine the volume of a lump of rock salt? Explain would be nice
Answers
Yes it could, but you'd have to set up the process very carefully.
I see two major challenges right away:
1). Displacement of water would not be a wise method, since rock salt
is soluble (dissolves) in water. So as soon as you start lowering it into
your graduated cylinder full of water, its volume would immediately start
to decrease. If you lowered it slowly enough, you might even measure
a volume close to zero, and when you pulled the string back out of the
water, there might be nothing left on the end of it.
So you would have to choose some other fluid besides water ... one in
which rock salt doesn't dissolve. I don't know right now what that could
be. You'd have to shop around and find one.
2). Whatever fluid you did choose, it would also have to be less dense
than rock salt. If it's more dense, then the rock salt just floats in it, and
never goes all the way under. If that happens, then you have a tough
time measuring the total volume of the lump.
So the displacement method could perhaps be used, in principle, but
it would not be easy.
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(2) the iron loses its metallic properties
(3) the sulfur gains magnetic properties
(4) the sulfur gains metallic properties
Answers
The mixture of iron sulfide formed is non-magnetic wherein iron looses its magnetic properties.
How do properties of compound differ from elements?
The properties of compound are different from those of the elements from which it is formed. The reason to this is when elements combine to form compounds ,the properties of elements are completely changed and have completely new set of properties.
When iron which has magnetic properties forms a mixture with sulfur iron sulfide is formed,which is non-magnetic.Here, the iron looses it's magnetic properties as it forms compounds with sulfur.
On combining with sulfur, compound formed is iron sulfide with no magnetic properties .Thus on moving the magnet over this mixture does not attract any iron particle towards it as the properties are completely altered when compounds are formed.
Learn more about properties of compounds ,here:
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I need to pass this tomorrow
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Answer: option 1. different molecular structures and different properties.
Explanation:
1) O₂ and O₃ are different forms of the same element, in the same physical state (gaseous).
2) That is what is called allotropes.
3) The definition of allotropes is different forms of an element with different structures and different properties in the same physical state.
Graphite and diamond is other example of common allotropes.
4) O₃ and O₂ have the same kind of atoms (oxygen), but they are bonded differently (different structure, one molecule has 3 atoms, other 2 atoms) which conferes them different properties (e.g. different odor, different chemical reactivity).
2)38.5 g
3)200 g
4)617 g
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200 g is the mass of would be used. Hence, option C is correct.
Define the molarity of a solution.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Total volume = 10 x 0.250 liters = 2.5 liters
M = n ÷ V
Total moles: n = M x V
= 0.720mol/liter x 2.5 liter
=1.8 mol
Molar mass = grams / n
1.8 mol x 110.98 g/mol
= 199.8 grams
Hence, option C is correct.
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M = n / V (liters)
Total moles: n = M*V = 0.720mol/liter *2.5 liter =1.8 mol
MM = grams / n --> grams = n*MM = 1.8 mol * 110.98 g/mol = 199.8 grams
Answer: option 3) 200 g.
B. the temperature
C. the concentration of reactants
D. all of the above
Answers
The following that affects the rate of a chemical reaction is the presence of catalyst, temperature, and concentration of reactant. The correct option is D.
What is the rate of a reaction?
The rate of reaction is the speed of the reaction at which a reaction takes place.
The catalyst increases the rate of reaction.
The increase in temperature increases the rate of reaction.
Thus, the correct option is D. all of the above.
Learn more about the rate of a reaction
increase in concentration increases the molecules reacting so the reaction is faster and vice versa.