CHEMISTRY HIGH SCHOOL

Which statements describe elements?- Elements can be separated using physical means.
- Elements are made of atoms with the same atomic number.
- Elements cannot be separated using ordinary chemical means.
- Elements may be represented by chemical symbols.
- Elements are made of two or more different types of atoms.

Answers

Answer 1
Answer:

Answer:

give dat hooman a brainliest!!

Explanation:
Answer 2
Answer:

Answer:

B C and D

Explanation:

Omg

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Compared to a 26-gram sample of NaCl(s) at STP, a 52-gram sample of NaCl(s) at STP has(1) a different density(2) a different gram-formula mass(3) the same chemical properties(4) the same volume
Determine the number of atoms in 4.56x10-2g Na

Plz I need help is the 2nd time I post this

Answers

Answer:

2--->C

6---->E

3---->D

4--->A

5--->B

1---->F

Explanation:

I think so, sorry if its wrong.

In what way are all sound waves and light waves similar?

Answers

Hello.In a homogeneous environment, the distribution of the light waves and sound waves is rectilinear and uniform (in constant speed).
So sound waves, and light waves. Well they are both waves, they can be reflected/refracted.

The molarity of an aqueous solution of NaCl is defined as the(1) grams of NaCl per liter of water
(2) grams of NaCl per liter of solution
(3) moles of NaCl per liter of water
(4) moles of NaCl per liter of solution

Answers

Answer:

The correct option is (4)

Explanation:

Molarity (M) is generally defined as the number of moles of a solute per liter of the solution.

The formula for molarity (from the definition above) is

M = number of moles (n) ÷ volume (in liters or dm³)

The unit for molarity is mol/L or mol/dm³

From the above, it can be deduced that the molarity of an aqueous solution of common salt (NaCl) is the number of moles of NaCl per liter of the salt solution.
Molarity = number of moles / volume in liters solution

Answer (4)

hope this helps!

How many grams of oxygen can be created when you heat 200g of sodium chlorate

Answers

The balanced chemical reaction is:

2NaClO3 9= 2NaCl + 3O2
We are given the amount of sodium chlorate to heat. This will be the starting point of our calculations.

200 g NaClO3 (1 mol / 106.44 g) ( 3 mol O2 / 2 mol NaClO3) (32 g O2 / 1 mol O2) = 90.19 g O2

If it takes 65.3 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1?

Answers

65.3 / 20

equals 3.265

Which statement describes the composition of potassium chlorate, KClO3?(1) The proportion by mass of elements combined in potassium chlorate is fixed.
(2) The proportion by mass of elements combined in potassium chlorate varies.
(3) Potassium chlorate is composed of four elements.
(4) Potassium chlorate is composed of five elements.

Answers

Answer : The correct option is, (1) The proportion by mass of elements combined in potassium chlorate is fixed.

Explanation :

The composition of any compound is studied on the basis of law of fixed proportion. This law stats that in a compound the elements are present in fixed proportion by their mass.

In the given options, the option (1) statement describes the composition of potassium chlorate.

While the other options (2), (3) and (4) statements does not describe the composition of potassium chlorate.

Hence, the correct option is (1).
The statement that best describes the composition of potassium chlorate, KCIO3 is " The proportion by mass of elements combined in potassium chlorate is fixed."
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