CHEMISTRY HIGH SCHOOL

Which is a pure substance?
soda
gasoline
salt water
carbon dioxide

Answers

Answer 1
Answer:

Answer: Carbon dioxide is a pure substance.

Explanation: A pure substance is defined when a substance has a single type of molecule. If more than 1 type of molecule is present in a substance, then it is considered as a mixture.

  • Soda is basically a mixture of water and carbon dioxide. More than 1 type of molecule is present.
  • Gasoline is a mixture of may gases. More than 1 type of molecule is present.
  • Salt water contains salt and water molecules, hence it is considered as a mixture.
  • Carbon dioxide has only 1 type of molecule which is CO_2 molecules. Hence, it is a pure substance.
Answer 2
Answer:

Answer:

Carbon dioxide

Explanation:

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What is igneous rock?

Answers

Answer:  A) Rock formed by...magma or lava

Explanation:

As the question says, igneous rocks are formed from the cooling and solidification of magma or lava.

just a bit of visual aid thanks to Thoughtco.

Answer:

It is the first one - Rock formed by the cooling and solidification of hot liquid magma or lava.

Explanation:

classify these compounds by whether they behave as strong acids, weak acids, strong bases, or weak bases in aqueous solution.

Answers

For number one, the reaction is the neutralization of a strong acid and a strong base to yield a salt and water. The strong acid is the HCl and the strong base is NaOH. The salt is NaCl.

 

For number two, the equation is balanced. Na in the reactant side has one atom and also in the product side. O has only one atom in the product and in the reactant. There are 2H’s in the reactant and in the product side (present in H2O, the 2 in H stands for 2 atoms of H). One atom of Cl is present in the reactant and product side.

 

For number three, the reactants are NaOH-sodium hydroxide and HCl-hydrogen chloride(hydrochloric acid). The products are NaCl-sodium chloride and H2O-water.

What does the empirical formula of a compound describe?

Answers

it is what form where all coeficients are made into the smallest whole numbers

example

2C+4HC=8HC could be simplified to
C+2HC=4HC (note: formula is not a liegit one, only for example)

Calculate the number of moles 3.15 g of HNO3 19.3 g of NaCl 21.25 g of NaNO3

Answers

The number of moles:
3.15g of HNO_(3)
1 mole of HNO_(3)- 63g.
x moles of HNO_(3)- 3.15g
x=(1\ mole*3.15g)/(63g)=(3.15)/(63)=0.05\ mole

The number of moles:
19.3 g of NaCl
1 mole of NaCl- 58.44g.
x moles of NaCl- 19.3g.
x=(1\ mole*19.3g)/(58.44g)=(19.3)/(58.44)=0.33\ mole

The number of moles:
21.25 g of NaNO_(3)
1 mole of NaNO_(3)- 85g.
x moles of NaNO_(3)- 21.25g.
x=(1\ mole*21.25g)/(85g)=(21.25)/(85)=0.25\ mole

Greetings, 
n00nst00p :)

How many atoms are in 0.750 moles of zinc?

Answers

There are approximately 4.52 x 10^23 atoms in 0.750 moles of zinc.

How to find the number of atoms

To determine the number of atoms in a given amount of a substance, you can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.

Given that you have 0.750 moles of zinc, you can calculate the number of atoms using the following steps:

Multiply the given number of moles by Avogadro's number:

0.750 moles * (6.022 x 10^23 atoms/mol) = 4.5165 x 10^23 atoms

Round the result to an appropriate number of significant figures:

Since the value given has three significant figures, the final answer should be rounded accordingly. Therefore, the number of atoms in 0.750 moles of zinc is approximately 4.52 x 10^23 atoms.

So, there are approximately 4.52 x 10^23 atoms in 0.750 moles of zinc.

Learn more about zinc at

brainly.com/question/1594082

#SPJ6
(doesn't really matter that it's zinc :) )
It is 0.75*N_A, where N_A=6.023*10^(23) (in some books 6.022).

The heart is protected from the bones by the .

Answers

The heart is protected from the bones by the rib cage or the thoracic cage. It protects both the heart and the lungs. The rib cage is composed of 12 pair of ribs, the sternum and thoracic vertebrae. All ribs are connected to the thoracic vertebrae. The rib cage also do not only protect the heart and lungs but also support the body and aid in respiratory function.
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