1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vlabodo [156]
3 years ago
13

These substances are all ____. H2O2 Li NaCl O2

Chemistry
1 answer:
Bogdan [553]3 years ago
7 0

Answer: pure substances.


Explanation:


The given substances are:

  • H₂O₂
  • Li
  • NaCl
  • O₂

All what surrounds us, which has mass and occupies spaces, is matter. There are two kind of matter: pure substances and mixtures.


Pure substances have a uniform and constant composition. On the other hand, mixtures are combinations of two or more pure substances in  any arbitratry ratio.


Pure substances may be elements or compounds. The elements are the substances conmposed by one only kind of atom. In the list of substances given, Li and O₂ are elements: all the atoms in Li are lithium, and all the atoms in O₂ are oxygen atoms.


Compounds are the chemical combination of two or more different kind of atoms. In the given list H₂O₂ and NaCl are compounds. As you see, H₂O₂ contains atoms of hydrogen and oxygen, chemically bonded, in a fixed ratio (2 atoms of hydrogen by 2 atoms of oxygen). And NaCl has atoms of Na (sodium) and Cl (chlorine), chemicaly bonded, in a fixed ratio (1:1).


There are only 118 known elements and you can find them in any modern periodic table. Therer are virtually infinitely many compounds since many different combinations of the elements can be attained.


Elements and compounds have in common that they are classified as pure substances.


You might be interested in
What is the molar mass of magnesium chlorite (Mg(CIO2)2)?
sveticcg [70]
Hope this helps! 159.2086<span>Have a Good Day!</span>
4 0
3 years ago
20 ml each of oxygen and methane are allowed to react when the reaction is completed.  The system now contains
Mekhanik [1.2K]

Answer:

CH4(g)+2O2(g)→CO2(g)+2H2O(l).

5 0
3 years ago
Some fruits and vegetables are preserved by pickling them. Nandini got confused
stepan [7]

Answer:

ye

Explanation:

ye

3 0
3 years ago
Calculate the percent by volume of a solution that has 75 mL of solute dissolved in 375 mL of solution. Show your work and round
Mandarinka [93]

Answer:

The answer is 20 % V/V

Explanation:

We use this formula for calculate the %V/V:

%V/V= (ml solute/ml solution) x 100= (75ml/375 ml)x 100 = 20 % V/V

<em>The% V / V represents the amount of ml of solute dissolved in 100 ml of solution</em>

7 0
3 years ago
Which statement is true of a reversible reaction at equilibrium?
Vedmedyk [2.9K]

Answer:

D.

The concentration of reactants and the concentration of products are constant.

Explanation:

pls mark as brainliest

7 0
3 years ago
Read 2 more answers
Other questions:
  • Plaster casts, CaSO4 Spell out the full name of the elements in alphabetical order separated by commas.
    10·2 answers
  • In the image above, the girl is using her arm to lift a weight. Her arm is acting as a _______.
    6·1 answer
  • How many moles are equal to 83.4 L of O2?
    8·1 answer
  • Which compound has the bigger lattice energy? K Br CaBr2 o O Na, NaF Rb20 0 Rb, S 0
    7·1 answer
  • Part i. you considered the equilibrium: fe3+(aq) + scn-(aq) fe(scn)2+(aq), and compared the color of the solutions in four test
    6·1 answer
  • Which of the statements regarding the nitrogen cycle is true? choose 1 answer: choose 1 answer: a animals obtain nitrogen throug
    5·2 answers
  • rank the following elements in order of increasing atomic size sodium, hydrogen, carbon and beryllium
    13·1 answer
  • Which event was responsible for supplying the early earth with water
    5·1 answer
  • PLEASE HELP ASAP!!!!!!!!
    13·1 answer
  • Identify the element that cannot participate in nuclear fission reactions.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!