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
hichkok12 [17]
3 years ago
11

Which statement about atoms and molecules is

Chemistry
2 answers:
Pavel [41]3 years ago
8 0

Elements always exist as pair of atoms called molecules .

Explanation:-

  • The material which has only one types of similar atoms called element .
  • Ex:-Sodium,Carbon etc
zhuklara [117]3 years ago
3 0

Answer:

Elements always exists as pairs of atoms called molecules

Explanation:

  • Elements are simply substances in its pure form.
  • The atom of an element is simply referring to a single element. eg we have sodium atom as Na, it appears singly and in its pure form
  • A molecule then refers to when an atom of the same element is paired up. i.e not in a single state. eg, we have one atom of hydrogen molecule as H2, Oxygen molecule as O2.
  • Note. the molecular elements appear in pairs while the atomic elements appear singly.

You might be interested in
Ammonia can be produced in the laboratory by heating ammonium chloride
AnnyKZ [126]

Answer:

Mass = 2.89 g

Explanation:

Given data:

Mass of NH₄Cl = 8.939 g

Mass of Ca(OH)₂ = 7.48 g

Mass of ammonia produced = ?

Solution:

2NH₄Cl   +  Ca(OH)₂     →    CaCl₂ + 2NH₃ + 2H₂O

Number of moles of NH₄Cl:

Number of moles = mass/molar mass

Number of moles = 8.939 g / 53.5 g/mol

Number of moles = 0.17 mol

Number of moles of Ca(OH)₂ :

Number of moles = mass/molar mass

Number of moles = 7.48 g / 74.1 g/mol

Number of moles = 0.10 mol

Now we will compare the moles of ammonia with both reactant.

                      NH₄Cl          :          NH₃

                          2              :           2

                         0.17          :          0.17

                   Ca(OH)₂         :          NH₃

                        1                :           2

                    0.10              :          2/1×0.10 = 0.2 mol

Less number of moles of ammonia are produced by ammonium chloride it will act as limiting reactant.

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 0.17 mol × 17 g/mol

Mass = 2.89 g

6 0
3 years ago
The amount of space tgat matter occupies is referred to as...
Marrrta [24]
It is either mass or volume
4 0
3 years ago
Read 2 more answers
Balance the nuclear reaction equation for the beta minus decay of nickel-63 by completing the missing numbers.
Marta_Voda [28]

Answer: 63 & 29

Explanation:

7 0
3 years ago
The radioactive isotope I-131 is used in
Fudgin [204]
The answer is D, medical diagnosis
3 0
3 years ago
Molecule A is: A. Isocitrate B. Pyruvate C. Alpha-ketoglutarate D. Oxaloacete E. None of the above
hodyreva [135]

Answer:... I'm sorry.. I think you're missing something

Explanation:

3 0
3 years ago
Other questions:
  • When particles are added volume will
    12·2 answers
  • Arrange the following types of photons of electromagnetic radiation in order of decreasing energy: red light, radio, x-rays, γ-r
    11·1 answer
  • Sentence for death rate
    10·1 answer
  • What is the more reactive metal CA or Ra
    14·2 answers
  • Can you help.me this above question. ..​
    14·1 answer
  • Perform the following conversions:
    14·1 answer
  • How can plants cause weathering?
    15·2 answers
  • Which is the most likely to be reduced
    6·2 answers
  • Helllllp me please <br> Part D ends with neon Express your answer as an integer. 20
    14·1 answer
  • What would be the mass of a 33.5dm3 sample of O2 at STP?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!