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
DochEvi [55]
3 years ago
11

People have developed models of the universe for thousands of years. Identify two observations that a model of the universe woul

d need to explain in order to be useful
Chemistry
1 answer:
ella [17]3 years ago
4 0
It It would both need to show and explaine the universe
You might be interested in
Which of the following are isotopes, choose all that apply.
Juliette [100K]

Answer:

Element X with atomic number 10 and atomic mass 21

Element Z with atomic number 10 and atomic mass 22

Explanation:

Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.

  • Isotopes of an element have the same electronic configuration.
  • They share the same chemical properties
  • They only differ in their masses.

So, Element X and Z with atomic number 10 which is their number of electrons are isotopes. Their mass number, 21 and 22 differs.

4 0
3 years ago
Helpppppppppppppp!!!!!!!
OlgaM077 [116]
Something on a man i think it’s crocs
3 0
3 years ago
Two samples of sodium chloride with different masses were decomposed into their constituent elements. One sample produced 1.731.
Amanda [17]

Answer:

The answer to your question is letter c) 6.09 g of sodium and 9.38 g of chlorine.

Explanation:

This problem is solve using rule of three

We know that the proportion Sodium to Chloride is 1 to 1 in sodium chloride, so we have to look for this proportion in the options

AM Sodium = 23 g

AM Chlorine = 35.5 g

                 Sodium                                     Chlorine

           23 g ---------------- 1 mol              35.5 g -------------- 1 mol

       1713.73g -------------    x               2666.6 g -------------    x

          x = 1713.73/23 = 74.51                     x = 2666.6/35.5 = 75.12

    These values are very similar, we have to look for the proportion in the options

a)      6.09g of sodium = 0.26 mol

      4,87 g of chlorine = 0.14 mol           These numbers are not very similar

b) We have 0.26 mol of Na

                  0.037 mol of Cl                      This is not the answer

c) We have 0.26 mol of Na

                  0.26 mol of Cl                     These numbers are the same, the proportion is 1:1, this is the answer

d) We have 0.26 mol of Na

                   0.36 mol of Cl                    This is not the answer

8 0
3 years ago
The mass number of an element is equal to
klasskru [66]

Answer:

The mass number is defined as the total number of protons and neutrons in an atom.

Explanation:

8 0
3 years ago
G An example of an element is ____.
Contact [7]
Pipes are made of the element Lead so the answer should be d) lead pipe



4 0
3 years ago
Other questions:
  • What are  human made of
    5·2 answers
  • What are insulated foam cups most likely made out of? polyethylene polystyrene nylon thread vulcanized rubber
    5·2 answers
  • Tentukan pH Mg(OH)2 jika ke dalam larutan MgCl2 0,2M ditambahkan NH4OH sehingga
    9·1 answer
  • The approximate concentration of the NaOH solution you will prepare in Part A of this experiment is 0.12M. Calculate the number
    14·2 answers
  • How does heat flow? Use the following keywords: heat, thermal energy, transfer, same, hot to cold, kinetic energy
    6·1 answer
  • What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)?
    12·2 answers
  • Describe the motion of molecules in an ice cube<br> and in a radiator in winter
    9·1 answer
  • Balance the chemical equation given below, and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is
    5·1 answer
  • Name three organelles and explain the function of each.
    10·1 answer
  • The uneven heating of the atmosphere by the sun's energy creates pressure
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!