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
Rudiy27
2 years ago
14

Describe two observations you might make when a chemical change occurs

Chemistry
1 answer:
Sav [38]2 years ago
7 0
The first one is color change
Second is the precipitate present
You might be interested in
If a substance undergoes electrolysis and a brown solid forms on one electrode and a gas on the other, from this we can conclude
andrew-mc [135]

Answer:

b. a compound.

Explanation:

Electrolysis is described as a mechanism in which ionic compounds are decomposed into their elements by transmitting a direct electric current via the compound in a liquid state. At the cathode, the cations are reduced and anions at the anode are oxidized. There is an exchange between ions and atoms in the electrolysis process caused by the addition or removal between electrons from the external circuit. As per the question, the original substance is a compound because the electrolysis method is used to obtain pure elements from their respective compound.

7 0
3 years ago
What is the correct equilibrium constant
Elza [17]

Answer:[co2][CF4]

[COF2]^2

Explanation:

4 0
3 years ago
Read 2 more answers
Explain why boats can float when they are made out of material that is more dense than water? Your answer must include informati
cluponka [151]
I need help to cause it asked me that questions
5 0
2 years ago
A sample of nitrogen gas has a mass of 48.6 grams. How many N2 molecules are there in the sample? molecules Submit Answer &
marysya [2.9K]

Answer:

There are 1.05  x 10²⁴ molecules in 48.6 g N₂

Explanation:

1 mol of N₂ has a mass of (14 g * 2) 28 g.

Then, 48.6 g of N₂ will be equal to (48.6 g *(1 mol/ 28 g)) 1.74 mol.

Since there are 6.022 x 10²³ molecules in 1 mol N₂, there will be

(1.74 mol *( 6.022 x 10²³ / 1 mol)) 1.05  x 10²⁴ molecules in 1.74 mol N₂ (or 48. 6 g N₂).

6 0
3 years ago
1. Which of the following is a combination reaction?
DaniilM [7]

Answer:

The answer to your question is: letter A

Explanation:

A combination reaction is when there are two reactants that gives only one product.

a. 2SO2 + O2—> 2SO3                          This is a combination reaction,

                                                               2 reactants gives one product.

b. Zn + Cu(NO3)2–>Zn(NO3)2 + Cu     This is not a combination reaction,

                                                                it's a single replacement reaction.

c. 2H2O2–> 2H2O+O2                          This is a decomposition reaction

d. AgNO3 + NaCl → AgCl+NaNO3        THis is a double replacement reaction.

8 0
3 years ago
Other questions:
  • What is the Electronegativity difference of F and CI
    7·1 answer
  • at room temperature table salt is a solid and mercury is a liquid. what conclusion can you draw about the melting points of thes
    12·1 answer
  • How does water vapor become liquid water
    7·2 answers
  • Air is composed of 79%N^2, 21% O^2. if the air pressure is 101.3 kPa, what are the pressures of N^2 and O^2
    6·1 answer
  • Which of the following would have the highest buffer capacity?
    10·1 answer
  • For carbon monoxide poisoning, the treatment is administration of oxygen at high pressure. This increases the amount of oxyhemog
    7·2 answers
  • Which sample is a pure substance?
    13·2 answers
  • LOS GASES NOBLES TAMBIÉN SE COMBINAN<br><br> EN EL ESPACIO
    5·1 answer
  • Using the VSEPR theory , what would the representation mean A central atom with 2 connected atoms atom with I lone pair of Jone
    5·1 answer
  • Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!