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
GenaCL600 [577]
3 years ago
7

Why are chemical changes considered "unseen?"

Chemistry
2 answers:
hichkok12 [17]3 years ago
6 0
<span>Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing. This is in comparison to a physical change, which is visible.</span>
Andrej [43]3 years ago
5 0
Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing.
You might be interested in
What happens when a salt reacts with base?
harkovskaia [24]

Answer:

When an acid and a base are placed together, they react to neautralise the acid and base properties, thus making a salt.

Explanation:

The compound formed by the caption of the base and the anion of the acid is called a salt.

4 0
3 years ago
Read 2 more answers
How do I create an atom with a mass of 3 and a neutral charge?
kupik [55]

Answer:

a lithium atom (Z=3, A=7 AMU) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7 – 3 = 4).

Explanation:

6 0
2 years ago
What is the ph category of each of the following i need help plz
shepuryov [24]

1. base

2. neutral

3. acid

4. base

If this is what you meant, hope it helps

4 0
3 years ago
Calculate the concentration 3.8g of copper sulfate, CuSO4 dissolved in 250cm4 of water
11Alexandr11 [23.1K]

Answer:

Molarity = 0.08 M

Explanation:

Given data:

Mass of copper sulfate = 3.8 g

Volume of water = 250 cm³  (250/1000 = 0.25 L)

Concentration of solution = ?

Solution:

Number of moles of copper sulfate:

Number of moles = mass/molar mass

Number of moles = 3.8 g/ 159.6 g/mol

Number of moles = 0.02 mol

Concentration:

Molarity = Number of moles / volume in L

By putting values,

Molarity = 0.02 mol / 0.25 L

Molarity = 0.08 mol/L

Molarity = 0.08 M

6 0
3 years ago
Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to
Ber [7]

Answer:

H₂Se

Explanation:

A way of estimating the acidity of a weak acid is by analizing the<em> stability of the formed anion</em>. In this case, we should find a Group 6A element that in its anionic forms (HX⁻ and X⁻²) is more stable than HS⁻ and S⁻², thus it would be more acidic in aqueous solution.

The anionic forms of Se are more stable than the forms of S, similarly to how Br⁻ is more stable than Cl⁻.

8 0
3 years ago
Other questions:
  • Heredity is defined as
    12·1 answer
  • The Factor Being Measured In An Experiment Is The _____ ? Plz Help
    15·1 answer
  • What will molecules do at -272 degrees celsius​
    5·1 answer
  • Ozone(O3) number of atoms
    14·1 answer
  • What is the correct order of the steps in the scientific<br> method?
    15·1 answer
  • How many liters of hydrogen gas is produced from 3.712 g of magnesium with 104.2ml of 1.385 mol/L HCL (aq) at SATP?
    7·1 answer
  • 1 point
    11·1 answer
  • LINKS WILL BE REPORTED PLEASE HELP
    12·2 answers
  • K2HPO4 is a highly water-soluble salt. It can be used as a buffering agent, food additive, or
    11·2 answers
  • What would be the vital capacity be for a man that has a tidal volume of 500mL, a residual volume of 1100 mL, an expiratory rese
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!