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
nekit [7.7K]
3 years ago
13

What does the group number of A elements in the A/B numbering system)

Chemistry
1 answer:
Ivanshal [37]3 years ago
4 0

Answer:

All elements in the same A group will have the same number of

valence electrons.

Explanation:

Group A has 1 valence electrons.

You might be interested in
What will happen when the rates of evaporation and condensation are equal​
Ilia_Sergeevich [38]
A random person put the answer for you
6 0
3 years ago
Calculate in gramm the mass of 0.1 mole of hydrochloric acid(h=1 ,cl=35.5)​
babunello [35]

Answer:

mass of HCl = 3.65 g

Explanation:

Data Given:

Moles of hydrochloric acid HCl = 0.1 mole

Mass in grams of hydrochloric acid HCl = ?

Solution:

Mole Formula

                  no. of moles = Mass in grams / molar mass

To find Mass in grams rearrange the above Formula

                Mass in grams = no. of moles x molar mass . . . . . . . (1)

Molar mass of HCl = 1 + 35.5 = 36.5 g/mol

Put values in equation 1

              Mass in grams = 0.1 mole x 36.5 g/mol

              Mass in grams = 3.65 g

mass of HCl = 3.65 g

6 0
3 years ago
Let’s assume that you put a balloon into the freezer. Initially,the balloon had 3.0liters of gas at a pressure of 400kPa and was
EastWind [94]
Here, we should use combined gas law which can be derived from combined gas law, “PV=nRT”. Rearranging, we can get PV/T=nR. Then we can set the two states in the problem together to get

P1V1/T1 = P2V2/T2

Then just plug in and solve algebraically.

Hope this helps
6 0
3 years ago
Which of the following is the best reference for more information regarding compounding?
stiks02 [169]

Compounding Corner on RxNet is the best reference for more information regarding compounding

<u>Explanation:</u>

RxNet is an open online community, consolidating scientists from the domains of chemistry, biochemistry and expanding industry of drug innovation and improvement. Compounding presents an innovative way for pharmacists to customize prescriptions to suit the requirements of their patients.

The art of compounding employs advanced medicine while still sticking to the roots of the profession of pharmacy. Compounding pharmacies can create unparalleled dosage forms based on patient preferences. Compounded medicines are usually reliable and sufficient for most victims who have spoken to their physician about their wellness.

6 0
3 years ago
When a strong acid is titrated with a strong base using phenolphthalein, the color changes suddenly at the end point. The color
larisa86 [58]

Answer:

Keto - enol tautomerism

Explanation:

Phenolphthalein is an organic molecule (formula: C20H14O4), which is used in to determine the final volume in an acid-base titration, this is, as the molecule changes from one to another color, depending on the Ph of the solution (in acids solution, the molecule remains colorless, while in basics solutions it remains pink)  :

The molecule of phenolphthalein is a week acid, which losses a proton (H+) when it´s in solution: the undissociated molecule is colorless, while the correspondent anion (without a H+) is pink. This may be simplified with the following reaction:

H₃In⁺ ⇄ H₂In (colorless) ⇄ In⁻² (pink) ⇄ In(OH) ⁻³

- When adding a base (for example, NaOH) to phenolphthalein (initially, a colorless solution), molecule losses one H⁺ and we obtain In⁻², which is pink

- When adding an acid, the original structured is recovered, so color turns from pink to colorless

This change color is not only explained with adding an acid or a base, but also with phenolphthalein structure, that leads to a keto-enol tautomerism: as molecule has 2 hydroxyl groups (- OH) and 1 carbonyl group (C = O), compounds with this structure have an equilibrium between both groups:

R1 = C H– OH ⇄  R1 – C = O

With this change, phenolphthalein structure changes and hence, color solution changes as well

4 0
3 years ago
Other questions:
  • Helppppppppppppppppppppp
    12·1 answer
  • Write the number 345 in scientific notation, with the same number of significant figures:
    12·1 answer
  • How would you measure the pH of a coloured substance such as red ink.why?
    14·1 answer
  • A cloud that forms near the ground
    10·2 answers
  • Based on the chart, which food chain best models a flow of energy in this ecosystem?
    6·1 answer
  • An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.
    12·1 answer
  • 16. The atomic number of an atom is always equal to the total number of
    11·1 answer
  • If the results of an experiment disprove a hypothesis, then the a. results should not be reported. b. hypothesis is just a theor
    7·1 answer
  • Help please really need help
    6·1 answer
  • What is ionic bonding<br>​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!