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
mamaluj [8]
3 years ago
5

Why does the d block start in the fourth row of the periodic table

Chemistry
1 answer:
natita [175]3 years ago
3 0

Answer:

Why does D-block start on the fourth row of the periodic table?

Explanation:

The require more energy to reach 3d than 4s, and they fill up 4p before 4d, and so forth. ... The energy is lower for 6s than 4f, and 4f and 5f are lower in energy than the final D level.

You might be interested in
What two molecules were condensed in an aldol condensation to produce (ch3)3cch=chcoch3?
inessss [21]
The given compound is being synthesized by condensing Acetone and Pivaldehyde (Trimethylacetaldehyde).

First Acetone is treated with Base, the base abstracts the mildly acidic proton present at alpha position to carbonyl group. The resulting specie called enolate act as a nucleophile and attacks on highly reactive aldehyde which upon dehydration yields the Aldol Product. The Reaction is as follow,

5 0
3 years ago
Students in a chemistry class are drawing molecular models based on molecular formulas they are given by the teacher.
Karo-lina-s [1.5K]
Sorry I need this marks
5 0
3 years ago
Will mark BRAINLIEST
likoan [24]

Answer:

A and D

Explanation:

4 0
3 years ago
What phase change does dry ice go through to change from a gas to a solid
muminat

deposition- gas to solid

sublimation- solid to gas

7 0
3 years ago
Read 2 more answers
Some students have said that a buffer is like a proton (H ) sponge. Evaluate this statement and explain both how a buffer is lik
alisha [4.7K]

Answer:

i)  Buffer absorbs  H^+ and OH^- ions preventing large changes in pH when small amounts of acid or base is added but when large amounts of acid or base is added there will be a change in pH

ii) absorption of liquid is related to a chemical reaction for a buffer system but it is not related a chemical reaction for a proton( H ) sponge.

Explanation:

<u>i) Buffer like a proton ( H ) sponge </u>

Buffer absorbs  H^+ and OH^- ions preventing large changes in pH when small amounts of acid or base is added but when large amounts of acid or base is added there will be a change in pH

The pH of a Buffer follows the Henderson-Hasselbach model

pH = pKa + Log ([A-]/[HA])

when base is added

HA + OH^-   -------> A- + H2O

when acid is added

A^- + H^+   ---------> HA

<u>ii) Buffer not like a proton ( H ) sponge</u>

absorption of liquid is related to a chemical reaction for a buffer system but it is not related a chemical reaction for a proton( H ) sponge.

8 0
2 years ago
Other questions:
  • Name four products of incomplete combustion<br><br> Which 4?<br><br> 1.<br> 2.<br> 3.<br> 4.
    7·1 answer
  • Which nuclear emission has the greatest penetrating power?
    14·1 answer
  • Consider the hydrogen atom as described by the Bohr model. The nucleus of the hydrogen atom is a single proton. The electron rot
    6·1 answer
  • Solve for b, when c= a/b and a = 5.8 and c= 7.4
    11·1 answer
  • Which of the following is a polar molecule?
    13·1 answer
  • 3. Give three examples of a pure substances
    12·2 answers
  • calculate the (m/v) of nacl of a solution made by diluting 25.0 ml of a 7.50 (m/v)% NaCl solution to a total volume of 75.00 ml
    15·2 answers
  • Which of the following two conditions will favor a spontaneous reaction?
    13·1 answer
  • What is the percentage of nitrogen, by mass, in calcium nitrate?.
    6·1 answer
  • What is the parent chain of the following compound? a. hexane b. heptane c. octane d. nonane e. decane
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!