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
saw5 [17]
3 years ago
14

Blocks on the periodic table are formed by elements that have the same atomic mass.

Chemistry
2 answers:
steposvetlana [31]3 years ago
5 0
The answer is False
podryga [215]3 years ago
3 0
False. Elements in each block are organized by their orbital type, which is determined by their highest energy electron.
You might be interested in
Iron sulfite has the formula?
Mademuasel [1]
Its FeSO3 or iron(iii)sulfite = Fe2(SO3)3
7 0
3 years ago
A balloon is filled to a volume of 2.20L at a temperature of 22*C. The balloon is then heated to a temperature of 71*C. Find the
goldfiish [28.3K]

2.565L

Explanation:

  • Charles law states that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.V/T=K

         V1/T1=V2/T2        

          Unit of Kelvin = 273.15

  • To get the absolute temperature, we need to convert the degree celsius temperature to kelvin.

          T1= 22+273.15= 295.15 K

          T2 = 71+273.15= 344.15 K

          V1 = 2.20 L

          V2 =?

          2.20/295.15=V2/344.15

          0.00745 x 344.15 = 2.565 L

Hence,  2.565 L is the new volume of the balloon.

3 0
3 years ago
Which of the following is the last step in performing a titration?
allsm [11]
The last step in performing a titration is <span>determining the concentration of an unknown base. So the answer to your question is letter B. The concentration maybe either an acid or base. The other choices are the earlier procedures in performing titration.</span>
4 0
3 years ago
The standard enthalpy change for the following reaction is 232 kJ at 298 K. 2 H2CO(g) 2 C(s,graphite) + 2 H2(g) + O2(g) ΔH° = 23
Georgia [21]

Answer:  The standard enthalpy change for this reaction is -116 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction is,

2H_2CO(g)\rightarrow 2C(s, graphite)+2H_2(g)+O_2(g)

\Delta H^0=232KJ

Now we have to determine the value of \Delta H for the following reaction i.e,

)C(s, graphite)+H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2CO(g) \Delta H^0'=?

According to the Hess’s law, if we reverse the reaction then the \Delta H will change its sign and if we half the reaction, then the

So, the value \Delta H^0' for the reaction will be:

\Delta H^0'=\frac{(-232kJ/mole)}{2}=-116kJ

Hence, the standard enthalpy change for this reaction is -116 kJ

7 0
3 years ago
Many drugs are sold as their hydrochloric salts (R2NH2 Cl−), formed by reaction of an amine (R2NH) with HCl. a. Draw the major o
lara31 [8.8K]

Answer:

Here's what I find.

Explanation:

a. Structure

Acebutolol is a secondary amine (basic). It forms a substituted ammonium salt when treated with hydrochloric acid.

The structure of the salt is shown below, with a red arrow pointing toward the positive charge on the N atom.

b. Solubility

The formula of acebutolol is C₁₈H₂₈N₂O₄.

The amide, acetyl, and ether groups confer little solubility to the molecule.

The alcohol and secondary amine do confer some solubility, because they can donate and accept hydrogen bonds.

However, they can each overcome the hydrophobic properties of only three to five carbons, and acebutolol has 18 of them.

The free amine would be preferentially soluble in lipid material (fats)

The protonated amine is ionic and therefore much more soluble in aqueous media (e.g., blood).

c. Marketing

The drug must be delivered to the tissues of the heart, where it blocks the effects of adrenalin. The best way to do this is through the blood, so acebutolol is marketed as the hydrochloride salt.

4 0
3 years ago
Other questions:
  • Which of the following describes an endothermic reaction?
    8·2 answers
  • Copper has a specific heat of 0.385 J/gºC.
    5·1 answer
  • What is the volume of 3.00 mole of ideal gas at 100.0 C and 2.00 kPa
    11·1 answer
  • A gas at constant temperature is enclosed in a container with a movable piston. It occupies a space of 10L at a pressure of 500
    5·1 answer
  • Which is another name for a homogenous mixture?
    8·1 answer
  • A certain chemical reaction releases 31.0 kj/g of heat for each gram of reactant consumed. How can you calculate what mass of re
    9·1 answer
  • Describe the particles in each state of matter <br><br> Solid:<br> Liquid: <br> Gas:
    8·1 answer
  • The chemical process of photosynthesis is one that requires a constant supply of energy to proceed; in this
    14·1 answer
  • How many grams is 10 moles of H2O?​
    10·1 answer
  • Select the structure that corresponds
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!