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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.
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Hich sentence most accurately describes electrically charged objects?
Ket [755]

Answer:

They attract or repel other charged objects without touching them.

Explanation:

My chemistry teacher always says like repels like opposite attracts.

4 0
3 years ago
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What visual criterion is to be used to assess whether the crude reaction product is dry prior to semimicro distillation
Olenka [21]

The visual criterion which has to be assessed  is to ensure it's not oily or sticky.

<h3>What is Distillation?</h3>

This is a separation technique that involves the use selective boiling and condensation to separate a liquid mixture into different components.

In the case of Crude reaction product , it is best to ensure that it is not oily or sticky before semimicro distillation is done.

Read more about Distillation here brainly.com/question/552187

5 0
2 years ago
The atomic number of lead is 82. Its mass number is 207?.how many protons neutrons and electros does the atom of lead contain
kupik [55]

Lead have:

82 electrons

82 protons

125 neutrons

Explanation:

The number of electrons and protons are given by the atomic number of the element.

Lead have 82 electrons and 82 protons.

The number of neutrons are given by the difference between the mass number and atomic number.

For lead number of neutrons = 207 - 82 = 125.

Learn more about:

particles in the atom

brainly.com/question/439508

#learnwithBrainly

4 0
3 years ago
Write balance complete molecular equation, ionic equation, and net ionic equations for the reactions that occur when each of the
AveGali [126]

<u>Answer:</u> The complete molecular, ionic, and net ionic equations are given below. The spectator ions are sodium and nitrate ions.

<u>Explanation:</u>

The ionic equation is defined as the equation in which all the substances that are strong electrolytes present in an aqueous state and are represented in the form of ions.

The net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.

The balanced molecular equation for the reaction of lead (II) nitrate and sodium sulfide follows:

Pb(NO_3)_2(aq)+Na_2S(aq)\rightarrow PbS(s)+2NaNO_3(s)

The ionic equation follows:

Pb^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)\rightarrow PbS(s)+2Na^+(aq)+2NO_3^-(aq)

As sodium and nitrate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

Pb^{2+}(aq)+S^{2-}(aq)\rightarrow PbS(s)

3 0
3 years ago
Is a solution with a pH less than 7 acidic, alkaline or neutral?
lubasha [3.4K]

pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).

7 0
3 years ago
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