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
yawa3891 [41]
2 years ago
11

Mendeleev arranged the known chemical elements in a table according to increasing

Physics
2 answers:
sladkih [1.3K]2 years ago
8 0
1- mass 2. 3 3. Li2O 4. Of the strong attraction..................
wlad13 [49]2 years ago
6 0
<h3>1. <u>Answer</u>; </h3>

Mass

Mendeleev arranged the known chemical elements in a table according to increasing <u>mass</u>.

<h3><u>Explanation</u>; </h3>
  • <em><u>Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column. He provided an organizing principle that worked for all off the known elements. </u></em>
  • The close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be. He also left spaces for undiscovered elements in order to place elements with similar properties in the same column.
  • Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown elements.
<h3>2. <u>Answer; </u></h3>

Atomic mass unit.

One twelfth the mass of a carbon-12 atom is used to define an<em><u> atomic mass unit </u></em>

<h3><u>Explanation</u>; </h3>
  • <em><u>An atomic mass unit (AMU) refers to precisely 1/12 the mass of an atom of carbon-12.</u></em> The carbon-12 atom has six protons and six neutrons in its nucleus. One AMU is the average of the proton rest mass and the neutron rest mass.
  • <em><u>The mass of an atom in atomic mass unit is approximately equal to the sum of the number of protons and neutrons in the nucleus. </u></em>
  • The atomic mass unit expresses the relative masses of various isotopes of elements.  

<h3>3. <u>Answer</u>; </h3>

Five electrons  

A member of the boron family has three valence electrons, while a member of the nitrogen family has<u> five electrons</u>.

<h3><u>Explanation</u>; </h3>
  • The number of valence electrons is the number of electrons in the outermost energy level of an atom.  
  • <em><u>Nitrogen family includes, non-metals, metalloids, and metals. The atoms of these elements in the nitrogen family have a 5 valence electrons. </u></em>The family include elements, phosphorus, bismuth, arsenic and antimony. They form bonds through sharing of electrons.
<h3>4. <u>Answer; </u></h3>

Li2O

<h3><u>Explanation; </u></h3>
  • <em><u>Ionic compounds are compounds that are made up of ions. They are formed as a result of transfer of electrons from one atom to another.</u></em> One atom loses electrons while the other atom gains electrons, resulting to formation of negatively charged ion (anion) and positively charged ion (cation) which join via ionic bond to form an ionic compound.
  • <em><u>Lithium oxide is an example of ionic compound formed from lithium and oxygen atoms. Lithium has a valency of one while oxygen has a valency of two, therefore, the chemical formula of lithium oxide will be Li2O.  </u></em>

<h3>5. <u>Answer</u>; </h3>

Of the strong attractions between polar water molecules

Water has a higher boiling point than expected because <u>of the strong attractions between polar molecules. </u>

<h3><u>Explanation;  </u></h3>
  • Water has a high boiling point because of intermolecular forces of attraction called hydrogen bonds. <u>Hydrogen bonding</u> is a form of dipole-dipole interaction, where a molecule that is partially positive is attracted to another molecule that is partially negative.  
  • <em><u>Hydrogen bond being a powerful intermolecular force, it makes water to have a high boiling point, because they require more energy to break the bond.</u></em>


You might be interested in
How much can having a lighted candle increase the temperature inside the shelter?
oksian1 [2.3K]
A lighted candle produces heat however not as much heat as a heater or the sun would.
8 0
3 years ago
Witch sentence states Newton third law
Dominik [7]

Answer:

For every action, there is an equal and opposite reaction.

Explanation:

Physics helps alot lol

7 0
3 years ago
a 5.0 charge is placed at the 0 cm mark of a meterstick and a -4.0 charge is placed at the 50 cm mark. what is the electric fiel
Lesechka [4]

Answer:

-1748*10^N/C

Explanation:

See attached file

8 0
3 years ago
Transverse, surface, and longitudinal waves are all __________ waves because they __________.
algol [13]

Answer:

a. mechanical; require a medium to travel through

Explanation:

Longitudinal, transverse and surface waves are types of mechanical waves. For example, within the longitudinal waves are the sound waves, which needs a medium to propagate like the air. This is why sound does not travel in a vacuum.

And an example of a transverse wave is the waves that form in the water when a rock is thrown (ripples), these waves need a medium (the water) to propagate.

On the other hand, electromagnetic waves such as light waves do not need a medium to propagate, this is why we can see the light of distant stars because their light travels through the vacuum until it reaches us.

So, the answer is:

Transverse, surface, and longitudinal waves are all mechanical waves because they require a medium to travel through .

5 0
3 years ago
A string is wrapped around a pulley with a radius of 2.0 cm and no appreciable friction in its axle. The pulley is initially not
stiks02 [169]

Answer:

2

Explanation:

2

5 0
2 years ago
Read 2 more answers
Other questions:
  • Which of the following has the least amount of kinetic energy?
    6·1 answer
  • In a certain process, the energy change of the system is 250 \rm kJ. The process involves 480 \rm kJ of work done by the system.
    9·1 answer
  • What to press when leaving laptop for a moment?
    8·1 answer
  • A spring whose spring constant is 270 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu, required
    12·1 answer
  • The law of reflection states that if the angle of incidence is 76 degrees, the angle of reflection is ___ degrees.
    7·1 answer
  • What is newtons first,second, and third law?
    8·1 answer
  • Pls help i give brainliest
    6·2 answers
  • Which parameter of a projectile depends on the horizontal as well as the vertical component of velocity of projection?
    13·2 answers
  • Prove that, s=u+v/2<br>please I need help ​
    5·1 answer
  • What is an inclined plane? How does it make our work easier?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!