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Alex
3 years ago
9

How did Mendeleev arrange the known elements in his periodic table? O A. According to the number of protons O B. According to th

e number of electrons O C. According to atomic mass O D. According to atomic number​
Chemistry
1 answer:
jeka943 years ago
6 0

Explanation:

Features of Mendeleev's tables

Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .

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N(H₂O)=1g÷18g/mol=0,055mol
N(H₂O)=0,055mol · 6·10²³ 1/mol (Avogadro number)= 3,33·10²² molecules.
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What is the temperature of water when baking soda and citric acid is mixed with it?
asambeis [7]

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Explanation:

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4 0
3 years ago
Y’all what’s this I don’t feel like doing it and I’ll give brainlist too
maw [93]

Answer:

2.Closed System: A closed system is a thermodynamic system where energy can be exchanged with its surrounding but not matter. Open System: Open systems can exchange matter with the surrounding. Closed System: Closed systems cannot exchange matter with the surrounding. Open System: The mass of the system will vary with time in open systems.

Explanation:

1.The particle model is the name for the diagrams used to draw solids, liquids and gases. In the model, the particles are shown as circles or spheres. However, the particles in ice, liquid water and steam look the same because they are all water, but in different states of matter. Why do we use the particle model in science?

3.An open system can be defined as a system which can exchange both matter and energy with the surrounding. For example, the earth can be recognized as an open system. In this case, the earth is the system, and space is the surrounding. Sunlight can reach the earth surface and we can send rockets to space.

3 0
3 years ago
How does a trigonal pyramid differ from a tetrahedron so far as molecular geometry is concerned? Bond angles in the tetrahedral
Lunna [17]

Answer:

A trigonal pyramid is a tetrahedron with one vacant vertex.

Explanation:

<em>How does a trigonal pyramid differ from a tetrahedron so far as molecular geometry is concerned? </em>

<em>Bond angles in the tetrahedral molecule are 120°, while those for trigonal pyramid are 109.5°.</em>  FALSE. Bond angles in the tetrahedral are 109.5°, while those for the trigonal pyramid are slightly lower than 109.5° due to the repulsion of the unshared pair of electrons on the central atom.

<em>A trigonal pyramid is a tetrahedron with two vacant vertex.</em> FALSE.

<em>A trigonal pyramid is a tetrahedron with one vacant vertex.</em> TRUE. This is the geometry of NH₃, in which the central atom is bonded to 3 atoms and has 1 unshared pair of electrons.

<em>Bond angles in the tetrahedral molecule are 109.5°, while those for trigonal pyramid are 120°.</em> FALSE.

<em>A tetrahedron has a square base, while the base of a trigonal pyramid is a triangle.</em> FALSE. Both have a triangular base.

8 0
4 years ago
If an atom is found to have an atomic mass equal to 3 times greater than carbon, what is its atomic mass?______ A.M.
Rufina [12.5K]
It would be 36 because the atomic mass of carbon is 12

7 0
3 years ago
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