CHEMISTRY HIGH SCHOOL

Chromium, calcium, and potassium are near each other on the periodic table and have some common characteristics but differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?calcium, chromium, potassium
chromium, calcium, potassium
potassium, calcium, chromium
potassium, chromium, calcium

Answers

Answer 1
Answer:

Answer: The correct order is:

Potassium > calcium > chromium

Explanation:

Potassium belongs to the group of alkali metals with group number 1 in a periodic table. Potassium easily displaces hydrogen atom from the water molecule.

Where as calcium belongs to group (II) and easily displaces hydrogen atom from the water molecule.

In a reactivity series potassium is comes before the calcium metal which means that it is more reactive than calcium metal.

Potassium > calcium

Where as chromium metal is member of group 6 and chromium reacts with steam and acids to form hydroxides. But doesn't reacts with water(in liquid phase) which means it less reactive then potassium and calcium.

Potassium > calcium > chromium
Answer 2
Answer:

potassium, calcium, chromium

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Carbon disulfide has a vapor pressure of 363 torr at 25 °C and a normal boiling point of 46.3 °C.

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Vapor pressure or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system. It is an indication of the thermodynamic tendency of a liquid to evaporate.

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I am not so sure, but based on what I'm seeing on the periodic table, the answer should be 3,827 degrees Celsius.

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1

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What occurs when an atom loses an electron?(1) The atom’s radius decreases and the atom becomes a negative ion.
(2) The atom’s radius decreases and the atom becomes a positive ion.
(3) The atom’s radius increases and the atom becomes a negative ion.
(4) The atom’s radius increases and the atom becomes a positive ion.

Answers

When an atom loses an electron, it becomes a positive ion and the radius of the atom decreases. The correct answer is option 2.

An atom is the basic unit of matter that consists of a nucleus, which contains positively charged protons and uncharged neutrons, surrounded by a cloud of negatively charged electrons.

  • The valence shell determines the size of the atom, and when an electron is removed from this shell, the size of the atom decreases. The loss of an electron from an atom creates a positively charged ion, called a cation.
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Therefore, option 2. The atom’s radius decreases, and the atom becomes a positive ion is the correct answer.

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Answer:

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