B. zinc, gold, aluminium, oxygen.
C. nitrogen, copper, mercury, water.
D. Chlorine, argon, sodium, limestone.
A list that contains only element is option B which include zinc, gold, aluminum, and oxygen.
A chemical element may be defined as a type of simple substance that significantly cannot be broken down or fragmented into smaller parts or changed into another substance.
The basic part of an element is an atom, which contains subatomic particles like protons, neutrons, and electrons. All atoms of an element have the same number of protons. In list A, the air is not an element, in list C, water is not an element, in list D, limestone is not an element. While list B includes all elements like zinc, gold, aluminum, and oxygen.
Therefore, a list that contains only elements is option B which includes zinc, gold, aluminum, and oxygen.
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Answer:
480.40 g.
Explanation:
2 SO₂(g) + O₂(g) → 2 SO₃(g),
it is clear that 2.0 moles of SO₂ react with 1.0 mole of oxygen to produce 2.0 moles of SO₃.
∵ 2.0 moles of SO₂ produce → 2.0 moles of SO₃, from the stichiometry.
∴ 6.0 moles of SO₂ produce → 6.0 moles of SO₃.
mass = no. of moles x molar mass of SO₃ = (6.0 moles)(80.066 g/mol) = 480.396 g ≅ 480.40 g.
Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O
Explanation:
The equation is now balanced.
2 atoms H in both reactant and product side.
Cl have 2 atoms on both sides.
Ca have 1 atom in both sides.
C have 1 atom on both sides and
O have 3 atoms on both reactant and product side
The different crystal systems differ from each other in the angles between the axes and the lengths of the axes.
There are seven crystal systems:
The cubic crystal system has the highest symmetry, while the triclinic crystal system has the lowest symmetry. The symmetry of a crystal system determines the properties of the crystal, such as its hardness, density, and electrical conductivity.
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