The volume of a fixed mass of a gas is directly proportional to the temperature
Chadwick discovered the existence of neutrons which accounts for isotopy.
Isotopes exists because atoms of the same element may differ in the number of neutrons present in each one. This phenomenon is called isotopy.
Chadwick discovered the existence of isotopes by bombarding Beryllium with alpha particles obtained from Polonium decay.
The discovery of the existence of neutrons led us to the a better understanding of isotopes since isotopes differ only in the number of neutrons present.
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Answer:
Both A and B
Explanation:
A.
the limestone, because the acidic groundwater would dissolve the rock's calcite
B.
the granite, because the acidic groundwater would oxidize the rock's iron
Answer:
1) 3.0 moles.
2) 2.0 moles.
3) 2.0 moles of H atoms.
4) 4. 6.02 x 10²³.
Explanation:
<u><em>Q1: How many moles of chlorine are present in 3 moles of MgCI₂?</em></u>
- MgCl₂ is dissociated according to the equation:
<em>MgCl₂ → Mg + Cl₂.</em>
<em>Every 1.0 mole of Mg is dissociated to 1.0 mol of Mg and 1.0 mol of Cl₂.</em>
∵ 1.0 mol of MgCl₂ gives 1.0 mol of Cl₂.
∴ 3.0 mol of MgCl₂ gives 3.0 mol of Cl₂.
<em><u>Q2: How many moles of H₂0 are needed to produce 1 mole of O₂ in the following equation? 2H₂O → 2H₂ + O₂.</u></em>
- From the balnced equation:
<em>2H₂O → 2H₂ + O₂.</em>
2.0 moles of H₂O produce 2.0 moles of H₂ and 1.0 mole of O₂.
∴ We need 2.0 moles of H₂O to produce 1.0 mole of O₂.
<em><u>Q3: How many moles of hydrogen atoms are present in 1 mole of H2 gas?</u></em>
- H₂ is dissociated according to:
<em>H₂ → 2H.</em>
1.0 mol of H₂ is dissociated to produce 2 atoms of H.
∴ 1.0 mol of H₂ contains 2.0 moles of H atoms.
<u><em>Q4: How many atoms or molecules are in a mole?</em></u>
<u><em /></u>
- It is known that every mole of any compound contains Avogadro's number of atoms or molecules (6.022 x 10²³).
So, the answer is: 4. 6.02 x 10²³.
Answer: 4
Explanation: The law of superposition states that in a sequence of rock layers, the youngest layer is on the top, and the oldest one is on the bottom, each being younger than the one beneath it and older than the one above it.