Answer:
A chemist burns calcium carbonate, CaCO3, to produce carbon dioxide, CO2, and a white powder, CaO. The following chemical equation shows the reaction.
Explanation:
m carbonate, CaCO3, to produce carbon dioxide, CO2, and a white powder, CaO. The following chemical equation shows the reaction.
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B. Use numbers of atoms to describe the amounts of calcium, carbon, and oxygen before and after the reaction.
The reaction is decomposition of calcium carbonate into calcium oxide and carbon dioxide. Here, calcium carbonate and calcium oxide are solids and carbon dioxide is gas.
What is calcium calcium carbonate?Calcium carbonate is an abundant mineral of calcium which is deposited in many living and non-living things. Calcium carbonate is also called limestone, chalk, calcite etc.
Calcium carbonate is present in shells of some animals. It is prepared by passing carbon dioxide gas through calcium oxide. Calcium oxide is otherwise called lime or quicklime. which is able to spontaneously absorb carbon dioxide.
Carbon dioxide is the only gas form in this reaction and which make the reaction system heterogenous. In the reaction one mole of calcium carbonate produces one mole of each calcium oxide and carbon dioxide.
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Which of the following are isotopes, choose all that apply.
Element X with atomic number 10 and atomic mass 21
Element Y with atomic number 11 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Element M with atomic number 12 and atomic mass 21
Answer:
Element X with atomic number 10 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Explanation:
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
Isotopes of an element have the same electronic configuration. They share the same chemical propertiesThey only differ in their masses.So, Element X and Z with atomic number 10 which is their number of electrons are isotopes. Their mass number, 21 and 22 differs.
Analyze: The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen
Answer:
See explanation
Explanation:
Hydrogen has a valency of +1 or -1. Its electronic configuration is 1s1.
The 1s sub-level (first shell) is known to hold two electrons. This means that hydrogen may either loose this one electron in the 1s level to yield H^+ or accept another electron into this 1s level to form H^- (the hydride ion).
The formation of the hydride ion completes the 1s orbital.