1. Which of the following contains only elements? * a. Magnesium, water, and chloride b. Air, mercury, and calcium c. Argon, sodium, and carbon dioxide d. Iron, gold, and carbon 2. Which of the following are two of the gaseous compounds? * a. Copper sulfate and water b. Sodium chloride and iron (III) oxide c. Air and carbon dioxide d. Steam and carbon dioxide 3. Which of the following are the greenhouse gases that contribute to global warming? * a. Ozone, carbon dioxide, and sulfur dioxide. b. Methane, nitrogen dioxide, and carbon monoxide. c. Carbon monoxide, carbon monoxide, and ozone d. Sulfur dioxide, unburned hydrocarbon, and ozone 4. Which of the following is not reducing carbon dioxide in the air? * a. Turn on electronic devices when not in use b. Tap alternative sources of energy like solar energy wind energy, hydroelectric energy… c. Take public transport instead of driving to work, reuse and recycle. d. Plant more trees 5.Which is not the property of metal? * a. Good conductor of heat and electricity b. High melting points and boiling points c. Hard and shiny appearance d. Not malleable nor ductile 6.What is conserved during any change? * a. Color b. Volume c. identity d. mass 7.Which of the following is the source of methane? * a. Motorcar b. Volcanic eruption c. Decomposition of plant and animal matter d. Forest fire
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A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.[1] The coefficients next to the symbols and formulae of entities are the absolute values of the stoichiometric numbers. The first chemical equation was diagrammed by Jean Beguin in 1615.[2]
Formation of chemical reaction Edit
A chemical equation consists of the chemical formulas of the reactants (the starting substances) and the chemical formula of the products (substances formed in the chemical reaction). The two are separated by an arrow symbol ({\displaystyle \rightarrow }\rightarrow , usually read as "yields") and each individual substance's chemical formula is separated from others by a plus sign.
As an example, the equation for the reaction of hydrochloric acid with sodium can be denoted:
2 HCl + 2 Na → 2 NaCl + H
2
This equation would be read as "two HCl plus two Na yields two NaCl and H two." But, for equations involving complex chemicals, rather than reading the letter and its subscript, the chemical formulas are read using IUPAC nomenclature. Using IUPAC nomenclature, this equation would be read as "hydrochloric acid plus sodium yields sodium chloride and hydrogen gas."
This equation indicates that sodium and HCl react to form NaCl and H2. It also indicates that two sodium molecules are required for every two hydrochloric acid molecules and the reaction will form two sodium chloride molecules and one diatomic molecule of hydrogen gas molecule for every two hydrochloric acid and two sodium molecules that react. The stoichiometric coefficients (the numbers in front of the chemical formulas) result from the law of conservation of mass and the law of conservation of charge (see "Balancing Chemical Equation" section below for more information).