In a chemical reaction, the products are found on the left side of the arrow, yes, no, The arrow in a chemical equation means “ is equivalent to”., yes, no, A skeleton equation shows the formulas of the compounds participating in a chemicalreaction and their states of matter but not the ratio in which they react. 4, yes, no, Word equations use words to indicate reactants and products of chemical reactions, yes, no, In a chemical reaction, the reactants are on the left side of the arrow, and the products are on the right side., yes, no, The arrow in a chemical equation means yield or produces, yes, no, In a chemical equation, (aq) after one of the substances means that it is which ofthese?, a. a solid formed from two ionic substances, c. dissolved in water, b. released as gas, d. produced from nothing, How many total atoms are in 3Na2SO4?, 21, 24, 10, 18, 3. How many total atoms are in 4Ca3(PO4)2?, 36​, 52, What are the correct coefficients when this equation is balanced? Sb + O2 → Sb4O6, a.1,2,10, b. 4,6,1, c.4,3,1, d. 10,5,1, What are the correct coefficients when this equation is balanced? K + Br2 → KBr, a.1, 1, 1, b.1, 2, 1, c.2, 1, 2, d.2, 1, 1, In a chemical equation, (aq) after one of the substances means that it is which of these?, a. a solid formed from two ionic substances, b. released as gas, c.dissolved in water, d.produced from nothing, A + B → AB, a. Single-replacement, b. Combustion, c. Synthesis, d. Double-replacement, A + O₂ → AO, a. Single-replacement, b. Combustion, c. Synthesis, d. Double-replacement, AB → A + B, a. Single-replacement, b. Decomposition, c. Synthesis, d. Double-replacement, A + BX → AB + B, a. Single-replacement, b. Decomposition, c. Synthesis, d. Double-replacement, . AX + BY → AY + BX, a. Single-replacement, b. Decomposition, c. Synthesis, d. Double-replacement, When most chemical reactions take place, some in the reactants must be broken, aprocess that requires energy., a.compounds, b.precipitates, c.chemical bonds, d.Products, What type of reaction is shown in the following chemical equation:2H2O --> 2H2 + O2?, a.decomposition, b.single–displacement, c.double–displacement, d.Synthesis, The breaking down of a substance into two or more simpler substances is, a.decomposition, b.a catalyst, c.displacement, d.Synthesis, When one element replaces another element in a compound, the reaction is areaction, a.decomposition, b.double–displacement, c.single–displacement, d.Synthesis, A decomposition reaction breaks down one compound into simpler substances →, a.compound = element + element, b.compound + compound = compound + compound, c.element + compound = element + compound, d.element + element = compound, How does the Activity Series show that sodium will replace copper in a reaction?, a. Sodium is below copper in the activity series., b. Sodium is more reactive than copper and is above it in the activity series., Describe and identify the type of reaction that occurs to produce water., a. It is a synthesis reaction because hydrogen and oxygen combine to form water., b. It is a decomposition reaction because water breaks down., c. It is a double-replacement reaction because two compounds exchange parts, How many reactants are needed for a decomposition reaction?, 1, 2, 3, What type of reaction is this? 2KClO3​→2KCl+3O2, Synthesis, Decomposition, What is the correct skeleton equation for the reaction between aqueous sodium hydroxide and aqueous calcium bromide?, a. NaOH(s) + CaBr₂(aq) → Ca(OH)₂(aq) + NaBr(s), b. NaOH(aq) + CaBr₂(aq) → Ca(OH)₂(s) + NaBr(aq), In the reactants in q27 , how many bromine (Br) atoms are there?, 1, 2, 3, In the products of q 27 , how many oxygen (O) atoms are there?, 1, 2, 3, In q 27 , Which type of chemical reaction is represented by this equation?, Single replacement, Double replacement, To balance the equation NaOH(aq) + CaBr₂(aq) → Ca(OH)₂(s) + NaBr(aq), what coefficient is needed in front of NaOH and NaBr?, 1, 2, 3, What scientific law did Antoine Lavoisier establish?, a. The Law of Multiple Proportions, b. The Law of Conservation of Mass, c. The Law of Constant Composition, According to Lavoisier’s discovery, the total mass of the products in a chemical reaction always equals:, a. The total mass of the reactants, b. Twice the mass of the reactants, c. Half the mass of the reactants, Which substance did Lavoisier experiment with to study chemical changes?, Water, b. Mercury, c. Oxygen, What was Lavoisier’s main contribution to chemistry?, He invented the periodic table, b. He proved atoms could not be divided, c. He showed that mass is conserved during chemical reactions, What substance did Lavoisier heat in a sealed container during his experiment?, a. Mercury metal, b. Mercury(II) oxide (mercury calx), c. Oxygen gas, What visible change did Lavoisier observe when he heated mercury(II) oxide?, a. It melted into a red powder, b. The red powder changed into silvery liquid mercury and a gas, c. The liquid mercury turned into a solid, What did Lavoisier discover about the masses of the reactants and products?, The total mass increased after heating, b. The total mass decreased after heating, c. The total mass remained exactly the same, What gas was produced when mercury(II) oxide was heated?, Carbon dioxide, Hydrogen, Oxygen, 1. In which type of reaction do two or more substances combine to form a single new substance?, a. Decomposition, b. Synthesis, Which type of reaction is the reverse of a synthesis reaction?, a. Combustion, b. Decomposition, c. Double replacement, What is usually required to make a decomposition reaction occur?, a. Cold temperatures, b. Heat, light, or electricity, c. Water, In which type of reaction does a substance react with oxygen to produce energy in the form of heat and light?, a. Decomposition, b. Combustion, c. Synthesis, What is a common characteristic of combustion reactions?, . They absorb energy., b. They produce one or more products that contain the elements in the reactants., c. They occur only in liquids., What happens in a single-displacement reaction?, Two compounds exchange ions., b. One element replaces another element in a compound., c. Two elements combine to form one compound., What determines whether a metal can replace another metal in a compound?, a. Its atomic mass, b. Its color, c. Its reactivity — a more reactive metal replaces a less reactive one, What happens in a double-displacement reaction?, a. A metal reacts with oxygen to produce heat., b. One compound’s positive ion replaces the other’s positive ion to form two new compounds., c. A single compound breaks down into simpler substances., A double-displacement reaction usually occurs when:, . A precipitate, water, or gas forms, b. Oxygen is added to a compound, c. The reaction produces only heat and light, What is a precipitate?, A gas released during a reaction, b. A soluble compound that dissolves in water, c. An insoluble compound that forms and comes out of the solution, In a double displacement reaction, what is exchanged between the compounds?, a. Electrons, b. Positive and negative ions, c. Neutrons, Which of the following best describes a double displacement reaction?, a. Two elements combine to form one product, b. One element replaces another in a compound, c. Two ionic compounds exchange ions to form new compounds, A double displacement reaction can be identified when:, a. Light is produced, b. Heat is absorbed, c. A solid, liquid (like water), or gas forms, 1. What does the term oxidation mean in chemistry?, a. The gain of electrons, b. The loss of electrons, c. The sharing of electrons, What does the term reduction mean?, a. The loss of electrons, b. The gain of electrons, c. The combination with oxygen, . Why is oxygen often involved in oxidation-reduction reactions, It is unreactive and stable, b. It pulls electrons from other elements because it is very reactive, c. It adds mass to the products, Which visible process is a result of oxidation-reduction reactions involving metals?, Melting of metal, Corrosion or rusting of metal, What type of reactions involve the transfer of electrons, a. Precipitation reactions, b. Oxidation-reduction (redox) reactions

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