direct chemical reactions and decomposition chemical reactions

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Hard quiz on composition, decomposition chemical reactions

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direct chemical reactions and decomposition chemical reactions


Froggy Jumps direct chemical reactions and decomposition chemical reactionsVersión en línea Hard quiz on composition, decomposition chemical reactions por Mirai 1 What defines a direct combination chemical reaction? a Energy changes but no new bonds form b A compound breaks into two or more products c Two or more elements/compounds combine to form one product 2 Which general form represents a direct combination reaction? a AB → A + B b A + B → AB c A → B + C 3 Give an example of a direct decomposition reaction. a 2HgO(s) --energy→ 2Hg(l)+O2(g) b NaCl → Na+ + Cl− c Cu + O2 → CuO 4 What happens in decomposition reaction? a Two elements form a new compound b A compound breaks into two or more simpler substances c A substance gains electrons 5 Which statement best describes reaction of metal with dilute acid? a Metal dissolves without gas release b Metal reacts with acid to produce hydrogen gas and a salt c Acid neutralizes but no gas formed 6 Which equation shows a metal reacting with dilute acid? a Zn + O2 → ZnO b MgO + H2 → Mg + H2O c Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) 7 In a decomposition reaction, what happens to the product molecules? a One compound breaks into two or more simpler substances b Two or more substances combine into one c Electrons are transferred between ions 8 What is a key observation of a reaction between metals and dilute acids? a Hydrogen gas is released and a salt is formed b Color change only, no gas c Metal dissolves without any gas 9 Which statement best contrasts direct and decomposition reactions? a Both always release heat b Direct reactions never involve gases c Direct: multiple substances form one product; Decomposition: one substance forms multiple products 10 What role does the activity series play in metal-acid reactions? a Less reactive metals displace hydrogen b Activity series has no effect on displacement c More reactive metals displace hydrogen from acids 11 in which color does magnesium burns? a Black b Green c Bright white 12 which of the following metals is highly reactive a Fe b Li c H 13 which of the following metals have moderate activity a Au b Zn c K 14 which of the following metals do not react a Mg b Na c Pt 15 which of the following burn with pop sound a Oxygen b Hydrogen c Helium

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direct chemical reactions and decomposition chemical reactionsVersión en línea

por Mirai

What defines a direct combination chemical reaction?

Which general form represents a direct combination reaction?

Give an example of a direct decomposition reaction.

What happens in decomposition reaction?

Which statement best describes reaction of metal with dilute acid?

Which equation shows a metal reacting with dilute acid?

In a decomposition reaction, what happens to the product molecules?

What is a key observation of a reaction between metals and dilute acids?

Which statement best contrasts direct and decomposition reactions?

What role does the activity series play in metal-acid reactions?

in which color does magnesium burns?

which of the following metals is highly reactive

which of the following metals have moderate activity

which of the following metals do not react

which of the following burn with pop sound