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Questions and Answers
Which statement accurately describes a chemical change?
Which statement accurately describes a chemical change?
- The constituent substances can be easily obtained after the change.
- No new substances are formed during the process.
- One or more new substances are formed during the process. (correct)
- The changes can usually be reversed.
What does the law of conservation of mass state in relation to chemical changes?
What does the law of conservation of mass state in relation to chemical changes?
- Matter disappears during a chemical reaction.
- Matter is not involved in chemical changes.
- Matter is transformed but not created or destroyed. (correct)
- Matter is created and destroyed in chemical changes.
Which of the following is an example of combustion?
Which of the following is an example of combustion?
- Heating sugar to form carbon and water.
- Mixing sodium carbonate with calcium chloride.
- Heating calcium carbonate to form calcium oxide.
- Burning petrol in a car engine. (correct)
During a chemical change, how are the atoms involved?
During a chemical change, how are the atoms involved?
What type of reaction is represented by the formula AB → A + B?
What type of reaction is represented by the formula AB → A + B?
Which of the following best defines precipitation reactions?
Which of the following best defines precipitation reactions?
How can the changes in a physical change be characterized?
How can the changes in a physical change be characterized?
What is a characteristic of chemical changes compared to physical changes?
What is a characteristic of chemical changes compared to physical changes?
What is the correct name for the molecule CO2?
What is the correct name for the molecule CO2?
Which of the following formulas represents a polyatomic ion?
Which of the following formulas represents a polyatomic ion?
What is the prefix used to indicate three atoms in a covalent compound?
What is the prefix used to indicate three atoms in a covalent compound?
Which diatomic molecule is NOT included in the common list of diatomic molecules?
Which diatomic molecule is NOT included in the common list of diatomic molecules?
What is the first step in writing a chemical equation?
What is the first step in writing a chemical equation?
Why is 'mono-' not used in naming the first element in a covalent compound?
Why is 'mono-' not used in naming the first element in a covalent compound?
What is the balanced equation for the reaction of magnesium with oxygen to form magnesium oxide?
What is the balanced equation for the reaction of magnesium with oxygen to form magnesium oxide?
Which of the following represents a correct formula for ammonium?
Which of the following represents a correct formula for ammonium?
What is the primary purpose of antacids in relation to acid-base reactions?
What is the primary purpose of antacids in relation to acid-base reactions?
What type of chemical reaction is respiration classified as?
What type of chemical reaction is respiration classified as?
Why are noble gases generally considered inert?
Why are noble gases generally considered inert?
Which compound is formed when sodium loses one electron?
Which compound is formed when sodium loses one electron?
In the formation of magnesium oxide, how many electrons does magnesium need to lose?
In the formation of magnesium oxide, how many electrons does magnesium need to lose?
What is the main product of the conversion of carbon dioxide and water during photosynthesis?
What is the main product of the conversion of carbon dioxide and water during photosynthesis?
What type of bond formation typically occurs between a metal and a non-metal?
What type of bond formation typically occurs between a metal and a non-metal?
What happens during rusting, which is an example of an oxidation reaction?
What happens during rusting, which is an example of an oxidation reaction?
What is the product of the reaction between NaOH and HCl?
What is the product of the reaction between NaOH and HCl?
Which method of gas collection can be used for gases that are denser than air?
Which method of gas collection can be used for gases that are denser than air?
Which drying agent can be used for neutral and alkaline gases?
Which drying agent can be used for neutral and alkaline gases?
Ammonia cannot be dried using which of the following drying agents?
Ammonia cannot be dried using which of the following drying agents?
Which collection method is suitable for gases like hydrogen and oxygen?
Which collection method is suitable for gases like hydrogen and oxygen?
What characteristic of the gas influences the use of Downward Delivery for collection?
What characteristic of the gas influences the use of Downward Delivery for collection?
Which gases can be dried using concentrated sulfuric acid?
Which gases can be dried using concentrated sulfuric acid?
Which of the following gases cannot be dried using fused calcium chloride?
Which of the following gases cannot be dried using fused calcium chloride?
What is the electron sharing requirement for oxygen in the formation of water (H2O)?
What is the electron sharing requirement for oxygen in the formation of water (H2O)?
Which statement correctly describes the naming convention of ionic compounds?
Which statement correctly describes the naming convention of ionic compounds?
How should the formula of an ionic compound be structured?
How should the formula of an ionic compound be structured?
What is the primary characteristic of covalent substances?
What is the primary characteristic of covalent substances?
In a dot–and–cross diagram for water, how are electrons represented?
In a dot–and–cross diagram for water, how are electrons represented?
What should be checked to ensure the correctness of a dot–and–cross diagram?
What should be checked to ensure the correctness of a dot–and–cross diagram?
What should you include if a polyatomic ion occurs multiple times in a chemical formula?
What should you include if a polyatomic ion occurs multiple times in a chemical formula?
What is the charge of simple anions derived from non-metals?
What is the charge of simple anions derived from non-metals?
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