Jeopardy Game: Changes in Matter
Define a physical change.
A physical change is a change that affects the form of a substance but not its chemical composition.
What is an element?
An element is a pure substance made of only one type of atom.
What is an ionic bond?
An ionic bond is a chemical bond formed when electrons are transferred from one atom to another.
How many atoms of hydrogen are in H₂O?
There are 2 hydrogen atoms in H₂O.
What is an exothermic reaction?
An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat.
State the law of conservation of matter.
The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction.
Define a chemical change.
A chemical change is a change where one or more substances transform into entirely new substances with different properties.
What is a compound?
A compound is a substance made of two or more different elements chemically bonded together.
What is a covalent bond?
A covalent bond is a chemical bond formed when atoms share electrons.
In C₆H₁₂O₆, how many carbon atoms are present?
There are 6 carbon atoms in C₆H₁₂O₆
What is an endothermic reaction?
An endothermic reaction is a chemical reaction that absorbs energy, usually in the form of heat.
In the equation H₂ + O₂ → H₂O, identify the reactants and products.
Give an example of a physical change and a chemical change.
Answer can vary*
What is a mixture?
A mixture is a combination of two or more substances that are not chemically bonded.
Name one difference between ionic and covalent bonds.
Ionic bonds transfer electrons, while covalent bonds share electrons.
How many total atoms are in NH₃ (ammonia)?
NH₃ has 4 atoms (1 nitrogen and 3 hydrogens).
Provide one example of an endothermic reaction.
Photosynthesis is an example of an endothermic reaction.
Balance this equation: CH₄ + O₂ → CO₂ + H₂O.
The balanced equation is CH₄ + 2O₂ → CO₂ + 2H₂O.
What evidence indicates a chemical change has occurred?
Evidence of a chemical change includes color change, gas production, temperature change, or the formation of a precipitate.
Classify the following as elements, compounds, or mixtures: saltwater, oxygen gas, and sugar.
Predict the type of bond that will form between sodium (Na) and chlorine (Cl).
Sodium (Na) and chlorine (Cl) form an ionic bond because sodium is a metal and chlorine is a non-metal.
Identify all elements in NaClO.
NaClO contains sodium (Na), chlorine (Cl), and oxygen (O).
Which reaction absorbs energy: combustion or photosynthesis?
Photosynthesis absorbs energy, while combustion releases energy.
Why is balancing chemical equations important?
Balancing chemical equations is important because it ensures the law of conservation of matter is followed.
A piece of ice melts and then evaporates. Are these physical or chemical changes? Explain.
Melting and evaporating are physical changes because the substance (water) remains the same chemically.
Explain how you would separate a mixture of iron filings and sand.
Use a magnet to separate the iron filings from the sand since iron is magnetic and sand is not.
Describe the properties of substances with covalent bonds.
Substances with covalent bonds often have lower melting and boiling points and are poor conductors of electricity.
Given C₃H₈O, count the number of each type of atom.
Explain the energy transfer in an exothermic reaction like burning wood.
In an exothermic reaction like burning wood, energy is released as heat and light because chemical bonds in the wood are broken and reformed, releasing stored energy.
How does the conservation of matter apply to real-world processes like recycling?
The conservation of matter applies to recycling because materials are not lost but transformed into new products.