Science Speak
These starting substances belong on the left side of a chemical equation
What are reactants?
C₆H₈O₇ + 3NaHCO₃ → Na₃C₆H₅O₇ + 3CO₂ + 3H₂O
Citric acid + baking soda → sodium citrate + carbon dioxide + water
Name the two reactants in the bath bomb equation.
What are citric acid and baking soda?
A pot of water boils. Name the gas that forms.
What is water vapor?
A liquid has a mass of 18 g and a volume of 9 mL. Calculate its density, including units.
What is 2 g/mL?
Which CER part is this sentence? “A chemical reaction happened and produced oxygen.”
What is the claim?
These substances form during a reaction and appear on the right side of the equation.
What are products?
C₆H₈O₇ + 3NaHCO₃ → Na₃C₆H₅O₇ + 3CO₂ + 3H₂O
Citric acid + baking soda → sodium citrate + carbon dioxide + water
Name the three products in the bath bomb equation.
What are sodium citrate, carbon dioxide, and water?
Electricity splits water into these two gases.
What is hydrogen and oxygen gas?
A sealed bottle and its contents have a mass of 150 g. A reaction forms gas inside it. What is the total mass afterward?
What is 150 g?
Which CER part is this sentence? “The mixture got warmer, and the gas relit a glowing splint.”
What is the evidence?
A change in size, shape, or state that keeps the same substance has this name.
What is a physical change?
C₆H₈O₇ + 3NaHCO₃ → Na₃C₆H₅O₇ + 3CO₂ + 3H₂O
What is the citric acid to baking soda particle ratio? How many baking soda formula units react with 2 citric acid molecules?
What is 1:3, and 6 baking soda formula units?
A silver trophy develops a black coating after reacting with sulfur compounds in the air. Classify the change and explain.
What is a chemical change and a new substance forms on the silver's surface?
Two reactants have masses of 30 g and 20 g. All products stay in the closed system. What is the total mass of the products?
What is 50 g?
Which CER part connects evidence to a claim using science ideas?
What is reasoning?
Name the process in which atoms rearrange to form new substances. What kind of change does it cause?
What is a chemical reaction that causes a chemical change?
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + released energy
A cheetah's cells use this reaction for speeding up to hunt their prey. For 1 glucose molecule, how many O₂ molecules react and how many CO₂ molecules form? What does the small ₂ in O₂ mean?
What are 6 O₂ molecules and 6 CO₂ molecules? Each O₂ molecule contains 2 oxygen atoms.
Gas from boiling water cools into liquid. The liquid's density matches water at the same temperature. What does this support about the gas?
What is evidence that it was water vapor?
An open elephant toothpaste setup has a measured mass of 100 g before reacting and 96 g afterward. Only gas leaves. How much gas escaped, and did matter disappear?
What is 4 g of gas escaped? Matter did not disappear.
A student says, “Bubbles prove a chemical reaction because all chemical reactions make bubbles.” Give TWO reasons this argument is weak.
What are: physical changes can make bubbles, and some chemical reactions make no gas bubbles?
This property measures mass per unit of volume. Give its name AND equation.
What is density? Density= mass/volume.
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + released energy
Count ALL oxygen atoms on each side of this reaction. Explain why the totals match.
What are 18 oxygen atoms on each side?
Why is splitting water with electricity a chemical change, while boiling water is a physical change?
What is new substances forming during electrolysis, while boiling keeps the same H₂O molecules?
Liquid A: 20 g in 10 mL. Liquid B: 15 g in 5 mL. Which is denser? Show both densities.
What is liquid B? A = 2 g/mL. B = 3 g/mL.
Elephant toothpaste makes foam and gets warmer. Its gas relights a glowing splint. Strengthen the claim that a chemical reaction produced oxygen using the best evidence AND atom reasoning.
What is: The gas relit a glowing splint, supporting its identity as oxygen. Hydrogen peroxide's atoms rearranged into water and oxygen, forming new substances?