Loading
by BlastRoom
Balance chemical equations and read what the coefficients and subscripts say about the atoms taking part in a reaction.
#us_grade_8_science
40 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
Answer to place stones and capture territory.
Outrun the snow together.
Earn blasts, then hunt the other team.
Answer to earn energy, then climb.
The class blasts through walls together.
Bid on mystery lots. Most money wins.
Sell tours. Nice, standard, or a total scam.
Answer, restock, and serve the rush.
More correct answers pulls the rope your way.
Answer, then shoot down the alien wave.
Answer, then tap to leap the frozen ridge.
Methane burns in oxygen to form carbon dioxide and water. Which equation for this reaction has the same number of each kind of atom on both sides?
Nitrogen gas and hydrogen gas combine to make ammonia. Which equation for this reaction has equal numbers of nitrogen and hydrogen atoms on both sides?
Hydrogen peroxide breaks down into water and oxygen gas. Which equation for this decomposition has the same number of each kind of atom on both sides?
Carbon monoxide burns in oxygen to form carbon dioxide. Which equation for this reaction is balanced?
Zinc metal dropped into hydrochloric acid fizzes, forming zinc chloride and hydrogen gas. Which equation for this reaction is balanced?
Silver nitrate solution mixed with sodium chloride solution makes a white silver chloride precipitate and sodium nitrate. Which equation for this reaction is balanced?
A magnesium ribbon burns in air with a bright white flame, forming magnesium oxide. Which equation for this reaction is balanced?
Sodium metal reacts with chlorine gas to make sodium chloride, the salt used in food. Which equation for this reaction is balanced?
An electric current passed through water splits it into hydrogen gas and oxygen gas. Which equation for this decomposition is balanced?
Aluminum foil left in air slowly forms a coating of aluminum oxide, Al2O3. Which equation for this reaction is balanced?
Calcium chloride solution and sodium carbonate solution form a chalky calcium carbonate precipitate plus sodium chloride. Which equation for this reaction is balanced?
A copper wire left in silver nitrate solution becomes coated with gray silver, and copper nitrate forms. Which equation for this reaction is balanced?
The equation ___ H2 + O2 gives 2 H2O is missing one number. Which coefficient belongs in the blank so that each kind of atom is equal on both sides?
Potassium chlorate decomposes when heated: 2 KClO3 gives 2 KCl + ___ O2. Which coefficient makes the oxygen atoms equal on both sides?
A student is balancing ___ Al + 3 Cl2 gives 2 AlCl3. What number goes in the blank so that each element has the same atom count on both sides?
Magnesium reacts with hydrochloric acid: Mg + ___ HCl gives MgCl2 + H2. Which coefficient balances the equation?
Propane burns in a camping stove: C3H8 + ___ O2 gives 3 CO2 + 4 H2O. Which coefficient makes the oxygen atoms equal on both sides?
Lead nitrate and potassium iodide react: Pb(NO3)2 + 2 KI gives PbI2 + ___ KNO3. Which coefficient completes the equation?
Ethene burns in oxygen: C2H4 + ___ O2 gives 2 CO2 + 2 H2O. Which coefficient makes the oxygen atoms match on both sides?
Aluminum displaces copper from copper sulfate: 2 Al + 3 CuSO4 gives Al2(SO4)3 + ___ Cu. Which coefficient balances the copper atoms?
Hydrogen sulfide burns in air: 2 H2S + ___ O2 gives 2 SO2 + 2 H2O. Which coefficient makes each kind of atom equal on both sides?
Baking soda decomposes on heating: ___ NaHCO3 gives Na2CO3 + H2O + CO2. Which coefficient belongs in the blank so the atoms balance?
Lightning makes nitrogen and oxygen in air combine: N2 + O2 gives ___ NO. Which coefficient makes each kind of atom equal on both sides?
Iron rusts in damp air: ___ Fe + 3 O2 gives 2 Fe2O3. Which coefficient belongs in the blank?
An equation includes the term 2 Al2(SO4)3 on the left of the arrow. How many oxygen atoms does that term represent?
An equation includes the term 4 H2O. How many hydrogen atoms does that term represent?
A respiration equation includes the term 2 C6H12O6. How many carbon atoms does that term represent?
An equation includes the term 3 Mg(OH)2. How many hydrogen atoms does that term represent?
An equation includes the term 2 NH3 among the products. How many atoms in total does that term represent?
An equation includes the term 2 KClO3. How many oxygen atoms does that term represent?
Look at the equation CH4 + 2 O2 gives CO2 + 2 H2O. How many oxygen atoms are on the reactant side of the arrow?
In the equation H2 + Cl2 gives 2 HCl, each side of the arrow has two hydrogen atoms and two chlorine atoms.
A student balancing N2 + H2 gives NH3 rewrites the product NH3 as NH2 so the hydrogen atoms match. What is wrong with this move?
In the term 2 H2O, what does the 2 written in front of the formula tell you?
In the balanced equation 2 H2 + O2 gives 2 H2O, 4 grams of hydrogen react completely with 32 grams of oxygen. What mass of water forms?
A sealed flask holds 10 grams of baking soda and 40 grams of vinegar. They react and fill the flask with gas. What do the contents of the sealed flask weigh afterward?
One student writes 3 H2O and another writes H6O3. Why do these not mean the same thing?
In the equation CH4 + 2 O2 gives CO2 + 2 H2O, if 5 methane molecules burn completely, how many oxygen molecules are used?
In a balanced chemical equation, every element has the same number of atoms on the reactant side as on the product side.
When a log burns in an open fireplace, the ash weighs less than the log did, so some atoms were destroyed by the fire.
Crack the passcode before the zombies get in.
Answer, then swat bugs for bonus points.
Race through questions at your own speed.
Same question on every screen. Fastest wins.
Pick a tile, answer, hit bonuses and steals.
Particle Motion and States of Matter
40 questions
