This type of system exchanges only energy with the surroundings, not matter.
What is a closed system?
100
This is the solution (coefficients) to H2 + N2 → NH3.
What is 3H2 + N2 → 2NH3?
100
If an element doesn't have a coefficient or a subscript, this is implied.
What is that it is a 1?
100
This is what compounds are made up of.
What are elements?
100
If there are 4 atoms of carbon in the reactants of a chemical equation, there should be this number of atoms in the product.
What is 4 atoms of carbon?
200
This type of system doesn’t exchange energy or matter with surroundings.
What is an isolated system?
200
This is the solution (coefficients) to Cr2O3 + Mg → Cr + MgO.
What is Cr2O3 + 3Mg → 2Cr + 3MgO?
200
This is how many atoms of oxygen are in a molecule of glucose, C6H12O6.
What is 6 atoms of oxygen?
200
This is the only metal that is liquid at room temperature.
What is mercury?
200
This would be the amount of mass in the product of an equation that has 3 grams of carbon, 4 grams of oxygen, & 2 grams of hydrogen.
What is 9 grams?
300
This is best represented by the equation 2Mg + O2 → 2MgO.
What is the Law of Conservation of Mass?
300
This is the solution (coefficients) to Al + O2 → Al2O3.
What is 4Al + 3O2 → 2Al2O3?
300
This is the number and types of atoms that occur in a formula unit of Ca(NO3)2.
What is 1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms?
300
Graphite is made up of this element.
What is carbon?
300
This is how many atoms of each element that are in the equation CH4 +2O2 → CO2 +2H2O.
What is 1 carbon, 4 hydrogen, 4 oxygen?
400
This is how a balanced chemical equation satisfies the Law of Conservation of Mass.
What is that the total amount of matter stays the same?
400
This is the solution (coefficients) to S8 + O2 → SO2.
What is S8 + 8O2 → 8SO2?
400
This must be true if the number of atoms stays the same regardless of how they are arranged.
What is their total mass stays the same?
400
This is how many atoms are in one formula unit of the compound FeC5O5.
What is 11 atoms?
400
40 grams of one chemical and an unknown amount of another chemical are the reactants in a closed system. A chemical reaction occurs and the mass of the products is 120 grams. This is how much of the unknown chemical that was used in the reaction.
What is 80 grams?
500
An experiment was conducted to test the law of conservation of mass. At the end of the experiment, only 90% of the mass of the initial reactants was present. The experiment was repeated three times with similar results. This best explains why some of the mass was lost.
What is the mass escaped as a gas?
500
This is the solution (coefficients) to As4S6 + O2 → As4O6 + SO2.
What is As4S6 + 9O2 → As4O6 + 6SO2?
500
These are the 5 parts of a chemical equation.
What are the reactants, product, yield symbol, coefficients, & subscripts?
500
This is the reason why a subscript can not be changed in a chemical equation.
What is because it would change the molecule or compound to something different?
500
This is what happened to the water in Lavoisier's experiment.
What is the hydrogen was caught in a separate container & the oxygen attached to the iron in the barrel to create rust?