Chemistry Semester 1 Final Flashcards
A technique that uses a porous barrier to separate heterogeneous mixture is _______
Flirtation
Technique that uses the differences in boiling point to separate homogeneous mixtures is_________
Distillation
Which of the following is a pure substance? Sugar in water Gun powder Steam Soda
Steam
A Vapor is a _____
Gas
How can the law of conservation of mass apply to a Burning log if all that remains of it is ash?
Masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning
Which of the following is a vapor?
Steam
Which of the following is a heterogeneous mixture?
Samples of nitrogen and oxygen in the same container
Sugar
Samples of argon and iron in the same container
Milk you buy at the store
Samples of argon and iron in the same container
How can you tell when following reaction is balanced? 2Cu + O2-> 2CuO Mass of reactants = volume of products Volume of reactants = mass of products Mass of reactants = mass of products Volume of reactants = volume of products
Mass of reactants = mass of products
Periods are______on the periodic table
Horizontal rows
The statement, “mass can neither be created nor destroyed in a chemical reaction” is the _______
Law of conservation of mass
Which of the following is a compound? Neon Water Steel Crude oil
Water
Sucrose is composed of carbon, hydrogen, and oxygen. Which of the following data is not needed in order to determine the percent by mass of the three Elments? Mass of carbon in sucrose sample Total mass of the sucrose sample Atomic numbers of the elements Mass of hydrogen in sucrose sample
Atomic numbers of the elements
A characteristic that can be observed or measured without changing the samples chemical composition is _______
A physical property
Properties that are dependent on the amount of a substance present are:
Extensive property
Matter that has a uniform and unchanging composition is a _______
Substance
