1) Why did the atomic model change over time? a) New discoveries were made over time b) Scientists guess when they make models c) All atomic models have limitations d) They didn't discover something new so they made it more readable e) Art and technology progressed so they had to update the graphics 2) What assumption could be made about the atomic model and it's changes? a) New discoveries weren't made over time b) Scientists guess when they make models c) All atomic models have limitations d) They didn't discover something new so they made it more readable e) Art and technology progressed so they had to update the graphics 3) What is a limitation of the Bohr model of the atom? a) Electrons don't move b) The atom has protons outside of the nucleus c) The atom has neutrons d) Electrons do not have a defined path 4) What does the cloud represent in the electron cloud model? a) The minimum distance the electron is from the nucleus b) The probability of the location of the neutrons c) The location of the protons d) The average distance between the electron and the nucleus e) The probability of the location of the electrons in an atom 5) In Rutherford's gold foil experiment the alpha particles went straight through the foil, what assumption can we make about this? a) Protons can easily pass through gold foil b) Neutrons can pass through gold foil c) An atom is mostly empty space d) The atom doesn't have neutrons 6) After Rutherford's gold foil experiment Chadwick discovered neutrons. How does this demonstrate the nature of science? a) A new scientific law was discovered b) Scientists shared information c) He proved Rutherford's model wrong d) Chadwick's hypothesis was proven wrong 7) After Rutherford's gold foil experiment Chadwick discovered neutrons. How does this demonstrate the nature of science? a) New information was found and changed the way we viewed the atom. b) Rutherford's hypothse was proven wrong c) They discovered a new scientific law d) They found out that the nucleus has protons 8) What is a scientific theory? a) A statement that has not been tested b) Tells us what is happening c) A statement that has been tested and has strong evidence to support it. d) A guess as to what is being observed. 9) Why are theories and laws important in science? a) Theories are just educated guesses b) Theories and laws have evidence to support them c) Theories are untested laws d) Laws are untested theories 10) An explanation of why or how something works or happens in the natural world based on evidence? a) Theory b) Law c) Hypothesis d) question 11) A statement that describes constant observed pattern: sometimes represented as a mathematical equation. a) Theory b) Law c) Hypothesis d) Question 12) A testable prediction based on limited evidence. a) Theory b) Law c) Hypothesis d) Question 13) Which of the following is true about a law? a) It is not based on facts b) They tell why something happens c) They tell what is happening d) They have not been tested 14) Which of the following is true about a law? a) It is not based on facts b) They tell why something happens c) They usually have a mathematical equation d) They have not been tested 15) What is a limitation of the model? a) It doesn't have a nucleus b) It doesn't have protons c) It doesn't have electrons d) It is not to scale, the electrons are too big 16) What subatomic particles contribute to the mass of the atom a) only the neutrons b) only the protons c) only the electrons d) protons and neutrons 17) What is the smallest subatomic particle in the atom a) proton b) neutron c) electron 18) Which subatomic particle(s) are in the nucleus a) neutron and electron b) proton and electron c) proton and neutron d) only electron 19) Which of the following can be broken down into smaller substance without a chemical reaction a) Element b) Compound c) Mixture 20) Which of the following cannot be broken down into smaller substance unless there is a chemical reaction a) Element b) Compound c) Mixture 21) Which of the following cannot be broken down into smaller substance a) Element b) Compound c) Mixture 22) Which can be separated based on physical properties? a) element b) compound c) mixture 23) Which of the following is a compound? a) HCl b) Salt water c) Na d) Na +Cl 24) Which of the following is a element? a) HCl b) Salt water c) Na d) Na +Cl 25) Which of the following is an example of a compound? a) Na b) Na+Cl c) NH4 d) Air 26) What is a substance made up of one type of atom? a) element b) compound c) Mixture 27) This is a picture of a) element b) compound c) mixture 28) This is a picture of  a) element b) compound c) mixture 29) This is a picture of  a) element b) compound c) mixture 30) This is a picture of  a) element b) compound c) mixture 31) This is a picture of  a) element b) compound c) mixture 32) What is the first the first thing you should do in a lab a) Put on Googles and Safety Equipment b) Gather your materials c) Do the first step of the method d) Form a hypothesis

Unit 2 Review

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