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- 1. Multiple Choice
The diagram above is a model of a molecule of methane. What is the formula for methane?CH8C8H4CH4C8H8 - 2. Multiple Choice2Mg + O2 → 2MgO
In the equation above, how many atoms are in the oxygen molecule?2013 - 3. Multiple ChoiceThe formula below represents the most common carbohydrate known as Glucose. Glucose is synthesized by Chlorophyll in plants as they use carbon dioxide from the air and sunlight as an energy source during the process of photosynthesis.
C6H12O6
What information can be determined from the chemical formula?The structural arrangement of the atoms in a glucose molecule.The color of a glucose molecule.The size of a glucose molecule.The number of atoms of each element in a glucose molecule. - 4. Multiple ChoiceWhich of the following formulas contain the same number of oxygen atoms?
1. Mg(NO)2
2. NH4NO2
3. Ca(ClO2)2
4. Co(NO3)2Formulas 1 and 2Formulas 2 and 4Formulas 1, 2, and 3Formulas 1, 2, and 4 - 5. Multiple ChoiceHow many atoms are in one molecule of baking soda, NaHCO3?4536
- 6. Multiple ChoiceA student placed 2 grams of baking soda in a balloon, and 100 mL of vinegar in a Erlyenmeyer flask. After stretching the balloon across the neck of the flask, the student raised it to drop the baking soda into the flask. He immediately observed foaming bubbles in the flask and the balloon began to expand. The student concluded that -Only a physical change was occuringThe baking soda and vinegar were products of a chemical reactionThe gas was oxygenThe bubbles indicated that a chemical change was occuring
- 7. Multiple ChoiceDuring an investigation, students dropped a tarnished penny into a solution a acetic acid and sodium chloride. Tiny bubbles formed around the penny, and the penny was less tarnished after two minutes of soaking in the acetic acid and sodium chloride solution. The student inferred that a chemical reaction occured. What evidence supports the students' inference?The penny experienced a color change, and a gas was produced.The penny experienced a color change, and a precipitate was formed.The penny experienced a color change and is in a new state of matter.The penny experienced a color change and produced light.
- 8. Multiple ChoiceStudents in a science lab conducted an investigation. Students recored the following observations.
Substance 1 produced light when burned.
Substance 2 dissolved in water.
Substance 3 melted at 100⁰ C.
Substance 4 formed a precipitate.
Which substances produced a chemical change?Substances 1 and 2Substances 1 and 3Substances 1 and 4Substances 2 and 3 - 9. Multiple ChoiceWhich of the following equations follows the law of conservation of mass?3H2O → 3H2 + 3O2C2H4 + 3O2 → 2CO2 + 2H2OC + 4H2 → CH42Na + Cl → NaCl
- 10. Multiple ChoiceHow can a student determine that a chemical reaction demonstrates the law of conservation of mass?Students can compare the products and reactants to determine if the same molecules are present before and after the reaction.Students can compare the products and reactants to determine if the same number of atoms of each element are present before and after the reaction.Students can compare the products and reactants to determine if the same number of molecules are present before and after the reaction.Students can compare the products and reactants to determine if the same elements are present before and after the reaction.
- 11. Multiple ChoiceIn a chemical equation, it is true that -the reactants and products can have different numbers of atoms for each element.there can be different elements on the reactants side and the product side.an element or compound must be accompanied by a phase change.the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made.
- 12. Multiple ChoiceWhat is the correctly balanced chemical equation for the formation of rust, Fe2O3, forming when oxygen, O2 reacts with iron, Fe?O2 + Fe → Fe2O33O2 + 4Fe → 2Fe2O33O2 + 2Fe → 2Fe2O32O2 + 4Fe → 2Fe2O3
- 13. Multiple ChoiceWhat conclusion can you make about the elements shown above?Phosphorus has more valence electrons than nitrogen.Carbon has fewer protons in its nucleus than nitrogen.Phosphorus is more like silicon than it is like nitrogen.Aluminum is smaller than carbon.
- 14. Multiple ChoiceRefer to the Venn diagram above. Which of the following traits do Element I and Element II have in common?The same atomic numberThe same atomic massThe same number of energy levelsThe same number of valence electrons
- 15. Multiple ChoiceRefer to the Venn diagram above. Which of the elements would have the most similar chemical properties as Element I?TantalumScandiumPotassiumStrontium
- 16. Multiple ChoiceWhich of the atom models above represents a stable atom that will not react?Model AModel BModel CModel D
- 17. Multiple ChoiceBased on what you know about the organization of the Periodic Table, which two elements shown above would have the most similar chemical properties?Sodium and MagnesiumPotassium and CalciumPotassium and MagnesiumSodium and Potassium
- 18. Multiple ChoiceThe most reactive metal is one with -4 valence electrons1 valence electron2 valence electrons3 valence electrons
- 19. Multiple ChoiceWhen determining an element's chemical properties, the most important subatomic particle to look at is -protonsvalence electronsneutronspositrons
- 20. Multiple ChoiceIn order to perform an experiment, a chemist needs an element that has similar properties of potassium (K) but has a lower atomic mass. Which element should the chemist select for the experiment?Rubidium (Rb)Sodium (Na)Magnesium (Mg)Calcium (Ca)
- 21. Multiple ChoiceWhich of the following groups in the Periodic Table is made from reactive metals?Group 1Group 6Group 17Group 18
- 22. Multiple ChoiceWhich of the following groups in the Periodic Table is made from non-reactive elements?Group 1Group 4Group 17Group 18
- 23. Multiple ChoiceUsing the Periodic Table, which of the following groups of elements has the smallest atomic number in Period 4?Group 1Group 4Group 17Group 18
- 24. Multiple ChoiceAtoms of which of the following elements have the most similar chemical properties as Cadium (Cd) atoms?Zinc (Zn)Gold (Au)Copper (Cu)Silver (Ag)
- 25. Multiple ChoiceRefer to the image above. Which of these is NOT found in the nucleus of an atom?NeutronsProtonsAtomic massElectrons
- 26. Multiple ChoiceWhich of the atom models above represents a reactive metal?Model AModel BModel CModel D
- 27. Multiple ChoiceWhich of the following is the atomic mass of the atom represented in the above graphic?17 amu16 amu33 amu32 amu
- 28. Multiple ChoiceWhich of the following elements is represented by the above graphic?SulfurChlorineArgonArsenic
- 29. Multiple ChoiceWhich of the following is the atomic number of the atom represented in the above graphic?16171833
- 30. Multiple ChoiceWhich of the following is the number of valence electrons in the atom represented above?161768
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