
Post 9 Weeks Review pt 1
Quiz by Laquetta Allen
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25 questions
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- Q1True/False A compound is a pure substance containing two or more kinds of atoms.TrueFalse30s
- Q2Which equation satisfies the Law of Conservation of Mass?C3H8 + O2 → CO2 + H2OC3H8 + 5O2 → 3CO2 + 4H2OC3H8 + O2 → 3CO2 + 4H2O30s
- Q3How can the element carbon be classified?nonmetalmetalloidmetal30s
- Q4Which best describes the classification of an element that is a shiny solid, conducts electricity, and has an atomic mass of approximately 108?It is a metal.it is a syntheticit is a metalloid30s
- Q5How many protons are in a sodium atom?311130s
- Q6Which demonstrates a chemical change?molten gold freezing to form a ringice melting in a warm sodabreaking a cold pack, causing a sudden drop in temperature30s
- Q7In a chemical reaction, what is the best description of a molecule’s movement when the temperature decreases?movement stays the samemovement increasesmovement decreases30s
- Q8When a marshmallow is toasted over a fire, which is the best description for what happens to the outside of the marshmallow?Physical ChangeChemical ChangeEnzyme Change30s
- Q9Which is the best term to describe a chemical reaction that absorbs heat energy?catalyticendothermicexothermic30s
- Q10Which elements are most likely to react in the same manner in a chemical reaction?elements in the same periodelements with similar atomic masseselements in the same group30s
- Q11Which best explains how elements are arranged on the modern periodic table?Elements are arranged from most protons to fewest protons.Elements are arranged from fewest neutrons to most neutrons.Elements are arranged from fewest protons to most protons.30s
- Q12Which property is unique for each element?atomic numbermass numberstate of matter30s
- Q13What chemical reaction results in the formation of a solid?endothermicprecipitateacid base reaction30s
- Q14Which best represents a balanced equation?Mg(s) + O2(g) ---> 2MgO(s)Mg(s) + 2O2(g) ---> 2MgO(s)2Mg(s) + O2(g) ---> 2MgO(s)30s
- Q15What is the best evidence that a gas has been produced in a chemical reaction?formation of bubbleschange in temperaturechange in color30s