Chemistry Test 2
Quiz by Heather
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22 questions
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- Q1When two or more substances combine, but each keeps its own properties, the new combination is called a(an)Homogenous substanceelementMixtureCompound30s
- Q2Which of these substances is the strongest acid?Lemon juice pH 2Bleach pH 10NaOH pH 13Blood pH830s
- Q3Which is the strongest base?HCl pH 1Blood pH 8Saliva pH 6NaOH Ph 1330s
- Q4Which is an example of a chemical reaction?rusting ironwater evaporatingrubbing a marker on papermelting ice30s
- Q5Which is a balanced equation?2Na + Cl2 --> NaCl2Na + Cl2 --> 2NaCl2Na + 2Cl2 --> 2NaClNa + Cl2 --> NaCl60s
- Q6reactants → products Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.The mass of the reactants is less than the mass of the products.The mass of the products is always greater than the mass of the reactants.The mass of the reactants is greater than the mass of the products.The mass of the reactants equals the mass of the products.45s
- Q7A + B + C → D + E Describe the mass of the reactants and products given the balanced chemical reaction.The mass of the reactants equals the mass of the products.The mass of the products is 2/3 that of the reactants.The mass of the reactants is greater than the mass of the products.The mass of the reactants is less than the mass of the products.45s
- Q8Which is an example of a physical property?Reactivity with waterpHFreezing PointFlammability30s
- Q9Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The pack began to get icy cold and Carla applied the pack to Maria's ankle. What kind of reaction occurred in the cold pack? What evidence supports your answer?It is a chemical change because two different chemicals are mixed together.It is a chemical change because heat energy is absorbed and the pack gets colder.It is a physical change because the substance in the vial dissolved in the pack's liquid.It is a physical change as evidenced by a drop in temperature.45s
- Q10Elements are composed ofthe same type of atom.many different compounds.the same type of compound.many types of atoms.45s
- Q11One difference between mixtures and pure substances is thatpure substances have no chemical bonds.mixtures are made of one type of atom.mixtures can be physically separated.pure substances can be physically separated.45s
- Q12Suppose you have a container filled with iron and sand. You can separate the iron from the sand if you ____________ so this is a _________.use a magnet; mixture.dissolve the sand in water; solution.add baking soda; chemical compound.melt the sand; mixture.45s
- Q13Which is a physical property of matter?flammabilitycorrosionoxidationvolume45s
- Q14Most metals are solid at room temperature, malleable, ductile, good conductors of heat and electricity, and react in acids to produce hydrogen gas. Which of the properties mentioned is a chemical property?solid at room temperatureare malleableare good conductors of heatreacts with acids45s
- Q15Which is a physical change?cooking an eggrusting metalburning woodfreezing water45s