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  1. Multiple choice

Write the letter of the word, number, or† phrase that best completes each statement.

    1. The most reliable property used to describe the quantity of matter is a) weight b) volume c) mass† d) density
    2. The heating of sugar produces a chemical change in which two new substances are formed. The new substances are a) syrup and oxygen b) oxygen and carbon c) starch and water d) water and carbon
    3. Chemical changes differ from physical changes because in chemical changers, a) new substances are formed b) properties change c) a change in mass occurs d) less energy change takes place
    4. Two characteristics of† all matter a) has mass and a definite shape b) combines with other matter and has mass c) has mass and occupies space† d) combines with other matter and occupies space
    5. Chemical symbols for the elements are usually restricted to one or two letters. A further restriction is that a) both letters are capitalized b) only the first letter is capitalized c) only the second letter is capitalized d) neither letter can be capitalized
    6. The most abundant element in the earth is a) oxygen b) nitrogen c) silicon d) hydrogen
    7. The total mass of the substances taking part in a chemical chamge is a) always increases b) always decreases c) remains unchanged d) sometimes increases and sometimes decreases
    8. Energy is involved in both physical and chemical changes. The energy in chemical changes compared to physical changes is generally a) greater b) the same c) no difference d) greater in some† but smaller in others
    9. Which of the following† changes would be considered a chemical change?a) rusting of iron b) magnetizing of iron c) melting of iron d) bending of iron
    10. Elements are found in nature a) in a free or elemental state b) combined with other elements c) either free or in a combined state d) only in combined state
    11. The properties of a substance that relate to its ability to form new substances are labeled a) intensive b) extensive c) chemical d) physical
    12. The percentage of oxygen by mass in water is a) greatest when water is a solid b) greatest when water is a liquid c) greatest when water is a vapor
    13. Generally, when a solid substance is heated its volume increases. The effect of increased temperature on the density of the substance then is a) to leave the density unchanged b) to increase the density c) to decrease the density d) impossible to predict
    14. The ratio of the mass of a sample of matter to its volume is itís a) buoyancy b) weight c) density d) specific gravity
    15. all of the following are examples of extensive properties except a) temperature b) volume c) weight d) mass
    16. Properties used to identify substances are usually those that are a) associated with the general properties of all matter b) dependent on the amount of the substance c) independent of the state of matter of that substance d) recognized by direct observation
    17. which of the following groups would include more than one substance? A)elements b) compounds c) mixtures d) none of the above
    18. Any mixture of two substances, such as salt and sugar, would a) have the same properties throughout the mixture b) have to be separated by chemical means c) have new properties different from those of salt and sugar d) retain the properties of the original substances
    19. A compound differs from a mixture in all of the following characteristics except a) the components are chemically combined b) the ratio of the components present is constant c) they can be broken down by chemical means d) the components have different properties than when they are separated
    20. Matter is classified by chemists into three groups-elements, compounds, and mixtures. Which of these categories could be described as only substances? A) elements and compounds b) compounds and mixtures c) elements and mixtures d) all of the above
    21. Which of the following kinds of matter can be either homogeneous or heterogeneous? A) elements b) compounds c) mixtures d) all of the above
    22. The variation of the mass with the volume of a substance is a) directly proportional b) inversely proportional to the volume c) equal to the volume d) unrelated to the volume.
    23. When magnesium burns in air, the magnesium combines with 64 g of oxygen to form 161.2 g of magnesium oxide. How much magnesium is burned in the reaction? A) 40.0 g b) 48.6 g c) 64.0 g d) 97.2 g

Solve the following problems. State a) given b) find c) formula d) substitution e) final answer with the proper units.

    1. What is the mass of a sample of copper whose volume is 2.5 ml? Density of copper is 8.96 grams per ml
    2. What is the density of a metal if a 2.00 cubic cm. Sample of the metal has a mass of 15.8 grams.




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