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13,700 | NDQ_015464 | classes of elements | only nonmetal that is a liquid at room temperature | null | null | Multiple Choice | a. metals, b. metalloids, c. nonmetals, d. mercury, e. ductile, f. bromine, g. brittle | f |
13,701 | NDQ_015465 | classes of elements | Nonmetals are the second largest class of elements. | null | null | Multiple Choice | a. true, b. false | a |
13,702 | NDQ_015466 | classes of elements | word that describes most metals | null | null | Multiple Choice | a. metals, b. metalloids, c. nonmetals, d. mercury, e. ductile, f. bromine, g. brittle | e |
13,703 | NDQ_015467 | classes of elements | only metal that is a liquid at room temperature | null | null | Multiple Choice | a. metals, b. metalloids, c. nonmetals, d. mercury, e. ductile, f. bromine, g. brittle | d |
13,704 | NDQ_015468 | classes of elements | Elements with eight valence electron are unreactive. | null | null | Multiple Choice | a. true, b. false | a |
13,705 | NDQ_015469 | classes of elements | class of elements that conduct electricity | null | null | Multiple Choice | a. metals, b. metalloids, c. nonmetals, d. mercury, e. ductile, f. bromine, g. brittle | a |
13,706 | NDQ_015470 | classes of elements | Fluorine is an example of a metalloid. | null | null | Multiple Choice | a. true, b. false | b |
13,707 | NDQ_015471 | classes of elements | Nonmetals tend to give up electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,708 | NDQ_015479 | classes of elements | Metals have relatively high melting points. | null | null | Multiple Choice | a. true, b. false | a |
13,709 | NDQ_015480 | classes of elements | Carbon is an example of a metalloid. | null | null | Multiple Choice | a. true, b. false | b |
13,710 | NDQ_015481 | classes of elements | Almost all nonmetals are solids are room temperature. | null | null | Multiple Choice | a. true, b. false | b |
13,711 | NDQ_015482 | classes of elements | Some nonmetals are semiconductors. | null | null | Multiple Choice | a. true, b. false | b |
13,712 | NDQ_015483 | classes of elements | Silicon is the most common metalloid on Earth. | null | null | Multiple Choice | a. true, b. false | a |
13,713 | NDQ_015484 | classes of elements | Metals generally have fewer valence electrons than nonmetals. | null | null | Multiple Choice | a. true, b. false | a |
13,714 | NDQ_015485 | classes of elements | The number of valence electrons determines an elements reactivity. | null | null | Multiple Choice | a. true, b. false | a |
13,715 | NDQ_015486 | classes of elements | Elements that want to gain electrons are usually metals. | null | null | Multiple Choice | a. true, b. false | b |
13,716 | NDQ_015487 | classes of elements | The ability of an element to conduct electricity depends on its number of neutrons. | null | null | Multiple Choice | a. true, b. false | b |
13,717 | NDQ_015488 | classes of elements | Neon is more reactive than fluorine. | null | null | Multiple Choice | a. true, b. false | b |
13,718 | NDQ_015489 | groups of elements | column of elements in the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | f |
13,719 | NDQ_015490 | groups of elements | Hydrogen is in the same group as the alkali metals because | null | null | Multiple Choice | a. it is a metal., b. it is unreactive., c. it has one valence electron., d. it is in period 1 of the periodic table. | c |
13,720 | NDQ_015491 | groups of elements | element in group 18 of the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | d |
13,721 | NDQ_015492 | groups of elements | Alkaline Earth metals are less reactive than | null | null | Multiple Choice | a. noble gases., b. transition metals., c. alkali metals., d. all of the above | c |
13,722 | NDQ_015493 | groups of elements | metal in group 1 of the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | a |
13,723 | NDQ_015494 | groups of elements | Which groups of the periodic table contain one or more metalloids? | null | null | Multiple Choice | a. groups 12, b. groups 312, c. groups 1316, d. groups 1718 | c |
13,724 | NDQ_015495 | groups of elements | The most reactive nonmetals are elements in the | null | null | Multiple Choice | a. boron group., b. nitrogen group., c. oxygen group., d. halogen group. | d |
13,725 | NDQ_015496 | groups of elements | radioactive transition metal | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | g |
13,726 | NDQ_015497 | groups of elements | metal in group 2 of the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | b |
13,727 | NDQ_015498 | groups of elements | All elements in the carbon group | null | null | Multiple Choice | a. are solids are room temperature., b. have four valence electrons., c. are not very reactive., d. all of the above | d |
13,728 | NDQ_015500 | groups of elements | metal in group 3 of the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | e |
13,729 | NDQ_015501 | groups of elements | nonmetal in group 17 of the periodic table | null | null | Multiple Choice | a. alkali metal, b. alkaline Earth metal, c. halogen, d. noble gas, e. transition metal, f. group, g. actinide | c |
13,730 | NDQ_015503 | groups of elements | Elements in group 1 include | null | null | Multiple Choice | a. hydrogen., b. alkali metals., c. alkaline Earth metals., d. two of the above | d |
13,731 | NDQ_015506 | groups of elements | Alkali metals are | null | null | Multiple Choice | a. soft., b. high in density., c. not very reactive., d. all of the above | a |
13,732 | NDQ_015508 | groups of elements | Which statement about alkaline Earth metals is true? | null | null | Multiple Choice | a. They are more reactive than alkali metals., b. They are always found combined with other elements., c. Some of them are liquids at room temperature., d. They are all gold in color. | b |
13,733 | NDQ_015509 | groups of elements | The most reactive metals are the transition metals. | null | null | Multiple Choice | a. true, b. false | b |
13,734 | NDQ_015510 | groups of elements | Transition metals tend to | null | null | Multiple Choice | a. be shiny., b. boil at low temperatures., c. be very soft., d. be extremely reactive. | a |
13,735 | NDQ_015511 | groups of elements | Alkaline Earth metals have three valence electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,736 | NDQ_015512 | groups of elements | The only nonmetal in the carbon group is | null | null | Multiple Choice | a. nitrogen., b. boron., c. carbon., d. oxygen. | c |
13,737 | NDQ_015513 | groups of elements | Halogens form salts when they combine with | null | null | Multiple Choice | a. alkali metals., b. alkaline Earth metals., c. transition metals., d. all metals. | a |
13,738 | NDQ_015514 | groups of elements | Mercury is the only metal that is a liquid at room temperature. | null | null | Multiple Choice | a. true, b. false | a |
13,739 | NDQ_015515 | groups of elements | Nobles gases are | null | null | Multiple Choice | a. colorless., b. odorless., c. reactive., d. two of the above | d |
13,740 | NDQ_015516 | groups of elements | Boron is an example of an element in the metalloids class. | null | null | Multiple Choice | a. true, b. false | a |
13,741 | NDQ_015517 | groups of elements | Helium is an element in the group called the halogens. | null | null | Multiple Choice | a. true, b. false | b |
13,742 | NDQ_015518 | groups of elements | Hydrogen is an alkali metal. | null | null | Multiple Choice | a. true, b. false | b |
13,743 | NDQ_015519 | groups of elements | Alkali metals are found only in compounds. | null | null | Multiple Choice | a. true, b. false | a |
13,744 | NDQ_015520 | groups of elements | Some alkali metals can float on water. | null | null | Multiple Choice | a. true, b. false | a |
13,745 | NDQ_015521 | groups of elements | Calcium is an alkali metal. | null | null | Multiple Choice | a. true, b. false | b |
13,746 | NDQ_015522 | groups of elements | There is just one group of transition metals. | null | null | Multiple Choice | a. true, b. false | b |
13,747 | NDQ_015523 | groups of elements | Many of the actinides do not occur in nature. | null | null | Multiple Choice | a. true, b. false | a |
13,748 | NDQ_015524 | groups of elements | Elements in the oxygen group have eight valence electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,749 | NDQ_015525 | groups of elements | Selenium is an alkaline Earth metal. | null | null | Multiple Choice | a. true, b. false | b |
13,750 | NDQ_015526 | groups of elements | The halogen group includes only gases. | null | null | Multiple Choice | a. true, b. false | b |
13,751 | NDQ_015527 | groups of elements | Noble gases are found only in combination with other elements. | null | null | Multiple Choice | a. true, b. false | b |
13,752 | NDQ_015535 | introduction to chemical bonds | Subscripts in a chemical formula are used to show the number of | null | null | Multiple Choice | a. molecules in a substance., b. atoms of each element in a compound., c. different elements in a compound., d. protons in an element. | b |
13,753 | NDQ_015536 | introduction to chemical bonds | There are millions of unique substances in the universe because elements can combine in many different ways to form | null | null | Multiple Choice | a. mixtures., b. solutions., c. compounds., d. ions. | c |
13,754 | NDQ_015537 | introduction to chemical bonds | Which chemical formula represents the compound hydrogen peroxide? | null | null | Multiple Choice | a. H2 O, b. HO2, c. H2 O 2, d. H2 O 3 | c |
13,755 | NDQ_015538 | introduction to chemical bonds | Water is an example of a(n) | null | null | Multiple Choice | a. unique substance., b. chemical compound., c. covalent compound., d. all of the above | d |
13,756 | NDQ_015539 | introduction to chemical bonds | The chemical formula HCl represents the compound named | null | null | Multiple Choice | a. hydrogen chloride., b. hydrogen carbide., c. methane., d. none of the above | a |
13,757 | NDQ_015540 | introduction to chemical bonds | Which statement is true about water and hydrogen peroxide? | null | null | Multiple Choice | a. Both substances have the same properties., b. Both substances have the same chemical formula., c. Both substances consist of hydrogen and oxygen., d. Both substances are mixtures of elements. | c |
13,758 | NDQ_015541 | introduction to chemical bonds | Chemical bonds always involve | null | null | Multiple Choice | a. ions., b. atoms., c. metals., d. electrons. | d |
13,759 | NDQ_015542 | introduction to chemical bonds | Which statement is true about carbon dioxide and carbon monoxide? | null | null | Multiple Choice | a. Both compounds consist of carbon and oxygen., b. Both compounds have all the same properties., c. Both compounds are harmless gases., d. all of the above | a |
13,760 | NDQ_015543 | introduction to chemical bonds | How many valence electrons does an oxygen atom have? | null | null | Multiple Choice | a. 2, b. 4, c. 6, d. 8 | c |
13,761 | NDQ_015544 | introduction to chemical bonds | The ratio of elements in a given compound | null | null | Multiple Choice | a. is always 2 to 1., b. is always the same., c. may vary., d. two of the above | b |
13,762 | NDQ_015546 | introduction to chemical bonds | A given compound always has the same | null | null | Multiple Choice | a. chemical formula., b. composition., c. volume., d. two of the above | d |
13,763 | NDQ_015547 | introduction to chemical bonds | When there is just one atom of an element in a molecule, what subscript is used for the element? | null | null | Multiple Choice | a. 1, b. 0, c. 2, d. No subscript is used. | d |
13,764 | NDQ_015555 | introduction to chemical bonds | An oxygen atom has eight valence electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,765 | NDQ_015557 | introduction to chemical bonds | A molecule of carbon monoxide has two carbon atoms and one oxygen atom. | null | null | Multiple Choice | a. true, b. false | b |
13,766 | NDQ_015560 | introduction to chemical bonds | The types of bonds in chemical compounds determine many of their properties. | null | null | Multiple Choice | a. true, b. false | a |
13,767 | NDQ_015562 | introduction to chemical bonds | The same elements may form different compounds. | null | null | Multiple Choice | a. true, b. false | a |
13,768 | NDQ_015563 | introduction to chemical bonds | The chemical formula for carbon dioxide is CO2 . | null | null | Multiple Choice | a. true, b. false | a |
13,769 | NDQ_015564 | introduction to chemical bonds | A hydrogen atom has two electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,770 | NDQ_015565 | introduction to chemical bonds | Each element is represented by a unique chemical formula. | null | null | Multiple Choice | a. true, b. false | b |
13,771 | NDQ_015566 | introduction to chemical bonds | The compound carbon dioxide has twice as many oxygen atoms as carbon atoms. | null | null | Multiple Choice | a. true, b. false | a |
13,772 | NDQ_015567 | introduction to chemical bonds | The same elements may combine in different ratios to form the same compound. | null | null | Multiple Choice | a. true, b. false | b |
13,773 | NDQ_015568 | introduction to chemical bonds | Any molecule that contains only hydrogen and oxygen is water. | null | null | Multiple Choice | a. true, b. false | b |
13,774 | NDQ_015569 | introduction to chemical bonds | Different types of compounds differ in the types of bonds that hold their atoms together. | null | null | Multiple Choice | a. true, b. false | a |
13,775 | NDQ_015570 | introduction to chemical bonds | Both coal and diamond consist of atoms of carbon that are bonded together. | null | null | Multiple Choice | a. true, b. false | a |
13,776 | NDQ_015571 | introduction to chemical bonds | Most of the unique substances on Earth are compounds. | null | null | Multiple Choice | a. true, b. false | a |
13,777 | NDQ_015572 | introduction to chemical bonds | When atoms combine chemically they form mixtures. | null | null | Multiple Choice | a. true, b. false | b |
13,778 | NDQ_015573 | introduction to chemical bonds | A chemical bond consists of matter that connects two different atoms. | null | null | Multiple Choice | a. true, b. false | b |
13,779 | NDQ_015574 | introduction to chemical bonds | pure substance that cannot be separated into any other substances | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | e |
13,780 | NDQ_015575 | introduction to chemical bonds | unique substance that forms when elements combine chemically | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | c |
13,781 | NDQ_015576 | introduction to chemical bonds | particle of a compound that forms when atoms bond together | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | f |
13,782 | NDQ_015577 | introduction to chemical bonds | one of three types of chemical compounds | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | g |
13,783 | NDQ_015578 | introduction to chemical bonds | symbol representing a chemical compound | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | b |
13,784 | NDQ_015579 | introduction to chemical bonds | particle in the outer energy level of an atom | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | d |
13,785 | NDQ_015580 | introduction to chemical bonds | force of attraction between atoms or ions that share or transfer electrons | null | null | Multiple Choice | a. chemical bond, b. chemical formula, c. compound, d. valence electron, e. element, f. molecule, g. ionic | a |
13,786 | NDQ_015581 | ionic bonds | Ionic compounds form when ions share electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,787 | NDQ_015582 | ionic bonds | When halogens form ions they | null | null | Multiple Choice | a. become positive in charge., b. become negative in charge., c. gain two electrons., d. two of the above | b |
13,788 | NDQ_015583 | ionic bonds | In sodium chloride, sodium loses an electron to chlorine. | null | null | Multiple Choice | a. true, b. false | a |
13,789 | NDQ_015584 | ionic bonds | Which two elements would not form ionic bonds? | null | null | Multiple Choice | a. calcium and lithium, b. calcium and oxygen, c. lithium and oxygen, d. calcium and carbon | a |
13,790 | NDQ_015585 | ionic bonds | Ionic bonds form only between atoms of nonmetals. | null | null | Multiple Choice | a. true, b. false | b |
13,791 | NDQ_015586 | ionic bonds | Energy is released when | null | null | Multiple Choice | a. valence electrons are removed from an atom., b. valence electrons are gained by an atom., c. a positive ion forms., d. two of the above | b |
13,792 | NDQ_015587 | ionic bonds | A sodium ion has a charge of | null | null | Multiple Choice | a. -1, b. -2, c. +1, d. +2 | c |
13,793 | NDQ_015588 | ionic bonds | The amount of energy needed to form an ion depends only on the number of valence electrons. | null | null | Multiple Choice | a. true, b. false | b |
13,794 | NDQ_015589 | ionic bonds | Francium has the same number of valence electrons as lithium. | null | null | Multiple Choice | a. true, b. false | a |
13,795 | NDQ_015590 | ionic bonds | In a given metals group of the periodic table, compared with elements closer to the top of the table, elements closer to the bottom | null | null | Multiple Choice | a. have valence electrons that are farther from the nucleus., b. have valence electrons that are harder to remove from the atom., c. need more energy to form positive ions., d. all of the above | a |
13,796 | NDQ_015592 | ionic bonds | Alkali metals release the most energy when they become ions. | null | null | Multiple Choice | a. true, b. false | b |
13,797 | NDQ_015593 | ionic bonds | Salt consists of molecules of sodium and chloride ions. | null | null | Multiple Choice | a. true, b. false | b |
13,798 | NDQ_015595 | ionic bonds | When an atom of iodine becomes an ion, it is named iodide. | null | null | Multiple Choice | a. true, b. false | a |
13,799 | NDQ_015598 | ionic bonds | Ionic compounds are usually liquids at room temperature. | null | null | Multiple Choice | a. true, b. false | b |
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