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14,300 | NDQ_016499 | chemical formula | correct rules for writing the chemical formulas of covalent compounds include which of the following? | null | null | Multiple Choice | a. The element that is farther to the left in the periodic table is written first., b. The element that is farther to the right in the periodic table is written first., c. If both elements are in the same group of the periodic table, the one with the lower period number is written first., d. two of the above | a |
14,301 | NDQ_016500 | chemical formula | the chemical formula for the compound that consists of barium ions (ba+2) and oxide ions (o-2) is | null | null | Multiple Choice | a. OBa., b. O2Ba2., c. Ba2O2., d. BaO. | d |
14,302 | NDQ_016512 | chemical reaction overview | a chemical reaction changes some substances into other substances with different chemical properties. | null | null | Multiple Choice | a. true, b. false | a |
14,303 | NDQ_016515 | chemical reaction overview | the substances involved in a chemical reaction may be elements or compounds. | null | null | Multiple Choice | a. true, b. false | a |
14,304 | NDQ_016517 | chemical reaction overview | during a chemical reaction | null | null | Multiple Choice | a. chemical bonds break., b. matter is destroyed., c. new atoms form., d. two of the above | a |
14,305 | NDQ_016518 | chemical reaction overview | which of the following represents a synthesis reaction? | null | null | Multiple Choice | a. 2H2 + O2 → 2H2O, b. 2K + 2H2O → 2KOH + H2, c. 2NaCl → 2Na + Cl2, d. none of the above | a |
14,306 | NDQ_016519 | chemical reaction overview | which type of reaction is represented by the following chemical equation? ch4 + 2o2 co2 + 2h2o | null | null | Multiple Choice | a. combustion reaction, b. decomposition reaction, c. single replacement reaction, d. double replacement reaction | a |
14,307 | NDQ_016523 | chemical reaction rate | factors that affect the rate of a chemical reaction include | null | null | Multiple Choice | a. concentration of reactants., b. surface area of reactants., c. temperature of reactants., d. all of the above | d |
14,308 | NDQ_016524 | chemical reaction rate | warmer reactants react more quickly than cooler reactants. | null | null | Multiple Choice | a. true, b. false | a |
14,309 | NDQ_016529 | chemical reaction rate | food spoils faster at higher temperatures because heat is a catalyst. | null | null | Multiple Choice | a. true, b. false | b |
14,310 | NDQ_016530 | chemical reaction rate | which statement is true about any catalyst? | null | null | Multiple Choice | a. It is a reactant in a chemical reaction., b. It is used up in a chemical reaction., c. It can speed up many chemical reactions., d. all of the above | c |
14,311 | NDQ_016531 | chemical reaction rate | warmer reactants have more energy and move faster. | null | null | Multiple Choice | a. true, b. false | a |
14,312 | NDQ_016535 | chemistry of compounds | all compounds consist of a fixed ratio of elements. | null | null | Multiple Choice | a. true, b. false | a |
14,313 | NDQ_016538 | chemistry of compounds | covalent compounds are compounds that | null | null | Multiple Choice | a. consist only of nonmetallic elements., b. have atoms that share electrons., c. exist as individual molecules., d. all of the above | d |
14,314 | NDQ_016539 | chemistry of compounds | water is an example of a covalent compound. | null | null | Multiple Choice | a. true, b. false | a |
14,315 | NDQ_016540 | chemistry of compounds | ionic compounds are compounds that | null | null | Multiple Choice | a. consist only of metallic elements., b. have atoms that transfer electrons., c. exist as individual ions., d. all of the above | b |
14,316 | NDQ_016541 | chemistry of compounds | carbon dioxide is an example of an ionic compound. | null | null | Multiple Choice | a. true, b. false | b |
14,317 | NDQ_016542 | color | a rainbow includes all the colors of visible light. | null | null | Multiple Choice | a. true, b. false | a |
14,318 | NDQ_016543 | color | visible light includes all the wavelengths of light that the human eye can detect. | null | null | Multiple Choice | a. true, b. false | a |
14,319 | NDQ_016548 | color | leaves appear green because they | null | null | Multiple Choice | a. absorb only green light., b. reflect only green light., c. transmit only green light., d. none of the above | b |
14,320 | NDQ_016549 | color | if only blue light strikes green leaves, the leaves appear | null | null | Multiple Choice | a. green., b. blue., c. black., d. white. | c |
14,321 | NDQ_016550 | color | primary colors of light include | null | null | Multiple Choice | a. red., b. cyan., c. magenta., d. all of the above | a |
14,322 | NDQ_016551 | color | primary colors of pigments include | null | null | Multiple Choice | a. yellow., b. blue., c. green., d. none of the above | a |
14,323 | NDQ_016555 | combining forces | the net force acting on you when you sit still in a chair is zero. | null | null | Multiple Choice | a. true, b. false | a |
14,324 | NDQ_016556 | combining forces | when two forces act on an object in opposite directions, you calculate the net force by | null | null | Multiple Choice | a. dividing the two forces., b. subtracting the two forces., c. finding the average of the two forces., d. none of the above | b |
14,325 | NDQ_016557 | combining forces | when two forces act on an object in the same direction, you calculate the net force by | null | null | Multiple Choice | a. adding the two forces., b. multiplying the two forces., c. finding the larger of the two forces., d. none of the above | a |
14,326 | NDQ_016559 | combining forces | when two forces act on the same object in opposite directions, the net force is always greater than the individual forces. | null | null | Multiple Choice | a. true, b. false | b |
14,327 | NDQ_016560 | combining forces | when two forces act on the same object in the same direction, the net force is always less than the individual forces. | null | null | Multiple Choice | a. true, b. false | b |
14,328 | NDQ_016566 | combustion reactions | most fuels in combustion reactions are compounds called | null | null | Multiple Choice | a. proteins., b. ionic compounds., c. hydrocarbons., d. halogens. | c |
14,329 | NDQ_016568 | combustion reactions | the main component of natural gas is nitrogen. | null | null | Multiple Choice | a. true, b. false | b |
14,330 | NDQ_016569 | combustion reactions | products of incomplete combustion include only carbon dioxide and water. | null | null | Multiple Choice | a. true, b. false | b |
14,331 | NDQ_016583 | compound machine | some compound machines consist of thousands of simple machines. | null | null | Multiple Choice | a. true, b. false | a |
14,332 | NDQ_016585 | compound machine | when you use a wheelbarrow, you apply effort to the | null | null | Multiple Choice | a. wheel., b. axle., c. lever., d. two of the above | d |
14,333 | NDQ_016587 | compound machine | a corkscrew consists of | null | null | Multiple Choice | a. two levers., b. a screw., c. a wheel and axle., d. two of the above | d |
14,334 | NDQ_016588 | compound machine | all machines must overcome friction. | null | null | Multiple Choice | a. true, b. false | a |
14,335 | NDQ_016589 | compound machine | no machine is 100 percent efficient. | null | null | Multiple Choice | a. true, b. false | a |
14,336 | NDQ_016593 | compounds | which of the following is a compound? | null | null | Multiple Choice | a. air, b. oxygen, c. carbon dioxide, d. two of the above | c |
14,337 | NDQ_016594 | compounds | a compound always has the same elements in the same proportions. | null | null | Multiple Choice | a. true, b. false | a |
14,338 | NDQ_016595 | compounds | the properties of compounds are the same as the properties of the elements that form them. | null | null | Multiple Choice | a. true, b. false | b |
14,339 | NDQ_016598 | compounds | which of the following substances is a compound that forms ionic crystals? | null | null | Multiple Choice | a. water, b. sodium chloride, c. carbon dioxide, d. none of the above | b |
14,340 | NDQ_016599 | compounds | which of the following gases is a compound that forms molecules? | null | null | Multiple Choice | a. air, b. carbon dioxide, c. oxygen, d. nitrogen | b |
14,341 | NDQ_016601 | compounds | a molecule consists of two or more atoms bonded together. | null | null | Multiple Choice | a. true, b. false | a |
14,342 | NDQ_016612 | conservation of energy in chemical reactions | which statement about energy and chemical reactions is true? | null | null | Multiple Choice | a. All chemical reactions involve energy., b. Breaking bonds in reactants requires energy., c. Forming bonds in products releases energy., d. all of the above | d |
14,343 | NDQ_016615 | conservation of energy in chemical reactions | energy cannot be created or destroyed in chemical reactions. | null | null | Multiple Choice | a. true, b. false | a |
14,344 | NDQ_016616 | conservation of energy in chemical reactions | energy cannot change form during chemical reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,345 | NDQ_016618 | conservation of energy in chemical reactions | in an endothermic reaction, products have less chemical energy than reactants. | null | null | Multiple Choice | a. true, b. false | b |
14,346 | NDQ_016620 | conservation of energy in chemical reactions | when natural gas burns in a furnace | null | null | Multiple Choice | a. energy is released in the form of heat and light., b. it takes more energy to break bonds in reactants than to form bonds in products., c. the natural gas creates energy as it burns., d. two of the above | a |
14,347 | NDQ_016632 | conservation of mass and energy in nuclear reactions | the letter e in einsteins equation e = mc2 stands for | null | null | Multiple Choice | a. electricity., b. electrons., c. energy., d. efficiency. | c |
14,348 | NDQ_016634 | conservation of mass and energy in nuclear reactions | the letter c in the equation in question 1 represents a constant. | null | null | Multiple Choice | a. true, b. false | a |
14,349 | NDQ_016635 | conservation of mass and energy in nuclear reactions | the speed of light is 300,000 km per hour. | null | null | Multiple Choice | a. true, b. false | b |
14,350 | NDQ_016638 | conservation of mass and energy in nuclear reactions | einsteins equation has recently been disproven by real-world evidence. | null | null | Multiple Choice | a. true, b. false | b |
14,351 | NDQ_016639 | conservation of mass and energy in nuclear reactions | the amount of energy in a tiny amount of mass is very large. | null | null | Multiple Choice | a. true, b. false | a |
14,352 | NDQ_016640 | conservation of mass and energy in nuclear reactions | einsteins equation shows that mass and energy are not conserved in nuclear reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,353 | NDQ_016642 | conservation of mass in chemical reactions | chemical reactions are represented by chemical formulas. | null | null | Multiple Choice | a. true, b. false | b |
14,354 | NDQ_016643 | conservation of mass in chemical reactions | which choice correctly represents the reaction in which methane burns? | null | null | Multiple Choice | a. CH4 + 2O2 → CO2 + 2H2O, b. 2CH4 + 2O2 → CO2 + 2H2O, c. CH4 + O2 → CO2 + H2O, d. none of the above | a |
14,355 | NDQ_016650 | conservation of mass in chemical reactions | the equation h2 + o2 h2o is balanced. | null | null | Multiple Choice | a. true, b. false | b |
14,356 | NDQ_016651 | conservation of mass in chemical reactions | which equation shows that mass is conserved in the chemical reaction? | null | null | Multiple Choice | a. 2Al + 2O2 → 2Al2O3, b. 2Al + O2 → Al2O3, c. 4Al + 3O2 → 2Al2O3, d. none of the above | c |
14,357 | NDQ_016652 | convection | heat is the transfer of thermal energy. | null | null | Multiple Choice | a. true, b. false | a |
14,358 | NDQ_016656 | convection | when particles of matter in one part of a fluid gain thermal energy they | null | null | Multiple Choice | a. move more quickly., b. have more collisions., c. spread farther apart., d. all of the above | d |
14,359 | NDQ_016657 | convection | when particles are more spread out, they have higher density. | null | null | Multiple Choice | a. true, b. false | b |
14,360 | NDQ_016658 | convection | higher density particles sink downward through a fluid. | null | null | Multiple Choice | a. true, b. false | a |
14,361 | NDQ_016661 | convection | convection currents transfer thermal energy through earths | null | null | Multiple Choice | a. oceans., b. atmosphere., c. molten rock., d. all of the above | d |
14,362 | NDQ_016665 | cooling systems | work as defined in physics always involves | null | null | Multiple Choice | a. force., b. motion., c. energy., d. all of the above | d |
14,363 | NDQ_016666 | cooling systems | most cooling systems get energy from electricity. | null | null | Multiple Choice | a. true, b. false | a |
14,364 | NDQ_016667 | cooling systems | in a cooling system, the refrigerant | null | null | Multiple Choice | a. has a high boiling point., b. absorbs thermal energy from air inside the refrigerator., c. pumps cool air into the refrigerator., d. two of the above | b |
14,365 | NDQ_016668 | cooling systems | the refrigerant changes between solid and liquid states as it passes through the refrigerator. | null | null | Multiple Choice | a. true, b. false | b |
14,366 | NDQ_016669 | cooling systems | as a liquid the refrigerant transfers thermal energy to the outside air. | null | null | Multiple Choice | a. true, b. false | b |
14,367 | NDQ_016673 | covalent bonding | in covalent bonds, the atoms that form bonds | null | null | Multiple Choice | a. may be metals or nonmetals., b. transfer electrons., c. may both be the same element., d. all of the above | c |
14,368 | NDQ_016674 | covalent bonding | electrons in covalent bonds are attracted to the nucleus of just one atom. | null | null | Multiple Choice | a. true, b. false | b |
14,369 | NDQ_016676 | covalent bonding | a covalent bond always includes a pair of electrons. | null | null | Multiple Choice | a. true, b. false | a |
14,370 | NDQ_016677 | covalent bonding | elements that form diatomic molecules include | null | null | Multiple Choice | a. oxygen., b. hydrogen., c. chlorine., d. all of the above | d |
14,371 | NDQ_016679 | covalent bonding | the formation of one or more covalent bonds always results in a covalent compound. | null | null | Multiple Choice | a. true, b. false | b |
14,372 | NDQ_016680 | covalent bonding | which of the following is a covalent compound? | null | null | Multiple Choice | a. H2O, b. NaCl, c. O2, d. two of the above | a |
14,373 | NDQ_016683 | crystalline carbon | forms of crystalline carbon include | null | null | Multiple Choice | a. coal., b. graphite., c. charcoal., d. two of the above | b |
14,374 | NDQ_016688 | crystalline carbon | the form of carbon in question 6 has been found in meteorites. | null | null | Multiple Choice | a. true, b. false | a |
14,375 | NDQ_016689 | crystalline carbon | diamonds are used for | null | null | Multiple Choice | a. lubricants., b. jewelry., c. blades., d. two of the above | d |
14,376 | NDQ_016690 | crystalline carbon | the form of crystalline carbon in which each carbon atom is covalently bonded to three other carbon atoms is | null | null | Multiple Choice | a. diamond., b. graphite., c. charcoal., d. coal. | b |
14,377 | NDQ_016691 | crystalline carbon | fullerenes are used to make soccer balls. | null | null | Multiple Choice | a. true, b. false | b |
14,378 | NDQ_016693 | daltons atomic theory | scientists now reject most of daltons atomic theory. | null | null | Multiple Choice | a. true, b. false | b |
14,379 | NDQ_016694 | daltons atomic theory | dalton based his ideas about atoms on his own scientific research. | null | null | Multiple Choice | a. true, b. false | a |
14,380 | NDQ_016695 | daltons atomic theory | dalton investigated | null | null | Multiple Choice | a. pressure of gases., b. ratios of elements in compounds., c. protons and other subatomic particles., d. two of the above | d |
14,381 | NDQ_016696 | daltons atomic theory | according to daltons atomic theory | null | null | Multiple Choice | a. only compounds are made of atoms., b. no two atoms are exactly alike., c. atoms cannot be created or destroyed., d. all of the above | c |
14,382 | NDQ_016697 | daltons atomic theory | dalton thought that atoms consist of smaller particles of matter. | null | null | Multiple Choice | a. true, b. false | b |
14,383 | NDQ_016698 | daltons atomic theory | daltons atomic theory was quickly accepted by most other scientists. | null | null | Multiple Choice | a. true, b. false | a |
14,384 | NDQ_016699 | daltons atomic theory | dalton thought that a given compound always consists of the same kinds of atoms in the same proportions. | null | null | Multiple Choice | a. true, b. false | a |
14,385 | NDQ_016703 | dangers and uses of radiation | there is a low level of natural radiation in the environment. | null | null | Multiple Choice | a. true, b. false | a |
14,386 | NDQ_016704 | dangers and uses of radiation | sources of background radiation include | null | null | Multiple Choice | a. cosmic rays from space., b. atomic bomb testing., c. nuclear power plants., d. all of the above | a |
14,387 | NDQ_016705 | dangers and uses of radiation | background radiation is generally considered harmful to living things. | null | null | Multiple Choice | a. true, b. false | b |
14,388 | NDQ_016706 | dangers and uses of radiation | radiation can cause damage by | null | null | Multiple Choice | a. knocking electrons out of atoms., b. changing atoms to ions., c. breaking bonds in DNA., d. all of the above | d |
14,389 | NDQ_016709 | dangers and uses of radiation | only living things can be harmed by radiation. | null | null | Multiple Choice | a. true, b. false | b |
14,390 | NDQ_016713 | decomposition reactions | which general equation represents a decomposition reaction? | null | null | Multiple Choice | a. A + B → AB, b. AB → A + B, c. AB + C → AC + B, d. AC → A + B | b |
14,391 | NDQ_016714 | decomposition reactions | products of decomposition reactions are always individual elements. | null | null | Multiple Choice | a. true, b. false | b |
14,392 | NDQ_016715 | decomposition reactions | examples of decomposition reactions include | null | null | Multiple Choice | a. 2H2O2 → 2H2O + O2., b. NH3 + H2O → NH4OH., c. 2NaCl → 2Na + Cl2., d. two of the above | d |
14,393 | NDQ_016720 | decomposition reactions | the reaction 2al2o3 4al + 3o2 is a decomposition reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,394 | NDQ_016724 | democrituss idea of the atom | according to democritus, atoms are | null | null | Multiple Choice | a. too small to see., b. indestructible., c. unable to be subdivided., d. all of the above | d |
14,395 | NDQ_016725 | democrituss idea of the atom | democritus thought that atoms are motionless. | null | null | Multiple Choice | a. true, b. false | b |
14,396 | NDQ_016726 | democrituss idea of the atom | democritus thought that atoms are separated from each other by empty space. | null | null | Multiple Choice | a. true, b. false | a |
14,397 | NDQ_016729 | democrituss idea of the atom | what happened to democritus ideas about atoms? | null | null | Multiple Choice | a. They were ridiculed by Aristotle., b. They were widely accepted in his own lifetime., c. They were almost forgotten for more than 2000 years., d. two of the above | d |
14,398 | NDQ_016731 | democrituss idea of the atom | democritus ideas were based on experimental evidence. | null | null | Multiple Choice | a. true, b. false | b |
14,399 | NDQ_016753 | descriptive statistics | the central tendency of a sample can be represented by the | null | null | Multiple Choice | a. mean., b. median., c. mode., d. any of the above | d |
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