You are watching: In the equation 2 h2 + o2 → 2 h2o,
A(n) ________ forms when two atoms transfer electrons.Select one:a. hydrogen bondb. covalent bondc. ionic bondd. element
The magnesium atom contains 12 electrons, 12 protons, and 13 neutrons. What is the mass number of magnesium?Select one:a. 22b. 25c. 12d. 0e. 24
What is the atomic mass of an atom that has 12 protons,13 neutrons, and 12 electrons?Select one:a. 13b. 25 c. 8d. 12e. 24
In the equation 2 H2 + O2 → 2 H2O,Select one:a. H2, O2, and H2O are all elements.b. only H2O is a molecule.c. H2, O2, and H2O are all compounds.d. only H2 and O2 are molecules.e. H2, O2, and H2O are all trace elements.
Electrons move about the nucleus of an atom in the same way thatSelect one:a. cars are parked along the sides of a street.b. birds migrate to a new winter home.c. people pass each other along a sidewalk.d. boats cross a lake.e. insects fly around a bright lamp at night.
(Picture goes here)What change is occurring in this figure?Select one:a. Chlorine is filling its third electron shell. b. Sodium is filling its third electron shell.c. Chlorine is losing an electron.d. Sodium is becoming negatively charged.e. Sodium is gaining an electron.
A pharmaceutical company hires a chemist to analyze the purity of the water being used in its drug preparations. If the water is pure, the chemist would expect to findSelect one:a. only H+ ions and OH- ions.b. H2O molecules and OH- ions.c. H2O molecules, H+ ions, and OH- ions. d. only molecules of H2O.e. H2O molecules and H+ ions.
What happens to an atom if the electrons in the outer shell are altered?Select one:a. The atom"s characteristics change and it becomes a different element.b. The atom will remain the same.c. The properties of the atom will change.d. The atom will disintegrate.e. The atom becomes radioactive.
What is the fundamental difference between covalent and ionic bonding?Select one:a. In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not.b. Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell.c. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. d. Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.e. In a covalent bond, the partners have identical electronegativity; in an ionic bond, one of them is more electronegative.
c. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. Correct
In the equation 2 H2 + O2 → 2 H2O, the H2O molecules are ________ and the H2 molecules are ________.Select one:a. assets . . . reactants b. damaged . . . createdc. used . . . storedd. reaction . . . productse. produced . . . destroyed
Which of the following statements regarding chemical reactions is false?Select one:a. The atoms of the reactants are exactly the same as the atoms of the products.b. Some chemical reactions create electrons; others destroy them. c. Chemical reactions involve the making and breaking of chemical bonds.d. The reactants contain the same number of atoms as the products.e. Although the atoms of a reaction"s reactants and products are identical to each other, their molecular formulae differ.
Which of the following best describes the mass number of an atom?Select one:a. the number of protons in the atomb. the number of electrons in the atomc. the net electrical charge of the atomd. the number of protons and neutrons in the atome. the number of protons, electrons, and neutrons in the atom
The four most common elements in living organisms areSelect one:a. C, H, O, Fe.b. C, H, O, Na.c. Fe, N, O, Ca.d. C, N, O, Na.e. C, H, O, N.
When full, the innermost electron shell of neon contains ________ electrons, and the outermost shell contains ________ electrons.Select one:a. 4 . . . 8b. 2 . . . 2c. 2 . . . 8 d. 8 . . . 2e. 8 . . . 8
Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An ion of nitrogen couldSelect one:a. have more more protons.b. be positively charged.c. have more atoms.d. have more neutrons.
Table salt is formed whenSelect one:a. chlorine gives an electron to sodium.b. sodium donates its single outer electron to chlorine c. sodium crystals combine with chlorine crystals.d. a hydrogen bond forms between sodium and chlorine.e. sodium and chlorine share electrons to form a bond.
An uncharged atom of carbon has an atomic number of 6 and an atomic mass of 12. How many electrons does carbon have?Select one:a. 0b. 5c. 6 d. 2e. 15
The tendency of water molecules to stick to other things is referred to asSelect one:a. adhesion. b. polarity.c. evaporation.d. transpiration.e. cohesion.
Which of the following particles is found in the nucleus of an atom?Select one:a. only electronsb. only neutronsc. protons and neutrons d. protons and electronse. only protons
In a water molecule, hydrogen and oxygen are held together by a(n) ________ bond.Select one:a. polar covalentb. nonpolar covalentc. ionicd. double covalent
Which of the following is a trace element in the human body?Select one:a. argonb. hydrogenc. oxygend. nitrogene. carbon
Which of the following statements best describes a compound?Select one:a. A compound is less common than a pure element.b. A compound is a pure element.c. A compound contains two or more different elements in a fixed ratio. d. A compound is exemplified by sodium.e. A compound is a solution.
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A solution with a pH of 6 isSelect one:a. weakly acidic.b. weakly basic.c. neutral.d. strongly acidic.e. strongly basic.
Chemistry: The Central Science14th EditionBruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore Brown