Concept explainers
Videos
(a)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(b)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(c)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(d)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(e)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(f)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(g)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(h)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(i)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(j)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(k)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
(l)
Interpretation:
Elements or compound or molecule should be identified.
Concept introduction:
A molecule is neutral group of two or more atoms joined together by chemical bonds.
A chemical element is a species of atoms having the same number of protons in their atomic nuclei.
Compound is composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
Want to see the full answer?
Check out a sample textbook solution
Chapter 5 Solutions
Chemistry: Atoms First
- Bromine (atomic mass 79.904 amu) consists of 2 different naturally occurring isotopes, Br-79 (atomic mass = 78.9193 amu) and Br-81 (80.9163 amu). If a student measures out 35.47 mL of Br2(l), which has a density = 3.119 g/mL), calculate the number of atoms of Br-81 in the given volume of bromine liquid.arrow_forwardFor each of the following elements, write its chemical symbol,locate it in the periodic table, give its atomic number,and indicate whether it is a metal, metalloid, or nonmetal:(a) chromium, (b) helium, (c) phosphorus, (d) zinc, (e) magnesium,(f) bromine, (g) arsenic.arrow_forwardWhich of the following steps in an overall process involve( s) a physical change and which involve(s) a chemical change?arrow_forward
- The mass of a single vanadium atom is 8.46×10-23 grams. How many vanadium atoms would there be in a sample of vanadium with a volume of 305 cm3 if the density of vanadium is 6.20 g/cm3? I get confused when I'm given info that is already in scientific form. Do I expand them or do I leave it as it is? And I am not sure what form my answer is supposed to be in.arrow_forwardThe density of gold metal is 19.3 g/cm3, while that for silver is 10.5 g/cm3. Suppose you had the same size bar of each metal, with the dimensions 2.00 in x 10.0 cm x 760 mm. Volume of a cube is height x length x width. Which bar would have the greatest mass? Which bar contains the greater number of atoms? If the two bars were melted and mixed together to form an alloy (or mixture) what would be the total mass?arrow_forwardThe mass of a copper coin is 7.83 g. Suppose it were pure copper. a) How many moles of Cu atoms would the copper contain, given that the molar mass of Cu is 63.55 g/mol? The calculation has been set up for you. You must fill in the blanks with the correct values, including units. Round your answer to 3 significant figures. 7.83 g × (y) = (z) (x) = (y) = (z) = %3D b) How many Cu atoms are present? The calculate has been set up for you. You must fill in the blanks with the correct values, including units. Round your answer to 3 significant figures and use the exponent notation for Avogadro's number (i.e. 6.022E23 atoms). Note that (z) is the same value as above, so you don't need to fill it in again below. (m) (z) × (n) (p) (m) = (n) = (p) =arrow_forward
- Classify each of the following as a compound, a homogeneous mixture, or a heterogeneous mixture: (a) distilled water; (b) gasoline; (c) beach sand; (d) wine; (e) air.arrow_forwardClassify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals, or metallic crystals:arrow_forwardCompounds are combinations of elements. The combination of those elements is specific to the compound. Some compounds have the exact same elements but in different amounts. Look at C6H12O6, which you hopefully recognize as glucose (think cellular respiration and photosynthesis. But ribose is a 5 carbon sugar and its formula is C5H10O5 which you hopefully recognize (think RNA). They both have the same elements, but have different numbers of each element (sugars all have the 1:2:1 ratio). When you're looking at a formula, it's wise to look for the capital letters. That indicates when a different element is present. For glucose, there's a capital C - carbon, a capital H - hydrogen, and a capital O - oxygen. Behind elements, the subscripts help indicate the number of each element that's present. In glucose, there are 6 carbons, 12 hydrogens, and 6 oxygens. How many carbons, hydrogens, and oxygens does ribose have in its formula?arrow_forward
- Given that 6.02 x 1023 ethanol molecules have a mass of 46.04 g, calculate the number of ethanol molecules in a film of ethanol that is 3.08 mm by 10.0 cm by 0.0015 mm. Assume the density of ethanol is 0.790 g/mL.arrow_forwardWhich elements have molecules as their basic units?(a) helium (b) oxygen(c) iron (d) brominearrow_forward3. (a) Magnesium oxide was formed when the metal burns in air. (i) If 1.25 g of magnesium oxide contains 0.754 g of magnesium, determine the mass ratio of magnesium magnesium oxide. (ii) Calculate the weight of magnesium in 534 g of magnesium oxide.arrow_forward
World of Chemistry, 3rd editionChemistryISBN:9781133109655Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCostePublisher:Brooks / Cole / Cengage Learning
Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning