Concept explainers
a.
To determine:
If the given substance is a compound or an element.
Introduction:
A compound is a substance which is made up of two or more than two elements and is joined by
An element is made up of only one type of atoms. They are substances that cannot be separated into simpler substances.
b.
To determine:
If the given substance is a compound or an element.
Introduction:
A compound is a substance which is made up of two or more than two elements and is joined by chemical bonds. The atoms of different elements combine to form compounds.
An element is made up of only one type of atoms. They are substances that cannot be separated into simpler substances.
c.
To determine:
If the given substance is a compound or an element.
Introduction:
A compound is a substance which is made up of two or more than two elements and is joined by chemical bonds. The atoms of different elements combine to form compounds.
An element is made up of only one type of atoms. They are substances that cannot be separated into simpler substances.
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General, Organic, and Biological Chemistry (3rd Edition)
- The following are properties of substances. Decide whether each is a physical property or a chemical property. a Chlorine gas liquefies at 35C under normal pressure. b Hydrogen burns in chlorine gas. c Bromine melts at 7.2C. d Lithium is a soft, silvery-colored metal. e Iron rusts in an atmosphere of moist air.arrow_forwardFrom the information given, classify each of the pure substances A through D as elements or compounds, or indicate that no such classification is possible because of insufficient information. a. Substance A cannot be broken down into simpler substances by chemical means. b. Substance B cannot be broken down into simpler substances by physical means. c. Substance C readily dissolves in water. d. Substance D readily reacts with the element chlorine.arrow_forwardAll of the following processes involve a separation of either a mixture into substances or a compound into elements. For each, decide whether a physical process or a chemical reaction is required. a Sodium metal is obtained from the substance sodium chloride. b Iron filings are separated from sand by using a magnet. c Sugar crystals are separated from a sugar syrup by evaporation of water. d Fine crystals of silver chloride are separated from a suspension of the crystals in water. e Copper is produced when zinc metal is placed in a solution of copper(II) sulfate, a compound.arrow_forward
- Which of the following are elements, and which are compounds? a NaOH; b BaCl2; c He; d Ag; e Fe2O3.arrow_forward1f a piece of hard, white blackboard chalk is heated strongly in a flame, the mass of the piece of chalk will decrease, and eventually the chalk will crumble into a white dust. Does this change suggest that the chalk is composed of an element or a compound?arrow_forwardDecide whether each of the following is a physical property or a chemical property of the substance. a Salt substitute, potassium chloride, dissolves in water. b Seashells, calcium carbonate, fizz when immersed in vinegar. c The gas hydrogen sulfide smells like rotten eggs. d Fine steel wool (Fe) can be burned in air. e Pure water freezes at 0C.arrow_forward
- Classify the substances represented by the models in Problem 1-57 as to the number of atoms present per molecule, that is, as diatomic, triatomic, tetraatomic, etc.arrow_forward1.82 Which of the following molecular-scale diagrams best represents a pure compound? Explain your answer.arrow_forwardWhich of the following are chemical changes? Which are physical changes? a. the cutting of food b. interaction of food with saliva and digestive enzymes c. proteins being broken down into amino acids d. complex sugars being broken down into simple sugars e. making maple syrup by heating maple sap to remove water through evaporation f. DNA unwindingarrow_forward
- Which of the following particulate illustrations represent pure substances and which represent mixtures?arrow_forwardWhich of the following are compounds, and which are elements? aNa2S bBr2 cPotassium hydroxide dFluorine eCompound or element fCompound or elementarrow_forwardWhich of the following are pure substances and which are mixtures? For each, list all of the different phases present. a bromine liquid and its vapor b paint, containing a liquid solution and a dispersed solid pigment c partially molten iron d baking powder containing sodium hydrogen carbonate and potassium hydrogen tartratearrow_forward
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