1017 Chapter 1
What is the formula to convert from °F to °C?
(°F - 32) x 5/9 = °C
Which of the following properties of an ice cube are physical properties? - It is hard. - It is cold to the touch. - It reacts with CO₂ to form carbonic acid. - It has a mass of 27.3 g.
- It is hard. - It is cold to the touch. - It has a mass of 27.3 g.
Which of the following properties of iron are chemical properties? - It is shiny. - It rusts in water. - It reacts with chlorine to form iron chloride. - It has a mass of 112.23 g.
- It is shiny. - It rusts in water. - It reacts with chlorine to form iron chloride.
Classify each was a chemical of physical property:
...
classify it as an element, a compound, or mixture: milk Carbon dioxideCO₂ Helium He Potassium bromide KBr Silver Ag
...
How many Fahrenheit degrees are between the freezing point and the boiling point of water? Celsius degrees? Kelvin? (Express your answer numerically in degrees.)
180°F∘ 100°C. 100°K
1gal=____L.
1gal=3.78L.
1km=________mi
1km=0.6214mi
Pure chemical substances can be further divided into __________ or _____________.
elements or compounds
Classify each of the following substances as an element, a compound, or a mixture: argon (Ar) air salt (NaCl) iron (Fe) carbon dioxide (CO₂)
elements: argon (Ar) iron (Fe) compounds: salt (NaCl) carbon dioxide (CO₂) mixtures: air
A sample is composed completely of gold, absolutely free of impurities. Which term or terms could be used to describe this sample? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
A sample is composed completely of gold, absolutely free of impurities. Which term or terms could be used to describe this sample? Check all that apply. pure chemical substance element All elements are pure. If this sample of gold had been impure, we would call it a mixture, not an element.
________ is an intensive physical property that relates the mass of an object to its volume.
Density -Density, which is simply the mass of an object divided by its volume, is expressed in the SI derived unit g/mL for a liquid or g/cm3 for a solid (1mL=1cm3). -Most substances expand or contract when heated or cooled, so the density values for a substance are temperature dependent..
classify it as an element or a compound. - Iron is an compound, carbon monoxide is a element. - Iron is an element, carbon monoxide is a compound. - Both are elements. - Both are compounds.
Iron is an element, carbon monoxide is a compound.
______ can be classified into several categories. All substances are either pure chemical substances or mixtures.
Matter
_________ can be separated into their component parts through physical means, whereas ____ ________ substances require chemical or nuclear reactions to separate them.
Mixtures; pure chemical
_________ can be either heterogeneous or homogeneous. Homogeneous mixtures are also called _________.
Mixtures; solutions
classify as homogeneous or heterogeneous: - Wine is heterogeneous, beef stew is homogeneous. - Wine is homogeneous, beef stew is heterogeneous. - Both are homogeneous. - Both are heterogeneous
Wine is homogeneous, beef stew is heterogeneous.
After ______________ or ___________, the answer cannot have more digits to the right of the decimal point than any of the original numbers.
addition or subtraction
A solution is another name for a ____________ ________. For example, vodka is a solution of alcohol and water. If something has a percentage value (such as 40% alcohol by volume), this is a good indication that you are dealing with a solution and not a pure substance.
homogeneous mixture
Classify the following mixtures as homogenous or heterogeneous: vodka saltwater granite fruit salad bronze
homogenous: vodka saltwater bronze heterogeneous: granite fruit salad
A blood sample contains several different types of cells, each of which contains different combinations of specific ions and molecules. The cells are suspended in water, and the water also contains many molecules and ions. Which term or terms could be used to describe this sample? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
mixture heterogeneous mixture
A sample of tap water consists of water, fluoride ions, calcium ions, and several other dissolved ions. The ions are evenly distributed throughout the water. Which term or terms could be used to describe this sample of tap water? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
mixture homogenous mixture solution
After ______________ or ___________, the answer cannot have more significant figures than any of the original numbers.
multiplication or division
A balloon is filled with pure carbon dioxide. Which term or terms could be used to describe the contents of this balloon? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
pure chemical substance compound All compounds are pure. If this sample of CO2 had been impure, we would call it a mixture, not a compound.
What is the formula to convert from °K to °C?
°C = °K-273.15
What is the formula to convert from °C to °F?
°C x 9/5 + 32 = °F
What is the formula to convert from °C to °K?
°K = °C+273.15
