CHEMISTRY - UNIT 2: STARTING THE INVESTIGATION: HOW TO IDENTIFY ELEMENTS, COMPOUNDS, AND MIXTURES USING CHEMICAL AND PHYSICAL PROPERTIES TO IDENTIFY SUBSTANCES (11th grade)
False
Density is inversely proportional to pressure.
1.1 g
Helium has a density of 1.79 x 10 -4 g/mL at standard temperature and pressure. A balloon has a volume of 6.3 liters. Calculate the mass of helium that it would take to fill the balloon.
True
Diamond will scratch quartz.
True
Hardness is a physical property.
Strength of chemical bonds
Hardness is indirectly related to:
True
Hardness may be defined as the resistance of a material to scratching.
Density
Mass per unit volume
False
Plastic products are made from inorganic compounds.
True
Platinum will scratch gold.
Mass = 433.1 g Density = 6.60 g/cm 3
Read the balance and use this data to determine the density of a sample. The sample displaced 65.6 mL of water. Top- ^400 Middle- ^30 Bottom- ^3.1
3.340 g/cm 3
Researchers have discovered that a moon rock brought back by the Apollo astronauts has a mass of 5.671 kg and a volume of 1,698 cm 3 . What is the density of the rock? Remember to use the correct number of significant digits in your answer.
Hardness
Resistance of a material to being scratched
False
The Mohs hardness scale increases linearly from 1 to 10.
False
The density of a gas cannot be measured.
Mohs
The name of the commonly used hardness scale is:
inorganic
The rocks and minerals of the Earth consist of compounds.
Softest: Talc Hardest: Diamond
The softest and hardest minerals are:
g/cm3
The usual units of density are:
mass = 693.8 g
Top- ^600g Middle- ^90g Bottom- ^3.8
air at sea level
Which has the greater density?
Mass/volume = density
Which is the correct definition of density
Its density is less than air.
Why does a weather balloon filled with Helium rise?
Its density is less than water.
Why does ice float after it crystallizes?
Density =0.92 g/cm 3
A 56 g sample of peanut oil has a volume of 60.9 cm³. Calculate the density of the peanut oil. Remember to use the correct number of significant digits in your answer.
organic
All man-made and most carbon-based compounds are .
False
All organic compounds are found in living organisms.
Density of substance =693.9 g/mL Hint: Be sure to use proper significant figures.
An unknown insoluble substance displaced the water shown. Its mass is indicated on the triple beam balance. Top- ^600 Middle- ^ 90 Bottom- ^3.9
its density generally increases
As a substance changes phase from gas to liquid to solid:
NaCl:inorganic phenol (C 6 H 6 O):organic C 2 H 6 :organic .Ca 3 (PO 4 ) 2 :inorganic formaldehyde (CH 2 O):organic MgCO 3 :inorganic vitamin D 2 (C 27 H 40 O):organic mercury sulfate (HgS):inorganic butane (C 4 H 10 ):organic sand (SiO 2 ):inorganic water (H 2 O):inorganic
Classify each item as organic or inorganic.
Organic
Compounds that contain carbon
Inorganic
Compounds that do not contain carbonorganic
