A25.00 ml sample of hbr is titrated with a 0.150 m standardized sodium hydroxide solution. the endpoint was reached when 18.80 ml of titrant had been added. calculate the molar concentration of the hbr.

Which is true of chemicals? a. things containing chemicals always cost a lot of money. b. chemicals are never dangerous. c. chemicals are in many substances in a home. d. chemicals are rarely found on earth.

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What is the independent variable in this investigation? mass volume sample number substance density