an element that has 28 electrons in a neutral atom
What is chlorine?
100
solids, liquids, or gases; brittle solids; poor conductors of electricity
What are nonmetals?
100
the density of an object with mass 82.3 g and volume 243.4 mL
What is 0.338 g/mL?
100
It has a definite volume but not a definite shape.
What is a liquid?
100
a match burning
What is a chemical change?
200
atoms with the same number of protons but different numbers of neutrons
What are isotopes?
200
the type of elements most commonly found in the human body
What are nonmetals?
200
the mass of an object with density 0.876 g/mL and mass 256.1 mL
What is 224.34 g?
200
a gas cools to form a liquid
What is condensation?
200
changes that are irreversible
What is a chemical change?
300
he introduced the idea that matter is made up of tiny, individual bits called atoms
Who is Democritus?
300
atoms of different elements are combined together without making a compound
What is a mixture?
300
the volume of an object with a density of 12.5 g/mL and mass of 9.78 g
What is 0.782 mL?
300
a property of a liquid that enables insects to walk on water
What is surface tension?
300
mass, volume, and length
What are size-dependent properties?
400
subatomic particles that were once called cathode rays
What are electrons?
400
passing a liquid and solid through filter paper on a funnel, using tweezers to separate rice and salt, heating a sugar and water solution to separate the sugar and water
What are ways to separate a mixture?
400
the density of a cube with sides equal to 1.2 cm and mass of 14.5 g
What is 8.39 g/cm3?
400
a lab technique where an object is placed into water and the volume of the water is measured to give an idea about the volume of the object
What is water-displacement (volume displacement)?
400
bitter and slippery
What are physical properties of bases?
500
an element that has 35 neutrons and a mass number of 64
What is copper?
500
a chemical formula for 6 molecules of a compound with two atoms of hydrogen and one atom of oxygen
What is 6H2O?
500
the density of a 15.2 g cylinder with a radius of 4.5 cm and a height of 4.12 cm
volume of a cylinder = 3.14(height)(radius)^2