Elements vs Compounds
True or False: Salt (NaCl) is an element
False
Which of these is a mixture?
A: Water, H2O
B: Lemonade
C: Oxygen, O2
D: Carbon dioxide, CO2
b. lemonade
What is the unit for mass?
grams
Conducts electricity
metals
What is the phase change from solid to liquid?
Melting
What is the smallest unit of an element that still retains the properties of that element?
an atom
Which are combined chemically at the atomic level, mixtures or compounds?
compounds
What is the formula for density?
Mass/Volume
Are brittle
nonmetals
This state of matter has a definite shape, but no definite volume.
liquid
Compounds are made of more than one -----
Elements
Which can be separated easily, mixtures or compounds?
mixtures
As the temperature of a substance generally increases, what happens to its density?
Density decreases
Are malleable
metals
Which of these is chemical change?
A. rusting
B. making crystal light
C. opening a soda
rusting
Between elements, compounds, mixtures, which are pure?
elements and compounds
Made from chemically combining two or more elements
Compounds
What are the units for density of regular objects?
g/cm3
Found between the metals and non metals (example: silicon is brittle and conducts electricity)
metalloids
Chemical change is different than physical change because they form what?
new stuff
What compound is made when 2 hydrogen and 1 oxygen molecule is bonded together?
Hydrogen peroxide
Does a kilogram of feathers have the same mass as a kilogram of lead?
Yes (a kilogram is a kilogram)