Elements & Compounds
What is the smallest unit of an element?
What is an atom?
What is the atomic number of Hydrogen?
which element is 1?
What is a sign that a chemical reaction has occurred?
What is a color change/gas formed/temperature change/etc.?
What particles are found in the nucleus of an atom?
What are protons and neutrons?
Who first suggested that matter is made of tiny indivisible particles called “atomos”
Who is Democritus?
What do you call a pure substance made of two or more elements chemically combined?
What is a compound?
What are the vertical columns on the periodic table called?
What are groups?
What do we call substances that are present before the reaction?
What are reactants?
What is the charge of an electron?
What is negative?
Which scientist proposed the first modern atomic theory in 1803?
Who is John Dalton?
Which element is needed for combustion to occur?
What is oxygen?
Name a noble gas.
What is helium/neon/argon/etc.?
What type of reaction is: A + B → AB?
What is a synthesis reaction?
How many electrons can the first shell hold?
What is 2?
What was Dalton’s model of the atom like?
What is a solid, indivisible sphere?
Is salt (NaCl) an element, compound, or mixture?
What is a compound?
Which group contains the alkali metals?
what is group 1?
What law states that matter cannot be created or destroyed?
What is the Law of Conservation of Mass?
What determines the atomic number of an element?
What is the number of protons?
Who said atoms of the same element are identical?
Who is John Dalton?
Name one difference between a mixture and a compound.
What is compounds are chemically bonded, mixtures are not?
Which element has the chemical symbol Fe?
What is Iron?
In a chemical equation, what does the arrow (→) mean?
What is "yields" or "produces"?
What is an isotope?
An atom with the same number of protons but different number of neutrons?
Which part of Dalton’s theory was later proven wrong?
"atoms are indivisible" We now know they are made of smaller parts