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B11 Science Chemisty

B11 Science Chemistry

QuestionAnswer
salad is an example of a heterogeneous mixture
Atomic theory was stated by Dalton
Every element has its own ____ which identifies that element atomic number
The atomic number is the number of the ____ in the nucleus protons
All ______ is made up of elements matter
1st person to suggest existence of atoms Democritus
All atoms of the same element have the same protons
Positively charged particle is proton
A molecule of sugar contains carbon and sodium False
Water is an example of a compound
Hydrogen and oxygen are__________that are gasses at room temperature elements
Compounds are formed as a result of _____ changes chemical
Element with the smallest number is hydrogen
Found in the energy level of an atom electrons
A molecule is made of 2 or more atoms, Chemically combined
Substance used to dissolve another substance solvent
You could separate a mixture of sand and water by _____ the mixture filtering
A ____ is made up of two or more elements compound
A substance made up of two or more elements that have chemically combined is a compound True
A compound has no definite chemical composition False
Oxygen is usually found as a gas
Elements are arranged in the periodic table by their atomic number
Smallest part of an element still identified as an element atom
NOT found in the nucleus of an atom electrons
_____are a shorthand way of writing the name of the element chemical symbols
Two or more substances that have been combined but not chemically changed make up a compound False
A gas that is an element and cannot be broken down oxygen
Scientist who constructed the 1st periodic table Mendeleev
Atoms are made up of electrons, protons, neutrons
A molecule of water contain two hydrogen atoms joined to one oxygen atom True
I should know how to label parts of an atom true
I should know how to read an entry of the periodic table of elements true
I should know how to tell how many atoms are in a compound True
In a mixture, substances Keep their own properties
In the periodic table elements are arranged by, increasing atomic number
N3H4 has this many atoms 7
H2O has _____ atoms 3
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