Atoms
all matter are made of
atoms
How are elements organized in the periodic table?
by increasing atomic number = the number or protons
A solution is an example of what type of mixture
A heterogenous mixture because it contains two or more substances blended evenly
What caused the sealed bag to expand when we mixed baking soda and vinegar inside the bag?
the formation of gas during a chemical reaction (change)
when ice melts and turns from a solid to a liquid what type of change has occurred?
a physical change
when you add a proton to an atom you change what about that atoms identity?
the element it is
This group or family contains the most reactive metals on the periodic table
Alkali Metals
This is and example of the simplest, most pure, form of a substance.
any element
During a physical change of matter what will not change?
mass
a change in the State of matter is an example of what type of change?
a Physical Change
electrons orbit the outside of the atom and are involved in ...
chemical bonds
Elements in a group have similar chemical and physical properties and are arranged ... on the periodic table
vertically, going up and down
A mixture like salt water can be separated by ...
Filtration of evaporation.
how must the number of atoms in the reactants of a chemical equations compare to the number of atoms in the products
they must be equal
If H2O were to be split into H and OH is an example of a chemical change in which bonds are ...
broken, energy is released
If I add 10g of oxygen to 20g of hydrogen how many grams of H2O should I have created?
30g
elements across a period are very different and are arranged ... on the periodic table
horizontally, from left to right
a compound is composed of two or more atoms combined by ________.
chemical bonds
why did the mass drop when we mixed the baking soda and vinegar in the open cup?
because during the reaction a chemical change occurred and gas was produces which expanded out of the cup and into the room.
An example of a exothermic chemical reaction of change is ...
burning wood, or anything else. Bonds are broken energy is released
electrons carry a _____ charge
negative
Which best determines an elements placement on the periodic table
it's properties
heterogenous mixture are so named because ...
they are not evenly mixed, they do not have a uniform composition, they are not the same throughout.
for a chemical reaction equation to be correct and follow the law of the conservation of matter it must be .....
balanced, have the same number of each type of atom on both sides of the equation (the arrow)
a solid can be changed into a liquid and a liquid into a gas by
adding heat, raising temperature