Reactions
Ice melting is an example of chemical change or physical change.
Physical change
Element or a compound?
NaCl
Compound
What goes up and down on the periodic table?
Groups
A pure substance made of only one type of atom.
Element
The insect is able to walk on the water without sinking due to_________-.
Surface tension
Burning wood is an example of a chemical change or a physical change.
Chemical change.
Element or compound?
Fe4
Element
What goes from left to right on the periodic table?
Periods
Baking soda dissolved in water. (Physical change is not the answer)
Homogeneous
If it has a pH of 5.0-6.5 it is a(n)_______.
Acid
Mixing vinegar and baking soda is an example of a chemical change or a physical change.
Chemical change
How many elements are there on the product side?
Ca(OH)2 + CO2 → CaCO3 + H2O
4
Where are metalloids located on the periodic table.
Along the staircase.
A water molecule (H2O)
A compound
On the pH scale water is?
Neutral 7.0
A substance dissolving in water. Chemical change or physical change.
Physical change.
How many elements are there?
Al2( S4O2)3
3
____________are good conductors of electricity and can be pulled into a wire or hammered flat.
Metals
Two or more different atoms chemically combined.
A compound
The attraction of water molecules to other water molecules is called__________.
Cohesion
A color change is evidence of a chemical or a physical change.
Chemical change
How many product molecules are in the equation?
4Al + 3O2→2Al2O3
2
Elements in a periodic table are arranged from left to right and top to bottom in order of...
Increasing atomic number
A non-uniform combination of particles with visible distinct parts.
Heterogeneous
The Law of Conservation of Mass states...
Matter can not be created or destroyed.