Science (chemical and physical) Flashcards
If a student is combining two substances and sees bubbles and fizzing, a ________ change is taking place
Chemical change
A student turns two liquids together and they turn into a solid. What type of change has happened. Why?
Chemical, because a new substance was formed
What is the production of precipitate
Formation of solid particles out of a liquid
A student has two 100ML beakers of different clear liquids, both at room temperature. The student mixes them, which of these reactions would NOT show a chemical change?
A* The mixtures volume is 200
B* The mixture turns blue
C* The mixture heats up
A* The mixtures volume is 200
Does burning firewood cause a chemical change?
Yes!
What happens when a substance changes color
A chemical change occurs
(new substance)
Someone boils water until it evaporates. What type of change has happened. Why
Physical, because a new substance was NOT formed
What principle demonstrates when the denser liquid sinks?
Physical changes are often reversable
Matter is never destroyed or created in chemical reactions (true or false)
True
What does fizzing and bubbles show?
Formation of gas
When elements bond together, this is a result in a…
Chemical change
A half even apple turns brown. How do we know this is a chemical change?
Change in color
Glass shattering (chemical or physical)
Physical, the identify of the glass wasn’t altered
Water freezing is an example of chemical or physical changes…
Physical, a new substance was NOT formed
Which type of matter is easier to reverse
Physical change
