Science Flashcards
Is density a property?
Yes, density is a ratio and there fore does not depend on the amount of substance.
2Mg + O2 = 2MgO
The symbol tells you what types of _____ are in substances.
Elements
The new substances that are made from/by a chemical reaction are called ____ .
Products
Is burning a chemical reaction?
Yes
What are three ways we can model a chemical reaction?
1) Word equation
2) Chemical Reaction
3) Molecular model
2Mg + O2 = 2MgO
The 2 before the Mg is called the ____. It shows ____ ?
It is called the coefficient
It shows how many you need
The old substances that go into a chemical reaction are called ____.
Reactants
Define volume
The amount of space an object takes up
What evidence did you observe that might indicate a chemical reaction happened? (Lesson 6)
1) Inflation of bag
2) Bag became warm - created heat
3) Formation of precipitate/solid in the bag
How can you prove what happens to properties when you combine them after doing the magnesium experiment?
To prove the properties changed you could prove they changed such as saying the color and state of matter. (Or whatever apply’s to it)
Define Mass
The amount of matter in an object
Are volume and mass properties?
No. This is because the mass and volume change depending on the size of your sample.
Define density
The mass in a set volume of a substance
What evidence do you need in order to know a chemical reaction has, or has not happened?
Test and compare the properties after and before. If they are different, a chemical reaction has took place. If they are the same, no reaction has took place.
2Mg + O2 = 2MgO
The ____ (tiny 2) tells you how many atoms of that element are in the substance
Subscript
