Chemical Reactions
In an endothermic reaction, energy is
Absorbed
If describe methane as a gas that easily catches fire you are describing a ____________ property.
Chemical
The SI Unit for mass is the ________________.
Ounce
Pound
Kilogram
Liter
Kilogram
What holds atoms together in a molecule?
A Chemical Bond
Table Salt and Water are examples of ______________.
Atoms
Elements
Mixtures
Substances
Substances
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed
Please write down one example of a physical change.
Dissolving sugar, Changing hair color, Melting.
The mass of a book is 70 grams, and the volume is 35 cm^3. What is the density of the book?
Add units.
The density is 2 g/cm^3
H20, CO2, NaCl are examples of Chemical __________
Formulas
Chemistry is the _________________________________________.
study of matter and how it changes.
The only sure evidence for a chemical reaction is…
The formation of a gas.
A color change.
The production of one or more new substances.
changes in properties.
The production of one or more new substances.
Write down one example of a chemical change.
Anything burning, When a new substance is formed.
How would you calculate the density of an object?
Divide its mass by its volume.
A type of chemical bond where the electrons are shared equally is a ____________ _________.
Covalent Bond
The ability to do work or cause change describes _______________.
Energy
Substances that enter into a chemical reaction are called products.
True or False
False they are reactants.
In a physical change, some of the physical properties of the substance may be altered and the chemical composition remains the same.
True or False
True
Anything that has mass and takes up space is called______________.
Matter
What charge do an electron, proton, and a neutron have?
Electron = Negative
Proton = Positive
Neutron = Neutral
Cereal, M&M's, and a Coin Collection are all types of ______________.
Mixtures
When and ice cube absorbs energy and melts it is an endothermic or exothermic reaction
endothermic reaction
If you heat a liquid and measure the temperature when it boils you are measuring a(n) ________________ property
Physical
The volume of an irregular object can be measured by.......
Submerging the object in water in a graduated cylinder.
On the Periodic Table, the Atomic Mass of an Element tells you what about an element?
The number of Protons an element has.
Please balance this chemical reaction.
Mg + O2 ---> MgO
2Mg + O2 ---> 2MgO