Material World Flashcards
The amount of matter contained in an object is the ______
Mass
The amount of space occupied by an object is the ______
Volume
The heaviness of an object as the result of gravity is known as the ____
Weight
What is an atom?
Smallest part of a chemical element
What is a molecule?
A group of two or more chemically bonded atoms
What is an element?
A pure substance that can’t be divided into smaller parts
List the 4 main parts of daltons atomic model
- All matter is made of atoms
- All atoms of the same element are identical
- Atoms of different elements are different
- During chemical reactions, atoms separate, combine or rearrange to form new substances
What are elements located to the right of the step-like line called?
Non-metals
What are elements located the left of the step-like line called?
Metals
____ are elements possessing properties both of metals and non-metals
Metalloids
Why are substances like H2O and bronze not found on the periodic table?
Because they’re considered molecules since they have more than one element
(True/False) an atom is divisible
True
(True/False) an elements chemical symbol always starts with a lowercase
False
(T/F) an elements chemical symbol is the same in every language
True
(T/F) An elements chemical symbol always have 2 letters
False
(T/F) the periodic table sorts the elements based on their atomic number and their physical and chemical properties
True
(T/F) Hydrogen belongs to its own group. It’s a one of a kind element
True
(T/F) Molecules can be created by combining the same element or different elements
True
(T/F) all atoms of the same element are identical and have the same mass and properties
True
What does daltons atom model of H2O look like?
Two small circles of h with a big circle of O connecting them like a triangle
Why is dihydrogen called a molecule?
A molecule has 2 or more atoms, dihydrogen has two, meaning its a molecule
What is physical change? Are they reversible?
Transformation that doesn’t change the chemical composition or the characteristics of a substance. Considered reversible
Name 4 physical changes with an example for each
1) phase change(ice to water)
2) shape change(ripping paper)
3) preparing a mixture( adding food dye to icing)
4) separation of a mixture( using strainer to remove food from water)
What is a chemical change? Are they reversible?
Transformation that change chemical makeup of a substance, therefore altering its characteristic properties. Considered irreversible
What are the 5 indicators of a chemical change?
- Creation of gas
- Creation of solid
- Color change
- Change in temperature
- Emission of light
What are the 4 types of a chemical change with examples for each
- Synthesis(photosynthesis)
- Combustion(burning paper)
- Decomposition (cellular respiration)
- Oxidization(iron rusting)
Indicate whether it’s a physical or chemical change
Grinding ground pepper
Physical
Indicate whether it’s a physical or chemical change
Grinding ground pepper
Physical
Indicate whether it’s a physical or chemical change
Mixing sugar cubes with fine sugar
Physical
Indicate whether it’s a physical or chemical change
Mixing flour with water
Chemical
Indicate whether it’s a physical or chemical change
Baking cookies
Chemical
Indicate whether it’s a physical or chemical change
Baking cookies
Chemical
Indicate whether it’s a physical or chemical change
Ice melting
Physical
Indicate whether it’s a physical or chemical change
Oxygen and metal which creates rust
Chemical
Indicate whether it’s a physical or chemical change
Adding food colouring to water
Physical
Indicate whether it’s a physical or chemical change
Fireworks
Chemical
A glass of water sealed with a lid is put in the freezer. After it’s frozen, you remove the glass and noticed that the volume has decreased. Was matter lost? How would you explain it to someone to see if matter was lost?
Matter was not lost since it was sealed so nothing could escape. To tell measure the matter before and after.
