Elements, Compounds, and Mixtures
What is the definition of an element
Only 1 type of atom
If the mass of the products of a chemical reaction are 10 grams, what was the mass of the reactants that reacted?
10 g
What separation technique would be used to separate the pigments of ink
chromatography
What type of change is a phase change?
physical
In order to be classified as matter, something must have _________________ and ________________
mass and volume
What types of matter exist as pure substances
Elements and compounds
If 10.0 g of water completely decomposes to form 7.0 grams of oxygen gas, how much hydrogen gas should also be produced?
3.0 g
Are chemical or physical properties used to separate the components of a mixture
Physical
Intensive
True or false: whenever bonds are broken or formed, a chemical change is taking place
True
How many capital letters in the formula of an element
1
If 10.0 g of ice sublimes to form steam, what will be the mass of the steam
10.0 g
What technique would be used to separate a homogeneous mixture of two liquids with different boiling points
Distillation
What type of change occurs when you place a beaker of water on a preheated hot plate, and gaseous water forms
Physical change
Which state of matter is the most compressible
What is the definition of a mixture
Different types of matter physically combined
What is the definition of the law of conservation of matter
Matter cannot be created or destroyed during a chemical reaction, instead it is conserved
If rice, salt, and water were all mixed together, how would you separate them out
1) Pour salt water through filter - anything dissolved will pass through filter with water, now rice is separate
2) Evaporate off the water so that salt and water are separate
An unexpected temperature change indicate what type of change
What does temperature measure?
The average kinetic energy the the atoms/molecules in a sample
Draw a mixture of an element and a compound with at least five particles
Element = only 1 type of atom
Compound = 2+ atoms chemically bonded
The different particles should be mixed together in drawing
Draw 2 molecules of Sq2T decomposing into T2 and Sq2. Make sure your drawing abides by the law of conservation of matter
Drawing should include:
2 molecules of Sq2T
1 molecule of T2
2 molecules of Sq2
Filteration
What type of change does dissolving represent?
Physical change
Draw and label a molecule of an element and a molecule of a compound
Molecule of an element must be 2+ atoms bonded together that are the same type, molecule of a compound must be 2+ atoms bonded together that are different