Calculating Volume and Density
The formula used to calculate the density of an object.
What is Density = Mass divided by Volume? D=M/V
Solubility, magnetism, and boiling point are all examples of this type of property.
What are physical properties?
The number of different elements present in a molecule of Sulfuric Acid (H2SO4).
What is three? (Hydrogen, Sulfur, and Oxygen)
A group of two or more atoms held together by chemical bonds.
What is a molecule?
The amount of "stuff" or matter in an object, usually measured in grams.
Answer: What is mass?
This is the density of a 50g cube that has a volume of 10cm³.
What is 5 g/cm³?
This type of property describes a substance's ability to change into a completely new substance, such as flammability.
What is a chemical property?
The total number of atoms found in one molecule of Methane (CH4).
What is five?
In a "ball-and-stick" model, the "sticks" represent this.
What are chemical bonds?
This measurement changes depending on the pull of gravity.
What is weight?
This method is used to find the volume of an irregular object, like a jagged rock, by dropping it into a graduated cylinder.
What is water displacement?
Determining if an apple turning brown is a physical or chemical change.
What is a chemical change? (Oxidation)
In the formula 2H2O, this is the point of the small "2" after the Hydrogen.
What is the number of hydrogen atoms?
This common molecule consists of one Carbon atom and two Oxygen atoms.
What is Carbon Dioxide?
The smallest unit of an element that maintains the properties of that element.
What is an atom?
An object has a mass of 20g and a density of 2 g/mL. This is its volume.
What is 10 mL?
List two signs (evidence) that a chemical change has occurred during an experiment.
What are gas production (bubbles), unexpected color change, temperature change, or formation of a precipitate?
This type of substance is made of only one type of atom, even if those atoms are bonded together like O2.
What is an element?
The term for a solid where atoms are arranged in a highly ordered, repeating 3D lattice.
What is a crystal (or extended structure)?
A substance made of two or more different elements that are chemically combined.
What is a compound?
If an object has a density of 0.8 g/cm³, explain whether it will sink or float in pure water.
What is float? (Because its density is less than 1.0 g/cm³, the density of water)
Explain why a phase change (like ice melting) is considered a physical change rather than a chemical one.
What is because the chemical composition ($H_2O$) stays the same?
The number of Oxygen atoms in the following formula: Al2(SO4)3.
What is 12?
True or False: In a simple molecule, the atoms are always from different elements.
What is False? (Example: O2 or H2)
Explain the difference between a molecule and a compound.
What is all compounds are molecules, but not all molecules are compounds?