Definitions
A lab instrument that measures the weight of an object with precision
What is an electronic balance?
When a wire is cut, and the material has not been changed into a new material, this is an example of what type of change?
What is a physical change?
the number of protons in the atom is represented by this
What is the atomic number?
Rust forming on iron is an example of this type of change.
What is a chemical change?
How close a measured value is to the true or accepted value of a quantity being measured
What is a accuracy?
When a cake is baked and the original substance becomes something entirely different, this type of change has occurred.
What is a chemical change?
atoms of the same element with different numbers of neutrons
What is an isotope?
the number of protons and neutrons in an atom is represented by this
What is mass number?
This phase change occurs when a liquid becomes a gas at its boiling point.
What is vaporization?
Any atom with a positive charge
What is a cation?
A blend of chicken and broth is an example of this, while pure water is an example of what?
What is a mixture and a pure substance?
An atom has 15 protons, 16 neutrons, and 13 electrons. It has what charge and is it a cation or anion.
What is +2 and cation?
elements on the left side of the periodic chart that tend to lose electrons easily
What are metals?
This type of reaction absorbs heat from its surroundings, such as melting ice.
What is an endothermic reaction?
vertical column of elements that have similar chemical properties
What is a group?
A cup of salt water is an example of what type of mixture, while dirt is an example of what other type of mixture?
What is homogeneous and heterogeneous mixtures?
The octet rule states that this amount of electrons fill the outermost energy level.
What is 8?
Elements in group 7
What are halogens?
This technique separates solids from liquids using a porous barrier, such as coffee grounds in a filter.
What is filtration?
a physical property of a system that does not depend on the system size or the amount of material in the system (e.g. boiling point, temperature, and luster)
What is intensive property?
This property that varies with the amount of the substance and include mass, weight, and volume. This property, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity.
What is extensive and intensive properties?
Clue: The average atomic mass of an element with two isotopes: one with a mass of 10.0 amu (90.% abundance) and one with a mass of 11.0 amu (10.% abundance).
What is 10.1 amu?
Elements in group 1
What are alkali metals?
A cube has a mass of 50 grams and a volume of 25 milliliters. Its density is this value.
What is 2 g/ml? (sig figs must be accurate)