Unit 1
Is the melting of an ice cube a chemical or physical change?
Physical change
What is the density of water?
1
Which scientist uses the cathode ray?
JJ Thompson
Does the atom size get bigger as you go up or down?
Composed of cations and anions
Is a chocolate chip cookie a homogenous or heterogenous mixture?
Heterogenous
Convert 25.5 milliliters to centimeters
2.55
Which scientist was a former teacher?
RoBert A. Milikan
Is an anion positive or negative?
An anion is a negatively formed charge
is group 15, 16, 17 positive or negative?
Negative
A proposed explanation for an observation
Convert 1300 kilograms to meters.
1,300,000
What is the cathode ray?
A green glowing beam that is deflected by electrically charged metal plates.
Find the number of valence electrons in Lithium
1
What is a binary compound?
Composed of two elements
What are the 4 signs of chemical change?
1. Transfer of energy
2. Change of color
3. Production of gas
4. Formation of precipitation
Find the prevent error:
A student calculates the mass of a cube to be 16.74 grams, while the correct answer is 18 Grams.
7%
What is the Bohr model?
To change Rutherford’s model to incorporate newer discoveries about the energy of an atom.
What is the name of group 1 and 2 on the periodic table?
Akali metals and Alkaline earth metals
What is the octet rule?
combined atoms that require a total of eight electrons or an octet by sharing electrons.
What are the 3 ways to separate mixtures?
1. Filtration
2. Physical separation
3. Distillation
What is the order of the metric system?
Kilo, Hecto, DeKA, meter: liter: gram, deci, centi, milli
How to find the number of neutrons?
Mass number - atomic number
What group numbers are transition elements?
3-12
What are covalent bonds?
Bonds that involve two shared parts of electrons.