What phase change occurs when a solid changes directly into a gas?
What is sublimation.
100
Where are protons located in the atom?
What is in nucleus.
100
What is the density of a piece of silver that has a mass of 210g and a volume of 20mL? D = M/V
What is 10.5 g/mL
100
Where are electrons located in the atom?
What is outside nucleus.
100
Which state of matter does not have a definite shape or volume?
What is gas
200
An isotope of chlorine has 17 protons and 19 neutrons.What is its mass number?
What is 36 (mass number = protons + neutrons)
200
Cutting a piece of wood is this type of change.
What is physical.
200
During the process of melting (phase change), what happens to the temperature of a substance?
What is stays the same.
200
An unknown gas turns iron filings brown. The gas condenses to a liquid at 183*C. Which one is a chemical property?
What is turning iron brown (chemical reaction)
200
Is salad a homogeneous or heterogeneous mixture? Assume it has several ingredients.
What is heterogeneous (each sample is different)
300
Where are protons located in the atom?
What is nucleus.
300
Particles are in contact with one another, but they are able to slip past one another. Which phase of matter is this?
What is liquid.
300
Why do atoms of elements have neutral charges?
What is positives and negatives balance each other out.
300
The smallest particles of an element that has all the properties of the element is called
What is an atom.
300
The density of aluminum is 2.70 g/mL/ A piece has a volume of 54mL. What is its mass? (**CORRECTED**)
What is density = mass/volume Mass = density * volume
2.70*54 = 145.8g
400
Which shape of matter is characterized by neutral particles that have no definite volume and take the shape of the container into which they are placed?
What is gas (no specific shape OR volume)
400
The heaviest subatomic particle(s)
What is neutron & proton
400
Atoms of the same element have this number in common
What is atomic number AND number of protons.
400
The lightest subatomic particle(s)
What is electron
400
You pour two liquids into a container. One has a low density and the other has a high density. Which liquid is on top, and which is on bottom (assume they do not mix).
What is low density on top (floats), high density on bottom (sinks)
500
Using the element on the board (K), how many protons, neutrons, and electrons does it have?
What is 19 protons (atomic number), 19 electrons (to make it neutral charge), 20 neutrons (mass - atomic)
500
When copper reacts with oxygen in the air, a color change takes place, and the metal changes from reddish brown to green. The green color has a different chemical composition from copper. Is this a chemical or physical change?
What is chemical.
500
On the element K (see board), what is the element's name, atomic mass, and atomic number?
What is potassium, 19 atomic number, 39.098 atomic mass.
500
Burning paper is this type of change.
What is chemical.
500
List 3 subatomic particles and their charges and locations.
What is proton (+), in nucleus. Electron (-), outside nucleus. Neutron (neutral), in nucleus.