Matter & Changes
Which is a physical change: freezing water or burning paper?
What is freezing water?
Convert 3.6 kilometers to meters.
What is 3,600 m?
Which subatomic particle has a negative charge?
What is an electron?
Vertical columns on the periodic table are called what?
What are groups (families)?
Which type of radiation has the lowest penetrating power?
What are alpha particles?
Saltwater is classified as what type of mixture?
What is a homogeneous mixture?
Which metric unit is larger: centimeter or millimeter?
What is centimeter?
The atomic number tells you the number of what particle?
What are protons?
Which group number contains the noble gases?
What is Group 18?
Which nuclear particle is an electron?
What is a beta particle?
Which property is physical: density or flammability? And is that an intensive or extensive property?
What is density? And what is intensive?
How many significant figures are in the number 0.00450?
What is 3?
Isotopes of an element differ in the number of what particle?
What are neutrons?
Which type of element is found along the zigzag line?
What are metalloids?
Gamma rays are best described as what?
What are electromagnetic waves?
Rust forming on iron is an example of what type of change?
What is a chemical change?
Convert 450 milligrams to grams.
What is 0.450 g?
An atom has a mass number of 40 and 20 protons. How many neutrons does it have?
An atom has a mass number of 40 and 20 protons. How many neutrons does it have?
Why do elements in the same group have similar properties?
What is they have the same number of valence electrons?
Solve this nuclear equation.
23892U → 42 He + ______
23490Th
Why is melting wax considered a physical change?
What is because no new substance is formed?
The mass of an object is 62.30 g. Lab groups record the mass to be 59.87 g, 59.92 g, and 58.99 g. How would you describe these results in terms of accuracy and precision?
Both accurate and precise.
There are two primary isotopes of Chlorine. 75.8% is Cl-35 and 24.2% Cl-37.
What can you tell me about the average atomic mass, and what can you tell me about the number of protons and neutrons in the isotopes?
The average atomic mass will be closer to 35 because of the higher percentage.
Both isotopes have the same number of protons.
The isotopes have the same number of neutrons.
Which element would be least reactive: Ne, Na, or Cl?
What is Ne (Neon)?
What are 3 things that happen during a nuclear reaction?
1- the nuclei change in numbers of protons and neutrons
2- a lot of energy is released
3- the nucleui becomes more stable