Matter/Properties of Matter
True or False: A mixture can be separated by physical means.
What is true?
The weighted average mass of all isotopes of an element.
What is atomic mass?
Accuracy describes how close a measurement is to this.
What is the true or accepted value?
How many valence electrons does Be have?
What is 2 valence electrons?
Convert 500 m to km
What is 0.5 km?
Volume is an example of an intensive or extensive property? Give the definition of either in your answer.
What is extensive, because those properties are dependent on the amount of matter present?
Carbon-14 has how many neutrons?
What is 8?
A student runs three trials and gets: 2.11 g, 2.10 g, and 2.12 g. The actual value is 2.55 g. Describe the data: accurate, precise, or both?
What is precise but not accurate?
What is the maximum number of electrons that can fit in the second shell (n=2)?
What is 8?
Convert 8.2 mm to hm. (Put in scientific notation)
What is 8.2 x 10-5 hm?
Classify each as a physical or chemical property: Flammability, density, and melting point
What is flammability=chemical, and density & melting point=physical?
This scientist's model described electrons orbiting the nucleus like planets around the sun.
Who is Niels Bohr?
180+172
What is 350?
The subshell that holds a maximum number of 10 electrons.
d subshell
How many seconds are in 2.5 days? (60 seconds = 1 minute, 60 minutes= 1 hour, 24 hours = 1 day)
What is 216,000 seconds?
Is boiling water a physical or chemical change? Explain your answer
Give the number of protons, neutrons, and electrons for N3-
What are 7 protons, 7 neutrons, and 10 electrons?
19.19/(56.30-53.20)
What is 6.19?
What is the main difference between the Bohr models and lewis structures?
What are Bohr models display all electrons (including core electrons), whereas Lewis just shows the valence electrons?
A rectangular box has a volume of 2.5 L. What is the volume in cm3? (1 mL= 1 cm3)
What is 2500 cm3?
Classify the following: steel, chocolate chip cookie, NH3, CH4, and iron.
What is homogenous mixture, heterogenous mixture, compound & molecule, compound & molecule, and element?
What is because some alpha particles were deflected, showing a dense positively charged nucleus?
Write 0.00089050 in scientific notation.
What is 8.9050 x 10-4?
The quantum mechanical model introduced this concept of regions where electrons are likely to be found.
What are orbitals?
Using dimensional analysis, convert 7.1 g/mL to kg/m3. (Note: 1 cm3=1 mL)
What is 7.1 x 103 kg/m3?