Matter
Which of the following is made of ONLY a single element?
A. a diatomic molecule B. a compound
C. a mixture D. a sample of soil
A. a diatomic molecule
How many places should you estimate after the last known value when taking a measurement?
A. 0 B. 1 C. 2 D. 3
B. 1
Which one of the following scientists did NOT contribute to atomic theory?
A. Dalton B. Thomson C. Einstein D. Rutherford
C. Einstein
What statements describes the distribution of charge in an atom?
A. A positively charged nucleus surrounded by mostly empty space
B. A negatively charged nucleus surrounded by positively charged particles
C. A negatively charged nucleus surrounded by mostly empty space
D. A positively charged nucleus surrounded by positively charged particles
A. A positively charged nucleus surrounded by mostly empty space
Atomic radius increases down a group because
A. Electrons are added
B. Orbitals are added
C. Protons are added
D. The elements get more unstable
B. Orbitals are added
Two grams of Potassium Chloride completely dissolve in a sample of water. This solution is classified as:
A. An element B. A homogenous mixture
C. A heterogenous mixture D. A compound
B. A homogenous mixture
Which mass contains 4 sig figs?
A. .0024 grams B. 1003 grams
C. 3870 grams D. .0432 grams
B. 1003 grams
Which statement describes the earliest model of the atom?
A. An atom is an indivisible hard sphere.
B. An atom has a small, dense nucleus.
C. Electrons are negative particles in an atom.
D. Electrons in an atom have wave-like properties.
A. An atom is an indivisible hard sphere.
Compared to the entire atom, the nucleus is
A. Smaller and contains most of the atom's mass
B. Larger and contains most of the atom's mass
C. Larger and contains little of the atom's mass
D. Smaller and contains little of the atom's mass
A. Smaller and contains most of the atom's mass
Ionization Energy and Electronegativity both relate to attraction between which 2 particles?
A. Electrons and neutrons B. Protons and neutrons
C. Electrons and protons D. Neutrons and orbitals
C. Electrons and protons
Which substance can be broken down by chemical means?
A. Ca B. Cu C. CO D. Ce
C. CO
When calculated density, mass is measured as 10.04 grams and volume is measured at 8.21 mL. How many sig figs should be in your final answer?
BONUS: What is the density of the object?
3
BONUS: 1.22 g.mL
Which electron configuration represents the electrons in an atom of sulfur in an excited state?
A. 2–8–6 B. 2–8–7 C. 2–7–7 D. 2–7–8
C. 2–7–7
As a result of the gold foil experiment, it was concluded that an atom
A. contains a small, dense nucleus
B. contains protons, neutrons, and electrons
C. is a hard indivisible sphere
D. has positrons and orbitals
A. contains a small, dense nucleus
Which element has metallic bonds at room temperature?
A. bromine B. krypton C. cesium D. sulfur
C. cesium
What type of bond is most likely to dissolved in water because it is formed from the steal of electrons rather than the sharing?
Ionic bond
A sample of helium gas in a sealed, rigid container is at 240. K and 120. kPa. The temperature is increased to 360. K.
State the number of significant figures to which the given pressure is expressed.
3
State the number of electrons in each shell of a N-14 atom in the ground state.
2-5
Braw a Lewis dot structure for a molecule of Cl2.
Teacher discretion
Compare the first ionization energy of Argon to the first ionization energy of Helium.
Draw a diagram representing a heterogenous mixture.
Teacher discretion
Write the equation for % error.
(Actual - Anticipated)/(Anticipated) x 100
Tritium, hydrogen-3, is a radioisotope. State the number of neutrons in an atom of tritium.
2
Draw a Bohr model for Selenium.
Teacher discretion.
Order the following elements from smallest to largest atomic radius:
Mn, Te, Li, Po, O
O, Li, Mn, Te, Po