Level 6
The number of electrons in a neutral atom is equal to its what?
Protons
To find how many grams are in 3.05 moles of Calcium, what conversions would I need to use?
Molar mass
66.7 mL of 18.0 molar sulfuric acid solution was dissolved in enough water to make 500 mL of solution. The molarity of the diluted mixture is
2.40 molar
A compound is always ______ whereas a mixture is
C. Homogenous, both homogenous and heterogenous
How much heat does an aluminum block absorb if 10.00 grams is heated from 25.0oC to 50.0oC? *Specific heat of aluminum is 0.900 J/goC
3150 J
Sodium atoms and sodium ions
Water has a density of 1. What should be the unit?
g/mL
According to the kinetic theory of gases, the average kinetic energy of the gas particles in a gas sample is directly proportional to the
Temperature
When the reactants contain more potential energy than do the products:
C. The energy is released
What was JJ Thomson big discovery?
Electrons
Which of the following statements concerning the atom is false?
A. Chemical reactions involve only the electrons.
B. The atom contains protons, neutrons and electrons.
C. Protons are found in orbits about the nucleus.
D. The nucleus contains both protons and neutrons.
E. Most of the mass of the atom is found in the nucleus
C
What are two different units that volume is measured in?
cm3 and mL
Dry ice is solid carbon dioxide, or CO2. Dry ice may be used as a cooling agent and contains two oxygen atoms bonded to a carbon atom. Dry ice is a ___________________ .
Pure substance
Which of the following reactions are exothermic reactions?
D. All of the above
A. Combustion of methane
Which combination below corresponds to a cation with a +1 charge?
A. 7 protons and 8 electrons
B. 11 protons and 10 electrons
C. 18 protons and 18 electrons
D. 17 protons and 18 electrons
E. 20 protons and 18 electrons
B
Which has more mass? 2 moles of Iron (Fe) or 2 moles of Zinc (Zn)?
2 moles of Zinc
Nickel has the chemical symbol Ni and atomic number 28. It is a silvery-white metal and cannot be broken down physically or chemically into a more simple substance. Nickel is a ___________________ .
Element
What are chemical reactions that absorb energy?
Endothermic
What is the molecular mass of Sulfur dioxide (SO2)?
64g
6.02 x 1023 represents the number of atoms in 1 ____.
Moles
In the lab, Jacob is using a substance that has a chemical formula and contains two different elements. Maya’s substance is a(n) _______ .
A. element
B. compound
C. heterogeneous mixture
D. homogenous mixture/solution
B. Compound
The heat required to raise the temperature of a SUBSTANCE by 1∘C
Specific heat