WorksheetsChemistry Challenge Round 4
Total questions: 13
Worksheet time: 21mins
The earth's core contains liquid nickel and iron at temperatures greater than 4,000 degrees Celsius. What must be true of pure liquid nickel in the earth's core compared to pure liquid nickel made in a factory?
I. They have the same freezing point
II. They have the same number of protons in each atom
III. They react the same
II only
I and II only
I and III only
I, II, and III
Dmitri Mendeleev created the first modern periodic table, shown on the side, in the late 1800s. How did Mendeleev predict the existence of elements that hadn't been discovered yet?
He discovered the structure of atoms
He organized the elements based on patterns of reactivity
He related atomic number to the charge of an atom's nucleus
He used X-rays to measure atomic numbers
Silver chloride, AgCl, is a temperature-stable lightweight solid that darkens in sunlight. As a result, AgCl is used in glasses that darken in bright light. What chemical property of AgCl explains its use in glasses?
It does not dissolve in water
It reacts to form Ag and Cl atoms in UV light
Its density is 5.56 g/cm^3
Its melting point is 455 degrees Celsius
A ball is rolling down a hill. What type of energy is the ball gaining?
I. Kinetic energy
II. Mechanical energy
III. Potential energy
I only
III only
I and II only
II and III only
Element X reacts similarly to oxygen and has the same number of electron shells as silicon. Based on rows two and three of the periodic table, shown on the side, what is element X?
Boron
Carbon
Nitrogen
Sulfur
A beam of particles passes between two electrically charged plates. One plate is positively charged and the other plate is negatively charged. The beam travels toward the positive plate, as illustrated in the image on the side. Which particles would be present if the beam bent toward the negative plate?
Anions
Cations
Electrons
Protons
Which of the objects on the side can hold 3/5 liter of liquid?
I and II
III and VI
V only
IV only
Which of the following groupings of 3 phase changes can be described as all endothermic?
condensation, deposition, and freezing
condensation, melting, and vaporization
melting, boiling, and sublimation
melting, freezing, and sublimation
An electron configuration describes the number and location of the electrons in an atom. Which is a possible term in an electron configuration?
1s4
2p4
5p15
6d21
Copper (element 29) is a precious metal which can be found in northern Michigan. Copper forms two ions Cu+ and Cu2+ . Which copper particle has the highest atomic mass number?
Cu
Cu+
Cu2+
All have the same atomic mass number
Water displacement is a method of measuring the volume of an irregular object. The image to the left shows a graduated cylinder both before and after a bolt is added. Which value is the best approximation of the volume of the bolt?
26 mL
30 mL
180 mL
200 mL
When a shipment of a chemical arrives, it comes with a safety data sheet (SDS) in the box. What information will not be found on the SDS?
The price of the chemical
Safe disposal information
Storage and handling precautions
Physical and chemical properties of the product
The atomic structures of four different atoms are shown below. Which atoms are isotopes of each other?
I. Atom 1 - 6 electrons, 6 neutrons, and 6 protons
II. Atom 2 - 6 electrons, 7 neutrons, and 6 protons
III. Atom 3 - 6 electrons, 8 neutrons, and 6 protons
IV. Atom 4 - 8 electrons, 8 neutrons, and 8 protons
Atoms 1 and 2
Atoms 1, 2, and 3
Atoms 3 and 4
Atoms 2, 3, and 4
