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Science REVIEW Chemistry
Quiz by TIFFANY SOLOT
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​Kevin is drawing a model of an atom. What should he draw in the nucleus of the atom shown here in order to make it uncharged?
10 Protons
8 Protons
2 Protons
5 Protons
​Imagine that this dartboard is an atom. Which dart indicates where the valence electrons are located?Â
Dart D
Dart B
Dart A
Dart C
Kevin is drawing a model of an atom. What should he draw in the nucleus of the atom shown here in order to make it uncharged?
Imagine that this dartboard is an atom. Which dart indicates where the valence electrons are located?Â
A model of an atom is shown. Â What is the mass of this atom?
You make yourself a piece of toast before leaving for school in the morning. What energy transformations are involved in making a piece of toast?
Atom A has 11 protons, 12 neutrons, and 10 electrons. Atom B has 11 protons, 13 neutrons, and 10 electrons. Which statement is correct?
Which of the following is a chemical property of a substance?
Elements with seven valence electrons —
The table below lists elements and their number of valence electrons. Â Which lists these elements from most reactive to least reactive?Â
A unit of cesium oxalate has two atoms of cesium, Cs, two atoms of carbon, C, and four atoms of oxygen, O. What is the correct way to write the chemical formula for cesium oxalate?
Sulfur is a nonmetal. Of the following, the physical characteristic that is most likely to describe a sample of sulfur is —
Part of the periodic table of elements is shown here. According to the table, which element would you expect to have the most metallic properties?
The atomic mass of fluorine is 18.998. The atomic mass of cadmium is 112.411. Why do the atomic masses of elements include decimals?
A compound has the chemical formula NaHCO3. How many elements make up one molecule of this compound?
This chemical equation describes one cause of acid rain: 3NO2 + H2O → 2HNO3 + NO How many atoms of oxygen are indicated by 2HNO3 in this reaction?
Which of the following is the best clue that a chemical reaction has taken place?
Which of the following is always true of a chemical reaction?
Look at the pictures above. "A" shows the closed bag before the vinegar and baking soda are mixed together, and "B" shows it still closed after they are mixed together. In which picture do the contents of the bag have the greater mass?
Which equation represents a reaction that has the same amount of mass before and after the reaction?
What is the formula for dinitrogen monoxide, also called nitrogen (I) oxide, or nitrous oxide?
An atom has a mass number of 65 and an atomic number of 30. What can you conclude about the atom?