In a chemical reaction, what is the best description of a molecule’s movement when the temperature decreases?
A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?
The following chemical reaction occurs. 2H2O2 → 2H2O + O2 How many atoms of hydrogen are involved in the reaction?
Iron filings are thrown into a pile of sand. What is the best way to separate this mixture?
Which best represents a heterogeneous mixture?
Which substance is a compound?
When table salt (NaCl) is produced, which of the following BEST describes the actions of the sodium (Na) and chlorine (Cl) atoms?
How are the properties of elements related to the properties of the compounds they make?
Which element is the least reactive?
Why are certain elements placed into the same column on the periodic table?
Which of these is one similarity of the elements in the first group of the periodic table?
Which best describes how the current periodic table is arranged?
Which best describes elements found in a column of the periodic table?
Which best represents a physical property of a substance?
Which would provide the best evidence that a chemical reaction had occurred?
Which changes when gases condense to form liquids?
Which best represents a balanced equation?
Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
The construction of Hoover Dam on the Colorado River resulted in abundant fresh water and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?
Wind farms use turbines to generate electricity without using fossil fuels. What is one negative consequence of using wind turbines to generate electricity?
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