A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution?
A) distillation
B) filtration
C) either a or b
D) neither a nor b
A
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When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard and doesn't slip off, it is likely due to
A. inertia in motion. B. impulse. C. friction between his feet and the board. D. momentum change.
In shifting cultivation, five or more crops are typically cultivated in a single swidden
Indicate whether the statement is true or false
The United States spans ________
A) from the tropics to temperate zones B) the middle latitudes C) from the temperate zone to the arctic D) from the tropics to the arctic E) the entire range of the Northern Hemisphere
To promote the international trade development model, most countries have joined the ________
A) International Monetary Fund (IMF) B) The Organization for Economic Cooperation and Development (OECD) C) World Trade Organization (WTO). D) The United Nations (UN) E) International Bank for Reconstruction and Development (IBRD)