What is the formula of a compound formed from the ions M2+ and X3-?
a. MX
b. M3X2
c. M2X3
d. M6X6
b
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Which of the following is not a key line of evidence supporting the hypothesis that Mars once had abundant liquid water on its surface?
A) the canals of Mars mapped by Percival Lowell B) small, rounded pebbles found in places that look like dry riverbeds C) chemical analysis of minerals found in what appear to be ancient lakebeds D) the eroded rims of ancient craters
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 105 J/kg).
What will be an ideal response?
There are positive and negative magnetic charges, analogous to positive and negative electric charges
a. True b. False Indicate whether the statement is true or false
A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?
A) 9.8 A B) 2.5 A C) 1.2 A D) 4.9 A