Complete and balance the following equations:
a. HNO3 + Ba(OH)2 ? ____________________.
b. H3PO4 + CaCO3 ? _____________________.
a. 2HNO3 + Ba(OH)2 ? 2H2O + Ba(NO3)2
b. 2H3PO4 + 3CaCO3
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An object of mass 8.0 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field
The spring stretches 3.6 cm before it reaches its equilibrium position. If this system is allowed to oscillate, what will be its frequency? A) 2.6 Hz B) 0.0045 Hz C) 0.67 Hz D) 2.1 Hz
A 0.140-kg baseball is dropped from rest from a height of 2.00 m above the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.280 kg?m/s B) 0.877 kg?m/s C) 0.439 kg?m/s D) 0.620 kg?m/s E) 1.37 kg?m/s
During a lunar eclipse the Moon's phase must be
A) 3rd quarter. B) 1st quarter. C) new. D) full.
A parallel-plate capacitor has a capacitance of 20 µF. What potential difference across the plates is required to store 22 × 10^-5 C on this capacitor?
a. 2.2 × 10^-2 V c. 11 V b. 1.4 × 10^-8 V d. 70 V