Balance these equations
________ Image (g) + ________ Image (g) ? ________ NImage (g)
A) 2, 2, 3
B) 2, 2, 5
C) 3, 3, 2
D) 3, 1, 2
Answer: D
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At what temperature is the rms speed of hydrogen molecules, H2, which have a molecular weight of 2.02 g/mole, equal to 2.0 km/s? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol
A) 17°C B) 51°C C) 68°C D) 72°C E) 34°C
The fundamental force that is the weakest of the four is
A. strong force. B. weak force. C. electromagnetic force. D. gravitational force.
As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon?
The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2. A) 0.0024 N B) 0.24 N C) 0.024 N D) 0.00024 N
Which of the following particles will repel one another?
A. a neutron and a negative ion B. a proton and an electron C. a negative ion and an electron D. a neutron and a neutron