How might you tell whether or not your toothpaste contained either calcium carbonate, CaC 03, or baking soda, NaHC 03, without looking at the ingredients label?
A) if the toothpaste bubbles when heated
B) if the toothpaste bubbles when added to ammonia, such as window cleaner
C) if the toothpaste produces a salt (NaCl) when added to HCl
D) if the toothpaste bubbles when added to vinegar
Answer: D
You might also like to view...
A 15-kg mass, attached to a massless spring whose force constant is 2500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33
A catcher arranges to catch a baseball dropped from a height 50 m above his glove. However, his friends substitute a soft 250 g red grapefruit, so that it will smash apart when he catches it. His glove stops the grapefruit in 0.010 s. What force does the glove exert on the grapefruit?
A. 0.078 3 N B. 783 N C. 2 450 N D. 24 500 N E. 78 300 N
A satellite is in circular orbit at an altitude of 1500 km above the surface of a nonrotating planet with an orbital speed of 9.2 km/s
The minimum speed needed to escape from the surface of the planet is 14.9 km/s, and G = 6.67 × 10-11 N ? m2/kg2. The orbital period of the satellite is closest to A) 72 min. B) 65 min. C) 58 min. D) 51 min. E) 44 min.
The Sahara in northern Africa is an example of a
A) rain shadow desert on the downslope of a large mountain range. B) cold ocean current desert formed by local winds coming off cool ocean areas. C) horse latitude desert formed by Earth's tradewinds. D) subtropical desert formed when tropical areas are overwhelmed by sand.