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Gold is alloyed (mixed) with other metals to increase its hardness in making jewelry. (A) Consider a piece of gold jewelry that weighs 9.85 g and has a volume of 0.675 cm3. The jewelry contains only gold and silver, which have densities of 19.

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A tissue sample at 275 K is submerged in 2 kg of liquid nitrogen at 70 K for cryopreservation. The final temperature of the nitrogen is 75 K. What is the heat capacity of the sample in J/K

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Which statement is false? 1. Lone pairs of electrons repel each other more strongly than they repel bonding pairs. 2. Lone pairs of electrons repel each other more strongly than bonding pairs repel each other. 3.

Increasing the temperature increases the rate of a many reactions by:

2A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP? A. 22.4 moles B. 1.12 moles C. 0.0446 moles D. 0.893 moles E. 1.23 moles F. 4.55 moles

1. Which has a larger radius Ca atom or Ca+2 ion? 2. Which has a greater radius F atom or F - ion? 3. Which is the correct way of understanding the trend for Ionic radius Vs. Atomic radius?

For which of the following activities might you want to hire a chemist? A. examining the structure of plant cells B. building a fence C. building a wood storage shed D.

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