Potassium-40 has a half-life of 1.277 x 109 years. After 1.022 x 1010 years, how much potassium-40 will remain from a 500.3-g sample?

A. approximately 1.95 g

B. approximately 3.91 g

C. approximately 62.54 g

D. approximately 71.47 g

Weather ionic or covalent, what does bonding always involve?

What property of Granite makes it useful for making roads

Which option is the most accurate description of speed? A: The dog ran around the block in eight minutes B: The plucked guitar string vibrated at least 50 times C:The goalie quickly moves left to block the goal D: The hare finish the race before the

20. Rank the states of matter from slowest to fastest particle speed.

Compare fission and fusion reactions and explain the difference between their energy input and output.

Which topic is commonly used to explain activation energy and how chemical reactions happen A. reaction rate B. Collision theory C. Velocity distribution D. Spontaneous reaction

Calculate the density of a rectangular solid that has a mass of 25.71 g, and its dimensions are 2.3 x 4.01 x 1.82 cm.

When the metal sample reacts with acid, the gas evolved will be collected over water; the gas is said to be "wet".

Solid iron (II) sulfide reacts with aqueous hydrochloric acid HCl to produce hydrogen sulfide gas H2S and aqueous iron (II) chloride.

How are mixtures compounds and elements alike?