If a radioactive material has a 10 year half-life, how much of a 100 g sample will be left after 30 years?

A) 50 g

B) 6.25 g

C) 12.50 g

D) 25 g

What 2 groups can carbon bond with?

At most, how many bright fringes can be formed on one side of the central bright fringe (not counting the central bright fringe) when light of 625 nm falls on a double slit whose spacing is 6.77 x 10-6 m?

Chemical reactions are only able to occur in one direction. Chemical reactions are only able to occur in one direction. True False

The first movement of Vivaldi's "spring" has recurring theme called

What are some ideas for a compound machine for my middle school invention science project that can be useful in people's daily lives? I need a explanation of why it's important.

Electrons located in the outermost shell of an atom are called

Sentence for death rate

What two forces cause the arc-shape of projectile motion?

Why are some mystery elements easier to identify than others?

Which of the following processes is exothermic (heat or energy is released) ? A) ice melting in a beverage B) dry ice (solid CO2) converting to a gas at room temperature C) evaporation of water from a mud puddle D) burning propane in a barbeque