If 1/8 of an original sample of krypton-74 remains unchanged after 34.5 minutes, what is the half life of krypton-74?

What is the mass in grams of na 2 co 3 (s) (molar mass = 105.98 g/mol) that, when dissolved in 125 ml of water, will make a 0.15 m aqueous solution?

Which of the following pairs of objects could have a magnetic force acting between them? A. A block of wood and a metal spoon B. Two metal spoons C. Two blocks of wood D. A metal spoon and a glass cup

Is burning a physical or chemical property?

How does an atom become a positively charged ion? A. by gaining one or more electrons B. by gaining one or more neutrons C. by losing one or more electrons D. by losing one or more neutrons

How many neutrons are in a silicon atom?

Which of the following are physically properties of a penny

Complete the following statements about the functions of the digestive system. The starts an involuntary swallowing action when it senses food. The squeezes food down the digestive tract by an involuntary synchronized muscle movement called.

Explain how thermal energy is transferred through convection.

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?

Which cluster in the agriculture industry would be most likely to partner with the animal systems cluster to introduce new modern procedures to animal careers