The initial mass of a radioisotope is 10.0 g. If the radioisotope has a half life of 2.75 years, how much remains after four half lives?

1. A rope is used to pull a metal box 20.0 m across the floor. The rope is held at an angle of 30.00 with the floor and a force of 525 N is applied. How much work does the force on the rope do?

Carla sees an equation that models a nuclear change. Superscript 2 Subscript 1 Baseline H + Superscript 3 Subscript 1 Baseline H yields Superscript 4 Subscript 2 Baseline H e + Superscript 1 Subscript 0 Baseline n Which nuclear process does the

Fluorine, chlorine, bromine, and iodine are part of a family called a. noble gases. b. metalloids. c. halogens. d. alkali metals.

Will you be my friend? A. Yes (Message me) B. No (Message me anyways) C. Maybe (Its a yes or no)

Which element is less reactive, an element who's atoms have seven valence electrons or an Element whose atoms have eight valence electrons? Explain.

One disadvantage of this type of power is that it still pollutes the air. biomass geothermal power hydropower solar power You want to create a new warming appliance that is safe.

A small rock remains at rest in outer space while an astronaut pushes horizontally on it with a force of 20 N. Which of the following must be true? A. There is another horizontal force acting on the rock. B.

If an igneous rock has very large crystals of minerals that you can see when looking at it, which type of igneous rock is it

You have a 60-foot roll of fencing and a large field. You want to make two paddocks by continuing the fencing down the middle of a rectangular enclosure. What are the dimensions of the largest such enclosure you can make?

Crystallization is a separation technique used to produce rock candy from a sugar solution. true or false