Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams. How old is the sample of calcium-51? 4.5 days 9.0 days 13.5 days 18 days

Explain the difference in polarity between co2 and h2o by referring to the polarity of the bonds and the shape of the molecules

In a Venn diagram, the separate circles contain characteristics unique to each compared and the intersection contains characteristics that are common to both items being compared. This Venn diagram compares the inner and outer planets.

Blood entering the lungs exchanges for oxygen

What are 2 ways acceleration can be changed?

In metals, the properties of malleability and ductility are explained by the fact that metallic atoms can ... A. roll past metallic bonds and form new bonds. B. roll over without breaking their bonds. C.

Describe the factors that form deep currents

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?