After 252 days, a 12.0-g sample of the radioisotope scandium-46 contains only 1.5 g of the isotope. what is the half-life of scandium-46

Which day of the year has the shotest period of day light in the northern hemesphiere A. the spring equinox B. the summer solstice C. the fall equinox D. the winter solstice

What do we call a substance that can act as both an acid and a base?

Which best describes Earth's magnetic field lines? The field lines go out of Earth near Antarctica, enter Earth in northern Canada, and are aligned with the geographic poles.

How many half-lives have passed if the amount of Parent Isotope is 12.5%?

Arrange the ionic compounds in order of increasing lattice energy: LiF, NaF, MgO, CaO Group of answer choices CaO < MgO < LiF < NaF LiF < NaF < MgO < CaO NaF < LiF < CaO < MgO NaF < LiF < MgO < CaO CaO < MgO < NaF < LiF MgO < CaO < LiF < NaF MgO <

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams

What would you use if you needed to determine the density of an object? balance and graduated cylinder balance and scale scale and spectroscope

What are two forms of friction that oppose the motion of a moving car

How are models related to theories and hypotheses