How much of a substance is there after 42 days if there were 10 grams of a substance that decays with a half-life of 14 days? A. 1.25g
B. 2.50g
C. 3.13g
D. 6.25g

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond

Freya built a model of the earth, sun, and moon. freya can cause her model to move in three different ways. she can turn the crank to model how the earth revolves around the sun, she can spin the globe to model how the earth rotates on its axis, and she can push the moon with her fingers to model how the moon revolves around the earth. how could freya best use her model to demonstrate the cause of the day/night cycle on earth?