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There are three isotopes of an element with the following percent abundances; 20X = 19.992 amu (90.51%), 21X = 20.993 amu (0.27%), 22X = 21.991 amu. What is the average atomic mass in amu of X? Show your work and give your answer to 2 decimal places.

The fictional element Chaffium (symbol Ch) makes two oxyanions: ChO3¯ and ChO4¯ What would be the name of ChO4¯? Explain your reasoning. Note: The fictional element name is a Latin word that ends with -ium like many real elements. Just use the same rules as you would with a real element name.

Determine the mass in grams of [x].65 × 10²¹ atoms of barium.

For the reaction CaCO3(s) + 2 HCl(aq) →  CaCl2(aq) + CO2(g) + H2O(l) If 78.1 g solid CaCO3 is mixed with 51.6 g HCl. Which one will be the limiting reactant? Show your work and explain your reasoning.

For the reaction 2 S (s) + 3 O2(g) → 2 SO3(g) If 6.3 g of S is reacted with 10.0 g of O2. Which one will be the limiting reactant? Show your work and explain your reasoning.

What is the correct order of blood to the left upper limb?  

During a colonoscopy, the scope is inserted in reverse order from the anus. As the doctor advances the scope, which of the following structures will be encountered immediately after the rectum?

If the position of an object is plotted vertically on a graph and the time is plotted horizontally, the instantaneous velocity at a particular time is

A small lead ball is thrown directly upward. Neglect any effects due to air resistance. Which of the following statements are Not true? (Select all that apply.)

A particle is moving at constant velocity. Its position at t = 1.0 s is 3.0 m and its position at t = 4.0 s is 15.0 m. What is the slope of the position-time graph for this particle