1. What is the answer to the following expression in the correct number of significant figures?

(0.1245) x (0.00003) x (298,000) / (2.0 - 1.5)

What is a diagnostic characteristic of a mineral used to make a cement slab in your house?

Current atomic models show an atom's nucleus surrounded by electron clouds. An electron cloud is a region around an atom's nucleus where an electron is likely to be. Which of the following is a limitation of current atomic models? A.

A (g) + 2B (g) → C (g) + D (g) If you initially start with 1.00 atm of both A and B and find that at equilibrium 0.211 atm of C is present, what is the value of Kp for the reaction at the temperature the reaction was run?

What mass of helium, in grams, is required to fill a 6.1-l balloon to a pressure of 1.1 atm at 25 °c?

When nitrogen and tin (sn4+) form an ionic compound, what is the formula? n3sn4 sn4n3 sn3n4 n4sn3?

Planet X is a planet in our solar system. Planet Y is a dwarf planet. Identify their characteristics.

3/4 / 100 as a decimal and a percentage?

What is the net ionic equation for AgNO3 (aq) + Na2SO4 (aq)

What does it take to prove a hypothesis false? O A. It is impossible to prove a hypothesis false O B. At least ten examples O C. One counterexample O D. A poorly stated question

We dissolve 5g of sugar, C12H22O11, in water to make 1L solution. What is the concentration of this solution expressed as molarity.