Explain the answer and how you to round the answer with proper sig figs for the following

equation, 4389 / 28.7?

How many protons does a 17CI have

Alex saw a rusty old car in an abandoned lot. Because he had recently read about chemical reactions, he began to wonder how the rust formed. What happened to cause the rust on the steel car? A.

A solution has a hydronium concentration of 1.3x10^-3 M. what is the pH of the solution?

Write both the full balanced ionic equation for the following reaction and the balanced net ionic equation. what are the spectator ions if there are any? Equation: AgNO3 (aq) + GaCl3 (aq) - - > AgCl (s) + Ga (NO3) 3 (aq)

What is the mass of 3.91 x10^24 sulfur atoms?

Consider the model of the nitrogen atom. Which electron configuration matches this model? 1s22s22p2 1s22s22p3 1s22s22p4 1s22s22p5

In this experiment, you need to examine the idea of thermal energy transfer. Using a controlled experiment, .

What is the pressure of 2.3 moles of carbon dioxide gas stored in a 2 liter container at a temperature of 423 K? Given: a = 3.59 liters2 ∙ atmospheres/mole2, b = 0.0427 liters/mole, and R = 0.08205 liters∙atmospheres/K∙mole 37.22 atm 41.96 atm 79.

A bird is flying north at 18 m/s. A gust of wind from the North exerts an unbalanced force on the bird. What will happen to the bird's speed?

Calcium fluoride, CaF2, has a molar solubility of 2.1 x 10^-4 mol/L at pH = 7.00. By what factor does its molar solubility increase in a solution with pH = 3.00? The pKa of HF is 3.17 (A) 1.48 (B) 1.83 (C) 2.48 (D) 4.96