19) Which if the following is a heterogeneous mixture?

a. Air

b. Steel

d. Soil

4. How many J of energy are needed to raise the temperature of 165 g of water from 10.55°C to 47.32°C?

What is Oxygen an example of? 1,2,3 or 4? 1. plasma. 2. gas. 3. liquid. 4. solid.

What is the molarity of a solution of kno3 (molecular mass = 101 that contains 404 grams of kno3 in 2.00 liters of solution? a 1.00 b 2.00 c 0.500 d 4.00?

HCI+CaCO3=CaCl2+H2O+CO2

A compound of iodine and cesium contains 63.94 g of metal and 61.06 g of nonmetaL How many grams of cesium are in 38.77 g of compound? How many grams of iodine?

Read the two questions. Question 1: Should acid precipitation be a concern for the new age environmentalist? Question 2: Does acid precipitation in forests affect the reproduction rate in birds?

How is excitation in spectroscopy brought about

What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water bath in a chemistry lab?

What does the electron cloud model describe A. Rapidly moving neutrons B. Rapidly moving protons C. A standing wave of electron wavicles surrounding the nucleus D. Rapidly moving nucleus

35mL of acid with an unknown concentration is titrated to completion using 63mL of 3.0 MNaOH. What is the concentration of the acid?