Which of the following best describes a mole as used in chemistry?

A a simplification of mathmatics

B a salt dissolved in water

C a very large number of objects

D a measure of concentration

Which of the following combinations of reactants will result in a synthesis reaction? Cl2 + BaF2 Mg + HClO3 Li + H2O SO2 + H2O

Which of the following is an oxidation-reduction reaction? • SO2 (g) + H2O (1) H2SO3 (aq) • CaCO3 (s), Cao (s) + CO2 (g) Ca (OH) 2 (s) + H2CO3 (1) CaCO3 (aq) + 2H2O (1) • CsH1206 (s) + 602 (9) _, 6C02 (g) + 6H20 (7

What mineral has 2 sugar-cube sized, irregularly shaped pieces. Brassy-yellow in color with metallic luster. Flat surfaces look like little squares. Feels quite heavy. Has a blackish streak.

In this redox reaction identify the reducing agent 2MgO-> 2Mg+O2

Part A Determine the number of protons in each of the following isotopes of chr Enter your answers numerically separated by commas. DVI Aed 2 ? Cr - 50, Cr - 52, Cr - 53 Cr - 54 = Submit Request Answer

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Which of the following is the most likeley example of an favorable mutation A. A mutation that makes a rabbit able run faster B. A mutation that changes the rabbit's fur to bright orange C. A mutation that changes the color of the rabbit's eyes D.

Which of these mole ratios is possible for this reaction? FeCl3 + 3NaOH → Fe (OH) 3 + 3NaCl 1:1 1:3 3:1 2:3

The chemical equation for reduction of phosphorite Ca3 (PO4) 2

Synthesize What environmental effects are shared by all fossil fuels?