Look at the periodic table and the characteristics of the elements given above. Select the group of elements that include only those that are either colorless, odorless gases or shiny, silvery, soft metals.

How many moles of oxygen are produced by decomposing 40.5 g of h2o2 (molar mass = 34.0 g/mol) according to the equation:h2o2 - - > h2o + o2 (unbalanced) ?

Which of the following statements provides the BEST explanation for the many chemical similarities between two elements in a Main Group? (Note: only ONE answer here.!) (a) They have similar atomic mass values.

Explain how the following changes would affect the rate of the reaction of 2-bromo-3-methylbutane with methanol: Part A The alkyl halide is changed to 2-chloro-3-methylbutane. The alkyl halide is changed to 2-chloro-3-methylbutane.

Imagine yourself taking a position at a racecourse, ready to run as soon as you hear the gunshot. Which energy conversion occurs when you start running?

1. Earth's diameter is 12.756 kilometers. How many meters is this? 2. The diameter of Earth's moon is 3.476 kilometers. Express this distance in centimeters.

Which of the following contains both ionic and covalent bonding? CH4 NaCl NH4Cl N2O4 If the formula for a compound is represented by X2Y3 and the charge on the Y ion is - 2, what is the charge in the X ion? +1 +2 +3 +4

Qual e o maior orgao do corpo humano

Whic of the following fromulas represents a nonpolar molecule? a) N2 b) H2O c) NaCI d) HCI

What is the density of 19.2 g of oak that has a volume of 25.7 cm3?

Which of these is a compound? О co2, O2, Co