Lanthanides and actinides

A. Group 1 elements

B. elements that make up the f block

C. elements of the s and p blocks

D. Group 17 elements

E. entire set of d-block elements

Consider the chemical reaction represented below. CH4 + 2O2 CO2 + 2H2O + Heat Which of the following statements about this reaction is true? A. The reaction releases heat. B. Heat is absorbed by the reaction. C. The reaction releases oxygen. D.

How many atoms of hydrogen in the product of the equation below: 4NH3 + 6NO - -> 5N2 + 6H2O

Which of the following correctly explains how air exerts pressure on us? The molecules in the air located above us are pulled down towards the Earth by gravity, causing a downward pressure on objects below.

In testing the effectiveness of an antacid compound, 20.0g of Hydrochloric Acid is mixed with 28.0g of Magnesium Hydroxide. will the base neutralize all of the acid? How much of which substance is in excess? 2HCL + Mg (OH) 2 - -> MgCl2 + 2H2O

A stock solution is prepared by dissolving 12.5 g of NaCI in enough water to prepare 150.0 mL of solution. What volume of this stock solution will be used to prepare a diluted solution that is 250.0 mL of a 0.500 M solution of NaCI?

Question: Ron is a healthcare worker who needs to lift a heavy patient. Which kind of safety issue does this scenario relate to? A infection B. ergonomics C. human resources D. orientation

Which of the following is the best example of chemical weathering? (A) limestone rocks dissolving in water (B) plant roots growing through concrete and splitting it (C) waves carrying sand away from a beach (D) a large rock splitting into pieces

Is heat of fusion an extensive or intensive property? Why?

How many moles of oxygen gas are produced from the decomposition of six moles of potassium

Why do magnesium and oxygen combine?