Blog

A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32 chromatids are present. The role of fertilization in this species is to (Check all that apply)

A calorimeter containing 769.0 g of water at an initial temperature of 25.00 °C was used to measure the heat involved in a reaction. When the reaction was finished, the temperature of the water increased to 33.90 °C. Is the reaction endothermic or exothermic and how much heat energy involved in the reaction? (swater=4.184 J/goC)  The reaction is [1]. The amount of heat exchanged is [2]. 

Determine the signs of heat and work based on the following scenarios: The reaction is endothermic q=[q] The volume increases w=[w]. 

Determine the signs of heat and work based on the following scenarios: The reaction is exothermic q=[q] The volume increases w=[w]. 

What is the coefficient of carbon dioxide when the following equation is balanced to the lowest whole number ratio? 

Determine if the following reactions are exothermic or endothermic.

Choose the strong acids from the following (there may be more than one). 

A lab has a stock solution of 7.50 M hydrochloric acid. A scientist needs 0.750 L of 0.354 M hydrochloric acid, how many milliliters of the stock solution does the scientist need to use? 

For the following hypothetical reaction how much heat is released in kilojoules (kJ) if 210.0 g of propanol (C3H7OH ) is added to excess oxygen?   

If 21.2 g of chlorine gas reacts with 24.5 g of sodium iodide what is the limiting reagent and how much sodium chloride can be produce?