A 75.00 g sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.27 g oxygen. calculate the percent composition of this substance.

Sugar dissolves in water physical change or chemical change

What is a solution? a mixture of two or more substances that are mixed evenly throughout a mixture of two or more substances that are chemically combined

A piece of iron (Cp = 0.450 J / (gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J / (gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C.

When the following reaction is completed and written in the form of a net ionic equation, which of the following elements will NOT be present in the equation? Pb (NO3) 2 (aq) + K2SO4 (aq) a. Pb b. S c. O d. N

Calculate the thermometer in an air-conditioned room reads 20.0°C what is the temperature of the room In degrees Fahrenheit and in kelvins? Show your work

Which type of reaction occurs in the following? 2HgO (s) - - 2Hg (l) + O2 (g) 1. a decomposition reaction in which a metal is reduced 2. an acid-base neutralization reaction to produce oxygen gas a displacement 3.

Is pulverizing an aspirin a physical or chemical process

Explain two reasons why we can conclude that the rise of the water in the glass tube is due to root pressure and not transpiration or capillarity

Four type of molecular models

How many particles are in 1 mol of carbon? 1 mol of lithium? 1 mol of eggs? will 1 mol of each of these substances have the same mass?