What is meaning of trash

Which best describes an element? a pure substance a type of a mixture a pure compound an impure substance

2H2O + 2Na? 2NaOH + H2 Which of these is a reactant in this chemical reaction?

A 100. mL volume of 0.800 M calcium chloride is mixed with 400. mL of water to make 500. mL of solution. What is the final molarity of this solution?

Two descriptions for a sub-atomic particle are listed below: Description 1: Has a noticeable relative mass Description 2: Located inside the nucleus of an atom Which sub-atomic particle or particles fit these descriptions?

what is the balanced equation for the reaction of solid magnesium metal with oxygen gas to produce solid magnesium oxide

If the mass of a material is 76 grams and the volume of the material is 16 cm3, what would the density of the material be? g/cm3

Calculate the specific heat of a metallic element if 50.0 g of the metal need 314 joules of heat energy to raise the temperature from 25°C to 50°C.

State the relationship between the number of electrons in a carbon-nitrogen bond and carbon-nitrogen bond energy

What are the characteristics of bones?

If 294 grams of FeS2 is allowed ti react with 176 grams of O2 according to the following equation how many grams of Fe2O3 are produced? FeS2 + O2 = Fe2O3 + SO2