Explain how there can be so many different kinds of suntances in the world

Calculate Rations. A transformer has ten turns of wire on the input side and 50 turns of wire on the output side. if the input voltage is 120 V, what will the output voltage be?

When a piece of copper metal is heated in air, it joins together with oxygen in the air (a chemical reaction). Then if the copper is weighed, it is found to have a greater mass than the original piece of metal.

Which state of matter has a definate volume but a variable shape. solid, liquid, gas, vapor, gas

Whose atomic model could be described as a positive, solid sphere in which electrons are disbursed? A) Rutherford B) Dalton C) Thomson D) Mendeleev.

Find the pH of a 0.00580 M solution of the strong baseKOH.

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) - > 2LiOH (aq) + H2 (g)

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)

Which type of soil holds the least water