Mendeleev organized the elements:

1) alphabetically by name

2) by numbers of electrons

3) by increasing atomic weight and similar properties

4) by increasing atomic number and similar properties

a radioactive substance has a half-life of 10 years. if you start with 30 grams of the substance, how much will remain after 30 years.

A buffer is prepared by adding 139 mL of 0.39 M NH3 to 169 mL of 0.19 M NH4NO3. What is the pH of the final solution? (Assume the value of Kw is 1.0 ✕ 10-14. Enter an unrounded value.)

Explain, using the particle theory, how the rate of a chemical reaction depends on concentration and temperature (6marks)

To calculate the heat absorbed by an object, what information is needed besides its specific heat?

Which gases each make up less than 1 percent of Earth's atmosphere? Select three options. argon oxygen nitrogen water vapor carbon dioxide

What property do most metals share

Express this amount in dozens. (Use decimal form.) 75 pies

A series circuit has two 5.0-ohm resistors and a power source of 9.0 volts. How will the current be affected and what will it be if another resistor (with a resistance of 7.5 ohms) is added to the circuit? A. increase; 0.51 amps B. increase; 0.

Which type of reaction will occur when equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed 1. Neutralization 2. Ionization 3. Electrolysis 4. Hydrolysis

What is molarity of heavy water?