Who Organized elements into four groups based on properties:

A hot copper pipe is placed in a water-filled calorimeter and the calorimeter is sealed. Which pieces of data must you know in order to calculate the thermal energy released as the pipe cools?

What do we call the type of chemical reaction that occurs in this step? Explain how the name of this type of reaction relates to a key resource other than food.

How to use the number of valence electrons to predict the ionic charge of main group elements?

Is an element that is soft and easy to cut cleanly with a knife likely to be a metal or a nonmetal?

15.5 g of an unknown metal at 165.0°C is dropped into 150.0mL of H2O at 23.0°C in a coffee cup calorimeter. The metal and H2O reached thermal equilibrium at 30.0°C. Calculate the specific heat capacity of the unknown metal.

A discharging lead-acid battery is best described as 1.) chemical cells that use an electrical current 2.) chemical cells that produce an electrical current 3.) electrolytic cells that use an electric current 4.

Which direction does 3A + 2B = C + 2D + Heat

Which of the following shows a correct relationship between first ionization energies of the given atoms? View Available Hint (s) Which of the following shows a correct relationship between first ionization energies of the given atoms?

How many moles of AlCl3 are in 2.25L of a 0.15 molar solution? A. 0.07 moles B. 0.15 moles C. 0.34 moles D. 15

Which kind of element forms covalent bonds give two reasons for this