How many electrons would the element calcium need to be electrically neutral?

Where the use of energy is concerned (in scientific sense), when is work done?

5. Which of the following characteristics in a chemical reaction indicates that a precipitate has formed? a. The product changes c. The product becomes a color only liquid b. A gas is produced d. A solid is produced

A container of gas is initially at 0.750 atm and 45 C. What will the pressure be at 105 C? A) 0.496 atm B) 55.9 mmHg C) 39.5 mmHg D) 359 atm

If a drop of red ink is placed in one end of a shallow pan filled with water, and a drop of blue ink is placed in the other end, how will the ink be distributed at true at equilibrium?

Which of the following is equal to 5.3 mm3? 5.3 x 10-6 m3 5.3 x 10-9 m3 5.3 x 10-6 cm3 5.3 x 103 cm3

Which scientist performed the cathode ray experiment leading to the discovery of electrons

Why does the temperature remain constant during melting till all the ice has melted?

In a certain organic compound, one of the carbon atoms is bonded to four atoms. One of these is a carbon atom, and the other three are hydrogen atoms. What type of bond exists between the two carbon atoms? A. Ionic B. Dispersion force C.

How much hbro must be added to 1l of pure water to make a solution with a ph of 4.25? ka = 2.00 * 10-9?

Water is known as the 'universal solvent' because: Water is capable of dissolving every substance. Water can dissolve many ionic and covalent compounds. Water can dissolve many substances, but often requires large amounts of heat to be added.