a single atom of an element had 21 neutrons, and 20 electrons, and 20 protons which element is it? K. Zr. Ca. Sc

What is the molar heat of combustion for ethanol?

What is the resultant molarity of 20mL of a 3.5M solution is diluted to 100mL? Will mark brainliest

How many atoms are in 8.28 moles of aluminum?

The students teacher explained that vinegar, which is an acid (liquid), and the baking soda, which is a base (solid), reacted and made carbón dioxide water, and a salt, sodium acetate.

Which equation defines the ideal gas law?

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.

How many sulfide ions are present in 23.5g of Sb2S3

2. An automobile tire has a pressure of 210 kPa at 293 K. What will be the tire pressure after driving, if the tire temperature rises to 308 K?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g