Which of the following elements has 2 electrons in the 4s sublevel?

Which statement accurately describes nonmetals? (Select all that apply). Most nonmetals are liquids at room temperature. Nonmetals are moldable and easily shaped. Most nonmetals are gases at room temperature. Nonmetals fracture easily under pressure.

How are natural polymers and synthetic polymers similar? A) both are made up of phosphates and organic bases B) both are made up of monomers that are linked by covalent bonds C) both serve an important role in producing amini acids

Which of the following is the most likely sign that a chemical change has happened? A) liquid rests on a table overnight, and some evaporate. B) two liquids are mixed at room temperature and a gas forms.

What is the balanced molecular equation for the neutralization reaction between Hl and Ba (OH) 2 in aqueous solution

What would have been the initial pressure reading of a sample of oxygen gas that started at 25.0 mL in volume and was compressed to 15.0 mL? The final pressure reading was 1.90 atm. (Temperature was kept constant.)

The molality of a solution is a measure of - A - moles of solute per kilogram of solution B - moles of solute per liter of solution C - moles of solute per kilogram of solvent D - moles of solute per liter of solvent

Which technology has allowed for exploration beyond our solar system? A) space probe B) space station C) space shuttle D) space observatory

Which carbonate is most stable to heat? A. Sodium carbonate B. Copper (ii) carbonate C. Zinc carbonate

How many liters of 0.75 M solution can be made using. 336 moles of lead (II) oxide?

Which molecule, when added to a solution, would give the solution the highest ph? A. HCI B. H2SO4 C. KOH D. H2O