A solid substance turns into a liquid. Which best describes this change?

3. What effect does dark energy have on the universe?

Select the correct answer. Which statement best explains how electrons form a covalent bond in a molecule? A. A pair of electrons splits so that each atom gets one electron. B. A pair of electrons belongs to two atoms at the same time. C.

Use the drop-down menus to answer the questions. Which type of radioactive decay produces particles with a positive charge and very small mass? Which type of radioactive decay produces radiation with zero mass?

For the reaction, calculate how many moles of the product form when 2.05 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 2H2 (g) + O2 (g) →2H2O (l)

2. A sample of neon gas has a volume of 87.6 L at STP. How many moles are present?

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?

What are facts on osmosis?

If a map of temperature displayed stripes parallel to the equator with equal temperatures at equivalent distances north and south of the equator, it would mean that only blank affected temperature.

What is the term for the amount of salts in water? Evaporation Evaporation Salinity Thermocline Density