It is easier to push a sofa across a rough surface like carpet than a smooth surface like a hardwood floor.

True

False

An unknown element, x, reacts with rubidium to form the compound rb2x. in other compounds this element also can accommodate up to 12 electrons rather than the usual octet. what element could x be?

Two scientists work together on an experiment, but they have different hypotheses. When the scientists look at the experimental results, they interpret the data in different ways and come to different conclusions.

What is the density of a 15cm3 iron bar that has a mass of 120g?

What property of carbon makes it able to form large macromolecules? Carbon can form five or more bonds with other carbon atoms in chains and rings. Carbon can form single, double, and triple bonds with other carbon atoms.

What type of reaction is BaI^2+H^2SO^4 2H+BaSO^4

Which of the following is true about a redox reaction? In a redox reaction, an electron is lost by the reducing agent. In a redox reaction an electron is lost by the oxidizing agent.

Is the equation above balanced? How do you know? Mg + 2HCl → MgCl2 + H2

What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common?

Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent? A. Decreasing pressure B. Decreasing surface area C. Increasing rate of stirring D. Increasing temperature

Helium, neon, and argon are examples of A) metals B) metalloids C) noble gases D) transitional metals