Which example best describes a reflex action?

A

bending down to lift a heavy object

B.

coughing when the throat is irritated

C. going for a walk outside

D.

eating food when hungry

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What is the molarity of a solution that contains 2 moles of KCl in 4 L of solution? a 2.0 M b 0.5 M c 0.25 M d 8.0 M

Which list of elements contains two metalloids? (1) Si, Ge, Po, Pb (3) Si, P, S, Cl (2) As, Bi, Br, Kr (4) Po, Sb, I, Xe

he compound known as butylated hydroxytoluene, abbreviated as BHT, contains carbon, hydrogen, and oxygen. A 3.376 g sample of BHT was combusted in an oxygen rich environment to produce 10.11 g of CO2 (g) and 3.312 g of H2O (g).

You already saw that 1.00 g of Al should yield 3.53 g of copper for the reaction below. 3CuCl2 (aq) + 2Al (s) ⟶ 2AlCl3 (aq) + 3Cu (s) However, impurities and errors can occur easily. Suppose that only 2.86 g of copper is produced.

Choose the answer below that gives the correct chemical symbol and classification (metal, metalloid, or nonmetal) for the element named. Select one: a. The element called niobium is a metal with the chemical symbol Ni. b.

How can we tell when something is polar or non-polar in an Inter-molecular Force?

A reaction is most likely to occur when reactant particles collide with

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach? Select one: A. You cannot change the pH of a solution. B.

What is more likely to happen if wetlands are drained?

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.