The rare earth elements include A. the actinide series and the alkaline earth metals. B. the alkali metals and the transition metals. C. the lanthanide series and the actinide series. D. the lanthanide series and the alkali metals.

Consider the reaction 2 hbr (g) à h2 (g) + br2 (g) a. express the rate of the reaction in terms of the change in concentration of each of the reactants and products. b. in the first 25.0 s of this reaction, the concentration of hbr drops from 0.

The smllest particle of an element is the

Bond type Ionic, covalent, polar covalent or non polar (1) - 0.86 (2) - 1.61 (3) 0.84 (4) - 2.22 (5) 0.29

Which of the following substances dissolves most readily in gasoline?

2 grams of a substance was dissolved in 75.0 g of water resulting in a temperature decrease from 23.1 ⁰C to 18.7 ⁰C. The specific heat of the solution is 4.18 J/g·⁰C. Calculate the amount of heat associated with the water.

The bonds in the compound MgSO4 can be described as A. ionic, only B. covalent, only C. both ionic and covalent D. neither ionic nor covalent

If The mass of a box is increased and the force stay the same, determine the relationship with acceleration

A balloon contains 0.15 moles of co2 gas. how many molecules of co2 are in the balloon?

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams