Element X, i n Perio d 3, ha s th e followin g properties. ● It s oxid e ha s a gian t structure. ● I t form s covalen t bond s wit h chlorine. ● Its oxide will neutralise H C l (aq). What is element X?

Why do your ears "pop" in an airplane?

A home integrated network can be referred to as a?

Give the mass percent of carbon in C14H19NO2?

Which chemical equation is correctly balanced? (1) H2 (g) + O2 (g) = > H2O (g) (2) N2 (g) + H2 (g) = >NH3 (g) (3) 2NaCl (s) = >Na (s) + Cl2 (g) (4) 2KCl (s) = > 2K (s) + Cl2 (g)

How long does it take (in minutes) for light to reach Mercury from the Sun, a distance of 6.26 * 107 km?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?