Which of these substances are elements?

quartz

water

iodine

lead

silicon

silicone

15. During inspiration, A. alveolar pressure exceeds atmospheric pressure. B. transpulmonary pressure increases. C. the diaphragm relaxes. D. intrapulmonary pressure is less than atmospheric pressure

Which of the following compounds contains the most deactivated aromatic ring.?

Which is unique to the tire of the car A. Alignment marks B. Tread mark C. Trench marks D. Skid marks

A break in the steel hull of the titanic caused it to leak water and sink. steel it is a combination of iron with many other substance that are evenly mixed together. steel is an example of which type of mixture?

Which are characteristics of all bacteria

How is an unsaturated fat converted to into a saturated fat?

Is hydrofluoric acid stronger than acetic acid?

How much energy does an electric hair dryer use if it draws 8.3 amps of current when using 120 volts for 5.0 minutes?

You need a 45% alcohol solution. on hand, you have a 480 ml of a 40% alcohol mixture. you also have 85% alcohol mixture. how much of the 85% mixture will you need to add to obtain the desired solution?

Write the net ionic reation for the neutralization of hcl by naoh. calculate hrxn for reaction from the enthepies of formation of the reactiom and product