I'm a chemical formula such as H2O what does a small number next to an element symbol tell you

You have an aqueous solution with a ph of 8.0. You add sodium chloride to a concentration of 1 gram per 100 milliliters. What happens to the ph?

A 2100 kg car is speeding up at 10 m/s2 down a 500m on-ramp to the highway. What is the force exerted on the car?

N2 (g) + 3H2-> 2NH3 (g) How many grams of ammonia (NH3) can be produced from the reaction of 28.0 g of N2 and 25.0 g of H2?

The Boy In The Striped Pajama Why does grandmother claim that father had come to harm during WW1?

Rewrite each percent as a fraction and decimal 56%

A 126-gram sample of titanium metal is heated from 20.0°C to 45.4°C while absorbing 1.68 kJ of heat. What is the specific heat of titanium?

What pressure (in atm) will a sample of o2 gas occupy at 100.0 ml, if o2 has a volume of 25.00 ml at 2.0 atm?

What happens when francium and nitrogen are mixed

Which type of chemical reaction occurs in 2KClO3 Right arrow. 2KCl + 3O2

An electrochemical cell is constructed using two half-cells: Al (s) in Al (NO2) 3 (aq) and Cu (s) in Cu (NO3) 2 (aq). The two half cells are connected by a KNO3 salt bridge and two copper wires from the electrodes to a voltmeter.