If an element has an atomic mass of 127 and an atomic number of 53, how many neutrons does it have? 74 127 53 75

A gaseous sample of pure methane, CH4, is found to occupy a volume of 20.0 L at 25℃ and 1 atm pressure. What volume of O2, at the same temperature and pressure, should be just sufficient to permit complete combustion of the methane? 10.0 L 20.0 L 30.

How many grams of Pb and FeSO4 are required to produce 200 grams of PbSO4?, what mass of Fe is also produced? 1Pb+1FeSO4 - > 1PbSO4+1Fe

Carla did an experiment by placing a piece of smooth, clear glass and a piece of smooth, black stone under a lamp for twenty minutes. which prediction will most likely be supported by carla's experimental results?

bre: 1073/2900 Resources A sample of metal has a mass of 24.02 g, and a volume of 5.02 mL. What is the density of this metal? g/cm privacy policy terms of use contact us hele MacBook Pro

When protons and neutrons join together to make a nucleus, energy is?

What would be the change in pressure in a sealed 10.0 L vessel due to the formation of N2 gas when the ammonium nitrite in 1.00 L of 0.500 M NH4NO2 decomposes at 25.0°C?

Read the given equation. Na2O2 + CO2 → Na2CO3 + O2 What volume of O2 gas is produced from 2.80 liters of CO2 at STP?

Drinking water may contain a low concentration of lead ion (Pb2) due to corrosion of old lead pipes. The EPA has determined that the maximum safe level of lead ion in water is 15 ppb.

A student examines the temperature and precipitation on a given day using a thermometer and a rain gauge. The student is measuring- A. temperature only B. climate only C. wind speed only D. specific weather conditions

Atoms - 1 2 3 4 Protons - 8 10 9 8 Neutrons - 10 9 9 11 Electrons - 8 10 9 8 Which two are isotopes of one another?