If heat is released from water, what phase change occurs?

What is the molecular formula of a compound with the empirical formula CH and a molar mass of 39.01 grams per mole?

A gas evolved during the fermentation of sugar was collected at 22.5°C and 702 mmHg. After purification its volume was found to be 25.0 L. How many moles of gas were collected? A) 0.95 mol B) 1.05 mol C) 12.5 mol D) 22.4 mol E) 724 mol

Solid block of exactly 100.0cm3 has a mass of 153.6 g. Determine it's density.

How many moles of copper are present in a sample of tennanite with a mass of 2450 grams

If element X has 65 protons, how many electrons does it have

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?