How many potassium atoms are present in 0.01456 g of potassium?

11. What measurement best describes the results of a scientific experiment regarding distance? A. 57 miles B. 523 inches C. 500 kilograms D. 51 kilometers

Photosynthesis transfers electrons from water to carbon dioxide molecules. Why is this electron transfer called an oxidation reduction process?

Is lithium iodine an element, compound, or a homogeneous mixture, or a heterogeneous mixture?

The weight of water vapor in a pound of air is measured in

The solid-state transition of Sn (gray) to Sn (white) is in equilibrium at 18.0 ˚C and 1.00 atm, with an entropy change of 8.8 J K-1 mol-1. The density of gray tin is 5.75 g cm-3; that of white tin is 7.28 g cm-3.

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?

A radioactive isotope has the same number of protons as its stable parent atom, but differs in its number of what?