What is a mesurement that describes how close the measurement comes to the true value

What mass of NH3 can be made from 1221g of H2 and excess N2

A runner has a mass of 75 kg and a speed of 10 m/s. What is her kinetic energy? (KE = 1/2mv2)

A chemist must dilute 58.00 ml of 13.5 M aqueous silver nitrate) AgNO3) solution until the concentration falls to 5.00 M. He'll do this by adding distilled water to the solution until it reaches a certain final volume.

Why does strawberry ice cream melt?

What happens when substances melt

A solution of ammonia and water contains 1.50*10^25 water molecules and 8.20*10^24 ammonia molecules. How many total hydrogen atoms are in this solution?

Suppose a 500. mL flask is filled with 1.0mol of CO, 1.5mol of H2O and 0.70mol of CO2. The following reaction becomes possible: + COgH2Og + CO2gH2g The equilibrium constant K for this reaction is 3.80 at the temperature of the flask.

Which term best defines a saturated hydrocarbon with single bonds only? a. alkane b. isomer c. alkene d. alkyne

Which of the following is TRUE if a system WILL NOT hold a vacuum after it has been evacuated? A. The system is ready to be charged. B. The system has been adequately evacuated. C. The system may be leaking. D. An expansion valve is clogged.

Balance each equation by writing the correct coefficient (put a space in the box if no coefficient is needed). Then, identify the type of reaction taking place. 1. CaCO3 → CaO+CO2 ___CaCO3 → ___CaO+___CO2 is a decomposition reaction. 2.