25%of a first order reaction is completed in 30 mint. Find the time required for completion of 50% of reaction

Imagine you have two containers of gas, one labeled gas A and one labeled gas B. Gas A has an average speed of 700 m/s and gas B has an average speed of 1100 m/s. Both containers are being held at the same temperature.

Which statement best describes a physical change

the pressure of 5.0 L of gas increases from 1.50atm to 1240 mmgh. what is the final volume of the gas, assuming no change in moles or temperature?

Why are there 24 hours in 1 day?

Name everyday objects where insulation is used to keep objects warm or cool. If you answer this question you are a angle confirmed.

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab

Which statement best describes Rutherford's model of the atom?

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting