A 50.23 gram block of copper (specific heat = 0.39 J/g oC) at a starting temperature of 110.33oC is placed in a calorimeter that contains 100.13 grams of water. After several
minutes had passed, the water temperature rose to 750C. How much did the water
temperature increase?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Match the mixture with the substance// i really need on this guys (it’s a pic btw)