What elements are in water? 1. Hydrogen and Helium

2. Hydrogen and Oxygen

3. Helium and Oxygen

4. Hydrogen and Nitrogen

Write a paragraph at least 10 sentences explaining how rocks are used today in society

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)