Are these exo/endothermic

1) combustion of gas in a car

2) water condensing on a mirror

3) boiling water

The scientist found that 2 grams of hydrogen reacted completely with16 grams of oxygen what was the total mass of the water produced

Compare the reactivity of alcohols with the length of the R-group.

What is the formula for iconic compound maganese (ll) chloride

In a sample of which element would you expect to find a sea of electrons surrounding nuclei? N He Na Ag

Suppose that 0.95 g of water condenses on a 75.0 g block of iron that is initially at 22 °c. if the heat released during condensation is used only to warm the iron block, what is the final temperature (in °c) of the iron block?

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?

An object is dropped onto the moon (g m = 5 ft/s 2). how long does it take to fall from an elevation of 250 ft.?

Which type of luster gives the mineral the appearance of metal?

Anything that contains only one kind of material?