Which of these are made up of matter? Check all that apply.

parts of outer space where there is no air or atoms

salt dissolved in water

air in the lower levels of the Earth's atmosphere

leather made from cow hides

metal after if has been molded

You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene. Which of the following statements is (are) true about these two compounds?

Where does the water enter the plant

If 8.0 g of NH4HS (s) is placed in a sealed vessel with a volume of 1.0 L and heated to 200 ∘C the reaction NH4HS (s) ⇌ NH3 (g) + H2S (g) will occur. When the system comes to equilibrium, some NH4HS (s) is still present.

The men's world record for swimming 1500 m in a long course pool is 14 min 34.56 s. At this rate how many seconds would it take to swim 0.700 miles

Hydrazine, N2H4, reacts with oxygen to form nitrogen gas and water. N2H4 (aq) + O2 (g) ⟶N2 (g) + 2H2O (l) If 3.15 g of N2H4 reacts with excess oxygen and produces 0.950 L of N2, at 295 K and 1.00 atm, what is the percent yield of the reaction?

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms