A sample of a gaseous substance changes into a liquid

Which of the following occurs in every chemical reaction? A) Water is given off B) The total mass of the reactants increases C) The total mass of reactants equals the total mass of the product D) The total mass of the products is grater than the

When a substance goes directly from a gaseous state to a solid state as dry ice does

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of which function (s) ?

A dam produces 400 watts of electrical energy. What is the efficiency of the dam?

The most chemically reactive metals are in Group 1 of the periodic table. true or false

An alloy is made of a material of specific gravity 7.87 and another material of specific gravity 4.50. The alloy of mass 750g has an apparent weight of 6.6N when totally immersed in a liquid of specific gravity 0.78.

A ball with a mass of 3 kg moving at 5 m/s collides with a 9 kg ball at rest. After the collision, the impacting (3 kg) ball bounces back at a speed of 2.5 m/s. How fast does the 9 kg ball move and in what direction

Consider the four salts represented on the solubility curves displayed as line graphs. In all four cases the salts are which part of an aqueous solution?

A hot-air balloon of diameter 12 m rises vertically at a constant speed of 11 m/s. A passenger accidentally drops his camera from the railing of the basket when it is 19 m above the ground.

Describe the possible long term impact of a catastrophic event