Why is zinc chloride a substance and not a mixture

Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used.

A 14.0 kg cart is coasting down a street at a steady speed of 7.00 m/s. what is the kinetic energy of the cart?

Wood, plastic, rubber and air are good insulators because A. they conduct charge. B. charge flows easily. C. they don't have free electrons. D. they have low resistance.

Which describes acceleration involving only a change in direction? A. moving at constant speed around a circular track B. moving at increasing speed around a curve C. an object in free fall D. an object at rest

How is penicillin used? a to make bread rise b to kill protists that cause disease c to make cheese d to kill bacteria that cause disease

An advertisement uses a movie star holding a bottle of perfume. This ad is an example of which of the following? A. an appeal of association. B. an appeal to reason. C. an appeal to economics. D. an appeal to patriotism.

An example of an unbalanced force is

When the atom's electrons step down to lower energy levels in a thin cloud of hot gas, what is produced?

Which is the relationship between algae and fungus? Options: Parasitism. Commensalism. Mutualism.

Photosynthesis is an endothermic chemical reaction that forms sugars from carbon dioxide, water, and the sun's energy. Which of the following must be true of photosynthesis?