In order for us to hear a sound, sound waves must first

A boy kicks a ball with a force of 40 N. At exactly the same moment, a gust of wind blows in the opposite direction of the kick with a force of 40 N. What happened to the ball? A. It began to move with a speed of 80 m/s. B. It did not move. C.

Explain why gas is condensed when they're cooled

Classify each example as an element a compound a heterogeneous mixture or a homogeneous mixture a pure drinking water

A gaseous mixture made from 37.14 g N2, 34.4 g C2H2, and 38.25 g of CO is placed in a 33.53 L vessel at 27.3 °C. What is the total pressure in the vessel?

Lets say you were doing an experiment on two different chemicals in two different test tubes. One chemical is giving off oxygen gas or hydrogen gas the other is giving off carbon dioxide gas.

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.