Question

which of these is an compound?
tea
copper, cu
shampoo
sodium hydroxide, naoh
18 multiple choice 1 point
a student notices that increasing the temperature causes an increase in pressure. which of the following conclusions explains this observation?
increasing temperature causes particles to get larger resulting in a greater number of collisions.
increasing temperature increases the number of gas particles in the sample and results in a greater number of collisions.
increasing temperature results in the size of the container increasing and fewer collisions among the particles.
increasing temperature results in faster moving particles and more frequent and forceful collisions.

Explanation:

1. A compound is a substance made up of two or more different elements chemically combined. Tea and shampoo are mixtures. Copper is an element. Sodium hydroxide (NaOH) is composed of sodium (Na), oxygen (O), and hydrogen (H) elements chemically bonded, so it is a compound.
2. According to the kinetic - molecular theory, when the temperature of a gas is increased, the average kinetic energy of the gas particles increases. This causes the particles to move faster, resulting in more frequent and forceful collisions with the walls of the container, which leads to an increase in pressure.

Answer:

1. D. sodium hydroxide, NaOH
2. D. Increasing temperature results in faster moving particles and more frequent and forceful collisions.