When an apple is cut, it often turns brown. What does the color change indicate? Select one: a. physical and chemical changes b. chemical change only c. physical change only

Which statements are scientific statements? Select all the correct answers. People who drive red cars are more prone to accidents. Children from families that have pets are more likely to develop allergic reactions.

Which statement describes the periodic table

The best place to build a wind farm is in an area that has high winds for a portion of the year. True False

Which of the following describes resistance? completely stops electron flow impedes the flow of electrons is an insulator has to do with the voltage in the circuit

Which is true of genes A - they are proteins that produce sections of DNA which control the cells activities.

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g). Δ[H2S]/Δt = - 0.033M/s. Find Δ[O2]/Δt. Δ[H2O]/Δt. Δ[S8]/Δt. Find the rate of the reaction.

At room temperature and pressure what is the volume of one mole of oxygen?

Ibuprofen, a common pain remedy, has an empirical formula of C7H9O and a molar mass of approximately 218.078 grams per mole. What is the molecular formula of ibuprofen?

Copper (cu) is a transition element used in the making of coins. calculate the mass in grams of 0.0420

In 1864, the Solvay process was developed to make soda ash. One step in the process is represented by the balanced equation below.