Which best describes an element? a. a pure substance b. a type of mixture c. a pure compound d. an impure substance

How would changing the proportions of substance in an alloy change its properties?

How many milliliters of a 4.0-molar solution of HCl are needed to completely neutralize 60 milliliters of a 3.2-molar solution of NaOH?

A biochemist who is studying the properties of certain sulfur (s) - containing compounds in the body, wonders whether trace amounts of another nonmetallic element might have similar behavior. to which element should she turn her attention?]

What causes an increase in the reaction rate between molecules

What is the density of a crayon

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?