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Identify the following as an element, compound, homogeneous mixture, or heterogeneous mixture: A magnet composed of Alnico alloy (Al, Ni, Co, Fe, & Cu)

Identify the following as a metal, nonmetal or semimetal/metalloid:  carbon (C)

What specific class of matter is a 3% hydrogen peroxide solution?

Identify the following as an element, compound, homogeneous mixture, or heterogeneous mixture: sand (SiO2) and sugar (C6H12O6)

What is the term for an investigation that entails performing an experiment, proposing a hypothesis, testing the hypothesis, and ultimately stating a theory or law?

Based on the molecular diagram below, classify the type of change that is occurring.

Two samples of matter have been collected and observed. The following properties were collected. (2 points) Sample A: 10.0 g grey solid, malleable, reacts with nonmetals, Density=2.3 g/mLSample B: 25.0 g grey solid, malleable, reacts with nonmetals , Density= 2.3 g/mL (a)  Are the properties recorded, physical properties, chemical properties or both? _________________(b)  Are these two samples, the same type of matter or different?_______________________________

Identify the following as a physical property, a chemical property, a physical change, or chemical change: Phosphine is explosive (will explode) when combined with oxygen.

Provide a hypothesis for ONE of the following observations: (4 points)(a)  You sneeze every time you visit your friend’s house. OR (b)  On a cold morning, the air pressure in the tires of your automobile measures 34 pounds per square inch. After several hours of high-speed driving the pressure measures 38 pounds per square inch.

A sample of matter changes directly from a solid to a gas without going through the liquid phase. What is the name of this phase change?