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

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

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?

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

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?

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.

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.

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 metal, nonmetal or semimetal/metalloid:  A shiny, but dark solid with electrical conductivity that can be modified.

PERIODIC TABLE IS PROVIDED FOR REFERENCE TO ANSWER THE FOLLOWING QUESTIONS: