Physical properties
What type of property describes a characteristic of a substance that can be observed or measured without changing the substance into a new substance?
Physical property
What type of property describes how a substance can react to form new substances?
chemical property
Ice melts into liquid water. Is this a physical or chemical change?
physical change
What property describes how much matter is packed into a certain amount of space?
Density
Scientists can use physical properties to help identify what type of material?
an unknown substance
Name three physical properties of matter.
color, density, mass, volume, hardness, melting point, boiling point, magnetism, conductivity, solubility.
Is the ability of iron to rust a physical or chemical property?
chemical property
A piece of paper is torn into smaller pieces. What type of change occurred?
physical change
What is the formula for density?
Density = Mass ÷ Volume
Name two physical properties a scientist could measure to help identify an unknown material.
density, melting point, boiling point, hardness, conductivity, magnetism, or solubility.
A student describes a mineral as shiny, silver-colored, and smooth. Are these qualitative or quantitative observations?
Qualitative observations.
what is flammability
describing the ability of a substance to burn
A silver-colored metal develops a new coating after reacting with substances in the environment. What type of change most likely occurred?
chemical change
A rock has a mass of 40 g and a volume of 10 cm³. What is its density?
4 g/cm³
A scientist compares the density and boiling point of two unknown liquids. Why would these measurements be useful?
They can help the scientist identify and distinguish the substances.
A student records that a sample has a mass of 75 grams and a volume of 25 mL. What type of data are these measurements?
quantitative data
A substance reacts strongly when placed in acid is called
reactivity
A student says that dissolving salt in water is always a chemical change because the salt cannot be seen. How could you prove the student is incorrect?
The salt can be recovered by removing the water, showing that no new substance had to form
An unknown substance has a density of 5 g/mL and a volume of 8 mL. What is its mass?
40 g
During an experiment, two substances are mixed. Bubbles form, the temperature changes, and a new color appears. What do these observations suggest
They provide evidence that a chemical reaction may have occurred.
A scientist wants to compare two unknown solids without changing either substance. What kind of properties should the scientist investigate?
physical properties
Explain the difference between a physical property and a chemical property.
A physical property can be observed or measured without changing the substance's identity. A chemical property describes how a substance can react to form new substances.
Explain why melting candle wax and burning candle wax are different types of changes.
Melting is a physical change because the wax changes state. Burning is a chemical change because the wax reacts and forms new substances.
A metal sample has a mass of 72 g and a density of 6 g/cm³. What is its volume?
12 cm³
What is the strongest evidence that a chemical change has occurred?
The formation of a new substance.