density and matter
What is the formula for density
D=m/v
Explain the difference between a physical property and a chemical property.
A physical property can be observed or measured without changing what a substance is. A chemical property describes how a substance can change into a different substance.
What are some common properties of metals?
Metals are often shiny, malleable, and ductile, and they usually conduct heat and electricity well.
What Si unit is used to measure weight?
The SI unit of weight is the newton (N).
What is the difference between a scientific law and a societal law?
A scientific law describes a consistent pattern observed in nature. A societal law is a rule established by a government or community.
What units are commonly used for density
Common units include grams per cubic centimeter (g/cm³) and grams per milliliter (g/mL).
Why does a metal spoon become hot faster than a wooden spoon in hot soup?
Metal transfers heat more quickly than wood, so the metal spoon warms faster in hot soup.
Why are nonmetals usually poor conductors of electricity?
Nonmetals usually lack freely moving charged particles, which makes it difficult for electric current to flow through them.
What tool is commonly used to measure mass?
A balance, such as a triple-beam balance, is commonly used to measure mass.
Can scientific laws change? Explain.
Scientific laws may be refined or replaced if strong new evidence changes scientists’ understanding of a natural pattern.
If two objects have the same volume, which object will have the greater mass?
The object with the greater density will have the greater mass if both objects have the same volume.
Define thermal conductivity.
Thermal conductivity is how well a material transfers heat.
What variable should scientists control during an experiment?
Scientists should control variables that could affect the results, changing only the variable they are testing.
Explain the difference between mass and weight.
Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.
Why do scientists revise ideas based on new evidence?
Scientists revise ideas when new evidence shows that an earlier explanation may be incomplete or incorrect.
Explain why oil floats on water.
Oil floats on water because it is less dense than water.
What happens to the solubility of many substances as temperature increases?
The solubility of many solid substances in liquids increases as temperature rises, though this is not true for every substance.
Why is repeating an experiment important in science?
Repeating an experiment helps show whether the results are consistent and reduces the influence of chance or errors.
How is weight affected by gravity?
Weight changes with the strength of gravity: stronger gravity produces greater weight, and weaker gravity produces less weight.
Why do scientists revise ideas based on new evidence?
Scientists revise ideas when new evidence shows that an earlier explanation may be incomplete or incorrect.
What happens to carbon dioxide gas in an open soda over time?
Carbon dioxide escapes from the open soda into the air, so the soda gradually loses its fizz.
How can graphs help compare solubility data?
Graphs organize solubility data visually, making it easier to compare substances and see how solubility changes with temperature.
Why is a graduated cylinder more accurate than a beaker for measuring liquid volume?
A graduated cylinder has finer measurement markings and a narrower shape than a beaker, making liquid volume readings more precise.
Which liquid would sink below water: a liquid with a density of 0.50 g/mL or 1.50 g/mL?
The liquid with a density of 1.50 g/mL would sink. Its density is greater than water’s density of about 1.00 g/mL, while 0.50 g/mL is less dense and would float.
Explain how accurate measurements improve scientific results.
Accurate measurements reduce error, helping scientists make more dependable comparisons and conclusions.