SI Units
Which SI base unit is used for temperature?
Kelvin
Convert 2 m to centimeters.
200 cm
A scientist notices that a tablet dissolves faster in hot water than cold water. What step of the scientific method is this?
Observation
The negatively charged particle found outside the nucleus.
Electron
This prefix means 1,000.
Kilo
Which SI unit would be most appropriate for the mass of a car?
Kilogram
Convert 5000 mg to grams.
5 g
A student predicts that increasing water temperature will cause a tablet to dissolve faster. What is this prediction called?
Hypothesis
A substance made of only one type of atom.
Element
This prefix means 1/100.
Centi
Which SI derived unit is used to measure force?
Newton
Convert 3.5 L to milliliters.
3500 mL
A scientist uses 1 g of magnesium in every trial while changing acid concentration. Why must the magnesium mass remain constant?
Control variable
An atom has 17 protons and 18 electrons. What is its overall charge?
−1
Which prefix represents 10⁻⁶?
Micro
Which SI unit would be used to measure the volume of a cube using SI-derived units?
Cubic meter
Convert 0.075 km to meters.
75 m
1) Which variable is normally placed on the x-axis of a graph?
2) Which variable is normally placed on the y-axis of a graph?
1) Independent variable
2) Dependent variable
A substance can be separated into its components using physical methods but has no fixed composition. What is it?
Mixture
(A mixture is a physical blend of two or more substances. The parts do not join with a chemical bond. Each part keeps its own normal traits, and you can mix them in any amount. You can also split them apart using physical steps like filtering or boiling)
Which prefix represents 10⁻⁹?
Nano
Which SI base unit would you use to measure the amount of substance in a sample?
Mole
Convert 2.5 × 10³ μg to milligrams.
2.5 mg
A scientist changes both acid concentration and temperature while measuring reaction rate. What is wrong with the experiment?
Multiple independent variables
Two atoms have the same number of protons but different numbers of neutrons. What are they called?
Isotopes
Arrange these from smallest to largest: milli, nano, kilo, micro.
Nano → Micro → Milli → Kilo