Scientific Thinking
A scientific law summarizes what happens under certain conditions, but it does not usually explain this.
What is why it happens?
The SI unit most commonly used for measuring mass in the lab.
What is the gram?
Tearing paper is this type of change.
What is a physical change?
In a chemical equation, the substances present before the reaction starts.
What are reactants?
The formula for speed.
What is speed = distance / time?
A testable explanation based on observations and background knowledge.
What is a hypothesis?
The number 0.00450 has this many significant figures.
What is three?
Burning wood is this type of change.
What is a chemical change?
n H₂O, the small 2 is called this.
What is a subscript?
A change in velocity over time.
What is acceleration?
In an experiment testing how sunlight affects plant growth, the amount of sunlight is this variable.
What is the independent variable?
he number 6,420,000 written correctly in scientific notation.
What is 6.42 × 10⁶?
Flammability and reactivity are examples of this type of property.
What are chemical properties?
Chemical equations must be balanced because of this law.
What is the law of conservation of mass?
The formula for Newton's Second Law.
What is F = ma?
The group used for comparison that does not receive the factor being tested.
What is the control group?
A 96.0 g metal sample has a volume of 12.0 cm³. Its density is this.
What is 8.00 g/cm³?
Density, melting point, boiling point, and solubility are examples of this type of property.
What are physical properties?
The reaction A + B → AB is this type of reaction.
What is synthesis?
A 5.0 kg object accelerates at 4.0 m/s². The net force is this.
What is 20 N?
A hypothesis must be this, meaning it can be proven wrong by evidence.
What is falsifiable?
This is why a number is not very useful in science unless it includes a unit.
What is because the unit tells what was measured?
A reaction that absorbs heat from its surroundings is called this.
What is endothermic?
The balanced form of Mg + O₂ → MgO.
What is 2Mg + O₂ → 2MgO?
A 7.5 kg object accelerates at 2.0 m/s². The net force is this.
What is 15 N?