Science Detectives
This is a testable explanation based on observations.
What is a scientific hypothesis?
This particle has a negative charge.
What is an electron?
Metals have this property: easily shaped and conduct heat.
What is malleability and conductivity?
This type of reaction absorbs heat.
What is an endothermic reaction?
In saltwater, this is the solute.
What is salt?
This lab tool is best for accurately measuring 27.5 mL.
What is a graduated cylinder?
The atomic number equals the number of these particles.
What are protons?
An ionic bond is this type of attraction.
What is attraction between oppositely charged ions?
This must be equal on both sides of a balanced equation.
What is the number of atoms of each element?
Increasing temperature generally does this to solid solubility.
What is increases solubility?
Repeated trials giving similar results describe this.
What is precision?
Isotopes differ in the number of these particles.
What are neutrons?
A covalent bond involves atoms doing this.
What is sharing electrons?
This is added to increase reaction rate without being used up.
What is a catalyst?
An acid produces these ions in water.
What are H⁺ ions?
The law stating mass of reactants equals products.
What is the Law of Conservation of Mass?
Elements in the same group share this property.
What are valence electrons?
This type of bond occurs when different nonmetals share electrons unequally.
What is a polar covalent bond?
Gas bubbles forming during a reaction are evidence of this.
What is a chemical reaction?
Acid + base reaction producing salt and water.
What is neutralization?
A homogeneous mixture is better known by this name.
What is a solution?
These elements are most likely to form a −1 ion.
What are halogens (Group 17 elements)?
Rusting iron is an example of this type of change.
What is a chemical change?
Two aqueous solutions forming a solid describes this reaction.
What is a precipitation reaction?
Organic chemistry studies compounds containing these two elements.
What are carbon and hydrogen?