Matter & Atoms
The basic building blocks of matter.
Answer: What are atoms?
A change that does NOT change the identity of a substance.
Answer: What is a physical change?
The substances present at the beginning of a chemical reaction.
Answer: What are reactants?
A uniform mixture of substances.
Answer: What is a solution?
Compounds containing carbon bonded to other elements are called these.
Answer: What are organic compounds?
These negatively charged particles move around an atom's nucleus.
Answer: What are electrons?
A change that transforms the identity of matter.
Answer: What is a chemical change?
The substances formed at the end of a chemical reaction.
Answer: What are products?
The substance that gets dissolved in a solution.
Answer: What is a solute?
These organic compounds include sugars and starches.
Answer: What are carbohydrates?
An atom with an unequal number of protons and electrons is called this.
Answer: What is an ion?
A reaction that releases energy, often as heat or light.
Answer: What is an exothermic reaction?
This is the energy needed to get a chemical reaction started.
Answer: What is activation energy?
The random spreading of particles from one area to another.
Answer: What is diffusion?
These molecules include fats and oils and are important for storing energy.
Answer: What are lipids?
This type of bond forms when atoms share electrons.
Answer: What is a covalent bond?
A reaction that absorbs energy is called this.
Answer: What is an endothermic reaction?
This substance speeds up a reaction by lowering its activation energy.
Answer: What is a catalyst?
The attraction between water molecules is called this.
What is cohesion?
Proteins are polymers made from these smaller molecules.
Answer: What are amino acids?
This type of compound forms through the attraction of positively and negatively charged ions.
Answer: What is an ionic compound?
During photosynthesis, plants absorb energy from this source to produce glucose.
Answer: What is sunlight/the Sun?
These biological catalysts make important chemical reactions happen faster in living things.
Answer: What are enzymes?
Water's unequal distribution of charge makes it this type of molecule.
Answer: What is a polar molecule?
These three-part building blocks contain a sugar, phosphate group, and nitrogen-containing base.
Answer: What are nucleotides?