Scientific Method
What is the first step of the scientific method?
What are the three parts of an atom?
proton, neutron, and electron
Where do acids fall on the pH scale?
Between 1-6
What two things are formed when an acid and base react?
Water and Salt
What does the coefficient represent/mean in a chemical equation
2NaCl
The number of each substance needed
What is an independent variable?
How can you determine the number of electrons in a given element?
Look at the atomic number
Where do the bases fall on the pH scale?
8-14
What type of reaction happens when an acid reacts with a base?
Neutralization
Provide an example of a physical change AND an example of a chemical change
Physical: boiling, melting, cutting, crushing
Chemical: burning, rusting, decomposing
What is a hypothesis?
An educated guess or assumption of what will happen
How can you identify an ionic bond?
Formed between a metal and non metal, electrons are taken or given
Where does water fall on the pH scale?
7, Neutral
This type of reaction involves two or more substances combined to form one product
Synthesis
Balance this chemical equation:
Fe + Cl ------> FeCl3
2Fe + 3Cl ------> 2FeCl3
What is the purpose of a control group?
To compare all other results to.
How can you identify a covalent bond?
Between two non metals, shared electrons
What does pH stand for?
Potential of Hydrogen
This type of reaction involves a single reactant breaking down into two or more products
Balance this equation:
NaOH + CaBr2 ---> Ca(OH)2 + NaBr
2NaOH + CaBr2 -----> Ca(OH)2 + 2NaBr
Sam wants to see if the amount of light effects the growth of her plants. What are some things that must be kept constant to ensure accuracy of the experiment?
soil type, pot size, amount of water, type of plant
Find the number of:
Protons, Neutrons, and Electrons for the element
Oxygen
Protons (atomic #): 8
Neutrons (atomic mass-atomic #): 8
Electrons (atomic #): 8
This acid, typically found in citrus, has a pH typically around 3. What is it?
Citric Acid
This law states that, mass is neither created nor destroyed in a chemical reaction
Law of Conservation of Mass
Provide at least two signs that a chemical change has occured.
release of light, temperature change, odor change, color change, gas given off, sudden appearance of a solid.