Elements, Compounds, Mixtures
The simplest form of matter, made of only one type of atom
What is an Element
What is the Proton
The variable that gets changed or tested
What is the Atomic Number of Helium?
What is 2
When paper burns, it creates ash. What type of change is this?
What is chemical change
When two or more DIFFERENT types of atoms combine
The center of the atom is called the;
What is the Nucleus
The aspect of the experiment that you keep the same
What is the constants
What does the atomic number tell you?
The number of Protons & Electrons
In a chemical reaction, what are the starting "ingredients" called?
What are Reactants
Give an example of something that is considered a molecule but NOT a compound
The ring that the electrons orbit around
What is the Electron Cloud
This variable gets placed on the Y-axis of a graph
What is the dependent variable
What is the name of the decimal number located at the bottom of the element squares?
What is Atomic Mass
The new substances formed at the end of a chemical reaction are called
What are products
True or false? Compounds are always molecules but molecules are not always compounds
True
These two subatomic particles make up the nucleus of an atom
What are Neutrons and Protons
Identify the independent and dependent variable in the following experiment;
Izzy is curious to know if her sleep will be affected by painting the walls in her room bright pink.
Independent variable: color of walls
Dependent variable: Amount of sleep
What does atomic mass tell you?
The mass of the protons + neutrons
A student mixes a strong base, NaOH with a strong Acid, HCl. In the end, the student is left with Water (HOH) and Salt NaCl. Even though the same elements are present before and after, why is this a chemical change?
It is chemical because the properties of the reactants are different than the products. For example, HCl is a strong, dangerous acid, while NaCl is an edible food.
How can the atoms in a molecule, like Cl2, reform into a new compound like HCl?
Bonds need to break, atoms rearrange, and new bonds form.
How many electrons can fit on the first energy shell?
What is 2
A student is going to test how the pH of different drinks affects the enamel on teeth. What would the control group be and why?
Water- pH of 7 which is neutral, therefore the "normal".
Boron has 6 Neutrons and an atomic mass of 10.81. How many electrons does it have? SHOW YOUR WORK.
What is 5
A student is making elephants toothpaste with hydrogen peroxide (H2O2), yeast, warm water, and food dye. After adding the ingredients together, there is an explosion and he notices bubbles have formed. What was produced that formed the bubbles?