Small but Mighty
These are located in the nucleus of an atom
Protons and neutrons
Elements are composed of these types of atoms
The same type of atoms
Fluorine has this many protons
9 protons
Folding paper is an example of a __________ change
Physical change
This states that in a chemical reaction, the number of atoms of a reactant must be equal to the number of atoms of the product.
The Law of Conservation of Mass
These particles have a negative charge
Mango juice is an example of
A mixture
These contain elements with similar properties
Groups
Lance is 3-D printing a phone case. He puts the filament in as a solid, the machine melts it, and then shapes it into the phone case.
Is this a chemical or physical change? Explain.
This is a physical change. The filament is changing states of matter into different shapes.
How many atoms of carbon are in the reactant:
2CO
2 atoms
Protons + Neutrons = ___________
Atomic mass
Compounds are composed of
Two or more elements
These have similar properties to sodium (write all that apply):
A. lithium
B. magnesium
C. calcium
D. potassium
E. aluminum
A, D
Ada combines 1 beaker of 100 mL with another beaker of 50 mL. Both are clear solutions. The solutions turn bright blue when put in the same container.
Is this a chemical or physical change? Explain.
This is a chemical change because there was a color change from 2 clear solutions.
Laura found out the weight of an apple is 100 g. She cut up the apple and weighed it again. How much did the apple weigh?
100 g
This element has 15 protons and 16 neutrons and 15 electrons
Phosphorus
Evie states the following:
- elements and compounds are considered mixtures
- mixtures contain at least 3 or more substances
- Pure substances can be separated using physical means
- mixtures are substances that are not chemically combined
Which of her statements are correct?
These have properties of both metals and non metals
Metalloids
Tatiana states the following:
- Physical changes can be a change in texture or shape, such as melting ice or forming a precipitate.
What is her mistake?
Forming a precipitate is a chemical change.
Ms. Goodson creates a reaction with 2 grams of methane and 4 grams of chlorine. The products are carbon chlorine and hydrochloric acid. How much do the products weigh together?
4 grams + 2 grams = 6 grams
Lenna says the following about Argon:
- It has 18 protons in the nucleus
- It has 18 electrons in the nucleus
- Its atomic mass is 39.95
What is her mistake?
Electrons are not in the nucleus
Write an example of an element, compound, and mixture
Answers will vary
Non metals are located on this part of the periodic table
To the right of metalloids/right side
Write down 3 indicators of a chemical change and an example of each
1. Forms a precipitate
2. Forms bubbles/gas
3. Change in temperature
4. Change in color
5. Formation of light
Catherine performed an experiment that produced gas bubbles. She weighed the reactants and they weighed 24 grams. She weighed the products and they weighed 20 grams. How is this possible?
Some of the mass was lost through the reactions as gas bubbles.