Elements, Compounds & Mixtures
A pure substance can be broken down into two categories...
a) Elements , and mixtures
b) Elements and compounds
c) Homogenous and heterogenous mixtures
d) Molecules and atoms
b) Elements and compounds
This element is in Group 1, Period 2. It’s a soft, highly reactive metal often found in batteries.
What is Lithium (Li)
What is the name of the "staircase" family that share properties of metals and non metals?
Metalloids
A student builds a model of an atom with small neutral particles and positively charged particles in the center, what is the center of the atom called?
The nucleus
Calcium is added to water and produces bubbles of gas, but the reaction is not as dramatic as potassium.
Which family does calcium belong to?
Alkaline Earth Metals (Group 2) – Reactive metals, but less so than alkali metals.
A student is examining a piece of copper wire. It’s shiny, can conduct electricity, and is made of only one type of atom. Is copper an element, a compound, or a mixture?
An Element — Copper is an element because it contains only one type of atom (Cu) and cannot be chemically broken down into simpler substances.
This element is in Group 17, Period 3. It’s a yellow-green gas used to disinfect pools.
What is Chlorine (Cl)
A student carefully observes a shiny, soft metal that reacts violently when dropped into water.
Which family does this element belong to?
Alkali metals (Group 1) – Very reactive, soft metals.
______ are positive
______ are negative
______ hold no charge.
Maya’s kitchen has aluminum foil that she uses to cover leftovers. She notices that it’s shiny, bends easily, and doesn’t break when she folds it.
Which family does aluminum belong to?
A) Metals
B) Non-metals
C) Alkali metals
D) Noble gases
A) Metals
A chemist is making a new sports drink by mixing water, electrolytes, and flavoring. When poured into a clear glass, the solution looks the same throughout.
What type of mixture does the chemist create?
Homogeneous mixture
An element in Group 2, Period 4 is a shiny metal that burns with a bright white flame and is used in fireworks.
Calcium (Ca)
In a chemistry demonstration, a teacher shows a sample of sulfur and asks students to touch it. They notice it’s dull, crumbly, and doesn’t conduct electricity.
Sulfur is an example of:
A) Metal
B) Non-metal
C) Alkali metal
D) Noble gas
B) Non-metal
Which of the following is FALSE?
a) The proton holds a positive charge
b) Electrons are found in the nucleus
c) Protons are found in the nucleus
d) Neutrons are found in the nucleus
b) Electrons are found in the nucleus
A student notices that her copper cooking pot heats up quickly when placed on the stove. It’s shiny and can be bent slightly without breaking.
True or False: Copper is a metal.
True
A hiker packs trail mix for a long trip. He notices nuts, dried fruits, and chocolate pieces in separate colors and shapes in the same container.
Multiple Choice: The trail mix is an example of:
A) Element
B) Compound
C) Homogeneous mixture
D) Heterogeneous mixture
D) Heterogeneous mixture
I’m a strong, magnetic metal used in construction and found in your blood. Who am I and what group and period number am I found in?
What is Iron (Fe) — Group 8, Period 4
A chemistry lab tests magnesium by dropping it into water. The reaction is noticeable but much less vigorous than lithium or sodium. Which family does magnesium belong to?
Alkaline Earth Metals (Group 2)
A scientist examines an unknown atom. She notes that it has positively charged particles and neutral particles tightly packed in the center, while tiny negatively charged particles fly around the outside. She wonders what each part is called.
Which of the following correctly identifies the parts of the atom?
A) Protons and neutrons in the nucleus; electrons orbit outside
B) Electrons and neutrons in the nucleus; protons orbit outside
C) Protons orbit outside; electrons and neutrons in the nucleus
D) Neutrons orbit outside; protons and electrons in the nucleus
A) Protons and neutrons in the nucleus; electrons orbit outside
A teacher gives students a list of elements and asks them to identify the one that belongs to the correct family based on its properties.
Which of the following is true?
A) Sodium is a halogen (Group 17)
B) Neon is a noble gas (Group 18)
C) Magnesium is a halogen (Group 17)
D) Chlorine is an alkali metal (Group 1)
B) Neon is a noble gas (Group 18)
Scenario: Jamie is at the grocery store and buys a bag of table salt. Later, he sees that the salt is made of tiny crystals, all looking identical. He wonders if each crystal is made of one substance or more.
True or False: Table salt (NaCl) is an element.
False - NaCl is a compound
I’m an essential mineral found in bananas and sports drinks. I’m part of the alkali metal family and react strongly with water. Who am I and what group and period number am I found in?
What is Potassium (K) — Group 1, Period 4
In a school demonstration, a teacher compares fluorine and chlorine to helium. Fluorine reacts strongly with many substances, while helium does not react at all.
Which statement is true?
A) Fluorine is a noble gas, helium is a halogen.
B) Both are halogens.
C) Fluorine is a halogen, helium is a noble gas.
D) Both are noble gases.
C) Fluorine is a halogen, helium is a noble gas – Halogens are very reactive; noble gases are unreactive.
Samantha is building a model of an atom for her science project. She learns that tiny negatively charged particles called ____ fly in ____ outside of the nucleus.
electrons, orbits
In a chemistry experiment, students observe chlorine bubbling through water, reacting with it, while a balloon filled with neon just floats harmlessly.
Which statement is correct?
A) Chlorine is a halogen, neon is a noble gas.
B) Chlorine is a noble gas, neon is a halogen.
C) Both are noble gases.
D) Both are halogens.
A) Chlorine is a halogen, neon is a noble gas.