BASIS AHWATUKEE Chemistry 7 Study Guide

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Questions and Answers

What is the correct suffix to add to a nonmetal when naming a binary compound?

-ate

-ic

-ous

-ide (correct)

Which step is NOT part of the process for naming Type II Binary Compounds?

Use a Roman Numeral for the charge

Add 'mono-' prefix to the first element (correct)

Change suffix of nonmetal to -ide

Write element name of metal

What should be used to indicate the charge of a transition metal in a Type II binary compound?

A subscript

A Roman Numeral (correct)

An oxidation state

A coefficient

In covalent compound naming, which prefix is never used for the first element?

mono- Signup and view all the answers

When drawing Lewis Dot Structures, what does each dot represent?

A valence electron Signup and view all the answers

What is indicated by a line in a covalent compound's Lewis Structure?

Two shared electrons Signup and view all the answers

Which of the following steps is used when naming a compound with a polyatomic ion acting as a metal?

Name the polyatomic ion first Signup and view all the answers

Which of the following is a rule for counting significant figures?

Leading zeros do not count as significant figures Signup and view all the answers

What type of mixture is made up of two or more substances that are uniform in composition but may have variable proportions?

Homogeneous mixture Signup and view all the answers

Which statement correctly describes a property of gas?

Indefinite shape and volume Signup and view all the answers

Which substance cannot be broken down by chemical means?

Element Signup and view all the answers

What is the correct classification of the boiling point of a substance?

Physical property Signup and view all the answers

How is a solution defined in terms of its composition?

A homogeneous liquid mixture of a heterogeneous liquid Signup and view all the answers

Which of the following is an example of a chemical change?

Burning gasoline Signup and view all the answers

What property describes a substance that has a sour taste?

Chemical property Signup and view all the answers

What describes the energy state of a solid compared to other states of matter?

Lowest energy state of matter Signup and view all the answers

What do dashes represent in a Lewis Structure?

Two valence electrons bonding between compounds Signup and view all the answers

How many total valence electrons are present in the compound HCl?

10 Signup and view all the answers

Which element does not require an octet for stability?

Hydrogen Signup and view all the answers

Which of the following compounds contains 8 valence electrons?

O2 Signup and view all the answers

What is the significance of the octet rule in relation to chemical stability?

Atoms achieve stability by having 8 electrons in their outer shell. Signup and view all the answers

Which of the following units is NOT typically used in Chemistry?

Meters Signup and view all the answers

What happens to a substance with greater density in a fluid?

It will sink Signup and view all the answers

Which statement best describes precision?

Shows consistency but may not be correct Signup and view all the answers

Which tool would be best for measuring volume precisely?

Graduated cylinder Signup and view all the answers

Which of the following is a characteristic of a heterogeneous mixture?

Can contain a suspension or precipitate Signup and view all the answers

Which separation technique utilizes boiling point differences?

Evaporation Signup and view all the answers

What does Archimedes' principle help to calculate?

Volume of an object using displacement Signup and view all the answers

Which of the following substances is a diatomic molecule?

Nitrogen Signup and view all the answers

When measuring volume, what is the correct position to look for the meniscus?

At the bottom of the curve Signup and view all the answers

How is density calculated from mass and volume?

Density = Mass / Volume Signup and view all the answers

What is the correct shorthand notation for Chlorine?

Cl: [Ne] 3s^2^3p^5^ Signup and view all the answers

Which of the following elements has 2 valence electrons based on its electron configuration?

Ca Signup and view all the answers

Which compound is classified as covalent?

N2O4 Signup and view all the answers

How many valence electrons does phosphorus possess?

5 Signup and view all the answers

What is the IUPAC name for the compound with the formula AlBr3?

Aluminum bromide Signup and view all the answers

What electron configuration corresponds to a Na+ ion?

[Ne] Signup and view all the answers

Which element has the electron configuration of 1s^2 2s^2 2p^2?

C Signup and view all the answers

Which of the following compounds is an example of an ionic compound?

PbCl2 Signup and view all the answers

Which statement correctly identifies a compound based on molecular distribution?

The molecules are chemically bonded together and evenly distributed. Signup and view all the answers

What is a distinguishing feature of an element?

It consists of only one type of atom. Signup and view all the answers

Which classification describes a substance with variable composition based on sample location?

Heterogeneous mixture Signup and view all the answers

How can a homogeneous mixture be identified?

The components are uniformly distributed throughout. Signup and view all the answers

What technique would best separate a solid from a liquid mixture?

Filtration Signup and view all the answers

Which separation technique is most suitable for purifying a liquid by separating it from soluble solids?

Evaporation Signup and view all the answers

What inference can be made about a sample described as a heterogeneous mixture?

The components are visibly distinguishable. Signup and view all the answers

In what way do the components of a compound interact compared to those in a mixture?

Components in a compound are chemically combined, while those in a mixture are not. Signup and view all the answers

Which diagram classification indicates a consistent atomic ratio throughout the substance?

Compound Signup and view all the answers

Which statement accurately describes a homogenous mixture?

It has a uniform overall composition. Signup and view all the answers

What characterization indicates the presence of a heterogeneous mixture?

Distinct phases or layers present Signup and view all the answers

Which separation technique utilizes differences in boiling points to separate components?

Distillation Signup and view all the answers

How does the classification of an element differ from a compound?

An element is made of one type of atom, while a compound contains multiple types. Signup and view all the answers

Study Notes

Pre-Comprehensive Study Guide

The study guide is for BASIS AHWATUKEE Chemistry 7 students.
Students should print their name and element on the page.
The Pre-Comp Periodic Table is in the packet.
A scientific calculator and periodic table are allowed during the exam.
The study guide is divided into two sections: Key Topics to Review and Practice Problems.
Key topics are reviewed in the study guide but more in-depth review of class notes is advised.
Practice problems provide good examples for the exam.
Study the entire study guide before starting work.
Prioritize studying weak topics.
Allocate about 20 minutes per session, 3-4 times a week.
Attend student hours for help.
Annotate the guide, highlighting key concepts and making notes.
Utilize previous worksheets, tests, and do nows for review.
Students are expected to take two exams called "Common" (written by BASIS) and "Native" (written by teacher).
The Common exam has 25 multiple choice questions.
The Native exam has 32 questions, which may include multiple choice and free response.
The exam time limit is 30 minutes.
The periodic table in the review packet will be used for the exam.

Helpful Reminders

Read the entire study guide before starting work.
Prioritize studying weak topics.
Allocate time (20 minutes nightly/3-4x a week)
Seek assistance from student hours if needed.
Carefully annotate the study guide with important concepts and notes.
Review prior assessments and assignments for further learning.

Lab Safety Rules

Always read and complete pre-lab assignments before experiments.
Be aware of potential experiment risks (flammability, toxicity).
Keep the work area clean and clear.
Handle glassware carefully and heating sources with caution.
Avoid horseplay in the lab.
Do not eat or drink in the laboratory.
Immediately inform the teacher of spills or breakages.
Under teacher’s supervision, ensure proper handling of chemicals.
Know the pathways a chemical can enter the body (absorption, ingestion, inhalation).
Prevent chemical entry through safe practices (e.g., safety goggles, closed-toe shoes).
Understand chemical safety symbols (Globally Harmonized System (GHS)).

Key Topics to Review

Be able to read and identify NFPA labels (identifying hazards via color codes).
Knowledge of emergency equipment: fire extinguisher, fire blanket, fire alarm, gas shutoff, safety shower, fume hood, and eye wash.
Properly identify and understand lab tools (mass balance, graduated cylinders, Erlenmeyer flask, beakers, test tubes, volumetric flasks, Bunsen burners, hot plates, watch glasses, pipettes, funnels, and thermometers).
Understand proper unit conversions between different units. (kilo-, deca-, milli, etc.) to base units
Define and understand accuracy and precision.
Understand measuring volume precisely; identify the meniscus and the tools that help measure volumes.
Understand Density, relationship between mass, volume and density.
Understand how to calculate density with only two of those given variables.
Identify which substance will sink based on its density.
Know the calculations related to Archimedes' Principle and Displacement.
How to classify substances as elements, compounds, homogeneous mixtures, or heterogeneous mixtures/
Understand the different parts of mixtures (solute, solvent).
Know different types of separation techniques (filtration, evaporation, chromatography, decantation).
Identify the characteristics of solids, liquids, and gases (energy, movement, shape, volume, distance between particles).
Understand various phase changes and energy changes(melting, vaporization, evaporation, condensation, freezing, sublimation, and deposition)
Understand the difference between physical and chemical changes and properties.
Identify the relationship between atoms, elements, compounds and mixtures
Knowing the atomic structure: protons, neutrons, electrons, isotopes, ions,etc.)
Knowing how to read the periodic table and classify as metals, non-metals or metalloids.
Knowing the various periodic trends (atomic radius, ionization energy, electronegativity),etc)
Oxidation number/Ionic charge
How to write different chemical formulas
Basic Lewis Dot structures
Name and write different chemical formulas of covalent and ionic compounds

Atomic Structure

Understand protons, neutrons and electrons
Understand that different number of neutrons gives atoms of the same element different masses
Understand that protons define the elements
Atoms are negatively charged
Know that isotopes are elements with different masses
Know what electrons have
Know that ionic charge depends on the number of electrons or protons

Reading the Periodic Table

Classify elements as metals, metalloids, or non-metals
Understand the elements location in rows (period) and columns (group/family)
Understand how to determine the number of valence electrons
Understand isotopes, ions

Periodic Trends

Be able to predict trends
Know the trends in atomic radius, ionization energy, electronegativity

Electron Configurations and Orbitals

Identify the number of valence electrons
Identify electron shells and sub shells
Know about the types of orbitals and their shapes

Families of the Periodic Table

Know the different families (Alkali metals, Alkaline Earth Metals, Transition Metals, Halogens, Noble Gases, Metalloids) and where they are located in the periodic table.
Be able to identify the elements that fall under each family

Unit Conversions

Understand conversions between different units.

Lab Safety and Measurement

How to identify different hazards in the lab (flammable, corrosive, toxic, explosive)
How to use different lab equipment precisely.
How to measure different substances using lab equipment

Significant Figures

Understand the rules for counting significant figures.
How to determine the number of significant figures in given values.

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Description

Prepare comprehensively for the BASIS AHWATUKEE Chemistry 7 exams with this detailed study guide. Review key topics, practice problems, and tips to enhance your understanding of the periodic table and calculations. Ensure you annotate and utilize past materials for a thorough preparation.