Adding 3 or More Addends

Covalent Molecules and Compounds Just as an atom is the simplest unit that has the fundamental chemical properties of an element, a molecule is the simplest unit that has the fundamental chemical properties of a covalent compound. Some pure elements exist as covalent molecules. Hydrogen, nitrogen, oxygen, and the halogens occur naturally as the diatomic (“two atoms”) molecules H2, N2, O2, F2, Cl2, Br2, and I2 (part (a) in Figure 3.1.1). Similarly, a few pure elements exist as polyatomic (“many atoms”) molecules, such as elemental phosphorus and sulfur, which occur as P4 and S8 (part (b) in Figure 3.1.1). Each covalent compound is represented by a molecular formula, which gives the atomic symbol for each component element, in a prescribed order, accompanied by a subscript indicating the number of atoms of that element in the molecule. The subscript is written only if the number of atoms is greater than 1. For example, water, with two hydrogen atoms and one oxygen atom per molecule, is written as H2O. Similarly, carbon dioxide, which contains one carbon atom and two oxygen atoms in each molecule, is written as CO2. Covalent compounds that predominantly contain carbon and hydrogen are called organic compounds. The convention for representing the formulas of organic compounds is to write carbon first, followed by hydrogen and then any other elements in alphabetical order (e.g., CH4O is methyl alcohol, a fuel). Compounds that consist primarily of elements other than carbon and hydrogen are called inorganic compounds; they include both covalent and ionic compounds. In inorganic compounds, the component elements are listed beginning with the one farthest to the left in the periodic table, as in CO2 or SF6. Those in the same group are listed beginning with the lower element and working up, as in ClF. By convention, however, when an inorganic compound contains both hydrogen and an element from groups 13–15, hydrogen is usually listed last in the formula. Examples are ammonia (NH3) and silane (SiH4). Compounds such as water, whose compositions were established long before this convention was adopted, are always written with hydrogen first: Water is always written as H2O, not OH2. The conventions for inorganic acids, such as hydrochloric acid (HCl) and sulfuric acid (H2SO4), are described elswhere. Note! For organic compounds: write C first, then H, and then the other elements in alphabetical order. For molecular inorganic compounds: start with the element at far left in the periodic table; list elements in same group beginning with the lower element and working up. Write the molecular formula of each compound. a. The phosphorus-sulfur compound that is responsible for the ignition of so-called strike anywhere matches has 4 phosphorus atoms and 3 sulfur atoms per molecule. b. Ethyl alcohol, the alcohol of alcoholic beverages, has 1 oxygen atom, 2 carbon atoms, and 6 hydrogen atoms per molecule. c. Freon-11, once widely used in automobile air conditioners and implicated in damage to the ozone layer, has 1 carbon atom, 3 chlorine atoms, and 1 fluorine atom per molecule. Solution: a. • A The molecule has 4 phosphorus atoms and 3 sulfur atoms. Because the compound does not contain mostly carbon and hydrogen, it is inorganic. • B Phosphorus is in group 15, and sulfur is in group 16. Because phosphorus is to the left of sulfur, it is written first. • C Writing the number of each kind of atom as a right-hand subscript gives P4S3 as the molecular formula. b. • A Ethyl alcohol contains predominantly carbon and hydrogen, so it is an organic compound. • B The formula for an organic compound is written with the number of carbon atoms first, the number of hydrogen atoms next, and the other atoms in alphabetical order: CHO. • C Adding subscripts gives the molecular formula C2H6O. c. • A Freon-11 contains carbon, chlorine, and fluorine. It can be viewed as either an inorganic compound or an organic compound (in which fluorine has replaced hydrogen). The formula for Freon-11 can therefore be written using either of the two conventions. • B According to the convention for inorganic compounds, carbon is written first because it is farther left in the periodic table. Fluorine and chlorine are in the same group, so they are listed beginning with the lower element and working up: CClF. Adding subscripts gives the molecular formula CCl3F. • C We obtain the same formula for Freon-11 using the convention for organic compounds. The number of carbon atoms is written first, followed by the number of hydrogen atoms (zero) and then the other elements in alphabetical order, also giving CCl3F. Write the molecular formula for each compound. a. Nitrous oxide, also called “laughing gas,” has 2 nitrogen atoms and 1 oxygen atom per molecule. Nitrous oxide is used as a mild anesthetic for minor surgery and as the propellant in cans of whipped cream. b. Sucrose, also known as cane sugar, has 12 carbon atoms, 11 oxygen atoms, and 22 hydrogen atoms. c. Sulfur hexafluoride, a gas used to pressurize “unpressurized” tennis balls and as a coolant in nuclear reactors, has 6 fluorine atoms and 1 sulfur atom per molecule. Answer: a. N2O b. C12H22O11 c. SF6. Ionic Compounds The substances described in the preceding discussion are composed of molecules that are electrically neutral; that is, the number of positively-charged protons in the nucleus is equal to the number of negatively-charged electrons. In contrast, ions are atoms or assemblies of atoms that have a net electrical charge. Ions that contain fewer electrons than protons have a net positive charge and are called cations. Conversely, ions that contain more electrons than protons have a net negative charge and are called anions. Ionic compounds contain both cations and anions in a ratio that results in no net electrical charge. Note! Ionic compounds contain both cations and anions in a ratio that results in zero electrical charge.An ionic compound that contains only two elements, one present as a cation and one as an anion, is called a binary ionic compound. One example is MgCl2, a coagulant used in the preparation of tofu from soybeans. For binary ionic compounds, the subscripts in the empirical formula can also be obtained by crossing charges: use the absolute value of the charge on one ion as the subscript for the other ion. This method is shown schematically as follows: Crossing charges. One method for obtaining subscripts in the empirical formula is by crossing charges. When crossing charges, it is sometimes necessary to reduce the subscripts to their simplest ratio to write the empirical formula. Consider, for example, the compound formed by Mg2+ and O2−. Using the absolute values of the charges on the ions as subscripts gives the formula Mg2O2:Polyatomic Ions Polyatomic ions are groups of atoms that bear net electrical charges, although the atoms in a polyatomic ion are held together by the same covalent bonds that hold atoms together in molecules. Just as there are many more kinds of molecules than simple elements, there are many more kinds of polyatomic ions than monatomic ions. Two examples of polyatomic cations are the ammonium (NH4+) and the methylammonium (CH3NH3+) ions. P. The method used to predict the empirical formulas for ionic compounds that contain monatomic ions can also be used for compounds that contain polyatomic ions. The overall charge on the cations must balance the overall charge on the anions in the formula unit. Thus, K+ and NO3− ions combine in a 1:1 ratio to form KNO3 (potassium nitrate or saltpeter), a major ingredient in black gunpowder. Similarly, Ca2+ and SO42− form CaSO4 (calcium sulfate), which combines with varying amounts of water to form gypsum and plaster of Paris. The polyatomic ions NH4+ and NO3− form NH4NO3 (ammonium nitrate), a widely used fertilizer and, in the wrong hands, an explosive. One example of a compound in which the ions have charges of different magnitudes is calcium phosphate, which is composed of Ca2+ and PO43− ions; it is a major component of bones. The compound is electrically neutral because the ions combine in a ratio of three Ca2+ ions [3(+2) = +6] for every two ions [2(−3) = −6], giving an empirical formula of Ca3(PO4)2; the parentheses around PO4 in the empirical formula indicate that it is a polyatomic ion. Writing the formula for calcium phosphate as Ca3P2O8 gives the correct number of each atom in the formula unit, but it obscures the fact that the compound contains readily identifiable PO43− ions.Summary • There are two fundamentally different kinds of chemical bonds (covalent and ionic) that cause substances to have very different properties. • The composition of a compound is represented by an empirical or molecular formula, each consisting of at least one formula unit.Contributors The atoms in chemical compounds are held together by attractive electrostatic interactions known as chemical bonds. Ionic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero. The ions are held together in a regular spatial arrangement by electrostatic forces. Most covalent compounds consist of molecules, groups of atoms in which one or more pairs of electrons are shared by at least two atoms to form a covalent bond. The atoms in molecules are held together by the electrostatic attraction between the positively charged nuclei of the bonded atoms and the negatively charged electrons shared by the nuclei. The molecular formula of a covalent compound gives the types and numbers of atoms present. Compounds that contain predominantly carbon and hydrogen are called organic compounds, whereas compounds that consist primarily of elements other than carbon and hydrogen are inorganic compounds. Diatomic molecules contain two atoms, and polyatomic molecules contain more than two. A structural formula indicates the composition and approximate structure and shape of a molecule. Single bonds, double bonds, and triple bonds are covalent bonds in which one, two, and three pairs of electrons, respectively, are shared between two bonded atoms. Atoms or groups of atoms that possess a net electrical charge are called ions; they can have either a positive charge (cations) or a negative charge (anions). Ions can consist of one atom (monatomic ions) or several (polyatomic ions). The charges on monatomic ions of most main group elements can be predicted from the location of the element in the periodic table. Ionic compounds usually form hard crystalline solids with high melting points. Covalent molecular compounds, in contrast, consist of discrete molecules held together by weak intermolecular forces and can be gases, liquids, or solids at room temperature and pressure. An empirical formula gives the relative numbers of atoms of the elements in a compound, reduced to the lowest whole numbers. The formula unit is the absolute grouping represented by the empirical formula of a compound, either ionic or covalent. Empirical formulas are particularly useful for describing the composition of ionic compounds, which do not contain readily identifiable molecules. Some ionic compounds occur as hydrates, which contain specific ratios of loosely bound water molecules called waters of hydration.

Conservation means prevention of loss or damage to something. Conservation of natural resources means keeping or managing and preventing our natural resources from being wasted, damaged or going into extinction, that is disappearing. Natural resources are nature’s gifts to human beings. Therefore, we should keep and manage them well. WHY NATURAL RESOURCES SHOULD BE CONSERVED(MANAGED): The following are the reasons why natural resources should be conserved(managed): 1. To prevent waste of our resources. 2. To preserve them for future use, For examples Land, trees etc. 3. To generate more income and develop our economy. For example, Zoological gardens, mineral resources and tourist centres like Ikogosi warm and cold-water spring. 4. To prevent some rare birds and animals from going into extinction (stop existing). 5. To prevent erosion. This is because these trees help to hold the soil and prevent it from being washed away easily by erosion. HOW TO MANAGE (CONSERVE) OUR NATURAL RESOURCES. The following are ways to manage our natural resources: 1. Avoiding bush burning. 2. Tree planting should be encouraged. 3. Creation of more games reserves like Yankari Game Reserve. 4. Avoiding of oil spillage and dumping of wastes into drains. 5. Adding of manures and fertilizers to enrich our soil.

1. Which factor is most crucial to verify first when selecting an ICT resource for instruction? A) Content alignment with the textbook B) Alignment with learning objectives C) The resource's popularity among peers D) Cost-effectiveness of the resource 2. When evaluating ICT resources, what is the purpose of checking cultural relevance? A) Ensuring it aligns with current trends B) Making sure it's accessible to all students C) Reflecting the diverse backgrounds of students D) Avoiding resources that are too complex 3. Which key aspect determines the accessibility of an ICT resource? A) How popular the resource is with students B) Its compatibility with existing technology C) Cost of using the resource D) Engagement levels it provides 4. In assessing content quality, why is accuracy important? A) To make resources easier to use B) To ensure alignment with curriculum standards C) To enhance visual appeal D) To provide a more engaging experience 5. Why is it essential for an ICT resource to offer interactivity? A) To improve download speeds B) To promote active learning and engagement C) To meet all technical requirements D) To minimize costs associated with the resource 6. What should be assessed regarding the usability of an ICT resource? A) How much it costs compared to other resources B) How easily students can navigate and use it C) How interactive it is D) Its level of engagement 7. Which of the following best describes the importance of feedback mechanisms in ICT resources? A) They reduce the need for grading B) They allow for automatic updates C) They provide immediate feedback to enhance learning D) They increase the cost-effectiveness of the resource 8. What is an advantage of resources that are scalable and flexible? A) They can adapt to different class sizes or teaching methods B) They are often free C) They do not require technical support D) They are easier to assess 9. Which tool would you use to gain structured feedback from students about an ICT resource? A) Rubrics B) Peer reviews C) Online review platforms D) Student feedback 10. When is a checklist most beneficial in evaluating an ICT resource? A) To provide structured guidelines for scoring B) For highlighting key features and requirements C) To measure student engagement D) To analyze technical support needs 11. Which of these tools helps teachers gather insights from colleagues on a resource's effectiveness? A) Online review platforms B) Student feedback C) Peer review D) Rubrics 12. In the planning stage, how can ICT benefit lesson development? A) By providing only audio resources B) By assisting in research for updated content C) By reducing the need for lesson objectives D) By limiting content access 13. During content delivery, how does ICT enhance the lesson experience? A) By allowing remote control of student devices B) By adding interactivity and visual elements C) By only focusing on text-based resources D) By limiting engagement 14. What is a key advantage of using ICT-based assessment tools? A) Reducing the need for reflection B) Tracking student progress and providing feedback C) Replacing lesson objectives D) Focusing solely on multiple-choice questions 15. Which ICT feature is most beneficial in the reflection stage of a lesson? A) Technical support options B) Feedback mechanisms for immediate assessment C) Tools for students to document learning, like online portfolios D) Interactive quizzes 16. How does ICT aid in skill development? A) By encouraging only memorization B) By fostering digital literacy and critical thinking C) By minimizing interactions with the teacher D) By restricting content variety 17. What does a cost-effective ICT resource entail? A) Being free of charge for all students B) Offering a good balance of educational value and cost C) Having the most features available D) Minimizing interactivity to reduce expenses 18. Why is teacher training crucial in ICT integration? A) To learn troubleshooting for technical issues B) To help only in the planning stage C) To reduce the need for ICT support D) To assess the cultural relevance of ICT tools 19. What challenge might schools face in accessing ICT resources? A) Lack of teacher motivation B) Availability of devices and internet connectivity C) High levels of student engagement D) Excessive interactivity 20. Why should teachers regularly evaluate the ICT resources they use? A) To determine if students enjoy using them B) To assess cost-effectiveness only C) To ensure resources remain effective and up-to-date D) To simplify lesson planning

Nutrition Notes Nutrition- study of how your body uses food Process by which body uses nutrients How you look and feel Resist diseases and illness How you perform physically and mentally Nutrients: substances in food your body needs to grow, repair and supply energy to your body cells 6 Classes of Nutrients 1.Carbohydrates: 1 gram= 4 calories 2. Protein: 1 gram- 4 calories 3. Fats: 1 gram= 9 calories 4.Water 5. Vitamins 6. Minerals Calorie: measurement of energy in food Metabolism: Rate at which body burns energy(calories) Hunger: physical drive to eat Appetite: pshycological desire for food What influences your food choices: Foods you like Health Reasons Family and Culture Time & Money Advertising Emotions Friends Social Media: Modeling Nutrients Carbohydrates: your body’s main source of energy sugars/starches in food 45%-65% of diet #1 source of energy Simple: sugars converted to glucose= energy (fruits, dairy, honey, some manufactured foods) Complex: sugars linked together (starches) (grains, bread, pasta, beans, vegetables) Fiber: tough, indigestible carbohydrates Cleans our digestive system Prevents some types of cancer Prevents heart disease (fruits, vegetables, whole grains,nuts) 2. Protein: growth and repair of body tissues Made up of chemicals called “amino acids” Basic building material of all body cells (muscles, bones, skin, internal organs) Secondary source of energy protein(hemoglobin) attaches to oxygen in blood Functions as hormones regulating body functions 10-15% of diet *Body uses 20 Amino Acids found in food ( body produces 11 and 9 must come from diet) Essential amino acids: 9 amino acids body doesn't produce Complete Amino Acids: foods that contain all 9 essential amino acids ( animal products) Incomplete Amino Acids: food products that do not contain all 9 essential amino acids. Fats 15-25% of diet Secondary source of energy Blood clotting Controlling inflammation Maintains healthy skin/hair absorb /transport fat soluble vitamins Regulates body temperature Types of Fat Unsaturated: “good” fat Liquid at room temperature Can help fight heart disease (veg oil, nuts) Saturated: “bad” fat Solid at room temp Clogs arteries Causes strokes, heart attack, diabetes (animal products, meat, dairy) Cholesterol: waxy like fat substance found in meat products HDL: good type of cholesterol Body creates(liver) Creates cell wall, hormones, and vit D LDL: bad cholesterol- found in foods (clogs arteries) 4. Trans Fat: “one of the worst type of fats” Formed by a process called “hydrogenation”: adding Hydrogen molecules to unsaturated fats to make it more solid and resistant to chemical change. Vitamins A vitamin is a chemical compound that is needed in small amounts for the human body to work correctly. Vitamins are classified as either fat soluble (vitamins A, D, E and K) or water soluble (vitamins B and C). This difference between the two groups is very important. It determines how each vitamin acts within the body. The fat soluble vitamins are soluble in lipids (fats). Fat soluble vitamins can be stored in our body Water soluble vitamins must be taken every day Human body produces some amounts of Vitamin D & K

There are 12 core values at BTS, with 4 core values being “non-negotiables”. Each of the 12 core values are categorized into 3 main groups, Permission to Play, Architect of the Future, and Guardian of the Mood, to further encapsulate the broader aspects of BTS's work culture. The 4 non-negotiables: Being Super Hungry: This value underscores an intrinsic motivation and a relentless pursuit of goals. It reflects an individual's aspiration to continually strive for success, always seeking opportunities to grow and excel. Strong Willingness to Learn: This value promotes a continuous desire for personal and professional growth. It represents an open-minded approach to acquiring new skills and knowledge, which is critical in the ever-evolving field of taxation and financial services. Burning Desire for an Abundant Lifestyle: This value aligns well with the firm's vision and mission. It showcases a passionate pursuit of a prosperous life, not just in terms of financial wealth but a comprehensive approach to abundance, involving personal well-being and satisfaction. Burning Desire to be the Best: This embodies the drive to excel and be at the forefront in one’s area of expertise. It encourages individuals to strive for excellence, setting the bar high and aiming to surpass it, fostering a culture of competitiveness and high performance. Permission to Play: This category delineates the foundational qualities BTS seeks in potential team members, reflecting a blend of passion, humility, presence, and aspiration for a prosperous life. Super Hungry: Being "Super Hungry" transcends personal ambition, creating an environment where passion and determination are contagious. It's about fostering an ecosystem of perpetual growth, where individuals are fervently working towards their goals while uplifting others. It represents a spirit of resilience and relentless forward motion, fostering a collective progress where success is a shared journey. Humble and Humility: Embracing humility is the cornerstone of personal and organizational growth at BTS. It encourages individuals to remain open to learning and receptive to constructive criticism, fostering a culture of continuous improvement. Humility embodies a willingness to relinquish ego, embracing the learnings that come through experiences and guidance. It cultivates a space where personal growth is accelerated through mutual respect and collaborative learning, ultimately paving the way for success. Burning Desire for an Abundant Lifestyle: This core value embodies a holistic pursuit of happiness, where individuals strive to find joy and fulfillment in various facets of life, including work, personal relationships, and mental well-being. It encourages a balanced approach to life, where passion for work aligns with personal joy, fostering a workplace where individuals are deeply committed and engaged in their roles, finding contentment and happiness in their professional pursuits. Being Fully Present and Inspiring: Being fully present encourages individuals to immerse themselves wholly in their tasks, minimizing distractions and maximizing productivity. It fosters a workplace where people are engaged, content, and genuinely invested in their roles. Simultaneously, nurturing an inspiring environment is about personal growth and self-motivation, where individuals are the driving forces behind their success, igniting inspiration through their journey and accomplishments, fostering a cycle of mutual motivation and growth. Architect of the Future: This category is about the cultivation of leaders within the team, encouraging qualities such as self-drive, innovation (revolutionist), a strong willingness to learn, and an unyielding desire to be the best in their field. Being Self-Driven: A self-driven individual embodies responsibility and initiative, equipped with a clear vision and a proactive approach to achieving their goals. They are fervent in bridging the gap between their present and envisioned future, fostering a goal-oriented mindset that is aggressive in its pursuit and focused on accomplishing its objectives. Being a Revolutionist: A revolutionist in the BTS context is an innovator, willing to defy conventional norms and embrace new approaches to foster growth and development. They are vocal advocates for change, bringing unique perspectives and solutions to the table, fostering an environment of innovation and progressive thinking. Even amidst resistance, they hold firm to their vision, aligning their actions with the core values and purpose that guide BTS's mission. Strong Willingness to Learn: An individual with a strong willingness to learn is adaptable, constantly evolving to meet the changing demands of the industry. They are voracious learners, continually seeking knowledge to enhance their expertise, thereby adding value to the clients and the organization. Burning Desire to be the Best: This value is about embodying excellence in every endeavor, fostering a culture where individuals are constantly striving to elevate their expertise and services. It encourages a proactive approach to personal and professional growth, where the quest for greatness is a continuous journey, propelled by learning and innovation. Guardian of the Mood: This focuses on maintaining a positive and collaborative work environment, emphasizing values such as gratefulness, patience, excitement, and helpfulness. It suggests that BTS values not only professional excellence but also emotional intelligence and positive interpersonal interactions. Being Grateful: Being grateful at BTS embodies a conscious appreciation of the opportunities and resources at hand. It encourages individuals to not just focus on personal milestones but to recognize and value the collective efforts and accomplishments of the team. It's about harboring a mindset of thankfulness that permeates everyday life, understanding that the privilege to progress and succeed is not to be taken for granted. This attitude fosters a nurturing environment where gratitude amplifies abundance, paving the way for more blessings and opportunities to flourish. Patience: Patience at BTS embodies a multifaceted approach that encompasses trust, readiness to play a role effectively, striving to reach one's potential, a hunger for success, and a helpful disposition. It encourages individuals to cultivate a patient attitude, fostering a work environment where goals are pursued with persistence and determination. Genuine Excitement: Genuine excitement at BTS manifests as a contagious enthusiasm that permeates the organization. It is characterized by a deep-seated passion for one's work, fostering a positive and vibrant work environment where individuals are energized and motivated to make a meaningful impact through their roles. Being Helpful: Being helpful at BTS entails proactively identifying opportunities to assist, be it in aiding clients with their concerns or supporting team members in their roles. It fosters a collaborative and supportive work environment, where individuals are attuned to the needs of others and are ready to step in to provide assistance.

Type 3: Spelling (adding -ed or -ing)

Type 3: Spelling: Adding -ed or -ing

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