Jordans law powerpoint_2
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The document discusses the law of conservation of matter, which states that the total mass of a chemical reaction remains the same even as the substances change form. It provides examples like rust forming or cooking eggs, where the total mass before and after the reaction is equal. The document also shows a chemical equation for methane and oxygen reacting to form carbon dioxide and water, illustrating how the total mass is conserved during the reaction.
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Unit b matter and chemical change notes(physical & chemical changes)
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A physical change is a change in which no new substances are formed and the physical properties remain the same, making most physical changes reversible. Examples of physical changes include changes of state, such as water changing between liquid, solid, and gas forms, as well as changes in density or shape. A chemical change involves a chemical reaction that produces new chemical substances and is typically irreversible.
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1) Cutting Grass - Physical
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Physical changes alter a substance's appearance or structure but do not change its chemical composition. Examples include melting, freezing, and dissolving. Chemical changes form new substances with different properties through rearrangement of atoms, as seen in rusting, burning, and cooking. Evidence of a chemical change may include production of a gas, change in temperature, formation of a precipitate, or color change. A chemical change can be confirmed if the products of a chemical equation are different from the reactants.
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Chemical and Physical Changes
A physical change alters a substance's physical properties like shape, size, or state, but does not create new substances. A chemical change produces new substances through chemical reactions, altering both physical and chemical properties. Some key differences are that physical changes are typically reversible without new substances forming, while chemical changes are permanent reactions that form new substances through energy absorption or release. Rusting of iron is a chemical change that occurs when iron reacts with oxygen and water in the air, forming hydrated iron oxide (rust) which damages the iron over time.
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The document describes the main components of a cell and their functions. The endoplasmic reticulum transports materials throughout the cell, the nucleus contains DNA and controls cell functions, and the mitochondria releases energy to power cell activities. Other parts include the cell membrane, cytoplasm, ribosomes, vacuoles, chloroplasts, and the nuclear membrane surrounding the nucleus.
Goods and bad’s of chemicals
The document discusses both the positive and negative effects of chemicals. Positively, chemicals like preservatives help preserve food, medicines treat illnesses, fertilizers promote plant growth, and pesticides kill pests. However, some chemicals can cause allergies or food intolerance. While preservatives preserve food, they can harm the body. Fertilizers and pesticides also hurt the environment as runoff can pollute drinking water and make people or plants sick.
Harmful chemicals
This document discusses several harmful chemicals and the diseases they can cause. It explains that cancer is caused by abnormal cell growth and can affect different organs. Carcinogens like those in tobacco can cause lung cancer. Exposure to chemicals like alcohol and drugs while pregnant can harm the unborn child and cause issues like fetal alcohol syndrome. Heart disease, a leading cause of death, occurs when arteries are narrowed by chemicals like cholesterol. Kidney disease can also result from chemicals damaging the kidneys.
Identifing chemicals
This document discusses the key concepts of chemicals, matter, and elements. It defines a chemical as a substance formed through a chemical process. Matter is anything that has mass or volume. Elements are the most basic substances that substances can be broken down into. The document also distinguishes between natural elements that exist in nature and synthetic elements created by scientists.
Ddt concentation
DDT concentration increases greatly as it moves up the food chain. Specifically, DDT concentration increased more than 8 million times between lower and higher levels of the food chain. This demonstrates how toxins can bioaccumulate in organisms that consume other organisms and become concentrated at each level.
Gabe and david pp
The document discusses the risks and benefits of chemicals used for sanitation and food preservation. It describes how sanitation aims to treat wastewater to make it safe for human and environmental use through removal of contaminants. It also explains that food preservatives have been used for centuries to inhibit microbial growth that causes spoilage, with common preservatives being salt and vinegar which both chemically prohibit spoilage microorganisms.
Sarah and abigail power point
Chemicals can be defined as substances that have a definite composition and are formed through chemical processes. Water is made up of the same two substances, hydrogen and oxygen, in the same proportions regardless of where it is found. Matter is anything that takes up space and has mass, while mass is the amount of matter in a substance and volume is the space it occupies. Elements are substances that cannot be broken down further, mixtures are combinations of substances that are not chemically joined, and compounds form when elements chemically combine.
Project chris and tirth
Harmful chemicals can cause several diseases and disorders including cancer, birth defects, heart disease, kidney disease, and asthma. Cancer is caused by abnormal cell growth that can affect specific organs. Birth defects may occur if a woman smokes, drinks alcohol, or uses drugs during pregnancy which can cause problems like cleft lip or palate. Heart disease develops when arteries that supply blood to the heart are narrowed or blocked. Kidney disease may happen when chemicals harm the kidneys' ability to filter waste from the blood. Asthma involves difficulty breathing due to swollen, inflamed air passages in the lungs.
Science lesson 33 powerpoint jc,will,zach
The document discusses the effects of chemicals on organisms, using DDT as an example. It explains that while DDT was initially produced to act as an effective pesticide, saving many lives, it was later discovered to negatively impact bird populations. The document also defines key concepts like dose, potency, exposure time, individual susceptibility, and chemical concentration that determine how chemicals impact organisms.
Jordans law powerpoint
The document discusses the law of conservation of matter, which states that the total mass of a chemical reaction remains the same even as the substances change form. It provides examples like rust forming or cooking eggs, where the total mass before and after the reaction is equal. The document also shows a chemical equation of methane and oxygen reacting to form carbon dioxide and water, with the total mass on both sides of the equation being equal.
Ic kelly and kristina
Physical properties like density, melting and boiling points, and specific heat can be used to identify substances. Density is a substance's mass per unit volume. Melting point is the temperature when a solid turns to a liquid, while boiling point is when a liquid turns to a gas. Specific heat is the amount of heat needed to raise the temperature of a substance. Solubility measures how well a substance dissolves in another, and chemical properties describe how a substance changes under certain conditions like reactivity.
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Scientific investigations, reporting and analyzing data,
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Jordans law powerpoint_2
- 1. The Conservation Of Matter By:Jordan Faw, Warren Breden, and Jacob Hamby
- 4. Another example would be when you cook something like eggs or you bake bread it will still weigh the same when it's done.
- 6. Even though the chemicals have reacted and changed into something completely different there is still the same amount of mass.