Physical and Chemical Changes
... Hardness: Compare hardness of objects by seeing which one would scratch the other. ...
... Hardness: Compare hardness of objects by seeing which one would scratch the other. ...
Chapter 1.1 –Chemistry is a Physical Science Chemistry is one of
... observe and describe matter. The same element or compound is present before and after the change. The same molecule is present throughout the changes. Physical changes are related to physical properties since some measurements require that changes be made. ...
... observe and describe matter. The same element or compound is present before and after the change. The same molecule is present throughout the changes. Physical changes are related to physical properties since some measurements require that changes be made. ...
Chemical changes
... (g) after the formula –gas H2 (g) (l) after the formula -liquid H2O(l) (aq) after the formula - dissolved in water, an aqueous solution. CaCl2 (aq) used after a product indicates a gas (same as (g)) O2 used after a product indicates a solid (same as (s)) ...
... (g) after the formula –gas H2 (g) (l) after the formula -liquid H2O(l) (aq) after the formula - dissolved in water, an aqueous solution. CaCl2 (aq) used after a product indicates a gas (same as (g)) O2 used after a product indicates a solid (same as (s)) ...
chemical reaction
... • Before a reaction can start, molecules of the reactants have to bump into each other, or collide. • The collision must be strong enough. • This means the reactants must smash into each other with a certain amount of energy. • To start any chemical reaction, a minimum amount of energy is needed. • ...
... • Before a reaction can start, molecules of the reactants have to bump into each other, or collide. • The collision must be strong enough. • This means the reactants must smash into each other with a certain amount of energy. • To start any chemical reaction, a minimum amount of energy is needed. • ...
Chemistry Essentials Unit 2
... Observed as having definite volume but not shape – will take shape of container ...
... Observed as having definite volume but not shape – will take shape of container ...
B - Basic information
... a3- Recognise oxidation reactions types, mode of action and effects. b - Intellectual skills: On successful completion of the course, the student should be able to. b1- Interpret glycogenolysis, glucogenesis and gluconeogenesis. b2- Link oxidation reaction mode of action and their effects. c - Pract ...
... a3- Recognise oxidation reactions types, mode of action and effects. b - Intellectual skills: On successful completion of the course, the student should be able to. b1- Interpret glycogenolysis, glucogenesis and gluconeogenesis. b2- Link oxidation reaction mode of action and their effects. c - Pract ...
Section 4.6: Double Displacement Reactions
... 2. (a) The reaction is a double displacement reaction. (b) The reaction is a single displacement reaction. (c) The reaction is a double displacement reaction. (d) The reaction is a single displacement reaction. 3. (a) The chemical formula for lead sulfate is PbSO4. It is slightly soluble. (b) The ch ...
... 2. (a) The reaction is a double displacement reaction. (b) The reaction is a single displacement reaction. (c) The reaction is a double displacement reaction. (d) The reaction is a single displacement reaction. 3. (a) The chemical formula for lead sulfate is PbSO4. It is slightly soluble. (b) The ch ...
5.1 Weathering
... • Exfoliation (layers of onion) • Causes the outer layers of the rock to expand more than the rock below ...
... • Exfoliation (layers of onion) • Causes the outer layers of the rock to expand more than the rock below ...
Chemical reactions cause chemical changes. They involve the
... words, chemical reaction equations must show all the same atoms in the reactants and the products. They will just be arranged in different ways to show that a chemical reaction has occurred. There are many ways atoms can be rearranged in compounds. Thus, there are many types of chemical reactions. T ...
... words, chemical reaction equations must show all the same atoms in the reactants and the products. They will just be arranged in different ways to show that a chemical reaction has occurred. There are many ways atoms can be rearranged in compounds. Thus, there are many types of chemical reactions. T ...
Role of Chemistry in Everyday Life
... through power plants which burn fuels. Petrol and diesel emit out green house gases dangerous for the survival on earth which damage the ozone layer that protects us from UV rays. As a result global warming has taken place which is a destroyer of the planet earth. But again Chemistry paves the way w ...
... through power plants which burn fuels. Petrol and diesel emit out green house gases dangerous for the survival on earth which damage the ozone layer that protects us from UV rays. As a result global warming has taken place which is a destroyer of the planet earth. But again Chemistry paves the way w ...
physical change
... Each molecule of a compound contains two or more elements that are chemically combined. ...
... Each molecule of a compound contains two or more elements that are chemically combined. ...
Chapter-1-Intro - Mister Chemistry Welcomes You!
... (slides that follow are linked to earlier ones) ...
... (slides that follow are linked to earlier ones) ...
Chemical Equations and Reactions
... 1.What are the step necessary to balance a chemical equation? ...
... 1.What are the step necessary to balance a chemical equation? ...
Chapter 8
... • List three observations that suggest that a chemical reaction has taken place. • List three requirements for a correctly written chemical equation. • Write a word equation and a formula equation for a given chemical reaction. • Balance a formula equation by inspection. ...
... • List three observations that suggest that a chemical reaction has taken place. • List three requirements for a correctly written chemical equation. • Write a word equation and a formula equation for a given chemical reaction. • Balance a formula equation by inspection. ...
Master Sheet Mole:Mole Ratios and Mass
... 3. Convert to moles (using atomic or molar masses) 4. Use the chemical equation to write a mole:mole ratio that allows you to convert from one chemical to another. This is a Magic Moment: it is the ONLY time you can go from one chemical to another! I use a DIAMOND to mark this kind of factor. 5. Con ...
... 3. Convert to moles (using atomic or molar masses) 4. Use the chemical equation to write a mole:mole ratio that allows you to convert from one chemical to another. This is a Magic Moment: it is the ONLY time you can go from one chemical to another! I use a DIAMOND to mark this kind of factor. 5. Con ...
+ H 2 (g)
... EX: Water breaks down into hydrogen and oxygen gases when heated. H2O(l) H2(g) + O2(g) ...
... EX: Water breaks down into hydrogen and oxygen gases when heated. H2O(l) H2(g) + O2(g) ...
Chapter 7. CHEMICAL REACTIONS
... If you can, you will have identified 2NO3-(aq) and 2K+(aq) as remaining identical, hence unchanged on the left and right side of the equation. They are merely “spectator ions” but can be mistaken as being part of the chemical process when referring back to the balanced general equation. If they are ...
... If you can, you will have identified 2NO3-(aq) and 2K+(aq) as remaining identical, hence unchanged on the left and right side of the equation. They are merely “spectator ions” but can be mistaken as being part of the chemical process when referring back to the balanced general equation. If they are ...
Chemistry Notes
... You can see that on the left is the Sodium part and the right has the Oxygen/Hydrogen part. The bond which binds the Hydrogen to the Oxygen is covalent. The Sodium is bonded to the HYDROXIDE part of the compound with an ionic bond. This is a very good example of how there can be different types of b ...
... You can see that on the left is the Sodium part and the right has the Oxygen/Hydrogen part. The bond which binds the Hydrogen to the Oxygen is covalent. The Sodium is bonded to the HYDROXIDE part of the compound with an ionic bond. This is a very good example of how there can be different types of b ...
Learning Activities
... avagadro’s number, one step conversion, two step conversion, hydrate, empirical formula, molecular formula, stoichiometry, mole ratio, percent yield, and theoretical yield. ...
... avagadro’s number, one step conversion, two step conversion, hydrate, empirical formula, molecular formula, stoichiometry, mole ratio, percent yield, and theoretical yield. ...
Dissociation of a Diatomic Gas
... Let us consider the following simple model for a diatomic gas: a diatomic molecule consists of a pair of point-like atoms, each of mass m, separated by a rigid rod of length a. The rigid rod corresponds to the chemical bond, which requires an energy to break. Now, at any finite temperature T , we ...
... Let us consider the following simple model for a diatomic gas: a diatomic molecule consists of a pair of point-like atoms, each of mass m, separated by a rigid rod of length a. The rigid rod corresponds to the chemical bond, which requires an energy to break. Now, at any finite temperature T , we ...
Turn in Homework to the front! 9/7 Warm Up
... 1. Explain the difference between a physical and chemical change. 2. Explain the difference between homogenous and heterogeneous mixtures. 3. What are 3 ways that a mixture can be separated? ...
... 1. Explain the difference between a physical and chemical change. 2. Explain the difference between homogenous and heterogeneous mixtures. 3. What are 3 ways that a mixture can be separated? ...
Chemical weapon
A chemical weapon (CW) is a munition that uses chemicals formulated to inflict death or harm on human beings. The Organisation for the Prohibition of Chemical Weapons (OPCW) states: The term chemical weapon may also be applied to any toxic chemical or its precursor that can cause death, injury, temporary incapacitation or sensory irritation through its chemical action. Munitions or other delivery devices designed to deliver chemical weapons, whether filled or unfilled, are also considered weapons themselves.They are classified as weapons of mass destruction (WMDs), though they are distinct from nuclear weapons, biological weapons (diseases), and radiological weapons (which use radioactive decay of elements). All may be used in warfare known by the military acronym NBC, for nuclear, biological, and chemical warfare. Weapons of mass destruction are distinct from conventional weapons, which are primarily effective due to their explosive, kinetic, or incendiary potential. Chemical weapons can be widely dispersed in gas, liquid and solid forms, and may easily afflict others than the intended targets. Nerve gas, tear gas and pepper spray are three modern examples.Lethal, unitary, chemical agents and munitions are extremely volatile and they constitute a class of hazardous chemical weapons that are now being stockpiled by many nations. (Unitary agents are effective on their own and require no mixing with other agents.) The most dangerous of these are nerve agents GA, GB, GD, and VX, and vesicant (blister) agents which are formulations of sulfur mustard such as H, HT, and HD. All are liquids at normal room temperature, but become gaseous when released. Widely used during the First World War, the effects of so-called mustard gas, phosgene gas and others caused lung searing, blindness, death and maiming.Pepper spray is of common use today. It is potentially lethal. There are no recent records of pepper spray being used in war, despite the fact that it inflicts fewer injuries and side-effects compared with impact and explosive weapons.Under the Chemical Weapons Convention (1993), there is a legally binding, world-wide ban on the production, stockpiling, and use of chemical weapons and their precursors. Notwithstanding, large stockpiles thereof continue to exist, usually justified as only a precaution against putative use by an aggressor.