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States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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- Directions: Determine the factor affecting the rate of reaction in the following statements. Write 1 for -concentration, 2 – for temperature, 3 - for surface area, and 4- for catalyst. 1. False denture cleaner tablet dissolves faster in water when in powdered form. 2. Bubbles were produced at faster rate in the test tube with hydrogen peroxide mix with manganese dioxide. 3. Japanese/crepe paper changes color with higher bleach solution. 4. Moderna vaccines require -70 to -80 degrees Celsius to maintain its efficacy rate. 5. Fever suspension medicines mix well with warm water. 6. More foamy substance is released when 3:1 mixture of baking soda and vinegar is made. 7. 20% HCI solution reacts faster when mixed with crushed than uncrushed egg shells. 8. Aluminum foil reacts with 30% muriatic acid diffusing gas all over the lab room. 9. Ozone depletes at a higher rate when sulfates are mixed with it. 10. Danger of explosion in places like coal mines is high because there are large qu ntids…AutoSave O Off CHE124 ORG TUT4 2021 - Protected View - Saved to this PC - O Search Siphokuhle Njoko SN File Draw Design References Mailings Review View Help A Share P Comments Home Insert Layout i) PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing 1. For each of the following pairs of Sy2 reactions, indicate which reaction occurs faster: a) CH;CH2BR + H20 OR CH:CH>Br + OH- b) Remember the following is under an SN2 condition: CH; CHCH,Br ČH3 + OH CH,CH2CHBR + OH" OR CH3 2. What is the product of the reaction of ethyl bromide with each of the following nucleophiles? a) CH;CH2CH20- b) CH;C=C c) (CH3)sN 3. Arrange the following alky halides in order of decreasing reactivity in an SN1 reaction: a) 2-bromopentane, 2-chloropentane, 1-chloropentane, 3-bromo-3-methylpentane Page 1 of 2 160 words D Focus 110% 23:54 P Type here to search L 74% 17°C O 4) ENG 2021/10/27Reversible reactions Directions: Open the link (http://phet.colorado.edu/en/simulation/reversible-reactions) to internet browser to play the simulation of reversible reactions. Allow flash player to your internet browser. The simulation can also be played offline. Open the .jar file that has the file name "reversible reactions". If computer or laptop is not available. Please refer to the images shown to answer the questions. Initial Two gas molecules in motion in the left chamber. Divider removed. Prediction Figure 2. Expansion of a Gas with Two Molecules. Set-up the simulation so that two gas molecules are in motion in one chamber, with the other chamber empty shown in figure 2. Q5. Predict what happens when the divider is removed. Q6. Describe the particle motion.
- Catalyst is described as any substance that increases the rate of a reaction without itself being consumed. Give a modern and recent application of a catalyst used in a chemical reaction. a ) the commercial or trade name of the catalyst b ) the properties of the catalyst (e.g., shape, size, colour, price). c ) the advantages and the disadvantages of the chosen catalyst. d )catalytic reaction (e.g., the reactant, product, reaction equation, phase, selectivity, promoter, catalyst support, operating temperature & pressure).KINETICS AND EQUILIBRIUM Calculating average and instantaneous reaction rate from a... Hanı Here is a graph of the molarity of hydrogen peroxide (H,0,) in a reaction vessel during a certain chemical reaction. Use this graph to answer the questions in the table below. 0.03 0.025 0.0224 0.02- 0.0170 M 0.015 0.01 0.00875 0.005 10.0 15 20.6 25 30 Lン seconds created ロロ x10 Is H,0, being created or destroyed by the chemical destroyed 2. reaction? neither created nor destroyed Explanation Check 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy | Accessibility PRED-1200-007(Spring 2021) 601 tv 20 MaćBook Air DD 000 F9 F10 F8Directions: Using all resources available to you, investigate the chemical procedure known as the Ostwald Process and answer the following questions fully: a) What is the core chemical equilibrium (or equilibria) associated with this process? Write the balanced chemical equation(s). b) Write the expression for the equilibrium constant of this reaction. c) Draw and label a general diagram of the process. See the final slide of Chapter 13 illustrating the Haber-Bosch Process as an example. Provide details such as temperature, pressure, presence and identity of a catalyst, etc. d) What elements of this process utilize Le Chatelier's Principle to improve production of the desired product? e) Are there elements that do not utilize Le Chatelier's Principle but still aid in creating the product?
- Equilibrium and Reversible Reactions Part A. Name: PhET Equilibrium Inquiry Activity Learning Goals 1) Visualize a system at dynamic equilibrium state (DES) 2) Characterize the DES by finding the red: green ball ratio, Krg. 3) Design an investigation to test the effect of changing temperature, number of balls and activation energy barrier has on the Part 1: Play Instructions: 1) Open the PhET "Reversible Reactions" simulation. (https://phet.colorado.edu/en/simulation/legacy/reversible-reactions) 2) Play with the simulation. Click on EVERYTHING! 3) Answer the following questions: I 1) Put some number of balls (>50) in one of the wells. In a table, record the number of green and red balls in each well as a function of time. (Suggested time length: 5 minutes, suggested intervals: 15-20 seconds) Paste the table into this document. (Google spreadsheet will work well for this.) 2) Paste in a graph of your data. Describe the shape of the graph and what it means in terms of the red and green…Chemistry Melting Points A Homework Unanswered Arrange the following compounds from highest to lowest melting point (lowest melting point at the bottom): Drag and drop options into correct order and submit. For keyboard navigation... SHOW MORE Cao CaTe CaSe Cas Reaction Rate Homework Answered If the following chemical reactions have the same activation energy, which of them is likely to be faster at a given temperature? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a A(g) + B(g) → AB(g) X 2A(g) + B(g) → A₂B(g) Your answer AB(g) + C(g) → ABC(g) d All will proceed at a similar rate Revent Answered-Incorrect 1 attempt left b C ||| M ||| III E E IIISketch a qualitative reaction energy diagram for a chemical reaction with and without a catalyst. Assume the uncatalyzed reaction is endothermic. Note: Because the sketches are only qualitative, the energies in them don't have to be exact. They only have to have the right relationship to each other. For example, if one energy is less than another, that fact should be clear in your sketch.
- Activity 4: TANGLED CATALYSTS PROCESS Directions: The diagrams and statements below show how a catalyst speeds up this reaction but they are in the wrong order. Cut them out, then match up the statements to the diagrams so they describe what is happening. Then, stick them down in the correct order. Use arrows to indicate the sequence and a separate sheet for your output. Molecules of reactant A form bonds The product leaves the surface of the catalyst. with the active sites on the catalyst. The bonds in between the atoms of the molecule start to break. Molecules of reactant A come close to active sites on surface of the catalyst. Molecules of reactant B align itself alongside reactant A. 33 AM 1/2021 e to se Bonds between the atoms in reactant B start to break as new ones are formed between the atoms of reactant A and B. active sites De in ckstopic: chemical kineteics is it true that a reaction that occurs quickly must be an irreversible reaction? why or why not?Lab 6: Chemical Reactions Post-Lab Questions Station V: Heating Cu with Atmospheric O₂ Chemical equation: Complete ionic equation: Net ionic equation: General reaction type: Station VI: Reacting CuSO4 Solution with Steel Wool (Fe)