Exothermic reactions - Study guides, Revision notes & Summaries

To be isotopes, two atoms of the same element must have a different number of (A) neutrons. (B) protons. (C) electrons. (D) quarks. - Answer-(A) neutrons. Depending on its environment, a substance that can act as either an acid or a base is described as (A) amphoteric. (B) an isomer. (C) hydrolytic. (D) a polymer. - Answer-(A) amphoteric. A certain substance is not broken down in a chemical reaction. The substance is most likely (A) a compound. (B) an aqueous solution. (C) an ele...

AQA GCSE Chemistry - Paper 2 Questions And Answers 100% Verified. Mean rate of reaction (with reactant) - correct answer. Rate of reaction: Quantity of reactant used ---------------------------- Time taken Mean rate of reaction (with product) - correct answer. Rate of reaction: Quantity of product formed ---------------------------- Time taken Measurements for quantity of product or reactant - correct answer. Either as mass in g or as volume in cm³ Measureme...

Thermochemistry Ans: the study of the amount of heat absorbed or released during a chemical of physical reaction Energy Ans: the capacity to do work - causing matter to move against an opposing force Potential energy Ans: the energy of an object has based on its relative position, composition, condition Kinetic energy Ans: the energy an object possesses due to its motion What are chemical reactions and what forms of energy are associated with chemical reactions? Ans: substance conv...

CEM 142 EXAM 2 LATEST UPDATE GRADED A+ **ACID = ELECTRON PAIR ACCEPTOR Acid= electrophile **BASE = ELECTRON PAIR DONOR base= nucleophile strong acid fully ionizes in solution/completely dissociates weak acid does not fully ionize or dissociate into ions ** negatively charged ion ---> wants to loose 1 electron can tell if a solution is ionized when... a fully ionized solution will conduct more electricity than a non fully ionized solution strength of acid depend...

oxidation-reduction (redox) reactions ~ a reaction that involves the transfer of electrons between reactants, many involve the reaction of a substance with oxygen oxidation ~ loss of electrons reduction ~ gain of electrons OIL RIG ~ oxidation is loss, reduction is gain redox reactions are those in which the following occurs: ~ -a substance reacts with elemental oxygen -a metal reacts with a nonmetal -one substance transfers electrons to another substance combustion reactions...

A __________ ΔH corresponds to an __________ process. -zero, endothermic -positive, exothermic -negative, endothermic -zero, exothermic -positive, endothermic correct answer: positive, endothermic Which one of the following is NOT considered a fossil fuel? -natural gas -hydrogen -anthracite coal -petroleum -crude oil correct answer: hydrogen Which one of the following statements is FALSE? -The enthalpy change for a reaction is equal in magnitude, but opposite i...

Exam 1- FNDH 620 The organelle that serves as the digestive system in the cell is A. polysome B. endosome c. Lysosome d. ribosome e. intestine - Lysosome Peripheral proteins function primarily as ion channels and active transports True or false - False What is cell signaling? A. The process a cell goes through before it becomes functional B. Nerve impulses that cause motion C. Biochemical reactions that convey a message to a DNA promoter D. The process of protein catabolism - ...

Pearson Edexcel Level 1/LeveI 2 GCSE (9-1) Time 1 hour 10 minutes Paper ISCO/2CF Reference combined science PAPER 5 Foundation Tier Please check the examination details below before entering your candidate information Centre Number Candidate Number Pearson Edexcel Level 1/Level 2 GCSE (9–1) Time 1 hour 10 minutes Paper reference 1SC0/2CF Total Marks Candidate surname Other names You must have: Calculator, ruler • • Answer all questions. • Calculators may be used. •...

condensation of rain from water vapor - Answer melting ice cubes Melting ice cubes are an example of an endothermic process, because heat energy is taken from the surroundings when ice cubes melt. Burning sugar and a candle burning are both chemical reactions which give off heat energy, so they are both exothermic. When water vapor condenses, more energetic gas molecules become less energetic liquid molecules; the heat energy from the more energetic molecules in the gas phase is given off ...

Fire Academy Week 2 Tests Which of the following best describes how understanding the physical science of fire can help firefighters? A. It keeps radiant heat from igniting fuel B. It keeps flaming combustion from beginning C. It translates into practical knowledge of fire behavior D. It helps in stopping rapid fire behavior from developing - C When a substance changes from one type of matter to another it has had a: A. Chemical shift B. Physical change C. Chemical reaction D. Phy...