3 elements of combustion - Study guides, Class notes & Summaries

Mixture with uniform density throughout and no distinguishable coponents.Answer - Homogeneous Mixture Mixture in which the components are readily distinguished.Answer - Heterogeneous Mixture A change in which the checmical composition of a substance remains the same.Answer - Physical Change A change in which the chemical bonds are broken and reformed to create a new and different substance.Answer - Chemical Change The simplest of substances and is represented by a specific letter...

FDNY COF P-98 Exam With 100% Correct Answers 2024 Latest Updated Solved Graded A+. What *COF is required* to supervise the *Fuel-oil transfer in the building from one floor to another?* - Correct Answer-*P-98 and maintain all qualifications and comply w/ requirements applicable to such certificate holder* *The P-98 COF is premise-related* 3.- The use of the word *should* refers to: - Correct Answer-*Polices, procedures and / or best practices recommended by the FDNY* 4.- The use of the wor...

Fuel-oil is generally used in buildings in stationary equipment for two purposes - Correct Answer-fuel emergency generators or to fuel equipment used to heat the building. the person supervising the Fuel-Oil Transfer in the Building from one floor to another must hold - Correct Answer-P-98 Certificate of Fitness. Certificate of Fitness holders must maintain all qualifications and comply with all requirements applicable to such certificate holders throughout the term of their certificate. Th...

elative atomic mass (Ar) : Average mass of an atom compared with one twelth of the mass of an atom of carbon 12 Electronegativity : Power of an atom to attract the pair of electrons in a covalent bond Standard enthalpy of combustion : Enthalpy change when 1 mole of a substance burns completely in oxygen under standard conditions with all reactants and products being in their standard state Standard enthalpy of formation : Enthalpy change when 1 mole of a compound is formed from it's ...

Edexcel iGCSE Chemistry, question and answer with rated solution Experiment for Diffusion? 1) HCl placed at one end of the test tube, ammonia solution at the other. 2) Where they meet, a ring of Ammonium Chloride appears. 3) The diagram shows that the ammonia is closer to the ring, showing that ammonia must have travelled faster, showing it's a lighter gas. Experiment for Dilution? 1) Put a coloured substance in a solvent e.g food colouring in water. 2) Over the time, the colour le...

Fire and Smoke Restoration Exam | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+ Technicians should not decide they will be able to restore a damaged item until they have __________ the item and communicated with the customer Correct Answer: pretest The restoration company works for the property owner, who is the primary customer. A secondary customer is the __________ __________ when the property owner is an __________ Correct Answer: insurance carrier, in...

Oil Burner License Exam Questions and Answers, Latest Updated 2024/2025 (Verified Answers) What is the best long term solution for preventing a clogged nozzle? - Answer- -Remove any underground storage tanks. -Install a quality oil filter. -Cut the suction line 10" above the tank outlet to prevent sludge. Hot water and steam valves are interchangeable. - Answer- False When in the presence of a flame, a cad cell normally reads.. - Answer- 300-1000 ohms If a pump is used to bring oil to a l...

PROPANE PRACTICE TESTS WITH COMPLETE SOLUTIONS According to the Two Permanent Openings Method one opening must commence within ____ and one must commence within ___ of the enclosure 12 inches of the top 12 inches of the bottom Room heaters shall NOT be installed in what occupancies? Health care and Residential board and care. Define a type B-W gas vent: It shall not have a listed capacity NOT LESS than that of the listed vented wall furnace to which it is connected. Listed ven...

2 © OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which reactions can be catalysed by an enzyme? A Combustion reactions B Electrolysis of metal ores C Reactions in biological systems D Reactions of metals with acids Your answer [1] 2 Which row correctly describes the Group 0 elements? Physical state at 25°C Reactivity A gas very reactive B gas very unreactive C liquid very reactive D liquid...

Massachusetts oil burner study guide with complete solutions What is the voltage found at the TT terminals - Correct Answer ️️ -24 volts What are the 8 steps of a no heat call - Correct Answer ️️ -1 talk to customer 2 check tt.3 check to make sure an emergency switch is on 4check to make sure there is oil in the tank 5 check to make sure the main power going to the unit is on six check to make sure that tank shut off valve is open 7 know whether the tank is located above or below ...