Which gas is br - Study guides, Class notes & Summaries

General Chemistry placement test Study Guide Latest Update Rated A+ molecule two nonmetal atoms combined form a covalent compound called a diatomic molecules H2,O2,F2 Matter Anything that has mass and takes up space Element A substance that cannot be broken down into simpler substances Compound A pure substance made of two or more elements CHEMICALLY combined. Compound Can be decomposed by chemically Mixture A PHYSICAL blend of two or more components (aq) aqueous mixtu...

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...

TMC - Mechanical Ventilation C. - During a routine ventilator parameter check on a patient, you notice the low pressure alarm is being briefly activated prior to each breath. Which of the following is most likely the cause? A. the patient is fighting the ventilator B. the flow rate is set too fast C. the alarm delay is set too short D. the peak pressure limit is set too high C. - A 52-year-old, 5' 9" tall male patient weighing 85 kg (187 lb) is being mechanically ventilated. An ar...

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...

Question 1 Correct 4.00 points out of 4.00 The SI base unit of mass is Select one: A. g. B. metric ton. C. mg. D. lb. E. kg. Question 2 Correct 4.00 points out of 4.00 The boiling point for liquid nitrogen is 77 K. What is the temperature in degrees Fahrenheit? Select one: A. –289°F B. –321°F C. –127°F D. 662°F E. 177°F Straighterline CHEM101 General Chemistry I Midterm Exam (New Version June 2024) We are a team of experts offering class attendance for all Stra...

SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024 Answer: Oxygen Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Elem...

A spontaneously breathing 76-year-old patient who weighs 60 kg (132 lb) is on an FIO2 of 0.45 via a trach collar. He has had a change in his tidal volume from 600 mL to 300 mL and his respiratory rate went from 12 /min to 24 /min. Which of the following changed due to the change in the tidal volume and rate? A.Minute ventilation B.Alveolar ventilation C.Anatomical deadspace D.Mechanical deadspace - ANS B Which of the following would be most helpful in determining if a patient is...

M1 FINAL COACHING EXAM - Questions and Answers (Complete Solutions) Which of the following represents the index of the protective power of colloids? A. Nuggets B. Lumina C. Poise D. Zsigmondy What is formed when an atom or cation acts as the center about which anions or molecules arrange themselves? A. Covalent compounds B. Ionic compounds C. Complexes D. Ionic-covalent compounds What does enthalpy refer to in thermodynamics? A. Latent heat B. Heat content C. Degree of total molecular D. Heat ...

2 © OCR 2023 1 The diagram shows part of Mendeleev’s Periodic Table. B 11 C 12 N 14 O 16 F 19 Al 27 Si 28 P 31 S 32 Cl 35.5 As 75 Se 79 Br 80 In 115 Sn 119 Sb 122 Te 128 I 127 (a) Give the symbols of the two elements shown in the diagram which are not in order of atomic mass. ........................................................... and ........................................................... [1] (b) Mendeleev left gaps for elements that had not ...

Types of Electrolytes: correct answer: -strong: SOLUBLE & IONIC -weak: SOLUBLE & MOLECULAR -non-electrolytes: INSOLUBLE Solubility Rules correct answer: 1. Group 1A Metals (Li+, Na+, K+, etc.) 2. Ammonium (NH4+) 3. Nitrate (NO3-) 4. Acetate (C2H3O2-) or (CH3COO-) 5. Hydrogren Carbonate (HCO3-) 6. Chlorate (ClO3-) 7. Perchlorate (ClO4-) 8. Halogens (Cl-, Br-, I-) EXCEPT W/ (Ag+, Pb2+, Hg2^2+) 9. Sulfate (SO4^2-) EXCEPT W/ (Ag+, Pb2+, Ca2+, Sr2+, Ba2+) Insolubility Rules correct ...