Why is pure water - Study guides, Class notes & Summaries

In the nitrogen cycle, which of the following steps involves removal of nitrogen from the atmosphere by bacteria? Nitrogen Fixation If enough H+ ions are added to pure water to raise the H+ concentration of the solution to ten times higher than the original concentration, what is the resulting OH- concentration of the solution? 10-8 M Fungi are able to reproduce asexually by creating conidiospores and sporangiospores. Which of the following is an accurate explanation for why it is advantag...

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...

PTCB EXAM TEST BANK QUESTIONS AND ANSWERS LATEST WITH RATIONALE Multiple choice What is the route of administration for a prescription with the following directions: "i supp pr q 6 hr prn"? A. Orally B. Rectally C. Urethrally D. Vaginall {{Correct Ans- B. Rectally Rationale: "pr" means per rectum. What is the meaning of PDA? A. Personal digital aid B. Personal digital assistant C. Physician digital assistant D. Pharmaceutical data assistant {{Correct Ans- B. Personal dig...

ATSC 110 Test 1 Questions with All Correct Answers What is kinetic energy? - Answer- Anybody in motion has kinetic energy, therefore kinetic energy is the energy within a body that is a result of its motion. How does the average speed of air molecules relate to the air temperature? - Answer- Temperature is a measure of the average speed of the atoms and molecules, where higher temperatures correspond to faster average speeds of atoms and molecules. Distinguish between temperature and h...

Praxis 5442 Middle School Practice Questions with Complete Solutions A book is at rest on a tabletop. A teacher asks students to sketch the forces exerted on the book. Which of the following student diagrams best depicts all the forces exerted on the book? For an object at rest, forces must be balanced. The student diagram correctly depicts the balanced forces acting on the book, the force of gravity directed downward, and the force exerted by the table directed upward. A certain spec...

GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Version: 1.0 Final *JUN238464C2H01* IB/M/Jun23/E7 8464/C/2H For Examiner’s Use Question Mark 1 2 3 4 5 6 TOTAL Tuesday 13 June 2023 Morning Time allowed: 1 hour 15 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at t...

”1. Compare and contrast diffusion and osmosis.” Diffusion occurs when molecules move from a higher concentration to a lower concentration until a stable state is established. The molecules are free to circulate until they reach a state of equilibrium. While in Osmosis, molecule movement isn't always free but rather selective due to the presence of a semipermeable membrane that allows only the most effective solvent molecules to pass through. ”2. What is the water potential of an op...

Behavioral Cues of Intoxication - Correct Answer-inhibitions impaired judgement slowed reactions loss of coordination inhibitions - Correct Answer-relaxed and talkative + could display mood swings. Judegement - Correct Answer-overly friendly, dancing or singing reactions - Correct Answer-thinking process has been affected. glassy/unfocused eyes. slurred speech . lost their train of thought coordination - Correct Answer-spill drinks, stumble, stagger. may have a difficult time handling t...

In what ways are microorganisms important to humans? correct answers They're important in fermentation reactions, they produce biofuel Studying microorganisms help with vaccination and antibiotic therapy We use microorganisms to purify our water Used in pasteurization so that food is safe to eat What is a bacterial colony and how is one formed? correct answers A colony forms by placing a single microbial cell on a solid nutrient medium where it can grow and divide into millions of cells. ...

Explain the significance of the hydrogen bond correct answers •Similar to ionic bond but weak •Polarity causes water molecules to form weak (hydrogen) bonds between water molecules •Although the hydrogen bond between molecules is only 5% as strong as the bonds between hydrogen and oxygen (covalent bonds), it accounts for many of water's important properties •The way we see water today is almost a gel because of the hydrogen bonds Special properties of water (hydrogen bond is behin...