Jarriette kenn D Patenio Jaymar patana Job madronal Do all ideal gases have the same molar volume? An ideal gas has the following equation of state (an equation which relates various thermodynamic properties for a substance‚ such as pressure‚ temperature and molar volume): Pv = RT P - pressure v - molar volume R - universal gas constant T - absolute temperature Clearly the molar volume depends on temperature and pressure‚ so if two gases are at different conditions then they
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Neurotransmitters are chemicals that transmit signals across a synapse‚ a structure that permits to pass electrical or chemical signal to another cell from one neuron to another. Neurotransmitters are synthesized from converting substances that are readily available to the body such as amino acids‚ which are available from food and only need some converting into transmitters. Neurotransmitters crucial to daily life and functions. Scientists are uncertain exactly how many Neurotransmitters there are
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Research The Chemical name for Baking Soda: Baking soda is sodium bicarbonate. The molecular formula of sodium bicarbonate is NaHCO3. What Baking Powder contains: Baking powder is a raising agent that is commonly used in cake-making. It is made from an alkali- bicarbonate of soda‚ and an acid- cream of tartar‚ plus a filler like corn flour or rice flour which absorbs moisture. Baking powder is a mixture of leavening agents (baking soda‚ acid salts) and inert ingredients (cornstarch‚ calcium
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Pre Lab Questions 1. What are the basic units of length‚ mass‚ volume‚ and temperature in the SI system? Length= meters (m) Volume= kilograms (kg) Temperature= Kelvin (K) 2. What decimal power do the following abbreviations represent: a) M=10^6 b) K=10^3 c) M=10 ^-3 d) N=10^-9 e) µ=10^-6 3. What is the number of significant figures in each of the following measured quantities? a) 351 g 3 b) 0.0100 mL 4 c) 1.010 mL 4 d) 3.72 x 10^-3 cm 3 4. What is the length of a crystal
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EXPERIMENT 4B: THE MENDELEEV LAB OF 1869 Materials: 30 element cards‚ periodic table Aim: How can we identify elements based on their propeties? Background: Russian chemist Dmitri Mendeleev is generally credited as being the first chemist to observe patterns emerge when the elements are arranged according to their properties. Mendeleev’s arrangement of the elements was unique because he left blank spaces for elements that he claimed were undiscovered as of 1869. Mendeleev was so confident
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1. Energetics si ygrene neht srucco egnahc yplahtne na fI dna )rH In an exothermic change energy is transferred from the system (chemicals) to the surroundings. The products have less energy than the reactants In an endothermic change‚ energy is transferred from the surroundings to the system (chemicals). The products have more energy than the reactants Enthalpy changes are normally quoted at standard conditions. Standard conditions are : • 1 atm pressure • 298 K (room temperature or 25oC) • Solutions
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number of significant figures) in milliliters of a piece of this substance with a mass of 7.73 g? 31.46 mL 1.90 × 100 mL 0.526 mL 1.26 × 102 mL 7 - After performing a calculation‚ Maria’s calculator displayed the result as 15.25927. If the answer can have only four significant figures and must be expressed using scientific notation‚ it should be reported as: 15.26 15.26 × 100 1.526 × 10 152.6 × 10-1 8 - A quantity of 5.44 mg of a substance can be expressed in scientific notation as:
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Name Class For Edexcel GCSE Mathematics Paper 1B (Non-Calculator) Foundation Tier Time : 1 hour 45 minutes Total Marks You must have: Ruler‚ protractor‚ compasses‚ pen‚ pencil‚ eraser. Instructions and Information • • • • • • Write your name in the box at the top of the page. Answer all the questions in the spaces provided. The total mark for this paper is 100. The marks for each question are shown in brackets. Calculators must not be used. Questions labelled with
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Name: |Date:| Exp 10: Caloric Content of Food|| Your Data: |First Item|Second Item|Third Item| What Food are you using|||| |||| Mass of empty beaker|||| Mass of beaker and water|||| Net Mass of the water|||| |||| Initial mass of food and holder|||| Final mass of burnt food and holder|||| Net Mass of the burnt food|||| |||| Initial temp of the water|||| Final temp of the water|||| ∆ T in C (change in temperature)|||| Calculations: Show your numbers in the following calculation
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Temperature‚ T (°C) RESULT Preassure‚ P (bar) | | | | | | Measure slope‚ dT/dP | Calculated slope‚Tvg/hfg | Gauge | Absolute | Increase (°C) | Decrease(°C) | AverageTavg (°C) | AverageTavg (K) | | | 0.1 | 1.1 | 104.0 | 106.6 | 105.30 | 378.45 | - | 0.260 | 0.2 | 1.2 | 107.3 | 109.3 | 108.30 | 381.45 | 0.3 | 0.243 | 0.3 | 1.3 | 109.8 | 111.8 | 110.80 | 383.95 | 0.25 | 0.227 | 0.4 | 1.4 | 112.0 | 113.9 | 112.95 | 386.10 | 0.22 | 0.213 | 0.5 | 1.5 | 114.3 | 115.9 | 115.10
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