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States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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- Which of the statements given below is correct? A. Iodometry is a method in which 12 solution is used as a titrant and the substances that can reduce iodine to iodine can be determined. B. Starch indicator is added to the medium at the beginning of the titration. C. All metal salts other than alkali salts dissolved in water cause hardness properties. D. 1 German hardness is the hardness of water containing cation equivalent to 1 mg CaCO3 per 100 mL.15. These are samples of about the same size that are carried through an analysis in exactly the same way.A. TitrateB. AnalyteC. ReplicatesD. Distillate1. In this method, the mass of the analyte or a compound derived from the analyte is determined. 2. Spectroscopic methods of analyses measure the interaction between, analyte atoms, molecules, or emission of radiation by analytes. 3. and samples are materials where its constituent parts can be distinguished visually or with the aid of a microscope. 4. These types of samples must be contained in closed containers to avoid its evaporation and change in concentration. 5. The indicated name. is a process of determining how much a given sample is the material by its 6. The components in a sample aside from the analyte that affects the final measurement are called 7. Techniques or reactions that apply to a few analytes are said to be usually requires a large investment of time 8. An analytical method with high and money. 9. This is a process of collecting a small mass of a material whose composition accurately represent the population. 10. The ultimate objective in a chemical analysis is to…
- 2. Formaldehyde. Qualitative and quantitative analysis.Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 42. Primary Standard reagent used in standardization of 0.1N sodium hydroxide a. Sulfamic acid C. sodium carbonate KHP b. sodium bicarbonate d. 43.An analyst who determines the strength, potency and percentage purity of a drug or pharmaceutical product is performing: a. Special method C. d. Pharmaceutical assaying Identification test b. Pharmacopoeial test 44.Chemical analysis which determines the amount or percentage content of a certain component in a sample: a. Qualitative C. d. Proximate Ultimate Quantitative ܩ b.Answer in not more than 5 sentences per question 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced? Give 2 examples of substances used as desiccants.
- Which of the statements given below is correct? A. Iodometry is a method in which I2 solution is used as a titrant and substances that can reduce iodine to iodine can be determined. B. Starch indicator is added to the medium at the beginning of the titration. A. All metal salts other than alkali salts dissolved in water cause hardness. D. 1 German hardness is the hardness of water containing cation equivalent to 1 mg CaCO3 in 100 mL.The two salts NaNO3 and K2SO4 are dissolved in the same water sample to create a solution. The water is then allowed to evaporate over several days. How many possible salts could be observed and recovered from the residue after the water has completely evaporated?Choose the number of salts and which salts could be observed?A. 2, NaNO3 and K2SO4B. 2, KNO3 and Na2SO4C. 4, NaNO3, K2SO4, K2NO3, NaSO4D. 4, NaNO3, K2SO4, Na2SO4, KNO321. In a cleaning mixture based on a mixture of water and oil, an additional ingredient is needed to unite it, which is called .... A. emullientB. emulsifierC. preservativesD. suspending agent 22. The side effects of using shampoo in hair damage can be overcome by…. A. reduce shampoo contact time with hairB. all answers are correctC. Dilute the shampoo with water before useD. pH of shampoo is made neutral
- To which sample solution the spike will be add? the distillate>130C the mass standard the distilled <130CMatch the following terms to their definitions: Aqueous solution, cation, centrifuge, decant, flame test, precipitate, qualitative analysis, supernate the systematic separation and identification of the chemical components in an unknown sample is known as ...? Group of answer choices Centrifuge Decant Supernate Flame Test Aqueous Solution Precipitate Qualitative Analysis Cation1. What is the precipitate formed from the reaction of permanent hard water with sodium carbonate? Write the balanced chemical reaction involved. 2. Compare the results obtained when soap solution was added to the soft and hard water. Soft Hard Relative amount of bubbles Relative amount of precipitates