Answers created by Dave

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• Is adding sugar to lemonade a physical or chemical change?
  
• How many half-lives will it take to reach 6.25% of its original concentration?
  
• What is the molecule on which an enzyme acts called?
  
• How many Protons And Neutrons in these isotopes?
  
• How do strong acid solutions conduct electricity?
  
• Is Oleic acid organic or inorganic? Polar or nonpolar? Covalent or Ionic?
  
• Doubts in stoichiometry/mole concept?
  
• How do lipids store energy?
  
• How is ATP related to phosphorylation?
  
• An "empty" container is not really empty if it contains air. How may moles of nitrogen are in an "empty" two-liter cola bottle at atmospheric pressure and room temperature (25∘C)? Assume ideal behavior.
  
• If 1 oxygen atom fuses with 2 hydrogen atoms (not bonding!), would they create neon? Is this how neon is made inside stars?
  
• How does a restriction enzyme limit or restrict the effect of a virus on a bacterial cell?
  
• The total number of electrons in orbitals with ml = 0 for Sr? a) 2 b) 10 c) 12 d) 18 e) 34
  
• What is the difference between electronic and molecular geometries?
  
• What is a nuclide?
  
• Amino acids as monomers of protein?
  
• 18g glucose is dissolved in 180g of water. The relative lowering of vapour pressure is ? a)1 b)1.8 c)0.01 d)0.001
  
• So long as the conical flask is clean why does it not matter if it is wet prior to addition of the 𐑃-ascorbic acid solution? 1. it does matter, it is essential to the experiment that all equipment is clean and dry before use 2. because water does not t
  
• How does transcription differ from dna replication?
  
• The red light of a He-Ne laser has a wavelength of about 633nm. What is its frequency?
  
• 6.3 gm of conc nitric acid is diluted by adding 68 gm of pure water. How many oxygen molecules are present in the solution?
  
• Determine the pH of each of the following solutions. Part A:0.14 M NaC2H3O2 Part B: 0.12 M NaCl How would I solve for the pH? Do I use an ICE table?
  
• Why do we not use the amount of excess reagent to predict the amount of product formed in a reaction?
  
• Why is the ideal gas constant important?
  
• Describe the composition of human haemoglobin, and explain how haemoglobin supports oxygen transport in the blood, using a diagram of the haemoglobin dissociation curve. 5 marks?
  
• Chemistry question about solubility products and #K_(sp)#?
  
• A DNA strand has the sequence GTTCCAGAG. Which is the complementary strand of RNA?
  
• Where does GFP come from? How does it help researchers know if a gene is active?
  
• If the Km of the substrate is equal to the dissociation constant of the substrate Kd, and Ki is greater than Km, which binds more tightly, the inhibitor or the substrate?
  
• Why you have to do a titration at least twice or more?
  
• What is a biological function of restriction enzyme?
  
• What is the role of lysis solution and heating the onion cell in waterbath for DNA extraction?
  
• How does vapor pressure relate to intermolecular forces?
  
• For a given chemical reaction, the addition of a catalyst provides a different reaction pathway that does what?
  
• What SI units are used to measure volume?
  
• Why is it impossible to know precisely the velocity and position of an electron at the same time?
  
• What are the similarities exist between the fossil fuel molecules and the food molecules?
  
• What is the partial pressure?
  
• Based on Le Chatelier's principle, what is the predicted effect on the solubility of calcium chloride?
  
• Why would frameshift mutation have a larger impact than a substitution mutation on the organism in which the mutation occurred?
  
• Which species has the highest ionization energy? Mg, Mg+, Mg2+, Al+, Al2+
  
• How does specific heat of a heated object affect temperature change when placed in water?
  
• Why neutralization of acetic acid does not occur with sodium hydroxide in presence of hydrochloric acid?
  
• How memory is stored in brain?
  
• Which of the following would be a polar molecule? Why?
  
• What are the connections between the processes of photosynthesis and combustion?
  
• Which are shorter and stronger bond,covalent or hydrogen ?
  
• Why don't antibiotics work on viruses?
  
• Are binary molecular compounds generally composed of a metal and a nonmetal?
  
• How many grams to prepare a buffer?
  
• What is oxygen's role in the electron transport chain?
  
• How to determine the n,l, and ml for cr,fe and Mg?
  
• As some aminoacids have more than one codon so for production of an aminoacids all of its codons are necessary or any one of them can encode individually for that aminoacid?
  
• The activation energy of the reaction, A+B----> C+D+ 38kcal is 20kcal. What would be the activation energy of the reaction, C+D -----> A+B?
  
• How do I find the subatomic particles from these isotopes? Zn-32, Sn^+4, and Al. Thank you
  
• What is the main idea behind VSEPR?
  
• Does CH3CH2CH2CH2CH2CH3 or (CH3)3CCH2CH3 have stronger intermolecular forces?
  
• Why are amides more resistant to hydrolysis than esters?
  
• Why do bacterial transformations fail at times?
  
• Answer the following questions by referring to the equation below:?
  
• How do proteins differ from polypeptides?
  
• What are some examples of the following types of chemical reactions? (Creative things that I can draw.. please no chemical formulas.) -Synthesis reaction -Decomposition reaction -Double-replacement reaction -Single-replacement reaction
  
• How to convert 300 mL/hr to ML/min?
  
• Without drawing a Lewis structure, do you think that CO contains a single, double, or triple bond?
  
• What is the atomic number, atomic mass, and number of neutrons of carbon?
  
• Do dipole-dipole interactions influence the evaporation of liquids and condensation of gases?
  
• For the reaction 2NaI + Cl2 →2NaCl + I2 How many grams of NaCl is obtained if 5.0 grams of NaI reacts with 5.0 grams of Cl2?
  
• What is a bond created between atoms where they share their outer electrons to become stable?
  
• How many moles of hydrogen, H2, are needed to react with 175 moles of nitrogen gas in the reaction forming ammonia?
  
• Why are enantiomers important to the pharmaceutical industry?
  
• Considering the following, which state or states is the substance after this time?
  
• If half of a radioactive sample decays after 1 day, will the other half decay after 1 additional day? Why or why not?
  
• How do endothermic processes affect cooking an egg?
  
• Calculating wavelength help?
  
• Describe the role of the ribosome in translation?
  
• I am thinking of a molecule that has a polar head group, two fatty acid tails, and is amphipathic. Of what kind of molecule am l thinking?
  
• What is redox reaction?
  
• Describe the role of ribosomes in protein synthesis?
  
• Ionization Energy?
  
• What is the stationary phase in gas chromatography?
  
• How is carbon-14 used in radiocarbon dating?
  
• The energy in food is locked up within its? A)nutrients B)chemical bonds C)chloroplasts D)mitochondria
  
• Concentrations of acids and bases?
  
• What is formed when calcium chloride and sodium carbonate are mixed?
  
• How many moles of hydrogen gas are contained in 21.3 L at stp?
  
• how does a genotype influence phenotype?
  
• Ionization help, please?
  
• Which of the following is the buffer solution of strong acidic nature?
  
• Which of the two #O_2NCH_2CH_2O# or #CH_3CH_2O^-# is expected to be more stable and why?
  
• ) Explain the purpose of washing the sand with hot water. Why was it important to wash the sand with hot water? How would the experimental results be affected by washing the sand with cold water instead of hot water?
  
• What is meant by half life of a radioactive element is 30 seconds calculate the deccay constant?
  
• If one side of a DNA molecule reads ATGCCGT, what would the complementary side read?
  
• Is sugar a carbohydrate? Why?
  
• Can we recover bromine from sodium bromide (aq)+sodium acetate (aq) mixture?
  
• I need help with this Chemistry problem, how do I do this?
  
• How many DNA strands exist at the completion of semi conservative replication?
  
• A sample of nitrogen gas at a pressure of 3 atm inside a rigid, metal container at 20.0 °C is placed inside an oven whose temperature is 50.0 °C. What is the pressure of the nitrogen after its temperature is increased? Answer atm
  
• Explain why AsF5 does not follow the octet rule? How/why are there exceptions to the octet rule?
  
• What is the pH at 25 degrees Celsius of a 0.0064 M solution of a weak base with a Kb of 1.6E-9?
  
• How do we come to know which aldehyde is stronger reducing agent? methanal,ethanal,propanal,butanal
  
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