Answers edited by Denise Granger

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• What is the equation of the line that goes through #(5, -6)# and is perpendicular to #y=9#?
  
• What are the five characteristics of a base?
  
• Question #67926
  
• How do you write/draw a Lewis structure for #N#?
  
• I have conducted a calorimetry experiment on the latent fusion heat of ice. Even when the procedure is followed throughly, I keep getting a value that is far off from the actual value. And this continues even after the experiment is repeated, why?
  
• Why is the respiration reaction exothermic?
  
• What are valence electrons?
  
• Why is the Hardy-Weinberg equation important?
  
• How do valence electrons affect bonding?
  
• How can I balance this chemical equations? Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas.
  
• What is the oxidation number of hydrogen in H2 ??
  
• How is thermochemistry used in my freezer?
  
• What is the balanced equation for photosynthesis?
  
• How do you solve #100x^2 = 25#?
  
• Question #d2fe3
  
• Question #3c657
  
• How do you write the formula of zinc oxide?
  
• 4790 joules of heat are added to 222 grams of water originally at 27.7 C. What is the final temperature of the water?
  
• Question #3b334
  
• Question #f5126
  
• What does the R stand for in the ideal gas law (PV=nRT)?
  
• Question #717bc
  
• What is the correct name for #N_2O_5#?
  
• What are the main differences in alpha decay and beta decay?
  
• How do you calculate the following to the correct number of significant figures?
  
• What is a thylakoid?
  
• How do you simplify #-5v -5(-8 -6v)#?
  
• What do protons determine about an element?
  
• What does polar mean in chemistry?
  
• Question #02190
  
• Question #1fa7a
  
• Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. The balanced equation to this is #CaH_2+2H_2O#----#Ca(OH)_2+2H_2# How many grams of calcium hydride are needed to form 8.400 g of hydrogen?
  
• How do you give the six trigonometric function values of 5pi/3?
  
• The sodium-potassium pump is important in what cell function?
  
• Question #a04c1
  
• The empirical formula for #CO_3# was found to have a molar mass of 120 g/mol. What is the molecular formula?
  
• The compound adrenaline contains 56.79% carbon, 6.56% hydrogen, 28.3% oxygen, and 8.28% nitrogen by mass, what is its empirical formula?
  
• How do you calculate enthalpy change?
  
• What is the formula of titanium(II) oxide?
  
• What VSEPR shape is #H_2O#?
  
• Why do you think it is important that biologists have a good understanding of chemistry?
  
• What are examples of alpha decay?
  
• Question #1926f
  
• Why is viscosity classified as a physical property?
  
• Why aren’t glucose and protein normally found in urine?
  
• What are some examples of enthalpy?
  
• Question #087d4
  
• What process allows you to smell perfume at a distance from the source?
  
• How do you find an empirical formula from mass percent?
  
• What is the difference between the independent and dependent variable?
  
• How many divisions are there in meiosis?
  
• Jim's pay is £180 each week. Jim asks his boss for an increase of £20 a week. Jim's boss offers him a 10% increase. Is the offer from Jim's boss more than Jim asked for?
  
• Question #16c23
  
• What is the heat released when 25.0 grams of water freezes at 0°C?
  
• How does an allele determine a genotype?
  
• If the pressure is reported as #750*mm*Hg#, what is the pressure in atmospheres?
  
• Question #58a39
  
• Question #849a9
  
• How can I draw covalent bonds?
  
• Are covalent bonds formed between two nonmetals?
  
• How do you solve this system of equations: #7x + y = 11;- 10x - 5y = 20#?
  
• What are the steps of light-dependent reactions of photosynthesis?
  
• When DNA is replicated, or copied, the ladder splits as the bases separate. New units are added to each half of the DNA molecule. How does this create two identical molecules of DNA?
  
• How do you convert #1.75# from radians to degree?
  
• What are the coefficients needed to balance #Pb(NO_3)_2 + NaI -> PbI_2 + NaNO_3#?
  
• Question #ad016
  
• What are the points of saturation?