Answers edited by Denise Granger

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