Answers edited by Denise Granger

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