Answers edited by Denise Granger

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