Answers edited by Denise Granger

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