Answers edited by Denise Granger

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