Answers edited by Denise Granger

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• How do you calculate enthalpy change?
  
• Question #1fa7a
  
• How do you find an empirical formula from mass percent?
  
• How can I draw covalent bonds?
  
• What are valence electrons?
  
• Question #3b334
  
• Question #087d4
  
• 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?
  
• Question #3c657
  
• What do protons determine about an element?
  
• Question #849a9
  
• Question #1926f
  
• How do you convert #1.75# from radians to degree?
  
• 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 #67926
  
• What are the steps of light-dependent reactions of photosynthesis?
  
• How do valence electrons affect bonding?
  
• 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?
  
• The empirical formula for #CO_3# was found to have a molar mass of 120 g/mol. What is the molecular formula?
  
• What are the coefficients needed to balance #Pb(NO_3)_2 + NaI -> PbI_2 + NaNO_3#?
  
• What is the balanced equation for photosynthesis?
  
• How does an allele determine a genotype?
  
• Question #d2fe3
  
• Question #16c23
  
• 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?
  
• Question #ad016
  
• 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 correct name for #N_2O_5#?
  
• Are covalent bonds formed between two nonmetals?
  
• Question #f5126
  
• How do you simplify #-5v -5(-8 -6v)#?
  
• Why is the respiration reaction exothermic?
  
• What are the points of saturation?
  
• 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 #02190
  
• How do you write the formula of zinc oxide?
  
• How many divisions are there in meiosis?
  
• The sodium-potassium pump is important in what cell function?
  
• How do you give the six trigonometric function values of 5pi/3?
  
• Question #a04c1
  
• How do you solve #100x^2 = 25#?
  
• What does polar mean in chemistry?
  
• What are the main differences in alpha decay and beta decay?
  
• What is the equation of the line that goes through #(5, -6)# and is perpendicular to #y=9#?
  
• Question #717bc
  
• What VSEPR shape is #H_2O#?
  
• Why is the Hardy-Weinberg equation important?
  
• Why is viscosity classified as a physical property?
  
• What are the five characteristics of a base?
  
• How do you solve this system of equations: #7x + y = 11;- 10x - 5y = 20#?
  
• What is a thylakoid?
  
• What is the difference between the independent and dependent variable?
  
• What are examples of alpha decay?
  
• What is the oxidation number of hydrogen in H2 ??
  
• Why do you think it is important that biologists have a good understanding of chemistry?
  
• What are some examples of enthalpy?
  
• What process allows you to smell perfume at a distance from the source?
  
• Question #58a39
  
• How do you write/draw a Lewis structure for #N#?
  
• How do you calculate the following to the correct number of significant figures?
  
• What does the R stand for in the ideal gas law (PV=nRT)?
  
• If the pressure is reported as #750*mm*Hg#, what is the pressure in atmospheres?
  
• What is the heat released when 25.0 grams of water freezes at 0°C?
  
• How can I balance this chemical equations? Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas.