Answers edited by Denise Granger

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