• 263,000 in scientific notation?

    7 answers · 1 week ago
  • Moles of Zn in 2.4×1024 atoms of Zn?

    4 answers · 6 days ago
  • What are the steps to extract a metal?

    What are the steps to extract a metal? Are the ores first concentrated first and then purified?
    What are the steps to extract a metal? Are the ores first concentrated first and then purified?
    4 answers · 6 days ago
  • What is the molecular geometry of CH4?

    Best answer: B. tetrahedral. Doing the Lewis Structure for CH4 would show that around the central atom, there are 4 bonds and no lone pairs.
    Best answer: B. tetrahedral. Doing the Lewis Structure for CH4 would show that around the central atom, there are 4 bonds and no lone pairs.
    4 answers · 6 days ago
  • What is the mass of the atom?

    4 answers · 7 days ago
  • Are these bullets solid silver?

    4 answers · 1 week ago
  • Is energy defined as a substance?

    4 answers · 1 week ago
  • True or False: 5g of water has a higher heat capacity than 5g of lead? 10 pts?

    I know that the answer is False. But how would I know this if I m not given any info.. Is there a way of finding which has higher specific heat capacity by just looking at the periodic table?
    I know that the answer is False. But how would I know this if I m not given any info.. Is there a way of finding which has higher specific heat capacity by just looking at the periodic table?
    5 answers · 1 week ago
  • Is electricity radioactive?

    I must Know
    I must Know
    7 answers · 2 weeks ago
  • What carcinogens are in tobacco?

    Best answer: Long list of them.
    https://www.google.com.au/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/List_of_cigarette_smoke_carcinogens&ved=2ahUKEwiupa6ttuvXAhUIi7wKHfA9DQgQFjAQegQIARAB&usg=AOvVaw0ur36AWJIHlB6uz4GpKL-M
    Best answer: Long list of them.
    https://www.google.com.au/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/List_of_cigarette_smoke_carcinogens&ved=2ahUKEwiupa6ttuvXAhUIi7wKHfA9DQgQFjAQegQIARAB&usg=AOvVaw0ur36AWJIHlB6uz4GpKL-M
    4 answers · 1 week ago
  • A solution contains 15.0 g of glycine, C2H5NO2, in a total solution volume of 0.330 L. What is the concentration of glycine in the solution?

    Best answer: To determine the concentration, divide the number of moles of glycine by total volume.

    Mass of one mole = 2 * 12 + 5 + 14 + 2 * 16 = 75 grams
    n = 15 ÷ 75 = 0.2
    Concentration = 0.2 ÷ 0.330

    This is approximately 0.6 mole per liter.
    Best answer: To determine the concentration, divide the number of moles of glycine by total volume.

    Mass of one mole = 2 * 12 + 5 + 14 + 2 * 16 = 75 grams
    n = 15 ÷ 75 = 0.2
    Concentration = 0.2 ÷ 0.330

    This is approximately 0.6 mole per liter.
    4 answers · 1 week ago
  • Can someone explain using moles with chemical equations?

    I'm in K12 online school but some of the lessons are absolutely horrendous at explaining anything, and this was one of those lessons. I don't understand any of this. I don't even really know how to explain what I'm having trouble with because I don't know what it is. But here's some of the... show more
    I'm in K12 online school but some of the lessons are absolutely horrendous at explaining anything, and this was one of those lessons. I don't understand any of this. I don't even really know how to explain what I'm having trouble with because I don't know what it is. But here's some of the questions I'm asked during quizzes: 1. "For the oxidation of glucose (C6H12O6 + 6O2 → 6H2O + 6CO2), how many moles of oxygen will it take to consume 6 moles of glucose?" 2. "You are asked to make 112 g of iron from iron oxide and excess carbon monoxide. Fe2O3 (s) + 3CO (g) → 2Fe (l) + 3CO2 (g) Approximately how many grams of iron oxide must you use?" 3. "When calcium carbonate is heated, it breaks down into calcium oxide and carbon dioxide. CaCO3 (s) → CaO (s) + CO2 (g) If you heat 25 g CaCO3, approximately what volume of carbon dioxide will you make? Assume the conditions of temperature and pressure are such that 1 mole of any gas will occupy 22.4 L." I finished the quiz and already know the answers (1 is 36, 2 is 160 g, and 3 is 5.6 L) but that's only because I looked them up. I don't get any of it and have no idea how to determine any of these by myself. Please explain this in a thorough yet easy to understand way.
    4 answers · 1 week ago
  • Chemistry question I got to a point where I had the grams per mole and I knew the concentration of the solution. idk what next??

    Sodium carbonate exists in hydrated form, Na2CO3.xH2O, in the solid state. 3.5 g of a sodium carbonate sample was dissolved in water and the volume made up to 250 cm3. 25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the... show more
    Sodium carbonate exists in hydrated form, Na2CO3.xH2O, in the solid state. 3.5 g of a sodium carbonate sample was dissolved in water and the volume made up to 250 cm3. 25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl 2NaCl + CO2 + H2O
    4 answers · 2 weeks ago
  • Some redox reactions are also classified as which of the following? A. Single-displacement B. Decomposition C. Synthesis D. Acid-base?

    Best answer: A. Single-displacement

    For example:
    2 HCl + Ca → CaCl2 + H2
    Best answer: A. Single-displacement

    For example:
    2 HCl + Ca → CaCl2 + H2
    4 answers · 2 weeks ago
  • What is the hardest material in the world? Diamonds or Carbon fiber? Can you mix the two together to get a harder material?

    Different metals mixed together to form alloys What about materials that are non metal like carbon? Other non metals what do they form?
    Different metals mixed together to form alloys What about materials that are non metal like carbon? Other non metals what do they form?
    8 answers · 2 weeks ago
  • Why is propane stored under pressure?

    Best answer: Because it is transported in the form of liquid , if it isn't stored under pressure , it will turn into a gas .
    And thats bad because if it gets into contact with oxygen , an explosion might happen .
    Best answer: Because it is transported in the form of liquid , if it isn't stored under pressure , it will turn into a gas .
    And thats bad because if it gets into contact with oxygen , an explosion might happen .
    4 answers · 2 weeks ago
  • How many oxygen atoms are present in a formula unit of aluminum hydroxide?

    Best answer: Al(OH)3 - gives 3 O atoms.
    Best answer: Al(OH)3 - gives 3 O atoms.
    4 answers · 2 weeks ago