• Chemistry Help!!?

    A bottle of cola is removed from the fridge. A heated metal rod is dropped into the freshly opened cold bottle of cola. A fountain of foam shoots out immediately. (a) No new products have formed, so no chemical reaction has occurred. Explain what has happened. (b) Explain why cold soft drink “fizzes” more in your mouth than warm soft drink.... show more
    A bottle of cola is removed from the fridge. A heated metal rod is dropped into the freshly opened cold bottle of cola. A fountain of foam shoots out immediately. (a) No new products have formed, so no chemical reaction has occurred. Explain what has happened. (b) Explain why cold soft drink “fizzes” more in your mouth than warm soft drink. (c) In this demonstration the cola was removed from the fridge. What difference would it make if the cola was at room temperature? (d) Some factories discharge warm, but not hot, water into nearby creeks. The result is less aquatic life or a change in the type of life found there. Based on solubility of gases in water, suggest why this occurs.
    1 answer · Chemistry · 3 years ago
  • Math's Help!!?

    What is the purchase price as a percentage of the overall cost? Purchase price = $150 Overall cost = $7,000
    What is the purchase price as a percentage of the overall cost? Purchase price = $150 Overall cost = $7,000
    2 answers · Mathematics · 3 years ago
  • Psychology Homework Please Help!!!?

    In what ways is a mental health problem different from a mental illness? Give an example of both a mental health problem and a mental illness to highlight the difference. Thank you for helping.
    In what ways is a mental health problem different from a mental illness? Give an example of both a mental health problem and a mental illness to highlight the difference. Thank you for helping.
    Mental Health · 3 years ago
  • Please Help! Maths Homework!?

    A builder wishes to tile a section of a roof in the shape of an isosceles triangle. In order to fix the tiles, it is necessary to lay timber battens across the roof parallel to one another. If the shortest batten is 1 metre long, the longest batten is 5 metres long and 16 battens are required, find: (a) the amount by which adjacent battens differ... show more
    A builder wishes to tile a section of a roof in the shape of an isosceles triangle. In order to fix the tiles, it is necessary to lay timber battens across the roof parallel to one another. If the shortest batten is 1 metre long, the longest batten is 5 metres long and 16 battens are required, find: (a) the amount by which adjacent battens differ in length. (b) the total length of the batten required. Thank you.
    1 answer · Mathematics · 3 years ago
  • Chemistry Help! Please!?

    At room temperature, both ammonia and carbon dioxide are gases. They are also both small molecules about the same size. However, when the temperature is lowered, ammonia forms a liquid (condenses) at a much warmer temperature more than carbon dioxide. Consider the differences in forces between molecules of ammonia compared with carbon dioxide. ... show more
    At room temperature, both ammonia and carbon dioxide are gases. They are also both small molecules about the same size. However, when the temperature is lowered, ammonia forms a liquid (condenses) at a much warmer temperature more than carbon dioxide. Consider the differences in forces between molecules of ammonia compared with carbon dioxide. Explain why these differences cause ammonia to condense before carbon dioxide does. Thank You!
    1 answer · Chemistry · 3 years ago
  • Chemistry Help! Please Help!?

    1. The electron configurations of four elements are: 2, 8, 1= 11, Na Sodium 2, 7= 9, F Fluorine 2, 8, 6= 16, S Sulfur 2, 8= 10, Ne Neon. (a) Which pairs of elements are likely to form an ionic bond? Show the formulas of the ionic compounds. (b) Which pairs of elements are likely to form a covalent bond? Show the formulas of the covalent... show more
    1. The electron configurations of four elements are: 2, 8, 1= 11, Na Sodium 2, 7= 9, F Fluorine 2, 8, 6= 16, S Sulfur 2, 8= 10, Ne Neon. (a) Which pairs of elements are likely to form an ionic bond? Show the formulas of the ionic compounds. (b) Which pairs of elements are likely to form a covalent bond? Show the formulas of the covalent compounds. (c) Which element will be unreactive? Why? 2. CH3OH and HCl both dissolve in water, but the dissolved HCl conducts electricity, while the dissolved CH3OH doesn't. Explain why. 3. The elements carbon and silicon are both group (4) elements. They both form a dioxide (CO2 and SiO2). However CO2 is a gas at room temperature, while SiO2 is an abrasive solid (sand). Explain the different forms in terms of the different structures of each compound. Thank you!!
    1 answer · Chemistry · 3 years ago
  • Chemistry Help!!?

    How does the size of a molecule affect the forces of attraction between molecules? AND The melting point of Sulfur is higher than Phosphorous, and the melting point of Phosphorous is higher than Chlorine. Suggest a reason for this, related to the size of each molecule.
    How does the size of a molecule affect the forces of attraction between molecules? AND The melting point of Sulfur is higher than Phosphorous, and the melting point of Phosphorous is higher than Chlorine. Suggest a reason for this, related to the size of each molecule.
    1 answer · Chemistry · 3 years ago
  • Chemistry Help Please!!!?

    Discuss the strength of attraction between the valence electrons and the nucleus of Magnesium and Aluminium. How does this attraction explain the increase in melting point from Sodium to Aluminium?
    Discuss the strength of attraction between the valence electrons and the nucleus of Magnesium and Aluminium. How does this attraction explain the increase in melting point from Sodium to Aluminium?
    1 answer · Chemistry · 3 years ago
  • Please Help!!!?

    What is the population of the following places in Thailand and what percentage of the total population do they represent? (Thailand Population: 67, 925, 411 Pattaya Phuket Bangkok Chiang Mai Ubon Ratchathani Thank you!!
    What is the population of the following places in Thailand and what percentage of the total population do they represent? (Thailand Population: 67, 925, 411 Pattaya Phuket Bangkok Chiang Mai Ubon Ratchathani Thank you!!
    1 answer · Thailand · 3 years ago
  • Please Help!! Chemistry homework.?

    A piece of magnesium ribbon was placed in a solution of zinc chloride and a reaction was observed. (a) Work out the chemical formula of zinc chloride. (b) Work out the compound that was formed. (c) Write an equation of the full reaction. Identify the spectator ions. (d) Write an ionic equation of the reaction, leaving out the spectator ions. Thank... show more
    A piece of magnesium ribbon was placed in a solution of zinc chloride and a reaction was observed. (a) Work out the chemical formula of zinc chloride. (b) Work out the compound that was formed. (c) Write an equation of the full reaction. Identify the spectator ions. (d) Write an ionic equation of the reaction, leaving out the spectator ions. Thank you!!
    1 answer · Chemistry · 3 years ago
  • Chemistry work Please Help!!?

    Use the reactivity series to predict whether the following compounds will react. Give reasons. (a) An iron nail in a solution of zinc chloride (b) An iron nail in a solution of tin chloride
    Use the reactivity series to predict whether the following compounds will react. Give reasons. (a) An iron nail in a solution of zinc chloride (b) An iron nail in a solution of tin chloride
    1 answer · Chemistry · 3 years ago
  • Please Help! Really need help with chemistry work!!?

    If magnesium was reacted with water: (a) work out the chemical formula of the hydroxide that forms in the reaction. (b) write the balanced chemical equation, showing the state of the compounds in the reaction. Thank you!!
    If magnesium was reacted with water: (a) work out the chemical formula of the hydroxide that forms in the reaction. (b) write the balanced chemical equation, showing the state of the compounds in the reaction. Thank you!!
    2 answers · Chemistry · 3 years ago
  • Psychology help please!!! Read the scenario below and name the ethical principle breached and the reason it was breached.?

    Okay so i had 5 scenario's to read i have done the first four but i just can't seem to get this one. Please help. A psychology lecturer wanted to study techniques for reducing haemophobia (fear of blood). He announced his intention to carry out the study at one of his lectures attended by 150 first-year psychology students. He said that any... show more
    Okay so i had 5 scenario's to read i have done the first four but i just can't seem to get this one. Please help. A psychology lecturer wanted to study techniques for reducing haemophobia (fear of blood). He announced his intention to carry out the study at one of his lectures attended by 150 first-year psychology students. He said that any haemophobic students willing to participate in his study would receive a 10 percent credit towards passing his subject. Ethical principle breached: How this principle was breached: Thank you.
    3 answers · Psychology · 3 years ago
  • Need Help! Please Help!!?

    Before the reaction Weight of crucible and lid: 21.825 grams Weight of crucible, lid and magnesium: 22.125 grams Mass of magnesium: 0.3 grams After the reaction Weight of crucible, lid and contents: 22.259 Mass of product: 0.434 (a) Work out the mass of oxygen in the magnesium oxide. (b) Work out the mole ratio of magnesium to oxygen in... show more
    Before the reaction Weight of crucible and lid: 21.825 grams Weight of crucible, lid and magnesium: 22.125 grams Mass of magnesium: 0.3 grams After the reaction Weight of crucible, lid and contents: 22.259 Mass of product: 0.434 (a) Work out the mass of oxygen in the magnesium oxide. (b) Work out the mole ratio of magnesium to oxygen in the compound. Then work out the empirical formula of the compound.
    1 answer · Chemistry · 3 years ago
  • Homework Help Please!!!?

    A crystalline hydrated zinc sulfate salt has the chemical formula ZnSO4•xH2O, where x is the number of water molecules attached. 8.2 grams of this salt was heated to evaporate the water until 4.6 grams remained. (a) Work out the mass of water evaporated. (b) Work out the value of x in the formula ZnSO4•xH2O. Show your working.
    A crystalline hydrated zinc sulfate salt has the chemical formula ZnSO4•xH2O, where x is the number of water molecules attached. 8.2 grams of this salt was heated to evaporate the water until 4.6 grams remained. (a) Work out the mass of water evaporated. (b) Work out the value of x in the formula ZnSO4•xH2O. Show your working.
    1 answer · Chemistry · 3 years ago
  • R=√2D/5 Find D if R=3?

    1 answer · Mathematics · 3 years ago
  • Expand the brackets, simplify then find the value of n.?

    3(2n + 5)= 10
    3(2n + 5)= 10
    3 answers · Mathematics · 3 years ago