Define rate of reaction. Explain the term activation energy. What changes occur in the nucleus of an atom when beta decay occurs? Define the atomic radius(covalent radius) The structure of aspirin is ahown. How many moles are there in 3.6g of the pure conpound? Complete the quation: C2H5OH+Na--> What is the % by mass of chromium in sodium dichromate? Name the fraction obtained from crude oil that's used as a fuel for jet aircraft. Draw the structure of ethanal and draw a rectangle around it's functional group. What's meant by heterogeneous catalysis? Identify a compound responsible for the presence of permanent hardness of water . State 2 ways a chemist might conclude from observations taken during a melting point measurement that a salt sample was pure. What spectroscopic technique is used to detect heavy metals e.g. lead or murcury
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- Q1What changes occur in the nucleus of an atom when beta decay occurs?An electron is converted into a neutron, releasing a proton and a neutrino.A proton is converted into a neutron, releasing an electron (beta particle) and a neutrino.A neutron is converted into a proton, releasing an electron (beta particle) and an antineutrino.A proton is converted into a neutron, releasing a positron (beta positive particle) and a neutrino.30s
- Q2What is the % by mass of chromium in sodium dichromate?48.9%36.8%25.1%62.3%30s
- Q3Name the fraction obtained from crude oil that's used as a fuel for jet aircraft.GasolineKeroseneLubricating oilDiesel30s
- Q4What spectroscopic technique is used to detect heavy metals (e.g., lead or mercury)?Ultraviolet-Visible SpectroscopyNuclear Magnetic Resonance SpectroscopyAtomic Absorption SpectroscopyInfrared Spectroscopy30s
- Q5Define the atomic radius (covalent radius)The atomic radius (covalent radius) is the size of an atom in a crystal lattice structure.The atomic radius (covalent radius) is defined as one half the distance between the nuclei of two atoms of the same element that are covalently bonded.The atomic radius (covalent radius) is the distance from the nucleus to the outermost electron in an atom.The atomic radius (covalent radius) is the sum of the radii of the nucleus and the valence electrons.30s
- Q6What's meant by heterogeneous catalysis?Heterogeneous catalysis is a type of catalysis in which the catalyst is in a different phase (solid, liquid, or gas) from the reactants.Heterogeneous catalysis is a type of catalysis where the catalyst forms a homogeneous solution with the reactants.Heterogeneous catalysis is a type of catalysis where the catalyst is in a different chemical state than the reactants.Heterogeneous catalysis is a type of catalysis in which the catalyst is in a gaseous phase along with the reactants.30s
- Q7How many moles are there in 3.6g of the pure compound?0.04 moles0.2 moles0.6 moles0.4 moles30s
- Q8Identify a compound responsible for the presence of permanent hardness of water.Potassium hydroxide (KOH)Sodium chloride (NaCl)Calcium sulfate (CaSO4) or Magnesium sulfate (MgSO4)Ammonium nitrate (NH4NO3)30s
- Q9State 2 ways a chemist might conclude from observations taken during a melting point measurement that a salt sample was pure.1. The sample decomposes before melting. 2. The melting point is lower than the known value for a pure compound. 3. The sample boils instead of melting.1. The sample emits a strong odor during melting. 2. Observing multiple color changes during the heating process.1. The sample melts over a wide temperature range and exhibits multiple melting points. 2. The color of the sample changes during melting. 3. The melting point of the sample is significantly higher than expected.1. The sample melts at a sharp and consistent temperature range, indicating a narrow melting point. 2. There are no visible impurities or multiple melting events observed during the process.30s
- Q10Draw the structure of ethanal and draw a rectangle around its functional group.The structure of ethanal contains an amino group, which is its functional group. Draw a rectangle around the -NH2 bond in the molecule.The structure of ethanal contains a carbonyl group, which is its functional group. Draw a rectangle around the C=O bond in the molecule.The structure of ethanal contains a hydroxyl group, which is its functional group. Draw a rectangle around the -OH bond in the molecule.The structure of ethanal does not contain any functional groups.30s
- Q11What spectroscopic technique is used to detect heavy metals like lead or mercury?Nuclear Magnetic Resonance SpectroscopyInfrared SpectroscopyAtomic Absorption SpectroscopyUltraviolet-Visible Spectroscopy30s
- Q12What is the chemical compound responsible for the presence of permanent hardness of water?Ammonium sulfate ((NH4)2SO4)Calcium sulfate (CaSO4) and magnesium sulfate (MgSO4)Potassium nitrate (KNO3)Sodium chloride (NaCl)30s
- Q13Which of the following statements best defines the term activation energy in a chemical reaction?The total energy change in a reactionThe energy released during a reactionThe energy difference between reactants and productsThe minimum amount of energy required for a reaction to occur30s