In redox reaction, one element or compound is reduced and gains electrons, while on the other hand, the other element or compound is oxidized and loses electrons. For this lab, through the given oxidation and reduction numbers from balancing the equation and the electrons, it was shown that Manganese was reduced while Iron was oxidized. Also from the equation, the movement of electrons can be noticed, as it was added or subtracted from the substances. In order to balance an equation, there must be same number of elements on both sides, with the exception of hydrogen and oxygen. From there, in order to balance oxygen, water molecules are enumerated to the opposite of the equation/reaction.
The Magnesium strip dissolved in the process and the test tube got hotter. gas test observations: The Hydrogen burned up in the test tube causing a loud pop|The final products were Hydrogen gas and MgCl (a clear/transparent liquid).| |Mg|A shiny opaque metal. -Grey/metallic||| Discussion Questions 1. Identify the reaction in procedure steps 3 and 5 as endothermic or exothermic. Explain why.
Topic 8, 18 Acids & Bases Problem Set 2 1. What is the Arrhenius definition of an acid? (1) a substance that when dissolved in water increases the concentration of hydrogen ion, H+ 2. What is the Arrhenius definition of a base? (1) a substance that when added to water increases the concentration of hydroxide ion, OH-(aq).
Alkanes composed of only carbon and hydrogen atoms are referred to as hydrocarbons. A hydrocarbon with the hydroxyl group is known as alcohol. The experiment was to determine and examine the structure of the alkanes and alcohols and the presence and relative strength of the two intermolecular forces. Intermolecular forces are the attractions that exist between atoms and molecules. The strength of the intermolecular forces of attraction determines whether a substance will be a solid, a liquid, or a gas.
The first possible property of electrons and protons that led to their discovery was their “positive rays,” positively charged streams of atoms generated in gas discharge tubes from J.J. Thomson’s experiment. When these positive rays were bent of deflected in the presence of electric and magnetic fields and then allowed to strike a film, they left curved spots. B. Si-28 Protons- 14 Electrons- 14 Neutrons- 14 Si-29- Protons- 14 Electrons- 14 Neutrons- 15 Si-30 Protons- 14 Electrons- 14 Neutrons- 16 C. This is false, because the atomic mass of chlorine is the average mass of the all isotopes. IV. We sorted the beans into three isotope groups (1,2, and 3) according to the type of bean.
When LiCl is burned the color of the light is an intense red. When BaCl2 is burned the energy is released in packages of light which its color is yellow-green. When BaCl2 is burned the energy is released in packages of light which its color is yellow-green. Data Table 2: Data processing | Metallic Element | Hypothesis | Observation | Sodium ChlorideNaCl | I though that the light of the energy release was going to be red. Because the number of electrons in this compound is no too high in comparison of other compounds.
What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide? |a. |Br[pic] [pic] NaI [pic] NaBr[pic] [pic] I |c. |Br [pic] NaI[pic] [pic] NaBrI[pic] | |b. |Br[pic] [pic] 2NaI [pic] 2NaBr [pic] I[pic] |d.
During the combustion reaction the ribbon of magnesium metal is heated, it reacts with oxygen from the air in a crucible, producing magnesium oxide: magnesium + oxygen → magnesium oxide We measure the mass of magnesium we use for the reaction, and the mass of magnesium oxide produced at the end of it, then we can work out the mass of oxygen that has been combined with the magnesium. Hypothesis: As we know, the empirical formula of a compound indicates the simplest whole number ratio of atoms of each element present in it. According to Lewis formula of ionic bonding: ionic bonding and the formula of oxidation reaction of Mg: 2Mg + O2 => 2MgO indicates that in one molecule of a magnesium oxide chemical compound there is only one atom of magnesium and one atom of oxygen, therefore by carrying out the experiment the molar ratio of Mg and O is predicted to be 1:1. Method: The materials used in conducting this experiment are as follows: safety goggles, a porcelain crucible with a lid, a length of magnesium ribbon (about 25 cm in length), emery paper, a laboratory balance, a pipeclay triangle, a tripod, a Bunsen burner, and crucible tongs. 1.
Burning Magnesium Question: How will the mass of magnesium change when it is burnt? Evie: The mass will go up because oxygen is being added to the magnesium. I support Evie’s point of view as this has been proven from experiments and supporting evidence. Ethan: Oxygen doesn’t weigh anything, so the mass won’t change. Some scientist’s had this view in the past, which has now been refuted and replaced by more current thinking about how elements are arranged.
In which reaction is dilute sulphuric acid not behaving as an acid? A. H2SO4 + 2NaOH ((((( Na2SO4 + 2H2O B. H2SO4 + BaCl2 ((((( BaSO4 + 2HCl C. H2SO4 + CuO ((((( CuSO4 + H2O D. H2SO4 + Mg ((((( MgSO4 + H2 5. Which words in the table complete the following description of the preparation of copper (II) sulphate? An excess copper (II) oxide was added to dilute sulphuric acid. Th mixture was __1___ to remove the excess of oxide.