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Group II A (Group 2) metals form ions by
a. gaining 2 electrons
b. gaining 6 electrons
c. losing 1 electron
d. losing 2 electrons
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- (For Exercises 4546) Solutions containing nickel(II) ion are usually bright green in color. When potassium hydroxide is added to such a nickel(II) solution, a pale-green fluffy solid forms and settles out of the solution. The fact that a reaction takes place when potassium hydroxide is added to a solution of nickel(II) ions is an example of a properly. . The fact that a solution of nickel(II) ion is bright green is an example of a property.a neutral atom will become a cation if it a. loses electrons b. gains protons c. gains electrons d. loses protons2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the following would supply evidence to propose a chemical change has taken place? a. The granules dissolve completely. c. The volume of the liquid increases. b. The liquid gives off heat. d. The granules become smaller. 5. Which of the following does NOT indicate a chemical change is occurring? a.…
- When an atom gains electrons, ita. forms a negatively charged ion.b. forms a positively charged ion.c. forms covalent bonds.d. forms ionic bonds.e. gains atomic mass.3. Which process can separate a mixture of finely powdered iron and wheat flour? A. distillation 3. B. filtration C. using a magnet D. sieving E. sublimationThis law states that the electrical charge of 1 mol of electron is equal to 96,500 coul of electricity A.Galvani’s law b. Faraday’s constant c. Avogadro’s law d. volta’s law e. Faraday’s law
- which is true about the energy of particles and how fast they move. a. More energy means slower moving molecules b. More energy means closer spaced molecules c. More energy means faster moving molecules d. Energy has nothing to do with molecules motiona. If 1.00 g of aluminum hydroxide reacts with 3.00 g of sulfuric acid, what is the mass of water produced? b. Aluminum metal and manganese (IV) oxide react to produce aluminum oxide and manganese metal. What mass of manganese (IV) oxide reacts to produce 1.00 kg of manganese metal? c. Recreational vehicles use propane for cooking and heating. The combustion of propane and oxygen produces carbon dioxide and water. What mass of water is produced from the combustion of 10.0 g of propane, C3H8? Al(OH)3(s)+H2SO4(l)→Al2(SO4)3(aq)+H2O(l)A magnesium ion (Mg2*) has electrons. a. 9 b. 10 С. 12 d. 13
- The mass spectrometer may be used to A. Electrolyze water B. Detect the presence of isotopes C. Increase the mass of atomic nuclei D. Separate different wavelengths of lightSelect from the list below, the Kavalue of aluminium nitrate, Al(NO3)3. (You will have to do a bit of research to answer this question.) A. 6.2 x 10-8 B. 1.8 x 10-5 C. 7.9 x 10-6 D. 7.5 x 10-31. Does sodium (Na) attract or release electrons? How many electrons are involved in the transfer?2. Does chlorine (Cl) attract or release electrons? How many electrons are involved in the transfer? 3. What do you think would happen if a sodium atom and a chlorine atom bumped into each other? For instance, if you consider the different molecules of gas that exist separately as the air you breathe 4. Welders use helium (He) and argon (Ar) gases to blow over the metal during the welding process. Why would they want to use these gases?5. If 10 atoms of magnesium (Mg) and 10 atoms of chlorine (Cl) could bump into each other, could they combine to form a substance? ______________How many molecules would be made? ________________________Would there be any atoms left over? __________________________Which ones? ______________How many? ________________________6. My friend, the inventor, says that she has just made a translucent, light-weight metal by combining aluminum with…