1.pure substance X is solid at room temperature. if the substance is heated to 230 C is melted gradually. if then cooled to room temperature , the liquid can not be frozen.
a). is it possible X of an element or compound.
b). does it a chemical change occured? if so can it be said to undergo an endotherm changing, based on the information provided?
c). can it be said that the liquid is an element , based on the information provided.
2. when a candle that weighs 10 g is burned in oxygen, carbon dioxide and water vapor formed by combustion the weigh more than 10 g. was this case match with the law of conservation of mass. explain it!
3. when carbon burns in oxygen under limited number.it will form two gaseous compounds. suggest theway to differentiate the two compounds with one another.
4. after Mendeev compiled the periodic table, he concluded that the atomic weighs of certain elements was wrong ruling, and this conclusion was apparently correct. how Mendeev was able to predict that several atomic weighs were wrong? why his prediction are not always right.
5. when an aqueous solution of merkuri chloride is added to an aqueous solution of silver nitrate, a white solid forms. identify the white solid and write the balanced equation fro the reaction that occurs.
ANSWER....!
1.a) X is a compound.
Since, X is first compressed, and heated to melt slowly.And unbiased frozen.If you want to freeze, needs a lower temperature.Compound is a compound consisting of two or more elements combine chemically with certain comparisons wthin each molecule.b). chemical changes that occur may be called endothermic reactions. Endothermic reaction is a reaction that is accompanied by heat transfer from the environment to the system (heat absorbed by the system from the environment); characterized by decreased ambient temperature around the system. Substance X is initially solid when heated at a temperature of 230 ℃ to melt in hot environments due to move to the substance, so that the substance to be melted and the temperature of the substance to be higher thanthe temperature of their environment
c). there are elements in the fluid. For example mercury. However, based on information given me to say that it opens the page elements.
2. Law of conservation of mass says that the mass before and after the reaction is the same. The mass of wax in the fuel will be equal to the mass of wax before the fire. Melted candle wax remains, which change shape only. Candles will burn the gas and the amount of energy (heat and light). If the result of burning accommodated and weighed, its mass would equal the mass plus the mass of oxygen candles used in burning it.
3. Based on the material. If the carbon in the fuel with oxygen gas to produce a second compound, probably the first of CO2 gases and gases that produce one more possibility of H2O, how to distinguish, as a result of combustion in the form of a compound which is then how to differentiate based on the chemical properties of each elements and compounds.
4. In 1869, Russian chemist Dmitri Ivanovich Mendeleyev nationality arrange 65 elements known at That time. Mendeleev sort the elements of Increasing atomic mass and chemical propertiesAt the same time, Julius Lothar Meyer made arrangement of elements Such as the dikernukakan by Mendeleyev. Only, Lothar Meyer arrange these elements based on Their physical properties. Although there are differences, but Both Produce the same grouping of elements.Mendeleyev Provide an empty box to place the elements That time it has not been found, Such as elements with mass numbers 44, 68, 72, and 100. Had Mendeleev predicted the properties of elements and it is a prophecy after the elements were the resource persons found. Arrangement of the elements of Mendeleev perfected under the law and Called Mendeleev periodic system.Mendeleev periodic system consisting of groups (elements located in a single column) and period (the Elements the which lie on one line)
5. HgCl2 + 2AgNO3 => Hg (NO3) 2 + 2AgClAgCl precipitate formed on the gray-white.
c). there are elements in the fluid. For example mercury. However, based on information given me to say that it opens the page elements.
2. Law of conservation of mass says that the mass before and after the reaction is the same. The mass of wax in the fuel will be equal to the mass of wax before the fire. Melted candle wax remains, which change shape only. Candles will burn the gas and the amount of energy (heat and light). If the result of burning accommodated and weighed, its mass would equal the mass plus the mass of oxygen candles used in burning it.
3. Based on the material. If the carbon in the fuel with oxygen gas to produce a second compound, probably the first of CO2 gases and gases that produce one more possibility of H2O, how to distinguish, as a result of combustion in the form of a compound which is then how to differentiate based on the chemical properties of each elements and compounds.
4. In 1869, Russian chemist Dmitri Ivanovich Mendeleyev nationality arrange 65 elements known at That time. Mendeleev sort the elements of Increasing atomic mass and chemical propertiesAt the same time, Julius Lothar Meyer made arrangement of elements Such as the dikernukakan by Mendeleyev. Only, Lothar Meyer arrange these elements based on Their physical properties. Although there are differences, but Both Produce the same grouping of elements.Mendeleyev Provide an empty box to place the elements That time it has not been found, Such as elements with mass numbers 44, 68, 72, and 100. Had Mendeleev predicted the properties of elements and it is a prophecy after the elements were the resource persons found. Arrangement of the elements of Mendeleev perfected under the law and Called Mendeleev periodic system.Mendeleev periodic system consisting of groups (elements located in a single column) and period (the Elements the which lie on one line)
5. HgCl2 + 2AgNO3 => Hg (NO3) 2 + 2AgClAgCl precipitate formed on the gray-white.
