Describe One Problem That Chemists Working Around 1800 Had To Describe Each Of The Following Terms
1. Define each of the following terms: a period: a horizontal row of elements in the periodic table. b group: a vertical column of elements in the Periodic Table. Elements in a group have similar chemical properties. c noble gas: an inert or non-reactive element that is located in a group 0 (or 18) of the Periodic Table. d transition metal: metallic elements found in groups 3–12 that often have coloured compounds. e alkali metal: metallic elements that are extremely reactive. Alkali metals are located in group 1 of the Periodic Table. f halogen: a non-metallic element found in group 7 (or 17) of the Periodic Table.
2 Examine the Periodic Table on page 85 and answer the following questions: a How many elements are there? 84 b State what …show more content…
They are noble gases. e Name an element that is in the same period as chlorine. Sulfur. f Name an element that is in the same group as chlorine. Fluorine
3 a Describe one problem that chemists working around 1800 had to solve before a workable Periodic Table could be devised. b Name an event that allowed a number of such problems to be sorted out.
c Explain why Newlands’ Periodic Table is different from the one we use today. We now order the elements by increasing atomic number rather than atomic weight. While in his table, elements with similar properties were placed in the same column. d Account for the fact that Mendeleev’s Periodic Table was accepted more readily than the ones devised by John Newlands.
Mendeleev left spaces for elements that were yet to be discovered and predicted their masses and properties. If the order of mass of an element did not match its placement based on its properties, then it was rearranged. When some of his predictions were proved to be correct, no one could doubt that his classification system worked.
4 Which of the following pair of elements would you predict to have the most similar chemical properties b nitrogen and oxygen
Justify your …show more content…
It’s easier to memorize and find the different elements in the periodic table.
1 Explain the difference between each of the following pairs of terms: a element and compound: elements are the ingredients from which every substance is made. Heat or an electrical current cannot separate an element. Its atoms all have the same number of protons. Compound is a substance made from two or more elements that are chemically combined but can be split up by an electric current.
b mixture and pure substance. Mixture is a substance that contains two or more pure substances that are not chemically combined. Mixtures can be separated into two or more different compounds and/or elements by a separation method such as distilling or filtering. Pure substance is something that is the same throughout a substance. Pure substances are elements or compounds.
2 State the Law of Conservation of Mass, and explain what it means.
Law of Conservation of Mass is a chemical law stating that mass is conserved in a chemical reaction. This means that atoms are neither created nor destroyed during a chemical reaction, they are just rearranged.
3 What elements are found in each of the following? a Sodium fluoride (NaF) Sodium and
2 Examine the Periodic Table on page 85 and answer the following questions: a How many elements are there? 84 b State what …show more content…
They are noble gases. e Name an element that is in the same period as chlorine. Sulfur. f Name an element that is in the same group as chlorine. Fluorine
3 a Describe one problem that chemists working around 1800 had to solve before a workable Periodic Table could be devised. b Name an event that allowed a number of such problems to be sorted out.
c Explain why Newlands’ Periodic Table is different from the one we use today. We now order the elements by increasing atomic number rather than atomic weight. While in his table, elements with similar properties were placed in the same column. d Account for the fact that Mendeleev’s Periodic Table was accepted more readily than the ones devised by John Newlands.
Mendeleev left spaces for elements that were yet to be discovered and predicted their masses and properties. If the order of mass of an element did not match its placement based on its properties, then it was rearranged. When some of his predictions were proved to be correct, no one could doubt that his classification system worked.
4 Which of the following pair of elements would you predict to have the most similar chemical properties b nitrogen and oxygen
Justify your …show more content…
It’s easier to memorize and find the different elements in the periodic table.
1 Explain the difference between each of the following pairs of terms: a element and compound: elements are the ingredients from which every substance is made. Heat or an electrical current cannot separate an element. Its atoms all have the same number of protons. Compound is a substance made from two or more elements that are chemically combined but can be split up by an electric current.
b mixture and pure substance. Mixture is a substance that contains two or more pure substances that are not chemically combined. Mixtures can be separated into two or more different compounds and/or elements by a separation method such as distilling or filtering. Pure substance is something that is the same throughout a substance. Pure substances are elements or compounds.
2 State the Law of Conservation of Mass, and explain what it means.
Law of Conservation of Mass is a chemical law stating that mass is conserved in a chemical reaction. This means that atoms are neither created nor destroyed during a chemical reaction, they are just rearranged.
3 What elements are found in each of the following? a Sodium fluoride (NaF) Sodium and