39088076
Description
Flashcards by sam bailey, updated more than 1 year ago
|
|
Created by sam bailey
about 2 years ago
|
|
| Question | Answer |
| Protons = 35 Neutrons = 22 Electrons = 35 | |
| What name is used for atoms of bromine that have different numbers of neutrons? | isotopes |
| Why do all atoms of bromine have the same chemical properties? | same number of electrons (in outer shell) |
| Hydrogen bromide (HBr) and sodium bromide (NaBr) are compounds of bromine. Draw a dot and cross diagram to represent a hydrogen bromide molecule. Show only the outer electrons in each atom. | |
| Explain how the atoms are held together in a hydrogen bromide molecule. (2) | M1 - shared (two / pair of) electrons M2 - attracted to BOTH nuclei |
| Explain why sodium bromide has a higher melting point than hydrogen bromide. (3) | |
| Acompoundhasthepercentagecomposition13.8%sodium,47.9%bromineand 38.3% oxygen by mass. Calculate its empirical formula. Empirical formula = ................ (3) | |
| is a metal A - B - C - D (1) | B |
| could be diamond A - B - C - D (1) | D |
| is a gas at 20*C A - B - C - D (1) | A |
| contains oppositely charged ions A - B - C - D (1) | C |
| Some of the substances in the table are compounds. What is meant by the term compound? (2) | |
| The electronic configurations of atoms of sodium and chlorine are Na 2.8.1 Cl 2.8.7 Describe the changes in the electronic configurations of sodium and chlorine when these atoms form sodium chloride (3) | |
| Calculate the relative formula mass of sodium chloride (NaCl). Use the Periodic use table to help you. relative formula mass = ..............(2) | |
| Use the the Periodic Table on page 2 to answer this question. The symbol for silver is Ag - As - S - Si | Ag |
| The element with an atomic number of 40 is AI - Ar - Ca - Zr | Zr |
| An atom of an element has the electronic configuration 2.8.3 State the number of the group in the Periodic Table in which this element is found. | 3 |
| An atom of an element has the electronic configuration 2.8.3 Explain your answer in terms of the atom’s electronic configuration. | (The atom has) three electrons in its outer / valence shell |
| An atom of an element has the electronic configuration 2.8.3 State the number of the period in the Periodic Table in which this element is found. | 3 |
| An atom of an element has the electronic configuration 2.8.3 Explain your answer in terms of the atom’s electronic configuration. | (The atom has) electrons in three shells / three shells are occupied (with electrons) |
| An atom of an element has the electronic configuration 2.8.3 Identify the element. | aluminium / Al |
| Bromine is an element in Group 7 of the Periodic Table. (a) What is the name given to the Group 7 elements? alkali metals - alkaline earth metals - halogens - noble gases | halogens |
| ethane – no change (in colour) ethene – (orange to) colourless / decolourises | |
| lithium reacts with water to form an alkali | |
| have the same number of outer shell electrons | |
| Small pieces of lithium and potassium are added to separate large troughs of water. State one observation that would be similar for each element, and one that would be different for each element. (2) similar................. different...................... | |
| Suggest the formula of the compound formed when potassium reacts with oxygen, and when potassium reacts with chlorine. oxygen ........ chlorine ....... | |
| relative atomic mass = ............ (2) | 85 AND 87 calculated (85 × 0.72) + (87 × 0.28) = 85.6 |
Want to create your own Flashcards for free with GoConqr? Learn more.