Oxygen is often found in chemical combinations with other elements, such as magnesium. Using the concepts...?
Because oxygen is a strong oxidizing agent meaning that has the ability to take electrons from other elements... also oxygen is strongly electronegative meaning it was the ability to attract electrons. So when heat is added to the magnesium causing it to burn in the presents of oxygen, oxygen can take the two electrons from mag. causing them both to have perfect octets... as a result they now have changes, cuz the exchange of the electrons, the oxygen has a neg 2 change and the mag. has a pos. 2 charge, creating an ionic bond.
Confidence Interval Concepts Question....?
Confidence interval for population mean is Sample mean +/- Margin of error (ME) Margin of error = critical value of z or t * standard deviation / sqrt sample size critical value depends on the degree of confidence. It can be 90% or 95% or 99% or any percentage The test criterion depends on the sample size. If sample size is < 30, t value is used otherwise z value is used standard deviation of population is preferred to that of sample. a) If the degree of confidence is increased, it will affect the ME. The larger the level of confidence , the larger is the ME. Thereby the width of the confidence interval will be larger. The smaller the level of confidence, the smaller is the ME Thereby the width of the confidence interval will be smaller. (If the degree of confidence is decreased the reverse of the above will be the effect) b) If the sample size is increased, It will affect the ME. The larger the sample size, the smaller is the ME. (If the sample size is decreased the larger will be the ME) c) If the ME is increased, it will affect the length of the confidence interval. The larger the ME, the greater is the length of the confidence interval. The smaller the ME, the smaller is the length of the confidence interval. Th above points are also valid for the confidence interval constructed for population proportion or the difference of means of two populations.
1. Describe electronegativity, and explain the trend of electronegativity in the Periodic Table?
The tendency of an atom in a molecule to attract the shared pair of electron towards itself is called its electronegativity. Highest value of electronegativity. [for fluorine] is taken as 4.0 and the lowest one[for caesium] as 0.7 Electronegativity. depends on--------- Atomic Size----Greater the size of the atom,the lesser the electronegativity,since the electrons being further away from the nucleus experience a lesser force of attraction. Nuclear Charge---The greater the nuclear charge,the greater the electronegativity,because increase in nuclear charge causes electrons to be attracted by a greater force, Trends in Electronegativity Across a period------ Since the nuclear charge increases due to an increase in atomic number,electronegativity increases from left to right in a period, For example,in the second period,electronegativity increases from lithium to fluorine, Down a group----- There is an increase in atomic number down a group, i.e. nuclear charge increases,but due to the addition of extra shells,the atomic size increases.The effect of an increase in the atomic size overcomes the effect of an increase in the nuclear charge,hence electronegativity decreases down a group. For example,in the first group it progressively decreases from lithium downwards to francium.
Summarize the five points of Dalton’s atomic theory, and explain at least one change that occurred to the atom?
Yes, this is for homework, But i'm stuck. This is what I have so far... 1. All elements are made up of atoms 2. All Atoms of a element are Identical. 3. The atoms of a given Element are different to those of all other elements. 4. Different Element's Atoms can combine to form Compounds. 5. Atoms cannot be created, destroyed by chemicals, or split into smaller particles. So all I'm really looking for is the second part to this question...? My teacher said I could ask someone!!! :D Thanks!