The polarity of a water molecule comes from the uneven distribution of electron density of hydrogen and oxygen atom. The oxygen in the water molecule is more electronegative than the hydrogen. Water has a partial positive charge near the hydrogen atom and a partial negative charge near the oxygen atom. The result of this electrostatic attraction results in the bond called hydrogen bond. Also, because of this bond, it has the ability to dissolve most of the solutes due to its polarity and bonding.
three magnets of different sizes (one small, one medium, and one large) and holds them over
a container of paperclips to see how many are attracted. Her results are shown in the table
below.
What should Alexis do next after examining her experimental results?
Answer:
Alexis should conduct more trials to see if there is a correlation between magnet size and magnetic properties.
Explanation:
Dimitri Mendeleev arranged the elements according to atomic mass and predicted the properties of missing elements. His table, known as the periodic table, was later validated and is now widely used in chemistry. The modern version is organized by atomic number and period.
The arrangement of elements according to atomic mass and the prediction of properties of missing elements was conducted by Dimitri Mendeleev in Russia in 1869. Together with Lothar Meyer from Germany, they recognized the periodic relationship among the known elements at that time. However, Mendeleev went a step further to use his table to predict the existence of elements that had properties similar to known ones such as aluminum and silicon.
Mendeleev's predictions were later validated with the discoveries of gallium in 1875 and germanium in 1886. These discoveries lent great credibility to Mendeleev's work. Today, the periodic table is arranged according to atomic number, following the periodic law. This law states that the properties of elements are periodic functions of their atomic numbers.
Importantly, the periodic table is far more than just an arrangement of elements. It's a vital tool in chemistry that helps predict the chemical behavior of elements and compounds.
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Answer:
selenium, Se
Explanation:
Selenium is the only element that has a melting point below 525 K. Therefore, it would be the only element that would be liquid at that temperature.
At 525 K, only bismuth would be in the liquid phase as its melting point is 544.7 K and boiling point is 1837 K, while all other elements would be in the solid state.
The question asks about the phase of different elements at a specific temperature of 525 K. To answer the question, we need to know the melting and boiling points of these elements: platinum (Pt), selenium (Se), bismuth (Bi), copper (Cu), and calcium (Ca).
At 525 K, bismuth (Bi) would be in the liquid state as its melting point is 544.7 K and boiling point is 1837 K. All other elements mentioned have melting points and boiling points higher than 525 K, so they would be in the solid state.
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