Chemical Compounds & Chemical Formula – Chemistry
These Chemistry chapters discuss atoms, chemical compounds, their chemical formula & the chemical changes they go through.
Fill in the missing information:
Fill in the missing information:
How many protons and neutrons are in an atom of 210Bi ?
Correct Answer :
Number of Protons = 83
Number of Neutrons = 127
A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of ruthenium in these samples:
Use these measurements to complete the entry for ruthenium in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of significant digits.
Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for ruthenium in the Periodic Table we use here on Earth.
Write the name of the element family to which each of the elements in the following table belongs. Your answer should be a word or a short (2 or 3 word) phrase, with no numbers in it.
Write the name of the element family to which each of the elements in the following table belongs. Your answer should be a word or a short (2 or 3 word) phrase, with no numbers in it.
Read each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and enter the chemical symbol of an element that matches. Otherwise check No in the second column.
Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table:
Complete this table.
The chemical formula for calcium bicarbonate is: Ca( HCO₃ )₂
How many hydrogen atoms are in each formula unit of calcium bicarbonate?
Fill in the systematic names of the following chemical compounds.
Note: for compounds containing hydrogen, you may give the common name instead.
Write the empirical formula for at least four ionic compounds that could be formed from the following ions: PO−34, OH−, NH+4, Fe+2
PO₄ᶾ−, OH−, NH₄+, Fe ² +
Decide whether each pair of elements in the table below will form an ionic compound. If they will, write the empirical formula and name of the compound formed in the spaces provided.
Complete the following table:
Complete the table below. For example, in the first row decide whether Sc+3 is a cation or anion. In the second row, write the symbol for the ion that an atom of bromine is mostly likely to form and then decide what type of ion it is.
Classify each chemical compound:
There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change.
Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.
Study the problem and proposed solution below. Is the final answer correct? Then click the No mistakes button. Is the final answer wrong? Then click the button in front of the line with the first mistake and correct the mistake.
Note: don’t worry about correcting the rest of the solution, after the first mistake.
Complete the table below.
A student sets up the following equation to convert a measurement.
(The ?
Fill in the missing part of this equation.
Complete the table below.
