| Measurement | Notation | Generic formula |
|---|---|---|
| Volume-volume percentage | - | (millilitres solute X 100) / (millilitres solution) |
| Molarity | M | (moles solute) / (litres solution) |
| Molinity | - | moles solute) / (kilograms solution) |
| Molality | M | (moles solute) / (kilograms solvent) |
What does the formula 4CH4 represent?
anatomy ch2QuestionAnswerOxygen( atomic number 8) requires how many additional electrons to fill its outer electron shell?2The formula for methane gas is CH4. What does the formula 4CH4 represent?4 molecules, each containing a carbon and 4 hydrogen atoms160 more rows
How do you use the coefficient to calculate the number of atoms in each molecule?
To find out the number of atoms: MULTIPLY all the SUBSCRIPTS in the molecule by the COEFFICIENT. (This will give you the number of atoms of each element.)
Which element commonly has only a proton as nucleus?
Scientists distinguish between different elements by counting the number of protons in the nucleus (Table 4.5. 1). If an atom has only one proton, we know that it's a hydrogen atom. An atom with two protons is always a helium atom.
What are soluble inorganic compounds whose solutions will conduct an electric current?
Week 1 A&P Chp2QuestionAnswerSoluble inorganic compounds whose ions will conduct an electric current in solutionelectrolytesph is measure of the concentration _____ in soulutionhydrogen ionsA solution with ph below 7 isacidicCompounds that stabilize pH by either removing or replacing hydrogen ions arebuffers95 more rows
What does a subscript indicate in a chemical formula?
the number of atomsWe use subscripts in chemical formulae to indicate the number of atoms of an element present in am molecule or formula unit.
What is a subscript in chemistry?
Subscripts are numbers that come after a symbol and below. Subscripts tell you the number of. atoms of that element. If an element does not have a subscript, then it is understood that the subscript is 1. Li2Cl3 has two lithium atoms and three chlorine atoms.
How are these atoms used to make new molecules what types of molecules are made?
They can join up with atoms of the same element or with atoms of different elements. Substances whose molecules contain different types of atom are called compounds. Chemical reactions can CHANGE MOLECULES and when this happens, new molecules and therefore new compounds are formed.
When water freezes ice floats Why quizlet?
Why does ice float on water? When water freezes into ice, the distance between water molecules is larger than in liquid water because the water molecules are organized in a stable lattice. Larger distance means lower density, therefore ice floats on liquid water.
How many atoms are in a human cell?
100 trillion atomsScientists estimate the average cell contains 100 trillion atoms. The number of atoms per cell is about the same as the number of cells in the body.
How is it possible for two samples of hydrogen to contain the same number of atoms yet have different weights?
How is it possible for two samples of molecular hydrogen to contain the same number of atoms, yet have different molecular weights? Hydrogen has three isotopes with different mass numbers.
Which of the following statements best explain why covalent compounds do not conduct electricity when dissolved in water?
When a covalent compound dissolves in water, it does not dissociate into ions. Because there are no free electrons or ions in the water (electrolytes) dissolved covalent compounds can't conduct electricity.
When table salt is put into a glass of water it dissolves the term used for breaking of ionic bonds and the separation of ions is ?
One substance that can do that is salt. Salt is an ionic compound, meaning it is a substance made up of electrically charged molecules called ions. When ionic compounds dissolve in water, the individual ions separate and get surrounded by water molecules—a process called solvation.