5CO2 should be in the blank spot.
the reaction would be 7
Answer: This is evidence that the solution a mixture.
Explanation:
Mixture :
- It is defined as a substance which is made by mixing two or more different materials.
- No chemical reaction occurs between the mixed materials.
- Usually mixture can be separated into its original components.
A solution in a dish contains 4.0 grams of salt dissolved in 100 grams of water. If 50 grams of the water evaporate is a mixture because it is made up two substances salt and water which can be easily separated out by the means of evaporation.
Given:
Density:8.92g/cm3
Volume:25.8 mL
Now we know that
Mass = density X volume
Substituting the given values in the above equation we get:
Mass = 8.92 x 25.8= 230.136 g
= 230136 mg
Answer:
The correct answer is option A, that is, one valence electron in its third energy shell and option C, that is, 11 electrons and 11 protons.
Explanation:
The outermost electrons and the ones that take part in the process of bonding are termed as valence electrons. The atomic number of sodium is 11, thus, it possesses 11 protons and the atoms are neutral so it suggests that sodium has 11 electrons. By electronic configuration, it can be seen that in sodium, two electrons are present in the first shell, 8 in the second, and only one electron in the third shell, that is, 2.8.1. The electron present in the third shell is the valence electron.