I don't know if this will help but here are some chemical properties of acids and bases :
taste: sour (vinegar)
base: bitter (baking soda)
smell: frequently burns nose
base: usually no smell (except NH3)
texture: sticky
base: slippery
reactivity: frequently react with metals to form H2
base: react with many oils and fats
The disease can slow the predator down and the prey can get away easily.
Answer:
b) Silicon and oxygen
Explanation:
A compound is a pure substance that contains two or more atoms chemically joined together. Sand is regarded as a 'compound' because it is made up of two or more atoms that are chemically bonded to one another.
Sand is said to predominantly contain silica, which has a chemical formula of SiO2. Hence, sand can be said to be a compound containing one atom of silicon (Si) and two atoms of oxygen (O2).
Answer:-
Increases
Explanation:-
Atomic size refers to the distance between the nucleus and the outermost valence shell.
As you move down a group, a new shell is added. So the distance of the valence shell increases from the nucleus as we go down a group.
Thus as you move down a group in the periodic table atomic size generally
Answer:
0.06819 atm or 51.8559 torr
Explanation:
To solve this problem we will use the following equation:
ln(P1/P2) = H (vap) / R (1/T2- 1/T1)
Given data:
P1= 760 torr
P2= ?
T1= 78.4 °C+273 = 351.4 K
T2= 19°C + 273 = 292 k
heat of vaporization = 38.56kJ/mol
Now we will put the values in equation:
ln (760 torr/ P2) = 38.56 × 1000 j/ 8.314 j k-1 (1/ 292 - 1/ 351.4)
ln (760 torr/ P2) = 2.6849
760 torr/ P2 = 14.656
P2 = 51.8559 torr
or
P2= 51.8559 torr × 0.001315 atm
P2 = 0.06819 atm
