I would honestly say C. All others have ingredients in them that makes them work, the combination of stuff to put out the fire, film is made from a certain material and drugs are an ovbious mixture. Looking at the stars is the only thing you don't need chemistry for.
Answer:
17 electrons
Potassium normally has 19 electrons but the +2 implies that Potassium lost 2 electrons making the total be 17 electrons
Answer:
Gold
Explanation:
We are given that
Mass of sample ,m=385 g
Volume ,V=20mL
We have to find the coin is gold or yellow brass.
We know that
Density=![\frac{Mass}{volume}](https://tex.z-dn.net/?f=%5Cfrac%7BMass%7D%7Bvolume%7D)
Using the formula
![Density=\frac{385}{20}g/mL](https://tex.z-dn.net/?f=Density%3D%5Cfrac%7B385%7D%7B20%7Dg%2FmL)
![Density=19.25g/mL](https://tex.z-dn.net/?f=Density%3D19.25g%2FmL)
![Density\approx 19.3g/mL](https://tex.z-dn.net/?f=Density%5Capprox%2019.3g%2FmL)
Density of coin=19.3g/mL
Density of gold=19.3g/mL
Hence, the coin is gold.
Lemons is the most acid of these 3 fruits. It is high in citric acid.
Given :
Mass of O₂, m = 25.43 g.
To Find :
How many liters of gas will you have at STP.
Solution :
Molecular mass of O₂, M.M = 2 × 16 gram/mole
M.M = 32 gram/mole
Number of moles is given by :
n = m/M.M
n = 25.43/32 mole
n = 0.79 mole
Hence, this is the required solution.