Answer:
A) litmus is red
Explanation:
To answer this question, it can be helpful to have the color charts. Litmus, phenolphthalein and methyl orange are ways to test the pH of a substance.
<u>Litmus paper</u>
Litmus can tell you if a substance is an acid or a base. You need to put the substance on both red litmus and blue litmus paper.
pH < 7: both papers are red. 3.0 is less than 7.
pH = 7: none of them change color
pH > 7: both papers are blue
<u>Phenolphthalein</u>
When this indicator is added to a substance, the result is either colorless or pink.
0 < pH ≤ 7: colorless. The color is not red or blue for pH 3.0.
pH > 7: pink
<u>Methyl orange</u>
0 < pH < 4: red. The color is not yellow if the pH is 3.0.
4 ≤ pH < 5: orange
pH ≥ 5: yellow
Answer is: <span>50 g of nitrogen has a volume of 40 liters at stp.
m(N</span>₂) = 50 g.
n(N₂) = m(N₂) ÷ M(N₂).
n(N₂) = 50 g ÷ 28 g/mol.
n(N₂) = 1,785 mol.
V(N₂) = n(N₂) · Vm.
V(N₂) = 1,785 mol · 22,4 L/mol.
V = 40 L.
Vm - molare volume on STP.
Answer:
c. Excess fertilizers run off into rivers and create a dead zone.
Explanation:
One very clear cut example of how the same chemicals used to help people can harm the environment is shows is through the excess fertilizers that run off into rivers and create a dead zone.
- Fertilizers are chemical substances that are used to increase farm yield.
- They are rich in nutrients that plants would need to ensure their proper growth.
- When these fertilizers gets washed into water bodies, the cause enrichment and a nutrient glut.
- It takes a lot of energy and oxygen to break them down thereby leading to a dead zone formation.