Response:
Tube 2: 8.26 * 10^-3; Tube 4: 6.83 * 10^-5
Explanation:
For the MIC test's serial dilutions, each tube should contain an equal volume of nutrient broth: 5.0 mL, while the agent's volume per dilution must also match: 0.5 mL.
The serial dilution process followed was:
- Tube 1: 0.5/5.5
- Tube 2: 0.5 mL from tube 1 was diluted with 5.0 mL of broth, resulting in a dilution of tube 2 as (1:11) * (1:11) = (0.5/5.5) * (0.5/5.5) = 1:121 = 8.26 * 10^-3
- Tube 3: similar calculations yield 1:1331 = 7.51 * 10^-4
- Tube 4: yields 1:14641 = 6.83 * 10^-5.
Answer:
H+(aq) + OH-(aq) ⟶ H2O(l)
Explanation:
Step 1: The balanced equation can be presented as
HCN(aq) + KOH(aq) ⟶ H2O(l) + KCN(aq)
H+(aq) + CN-(aq) + K+(aq) + OH-(aq) ⟶ H2O(l) + K+(aq) + CN-(aq)
Step 2: The net ionic equation is formed by removing the spectator ions — those that appear on both sides of the equation — leading us to the final representation:
H+(aq) + OH-(aq) ⟶ H2O(l)
Answer: D) X-rays exhibit lower frequency than microwaves
Explanation:
A scientific statement is one that relies on evidence gathered from experiments and direct observation of the natural world. Such a statement can be corroborated through appropriate experimental methods.
The option D illustrates a scientific statement because it allows for the frequency of both microwaves and X-rays to be assessed and contrasted. This process entails experimental and observational techniques, which validates it as a scientific statement.
Answer: The correct choice is (b).
Explanation:
We have the mass of Magnesium at 97.22 g, and the molar mass of Magnesium is 24.305 g/mol.
Therefore, the calculation for the number of moles is as follows.
Number of moles = 
= 
= 4 mol
Additionally, it is known that one mole contains 
atoms/mol. Thus, we calculate the total number of atoms in 4 moles as follows.
= 
atoms
or, = 
atoms
Hence, we conclude that in 97.22 grams of Magnesium, there are atoms.
Answer:
9.69g
Explanation:
To find the needed outcome, we first need to determine the number of moles of N2 present in 7.744L of the gas.
1 mole of gas takes up 22.4L at STP.
Thus, X moles of nitrogen gas (N2) will fill 7.744L, meaning
X moles of N2 = 7.744/22.4 = 0.346 moles
Next, we will convert 0.346 moles of N2 to grams to achieve the result sought. The calculation goes as follows:
Molar Mass of N2 = 2x14 = 28g/mol
Number of moles N2 = 0.346 moles
Find the mass of N2 =?
Mass = number of moles × molar mass
Mass of N2 = 0.346 × 28
Mass of N2 = 9.69g
Hence, 7.744L of N2 consists of 9.69g of N2
