I need to know the answers

Chemistry

1 answer:

suter [353]2 years ago

3 0

If you notice in the graph for antibiotic A, the number of bacteria actually INCREASES as time increases after the antibiotic was given. In the second graph, the amount of bacteria increases just a little bit (likely as the antibiotic sets in) and then decreases until no bacteria is left at all. This means that the antibiotic was the most successful because not only did the amount of bacteria decrease over time, but also all of the bacteria were eventually killed.

The last graph is shown as no antibiotic given. This is a graph showing the control group. There is always a control group in an experiment where nothing is done to the group. This is used to compare the results in the end of the experiment.

You might be interested in

A salt is known to be an alkali metal fluoride. A quick approximate determination of freezing point indicates that 4 g of the sa

nexus9112 [7]

For the answer to the question above, I can't help you directly because I don't have a calculator right now. But I'll show you how to solve this.
use the freezing point depression formula for this one: delta T = i * m * K where K is a constant, m is the molality (mol solute/kg solvent), and i is the van'hoff factor the van hoff factor is the number of ions that your salt dissociates into. Since it's an ALKALI flouride salt, how many ions? k is just a constant, you get it from a table in your textbook somewhere So you have everything to solve for the molality of the solution, once you did that, multiplying it by the mass of water to find the mols of the salt. Take the mass of the salt and divide by this mols to figure out the molar mass, and then compare it with the periodic table to identify the salt.

Mole solute x mass of Water = Mol solute
kg Solvent

then

Mass of solute x 1 = molar mass
mole of solute

4 0

3 years ago

Read 2 more answers

Which of these would have the largest volume??

DerKrebs [107]

Yea, i think it's a shopping mall

8 0

2 years ago

A helium atom has --- protons & --- neutrons ?

inn [45]

1 proton

(found in periodic table)

(atomic mass - atomic number = neutrons
1 - 1 = 0)

0 neutrons

5 0

3 years ago

Before writing the total ionic equation one should always balance the molecular equation .

gtnhenbr [62]

Answer:

True

Explanation:

Inorder to balance a ionic equation you first need to balance the molecular equation.
First count oxidation w.
Break into oxidation and reduction half
Then balance the molecular equation of molecules except Hydrogen and Oxygen.

4 0

2 years ago

Which four practices are examples of how humans use science?

valentinak56 [21]

Answer:

A. Making decisions that help humans survive

B. Developing technologies that help humans thrive

C. Developing explanations based on facts

E. Gathering facts that explain natural events

Explanation:

The above are examples of the practices of how humans use science.

Science has been of tremendous help to humans in making decisions that make humans survive and develop technologies that help humans thrive. It has helped to gather and develop explanations that are based on facts. It has helped to explain natural events.

8 0

3 years ago