1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
TEA [102]
3 years ago
12

Dan wants to test the effects of different amounts of antibiotic on bacteria. While setting up his experiment he makes sure to u

se the same type of antibiotic, the same type of bacteria, and the same type of incubator for each trial. Which phrase below best describes this part of the experiment?
Chemistry
1 answer:
garri49 [273]3 years ago
4 0

Answer:

C

Explanation:

A. analyzing results

B. collecting data

C. choosing controlled variables

D. making a prediction

The correct answer would be choosing <u>controlled variables</u>.

The controlled variables are factors that are kept constant among the different groups of subjects during the course of an experiment so as to be able to isolate the effects of a single factor - the independent variable.

There are basically 3 types of variables in a scientific experiment;

1. The independent variable

2. The dependent variable

3. The controlled variable

The independent variables are the variables whose effects are to be determined in the course of experiments. The dependent variables are the variables that are actually measured during the course of experiments and whose values vary along with that of the independent variables. The controlled variables are other variables required for the experiment but which must be kept constant among subjects in order to be able to isolate the effects of the independent variable.

<em>The correct option is C.</em>

You might be interested in
Balance <br> AI(NO3)3 +<br> H2SO4 →<br> Al2(SO4)3 +<br> HNO3
nikklg [1K]

Answer:

2Al(NO3)3 + 3H2SO4 → Al2(SO4)3 + 6HNO3

Explanation:

i just looked up how to balance it, i dont really know how to balance it exactly

5 0
3 years ago
A force interaction requires at least a(n)
Anastaziya [24]
C.) Action force unless it has potential/stored enerygy

8 0
3 years ago
Read 2 more answers
That's just the tip of the iceberg" is a popular expression you may have heard. It means that what you can see is only a small p
puteri [66]
Answer:

B 1.23 g/cc

Explanation:
For something to float on seawater, the density must be less than 1.03 g/mL. If the object sinks, the density is greater than 1.03 g/mL.

Let’s examine the answer choices. Keep in mind, the ice berg is mostly below the water level.

A. 0.88 g/cc
This is less than 1.03 g/cc, which would result in floating.

B. 1.23 g/cc
This is the best answer choice. The iceberg is mostly beneath the water, but some of it is exposed. The density is greater than 1.03 g/mL, but not so much greater that it would immediately sink.

C. 0.23 g/cc
This is less than 1.03 g/cc, which would produce floating.

D. 4.14 g/cc
This is much greater than 1.03 g/cc and the result would be sinking.
5 0
3 years ago
What are the basic building blocks of proteins?
Anna11 [10]

Answer:

Amino Acids

Explanation:

What Are Proteins Made Of? The building blocks of proteins are amino acids, which are small organic molecules that consist of an alpha (central) carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called a side chain.

8 0
3 years ago
PLEASE HELP <br> What is the pH of a weak acid solution that has an [H+] of 2.1 × 10^–6 M
sveticcg [70]

Answer:

pH ( potential Hydrogen ) is a negative logarithm of molar concentration of hydrogen ions.

pH =  -  log[H {}^{ + } ]

therefore:

pH =  -   log(2.1 \times  {10}^{ - 6} )  \\ { \boxed{pH = 5.68}}

5 0
3 years ago
Other questions:
  • What is the balanced equation for the combustion of sulfur
    9·1 answer
  • How many moles of calcium are there in 5.74 x 1022 atoms of calcium?
    13·1 answer
  • Please help I will mark Brainly!
    12·1 answer
  • A lithium atom starts from rest at a position x = xo and falls toward zinc atom with an acceleration that depends on their separ
    9·1 answer
  • Which of the following elements has the highest electronegativity? hydrogen carbon chlorine fluorine
    5·1 answer
  • How does the structure of this umbrella relate to its function?
    15·1 answer
  • If there are 1.55 x 1024 molecules of hydrogen peroxide (H2O2), what is the mass of the<br>sample? ​
    15·1 answer
  • Definition surface water
    14·2 answers
  • What is the past tense of I'll<br>​
    12·2 answers
  • How many molecules are there in 0.25 moles of oxygen
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!