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
Novay_Z [31]
3 years ago
9

How does a scientist use observations to help create the

Chemistry
1 answer:
alexira [117]3 years ago
8 0

Answer:

They use hypotheses to guess a result based on what they already know. Observations are used to record the results of an experiment. Predictions are used to have an expected outcome of a test, thinking the hypothesis is correct. Experiments are used to test the hypothesis.

You might be interested in
Please help!
Len [333]
It will slowly rotten and turn brown
7 0
3 years ago
Is a 93.3% solution dilute or concentrated?<br><br><br> Dilute<br><br><br> Concentrated
oksano4ka [1.4K]

Answer:

<u><em></em></u>

  • <u><em>Concentrated</em></u>

Explanation:

Concentration measures the amount of solute in a solution. There are many expressions of concentration. Some of then are percentage (mass/mass, volume/mass, volume/volume), molarity, molality, mole fraction, among others.

When a solution has a high concentration it is said that it is <em>concentrated; </em>when a solution has a low concentration is is said that is is diluted.

Concentrated solutions expressed in percentage typically have about 80 - 90% (or more) of solute.

Diluted solutions expressed in percentage, tipylcally have about 10% - 20% or less.

But they are not fixed limits. You might say that a 85% solution is concentrated. Acids at 75 % sure are concentrated.

Hence, a 93.3% solution is concentrated, definitely.

3 0
3 years ago
Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar system based only on what they could see wi
sergey [27]

Explanation:

Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model. ... The phases of Venus could not be explained by Ptolemy's Geocentric Model. Galileo knew that the Roman Catholic Church was incorrect.

7 0
2 years ago
Use trigonometric identities to solve tan(2theta)+tan(theta)=0 exactly for 0
hoa [83]
Tan2(∅) ≡ 2tan(∅) / (1 - tan²∅)

Thus,
2tan(∅) / (1 - tan²(∅)) + tan(∅) = 0
2tan(∅) / (1 - tan²(∅)) = -tan(∅)
1 - tan²(∅) = -2
tan²(∅) = 3
∅ = tan⁻¹(√3)
∅ = 4nπ/3
4 0
3 years ago
The reaction of an alcohol with an organic acid produces a compound classified as
Alik [6]
Answer is: <span>a compound classified as ester.
Reaction of synthesis of estrers</span><span> is calling the </span>Fischer esterification<span>, this is reaction of carboxylic acid with an alcohol in the presence of a </span>dehydrating <span>agent (usually sulfuric acid):
R-COOH + R-OH </span>⇄ R-COOR + H₂O.
Esters are less polar than alcohols and can make <span>hydrogen bonds.</span>
5 0
3 years ago
Other questions:
  • 1. Similarities between alchemy and chemistry include
    13·2 answers
  • true or false: Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his pr
    5·2 answers
  • Current nuclear reactors use a process of controlled _____. <br><br> fission <br> fusion
    5·2 answers
  • A slice of Swiss cheese contains 48 mg of sodium
    8·1 answer
  • Why is reading important in science?
    6·1 answer
  • A compound contains 29.27% carbon, 51.22% nitrogen, and 19.50% oxygen. What is the molecular formula if the molar mass is 570.5
    11·1 answer
  • how much current would be measured in a circuit if the light bulb has a resistance of 6 ohms and a voltage of 36 volts
    9·1 answer
  • Strigol is an important plant hormone that is released by crops such as rice and sugarcane. Unfortunately for these plants, stri
    13·1 answer
  • Molecular geometry of NCI 4 +
    5·1 answer
  • The difference between oxygen and ozone
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!