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
Mariana [72]
2 years ago
10

both sides in the war used military observers in hydrogen-filled balloons to watch the enemy's movements

Chemistry
1 answer:
lesya692 [45]2 years ago
7 0

Answer:

Yes.

Explanation:

Hydrogen-filled balloons were widely used by the militaries during World War I (1914–1918). The main purpose of these hydrogen-filled balloons to detect movements of enemy troops and to provide direction to the artillery fire. Balloons were the targets of opposing aircraft because they knew the purpose of these balloons so they hit it whenever seen by the enemies so we can say that both sides used hydrogen-filled balloons as military observer to watch the enemy's movements.

You might be interested in
How many moles of chloride ions are there in 2.5 L of 5 M magnesium chloride?
castortr0y [4]

Answer:

n_{Cl^-}=25molCl^-

Explanation:

Hello,

In this case, since the given 5-M concentration of magnesium chloride is expressed as:

5\frac{molMgCl_2}{L}

We can notice that one mole of salt contains two moles of chloride ions as the subscript of chlorine is two, in such a way, with the volume of solution we obtain the moles of chloride ions as shown below:

n_{Cl^-}=5\frac{molMgCl_2}{L}*\frac{2molCl^-}{1molMgCl_2} *2.5L\\\\n_{Cl^-}=25molCl^-

Best regards.

4 0
2 years ago
The standard Gibbs energy of reaction, ÄG°, for the dissociation of phenol is 56.4 kJ mol-1 at 298 K. Calculate the pKa of pheno
In-s [12.5K]
A is the answer to this question
3 0
3 years ago
True or False
alexdok [17]
1. True 2. False 3.false 4. False 5. True
5 0
3 years ago
What is the purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration?
koban [17]

Answer:

a. The phenolphthalein acts as a color changing indicator to signal the endpoint of the reaction.

Explanation:

Phenolphthalein is an organic substance with chemical formula C_{20}H_{14}O_{4}.

It is a substance commonly used in acid-base titrations to indicate the end point in the titration because phenolphthalein is colorless in acidic solutions but turns a purplish-pink color in basic solutions.

In this way it helps visually to notice when the final point of the titration has been reached.

3 0
3 years ago
Why are isotopes with short half-lives not useful for dating very old rocks?
erma4kov [3.2K]

Answer:

The radioactive isotopes within these brains typically record the ages of the grains-not the time when the sedimentary rock was formed, making it difficult to date using radiometric dating. The half-life of U-235 is 704 million years.

Explanation:

hope this helps but if i'm wrong then i'm sorry..

4 0
2 years ago
Read 2 more answers
Other questions:
  • A container holds 35.8 moles of gas under 10.0 atm of pressure at 70.0 C. What is the volume of the container? 20.6 L 101 L 2080
    12·2 answers
  • Which pair of compounds are structural isomers of each other? pentane and 2-methyl pentane pentane and hexane hexane and 2-methy
    9·2 answers
  • How to separate unreacted iron
    11·1 answer
  • Genetic engineers must modify eukaryotic genes so that they can be expressed in bacterial host cells. The DNA from a eukaryotic
    9·1 answer
  • calculate the number of grams of magnesium in 50g of magnesium sulfide. Use percentage composition and gravimetric factor.
    8·1 answer
  • Larger charges or shorter distances result in greater electric<br> force.<br> TRUE<br> FALSE
    13·1 answer
  • How is the earth’s groundwater and surface water replenished? blank replenishes the earth’s groundwater and surface water.
    12·2 answers
  • Stephan claims that Earth has both a gravitational field and a magnetic field. Which statement best supports his claim?
    13·1 answer
  • How do you use chromatography to separate mixtures
    8·1 answer
  • Pls help!<br><br> Describe ionic and covalent bonding.<br><br> Give an example of each
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!