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
NikAS [45]
3 years ago
12

Why do people use block and teckle systems to move heavy objects?

Chemistry
1 answer:
yaroslaw [1]3 years ago
8 0
H. using a pulley system can reduce the load force, over a greater distance.<span />
You might be interested in
Part A Which acid in each of the following pairs has the stronger conjugate base? Match the words in the left column to the appr
vichka [17]

Answer:

HF

H₂S

H₂CO₃

NH₄⁺

Explanation:

<em>Which acid in each of the following pairs has the stronger conjugate base?</em>

According to Bronsted-Lowry acid-base theory, <em>the weaker an acid, the stronger its conjugate acid</em>. Especially for weak acids, pKa gives information about the strength of such acid. <em>The higher the pKa, the weaker the acid.</em>

<em />

  • Of the acids HCl or HF, the one with the stronger conjugate base is HF because it is a weak acid.
  • Of the acids H₂S or HNO₂, the one with the stronger conjugate base is    H₂S  because it is a weaker acid. pKa (H₂S) = 7.04 > pKa (HNO₂) = 3.39
  • Of the acids H₂CO₃ or HClO₄, the one with the stronger conjugate base is H₂CO₃ because it is a weak acid.
  • Of the acids HF or NH₄⁺, the one with the stronger conjugate base is NH₄⁺ because it is a weaker acid. pKa (HF) = 3.17 < pKa (NH₄⁺) = 9.25
6 0
3 years ago
A student designed an experiment to test the effect on the magnitude of the magnetic field that is generated around the wire loo
kykrilka [37]

Answer: C ) the student’s dependent variable is the magnitude of the magnetic field that is generated

E ) the student’s independent variable is the amount of current that is being passed through the wire

5 0
3 years ago
In the reaction of sodium and oxygen, which atom is the reducing agent?
pishuonlain [190]
Sodium is the reducing agent because a reducing agent is always the donor of electrons.
8 0
3 years ago
Examine the molecular structure of this lipid. What type of lipid is this?
artcher [175]
The correct answer is Phospholipid
3 0
3 years ago
PLS HELP FAST How does the circulatory system work at the tissue level? Cardiac muscle contracts. The heart pumps the blood. Nut
borishaifa [10]

Answer:

b

Explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • N2 + 3H2 2NH3 How many molecules of H2 are in the reaction? molecules How many nitrogen atoms are present? atoms How many moles
    5·1 answer
  • Explain why the temperature of water might increase when a solution forms
    6·1 answer
  • Iodine would have chemical properties most like -
    12·1 answer
  • What is the best explanation for why a particle is striking point x?
    7·2 answers
  • The sun warming the surface of a rock is<br> conduction<br> convection<br> radiation
    6·2 answers
  • How many sulfur atoms are in H2SO4?
    9·1 answer
  • What type of experiment did the student in the passage perform?
    14·1 answer
  • For the following reaction, 35.4 grams of zinc oxide are allowed to react with 6.96 grams of water . zinc oxide(s) + water(l) --
    9·1 answer
  • Do you think climate change is a hoax or is it a scientifically valid disrupter of<br> ecosystems?
    6·2 answers
  • What volume in liters of carbon dioxide will be produced by the reaction of 18.5 liters of oxygen gas at STP?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!