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
lord [1]
2 years ago
11

Can somebody plz help answer all these true and false questions CORRECT!!

Chemistry
1 answer:
goldfiish [28.3K]2 years ago
7 0

Answer:

1-T

2-F

3-T

4-T

Explanation:

big brain

You might be interested in
An isotope has a half-life of 10 minutes. after 20 minutes, what percentage of the original nuclei remain?
Elena-2011 [213]
To solve this, we can use two equations.
t1/2 = ln 2 / λ = 0.693 / λ  
   
where, t1/2 is half-life and λ is the decay constant.

t1/2 = 10 min = 0.693 / λ

Hence, λ = 0.693 / 10 min              -         (1)

Nt = Nο e∧(-λt)    
                
Nt = amount of atoms at t =t time
Nο= initial amount of atoms
t = time taken

by rearranging the equation,
Nt/Nο = e∧(-λt)                  -  (2)

From (1) and (2),

Nt/Nο = e∧(-(0.693 / 10 min) x 20 min) 
Nt/Nο = 0.2500

Percentage of remaining nuclei = (nuclei at t time / initial nuclei) x 100%
                                                     
= (Nt/Nο ) x 100%
                                                      = 0.2500 x 100%
                                                      = 25.00%

Hence, Percentage of remaining nuclei is 25.00%
6 0
3 years ago
Write each mixed number as as a decimal. Use bar notation if the decimal is repeating.
aniked [119]

Number 1 is 4.875 Number 2 is 3.47 repeating

6 0
3 years ago
E. What is one way that your body knows if it is upside-down or not?
Firlakuza [10]

Answer:

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

6 0
3 years ago
Why is it important to control the reaction rate of the chemical process
xxTIMURxx [149]
Mg+2HCl=MgCl_2+H_{2(g)}

The reaction creates dihydrogen, hence if it's uncontrolled it could lead to potentially dangerous amounts of gas being released at once.
8 0
3 years ago
What determines which element an atom is?
Lana71 [14]
C) number of protons.
4 0
3 years ago
Read 2 more answers
Other questions:
  • If 5750 Joules of energy are added to 455 grams of granite at 24.0 C, what is the final temperature of the granite The specific
    15·1 answer
  • The electron configuration of an element is 1s22s22p4 Describe what most likely
    13·1 answer
  • 6 types of asexual reproduction
    14·1 answer
  • A 4.00 gram sample of a solution of sodium chloride in water was heated until all the water had evaporated. The sodium chloride
    8·1 answer
  • HELP!!! Question 10.
    7·2 answers
  • Which expression correctly describes activation energy in a chemical reaction?
    12·1 answer
  • How did elements get to earth?
    7·1 answer
  • Sodium + sulfur → _________________________________
    14·2 answers
  • If 11.87 grams of sand (SiO2) were contained in the mixture, how many atoms of oxygen were in the mixture?
    6·1 answer
  • Good evidence for sodium water
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!