Answer:
B. Moderately active metal
Explanation:
Calculate the number of moles in 8200 grams of iron
Can someone help me with this?
Answer:
150 moles (2 sig. figs.)
Explanation:
to convert from ...
grams to moles => divide by formula weight
moles to grams => multiply by formula weight
this problem:
Given mass of Iron (Fe) = 8200g
formula wt of Fe = 56g/mole
moles = mass/formula wt = 8200g / 56g/mol = 146.42857 moles (calculator) = 150 moles (2 sig. figs.)
The number of moles in 8200 grams of iron is 57.69 moles of Fe.
What is Mole concept ?Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.
The number of particles present in one mole of any substance is Avogadro Number and is equals to 6.023 x 10²³ particles.
Given ;
Weight : 8200 grams of ironTo find ;
Mole (n) : ?Formula used :
Mole (n) = given weight / atomic weight= 8200 / 56 (atomic weight of Fe = 56 gm)
= 157.69 moles of Fe.
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Science help this is my last question
Answer:
P waves travel faster than other waves
Explanation:
P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.
Im Stuck on this question for My Science homework
Answer:
it's not clear
Explanation:
.
Finish the quote: “It’s not only about changing light bulbs, it’s about changing
Answer:
it's about changing attitudes and behavior.
[tex]plz \: help \: me \: it \: is \: due \: 2moro[/tex]
Answer:
hi.
Explanation:
1. B
2. C
3. A
4. B
5.B
hope this helps
During a dilution, what happens to the concentration of a solution?
1
a.)The concentration increases
b.)The concentration decreases
c.) The concentration stays the same
d.)The concentration depends on the nature of the solute.
Answer:
B
Explanation:
Generally, when you dilute something, your goal is to thin your concentration. Even if you added a solute, if your goal is dilution, it will make the concentration decrease.
In a solution, litmus is blue. The pH of the solution could be
1. 10
2. 2
3. 3
4. 4
Answer:
1. 10
Explanation
when litmus paper is blue that means the solution is basic and 10 on the pH scale is the most basic out of all your options
Four scientist collected data on the blood pressure of 30 people. Which scientist most likely had a problem with the experimental design?
Answer:
Scientist 3
Explanation:
2 moles of CaCl2 are dissolved in 0.6 liters of water. What is the molarity?
Answer:
b
Explanation:
what happens in a voltaic cell?
A.chemical energy is changed to a electrical energy
B. electrical energy is changed to chemical energy
C.electrical energy is changed to magnetic energy
D.magnetic energy is changes to electrical energy
Answer:
Hi ,
Answer:
A chemical energy is changed to a electrical energy
What does an electromagnetic spectrum refer to?
O A. The energy of a photon emitted when an electron changes energy
levels
B. An angled piece of glass that splits up light into different
wavelengths
O C. A range of wavelengths of light that increases from one end to the
other
O D. The relationship between energy, wavelength, and frequency of
light
SUBMIS
Answer:
Explanation:
Option C is the correct answer
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the correct option is option C.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
An electromagnetic spectrum refer to a range of wavelengths of light that increases from one end to the other.
Therefore, the correct option is option C.
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When you add the pH value of a solution to the pOH value of the same
solution together, at 25 degrees C, what should the combined value be?
ANSWER CHOICES
1. 7
2. 0, they should cancel each other out
3. 14
4. It’s indeterminate until you know the concentration values of hydrogen and hydroxide ions in solution
Answer:
3
Explanation:
pH+pOH=14
Nitrous acid is classified as an Arrhenius acid because HNO2 contains
1. OH-ions
2. 02-ions
3. NO2-ions
4. H+ ions
4) H+ions is your answer , good morning , have a great day ahead.
Calculate the heat absorbed, in kJ, when 2000. g of water is heated from 20.0 °C to 99.7 °C in an electric kettle
Answer:
666.93 kJ
Explanation:
Using the formula;
Q = m × c × ∆T
Where;
Q = amount of heat absorbed (Joules)
m = mass of substance (g)
c = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
Based on the information provided in the question;
Q = ?
m = 2000g
∆T = 99.7 °C - 20 °C = 79.7 °C
c = 4.184 J/g°C
Using Q = m × c × ∆T
Q = 2000 × 4.184 × 79.7
Q = 666929.6 Joules
To calculate the amount of heat absorbed (Q) in kilojoules (kJ), we say;
1 joule = 0.001 kilojoule
666929.6 Joules = 666929.6 × 0.001
= 666.9296 KJ
Approximately, Q = 666.93 kJ.
If the shape of the moon appears to be increasing over time, what is
this called? *
A.waning
B.waxing
C.crescent
D.gibbous
Answer:
B
Explanation:
Which of the following diatomic gases has the shortest bond between its two atoms?
A. HI
B. O2
C. CI2
D. N2
Why must an electron absorb a quantum of energy to move to a higher energy level?
Answer:
For an electron they start at the first level (n=1) In order to move up to the next level (n=2) the amount of quantom energy to move to this next level the energy must be perfect in order to move. If the quantom energy is to small the electron it doesn't try.
please let me know if the answer is true or false. if false, please tell me what's false about it. the word that they are wondering if it needs to be changed is highlighted
Answer:
false the answer is woody
Explanation:
those are the two types of stems
The heart works directly with which
Liver
Lungs
Kidneys
Brain
Answer:
Lungs.
Explanation:
They bring the blood throughout the body, to help it function properly
Which statement is NOT true regarding Earth's past climate?
Group of answer choices
Earth was very warm 100 million years ago
Tropical forests and swamps covered much of Earth's surface many years ago
A shallow ocean covered much of North America 450 million years ago
Earth's climate has stayed the same throughout the past
Earth climate has stayed same thougout the past
Is NaCl solute or water ?
2. The diagram shows a Zn/MnO2-KOH alkaline dry cell.
In your response, do the following:
• Label all parts.
• Label the cathode and the anode, including the charges on each.
• Show the flow of electrons.
• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.
Answer:
1. Graphite rod (cathode)
2. Positive terminal
3. Solid zinc layer (anode)
4. Paste (reduction takes place here)
5. Negative terminal
Explanation:
This was the only thing i could find on it. hope this helps.
Answer:
Explanation:
• Label all parts.
1. Cathode or Graphite Rod
2. Positive terminal
3. Anode or Solid Zinc layer
4. Electrolyte Paste (reduction takes place here)
5. Negative Terminal (maybe this could also be the Zinc casing)
• Label the cathode and the anode, including the charges on each.
The anode is the zinc layer is negatively charged and the cathode is the graphite rod is positively charged.
• Show the flow of electrons.
The zinc casing is oxidized and the electrons flow along the zinc layer, into the negative terminal, and then out the negative terminal. The electrons move from the wire to the graphite rod. Then from the rod the electrons move to the paste, then the past goes through reduction. The anode gets a negative charge as electrons are released, and the cathode gets a positive charge as the electrons, which are negatively charged, are consumed.
• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.
Alkaline dry cells use spontaneous oxidation-reduction reactions to convert chemical energy to electrical energy. According to the lesson ‘’Half-reactions are combined in a small casing, but still separated into half-cells.’’
Set the Room temp. to -10.0 °C and observe. What is happening?
plzzz i need help on the ASAP no files/links
Answer:
its getting colder
Explanation:
Which of the following represent Dinitrogen tricarbide
1) NC
2) NC2
3) N2C2
4) N203
Answer:
I think is nc2 that representsWhat mass of NaOH is in 250 mL of a 3.0M NaOH solution
Explanation:
Explanation: It's a 3.0 M solution so 1 litre of solution contains 3 moles of NaOH. 250 ml of solution therefore contains 0.25 x 3 = 0.75 moles of NaOH. The molar mass of NaOH is 39.9971 g/mol, so 250 ml of this solution contains 0.75 x 39.9971 = 29.99 g, or if you round it up 30.0 g.
30g of NaOH is in 250 mL of a 3.0M NaOH solution.
What is Mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Volume of NaOH = 250 ml
Concentration = 3M
number of moles = concentration × volume (L)
= 3 × 0.25
= 0.75 moles
mass = moles × molar mass
= 0.75 × 40
= 30 g
Therefore, 30g of NaOH is in 250 mL of a 3.0M NaOH solution.
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WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREATFUL!!! WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREATFUL!!!
6. Which type mixture does not allow light to shine through?
A) Ionic
B) Solutions
C) Colloids
D) Suspensions
10. What is a closed system in chemical equilibrium?
Explanation:
6. Which type mixture does not allow light to shine through?
D) Suspensions
10. What is a closed system in chemical equilibrium?
Solution:
A closed system is a system where neither products nor reactants can escape,The heat can be only exchanged freely For Example an ice coolerThe use of closed system for conducting chemical experiment in which temperature does not affect For Example reaching thermal equilibrium-TheUnknownScientist
Can you please help me to answer this?
I give you a brainlest!
WHAT IS THE PH OF LEMON JUICE IF IT HAS A HYDROGEN ION CONCENTRATION [AT]ON[H^ + ]=5.0*10^ -2 M.
Can somebody help me please !!!!!!
Answer:
ph=2
Explanation:
In what areas of the country should this material be marked?
Answer:
Explanation: The goal of every country should be to produce more materials and goods
What is a primary difference between bacteria that are in the
kingdom Archaea and other bacteria?
Answer:
Is there a way you can give a answer made for a 5th grade
Explanation:
