Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
What is the concentration of a sodium hydroxide solution if 14.5 mL of it are exactly neutralized by 30.0 mL of a 0.500 M hydrochloric acid solution?
Answer:
1.03 M
Explanation:
Step 1: Write the balanced equation
NaOH + HCl ⇒ NaCl + H₂O
Step 2: Calculate the reacting moles of HCl
30.0 mL (0.0300 L) of 0.500 M HCl react.
0.0300 L × 0.500 mol/L = 0.0150 mol
Step 3: Calculate the moles of NaOH that react with 0.0150 moles of HCl
The molar ratio of NaOH to HCl is 1:1. The moles of NaOH that react are 1/1 × 0.0150 mol = 0.0150 mol.
Step 4: Calculate the molar concentration of NaOH
0.0150 moles of NaOH are in 14.5 mL (0.0145 L).
M = 0.0150 mol/0.0145 L = 1.03 M
How many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃?
4FeCl3+3O2->2Fe2O3+3Cl2
The 2 for the second half of the equation is not a coefficient it’s supposed to be for 2Fe2 Not 2O3.
26.3 mol
46.7 mol
23.3 mol
10.0 mol
Answer:
26.3 mol O₂
Explanation:
Step 1: Write the balanced equation
4 FeCl₃ + 3 O₂ ⇒ 2 Fe₂O₃ + 6 Cl₂
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of FeCl₃ to O₂ is 4:3.
Step 3: Calculate how many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃
We will use the previously established molar ratio.
35.0 mol FeCl₃ × 3 mol O₂/4 mol FeCl₃ = 26.3 mol O₂
Convert from °C to K. 13°C
Answer:
286.15 Kelvin
Explanation:
Answer:
286.15
Explanation:
Hope this helps, if its correct could you mark me as brainliest please?
I can't do Miscellaneous calculations!
E.g.
How many moles of oxygen atoms are present in 2.5 mole of water molecules?
An atom has 23 protons and 24 neutrons. Write both its NAME and it's SYMBOL using isotope notation.
Answer:
Vanadium is the name and the symbol is V #23
Explanation:
Calculate the hydrogen ion concentration of a Nitric acid solution with a pH of 2.11.
[H] = _____ (round to 2 decimal places)
Answer:
0.01 MExplanation:
The hydrogen ion concentration can be found by finding the antilog of the pH
[tex]pH = - log [ {H}^{+} ][/tex]
We have
[tex]2.11 = - log({H}^{+}) \\ find \: \: antilog \: of \: both \: \: sides \\ \\ |{H}^{+}| = {10 }^{ - 2.11} \\ = 0.00776...[/tex]
We have the final answer as
0.01 M to 2 decimal places
Hope this helps you
What is the fixer solution equation?
Answer:
Fixation involves these chemical reactions (X = halide, typically Br−): AgX + 2 S2O32− → [Ag(S2O3)2]3− + X. AgX + 3 S2O32− → [Ag(S2O3)3]5− + X. In addition to thiosulphate the fixer typically contains mildly acidic compounds to adjust the pH and suppress trace amounts of the developer.
Al hacer reaccionar 5g de cinc con ácido sulfúrico se observa que la reacción ocurre en 20s. ¿Cuál será la rapidez de la reacción? Masa atómica del cinc 65,37g.
Answer:
0.0038 mole s-1
Explanation:
La velocidad de una reacción se refiere a la rapidez o la lentitud con que avanza una reacción. Se mide por la cantidad de reactivos que desaparecen por unidad de tiempo o por la cantidad de productos que aparecen por unidad de tiempo.
Número de moles de zinc = 5g / 65.37gmol-1 = 0.076 moles
Velocidad de reacción = 0.076 moles - 0 moles / 20 s - 0s = 0.0038 mole s-1
Need help. Will pay if needed, or give away points. CHEMISTRY
Answer:
C. So electrons can flow from one electrode to another
Explanation:
An electrochemical cell is any cell in which electricity is produced by reason of a chemical change.
An electrochemical cell consists of two electrodes, these two electrodes are connected using a wire.
Usually, electrons flow from one electrode to another via this wire thereby enabling the electrochemical processes of oxidation and reduction in the cell to proceed effectively.
Why do the two electrons spend their time equally between both hydrogen atoms? In other words, why can’t one hydrogen just take the other’s electron?
Chemical properties of matter depend mostly on what?
Answer:
the types of atoms and bonds that a substance contains
Explanation:
Answer:
the types of atoms and bonds that a substance contains
Explanation:
4. Based on their placement on the periodic table, which of the following is more
reactive?
A.Sodium (Na)
B. Magnesium (Mg)
C. Barium (Ba)
D. Neon (Ne)
down there (pls hurry!!)
How many moles of SO3 are in 2.4 *10^23 cules?
Answer:
0.4 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{2.4 {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.3986...[/tex]
We have the final answer as
0.4 molesHope this helps you
Give three examples of energy traveling in waves
Answer:
ELECTROMAGNETIC SPECTRUM. Radios, televisions, mobile phones, and radar use signals made up of electromagnetic waves. These are waves that carry energy as electricity and magnetism at the speed of light. Light we can see is also an electromagnetic wave, but other types of electromagnetic wave are invisible.
Explanation:
~Hope this helps
Does melting sea ice in the Arctic increase sea level directly? Why or why not? How would melting over Antarctica be different?
Explanation:
The ice melting would make more water because ice is water and if it melts it make water.
hope this helps :)
13 : 22
MI SEC
23. Which of the following solutions will reach dynamic equilibrium?
a Supersaturated solution
b Unsaturated solution
C Saturated solution
d None of the above
Answer:
C
Explanation:
The solution that will reach dynamic equilibrium is a saturated solution. The correct option is C.
What is an unsaturated solution?A chemical solution in which the solute concentration is less than its equilibrium solubility is known as an unsaturated solution.
The solvent dissolves the entire solute.
When a solute (typically a solid) is mixed with a solvent (commonly a liquid), two reactions take place at the same time.
Thus, the correct option is C, the saturated solution.
Learn more about saturated solutions.
https://brainly.com/question/1851822
A 3.5L container has a gas pressure of 5.3atm. If the volume is decreases to 1.4L. What will be the new pressure inside the container?
Answer:
your answer for that problem is 34.5
What mass of potassium would need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C? (cpotassium = 0.753 J/g°C)
Answer:
Explanation:
q = mCΔT
m =CΔT/q
ΔT = 57.8°C - 44.3°C = 13.5°C
m = (0.753*13.5)/2350
m = 0.00433 g
The mass of potassium that will need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C is 231.17 g
Data obtained from the question Heat (Q) = 2350 JInitial temperature (T₁) = 44.3 °CFinal temperature of water (T₂) = 57.8 °CChange in temperature (ΔT) = 57.8 – 44.3 = 13.5 °C Specific heat capacity (C) = 0.753 J/gºC Mass (M) =?Q = MCΔT
2350 = M × 0.753 × 13.5
2350 = M × 10.1655
Divide both side by 10.1655
M = 2350 / 10.1655
M = 231.17 g
Learn more about heat transfer:
https://brainly.com/question/6363778
#SPJ2
How would the number of atoms in a 2.02g sample of hydrogen compare to the number of atoms in a 32.00g sample of oxygen
Answer:
Number of atoms is equal.
Explanation:
1 mol of anything contains NA particles.
NA is known as Avogadro's number, 6.02×10²³
We determined the moles of each compound. Both molecules are dyatomic,
H₂ → 2.02 g . 1mol / 2.016 g = 1 mol
O₂ → 32 g . 1mol / 32g = 1 mol
Both have the same amount of moles.
In conclussion, the number of atoms is the same in both samples.
THIS IS ALSO PAST DUE PLEASE ANYONE HELP BRINLIEST GIVEN
Explain how limiting growth is advantageous for the goldfish’s survival in a home aquarium
Answer:
I dont know what ur answers are but mine are option a and b fish will not out grow the tank and Concentration of waste in the water does NOT become harmful to the fish.
Explanation:
Which of the following processes is not an example of physical weathering?
A. acidification
B. abrasion
C. frost action
D. exfoliation
Answer:
acidification
Answer:
I think its A
Explanation:
Hope this helps: )
2. what is the factor in an experiment that a scientist wants to observe, which may change in response to
the manipulated variable; also known as a dependent variable
The Lewis diagram for AlF3 is:
:F:
The electron-pair geometry around the Al atom in AlF3 is
There is/are
lone pair(s) around the central atom, so the geometry of AlF3 is
Submit Answer
Retry Entire Group
9 more group attempts remaining
Answer:
25,000 pairs
Explanation:
The table below shows the speed of sound waves from musical sound sources at 20°C.
Which conclusion can be made based on the information in the table?
Wave speed and wave lengths can vary inversely to produce the same frequency.
Frequency and wave speed can vary directly to produce the same wavelength.
Wavelengths and frequency can vary inversely to produce the same wave speed.
Frequency and wave speed can vary directly to produce the same wave speed.
Answer:
C
Explanation:
Wavelengths and frequency can vary inversely to produce the same wave speed
Answer:
C) Wavelengths and frequency can vary inversely to produce the same wave speed.
Explanation:
edge
an organism that gains energy by feeding on other organism is a
A. consumer
B. predator
C. prey
D. parasite
F. host
Answer: the answer is A
Explanation:
Answer:
The answer to your question is, A. consumer.
Explanation:
Any organism that 'consumes' other organisms is a consumer
Is Ca +O2 ?-->CaO balanced ? explain why or why not
whoever answeres all the questions will get brainliest question
question 1
why is steel not a mineral?
A. is it man-made
B. is it alive
c. is it found in nature
d. is it strong
question 2
which mineral is used to make pencils?
A. diamond
B. jade
c. graphite
d. calcite
question 3
wich mineral is used to make glass
A. emerald
b. quartz
c.copper
D. halite
question 4
wich mineral do we eat
A. silver
b. jade
c. quartz
d.halite
question 4 _____ is the hardest mineral and ____ is the softest
A. quartz, graphite
B. silver, gold
C. diamond , talc
d. halite, calcite
question 5
what is minerals streak
A. the color minerals streak
b. how much the mineral weighs
c. the shape of crystals
d. the color left behind when a mineral is
scraped on porcelain tile
question
question 6
all minerals break at the same time
a. true
b. false
Answer:
1. A
2. C
3. B
4. D
5. D
6. B
Explanation:
I'm not quiet sure on 5 but I'm pretty sure its correct
Select all of the HOMOGENEOUS mixtures from this list (click all that apply).
A. Paint
B. Chili
C. Blood
D. Soil
E. Salt water
Answer:
E is answer
Explanation:
salt water is the answer
Answer:
E.Salt water
Explanation:
Salt water is a homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. The amount of salt in the salt water can vary from one sample to another.
A radioisotope has a half-life of 5 minutes. What fraction of material would remain after
half an hour?