pH ranges depending on the solution, for a solution with weak acid pH will be between 4.0-7.0.
What is pH?pH is helps to determine if a solution is acidic or basic in nature.
A pH meter is the instrument that can be used for the measurements.
Methyl orange is used when titrating a strong acid against a weak base.
Therefore, the pH of the solution which is a weak acid will be between 4.0-7.0.
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Examine the following reaction: 5FeCl2(aq) + KMnO4(aq) + 8HCl(aq) → 5FeCl3(aq) + MnCl2(aq) + KCl(aq) + 4H2O(l) Which element has undergone reduction?
The element which has undergone reduction is Manganese (Mn)
Redox reactionFrom the question, we are to determine which element has undergone reduction
First, we will define the terms oxidation and reduction
Oxidation
Oxidation can be defined as gain of oxygen. It can also be defined as an increase in oxidation state
Reduction
Reduction can be defined as loss of oxygen. It can also be defines as a decrease in oxidation state.
Now, we will determine the oxidation numbers of the elements both in the reactants and products sides
For FeThe oxidation state of Fe changed from +2 to +3. An increase in oxidation state indicates oxidation
For ClThe oxidation state of Cl did not change. It is -1 both in the reactants and products sides
For KThe oxidation state of K did not change. It is +1 both in the reactants and products sides
For MnThe oxidation state of Mn changed from +7 to +2. A decrease in oxidation state indicates reduction.
Hence, the element which has undergone reduction is Manganese (Mn).
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NOTE: The oxidation states of O and H (oxygen and hydrogen) did not change.
How is the motion of the water molecules effected by the temperature of the water?
Answer:
Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter. If you get water hot enough, the molecules move so much that the hydrogen bonds that hold them together start to break and the water becomes a gas.
How many electrons do two ethylene monomers () share to form a covalent bond?
Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.
Its 2
Answer:
2 would be the amount to form a covalent bond
What is the difference between the short and long carbon cycles?
Carbon is a versatile substance. As opposed to becoming sugars, carbon gets repurposed to become fossil fuels like coal.
What is carbon cycle ?
The carbon cycle is the ongoing process through which carbon atoms move back and forth between the atmosphere and the Earth. The amount of carbon in this closed environment our planet and its atmosphere does not alter because of this.
The carbon cycle describes how carbon moves among various carbon reservoirs or "carbon sinks" that are present on Earth. It is essential for preserving our planet's carbon balance and stable temperature.
The carbon cycle controls carbon naturally, which is essential for life on Earth. The Earth would be frozen without it.
Thus, the long-term carbon cycle puts carbon in motion. However, this cycle differs from the short-term carbon cycle in that it takes millions of years to complete its circuit
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Calculate the mass, in grams, of 532.0 atoms of cadmium, Cd (1 mol of Cd has a mass of 112.41 g).
The mass, in grams, of 532.0 atoms of cadmium is 9.93 × 10⁻²⁰ g
StoichiometryFrom the question, we are to determine the mass of the given atoms of cadmium
First, we will calculate the number of moles of cadmium present
Using the formula,
[tex]Number\ of\ moles = \frac{Number\ of\ atoms}{Avogadro's\ constant}[/tex]
Then,
Number of moles of Cd present = [tex]\frac{532.0}{6.022 \times 10^{23} }[/tex]
Number of moles of Cd present = 8.83427 × 10⁻²² moles
From the given information,
1 mole of Cd has a mass of 112.41 g
Therefore,
8.83427 × 10⁻²² moles will have a mass of 8.83427 × 10⁻²² × 112.41 g
8.83427 × 10⁻²² × 112.41 = 9.9306 × 10⁻²⁰ g
≅ 9.93 × 10⁻²⁰ g
Hence, the mass, in grams, of 532.0 atoms of cadmium is 9.93 × 10⁻²⁰ g
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Which option describes cations?
A: elements that readily give off electrons in a chemical reaction
B: a family of elements located in Group 17 of the periodic table
C: positively charged ions
D: elements that tend to accept electrons when they engage in chemical reactions
Answer:
C: positively charged ions
Explanation:
C: positively charged ions
The part of the screen where you write or place code is called the _____.
Answer:
screenwriting
Explanation:
Answer:
the editor <3
Explanation:
An atom with the same number of protons and electrons has charge of
Answer:
Explanation:
0
All the charges of the protons are cancelled out by all the charges on the electrons.
A reaction of 58.1 g of Na and 54.9 g of Br2 yields 67.8 g of NaBr . What is the percent yield?
3. Calculate the average atomic mass for the sample of atoms shown below.
Cu-63
Cu-65
A. 63.50 u
B. 63.75 u
C. 64.25 u
D. 64.50 u
Answer:B:63.75
Explanation:(5/8 x 63)+(3/8 x 65)=(0.625 x 63)+(0.375 x 65)=63.75
A. Calculate the molarity of solution of "sodium sulfate" that contains 5.2 grams sodiums sulfate diluted to 500mL.
B. How many moles of sodium are in the solution
A. The molarity of solution containing 5.2 g of sodium sulphate is 0.0732 M
B. The number of mole of sodium in the solution is 0.0732 mole
How to determine the mole of sodium sulphate Na₂SO₄Mass of Na₂SO₄ = 5.2 gMolar mass of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g/mol Mole of Na₂SO₄ =?Mole = mass / molar mass
Mole of Na₂SO₄ = 5.2 / 142
Mole of Na₂SO₄ = 0.0366 mole
A. How to determine the molarity Mole of Na₂SO₄ = 0.0366 mole Volume = 500 mL = 500 / 1000 = 0.5 L Molarity =?Molarity = mole / Volume
Molarity = 0.0366 / 0.5
Molarity = 0.0732 M
B. How to determine the mole of sodium (Na)1 mole of Na₂SO₄ contains 2 moles of Na.
Therefore,
0.0366 mole of Na₂SO₄ will contain = 0.0366 × 2 = 0.0732 mole of Na
Thus, 0.0732 mole of Na is present in the solution.
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Determine the number of moles of H in each sample.
1. 4.56 mol H2O
2. 7.86 mol NH3
3. 0.113 mol N2H4
4. 36.0 mol C10H22
Explanation:
I answered your question in a photo sent
The half life of Uranium-238 is 4.5 billion years and the age of earth is 4.5 X 109 years. What fraction of Uranium-238 that was present when Earth was formed still remains?
The half-lifes of Ur 238 are 4.5 bn years such as the age of the formation of the planet. The earth's formation is 4.5 billion years x 109 years.
The fraction of Ur 238 that was found n the earth still remains to be 1/2 that is 50%.Learn more about the 238 is 4.5 billion years and the age of the earth.
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The abbreviated electron configuration for the lead (IV) ion is?
Answer: I THINK THIS IS THE ONE...
Explanation: This means “the configuration of xenon plus 6s2 4f14 5d10 6p2.”
Which of the following is true about daughter cells?
Which term describes energy stored in the bonds between atoms?
A) Nuclear B)Chemical C)Thermal D) Sound Energy
Answer:
B.) Chemical
Explanation:
The energy stored in the bonds between atoms is referred to as chemical energy. I hope this helps! ^-^
Which sentence describes matter?
A. Matter is a force that acts on mass.
O B. Matter is emitted as a form of energy.
C. Matter is created from heat and light.
D. Matter occupies space and has mass.
Answer:
D.
Explanation: your welcome :)
Sentence that does describe matter
Matter occupies space and has mass.
What is matter?Matter is defined as the physical substance that occupies mass means can be weighed and space means volume.
Supporting answer
Matter is anything that occupies mass and space. It is very different from heat, light and energy. Matter can be weighed and its volume can be measured.
Therefore, Matter occupies space and has mass.
Hence, option D is correct.
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Thomas performed an experiment to measure the temperature of water as he heated it on a hotplate. At the end of his experiment, he plotted the results as shown in the graph below.
Pls I need this
Answer: I think it's C.
Explanation: I can't explain
Answer:
I thought A not C
Explanation:
But ill double check
Construct a model to show the movement of matter and energy from plants into other organisms. Show how mass and energy are conserved before and after each interaction. For example, the beginning substances before an interaction equal the ending substances, and vice versa.
I listed a student example I need something like the example but for photosynthesis asap I will give 100 points to whoever has the correct answer
Plants obtain energy from the sun during photosynthesis and pass it along the food chain.
What is a model?A model is a representation of reality. We use models to understand what the real situation of things is like.
Let us recall that plants are the producers in the ecosystem. Energy flow from plants to animals. Plants obtain energy via the reaction 6CO2 + 6H2O --->C6H12O6 + ATP. This energy is passed along the food chain as organisms feed on each other.
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What are the main reasons we cannot power the earth with 100% of renewable energy? Explain what can be done, or needs to be done to eventually achieve this goal.
Help me please lol TwT
Answer:
the number one reason we cannot power the Earth with 100% renewable energy is because our dependence on nonrenewable energy(fossil fuels)...,but with technological advances in solar energy and the latest innovation in biofuels I wouldn't be surprised if we (humans) are powering our electronics with simply the steps we take in our daily routine.
A rock is a naturally occuring solid mixture of one or more of the following: *
A: minerals, lava, and water
B: minerals, limestone, basalt, and granite
C: minerals, sediment, crystals, and organic matter
D: minerals, clastic, felsic and mafic
Answer:
A
Explanation:
Because minerals and lava
Eddie experimented to find out which freezes at a lower temperature, distilled water or salt water. The steps he used in his experiment are shown below.
1Fill one beaker with 250 mL of room-temperature distilled water
2Fill another beaker with 250 mL of room-temperature salt water
3Measure the mass of the liquid in both beakers
4Place both beakers in a freezer
Observe the temperature at which the liquids freeze
Which of the steps in Eddie's experiment was NOT needed?
A.4
B.2
C.3
D.1
Answer:
the answer is C. 3. measure the mass of the liquid in both beakers
Answer:
C: 3
Explanation:
Lisa is using a calorimeter that contains 255 g of water at 19°C. She places 99 g of a liquid substance inside of the calorimeter and closes the lid. The substance undergoes a reaction and crystallizes. Lisa measures the new temperature of the water inside the calorimeter at 29.2°C. Recall that the specific heat of water is 4.18 J/g-°C. What is the enthalpy of fusion (ΔHf) of the substance? Show all steps of your calculations.
Based on the data provided, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
What is the enthalpy of fusion of a substance?The enthalpy of fusion of a substance is the amount of heat evolved or absorbed when the substance undergoes a phase change from liquid to solid or vice versa.
From the principle of conservation of energy, heat lost = heat gained.
Heat gained by water = heat lost by fluidHeat gained by water = mass × specific heat × temperature change.
Heat lost by liquid = mass × enthalpy of fusion of liquid
255 × 4.18 × (29.2 - 19) = 99 × ΔHf
ΔHf = 109.82 J/g
Therefore, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
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3. Would you expect your experimental results would change if a different gas, such as CO2, were used instead of air? Explain your answer.
The experimental results would change if a different gas, such as CO₂, were used instead of air.
What is Air?This comprises of gases that form the atmosphere and they include:
78.08% nitrogen20.95% oxygen0.93% argon0.04% carbon dioxide, and small amounts of other gases.Due to the presence of other gases in air, there would be a change in experimental results.
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What is one thing about science you love?
Answer:
science tells us that our collective consciousness is rare, I am inspired to love deeper and connect with others.
Which is a process that converts sunlight energy into a compound that stores chemical energy?
phototropism
phototropism
photosynthesis
photosynthesis
respiration
respiration
pollination
pollination
Research more Respiration
If you can’t see it, how do you know it’s there?
Answer:
Our 4 Senses
Explanation:
You see, even though we see cant see something, that doesn't mean that it isn't there, for example, bacteria, the wind, and particles. We cant see any of them, at least with just the human eye, but we still are aware that all those things are there.
Our 4 Senses can help us identify things we cant see, lets start off with our sense of "smell"
Lets say there is a amazing new chef in town who just made the best load of bread, your not sure where her/his restaurant is but you can smell that French bread all the way from your house.
You see, you know that it is there, but you cant see it! All our senses help us identify this, so just to prove my point a bit more, lets try one more sense.
Lets finish the night off with one of our other sense "Hearing"
Lets pretend there is a beautiful bird chirming, you look outside your window but you cant see the little bird, you know its there, but you cant see it.
What I'm trying to say is, even though we cant see something, it doesn't mean it isn't there, and our senses help us!
I hope this helped! If you dont understand something or would like more of an explanation, feel free to contact me! :D
If a car with a mass of 4000 kg is accelerating at a rate of 2 ms and hits a tree what force does it have?
Answer:
8000
Explanation:
it wil be twice the amount of the cars weight
what do i put in the columns?
Answer:
You are putting in the percent error is my guess.
Explanation:
When you were completing this chart what percentage of error was there?
No clue if this is correct!!
HELP I don't understand anything !!!!!
Answer:
-I dont have a calculator on me but I can explain to you how to do it and you can put it in your calculator
Explanation:
-First you have to balance the equation because its not balanced
4Na+2H2O —-> 4NaOH
-After you balance it you have to add up the grams of H2 gas,
-The mass of each element is measured in grams
- You find how many grams each element it by looking at the periodic table and looking at the number at the bottom, thats called the mass
- Afterward if the element mass you are looking for has a small number as its subscript, that means there is more than one, so you must add them together to get the correct amount of grams it has
1+1=2grams
-After that, you take that and convert it to moles
2grams x 1mole/(6.02^23)grams = (unknown) moles
-And finally you convert that answer from moles to liters
(Unknown) moles x 22.4 Liters / 1 mole = FINAL ANSWER
I hope this was helpful, I tried to break it down the best I could for you <3