Answer:
9.36 grams NaOH needed
Explanation:
Given Rxn
(NH₄)₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2NH₃(g) + 2H₂O shows a molar reaction ratio of 1-mole (NH₄)₂SO₄ to 2-moles NaOH. If the 15.4 gram sample of (NH₄)₂SO₄ is converted to moles, then 2 times moles of ammonium sulfate will be the molar amount of NaOH needed to completely react. Complete computation by converting moles to grams NaOH; that is, multiply by formula wt. of NaOH (=40g/mol).
moles (NH₄)₂SO₄ = 15.4g/132.14g·mol⁻¹ = 0.117 mole (NH₄)₂SO₄.
moles NaOH = 2 x 0.117-mole = 0.234-mole NaOH needed.
∴grams NaOH needed = 0.234-mole NaOH x 40-g NaOH/mole NaOH = 9.36 grams NaOH needed. (3 sig. figs.)
Then multiply 0.117 mole by 2 => 0.234 mole NaOH needed to completely react with the 0.117 mole (NH₄)₂SO₄. Converting to mole to grams, multiply by formula wt. of NaOH => 0.117 mole x 40g/mole = 9.36 grams NaOH needed.
Which of the following reactions is NOT properly classified?
(A) Synthesis - MgO + CO2 → MgCO3
(8) Decomposition - 2 Fe(OH)3 → Fe2O3 + 3 H2O
(c) Combustion - CO2 + 2 H2O → CH4 + 2 02
(D) Synthesis – 2 Na + Cl2 → 2 NaCl
Write the product for each synthesis reaction . Balance the chemical equation . a) Be+O 2 Li+Cl 2 c) Mg+N 2 d) Al+Br 2 K+O 2
Answer:
j,
Explanation:
The rock in a particular iron ore deposit contains 78% Fe2O3 by mass. How many kilograms of the rock must a mining company process to obtain 1.0 x 103 kg of iron?
Answer:
103 so easy so free dogwater
Explanation:
Mass percentage does not have any unit as numerator and denominator contains the same unit. The mass of rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
Percentage of mass of ferric oxide is = 78% by mass in rock
From this we can interpret the following
100 g of rock contains = 78gram ferric oxide
(100÷78)g of rock contains= 1 gram of ferric oxide
mass of iron in rock =1.0 x 10³ kg = 1.0 x 10⁶ g
(100÷78)×1.0 x 10⁶ g of rock = 1.28×10⁶g of ferric oxide
now 1 mole of ferric oxide contains 2 atoms of iron, so the total mass of iron is 1.28×10⁶g ×2=2.56×10⁶g of iron.
Therefore the mass of rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.
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Which of the following will dissolve most rapidly?
A) Sugar cubes in cold water
B) powdered sugar in hot water
C) powdered sugar in cold water
D) sugar cubes in hot water
Answer:
The correct answer to your Question is B.
Explanation:
Hope you have a great day :)
The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.
Factors responsible for solubilityIncrease in temperature, state of solute and volume will determine the rate at which solubility occurs. The powdered sugar is in less solid state when compared to sugar cubes and therefore will dissolve most rapidly in hot water than a sugar cubes in hot water.
Hence we can conclude that The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.
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PLEASE ANSWER ALL QUESTIONS WILL MARK BRAINLY
1. Calculate the density for the following cube if it’s mass is 1.25 g and each side has a measurement of 3 cm.
2. Would the cube in question 1 float or sink in water? ( Calculate the density for the following cube if it’s mass is 1.25 g and each side has a measurement of 3 cm.)
3. If an irregular-shaped piece of gold is placed into a graduated cylinder and it displaces 15 ml of water, what is the volume of the object?
4.How many elements are in the particle with the chemical formula C2H7N3?
5.How many atoms are in the particle with the chemical formula C2H7N3
Answer:
1. 2.89
2. Will it float in fresh water? Yeah, sure it will!
3. 5g/ml
4. 3 because the letters represent the elements
5. 12
Explanation:
Balance equation Co2(CO3)3(s)=Co2O3(s)+CoO2(g)
Answer:
answer
Explanation:
explination
Substance P is carbon.
Suggest what substances Q and R could be. Give their names.
substance Q .......................................................................................
substance R .......................................................................................
Explanation:
substance Q could be oxygen (O2)
substance R could be carbon dioxide (CO2)
Substance Q could be oxygen ([tex]O_2[/tex])
Substance R could be carbon dioxide ([tex]CO_2[/tex])
What are molecules?The smallest particle of a substance that has all of the physical and chemical properties of that substance.
There are 2 oxygen atoms in 1 molecule of oxygen. It is a di-atomic gas.
Carbon dioxide is a chemical compound composed two oxygen atoms covalently bonded to one carbon atom.
Hence, substance Q could be oxygen ([tex]O_2[/tex]). substance R could be carbon dioxide ([tex]CO_2[/tex])
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if you were to slowly add 0.3 M NaOH to 35 ml if 0.23M HCl how many ml of NaOH solution would be needed to reach the equivalence point??
M1V1 = M2V2
M1 = 0.23 M HCl
V1 = 35 mL
M2 = 0.3 M NaOH
V2 = ?
(0.23 M)(35 mL) = (0.3 M)V2 —> V2 = 27 mL NaOH
How do the terms denature, catalyst, active site, and substrate relate to each other
Explanation:
The enzyme 's active site binds to the substrate. Increasing the temperature generally increases the rate of a reaction, but dramatic changes in temperature and pH can denature an enzyme, thereby abolishing its action as a catalyst. ... When an enzyme binds its substrate it forms an enzyme-substrate complex.
friend,please mark my answer in brainliest answersfriend,please follow me friend,please thanks this answerfriend,please vote it 5 starHow hot is magma?
27 points
Answer:
2200 degrees Fahrenheit
Explanation:
700°C to 1300C where's my points at
How many molecules are in 6.25 grams of N2O5?
Answer:
0.0578647982046175
Explanation:
Here we see the valence shells of oxygen and magnesium.
How will the electrons react to make a stable product?
1 electron will move from oxygen to magnesium.
2 electrons will move from oxygen to magnesium.
1 electron will move from magnesium to oxygen.
2 electrons will move from magnesium to oxygen.
Answer:
2 electrons will move from magnesium to oxygen
Explanation:
Valence electrons have higher energy than the electrons in inner orbits, valence electrons participate in chemical reactions. A certain element's chemical characteristics can also be determined by the quantity of valence electrons that are present. The correct option is C.
What are valence electrons?The amount of electrons an atom must gain or lose in order to achieve the electrical configuration of the nearby noble gas or inert gas is known as valence. "Valence electrons" are described as "non-filled electrons in the outer shells."
The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are minuscule subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.
'Mg' has two valence electrons and 'O' has six valence electrons. So 'Mg' loses its two electrons to 'O' to attain the octet.
Thus the correct option is C.
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what conditions are required for establishing an equilibrium?
Answer:
1. By praying in the day or meditating
Being successful in your life will start with deciding to change in order to Learn. To make this happen, you need a good attitude and discipline. If you are already in the place where you are writing, it cannot be said because you probably like other things in your life very much. Make it a habit to start your day by praying or meditating. This will help you feel that you are more than who you think you are, thus showing that you can make it physical than you think you can and be in a different place in life than the one you are facing right now. Connect with yourself, be confident, and understand that you see better.
2.Be fully present when you are with your family
Family life is the area most associated with work-life balance. Having a good family life is like being at the top of your work-life balance. After all, your family will always be with you in your good and bad days. Friendships may end, but family relationships last. Start making changes in your life by making it in your family life. Make it a habit to spend quality time with them. Be more involved in their life, physically and spiritually.
3.Thank you to people you already know
Good connections are essential in business. It causes you to do more and better work. Good and strong connections in your personal life, on the other hand, allow you to develop yourself in different areas of life. This is another way to achieve balance. Developing your environment and making strong connections helps you learn from other people, broaden your perspective, and even broaden your vision of life. Communicate with the least person you know every day. It's always easier for you to start expanding your network with people you know. Tell him what you are busy with, ask him what he is busy with and if he needs help. Asking for help for yourself will also build trust. And it's okay to ask him if he knows other people who can help you
4.Do something creative
Although the left brain right brain dominance theory has been debunked, the world still cares more about activities attributed to the left brain, such as logic and measurement. Most businesses prefer analytical to creative thinking. And many people decide that creative thinking is impractical and discard it. Whatever your job is, you shouldn't give up your creative qualities. As an employee or employer, you have to be creative for more customers, more work and more marketing. Notice how your blood is pumping and how your adrenaline rises. Only right brain activities and creativity affect your lives. More importantly, the way to improve your vision and create new opportunities for your business and social life is through creativity. If your artist side is dominant, you should devote more time to activities such as painting, music, animation, and literature; maybe even consider starting a blog for yourself. This will help you to balance and add color to your life after a long and monotonous 'left-brain' weighted day.
5.30-minute walks
The first five items consisted of things you need to focus on every day for your emotional, relational, and personal success. But in order to develop and enjoy this success, you must also improve your Physical health. Make it a habit to move. Walk for half an hour a day, go to the gym, or even stretch your body every hour you sit down. Physical activities have many alternatives and benefits. Choose the most convenient and tasteful for you.
Explanation:İYİ GÜNLER
9. What is the atomic number of the atom in the diagram above?
Answer:
the atomic number of the atom can be determine through the number of protons in the nucleus
The protons are usually the atomic number.
A student bends a paperclip rapidly back and forth. When he touches the point where he was
bending the paperclip, he finds that its temperature has increased. This indicates that the
atoms in that part of the paperclip have increased in what kind of energy
Answer:
conservation .
Explanation:
This environment has a lot of trees high temperatures and high humidity all year long which environment is this describing
Answer:
Rainforest
Explanation:
rainforests tend to have high humidity, explaining why you always sweat there. and including high temps.
Nitrogen is an element. What is the smallest particle of nitrogen that has all the properties of nitrogen?
Answer:
The structure of the atom.
Explanation:
The correct answer is - The structure of the atom.
Reason -
An atom is the smallest unit of matter that retains all of the chemical properties of an element.
Please help!!!
Which statement about the manufacture of aluminium by electrolysis is correct?
А Aluminium ions are oxidised to aluminium by gaining electrons.
B Aluminium is extracted from its ore hematite. .
с Molten cryolite is used to dissolve the aluminium oxide.
D Oxygen is formed at the negative electrode.
Molten cryolite is used to dissolve the aluminum oxide is correct.
What is electrolysis?
Electrolysis is a process used to split molecules by passing an electric current through a solution containing ions. It works because the ions in the solution are attracted to the opposite charge of the electrodes in the electrolysis cell. The ions travel towards the electrodes and are either removed from the solution (oxidation) or released into it (reduction). This process is used in a variety of industries, such as metals refining, wastewater treatment, and electroplating.
The process of extracting aluminum from its ore, usually bauxite, involves electrolysis. In this process, the ore is dissolved in molten cryolite and an electric current is passed through it, leading to the oxidation of aluminum ions at the anode and the reduction of oxygen at the cathode. The aluminum is then extracted as a molten metal.
Therefore, option C is the correct answer.
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The element which has atomic number 17 is considered from... A. Metals B. Non-metals C. Noble gas D. No correct answer Please explain with your answer.
Answer:
B. Non-metals
Explanation:
The element with the atomic number of 17 is Cl.
Chlorine belongs to the group 7 in the periodic table. It is a non metal.
Correct option: B. Non-metals
hello, do you think you know the order of this?
Answer:
1. A
2. B
3. D
4. C
Explanation:
Just trust me. Good luck on your test! (I go to K12 as well.)
How many milliliters are in a 30 gallon drum?
Answer:
113562 milliliters are in a 30 gallon drum
Explanation:
because you have to convert gallons into milliliters
could you put my answer as the brainist!!!!!!!
please if you know help
the formula of copper sulfate crystals is CuSo4.5H2O. 400ml of 0.02mol/l copper (ii) sulfate solution is needed to be prepered .
a. calculate the molar mass of the solute .
b. calculate the mass of the solute that sould be weighted to prepare this solution .
c. describe in details the steps of preperation of the solution
Answer: a. 249.5 g/mol
b. 1.996 g
c. Measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve in water until the volume is 400 ml
Explanation:
Molar mass is the sum of atomic masses of all the elements present.
Thus molar mass of [tex]CuSO_4.5H_2O[/tex] = 1(63.5)+1(32)+4(16)+5(18) = 249.5 g/mol
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{given mass of solute}\times 1000}{\text {Molar mass of solute}}\times \text{Volume of solution in ml}}[/tex]
[tex]0.02mol/L=\frac{x\times 1000}{249.5g/mol\times 400}[/tex]
[tex]x=1.996 g[/tex]
c. We need to measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve it in water to make the volume 400 ml.
Can you identify a sample from a living organism by examining it under a microscope? Yes or No
24) Which of these lists the order of sublevels by INCREASING energy? *
3d, 4s, 4p
4s, 3d, 4p
4p, 3d, 4s
4s, 4p, 3d
Answer:
4s, 3d, 4p
Explanation:
(3d,4s,4p) and (4p, 3d, 4s) both are decreasing energy, while (4s,4p,3d) is incorrect order it should be (4s,3d,4p).
Describe particle movement in solid,liquid and gas
Answer:
In a solid, they're really close together and vibrate a LITTLE, in a liquid they're kinda close together but change movement because water will change shape depending on the container they're in. For gas they are spread far from each other and vibrate A LOT
Explanation:
CHEMISTRY
OXIDATION NUMBERS
please help me solve only 3 of those oxidation numbers
NO2
Cr2O72-
KCl
NH3
CaH2
SO42-
Na2O2
SiO2
CaCl2
Answer:
NO2=Nitrogen dioxide
KCL=potassium chloride
NH3=Ammonia
After one week there was a white solid but no liquid in the dish. What had happened to the water in the dish?
Answer:
it disappeared loll jk
it obviously dried
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What causes the differences in physical characteristics like hair color among people?
ООО
different versions of genes
O variations in DNA length
different numbers of chromosomes
variations in cell nucleus size
Answer:
The answer is a
Explanation:
What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? The number of neutrons and electrons The number fo protons and neutrons The number of electrons only The number of protons and electrons
Answer:
The number of protons and neutrons.
Explanation:
Neutrons and Protons can't be removed from nucleus from chemical reactions because they are held together super strong and tight. However, nuclear reactions are strong enough to separate them.
hope this helps :)
Answer:
The number of protons and neutrons
Explanation:
Birds' feet change slowly over time, depending on their habitat. Ptarmigans live in snowy areas and eat pine needles, twigs, and insects. Roadrunners live in deserts and plains and eat anything they can catch. Peregrine falcons live on high perches and use their talons for grasping their prey. Mallards live near water and swim and dive for food.
What is an inherited behavior or physical change that helps an organism survive and reproduce in its environment?
A. adaptation
B. variation
C. evolution
D. species
Answer:
A
Explanation: