In a chemical reaction one or more substances are changed into
one or more different substances. For example, when an iron
nail rusts, the iron atoms in the nail are reacting with the
oxygen atoms in the air to form a new compound called iron
oxide (rust). What is an example of a chemical reaction you
have observed?
Answers
An example of a chemical reaction I have observed is the reaction between baking soda and vinegar.
What is chemical reaction?A chemical reaction is a process in which molecules of one or more substances are converted into different molecules. This usually involves a rearrangement of their atoms and an exchange of energy. Chemical reactions can be classified by their type and by the reactants involved. Examples of chemical reactions include reactions that produce new molecules from existing molecules, reactions that break down molecules into simpler forms, and reactions that involve the transfer of atoms. Chemical reactions are essential to life and are responsible for a variety of processes, including photosynthesis and respiration.
When these two substances are mixed together, they react to form carbon dioxide gas, which causes bubbles and foam. This is a type of acid-base reaction in which the acetic acid in the vinegar reacts with the sodium bicarbonate (baking soda) to form carbon dioxide and water.
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Related Questions
25.0 cm³ of a solution containing 0.119 mol/dm³ hydrochloric acid was neutralized by titrating it with sodium carbonate solution which contains 5.3 g of the carbonate in 1 dm³ of the solution. What was the volume of sodium carbonate solution required? The equation for the reaction is: 2HCI Na₂CO3 → 2NaCl + H₂O CO₂
Answers
The volume of sodium carbonate solution required to neutralize the HCl solution is 59.5 cm³
First, let's write the balanced chemical equation for the reaction:
2HCl + Na₂CO₃→ 2NaCl + H₂O + CO₂
From the equation, we can see that 2 moles of HCl react with 1 mole of Na₃CO₃ Therefore, the number of moles of Na₃CO₃ required to neutralize 25.0 cm³ of 0.119 mol/dm³ HCl is:
moles of Na₃CO₃ = (0.119 mol/dm³) x (25.0/1000) dm³ = 0.002975 mol. Next, we need to calculate the volume of the sodium carbonate solution required to provide 0.002975 moles of Na₃CO₃. We can use the formula:
moles = concentration x volume
Rearranging, we get: volume = moles / concentration
The concentration of the sodium carbonate solution is:
mass of Na₂CO₃ = 5.3 g
molar mass of Na₃CO₃ = 2 x 23 + 12 + 3 x 16 = 106 g/mol
moles of Na₃CO₃ in 1 dm³ = 5.3 g / 106 g/mol = 0.05 mol/dm³. Therefore, the volume of sodium carbonate solution required is:
volume = 0.002975 mol / 0.05 mol/dm³ = 0.0595 dm³ = 59.5 cm³
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what mass of glucose c6h12o6 would be required to prepare 5000 mL of a 0.215 M solution
Answers
Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.
To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:
Molarity (M) = moles of solute / volume of solution (in liters)
First, let's convert the volume of the solution from milliliters (mL) to liters (L):
5000 mL = 5000/1000 = 5 L
Now, we can rearrange the formula to solve for moles of solute:
moles of solute = Molarity (M) x volume of solution (L)
moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol
Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:
mass of solute = moles of solute x molar mass of solute
mass of glucose = 1.075 mol x 180.16 g/mol
mass of glucose = 194.0 g (rounded to three significant figures)
Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.
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Why it is true to say that calcium carbonate has both ionic and covalent bonds?
Answers
Answer:
Calcium carbonate is an ionically bonded compound.
Covalent Bond: This bond is formed because atoms share a pair of electrons through an orbital.
C6H12O6 + 602 → 6CO2 + 6H₂O
The most efficient ratio is
1 C6H12O6 6 02.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
A. 1.0 mol C6H12O6 and 3.0 mol O₂
B. 1.5 mol C6H₁2O6 and 3.0 mol O₂
C. 3.0 mol C6H₁2O6 and 6.0 mol O₂
D. 0.5 mol C6H₁2O6 and 3.0 mol O₂
Answers
Answer:
D
Explanation:
The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.
what is biochemistry
Answers
Answer:
Biochemistry or biological chemistry, is the study of chemical processes within and relating to living organisms
Explanation:
13. Which of the following lines (of latitude or longitude) would be represented by 0° Latitude?
14. Which of the following lines (of latitude or longitude) would be represented by 90° North
Latitude?
15. Which of the following lines (of latitude or longitude) would be represented by 90° South
Latitude?
16. Which of the following lines (of latitude or longitude) would be represented by 0° Longitude?
a.south pole b. equator c. prime meridian d. north pole
Answers
Answer:
13. Prime Meridian
14. North Pole
15. South Pole
16. c.
Explanation:
13. The prime meridian is the line drawn north to south at 0° (0 degrees) longitude.
14. The latitude of the North Pole is 90 degrees N, and the latitude of the South Pole is 90 degrees S. Like the poles, some circles of latitude are named.
15. The geographic South Pole is located at 90 degrees south latitude. The geographic South Pole is located at 90 degrees south latitude. The station accommodates up to 250 people during the austral summer. Temperatures there average minus 60 degrees Fahrenheit year-round
16. The meridian that runs through Greenwich, England, is internationally accepted as the line of 0 degrees longitude, or prime meridian
The events describe the formation of an underwater sedimentary rock. Place the events in chronological order.
Answers
The proper numbering is 4, 2, 1, and 3.
The following sequence of actions can be used to describe how an undersea sedimentary rock is formed.
Sedimentary Rock
In a basin, sediments and animal skeletons start to accumulate.
The material that has been deposited starts to become bound together by a glue ingredient brought in by running water, such as calcite or clay. The deposits start to become harder.
The deposits eventually transform into rock that is solid and hard. The new rock is a mixture of several organic and inorganic components.
Existing rocks become sediments as a result of weathering.
What causes sedimentary rocks to form?
Sedimentary rocks are formed when previously existing rocks or pieces of extinct animals accumulate on the surface of the Earth. Sediment that has been buried deeply becomes compacted
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NHCI(s) = NH3(g) + HCl(g) at 427°C, Kp = 4.8. Calculate Kc
Answers
\(\tt Kp=Kc(RT)^{\Delta n}\)
NH₄Cl (s) ⇔ NH₃ (g) + HCl (g)
Δn = 2 (gas only)
R = 0.082
T = 427 + 273 = 700 K
4.8 = Kc (0.082 x 700)²
Kc = 1.45 x 10⁻³
which objects could you stand near to feel the heat
Answers
Answer:
An heater, Oven, sun, and fireplaces
Chose which ever you want
b. How does government funding affect scientific progress? (1 point)
Answers
Answer:
29 percent of federal R&D money goes to universities, 29 percent goes to industry, and another 29 percent goes to researchers who work directly for federal agencies. About 10 percent goes to federally funded labs operated by private contractors.
Answer:
Explanation:
Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.
Write the chemical symbols for three different atoms or atomic cations with 3 electrons
Answers
Hopefully, it was helpful.
HELP ME PLEASE I will mark brainliest
Answers
Answer:
Nice pic there
Explanation:
No need
The SI unit for pressure, the pascal (Pa), is shorthand for
A. m2
B. N/m2
c. N
Answers
The pascal is sorthand for N/m^2
How many atoms of hydrogen are in 3 moles of ammonia, NH3?
Answers
Answer:
\(5.4198\) × \(10^{24}\) atoms of hydrogen
Explanation:
Firstly, we need to know how many atoms of \(NH_{3}\) are there in 3 moles of \(NH_{3}\).
We know that there is \(6.022\) × \(10^{23}\) atoms in a mole of any substance.
\(6.022\) × \(10^{23}\) is Avogadro's Constant
\(6.022\) × \(10^{23}\) × 3 = \(1.8066\) × \(10^{24}\)
Therefore in 3 moles of ammonia, there are \(1.8066\) × \(10^{24}\) atoms.
Next, you should determine how many molecules of an element is present in ammonia.
There is 1 Nitrogen molecule and 3 Hydrogen molecules for every mole of ammonia.
Finally, since we know 3 moles of ammonia contains \(1.8066\) × \(10^{24}\) atoms, we just have to multiply accordingly to get the individual amount of atoms of an element a compound has.
For Nitrogen :
1 × \(1.8066\) × \(10^{24}\) = \(1.8066\) × \(10^{24}\) atoms of nitrogen
For Hydrogen :
3 × \(1.8066\) × \(10^{24}\) = \(5.4198\) × \(10^{24}\) atoms of hydrogen
Therefore, there is \(5.4198\) × \(10^{24}\) hydrogen atoms in 3 moles of ammonia.
Hope this answer helped!How many kilojoules of heat are required to heat 2550 grams of water from 17.5°C to 100.0°C?
Answers
Answer:
800.209
Explanation:
Solid sodium oxide and gaseous water are formed by the decomposition of solid sodium hydroxide (NaOH) .
Write a balanced chemical equation for this reaction.
Answers
Answer:
2NaOH(s) → Na₂O(s) + H₂O(g)
Hope that helps.
Given the following data for water:
Heat of fusion = 334 J/g
Heat of vaporization = 2,256 J/g
Specific heat of solid = 2.09 J/g °C)
Specific heat of liquid = 4.184 J/g °C)
Specific heat of gas = 1.84 J/g °C)
Calculate how much energy is needed to change 100.0 grams of liquid water at 15.0 °C to vapor at 125.0 °C. (3 points)
Oa
O
b
44,000 J
89,400 J
104,000 J
266,000 J
Answers
1. Heating the liquid water from 15.0 °C to 100.0 °C:
q = m * Cp * ΔT
= 100.0 g * 4.184 J/g °C * (100.0 °C - 15.0 °C)
= 34,972 J
2. Vaporizing the liquid water at 100.0 °C:
q = m * Hvap
= 100.0 g * 2,256 J/g
= 225,600 J
3. Heating the water vapor from 100.0 °C to 125.0 °C:
q = m * Cp * ΔT
= 100.0 g * 1.84 J/g °C * (125.0 °C - 100.0 °C)
= 4,600 J
The total energy required is the sum of the three steps:
Q = q1 + q2 + q3
= 34,972 J + 225,600 J + 4,600 J
= 265,172 J
Therefore, the energy needed to change 100.0 grams of liquid water at 15.0 °C to vapor at 125.0 °C is approximately 265,172 J, which is closest to option (d) 266,000 J.
What type of intermolecular force will for between H2O AND CH3OH? Draw and label a picture of this bond. Explain in words how this bond forms.
Answers
Hydrogen bonding, which is unquestionably what we have, will occur from the intermolecular force between the molecules of H2O and CH3OH. Atoms trade or exchange valence electrons to create bonds.
How come we create bonds?Trust and self-esteem are developed in children and adolescents through strong emotional ties. After that, they can leave the family and establish wholesome friendships and other types of social ties. Healthy relationships consequently lower a child's chances of emotional discomfort or antisocial behaviour.
What exactly is a bonds, for example?The government of a country issues government bonds, a sort of fixed-interest bond. These bonds are thought of as low-risk investments. Examples of different kinds of government bonds include T - bills, Municipality Bond, Zero-Coupon Bonds, and others.
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Calculate the osmolarity of a 1.15% (m/v) KBr solution.
Answers
Answer:
1) Convert percent (m/V) to molarity
percent (m/V)=1.15 grams/100ml=1.15 g/0.1L=11.5g/L
molarity of KBr=mol/L=g/L *(1mol/molecular weight of KBr)=(11.5g/L) * (1mol/119.0g/mol)=0.0966 mol/L=0.0966M
2) calculation of osmol from mol
In solution, KBr dissociates into two ions K+ and Br- so there are 2 osmol of KBr per mol
3) calculation of osmolarity=molarity*2=0.0966*2=0.193 Osm or Osmolar
Explanation:
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This image shows a mixture of steam and carbon monoxide reacting to reversibly produce carbon dioxide and hydrogen gas. Write the balanced chemical equation which is taking place in the mixture.
Be sure to include the physical states of each species.
Answers
The reversible production of carbon dioxide and hydrogen gas as a result of a reaction between steam and carbon monoxide. The chemical formula for a balanced reaction is CO (g) + H2O (g) CO2 (g) + H2(g).
Does reversible carbon monoxide reaction result in the production of hydrogen and carbon dioxide gases?Carbon dioxide (CO2) and hydrogen gas are created when carbon monoxide (CO) and water mix (H2O). The process is reversible and every molecule in the balanced equation has a coefficient of 1.
What are the two processes that replenish the atmosphere with carbon in the form of CO2?Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing land use, and the production of concrete with limestone.
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Describe an experiment to show that pressure acts in all directions in liquids.
Answers
We frequently observe kids playing with polythene bags filled with water that have little holes drilled into them at various locations so they can sprinkle water on other kids. Through this experiment, we can say that pressure acts in all directions in liquids.
Liquid's pressureSince both liquids and gases may flow, they are both referred to as fluids. Fluids under rest pressure behave uniformly in all directions.
Weather forecasts can be made using barometers. They track the evolution of atmospheric pressure throughout time.
On weather forecast maps, pressure variations appear as an isobar pattern. Predictions are made using these changes in pressure, and they are fairly accurate when combined with wind observations.
Pressure and depth in liquidsAs you go away from a liquid's surface, pressure rises. for instance: A bucket has three holes that are all the same size. Since there is more pressure at the bucket's bottom, the water spills out more forcefully. Dams are thicker at the bottom for this reason.
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What is the number of C atoms in 0.247 mol of C.
Answers
The number of C atoms in 0.247 mol of C is 1.48 X 10²³ .
The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .
so, The number of C atoms in 0.247 mol of C is _
0.247x6.02x10²³= 1.48 X 10²³.
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URGENT!!! An unknown hydrate of CoCl₂ has been evaporated in a crucible. Given the following data, find the formula and name of the hydrate.
Mass of crucible: 12.090 g
Mass of hydrate before evaporation and crucible: 16.250 g
Mass of hydrate after evaporation and crucible: 12.424 g
Answers
From the given data, the name of the hydrated salt would be \(CoCl_2.83H_2O\).
Formula of hydrateThe formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.
First, we need to determine the mass of the anhydrous salt and the water of hydration.
Mass of crucible (x) = 12.090 g
Mass of hydrated salt + crucible (y) = 16.250 g
Thus, the mass of the hydrated salt can be determined by subtracting x from y.
Mass of hydrated salt = 16.250 - 12.090 = 4.16 g
Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g
Mass of anhydrous salt = z - x
= 12.424 - 12.090
= 0.334 g
Mass of water = 4.16 - 0.334
= 3.826 g
Now, let's find the moles:
Molar mass of \(CoCl_2\) = 129.839 g/mol
Molar mass of water = 18.01 g/mol
Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol
Mole of water = 3.826/18.01 = 0.2124 mol
Dividing through by the smallest mole
\(CoCl_2\) = 0.00257 / 0.00257 = 1
water = 0.2124/ 0.00257 = 83
Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)
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A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of ruthenium in these samples:
isotope mass
(amu) relative
abundance
Use these measurements to complete the entry for ruthenium in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to significant digits.
Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for ruthenium in the Periodic Table we use here on Earth.
Answers
Isotopes are atomic elements with the same proton number. The atomic number of the Ru atom in the periodic table will be 44 and the mass will be 100.9.
What are atomic numbers and mass?Atomic numbers are the number of protons present in the nucleus of the atom. Whereas the atomic mass is the total number of protons and the neutrons of the atom.
The atomic number is the number of protons and remains constant for the same element at different places or planets. Hence, the atomic number of Ruthenium will be 44.
The atomic mass depends on the relative abundance and is calculated as:
\(\begin{aligned}\rm atomic\; mass &= \rm \sum (relative \; abundance \times atomic \; mass) \; of \; each \; isotope\\\\&= (96\% \times 100.91) + (4\% \times 101.90)\\\\&=100.9\end{aligned}\)
Therefore, the atomic mass of Ru is 100.9 and the atomic number is 44.
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What are some positive and negative things about living near a volcano?
Answers
If a volcano erupts a lot of wildlife could be killed, and many species can go extinct because of the eruptions.
If lava is flowing onto a road, people cannot out run it.
People can suffocate on ash
The dehydration of the alcohol functional group is a widely used reaction in organic chemistry. The mechanism is generally accepted to always operate via an ______ step-wise process. The _____ mechanism process will always produce (after dehydration) a ________________ style alkene as major product. The driving force for the production of this ________________ style alkene product is generally going to be determined by stability of the ________ ____________.
Answers
Answer:
EliminationEliminationZaitsevZaitsevCarbocationExplanation:
The mechanism is generally accepted to always operate via an ELIMINATION step-wise process. The ELIMINATION mechanism process will always produce (after dehydration) a ZAITSEV style alkene as major productThe driving force for the production of this ZAITSEV style alkene product is generally going to be determined by stability of the CARBOCATIONElimination mechanism is the removal of two substituents from a molecule in either a one- or two-step mechanism
Carbocation is a molecule containing a positive charged carbon atom and three bonds
The mechanism is generally accepted to always operate via an elimination step-wise process. The elimination mechanism process will always produce (after dehydration) a Zaitsev style alkene as major product. The driving force for the production of this Zaitsev style alkene product is generally going to be determined by stability of the carbocation.
What is dehydration?
Dehydration is a process in which a water molecule releases from the given compound to form an unsaturated compound.
Dehydration process of alcohol is done by the elimination reaction in which water molecule eliminate and due to this dehydration we get an unsaturated product alkene. This dehydration process is go through the formation of carbocation which in turn forms the product. Stability of the product is determined by the Zaitsev rule and according to this rule most substituted product is the major and stable product.
Hence correct options are: Elimination, elimination, Zaitsev, Zaitsev and carbocation.
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21.
THINK SMARTER Pablo had a
cup of shredded wheat cereal,
a cup of low-fat milk, and one
other item for breakfast. He had
about 21 grams of protein.
What was the third item Pablo
had for breakfast?
Answers
About 21 protein grams were in him. Pablo's third breakfast dish was a scrambled egg.
Describe protein.Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bones, skin, and hair. It contributes to the production of hemoglobin, which transports oxygen in the blood, and enzymes, which drive numerous chemical reactions.
What is the primary advantage of consuming protein?Your muscles' primary building material is protein. Therefore, consuming enough protein will help you keep your lean muscle and encourage muscular growth when you engage in strength exercise. Eating a lot of protein can help build muscle mass and strength, according to numerous studies.
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which question is the student most likely trying to answer?
Answers
Answer:
B in my opinion
Explanation:
Answer:
I would say A. perhaps B but I'm leaning towards a.
Which of the following set of quantum numbers (ordered n, ℓ, mℓ ) are possible for an electron in an atom? Check all that apply
a. 2, 1, 3
b. 5, 3, -3
c. 4, 3, -2
d. -4, 3, 1
e. 2, 1, -2
f. 3, 2, 2
g. 3, 3, 1
Answers
the possible quantum numbers (ordered n, ℓ, mℓ ) are:Option B.5, 3, -3 and Option C. 4, 3, -2
The quantum numbers n, ℓ, mℓ represent respectively the principal quantum number, the orbital angular momentum quantum number and the magnetic quantum number.
These are the three most important quantum numbers. T
here is another quantum number called the spin quantum number, denoted by ms.
Let's see which of the given quantum number sets is possible.2, 1, 3 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. 5, 3, -3 is possible.4, 3, -2 is possible. -4, 3, 1 is not possible.
For any value of ℓ, mℓ must be between -ℓ and +ℓ. e. 2, 1, -2 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. f. 3, 2, 2 is not possible because for ℓ = 2, mℓ can only be -2, -1, 0, +1, or +2. g. 3, 3, 1 is not possible because for any value of ℓ, mℓ must be between -ℓ and +ℓ.
Therefore, the possible quantum numbers (ordered n, ℓ, mℓ ) are:5, 3, -34, 3, -2
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balance the equation
Answers
Answer: the balanced equation is
6KOH + Cl₂ ⇒ 5KCl + KClO₃ + 3H₂O
Explanation:
Given equation
KOH + Cl₂ ⇒ KCl + KClO₃ + H₂O
let us first balance Cl on the right-hand side
KOH + Cl₂ ⇒ 2KCl + KClO₃ + H₂O
next, lets balance K on the left-hand side
3KOH + Cl₂ ⇒ 2KCl + KClO₃ + H₂O
since we have H₂ on the right-hand side to equate H₂ we need to make the H coefficient even on the right-hand side so we multiply it by 2 so we get
6KOH + Cl₂ ⇒ 2KCl + KClO₃ + 3H₂O
now we balance K on the right-hand side
6KOH + Cl₂ ⇒ 5KCl + KClO₃ + 3H₂O
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