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Related Questions
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Instructions
Balance each equation.Be sure to show off your lists! Remember you cannot add or place off coefficients in the middle of a chemical formula.
Example
2Na + MgF2 —-> 2NaF + 2Mg
Na= 2. Na=2
Mg= 1. Mg=1
F= 2. F=2
Answers
3. Cl₂ + 2KI --> 2KCl + I₂
Cl = 2 Cl = 2
K = 2 K = 2
I = 2 I = 2
4. 2NaCl --> 2Na + Cl₂
Na = 2 Na = 2
Cl = 2 Cl = 2
5. 4Na + O₂ --> 2Na₂O
Na = 4 Na = 4
O = 2 O = 2
6. 2Na + 2HCl --> H₂ + 2NaCl
Na = 2 Na = 2
H = 2 H = 2
Cl = 2 Cl = 2
7. 2K + Cl₂ --> 2KCl
K = 2 K = 2
Cl = 2 Cl = 2
What is the mass of 1.78 moles of O2
Answers
Answer:
56.96 grams
Explanation:
To find the mass of 1.78 moles of O2, we need to use the molar mass of O2, which is the mass of one mole of O2.
The chemical formula for O2 is O-O or simply O2. The molar mass of O2 is the sum of the atomic masses of two oxygen atoms, which can be found on the periodic table.
The atomic mass of oxygen (O) is approximately 16.00 g/mol. So the molar mass of O2 is:
Molar mass of O2 = 2 x atomic mass of O
= 2 x 16.00 g/mol
= 32.00 g/mol
Therefore, the mass of 1.78 moles of O2 is:
Mass = number of moles × molar mass
= 1.78 mol × 32.00 g/mol
= 56.96 g
So the mass of 1.78 moles of O2 is 56.96 grams.
Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds.
sulfate = SO42
phosphate = PO43
hydroxide OH-
sodium hydroxide
O Na(OH)2
O Na(OH)3
O Na₂OH
O NaOH
Answers
Answer:
D.) NaOH
Explanation:
Sodium always forms the cation, Na⁺.
Hydroxide is always written as OH⁻.
The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.
What did you include in your question? Check all that apply. examines the effect of mass examines the effect of different materials contains at least two variables
Answers
The sample response is : how do mass and the type of material affect thermal energy transfer?
So one need to have include the below factors in your answer:
Examines the effect of mass Examines the effect of different materialsContains at least two variablesWhat is the thermal energy transfer?The mass of an object influences allure thermal strength transfer traits. Generally, objects accompanying best public have greater warm strength depository volume.
They can absorb more heat strength before experience a meaningful change in hotness. If an equal amount of heat is used to both objects, the object accompanying better mass will demand more heat strength to raise allure temperature distinguished to the object accompanying tinier mass .
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. In this experiment, you need to examine the idea of the thermal energy transfer. Using a controlled experiment, what might a good question about the variables that affect thermal energy transfer be? Thermal energy transfer depends on many properties, be limit your question to only two. What did you include in your question?
c) Discuss precision and Accuracy as they relate to types of errors.
what is the answer
Answers
Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.
Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.
Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.
Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.
Errors in measurements can be classified into two types: random errors and systematic errors.
Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.
Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.
In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.
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During the synthesis of 2,4-dinitrophenylhydrazone derivative, you were instructed to triturate the crude product with 10 mL of 2 M hydrochloric acid. What is the purpose of this trituration
Answers
Answer:
to remove any remaining 2,4-dinitrophenylhydrazone
Explanation:
Usually, when an organic compound is synthesised, traces of impurities such as excess reagents or solvent remain in the product.
It is therefore imperative that these contaminants are removed so that the product can attain a very high degree of purity.
Hence, during the synthesis of 2,4-dinitrophenylhydrazone derivative, 10 mL of 2 M hydrochloric acid is titrated against the crude product so that any remaining 2,4-dinitrophenylhydrazone is removed.
Which of the following statements regarding energy is FALSE?
Energy is defined as the capacity to do work, or to put matter into motion
The products of exergonic reactions contain more potential energy than the reactants that form them
Increasing the temperature of atoms and molecules increases their kinetic energy
Exchange reactions allow chemical energy from one molecule to be transferred to another
Answers
Answer:
The correct answer is The products of exergonic reactions contain more potential energy than the reactants that form them.
Explanation:
It is considered false since the products in exothermic reactions have less energy than their reactants, since being exothermic they release energy in the form of heat to the environment that surrounds them.
An exothermic reaction gives energy to the environment that surrounds it at the end of the reaction, that is why the energy of the reactants will ALWAYS be greater than the final energy of the products, since as the reaction occurs, it loses energy and do not win.
The disorder and entropy in these reactions increases, complete combustion would be a clear example of exothermic reactions and their release of energy in the form of heat.
Exothermic reactions can be reversible or irreversible like all reactions.
calculate the number of moles in 1.0 × 10^21 atoms
Answers
Answer:
0.0017 mole
Explanation:
1 mole = 6.02 x 10^23 atoms
so the number of mole in 1.0 × 10^21 atoms is
(1.0 × 10^21)/(6.02 x 10^23) = 0.00166112956 or 0.0017 mole
CuI2 (light brown solid) name copper compounds
Answers
CuI2 is not a known compound. Copper compounds typically have different oxidation states for copper, resulting in various compound names.
Copper(II) oxide (CuO): It is a black solid compound where copper is in the +2 oxidation state. It is commonly used as a pigment and in catalytic reactions.
Copper(II) sulfate (CuSO4): It is a blue crystalline compound in which copper is in the +2 oxidation state. It is used in various applications such as agriculture, electroplating, and as a laboratory reagent.
Copper(I) oxide (Cu2O): It is a red crystalline compound in which copper is in the +1 oxidation state. It is used as a pigment, in solar cells, and as a catalyst.
Copper(II) chloride (CuCl2): It is a greenish-brown solid compound in which copper is in the +2 oxidation state. It is utilized in various chemical processes, including etching and catalyst synthesis.
Copper(II) nitrate (Cu(NO3)2): It is a blue crystalline compound where copper is in the +2 oxidation state. It is commonly used in the production of catalysts, as a coloring agent, and in electroplating.
These are just a few examples of copper compounds with different oxidation states and properties. It's important to note that the compound CuI2 mentioned in the question, if it exists, would be an exception to the typical nomenclature for copper compounds.
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We expect NaCl to have a lower melting point
than Nal since the smaller the ion (CI-¹), the
lower the bond energy (and the melting
point).
Select one:
True
Or False
Answers
It is false because NaCl has a higher bond energy than Nal.
What determines melting point?The melting point of a substance is determined by the strength of the intermolecular forces between its atoms or ions. In the case of NaCl, the strong electrostatic attraction between the positively charged Na+ ions and the negatively charged Cl- ions results in a relatively high melting point.
In contrast, NaI is a ionic compound with a lower bond energy between the atoms. So, it has lower melting point in comparision to NaCl. So the statement is False, NaCl has a higher melting point than NaI.
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What is the correct order for the first three steps of the scientific method?
A. State the question, conduct an experiment, form a hypothesis
B. Form a hypothesis, form a conclusion, conduct an experiment
C. Conduct an experiment, form a hypothesis, analyze the data
D. State the question, form a hypothesis, conduct an experiment
SUBMIT
Answers
Answer:
D.) State the question, form a hypothesis, conduct an experiment
Explanation:
https://www.colorincolorado.org/article/steps-scientific-process
A 150-lb patient is prescribed acetaminophen at 7.34 mg/kg. If acetaminophen is available on hand as a 0.125 mg/ml syrup, how many mililiters will the nurse administer?
Answers
Answer:
The nurse should administer 3995.2 millilitres of syrup.
Explanation:
The conversion factor of pound weight to kilogram is; 1 lb = 0.453592 kg
The body weight of the patient in Kg = 150 * 0.453592 = 68.04 kg
A prescription of 7.34 mg/kg acetaminophen means that he should receive;
7.34 mg * 68.04 = 499.4 mg of acetaminophen
Amount in grams of acetaminophen per millilitre of syrup = 0.125 mg
Number of millilitres of syrup required = 499.4 mg / 0.125 mg/mL = 3995.2 mL
Therefore, the nurse should administer 3995.2 millilitres of syrup.
The atomic number of an atom is equal to the number of protons electrons neutrons a.protons b.electrons c.neutrons
Answers
Answer:
A
Explanation:
Atomics number = number of protons
Select all that apply.
In two molecules of carbon dioxide (2CO2), there are _____.
two atoms of oxygen
two atoms of carbon
four atoms of carbon
four atoms of oxygen
Answers
Answer: In two molecules of carbon dioxide (2CO2), there are _____.
two atoms of carbon
four atoms of oxygen
Yolanda is focusing on eccentric contractions during her workout today. How is this MOST likely demonstrated in her workout?
Answers
Another way Yolanda may demonstrate eccentric contractions in her workout is by performing plyometric exercises that involve jumping and landing with control. These exercises require the muscles to lengthen eccentrically during the landing phase.
Finally, Yolanda may incorporate isometric holds into her workout, which require the muscles to maintain tension without changing length. Isometric holds can be used to target specific muscles and improve eccentric strength.
Overall, Yolanda's focus on eccentric contractions in her workout is likely demonstrated through exercises that emphasize slow and controlled lowering, plyometric exercises with an emphasis on landing with control, and isometric holds to improve eccentric strength.
Can someone please explain to me how to do these questions ?
Answers
The common logarithm by exponentiating all sides with base 10 we obtain [H+] = 10pH. In a solution with a pH near 2, the pOH is 12, the hydrogen ion concentration is 10-2 M, and the hydroxide ion concentration is 10-2 M.
If a solution's H+ content is 10 8, what is its pH?The negative logarithm of the hydrogen ion concentration is used to calculate the pH of a solution. Change the hydrogen ion's value in the equation above. Hence, the pH of [10 - 8] 6.98 M HCl solution.
What pH is a solution with such a 10–12 M H+ concentration?A solution with such a concentration of hydroxyl ions of 1012 M has a pH of 2. As the pOH is indeed the numerical expression of the OH- ion concentration, such a solution does have a pOH of 12. As the sum of the pH & pOH must equal 14, the pH must be 2.
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The compound butanol has the following structural formula.
A string of 4 C atoms are bonded above, left, and below to H. The right-hand end is bonded to O, which in turn is bonded to H.
Which of these is a structural isomer of butanol?
A string of 4 C atoms are bonded above, below, left and right to H.
A string of 4 C atoms is bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H.
A string of 4 C atoms is bonded above, below, left, and right to H, but the chain is interrupted between the first and second C, which are bonded to an O between them.
A string of 4 C atoms is bonded above, below, and left to H, except the last C has no H below and is double-bonded to an O to the right.
Answers
The structural formula of butanol is C4H9OH. It consists of a chain of four carbon atoms, with a hydroxyl (-OH) group attached to one of the carbon atoms. Butanol has several structural isomers, which have the same molecular formula but different structural formulas.
A structural isomer is a compound that has the same molecular formula as another compound but has a different arrangement of its atoms. A string of 4 C atoms are bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H is a structural isomer of butanol.
This is called butan-2-ol. The structural formula of butan-2-ol is CH3CH(OH)CH2CH3. In this isomer, the hydroxyl group is attached to the second carbon atom in the chain, whereas in butanol, the hydroxyl group is attached to the first carbon atom in the chain.
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Which daughter element is produced from the alpha decay of 213 over 85 At ?
A. 213 over 86 Rn
B.217 over 87 Fr
C. 213 over 84 Po
D. 209 over 83 Bi
Answers
Answer:
209
83 Bi
Explanation:
213 213 - 4 4
85 At = 85 - 2 Y + 2 He
A chemist adds a sample of an ideal gas to a balloon and measures its volume. The chemist removes some of the gas from the balloon and measures its volume again. If the chemist removes 21% of the gas from the balloon, and the pressure and temperature of the gas do not change, what happens to the volume of the balloon?
Answers
Answer:
The volume of the gas decreases also in a 21% based on the Avogadro's law
Explanation:
Based on Avogadro's law, the volume of a gas is directely proportional to the amount of moles of gas when temperature and pressure remain constants.
The formula is:
V1 / n1 = V2 / n2
Where V is volume and n are moles in 1, initial state and 2, final state of the gas.
At beginning, V1 = 100%, n1 = 100%,
As the chemist removes 21% of the gas, 79% of moles remain = n2.
Replacing:
100% / 100% = V2 / 79%
V2 = 79%, that means:
The volume of the gas decreases also in a 21% based on the Avogadro's lawwrite the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answers
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
Which is most likely to happen during a double-displacement reaction?
O A. Two substances will combine to form one compound.
B. The ions in two compounds will switch places to form two new
compounds.
C. An element will replace another element in a compound.
D. A compound will break apart into two or more substances
Answers
I think the Answer is B
In a double-displacement reaction, the cations and anions switch places to produce the product. The ions swap their place to yield new compounds. Thus, option B is correct.
What is a double-displacement reaction?A double-displacement reaction, also called salt metathesis reaction is a process involving the exchange of the bonds and the positive and the negative ions to result in compounds different from the reactant.
The positively charged cation and the negatively charged anion swap their places and produce new products or compounds. It can be of three types namely neutralization, precipitation, and gas formation.
Therefore, the ions (cations and anions) switch their places in a double-displacement reaction.
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Think about how you could design a robot to propel itself across an ice rink by applying the same principles that cause rockets to move. Describe what materials you would use and how the robot would work. What are some material limitations that you would need to consider for a robot moving on ice?
please help
Answers
Answer:
To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.
Explanation:
The robot would work by using a propulsion system to generate a force that propels it forward. This could be achieved using a variety of methods, such as by using a jet engine or a rocket engine to produce a stream of hot gases that exits through a nozzle, creating a thrust force in the opposite direction.One material limitation to consider when designing a robot that moves on ice is the coefficient of friction between the robot's surface and the ice. A material with a low coefficient of friction, such as rubber or plastic, would be better suited for movement on ice, as it would provide less resistance and allow the robot to move more easily. In contrast, a material with a high coefficient of friction, such as steel, would be more difficult to move on ice, as it would generate more resistance and require more force to overcome.Other material limitations to consider when designing a robot for movement on ice might include the robot's weight and shape, as well as the overall stability and balance of the robot. It would also be important to consider the durability and wear resistance of the materials used, as the robot may need to withstand repeated movement on the ice over time.Answer:
Explanation:
Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided
If He atoms (mass 4), Ne atoms
(10), Ar atoms (40) and Kr atoms
(84) at the same temperature, what is true about their average kinetic energy?
A) He has the highest KE
B) Ar has the highest KE
C) Kr has the highest KE
D) They all have the same KE
Answers
If He atoms (mass 4), Ne atoms(10), Ar atoms (40) and Kr atoms
(84) at the same temperature, the true about their average kinetic energy is: D) They all have the same KE.
What is true about their average kinetic energy?This is due to the fact that temperature serves as a proxy for the average kinetic energy of the gas molecules. All gas molecules have the same average kinetic energy at a given temperature, which is proportional to the temperature in kelvin.
Because the velocity of each molecule is inversely proportional to its mass, the more massive molecules move slower and the less massive molecules move faster, but their average kinetic energies are equal even though different gas molecules have different masses.
Therefore the correct option is D.
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When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
a chemical change, because a precipitate is being formed
a chemical change, because a gas is being formed
a non chemical change, because a precipitate is being formed
a non-chemical change, because a gas is being formed
Answers
Answer: B
a chemical change, because a gas is being formed
Explanation:
Answer:
B
Mark Brainliest please
Explanation:
which water boils can be related to the weather.
Answers
Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
Which water boils can be related to the weather?Water boils quickly when the weather is hot and warm because hot weather has high temperature which leads to the quick evaporation of the water. In hot weather, the liquid water changes into vapor state very quickly as compared to cold temperature.
So we can conclude that Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
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According to the ,cell theory where do cells come from?
Answers
Answer:
cells come from pre existing cells
1. What is the modern view of electrons in the quantum mechanical model?
Answers
Answer: An electron con only exist in a limited number of quantized energy levels.
Explanation:
5. The gases in a hair spray can are at a temperature of 37 °cand a pressure of 5.6 atm. If the gases in the can reach apressure of 4.4 atm, the can will explode. To what temperaturemust the gases be raised in order for the can to explode? (Donot try this at home)
Answers
Answer
243.69 K
Explanation
Given:
Initial temperature, T₁ = 37 °C = (37 + 273.15 K) = 310.15 K
Initial pressure, P₁ = 5.6 atm
Final pressure, P₂ = 4.4 atm
What to find:
The temperature to which the gases must be raised in order for the can to explode.
Step-by-step solution:
According to Amonton's Law, it states that the pressure of an ideal gas varies directly with the absolute temperature when the volume of the sample is held constant.
The final temperature of the gas can be calculated using Amonton's law formula given by
\(\frac{P_1}{T_1}=\frac{P_2}{T_2}\)Putting the values of the given parameters into the equation:
\(\begin{gathered} \frac{5.6atm}{310.15K}=\frac{4.4atm}{T_2} \\ \\ T_2=\frac{4.4atm\times310.15K}{5.6atm} \\ \\ T_2=243.69\text{ }K \end{gathered}\)The temperature to which the gases must be raised in order for the can to explode is 243.69 K
What is the concentration of the following:
2.0mol of zinc sulphate in 10 dm^3 of solution
Answers
Answer:
Concentration is measured in moles per cubic decimetre: mol dm–3. To find the concentration of a solution, divide the number of moles by the volume in dm3. If the volume is in cm3, divide the volume by 1000 first to convert it into dm3.
Explanation:
Which statement gives a disadvantage of multicellular organisms?
A. They need small amounts of energy
B. They reproduce slower than unicellular organisms
C. They can perform more functions
D. Cells are able to provide support
Answers
Answer: B. They reproduce slower than unicellular organisms
Explanation:
In unicellular organisms there is a single cell which performs all the functions like digestion, respiration, and reproduction. The cell reproduce by cell division. The single parent cell divides into two identical daughter cells. But multicellular organisms exhibit multiple cells and their reproduction is complex. They reproduce by sexual mode of reproduction in which separate sex cells are produced when they fuse form zygote which is the precursor of new organism. This process is slower than that of the cell division and production of progeny by the unicellular organisms. Thus reproduction is slower in multicellular organism this is the disadvantage in multicellular organisms.
Answer:
B. they reproduce slower than unicellular organisms
Explanation: