If the average velocity of an object is not the same for all time intervals, then the object moves at a(n)
Answers
Answer:
A
Explanation:
because the object's velocity had no acceleration between time intervals
Related Questions
A. what color represents the bonds between the particles of nac2h3o2? b. click play. watch the animation a few times. what happens to the nac2h3o2 bonds? c. what happens to the bonds between water molecules? d. what color are the new bonds that form between the solute and solvent?
Answers
a. The color representing the bonds between the particles of NaC₂H₃O₂ is not specified in the given question.
b. Watching the animation multiple times will help observe what happens to the bonds of NaC₂H₃O₂.
c. The question does not provide information about what happens to the bonds between water molecules.
d. The question does not specify the color of the new bonds formed between the solute and solvent.
a. The color representing the bonds between the particles of NaC₂H₃O₂ is not provided in the question. The color of the bonds can vary depending on the representation used in the specific context of the animation or experiment being referred to.
b. Watching the animation multiple times allows for careful observation of what happens to the bonds of NaC₂H₃O₂. The animation might depict the breaking of bonds between the sodium cations (Na+) and the acetate anions (C₂H₃O₂₋) as the solute dissolves or interacts with the solvent.
c. The question does not provide information about what happens to the bonds between water molecules. However, in general, water molecules form hydrogen bonds with each other due to the polarity of the water molecule. These hydrogen bonds contribute to the unique properties of water, such as its high boiling point and surface tension.
d. The question does not specify the color of the new bonds that form between the solute (NaC₂H₃O₂) and the solvent. The color of the bonds formed between the solute and solvent is not a defining characteristic and can vary depending on the specific context or representation being used.
It is important to note that the given question lacks specific details or context regarding the colors and changes in bonds. Further information or clarification would be necessary to provide a more accurate and detailed response.
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Write an equation that represents the second ionization energy of nickel.
Answers
The equation that represents the second ionization energy of nickel is \(\rm Ni+ (g) \rightarrow Ni^2^+ (g) + e-.\)
What is the second ionization energy?The energy needed to free the outermost, or least bound, an electron from an element's 1+ ion is known as the second ionization energy.
The second ionization energy of an element is usually greater than the first because positive charge more strongly attracts electrons than negative charge.
The chemical equation is the representation of the chemical reaction. The left side of the substance and compound is the reactant and the right side of the substance is the product.
Nickel is a chemical element. Its chemical symbol is Ni. Its atomic number is 28. It's a silvery luster metal.
Therefore, the equation is \(\rm Ni+ (g) \rightarrow Ni^2^+ (g) + e-.\)
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In the liquid, there are hydrogen bonds that form between molecules of water and covalent bonds that form between hydrogen and oxygen within a water molecule. Which statement(s) are true about When water is boiling, which statement(s) are true?
a) The covalent bonds between hydrogen and oxygen are broken.
b) The hydrogen bonds between water molecules are broken.
c) both are true
d) neither are true
Answers
Answer:
c
Explanation:
The mass of one methane molecule is 2.7×10⁻²³ gram. Find the mass of 50,000 molecules of methane. Express the answer in scientific notation. The mass of 50,000 molecules of methane is gram. (Use the multiplication symbol in the math palette as needed.)
Answers
The mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.
To find the mass of 50,000 molecules of methane, we need to multiply the mass of one methane molecule by the number of molecules.
Given:
Mass of one methane molecule = 2.7 × 10⁻²³ gram
Number of methane molecules = 50,000
To calculate the mass of 50,000 molecules of methane, we can use the following equation:
Mass = (Mass of one molecule) × (Number of molecules)
Mass = (2.7 × 10⁻²³ gram) × (50,000)
Now, let's calculate the mass:
Mass = 2.7 × 10⁻²³ × 50,000
Mass = 1.35 × 10⁻¹⁸ gram
Therefore, the mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.
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chemical analysis of an organic compound found the following composition: 40.0% c, 53.5% o, and 6.7% h. if the molar mass is 180.2 g/mol, how many empirical formula units are there in the molecular formula?
Answers
Empirical formula units is 2 and the molecular formula is CxHyOz.
Molar mass-The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.Calculate the molar mass of a substance by adding the molar masses of its constituent atoms.
There are 40.0 in 100 g of the unknown.
40.0⋅g/12.011⋅g⋅mol−1C
6.7⋅g/1.00794⋅g⋅mol−1 H and
53.5⋅g/16.00gmol−1
We divide by to get C : H : O.
=3.33:6.65:3.34
. We get an empirical formula of C H 2 O by dividing each elemental ratio by the LOWEST number, which is close enough to WHOLE numbers.
Now the molecular formula is always a multiple of the empirical formula; i.e.
(EF)n=MF.
So 60.0⋅g.mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.
Clearly n=2, and the molecular formula is×(CH2O) =CxHyOz.
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MULTIPLE CHOICE QUESTION
Which distance-time graph most
accurately represents the data in the
data table?
Answers
Answer:
(a) The slope of distance-time graph gives the speed of the objects.
As the slope of object (B) is the greatest among all, thus B has the largest speed and hence it is the fastest among all the objects.
(b) : As the curve of the objects do not intersect with each other even once, hence they cannot be at the same point on the road at the same time.
(c) : On the y axis (i.e. distance line), 7 small represents 4 km
∴ 1 small line =
7
4
=0.57 km
Position of C at the instant B passes A is 8 km
(d) ; Position of B at the instant it passes C is 2nd small line above 4 km i.e. 4+2×0.57=5.14 km
∴ Distance traveled by B =5.14−0=5.14 kmV
Explanation:
Indicate which one of the following reactions results in a negative ΔS.A. H2O(g) óH2O(s)B. CaCO3(s) ó CaO(s) + CO2(g)C. CuSO4(H2O)5 (s) óCuSO4(s) + 5H2O(g)D. 14O2(g) + 3NH4NO3(s) + C10H22(l) ó 3N2(g) + 17H2O(g) + 10CO2(g)E. CO2(aq) ó CO2(g)
Answers
The reaction that results in a negative ΔS is option E. CO2(aq) ó CO2(g)
ΔS is the change in entropy of a system, which is a measure of the randomness or disorder of the system. A negative ΔS means that the system has become more ordered. In this case, when CO2(aq) turns into CO2(g), the molecules become more ordered as they are transitioning from a solution to a gas. Therefore, this reaction results in a negative ΔS.
In contrast, options A, B, C, and D all involve either a solid turning into a liquid or gas, or multiple reactants forming a mixture. These changes result in an increase in disorder and randomness, which leads to a positive ΔS. The reaction that results in a negative ΔS is: A. H2O(g) → H2O(s). A negative ΔS means a decrease in entropy, which occurs when a system becomes more ordered. In the given reactions, A. H2O(g) → H2O(s) involves the transition from the gaseous state to the solid state, leading to a more ordered system.
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What is mass number definition in chemistry?
Answers
The mass number is a fundamental property of an atom that describes the total number of protons and neutrons present in the nucleus of an atom.
The mass number is represented by the symbol A, and it is equal to the sum of the number of protons and neutrons in an atom. For example, the mass number of carbon-12 is 12, which means it has 6 protons and 6 neutrons in its nucleus.
It is important to note that the mass number is different from the atomic number, which is the number of protons in an atom. The atomic number is represented by the symbol Z, and it determines the chemical properties of an element.
The mass number can also be used to distinguish between different isotopes of an element. Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, they have different mass numbers. For example, carbon-12 and carbon-14 are isotopes of carbon and they have different mass numbers.
In summary, mass number is the total number of protons and neutrons present in the nucleus of an atom, represented by the symbol A. It is different from the atomic number which is the number of protons in an atom and represented by the symbol Z. The mass number is also used to distinguish between different isotopes of an element.
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what is a covalent and ionic bond
Answers
Answer:
Covalent bonding involves the sharing of electrons between two or more atoms. Ionic bonds form when two or more ions come together and are held together by charge differences.
Answer:
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
Ionic bond refers to a type of chemical bond which generates two oppositely charged ions. This bonding refers to the complete transfer of valence electrons between atoms
( Refer the attached image for their respective examples )
how many moles of nitrogen gas would be produced if 4.77 moles of copper(ii) oxide were reacted with excess ammonia in the following chemical reaction?
Answers
The chemical reaction is as follows:3CuO + 2NH3 → 3Cu + N2 + 3H2OGiven that 4.77 moles of copper(II) oxide reacts with excess ammonia. Therefore, the number of moles of nitrogen gas produced would be the main answer of the question.
To find out the number of moles of nitrogen gas produced, we first need to determine the limiting reactant in the given reaction. Limiting reactantThe limiting reactant is the reactant that is completely consumed during the chemical reaction. The other reactant will be in excess, and any unused quantity of that reactant will be left over when the reaction is complete. The stoichiometric ratio of CuO to NH3 is 3:2. Thus, the moles of ammonia required to react with 4.77 moles of CuO can be calculated as follows: Number of moles of NH3 = (4.77 moles CuO) × (2/3) = 3.18 moles NH3The given reaction requires 2 moles of NH3 to produce 1 mole of N2.
Thus, the number of moles of nitrogen gas produced is:1/2 × 3.18 mol NH3 = 1.59 moles of N2Therefore, the main answer of the question is 1.59 moles of nitrogen gas produced.:We have to calculate the moles of nitrogen gas produced when 4.77 moles of CuO reacts with an excess of ammonia. The balanced chemical equation is given below;3CuO + 2NH3 → 3Cu + N2 + 3H2OWe can see from the equation that 2 moles of NH3 produce 1 mole of N2.So, the number of moles of NH3 that reacted = 4.77 × (2/3) = 3.18 miles according to the balanced chemical equation,3 moles of CuO react with 2 moles of NH3 to give 1 mole of N2.So, 4.77 moles of CuO reacts with (2/3)×4.77 = 3.18 moles of NH3 to give = (1/2)×3.18 = 1.59 moles of N2.Therefore, the main answer to the question is 1.59 moles of N2.
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Silver nitrate and sodium phosphate are reacted in equal amounts of 200 g each. How many grams of silver phosphate are produced?
Answers
Answer:
The answer is "164.2726 g "
Explanation:
Equation:
The molar weight of
The mol in
The molar weight of
The moles in
The ratio in the equation is 3:1 so, limits reaction the ratio is 3:1 therefore, 0.392456 mol of were reacted
The molar mass of the
\(mass= mol \times Molar \ Weight\)
\(= 418.576 \times 0.392456 \\\\= 164.2726 \ g \ of \ Ag_3PO_4\)
The molar mass of ammonium acetate is 77.083 g/mol. A student uses 0.100 mol of ammonium acetate in a chemical reaction. The
student claims that the reaction uses (0.100 mol) (77.083 g/mol) = 7.71 g of ammonium acetate, which has
(7.71) (6.022 x 1023) = 4.64 x 1024 molecules.
In one to two sentences, explain the mistake that the student made and determine the correct number of molecules of ammonium
acetate used in the reaction.
Answers
The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.
The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.
To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.
Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:
Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)
Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.
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which of these is important to gathering and interpreting scientific information?
A.) Logic
B.) Emotion
C.) Legend
D.)Religion
Answers
Answer:
A. Logic
Explanation:
Answer:
Logic. When interepreting scientific information you have to always use logic
Explanation:
a 20.00-ml sample of 0.150 m nh3 is being titrated with 0.200 m hcl. what is the ph after 15.00 ml of hcl has been added? kb of nh3
Answers
8.96 is the pH after 15.00 ml of hcl has been added.
What is pH?
The H+ ion concentration's negative logarithm is known as pH
We are aware that not every acid or base reacts with a chemical substance at the same pace. Other people respond extremely strongly, some people mildly, and some people don't react at all. We utilise a universal indicator that exhibits various colours at various concentrations of hydrogen ions in solution to objectively assess the strength of acids and bases
0 mL of NaOH has not been added, leaving a pH of 2.32.
Only HCOOH is present in the solution prior to the addition of any NaOH. The balance of the HCOOH in solution controls pH.
Ka = HCOO- concentration times H3O+ concentration divided by HCOOH concentration
8.96 is the pH after 15.00 ml of hcl has been added.
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5 points
The density of a 30 cm long copper pipe is 8.96g/cm3. You need to cut the copper pipe into 4 equal pieces. What will be the density of each of the 4 smaller pieces of copper pipe? (density = mass/volume)
Answers
\(\\ \sf\bull\longmapsto Density\propto \dfrac{1}{Volume}\)
Hence it has been cut into 4pieces
\(\\ \sf\bull\longmapsto Density=4(8.96)\)
\(\\ \sf\bull\longmapsto Density=35.84g/cm^3\)
How many moles of sodium cyanide (NaCN) would be needed to produce 4.2 moles of sodium sulfate (Na2SO4)? ANSWER FAST PLS.
Answers
8.4 moles of sodium cyanide (NaCN) needed to produce 4.2 moles of sodium sulfate (Na₂SO₄).
To determine the number of moles of sodium cyanide (NaCN) needed to produce 4.2 moles of sodium sulfate (Na₂SO₄), we need to first balance the chemical equation for the reaction between NaCN and Na₂SO₄. The balanced equation is:
2 NaCN + Na₂SO₄ → Na₂S₂O₃ + 2 NaOH
From the balanced equation, we can see that 2 moles of NaCN are needed to produce 1 mole of Na₂SO₄. Therefore, to produce 4.2 moles of Na₂SO₄, we need to use:
4.2 moles Na₂SO₄× 2 moles NaCN/1 mole Na₂SO₄ = 8.4 moles NaCN
So, we need 8.4 moles of NaCN to produce 4.2 moles of Na₂SO₄. This calculation is based on the stoichiometry of the balanced chemical equation.
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a)1.5 km + 4.32 km
b) 4.6 cm x 1.586 cm
Answers
Answer:
a. 5.82km
b. 7.2956cm
Explanation:
Which statements accurately describe volume? Check all that apply.
1. Volume is a physical property of an object.
2. Volume is measured using a balance.
3. The volume of a solid changes with the shape of the container.
4. One unit of volume is the milliliter.
5. Liquids and solids have constant volume.
Answers
Answer:
the answer is the number three
Answer: the right answer is 1,4&5
How many moles of aluminum are present in an Al cylinder with a mass of 15 g? A 0.42 mole B.0.65 mole C.0.56 mole D.0.24 mole E:None of the above
Answers
The number of moles of aluminum present in an Al cylinder with a mass of 15 g is C. 0.56 moles
To find the number of moles of aluminum present in an Al cylinder with a mass of 15 g, you can use the formula:
Number of moles = mass / molar mass
The molar mass of aluminum is 26.98 g/mol. Therefore, you can plug in the given values into the formula to find the number of moles:
Number of moles = 15 g / 26.98 g/mol
Number of moles = 0.556 moles ≅ 0.56 moles
Therefore, the correct answer is C. 056 moles of Aluminum.
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1. Each bag of flour is 8.9 grams. What is the weight of 4 bag of flour?
Answers
Answer:
8.9g×4=35.6g
Explanation:
follow please
How do spores help the survival of spore-bearing plant?
Answers
Answer:
When weather conditions are ideal, some ferns, algae, moss,and even fungi, release spores into the air, often carried by the wind, by insects or birds until they land. Spores contain both male and female reproductive organs, which allows these plants to replicate themselves in a form of cloning.
Explanation:
Which of the following is an example of a heterogeneous mixture?
salad
milk
paint
toothpaste
Answers
Answer:
salad
Explanation:
2 reasons for chemical reactivity of nitrogen
Answers
Answer:
Due to presence of a triple bond between the two N−atoms, the bond dissociation enthalpy (941.4 kJ mol
−1
) is very high. Hence, N
2
is the least reactive.
A solution is 2.00 x 10-3 M Ba(NO3)2 and 0.0500 M KF. Given that the Kspof barium fluoride is 1.5 x 10-6,
A. Qsp = 5 x 10-6 so a precipitate will be observed.
B. Qsp = 1 x 10-6 so no precipitate will be observed
C. Qsp = 1 x 10-4 so a precipitate will be observed.
D. Qsp = 2 x 10-4 so a precipitate will be observed.
E. Qsp = 2 x 10-5 so a precipitate will be observed.
Answers
The correct answer is B. Qsp = 1 x 10-6 so no precipitate will be observed. To determine if a precipitate will form, we need to calculate the ion product (Qsp) of barium fluoride in the solution and compare it to the solubility product (Ksp).
\(Ba(NO_{3})_{2}\) dissociates into \(Ba_{2+}\) and \(2NO_{3-}\) ions. KF dissociates into K+ and F- ions. The balanced equation for the reaction that could form a precipitate is: \(BaF_{2}\) ⇌ \(Ba_{2+}\)(aq) + 2F-(aq).
The concentration of \(Ba_{2+}\) ions is equal to twice the initial concentration of \(Ba(NO_{3})_{2}\), or 4.00 x 10-3 M. The concentration of F- ions is equal to the initial concentration of KF, or 0.0500 M.
The ion product (Qsp) is the product of the ion concentrations raised to their respective coefficients in the balanced equation: Qsp = \(Ba_{2+}\)[F-]2 = (4.00 x 10-3)(0.0500)2 = 1.00 x 10-5.
Comparing Qsp to Ksp, we have: Qsp = 1.00 x 10-5 < Ksp = 1.5 x 10-6. Since Qsp is less than Ksp, no precipitate will form. The correct answer is B. Qsp = 1 x 10-6 so no precipitate will be observed.
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Convert 7g/dm^3 of H2O to mol/dm^3
Answers
Conversion of 7g/dm³ of H₂O to 0.21 mol/dm³ is
Conversion is the act or process of changing something into a different state or form
Here given data is
7g/dm³ of H₂O we have to convert it into mol/dm³ = ?
Then divide by the relative formula mass
We get H₂O then H = 1 here 2 hydrogen = 1×2 = 2 and 1 oxygen i.e 1×16 = 16 =
2×16 = 32
So, 7g/dm³/32
= 0.21 mol/dm³
7g/dm³ of H₂O to 0.21 mol/dm³
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Which of the following would you expect to see written as separated ions in an ionic equation?
H2(g)
H2O(l)
H2S(g)
HCl(aq)
Answers
HCl(aq) would be expected to see written as separated ions in an ionic equation.
When HCl is dissolved in water, it ionizes completely to form H+ and Cl- ions, which are free to move around in solution. Therefore, in an ionic equation, HCl(aq) would be written as H+(aq) + Cl-(aq).
In contrast, H2(g), H2O(l), and H2S(g) are covalent compounds that do not ionize in water, so they would not be written as separated ions in an ionic equation.
Using dobereiner's triads, what conclusion could have been made about magnesium
Answers
Answer:
Triads were groups of 3 elements with similar chemical and physical properties. Beryllium, magnesium, and calcium are all earth alkalis found in the earth
Explanation:
What is percent composition by mass?
Answers
Percent composition indicates the relative amounts of each element in a compound. For each element, the mass percent formula is: % mass = (mass of element in 1 mole of the compound) / (molar mass of the compound) x 100% or. mass percent = (mass of solute / mass of solution) x 100%.
4. In order from smallest to largest, rank the following soil components in terms of their contribution per unit mass to the negative electrical charge of the soil: kaolinite, smectite, organic matter, Fe and Al oxides. For each material, indicate if the load provided is permanent or pH-dependent.
Answers
The following soil components ranked in order from smallest to largest contribution per unit mass to the negative electrical charge of the soil are: Fe and Al oxides, organic matter, kaolinite, and smectite.
The negative electrical charge of the soil comes from the soil's clay and organic matter components. Soil particles, such as clay minerals and organic matter, provide a negative charge. The pH-dependent charge comes from the acidity of the soil. The degree of acidity is measured on a scale of 1 to 14, with 7 being neutral.
The lower the pH level, the more acidic the soil. A pH level of 6.5 to 7.5 is optimal for most plants. The following soil components are ranked in order from smallest to largest contribution per unit mass to the negative electrical charge of the soil: Fe and Al oxides, organic matter, kaolinite, and smectite. Fe and Al oxides provide a permanent load.
Organic matter provides both a permanent and pH-dependent charge. Kaolinite provides a pH-dependent charge. Smectite provides a pH-dependent charge.
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According to the law of entropy, when hot and cold objects meet, heat flows from hotter to colder. What would be the end result of mixing hot water and cold water?
Responses
A.The molecules in the cold water would slow down.The molecules in the cold water would slow down.
B.The cold water would continue to heat up.The cold water would continue to heat up.
C.All the water would reach an equilibrium temperature and heat would stop flowing.All the water would reach an equilibrium temperature and heat would stop flowing.
D.The two volumes of water would balance out but the temperature of the two would keep fluctuating.The two volumes of water would balance out but the temperature of the two would keep fluctuating.
E.The warm water would continue to cool down.
Answers
C. All the water would reach an equilibrium temperature and heat would stop flowing.
When hot and cold water are mixed together, heat flows from hotter to colder until both reach a common temperature. This is because the molecules in the hotter water have more kinetic energy than those in the colder water, and so they transfer some of their energy to the colder water until both have the same amount of energy. Eventually, all the water in the mixture will reach the same temperature, and heat transfer will stop. Therefore, the end result of mixing hot and cold water would be that all the water would reach an equilibrium temperature and heat would stop flowing.
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