Final answer:
A single measurement cannot be considered precise as precision requires consistency across multiple measurements. However, a single measurement can be considered accurate if it closely matches the true or accepted value. Accuracy and precision are critical in scientific measurements for validity.
Explanation:
The concepts of accuracy and precision are fundamental in scientific measurements. When it comes to a single measurement being considered precise or accurate, context is essential. Precision refers to the consistency of repeated measurements. Therefore, one isolated measurement cannot be labeled as 'precise' without additional data to compare it to. However, a single measurement can be considered accurate if it is very close to the true or accepted value. For instance, if you measure a piece of standard computer paper and it states that it is 11.0 inches long, if you measure it once and obtain 11.1 inches, that single measurement can be considered quite accurate, assuming the stated length is correct.
Nevertheless, precision is really about the reproducibility of multiple measurements, and accuracy concerns how close a measurement is to the true or accepted reference value. For instance, if you have a series of measurements showing 11.1 in., 11.2 in., and 10.9 in., these could be considered both accurate and precise, as they are close to the true value of 11.0 inches and to each other. Conversely, a single measurement of 12 inches would be neither accurate (not close to 11.0 inches) nor precise if the rest of the measurements are significantly different from 12 inches.
How many hydrogen atoms are in each molecule of trisilylamine?
Answer:
9Explanation:
The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.
Ammonia is NH₃.
Then,
by substituting one hydrogen you obtain R - NH₂. by substituting two hydrogens you obtain R' - NH - R''by subsituting the three hydrogens you obtain:R'''
|
R' - N - R''
In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound trisilylamine is:
SiH₃
|
SiH₃ - N - SiH₃
Thus, you can count 3 hydrogen atoms for every silylgroup for a total of 9 hydrogen atoms in each molecule of trisilylamine.
Given that 4 nh3 + 5 o2 → 4 no + 6 h2o, when 4.50 mol of h2o are formed, the amount of no formed is 3.00 mol.
In the chemical reaction of NH3 with O2 that produces NO and H2O, the stoichiometric ratios are used to determine that 4.5 moles of H2O production results in the formation of 3 moles of NO.
Explanation:The question is referring to a chemical reaction, specifically a stoichiometric equation. The equation shows the reaction between ammonia (NH3) and oxygen (O2) to produce nitrogen monoxide (NO) and water (H2O).
According to the stoichiometric coefficients, which are the numbers in front of the molecules, for every 6 moles of water (H2O) formed, 4 moles of nitrogen monoxide (NO) are produced. To find how much NO is produced when only 4.5 moles of H2O are formed, we need to set up a proportion: 4 NO/6 H2O = x (moles of NO)/4.5 H2O. Solving for x gives us 3 moles of NO.
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The fe2+(aq) solution described in part a was produced by dissolving 4.05 g of ore in acid. what was the percentage of fe by mass in this ore sample?
Answer:
We can't solve this problem with that data.
Explanation:
Hi! Let's solve this!
To calculate the mass percentage, use (mass of Fe / total mass of ore) * 100
In this case we have the mass of Faith but the exercise does not have enough information to calculate the percentage.
We can't solve this problem with that data.
Are molecules packed most tightly together in a solid, liquid, gas, or plasma
A sample of propane, c3h8, contains 15.7 moles of carbon atoms. how many total moles of atoms does the sample contain?
Final answer:
To find the total moles of atoms in the propane sample, consider its molecular formula, with 3 carbon atoms and 8 hydrogen atoms.
Explanation:
The total moles of atoms in the propane sample can be calculated by considering the molecular formula of propane, C₃H₈.
Propane consists of 3 carbon atoms and 8 hydrogen atoms.
Therefore, in the given sample, there are a total of 3 x 15.7 moles of carbon atoms and 8 x 15.7 moles of hydrogen atoms.
O2 + ch4 co2 + h2o what would be the coefficient of the diatomic oxygen molecule in the balanced reaction?
a. 1
b. 2
c. 4
d. 6
Answer:
The coefficient of the diatomic oxygen has to be 2.Explanation:
The balanced reaction should be like this: [tex]2O_{2} + CH_{4} = CO_{2} + 2H_{2}O[/tex]
So, as you can see, balance mean that molecules in the reaction has to be equal, the amount of element involved has to be the same, due to the Conservation of the Mass Law.
So, Hydrogen and Oxygen are not balanced in the given expression, that's why we need to add those coefficients.
What is the molar ratio for the following equation after it has been properly balanced?
____C3H8 + ____O2 Imported Asset ____CO2 + ____ H2O
Reactants: C3H8 = 2, O2 = 5; Products: CO2 = 6 and H2O = 4
Reactants: C3H8 = 1, O2 = 5; Products: CO2 = 3 and H2O = 4
Reactants: C3H8 = 1, O2 = 8; Products: CO2 = 3 and H2O = 4
Reactants: C3H8 = 1, O2 = 5; Products: CO2 = 3 and H2O = 5
The correct option is b. The balanced chemical equation for the combustion of propane is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The molar ratio of the reactants and products is 1:5:3:4. Therefore, the correct option given is Reactants: C₃H₈ = 1, O₂ = 5; Products: CO₂ = 3, H₂O = 4.
The molar ratio for the combustion of propane (C₃H₈ ), we must first balance the chemical equation. The unbalanced equation is: C₃H₈ + O₂ → CO₂ + H₂O
Balancing carbon (C) atoms: C₃H₈ + O₂ → 3CO₂ + H₂O
Balancing hydrogen (H) atoms: C₃H₈ + O₂ → 3CO₂ + 4H₂O
Balancing oxygen (O) atoms: C₃H₈ + 5O₂ → 3CO2 + 4H₂O
Therefore, the balanced equation is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From this balanced equation, we see the molar ratio is: C₃H₈ : O₂ : CO₂ : H2O = 1 : 5 : 3 : 4
Thus, the correct choice is B : Reactants: C₃H₈ = 1, O₂= 5; Products: CO₂ = 3, H2O = 4
Write a detailed mechanism for the formation of ethyl acetate from ethanol and acetic acid with h2so4 as a catalyst?
What is the coefficient of mno2 when you balance the equation for this redox reaction? kcn(aq) + kmno4(aq) + h2o(l) → kcno(aq) + mno2(s) + koh(aq)?
A solution of sucrose in water has a boiling point that is _____ 100°C.
Answer:
greater than
Explanation:
just took it and yes i know someone already answered but i figred this would be quicker!!!!!!
The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is kc=2×1011 this means that the reaction mixture at equilibrium is likely to consist of
Final answer:
The equilibrium constant (Kc) of 2×10¹¹ndicates that at equilibrium, the concentration of carbon dioxide will be relatively high, while the concentrations of carbon monoxide and oxygen will be low.
Explanation:
The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc = 2×10¹¹. The equilibrium constant expression for this reaction is given by:
Kc = [CO₂] / ([CO]²[O₂]).
Based on the equilibrium constant value of 2×10¹¹, the reaction mixture at equilibrium is likely to consist of a relatively high concentration of carbon dioxide and low concentrations of carbon monoxide and oxygen.
Which of the following describes an element that is reduced in a reaction? It acts in the reactant that is the reducing agent. It has a decrease in its oxidation number. Cd yields Cd2+ + 2e− Zn + Cu2+ yields Zn2+ + Cu
Consider the incomplete reaction below.
NaOH + X mc005-1.jpg NaCH3COO + H2O
What is X in this reaction?
NH4OH
H3PO4
H2CO3
CH3COOH
What condition is often confused with the early stages of carbon monoxide poisoning boat ed?
Calculate the molar solubility of Ni(OH)2 in water. Use 2.0 * 10^-15 as the solubility product constant of Ni(OH)2.
Answer:
The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].
Explanation:
[tex]Ni(OH)_2\rightleftharpoons Ni^{2+}+2OH^-[/tex]
S 2S
Solubility of Nickel hydroxide =[tex]K_{sp}=2.0\times 10^{-15}[/tex]
[tex]K_{sp}=S\times 2S^{2}=4S^3[/tex]
[tex]2.0\times 10^{-15}=4S^3[/tex]
[tex] S=7.93\times10^{-6} mol/L[/tex]
The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].
why is a chemical indicator added to the flask in which a titration will occur?
Answer:
C
Explanation:
[07.02]what is the salt formed when magnesium hydroxide reacts with hydrochloric acid?
The balanced equation for the reaction is:
Mg(OH)2+ 2 HCl -------> MgCl2 + 2 H2OHow many sublevels are used with elements on the periodic table in energy level 5? (hint: when filling orbitals how many sublevels will have the designation of 5?)?
For energy level 5, there are five sublevels (s, p, d, f, and g).
In the periodic table, the energy level of an element is represented by the principal quantum number (n). Energy level 5 corresponds to the principal quantum number (n = 5). The sublevels within an energy level are represented by the azimuthal quantum number (l). The possible values of l range from 0 to (n - 1).
Therefore, for energy level 5 (n = 5), the possible values of l would be 0, 1, 2, 3, and 4.
Each value of l corresponds to a different sublevel designation:
l = 0: s-sublevel
l = 1: p-sublevel
l = 2: d-sublevel
l = 3: f-sublevel
l = 4: g-sublevel
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How many milliliters of a 1:2000 drug "i" solution and a 7% drug "i" solution mixed would make 120ml of a 3.5% solution of drug "i"?
To solve this problem, let us say that:
x = volume of 1:2000 drug "i" solution
y = volume of 7% drug "i" solution
Assuming volume additive, then this forms:
x + y = 120 mL
x = 120 – y ---> 1
1:2000 also refers to 0.0005 concentrations and 7% also refers to 0.07 concentrations. By doing a component balance:
0.0005 x + 0.07 y = 0.035 (120 mL)
0.0005 x + 0.07 y = 4.2
Substituting equation 1 into this derived equation to get an equation in terms of y:
0.0005 (120 – y) + 0.07 y = 4.2
0.06 – 0.0005 y + 0.07 y = 4.2
0.0695 y = 4.14
y = 59.568 mL = 59.57 mL
From equation 1, x would be:
x = 120 - 59.57
x = 60.43 mL
Answers:
59.57 mL of 1:2000 drug "i" solution
60.43 mL of 7% drug "i" solution
For elements to maintain a neutral charge, which two particles must have equal numbers?
Explanation:
An atom holds three sub-atomic particles and these are protons, neutrons and electrons.
Protons have a positive charge, neutrons have no charge and electrons have a negative charge.
Also, when an atom or element is neutral in nature then it means it contains same number of protons and electrons.
For example, sodium element is a neutral atom as it contains 11 protons and 11 electrons.
Thus, we can conclude that for elements to maintain a neutral charge, protons and electrons are the two particles that must have equal numbers.
the atomic number of boron is 5. what does this tell you about an atom of boron?
Boron is 5 in the periodic table of elements and the mass is rounded up 10 11. If the atomic number of boron is 5, that means that there would be 5 protons and 5 electrons.
A carbon atom is most likely to form what kind of bond(s) with other atoms? ionic bonds, covalent bonds, and hydrogen bonds covalent ionic hydrogen covalent bonds and hydrogen bonds
Answer: A carbon atom is most likely to form covalent bond(s) with other atoms.
Explanation:
Carbon atom is a group 14 element and its atomic number is 6. So, electronic distribution of carbon is 2, 4.
That is, it contains only 4 valence electrons. So, in order to attain stability it always needs to gain 4 more electrons by sharing its valence electrons with other atom.
Since, compounds formed due to sharing of electrons are known as covalent compounds.
Therefore, we can conclude that a carbon atom will always form covalent bond with other atoms.
A carbon atom is most likely to form covalent kind of bond with atoms. Therefore, the correct option is option B.
Two atoms sharing electron pairs form a type of chemical bond known as a covalent bond. Atoms in a molecule are joined by a powerful bond. In covalent bonds, electrons are often shared between nonmetal atoms in order to create a stable electron configuration. The two atoms are attracted to one another due to their common electron pair, which keeps them together in a molecule. The formation and stabilisation of molecules like water and methane depend heavily on covalent bonds.
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The primary anthropogenic source of atmospheric carbon dioxide (co2 ) is
A closed container is filled with oxygen. the pressure in the container is 225 kpa . what is the pressure in millimeters of mercury?
why N2 has a lower boiling point than CO?
N2 has a lower boiling point than CO because N2, being a nonpolar molecule, can't exhibit dipole-dipole attractions that CO, being a polar molecule, can. This results in weaker intermolecular forces in N2 than CO, hence a lower boiling point.
Explanation:The reason why N2 has a lower boiling point than CO is due to the different intermolecular forces they experience. Both CO and N2 are diatomic molecules with similar atomic masses, therefore, they experience similar London dispersion forces. However, the key difference is that CO is a polar molecule and thus, it experiences dipole-dipole attractions. On the other hand, N2 is a nonpolar molecule and therefore, can't exhibit dipole-dipole attractions. Hence, the dipole-dipole attractions in CO are stronger than the dispersion forces in N2, leading to a higher boiling point for CO.
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Which part of making a solution always releases energy?
a. separating the solvent particles from one another
b. mixing the solute and solvent particles
c. separating the solute particles from one another
d. the overall change in forming the solution
Energy is released in the making of a solution during the process of mixing the solute and solvent particles, characterizing it as an exothermic process.
Explanation:In the process of making a solution, specifically in Chemistry, energy is always released when mixing the solute and solvent particles. This process is also referred to as the exothermic process. In an exothermic process, the system (i.e., the solute and solvent) releases energy to its surroundings.
Think about when you dissolve salt in water. The salt particles, or solute, disperse among the water particles, or solvent, thus forming a solution. In this process, heat is often produced and released to the environment, signifying that energy is released during the dissolving process.
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A certain compound is made up of one phosphorus (P) atom, three chlorine (Cl) atoms, and one oxygen (O) atom. What is the chemical formula of this compound?
The chemical formula of that compound is POCl₃ and Its chemical name is phosphoryl chloride.
What is phosphoryl chloride?It is a chemical compound and its formula is POCl₃. It is manufactured industrially on a large scale from phosphorus trichloride and oxygen. It is a colorless liquid and has a pungent smell, Its molar mass is 153.33 grams per mole, its melting and boiling points are 274.4 K and 378.9 K respectively, it is soluble in water, and its molecular shape is tetrahedral. It is a reducing agent.
It is used in the making of semiconductors, plasticizers, hydraulic fluids, organophosphorus, and pesticides, and it is widely used as a chlorinating agent and dehydrating agent in laboratories.
Hence, the chemical formula of phosphoryl chloride is POCl₃.
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What is the ph of a 0.0075 m concentration of hydrochloric acid hcl? 0.50 1.1 2.1 3.2?
The pH of a 0.0075 M concentration of hydrochloric acid HCl equals 2.1, calculated using the formula pH = -log[H3O+].
Explanation:The pH of a solution can be determined using the formula pH = -log[H3O+]. In the case of a 0.0075 M concentration of hydrochloric acid (HCl), HCl is a strong acid and so it will ionize completely in water to form H+ (or H3O+) and Cl- ions. Since the concentration of H+ ions equals the initial concentration of the acid, we have [H3O+] = 0.0075 M. Applying the formula, we would find the pH = -log(0.0075) which equals roughly 2.1. This means that the pH of 0.0075 M HCl is 2.1.
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If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).) 0.10 g 10.0 g 12.0 g 57.7 g
Hello!
If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).
a) 0.10 g
b) 10.0 g
c) 12.0 g
d) 57.7 g
Data:
Q (Amount of heat) = 832 J
m (mass) = ?
c (Specific heat) = 0.90 J/(g × ° C)
T (final) = 97 ºC
To (initial) = 20 ºC
ΔT = T - To → ΔT = 97 - 20 → ΔT = 77 ºC
Formula:
Q = m*c*ΔT
Solving:
[tex]Q = m*c*\Delta{T}[/tex]
[tex]832 = m*0.90*77[/tex]
[tex]832 = 69.3\:m[/tex]
[tex]69.3\:m = 832[/tex]
[tex]m = \dfrac{832}{69.3}[/tex]
[tex]\boxed{\boxed{m \approx 12.00\:g}}\end{array}}\qquad\quad\checkmark[/tex]
Answer:
12.0 g
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What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? h+ + cl- + k+ + oh- → 2h+ + o2- + k+ + cl- h+ + cl- + k+ + oh- → h2o + k+ + cl- h+ + oh- → h2o none of the above 2h+ +2cl- + k2+ + 2oh- → h2o + k2+ +2 cl-?