Answer:
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A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper
Answer:
Explanation:
pure chemical substances and element.
All elements are pure. If this sample of copper had been impure, we would call it a mixture, not an element.
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system?
A) The concentrations of the reactants and products increase.
B) The concentrations of the reactants and products remain constant
C) The rate of the forward reaction is faster than the rate of the reverse reaction.
D) The rate of the forward reaction is slower than the rate of the reverse reaction
Answer: B
Explanation:
At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and thus the concentrations of the reactants and products must be constant.
ii. If the pressure after landing was 1.0 atm, what was the volume of the passenger's collapsed water bottle? (Assume the bottle collapsed easily and temperature didn't change.) (6 points)
Using the ideal gas equation and Gay Lussac's law, the volume of the passenger's collapsed bottle after landing is 0.0075 L.
What is ideal gas equation?The ideal gas equation shows the relationship between temperature, pressure, volume and number of moles.
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Given that;
PV = nRT
P = gas pressureV = volume of gasn = number of moles of gasR = molar gas constantT = temperaturen = PV/RT
Hence:
P = 0.75 atm;
V = 0.5 L;
T = 295 K;
R = 0.082 atmL/K.mol
n = 0.75 * 0.5 / 0.082 * 295
n = 0.015 moles
If the pressure after landing was 1.0 atm;
V1n1 = V2n2
V2= V1n1/n2
V2 = 0.5 L * 0.015 moles/ 1 mole
V2 = 0.0075 L
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Missing parts;
A passenger on an airplane finished a 0.5 L bottle of water during the flight
and replaced the lid. The cabin pressure and temperature were maintained at
0.75 atm and 295 K during the flight. After landing, he noticed his empty water
bottle had collapsed. (12 points)
i. How many moles of gas were in the water bottle?
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The densities of copper, silver, iron, and magnesium are in that order. You are given grams of each metal. Which one has the largest volume
Density is the ratio of mass to volume. The substance with the lowest density has the largest volume. The volume of magnesium will be the largest.
What is density?Density is the mass per volume of the substance. It is denoted by the Latin letter rho (ρ) or D. It is the division of the mass in kilograms to the volume in cubic meters.
The relation of the density is inversely proportional to the volume and when the order is given in increasing order of density then magnesium will have the largest volume as it has the least density.
Therefore, magnesium has the largest volume.
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Based on log rules and the way ph is calculated, what is the difference in [oh– ] concentration between point a and point b. 101 105 106 107
Based on their pOH values, the difference in [OH– ] concentration between point A and point B is 10^6.
What is pH of a substance?The pH is determined by the concentration of Hydrogen ions [H+]. The higher the concentration of H+ ions, the lower the pH of a substance. If the concentration of H+ is greater than OH-, the material is acidic, i.e. the pH value is less than 7
In this case, the formula for this will be:
[tex]pH= -log[H+][/tex]
So we have:
[tex][OH]= 14-1= 10^{-13}\\[OH] = 14-7=10^{-7}[/tex]
Therefore, the difference in [OH– ] concentration between point A and point B is 10^6.
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Answer: 10^6
Explanation: edge2023
Two different shaped containers have the same pressure, temperature and volume. What else must be true?
Answer:
n, the number of moles of gas is the same
Explanation:
PV = n RT if P and V and T and R are the same , the n must be the same
n = numer of moles
A telescope would be MOST useful in answering which question? . O How do rockets move in space? What shape is a human skin cell? O What is on the surface of the Moon? O How do worms breathe underground?
Answer:
what is on the surface of the moon.
Explanation:
What would the total surface area be if our large cube were divided into 8000 cubes with each side having a length of 1 cm?
48,000 cm2
8000 cm2
36,000 cm2
96 cm2
Answer:
48 000 cm^2
Explanation:
8000 1cm cubes
each 1 cm cube side is 1 cm^2 and there are six sides to the cube , so each cube has 6 cm^2 surface area
and there are 8000 of them 8000 * 6 cm^2 = 48 000 cm^2
What type of reaction is illustrated?
C + 2F2 → CF4
Answer:
Synthesis Reaction
Explanation:
An synthesis reaction is one in which two or more atoms/molecules react to create a different molecule. These reactions follow the general structure: A + B --> AB.
More specifically, this is an addition reaction. An addition reaction occurs when two or more atoms/molecules combine to create a larger molecule. In this case, carbon and fluorine react to form carbon tetrafluoride, a larger molecule consisting of all the reactants.
This is not a decomposition reaction because these reactions involve a molecule breaking down into atoms or simpler molecules. These reactions follow the general structure: AB --> A + B.
This is not a single-replacement reaction because these reactions involve atoms replacing atoms of a different element in a compound. These reactions follow the general structure: A + BX --> B + AX.
What is the approximate tangential speed of an object orbiting earth with a radius of 1.8 × 108 m and a period of 2.2 × 104 s? 7.7 × 10–4 m/s 5.1 × 104 m/s 7.7 × 104 m/s 5.1 × 105 m/s
This question involves the concepts of time period and tangential speed.
The tangential speed of the object is "5.1 x 10⁴ m/s".
What is the time period?The following formula gives the time period of the object:
[tex]T=\frac{2\pi}{\omega}\\\\[/tex]
[tex]\omega = \frac{2\pi}{T}[/tex]
where,
[tex]\omega[/tex] = angular speed = ?T = time period = 2.2 x 10⁴ sTherefore,
[tex]\omega=\frac{2\pi}{2.2\ x\ 10^4\ s}\\\\\omega=2.86\ x\ 10^{-4}\ rad/s[/tex]
Now, the tangential speed can be given by the following formula:
[tex]v=r\omega[/tex]
where,
r = radius = 1.8 x 10⁸ mv = tangential speed = ?Therefore,
[tex]v=(1.8\ x\ 10^8\ m)(2.86\ x\ 10^{-4}\ rad/s)[/tex]
v = 5.1 x 10⁴ m/s
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Answer: 5.1 x 10⁴ m/s
Explanation:
edge 2023
Two objects are filled with air, and have the exact same mass. There air in the first object is heated and it now has a higher temperature than the second object. The air in which object has more thermal energy?
Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen lithium oxide right arrow. lithium lithium oxygen right arrow. lithium oxide oxygen lithium right arrow. lithium oxide lithium oxide right arrow. lithium oxygen
The equation of the reaction for the formation lithium oxide from lithium and oxygen is given as:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
What is the equation for the formation of Lithium oxide?Lithium oxide is a compound formed from the reaction between lithium and oxygen.
The equation for the chemical reaction is given below:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
Therefore, the reaction between lithium and oxygen yields lithium oxide.
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What is the molarity of the resulting solution when 45.0 mL of a 1.90 M H2SO4 solution is added to 95.0 mL of 0.600 M H2SO4
When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.
To answer the question, we need to know what molarity is.
What is molarity of a solution?Molarity is the number of moles per unit volume with volume in liters.
To find the molarity of the resulting solution, we need to find the number of moles in each solution.
Number of moles, n = MV where
M = molarity of solution and V = volumeNumber of moles in first solution
Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.
M' = 1.90 M and V' = 45.0 mL = 0.045 L
So, n' = M'V'
= 1.90 M × 0.045 L
= 0.0855 mol
Number of moles in second solution
Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.
M" = 0.600 M and V" = 95.0 mL = 0.095 L
So, n" = M"V"
= 0.600 M × 0.095 L
= 0.057 mol
Number of moles in resulting solution
The number of moles in the resulting solution is n'" = n' + n"
= 0.0855 mol + 0.057 mol
= 0.1425 mol
Volume of the resulting solution
The volume of the resulting solution is V"' = V' + V"
= 45.0 mL + 95.0 mL
= 150.0 mL
= 0.15 L
The molarity of the resulting solution
The molarity of the resulting solution is M'" = n"'/V"'
= 0.1425 mol/0.15 L
= 0.95 mol/L
= 0.95 M
So, the molarity of the resulting solution is 0.95 M.
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How many moles of oxygen are required to make 4 moles of water?
Answer:
2 moles of oxygen
Explanation:
Basic Equation (given) :
2H₂ (g) + O₂ ⇒ 2H₂O (g)
From this, we understand for every 2 moles of water, 1 mole of oxygen is neededTaking the number of moles of oxygen and water in proportion :
1 : 21 × 2 : 2 × 22 : 4Therefore, 2 moles of oxygen are required to make 4 moles of water.
[tex] \textsf{\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
As per the given equation, we can infer that :
For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :
We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.
[tex] \qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O[/tex]
therefore, we need
[tex]\qquad \sf \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas[/tex]
illustrate an oxygen atomic drawing
what information we get Chemical equation ?
Answer:
We get the following information from a chemical equation :--1. We get the symbol and formulas of the reactants and products.
2. The physical state of the reactants and products.
3. From this reaction, we can know the molecular formula of ammonia, water and nitrogen.
4. Here all the species are in a gaseous state.
5. The reaction takes place at a high temperature and pressure.
6. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as:
Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO 4→ZnSO 4 +H2.
Burning a piece of wood in fire can be best described as a
Answer:
Chemical Change
Explanation:
A chemical change is when something is turned into a new substances.
In this example the wood is being turned into ash.
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What is the wavelength of a wave that has a frequency of 6.1 x 10^9 Hz? Remember that c = 2.998 x 10^8 m/s.
A.) 52m
B.) 5.2m
C.) 0.49m
D.) 0.049m
Answer:
speed = wavelength × frequency
wavelength = Speed/frequency
wavelength = 2.998 x 10^8 m/s ÷ 6.1 x 10^9 Hz
wavelength = 0.049m
True or false: in an ionic bond, the difference in electronegativities between the two bonding
atoms is greater than the difference in a covalent bond.
Answer:
its true hope this helped :)
What is the name of this alkane? two central carbons are bonded to c h 3 at each end, h below, and c h3 above the left carbon and h above the right carbon. 1-methylbutane 2-methylbutane 1,2-triethylethane 1-dimethylpropane
The name of this alkane is with central carbons are bonded to c h 3 is 2-methylbutane.
What is alkane?
Alkanes belong to the family of saturated hydrocarbons with carbon carbon single bond.
For the given alkane;
CH₃ H
CH₃ - C - C - CH₃
H H
Thus, the name of this alkane is with central carbons are bonded to c h 3 is 2-methylbutane.
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Answer:
2-methylbutane
Explanation:
nuclear reactions take place where?
a) ring of electrons, b) the entire atom, c) nucleus, d) none of these
Select the correct answer. which element can bond with titanium (ti) to form a polar covalent bond? a. beryllium (be) b. fluorine (f) c. manganese (mn) d. nitrogen (n) e. oxygen (o)
The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).
What is a Covalent Bond?In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.
Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.
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Compounds I and II can be distinguished by comparing the number of signals in their 1H NMR spectra. How many signals are expected in the 1H NMR spectrum of each compound
The spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
What is a compound?A compound is a substance formed by combining two or more different chemical elements in such a way that the atoms of the individual elements are linked together by chemical bonds that are difficult to break in chemistry.
Hence it is right to state that the spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
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a radioisotope has a half life of 32 hours. if the average decay rate is 24 million decays per second on monday morning at 8 am, what was the decay rate on the previous morning at 10 am g
The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.
Initial decay rate of the radioisotopeThe initial mass of the radioisotope is calculated as follows;
N = N₀(¹/₂)^t/h
where;
h is half life = 32 hourst is time of day, from 8 am to 10 am previous day = 22 hours24 M/s = N₀(¹/₂)^(22/32)
24 M/s = N₀(0.62)
N₀ = (24 M/s)/(0.62)
N₀ = 38.7 M/s
Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.
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One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements?
Answer:
deferent elements
Explanation:
because 11n 12 is not the same as well as13
Answer: They are the same elements
Explanation:
They're same elements because the number of electrons are same (number of protons=electrons).
The number neutrons don't matter.
If any two atoms have the same number of Electrons and protons and has different number of neutron's they still are the same element.
Which is true about distillation? (1 point)
It uses semipermeable membranes to filter out particles.
It removes mainly large particulate contaminants which settle to the bottom.
It is one of the easiest and cheapest filtration solutions to implement.
It may leave some chemicals such as herbicides and pesticides in the water.
Answer:
It may leave some chemicals such as herbicides and pesticides in the water
Explanation:
i just took the test
Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.
What is distillation ?By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.
A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.
Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.
Thus, option D is correct.
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Does the amount of water affect the growth of a plant?
Answer:
Yes
Explanation:
It does because of the fact that plants need water to live and the grow. Water helps the plant grow, and certain plants would need less or more water based on their roots, leaves, and tempurature tolerancy.
Answer: Yes,
Roots need both water and oxygen, and when surrounded by water, they cannot take up oxygen. Plants may slow in growth after a flush of new growth or a heavy flowering. During these periods and while it is dormant, a plant will need less water.
Which of the following elements is often used as a reactant in a nuclear fission reactor?
A. Hydrogen
B. Uranium
C. Carbon
D. Boron
Answer:
B
Explanation:
Uranium is windly use to reactant.
what is the mass in grams for 7.14x10^3 mol of PCI3?
Answer:
980,536.2 grams
Explanation:
The mass of a compound is equal to its moles times its molar mass.
The molar mass of PCl3 is 137.33 g/mol
137.33 x 7.14 x 10^3 = 980,536.2
the weather patterns seen on earth are influence greatly by
Answer: The butterfly effect
Explanation:
