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ur answer is:-
date ancient bones
Scientists currently use radioactive isotopes in various field. Some radioactive isotopes are used to date ancient bones.
What are isotopes?Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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For the balanced equation 2C6H6OS+1102=12CO+6H2O+2SO3 how many moles of C6H6OS reacted if 0.474 moles of SO3 are produced?
Answer:
0.474 moles of C₆H₆OS
Explanation:
Step 1: Write the balanced equation
2 C₆H₆OS + 11 O₂ ⇒ 12 CO + 6 H₂O + 2 SO₃
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₆H₆OS to SO₃ is 2:2.
Step 3: Calculate the moles of C₆H₆OS reacted if 0.474 moles of SO₃ are produced
We will use the previously established molar ratio.
0.474 mol SO₃ × 2 mol C₆H₆OS/2 mol SO₃ = 0.474 mol C₆H₆OS
Question Determine the concentration of hydroxide ions for a 25 °C solution with a pH of 8.22. . Your answer should contain 2 significant figures.
Answer:
[tex][OH^-]=1.7x10^{-6}M[/tex]
Explanation:
Hello!
In this case, since the pOH of a solution can be computed when knowing the pH as shown below:
[tex]pH+pOH=14\\\\pOH=14-8.22=5.78[/tex]
And therefore, the concentration of hydroxide ions based on the definition of pH:
[tex][OH^-]=10^{-pOH}[/tex]
In such a way, we obtain:
[tex][OH^-]=10^{-5.78}=1.7x10^{-6}M[/tex]
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How many grams are in 2.2 moles of sodium hydroxide (NaOH)?
Answer:
1 mole is equal to 1 moles NaOH, or 39.99711 grams.
(( hoped this helped ))
Answer:
1 mole is equal to 1 moles Sodium Hydroxide, or 39.99711 grams. Note that rounding errors may occur, so always check the results.
If the common element of Fluorine-9 and one of the isotopes is Fluorine-10, what does the -10 tell us about the element and how many protons and neutrons does the element have?
flourine have 9 proton
19 neutrons and 9 electron
mark be a brain list
1. Write the equilibrium constant expression for the following:
CS2(g) + 4 H2(g) ⇌ CH4(g) + 2 H2S(g) Kp =
2. Calculate the value of Kp for the above reaction if the equilibrium pressures for each of the
components are as follows:
ௌమ = 0.500 , ுమ = 0.100 , ுర = 1.00 , ுమௌ = 0.800
3. Given the above equilibrium reaction, predict in which direction the equilibrium will shift if the
pressure of the vessel is decreased. Explain in 2-3 sentences why
4. If the Kp of your reaction = 0.00274, calculate what Kc should be using the equation Kp = Kc(RT)Δn
5. For the reaction: A2(g) + B(g) ⇌ 2C(g) it is found that by adding 1.5 moles of C to a 1.0 L
container, an equilibrium is established in which 0.30 moles of B are produced.
a) What is [A] at equilibrium?
b) What is [B] at equilibrium?
c) What is [C] at equilibrium?
d) Write the expression for the equilibrium constant, Keq
e) Calculate the value for the equilibrium constant
6. Consider the reaction 2NO2(g) ⇌ N2O4(g) to be at equilibrium with
[NO2(g)] = 1.60 M, [N2O4] = 0.20 M, and Kc = 0.078.
1. Predict qualitatively what will happen to this reaction if more NO2 is added so that
[NO2(g)] = 2.00 M?
2. Predict qualitatively what will happen to this reaction if instead NO2 is removed so that
[NO2(g)] = 1.00 M?
7. Calculate the values for Qc for these two experiments.
(a) [NO2(g)] = 2.00 M and [N2O4] = 0.20 M: Qc =
(b) [NO2(g)] = 1.00 M and [N2O4] = 0.20 M: Qc =
8. What in general happens to a reaction if
(a) Qc Kc
9. A mixture of H2 and I2 is allowed to react at 448°C. When equilibrium is established, the
concentrations of the participants are found to be:
[H2] = 0.46 M, [I2] = 0.39 M and [HI] = 3.0 M.
The equation is: H2(g) + I2(g) ⇌ 2HI(g)
Calculate the value of Keq at 448°C.
10. CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
At 900 K, Kc = 1.56 for this reaction. A sample of water gas flowing over coal at 900 K contains a
1:1 mole ratio of CO(g) and H2(g), as well as 0.250 mol L–1 H2O(g). This sample is placed in a
sealed container at 900 K and allowed to come to equilibrium, at which
point it contains 0.070 mol L–1 CO2(g). What was the initial concentration of CO(g) and H2(g) in
the sample?
11. At 700 °C, hydrogen and iodine react according to the following equation.
H2(g) + I2(g) ⇌ 2HI(g) Kc = 49.0
Hydrogen also reacts with sulfur at 700 °C:
2H2(g) + S2(g) ⇌ 2H2S(g) Kc = 1.075 × 108
Calculate Kc for the following overall equilibrium reaction at 700 °C.
2I2(g) + 2H2S(g) ⇌ S2(g) + 4HI(g) Kc = ?
12. The KC for the reaction: PCl5(g) ⇌ PCl3(g) + Cl2(g) at 250°C is found to be 0.042. In an equilibrium
mixture of these species, it is found that [PCl5] = 0.012 M, and [Cl2] = 0.049 M. What is the
equilibrium [PCl3] at 250 °C?
13. At a certain temperature, the reaction: CO(g) + 2H2(g) ⇌ CH3OH(g) has a Keq = 0.500. If a reaction
mixture at equilibrium contains 0.210 M CO and 0.100 M H2, what is the equilibrium [CH3OH]?
14. Given the equilibrium equation: H2(g) + I2(g) ⇌ 2HI(g) at 448°C, Keq = 50.
If 3.0 mol of HI, 2.0 mol of H2, and 1.5 mol of I2 are placed in a 1.0 L container at 448°C, in which
direction will the reaction go? Towards the left or towards the right?
15. Given the equilibrium equation: H2(g) + I2(g) ⇌ 2HI(g) at 448°C, Keq = 50. If 5.0 mol of HI, 0.7071
mol of H2, and 0.7071 mol of I2 are placed in a 1.0 L container at 448°C, will a reaction occur?
16. Given the reaction: 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g) ΔH = -113 kJ
How will the value of the equilibrium constant Keq at 550 oC compare with its value at 450 oC?
17. Using the principles postulated by Le Châtelier, predict which direction (left, right, or no change)
the given reaction will go if the following occurs:
4 NH3(g) + 5 O2(g) ⇌ 4 NO(g) + 6 H2O(g) ΔHrxn = -905.5 kJ/mole
a. Nitrogen monoxide is added to the vessel:
b. The pressure in the vessel is increased:
c. The reaction is cooled:
d. Carbon dioxide gas is pumped into the reaction vessel:
Answer:
c
Explanation:
it could honestly be wrong but I'm not sure
describe how plants might be affected if the inter molecular forces in water decreased? i need asap!
Answer:
Water has polar O-H bonds. The negative O atoms attract the positive H atoms in nearby molecules, leading to the unusually strong type of dipole-dipole force called a hydrogen bond. Since water has hydrogen bonds, it also has dipole-induced dipole and London dispersion forces.
Hope it helped!!
True or false. The particulates left from combustion have the same mass as the substance that was burned. Giving Brainliest!
The study of chemicals is called chemistry.
The correct answer is true.
What is combustion?The process of burning anything in the presence of oxygen is called combustion.According to the question, the statement is right because the solid amount is converted into the gas after burning but the mass remains constant.
law of conservation of massit states that the mass of the element remains constant before and after the reaction.Hence, the correct answer is true.
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How many grams of ethanedioic acid is required to prepare 2M solution of the NaOH
Answer:
I don't know
Explanation:
kahit Hindi ko alam
Please help! Very important and will give brainliest to correct answer!
Two gas jars are connected to each other, but they are separated by a closed valve. One gas jar contains oxygen, and the other is empty. What will happen when the valve is opened?
Select one:
a. Oxygen molecules will remain in their original jar because of the very high density of the oxygen molecules.
b. Oxygen molecules will remain in their original jar because there is enough space in the original jar.
c. Oxygen molecules will spread evenly throughout both jars because of weak intermolecular forces.
d. Oxygen molecules will spread through both jars because of the high molecular weight of oxygen.
Answer:
c
Explanation:
they are a gas
Answer:
c. Oxygen molecules will spread evenly throughout both jars because of weak intermolecular forces.
Explanation:
Gases mold to take shape and fill the containers they're in.
Hope this helps :)
Convert 4.56 g/ml to lb-fl-oz
Answer:
g-lb 0.01005308
ml-fl Oz 0.1541919
The value of 4.56 g/mL is 0.296 lb/fl-oz.
Explanation:
Given:
The density with 4.56 g/mL
To find:
Convert 4.56 g/ml to lb/fl-oz
Solution:
In 1 pound there are 453.592 grams:
[tex]1 pound = 453.592 grams\\1 grams=\frac{1}{453.592 } pounds\\4.56 g/mL=4.56\times\frac{1}{ 453.592} lb/mL\\=0.0100 lb/mL[/tex]
In 1 fluid ounce there are 29.5735 milliliters:
[tex]1 \text{fluid ounce} = 29.5735 milliliter\\1 mL=\frac{1}{29.5735} fl-oz\\0.0100 lb/mL=\frac{0.0100}{\frac{1}{29.5735}} lb/fl-oz\\0.0100 lb/mL=0.0100 \times\frac{29.5735}{1} lb/fl-oz\\=0.296 lb/fl-oz[/tex]
The value of 4.56 g/mL is 0.296 lb/fl-oz.
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The mass number of an atom is determined by ___.
1.adding the protons and electrons
2.adding the protons and neutrons
3.adding the electrons and neutrons
4. adding the protons,electrons and neutrons
Write a balanced equation for copper metal and aqueous sulfuric acid react to form a solid copper (II) sulfate, liquid water, and sulfur dioxide solid.
Answer:
Cu (s) + 2H₂SO₄(aq) —> CuSO₄(s) + 2H₂O (l) + SO₂(s)
Explanation:
Copper metal => Cu
Sulphuric acid => H₂SO₄
copper (II) sulfate => CuSO₄
Water => H₂O
sulfur dioxide => SO₂
The equation for the reaction between copper metal and aqueous sulfuric acid can be written as follow:
Cu + H₂SO₄ —> CuSO₄ + H₂O + SO₂
The above equation can be balance as follow:
Cu + H₂SO₄ —> CuSO₄ + H₂O + SO₂
There are 2 atoms of S on the right side and 1 atom on the left side. It can be balance by writing 2 before H₂SO₄ as shown below:
Cu + 2H₂SO₄ —> CuSO₄ + H₂O + SO₂
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 2 before H₂O as shown below:
Cu + 2H₂SO₄ —> CuSO₄ + 2H₂O + SO₂
Thus, the equation is balanced.
Include the phase of each reactant and product, we have:
Cu (s) + 2H₂SO₄(aq) —> CuSO₄(s) + 2H₂O (l) + SO₂(s)
In which environment is erosion likely to have the most impact?
a steep hillside with little vegetation and strong downpours
a steep hillside covered with grasses and mild downpours
a flat valley with little vegetation and heavy downpours
a flat valley covered with grasses and mild downpours
Answer:
A. Steep hillside, little vegetation, strong downpours
Explanation:
between a steep hill and a flat valley, the hill is more likely to be affected because of gravity. with a valley theres less places for the dirt to actually move to. So C and D are not correct
a lack of vegetation and heavy downpour is the perfect condition for erosion. plants' root system makes dirt and rock more stable. without a lot of roots to hold the dirt in place and absorb water before it runs over the rocks and breaks them down, heavy rain would be a lot more likely to erode the area. so B isnt right either
Select all of the ways collection areas use to gain water. precipitation falls direction into the collection area runoff from precipitation water evaporates from the collection area
"Precipitation falls direction into the collection area" and "runoff from precipitation" are the correct ways.
Ways of collecting waterThe ways such as "Precipitation falls direction into the collection area" and "runoff from precipitation" through which collection areas use to gain water because these two activities bring water to the collection areas
While on the other hand, "water evaporates from the collection area" is the activity which removes water from the collection area so we can conclude that "Precipitation falls direction into the collection area" and "runoff from precipitation" are the correct ways.
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How many moles are there in 100 grams of carbon dioxide?
Answer:
there are 8.3259093974539 moles in 100 grams of carbon dioxide
The number of moles that are in 100 grams of carbon dioxide is 2.272 g/mol. Moles can be calculated by dividing the mass by the molar mass of the compound.
What are moles?"The mole is a SI unit of measurement that is used to calculate the quantity of any substance."
The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound. Mass is the quantity of matter of a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.
Moles = mass / molar mass
The mass of carbon dioxide is 100 grams
The molar mass of carbon dioxide is 44.01 g/mol
Put the values in the formula of moles:
100 / 44.01 = 2.272 g/mol
Therefore, there are 2.272 g/mol of moles in 100 grams of carbon dioxide.
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many fish, insect, and including the common housefly, produce large amounts of glycerol (C³H³O³) in cold areas to lower the freezing point of their blood. what percent of oxygen is percent in glycerol
A. 52.11% B. 51.11%
C. 53.11% D. 50.11%
Answer:
A. 52.11%
Explanation:
Percentage of Oxygen= (mass of Oxygen in glycerol/ mass of glycerol) x 100
= ((16*3)/ 92.11) x 100
=52.11%
What occurs when a molecule combines with Oxygen and produces heat?
A. It dissolves
B. It precipitates
C. It Evaporates
D. it combusts
Answer:
D. it combustsExplanation:
Combustion is when fuel reacts with oxygen to release heat energy. Combustion can be slow or fast depending on the amount of oxygen available. Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases.
What is the element in period 3 that required requires the least amount of energy?
Consider a car being acted on by balanced forces. Can you conclude whether the car is moving or at rest? Explain your response.
Since the car is being acted upon by balanced forces, the car is at rest. as the forces are being balanced.
What is a force?
Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What happens when samples of matter interact?
Answer: matter and its interaction with energy. Matter has mass and occupies space. A Substance is matter that cannot be separated into other kinds of matter by physical means.
Explanation:
Why water is able to stick to the side of a glass
Answer:
Water uses adhesive forces that allow it to stick to certain surfaces such as glass.
Explanation:
When the angle between vertical direction and the glass wall is small, surface tension is stronger and the component of gravity perpendicular to the glass wall is small. The result of this causes water to stick to the side of a glass.
Hope this helps!
Which set of coefficients will balance this chemical equation?
C2H4(g) + _O2(g) → 2C02(g) + 2H2O(g)
Answer:The answer is D.1,3
Explanation:
Calculate the mass of iron (iii) oxide that contains a trillion iron atoms
Answer:
Calculate the mass of iron(III) oxide (Fe20) that contains a trillion (1.000x 10") oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits. A chemist measures the amount of oxygen gas produced during an experiment. He finds that 9.2 g of oxygen gas is produced.
Explanation:
Which of the following correctly describes molecules of two different gases if they are at the same temperature and pressure?
CA. They must have the same mass.
CB. They must have the same velocity
CC. They must have the same average kinetic energy
CD. They must have the same average potential energy
Answer: C. They must have the same average kinetic energy.
Explanation: I got it right
How many moles are present in 63.80L of oxygen gas, O2?
Answer:
2.85moles of oxygen gas
Explanation:
Given parameters:
Volume of oxygen gas = 63.8L
Unknown:
Number of moles = ?
Solution:
We assume that the gas is under standard temperature and pressure. To find the number of moles, use the expression below:
1 mole of a gas at STP occupies a volume of 22.4L
So;
63.8L of oxygen gas will take up a volume of
[tex]\frac{63.8}{22.4}[/tex] = 2.85moles of oxygen gas
Sorry if it’s not a good pic but...What’s the answer?!?
Answer:
If the products contain 3 nitrogen atoms, then so did the reactants since overall mass is conserved in a chemical reaction.
Explanation:
so the answer is A
Convert 2.345 centimeters cubed to inches cubed. 1inch = 2.54cm
Answer:
0.92322835
Explanation:
0.92322835 rounded= 0.9 or 0.92
2.345 centimeters cubed is equal to 0.1431 inches cubed.
Units of volume are used to measure the amount of space occupied by an object or substance. Volume is a three-dimensional quantity and is typically expressed in cubic units. Some common units of volume include:
Cubic Meter (m³): This is the SI unit of volume and represents the volume of a cube with sides measuring one meter.Cubic Centimeter (cm³): This is a smaller unit of volume often used for measuring the volume of small objects or substances. It is equal to the volume of a cube with sides measuring one centimeter.Liter (L): The liter is a commonly used unit of volume in everyday life. It is equal to one cubic decimeter or 1,000 cubic centimeters.Milliliter (mL): The milliliter is a smaller unit of volume often used for measuring liquids or small quantities. It is equal to one-thousandth of a liter or one cubic centimeter.Other units of volume, such as gallons, cubic feet, and ounces, are also used in specific contexts or regions. It is important to use appropriate conversion factors when converting between different units of volume.
1 inch = 2.54 cm.
1 cm = 1/2.54 inches
(1 cm)³ = (1/2.54 inches)³
1 cm³ = (1/2.54)³ inches³
2.345 cm³ = 2.345 × [(1/2.54)³] inches³
2.345 cm³ ≈ 0.1431 inches³ (rounded to four decimal places)
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How has the human population changed during the past 50 years
Answer:
The human population has increased by the billions, and we have been creating better and more complex technology over the years. So, overall there is a difference between now and 50 years ago.
When a real gas is placed into a container at high pressure, why might the pressure of the gas be higher than what was predicted by the ideal gas law?
Answer:The correct answer is A.
Explanation:Properties of ideal gases have different volumes under very high pressure. These gases take up additional volume when there is high pressure exerted, and the predicted volume of these gases will end up being smaller than the actual values of the gas volumes. Therefore, the true volume of the gases will be higher than the low ones that were predicted, giving your answer A.