11460 years ago a sample of wood was the part of a living tree.
What is half-life?The time required for half of something to undergo a process.
Carbon-14 has a half-life of 5,730 years. That means that no matter how many carbon-14 atoms were present when something died, after 5,730 years only half of them are left the rest have decayed to nitrogen.
The half life of C-14 is [tex]t_{\frac{1}{2}}[/tex] =5730 years.
This means that if you start with a sample of 100g, only 50g will be left in 5730 years.
Here, Only 25g is left, therefore the number of years is =5730 × 2 = 11460years.
Hence, 11460 years ago a sample of wood was the part of a living tree.
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What is the number of molecules in CaCo3
Answer:
Solution — Molar mass (Molecular mass in gram) of CaCO3 = 40+12+3×16 = 100 g No. of moles of CaCO3 = No. of molecules/Avogadro constant = 6.022 × 1023/ 6.022 × 1023 = 1 mole Mass of CaCO3 = No. of moles × molar mass = 1 × 100 g = 100 g.
Explanation:
What is the density of an object if its mass is 10 g and a volume of 2 mL?
Hi there! Let's solve this problem shall we!
⠀Volume = 10g
Mass = 2 mL
In this specific problem, they are asking us to find the density of the object. So, using the information given to us (volume and mass), let's solve the problem!
Now, if you remember, D = M ÷ V
So, let's fill in the blanks!
D = Our unknown value
M = 2mL
V = 10g
Here is the filled out formula:
D = M ÷ V
D = 2mL ÷ 10g
D = 5 g/mL
*Make sure you put the units for your final solution!*
FLAG A nurse is preparing to administer morphine 0.05 mg/kg intermittent IV bolus to a newborn who weighs 3 kg. Available is morphine 0.5 mg/mL injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The quantity of morphine, the nurse should administer is 0.3 ml.
What is morphine?Morphine is a drug which comes under the pain relieving drugs.
The quantity of morphine is 0.05 mg/kg
The weight of the baby is 3 kg.
Available morphine is 0.5 mg/mL.
0.05 x 3 = 0.15 mg
then, 0.15 mg / 0.5 = 0.3
Thus, the quantity of morphine, the nurse should administer is 0.3 ml.
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There are 0.45 moles of Kr gas at a pressure of 1.35 atm and a temperature of 35°C. What volume would this gas occupy? (R= 0.0821 Mh/*))
Apply ideal gas equation
PV=nRTV=nRT/PV=0.45(0.0821)(273+35)/1.35V=0.45(0.0821)(308)/1.35V=8.42LUse ideal gas equation
PV=nRT1.35V=0.45(308)(0.0821)135V=11.379V=8.4LHELP PLS!!!! Will give brainliest!!
What mass of water will be produced if 125.00 moles of oxygen are reacted completely?
Answer:
250 moles of H2O
Explanation:
I assume THIS is the equation you are using:
2H2 + O2 =====> 2 H2 O
each mole of O2 results in twice as many H2O moles
so 250
the density (g/ml) of 6 pennies with a mass of 18.53 grams and a volume of 2.0 ml
Answer: 9.27 g/mL
Explanation:
[tex]d=\frac{m}{v}=\frac{18.53}{2.0}=\boxed{9.27 \text{ g/mL}}[/tex]
The liquid iodomethane has a density of 2.28 g/mL at 20.0°C. If a 109 gram sample of this compound is needed, what volume of the liquid at 20.0°C must be provided?
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What is the balanced form of the chemical equation shown below? C12H22O11(I) + O2(g) -> H2O(I)
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex] is the balanced form of the chemical equation.
What is the balanced equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
12 hydrogen, 35 oxygen, and 22 hydrogens are present on both sides of the reaction.
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex]
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how can noble gas electron configuration be achieved
The specific heat of aluminum is 0.900 J/g*°C, the specific heat of air is 1.01 J/g*°C and the specific heat of iron is 0.450 J/g*°C.
Identify the correct statement.
Air requires the most energy to increase its temperature followed by iron and then aluminum.
Iron requires the most energy to increase its temperature followed by aluminum and then air.
Air requires the most energy to increase its temperature followed by aluminum and then iron.
Iron requires the most energy to increase its temperature followed by air and then aluminum.
The correct statement regarding the specific heat capacity of the substance is as follows: air requires the most energy to increase its temperature followed by aluminum and then iron.
What is specific heat capacity?Specific heat capacity of a substance refers to the amount of thermal energy required to raise the temperature of a system by one temperature unit (1°C or 1K) without any change of phase.
According to this question, the specific heat of different elements are as follows:
Aluminum = 0.900 J/g°CAir = 1.01 J/g°CIron = 0.450 J/g°CTherefore, it can be said that air requires the most energy to increase its temperature followed by aluminum and then iron.
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You titrate 25.0 mL of HCl solution of an unknown concentration with a 0.190 M NaOH solution. Complete neutralization of the HCl solution requires the addition of 24.6 mL of titrant.
A titration is defined as 'the process of determining the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalence is achieved (the equivalence point)'.
The Molarity of the HCl Solution requires the addition of 24.6 mL of titrant is 0.0836 M (to 3 significant figures)
What is Titrant?A reagent solution of precisely known concentration that is added in titration
Given reaction HCl + NaOH ===> NaCl + [tex]H_2O[/tex] neutralization reaction
Note that the mole ratio is 1:1 meaning that 1 mole HCl reacts with 1 mole NaOH to produce 1 mole NaCl and 1 mole [tex]H_2O[/tex]
Find moles of NaOH used:
18.45 ml x 1 L/1000 ml x 0.085 mol/L = 0.002091 moles NaOH used
This meant that there must be 0.002091 moles of HCl present in the 25.0 mls.
We want to find the molarity (M) which is moles HCl/liter of solution. We know the moles, and we also know the liters of solution (25.0 mls x 1 L / 1000 mls = 0.025 liters)
M = 0.002091 moles HCl / 0.025 liters = 0.08364 M = 0.0836 M (to 3 significant figures)
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In a boys hostel, 1206 eggs were bought for breakfast for the students. How many moles of eggs does this represent?
Answer:
6.022×1023
Here, it has been asked how many eggs are in one mole of eggs. The eggs represent the unit which can be atom, ion or molecule. So by the definition of mole, 6.022×1023number of eggs are present in one mole of eggs.
In a boys hostel, 1206 eggs would represent 1206 moles of eggs, assuming an average molar mass of 50 grams/mol.
How to calculate moleTo determine the number of moles of eggs, first know the molar mass of eggs or the average molar mass of the components in eggs.
Since the composition of eggs can vary, assume an average molar mass based on the most abundant components.
The molar mass of an egg can be estimated to be around 50 grams/mol. This estimate takes into account the approximate composition of eggs, which consists mainly of water, protein, fat, and other components.
Next, convert the mass of eggs to moles. 1 mole of a substance contains Avogadro's number of molecules or entities, which is approximately [tex]6.022 *10^23.[/tex]
Let's calculate the number of moles of eggs:
Mass of eggs = 1206 eggs * 50 grams/egg
= 60300 grams
Moles of eggs = Mass of eggs / molar mass of eggs
= 60300 grams / 50 grams/mol
= 1206 moles
Therefore, 1206 eggs would represent approximately 1206 moles of eggs, assuming an average molar mass of 50 grams/mol.
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A dunk tank hold 30,533 moles of water? How many grams of water are in the tank?
The mass of water in the tank, given the data from the question is 549594 g
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mass of water in the tankFrom the question given above, the following data were obtained:
Mole of water = 30533 molesMolar mass of water = 18 g/mol Mass of water = ?The mass of the water can be obtained as follow:
Mass = mole × molar mass
Mass of water = 30533 × 18
Mass of water = 549594 g
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Cattle egrets are birds that follow behind grazing cattle. The egrets eat the bugs that fly out of the grass as the cattle walk through. Which statement describes the relationship between the cattle egrets and the cattle?
A
predation, because the cattle egrets eat the bugs
B
mutualism, because both the cattle egrets and the cattle benefit
C
commensalism, because the cattle egret benefits, but the cattle neither benefits nor is harmed
D
parasitism, because the bugs might have bit the cattle egrets or the cattle and caused them harm
Answer: I think it's
b. The sedative Demerol hydrochloride has the formula
C15H22CINO2. How many grams are in 0.025 mole of
Demerol hydrochloride?
Dinitrogen oxide (or nitrous oxide), N₂O, also known as
laughing gas, is widely used as an anesthetic in dentistry.
The number of grams present in 0.025 mole of Demerol hydrochloride is 7.094 grams.
What is Demerol hydrochloride?It is a drug used in treating severe or moderate pain.
The moles are given = 0.025
The formula is C₁₅H₂₂CINO₂
The elements that present are C, H, Cl, N, O.
The molecular weight are given:
Carbon: 12.0107
Hydrogen: 1.00784
Chlorine: 35.453
Nitrogen: 14.007
Oxygen: 15.999
Multiply the molecular weight with moles and add them
(15 x 12.0107) + (22 x 1.00784) + (1 x 35.453) + (1 x 14.007) + (2 x 15.999) = 283.79098 grams per mole.
Now, multiply the number of moles given with the total molecular weight
283.79098 x 0.025 = 7.094
Thus, the number of grams are 7.094.
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which of the following symbol means a subtance is in water solutions?
a) (aq) b.) (w) c.) (s) d.) (I)
Answer:
a.) (aq)
Explanation:
(aq) means aqueous
so its in a solvent
The mass of ethylene glycol (molar mass 62.1 g / mol), the main component of the antifreeze, must be added to 10.0 L of water to obtain a solidified solution at -23 ° C. Assume a water density of 1 g / mL.
the mass of substance is measured in what ?
1. What will happen to your melting point range if you fill the capillary tube almost all the way to the top?
If you fill the capillary tube all the way to the top, it will become difficult to obtain a sharp melting point.
What is melting point?The melting point of a solid is the temperature at which a solid is changed into a liquid upon application of heat.
If you fill the capillary tube all the way to the top, it will become difficult to obtain a sharp melting point thus it should be filled only to about 2 - 3 mm.
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Why do you think most lampshades are made of translucent materials instead of transparent materials?
Explanation:
because translucent shades lets the light through easily (gentle diffusion)
Two moles of gas A spontaneously convert to 3 moles of gas b in a container where the temperature and pressure are held constant. The sample originally took up 13.9L of volume. What is the new volume of the products? Pls show work :)
At constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.
What is Avogadro's law?Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."
It is expressed as;
V₁/n₁ = V₂/n₂
Given the data in the question;
Initial amount of gas n₁ = 2molesInitial volume v₁ = 13.9LFinal amount of gas n₁ = 3molesFinal volume v₂ = ?V₁/n₁ = V₂/n₂
V₁n₂ = V₂n₁
V₂ = V₁n₂ / n₁
V₂ = (13.9L × 3moles) / 2moles
V₂ = 41.7molL / 2mol
V₂ = 20.85L
Therefore, at constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.
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Which statements about kinetic and potential energy are correct?
Multiple select question.
The kinetic energy of a substance is proportional to temperature.
The potential energy of a substance depends on its composition.
The potential energy of a substance depends in part on the constant random motion of its representative particles.
Chemical systems contain both kinetic energy and potential energy.
Multiple choice
Answer:
These three are correct:
The kinetic energy of a substance is proportional to temperature.
The potential energy of a substance depends on its composition.
Chemical systems contain both kinetic energy and potential energy.
Explanation:
Determine the grams of protein in one cup of soup that has 140 kcal with 8 g of carbohydrate and 2 g of fat.
There are 22.5 grams of protein in one cup of soup that has 140 kcal with 8 g of carbohydrate and 2 g of fat.
What is the mass of a substance?The mass of a substance is the quantity of the substance that is being measured in grams or kilograms.
To determine the energy from the 8g of carbohydrate, we have:
= 8g × 4 kcal/g (the corresponding calories of food type)
= 32 kcal
The energy from 2g of fat = 2g × 9 kcal/g
= 18 kcal
The energy from protein is calculated as:
= 140 kcal - 32 kcal - 18 kcal
= 90 kcal
The required mass of the protein in grams is:
[tex]\mathbf{= 90 \ kcal \times \dfrac{1}{4 \ kcal }}[/tex]
= 22.5 grams
Therefore, we can conclude that there are 22.5 grams of protein in one cup of soup.
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Consider the following reversible reaction:
2 CO(g) + O₂(g) 2CO₂(g). Describe a way to increase the CO concentration at equilibrium. Explain your reasoning.
The given equilibrium reaction indicates the reaction between carbon monoxide and the oxygen and forms carbon dioxide. In this reaction, by increasing the concentration of the carbon monoxide, the equilibrium shifts towards the right. Since, the reactant concentration increases, the equilibrium stress decreases the concentration of the reactants and therefore, the equilibrium shift towards the right side of the equation.
reaction indicates that carbon monoxide reacts with oxygen and forms carbon dioxide gas.
By increasing the concentration of carbon monoxide image, the equilibrium in the reaction shifts towards the right.
The effect of change of pressure, concentration and temperature on the state of equilibrium can be predicted with the help of a principle known as Le Chatelier's principle. Here by increasing the concentration of CO₂, the amount of CO formation can increase.
What is Le Chatelier's principle?If a system in equilibrium is subjected to a change in concentration, pressure or temperature, the equilibrium shifts in the direction that tends to reduce or to counteract the effect of change. When the concentration of any substance in equilibrium is increased, the equilibrium shifts in the direction which decreases the concentration of that substance.
On other hand, increasing the concentration of any of the products results in shifting the equilibrium in the backward reaction forming more products. So here increasing the amount of CO₂, shifts equilibrium in the backward direction and forms more amount of CO.
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A chemistry student wants to learn how pressure and volume affect one another. They gather a sample of helium from a ballon and measure the initial pressure at 4.5 atm and bounce at 12.1 liters. The students then increases the pressure to 15.2 atm
What’s P1
What’s P2
What’s V2
Why does silver not react with cold water? Reference to the reactivity series
Answer:
Silver does not react with cold water, because as in the Reactivity Series, Silver is highly unreactive/least reactive metal.
Answer:
Because silver is inert towards cold water.
If you add 25 g of CaCl2 to 1000. mL of water, what would the concentration of the solution be in grams/liter?
If you add 25 g of CaCl2 to 1000. mL of water, what concentration of the solution would be 0. 225 grams/liter
What is molarity?
Molarity or molar concentration(M) is defined as the amount of a substance in a given volume of solution.
It is also known as the moles of a solute in a liter of the solution.
How to determine the concentrationFormula:
Concentration or molarity = number of moles ÷ volume
The number of moles is derived thus;
Number of moles = mass ÷ molar mass
mass of CaCl2 = 25g and molar mass = 110. 98 g/mol
Number of moles = 25 ÷ 110. 98 = 0. 225 mol
Given the volume = 1000 ml = 1 liter
Concentration = 0.225 ÷ 1 = 0. 225 grams/liter
Therefore, If you add 25 g of CaCl2 to 1000. mL of water, the concentration of the solution would be 0. 225 grams/liter
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Could really use a few pointers on this question!
From the calculations, we can see that the theoretical yiled of NO2 is 100L of NO2
What is the theoretical yield?The theoretical yield is that calculated from the stoichiometry of the reaction.
We can see that 1 mole of O2 produced 2 moles of NO2. Thus;
2.23 moles of O2 will produce 4.46 moles of NO2
Since 1 mole of NO2 occupies 22.4 L
4.46 moles of NO2 occupies 100L of NO2
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Is H2O an acid, ionic, or covalent compound?
Answer:
Covalent Compound
Explanation:
H₂O is a covalent compound due to the electronegativity difference between hydrogen and oxygen. Covalent compounds involve elements with similar electronegativity values. Hydrogen has an EN value of 2.2 and oxygen has an EN value of 3.4. These values are not far enough apart to make them form ionic bonds between each other.
While water can act as an acid, it its purest form, H₂O is neutral.
How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3
The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to convert pounds to grams1 lb = 453.592 g
Therefore,
11.8 lb = 11.8 × 453.592
11.8 lb = 5352.3856 g
How to determine the volume Mass = 5352.3856 gDensity = 0.918 g/cm³Volume =?Volume = mass / density
Volume = 5352.3856 / 0.918
Volume = 5830.49 cm³
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