Final answer:
To find the height of a stack of 1000 pennies, multiply the thickness of one penny (1.52mm) by 1000, resulting in a stack 1520mm tall, which is 152 centimeters.
Explanation:
The question concerns how tall a stack of 1000 pennies would be in centimeters. To answer this, we must know the thickness of one penny. If we assume the thickness of a single penny is approximately 1.52mm (0.0598 inches), we can calculate the height of 1000 pennies by multiplying the thickness of one penny by the number of pennies in the stack. Since there are 10 millimeters in 1 centimeter, we'll need to convert millimeters to centimeters.
Here is the calculation:
Thickness of one penny = 1.52mmHeight of 1000 pennies = 1000 x 1.52mm = 1520mmHeight in centimeters = 1520mm / 10 = 152cmHELP! I will give brainliest for correct answer
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:
N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure. What is the ΔH in kJ of heat released per mole of NH3(g) formed?
A.)50.2 kJ
B.)50.2 kJ
C.)4 kJ
D.)4 kJ
The mass defect is the result of what action occurring?
A. energy being converted into moles of atoms when neutrons break apart protons
B. mass being converted to energy when protons and neutrons bind together in a nucleus
C. mass being converted to energy when protons and neutrons break apart in a nucleus
D. protons and electrons being attracted to each other
E. strong forces overcoming weak forces
B. mass being converted to energy when protons and neutrons bind together in a nucleus
Explanation;The mass defect of a nucleus refers to the mass of the energy binding the nucleus. This energy is given by the difference between the mass of a nucleus and the sum of the masses of the nucleons of which it is composed.Mass defect is energy mass that is removed from the total mass of the original particles when a nucleus is formed. This mass is missing in the resulting nucleus and represent the energy lost when the nucleus is formed.Air contains water in a gaseous form called _____.
Air contains water in a gaseous form called water vapor
The polar portion of a cholesterol molecule, which forms hydrogen bonds with the polar heads of neighboring phospholipids and glycolipids, consists of a
When sodium chloride reacts with silver nitrate, silver chloride precipitates. what mass of agcl is produced from 75.00 g of agno3?
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the mass of AgCl produced from 75.00 g of AgNO[tex]_3[/tex]. is 63.0g.
What is stoichiometry?Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.
The balanced reaction is
NaCl + AgNO[tex]_3[/tex] → NaNO[tex]_3[/tex] + AgCl
Mass of AgNO[tex]_3[/tex]=75.00 g
Molar mass of AgNO[tex]_3[/tex]=169.87 g/mol
Moles of AgNO[tex]_3[/tex]=0.44mol
From 1 mole of AgNO[tex]_3[/tex], 1 mole of AgCl is produced.
So, from 0.44 of AgNO[tex]_3[/tex], 0.44 mole of AgCl is produced.
Mass of AgCl =Molar mass of AgCl ×moles of AgCl
Mass of AgCl =143.32 g/mol ×0.44 mole
Mass of AgCl =143.32 g/mol ×0.44 mole
Mass of AgCl =63.0g
Therefore, the mass of AgCl produced from 75.00 g of AgNO[tex]_3[/tex]. is 63.0g.
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Which analogy can best be likened to the activation energy of a chemical reaction?
Can someone please help me:)
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A radon atom has 86 protons, 136 neutrons, and 86 electrons. What will it change to during alpha decay?
An astatine atom with 85 protons, 137 neutrons, and 86 electrons
A francium atom with 87 protons, 135 neutrons, and 86 electrons
A polonium atom with 84 protons, 134 neutrons, and 86 electrons
A radon atom with 86 protons, 136 neutrons, and 85 electrons
A Term that describes a group of diseases caused by mutations and different genes
In the reaction n2 + 3h2 ---> 2nh3, how many grams of nh3 are produced if 25.0 g n2 reacts with excess h2? question 10 options:
How many moles are there in a 1.40 kg bottle of water?
Determine the molar solubility of baf2 in pure water. ksp for baf2 = 2.45 x 10-5. 1.83 x 10-2 m 1.23 x 10-5 m 2.90 x 10-2 m 4.95 x 10-3 m 6.13 x 10-6 m
The molar solubility of BaF2 in pure water is approximately 6.13 x 10⁻⁶ M.
Explanation:The molar solubility of BaF2 in pure water can be calculated using the solubility product constant (Ksp) of BaF2. The equation for the dissolution of BaF2 is BaF2 → Ba²+ + 2F¯. The Ksp expression for BaF2 is Ksp = [Ba²+][F¯]². Since there is a 1:2 stoichiometric relationship between BaF2 and fluoride ions in solution, the molar solubility of BaF2 can be represented as x, which gives the concentrations of Ba²+ and F¯ as x and 2x, respectively. Substituting these values into the Ksp expression, we get:
Ksp = (x)(2x)² = 4x³ = 2.45 x 10⁻⁵
Solving for x, we find that the molar solubility of BaF2 in pure water is approximately 6.13 x 10⁻⁶ M.
Does the entropy (△S) increase or decrease in each of the following processes? The wind blows a pile of leaves all over the yard. As you are pumping gas into your car, gas fumes escape into the air. a. decreasing decreasing b. increasing decreasing c. decreasing increasing d. increasing increasing
A solution is made by dissolving 25.5 grams of glucose (C6H12O6) in 398 grams of water. What is the freezing point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.
Please help!
What group of elements generally have the lowest second ionization energy?
Find the no. Of electron involved in the electro deposition of 63.5g of cu from a solution of cuso4
Cu(NO3)2 + Zn (s) → Cu (s) + Zn(NO3)2 is an example of which type of reaction?
Combustion
Decomposition
Single-displacement
Double-displacement
Answer:
Single-displacement
Explanation:
3. The bonds between hydrogen and oxygen in water differ from the bonds between hydrogen and carbon in carbohydrates. How and why do these bonds differ?
What is the correct formula for calcium cyanide?
A. Ca2CN
B. CN(Ca)2
C. Ca(CN)2
D. CaCN
What is the concentration of k+ ions in a 0.045 m k2co3 solution assuming complete dissociation?express the concentration in molarity?
Answer: The concentration of [tex]K^+[/tex] ions in the solution is 0.09 M
Explanation:
We are given:
Concentration of [tex]K_2CO_3[/tex] = 0.045 M
The chemical equation for complete dissociation of potassium carbonate follows:
[tex]K_2CO_3(aq.)\rightarrow 2K^+(aq.)+CO_3^{2-}(aq.)[/tex]
By stoichiometry of the reaction:
1 mole of potassium carbonate produces 2 moles of potassium ions and 1 mole of carbonate ions.
So, the concentration of potassium ions in the given solution = [tex](2\times 0.045M)=0.09M[/tex]
Hence, the concentration of [tex]K^+[/tex] ions in the solution is 0.09 M
A student performs an experiment that produces solid sodium chloride. He uses four different catalysts and lets the reaction run for two minutes, and then removes the sodium chloride product. Which is the best way for him to make a consistent measurement that would show the different amounts of sodium chloride produced?
Answer:
☆☆ Measure the four products separately, but using the same scale each time. option C
Explanation:
He cannot do this without affecting at the same time the evolution of the reaction, and of course by doing it on one sample only he will not be able to compare.
Which of the following reactions is a neutralization reaction? A. ZnCl2(aq) + CaCrO4(aq) → ZnCrO4(s) + CaCl2(aq) B. HNO3(aq) + LiOH(aq) → H2O(l) + LiNO3(aq) C. 2NaOH(aq) + MgCl2(aq) → Mg(OH)2(s) + 2Na+(aq) + 2Cl−(aq) D. 4Fe(s) + 3O2(g) → 2Fe2O3(s)
A neutralization reaction is a chemical reaction between an acid and a base that results in water and a salt. Option B, HNO3(aq) + LiOH(aq) → H2O(l) + LiNO3(aq), is an example of this as it involves the reaction between an acid (Hydrogen Nitrate) and a base (Lithium Hydroxide) to form water and a salt (Lithium Nitrate).
Explanation:In chemistry, a neutralization reaction is a type of chemical reaction where an acid and a base react to form a salt and water. Looking at the provided options, the reaction B. HNO3(aq) + LiOH(aq) → H2O(l) + LiNO3(aq) is a neutralization reaction. This is because Hydrogen Nitrate (HNO3) is an acid and Lithium Hydroxide (LiOH) is a base. The result of their interaction is water (H2O) and a salt (LiNO3).
A neutralization reaction is characterized by an acid reacting with a base and forming water and a salt, which is what happens in this reaction. Hence, option B depicts a neutralization reaction.
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How did the discoveries of scandium (sc) and germanium (ge) affect mendeleevâs work?
they showed mandeleeves predictions were correct
How many bonding electrons are in the lewis structure of carbon monoxide, co?
Answer:
6
Explanation:
The Lewis structure represents the valence electrons at the atoms, which ones are shared and the lone pairs. Carbon is at group 4 at the periodic table, and so has 4 electrons in the valence shell; oxygen is at group 6, and so has 6 electrons at the valence shell.
That compound is an exception of the octet rule. A triple bond is done between the atoms, and so, 3 electrons of carbon are shared and 3 electrons of oxygen are shared. Thus, there are 6 bonding electrons, as shown below in red.
How is gamma radiation different from other types of electromagnetic radiation
Sally is measuring the weight of a sodium chloride crystal. the scale indicates the crystal weighs 10.0010 g. how many significant figures are in this measurement?
Actually there are three established rules on counting how many significant figures are in a number:
Rule 1: Positive integers are always significant.
Rule 2: Any zeros between two significant digits are always significant.
Rule 3: A final zero or trailing zeros after the decimal point are always significant.
Since the given number is 10.0010 g, the two 1’s is under Rule 1, the three 0’s between the two 1’s is under Rule 2, and the zero after the last 1 is under Rule 3. Therefore all the digits are significant.
Answer: So the number of significant figures in the measurement is 6.
If Uranium-234 decays via alpha emission, what is the likely product of radioactive decay? (U, atomic no. = 92)
An alpha emission is one in which an atomic nucleus emits an alpha particle (helium nucleus). Therefore in this reaction, the products of the decay are Helium and another element X. Helium has an atomic mass and atomic number of 4 and 2 respectively, therefore the complete reaction is:
U-234 (92) ---> He-4 (2) + X
Since atomic mass and number must be conserved therefore X = X-230 (90)
U-234 (92) ---> He-4 (2) + X-230 (90)
The element with atomic number of 90 is Thorium. Therefore the other product is Thorium-230 (90).
U-234 (92) ---> He-4 (2) + Th-230 (90)
Which pair of elements is most apt to form a molecular compound with each other?
Determine the ka of an acid whose 0.294 m solution has a ph of 2.80. 1.2 x 10-5 8.5 x 10-6 2.7 4.9 x 10-7 5.4 x 10-3
1)
Calculate [H+] from the pH:
pH = log { 1 / [H+] } = - log [H+]
=> [H+] = 10 ^ (-pH)
=> [H+] = 10 ^ (-2.80) = 0.00158
2) Assume the stoichiometry 1:1
=> HA aq ---> H(+) aq+ A(-) aq
=> [A-] = [H+] = 0.00158
[HA] = 0.294 – 0.00158 = 0.29242
3) Calculate Ka
Ka = [H+] *[A-] / [HA] = (0.00158)*(0.00158) / 0.29242 =8.54 * 10^ -6
Answer: 8.5 * 10^ -6
We have that the acid dissociation constant(Ka) is mathematically given as
Ka=8.54e-6
The acid dissociation constant(Ka)Question Parameters:
Generally the equation for the H+ pH value is mathematically
pH = log { 1 / [H+] }
[tex][H+] = 10 ^{-pH}[/tex]
[H+]= 0.00158
Where the stoichiometric ratio is 1:1
HA aq ---> H(+) aq+ A(-) aq
[H+] = 0.00158
[HA] = 0.294 – 0.00158
[HA]= 0.29242
Therefore
[tex]Ka =\frac{ [H+] *[A-]}{ [HA] }\\\\Ka=\frac{ (0.00158)*(0.00158)}{0.29242}[/tex]
Ka=8.54e-6
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Which type of chemical bond involves the sharing of valence electrons between two atoms?
Answer:
Nonpolar Covalent
The pharmacy receives a prescription for 50 grams of 5% salicylic acid ointment. the pharmacy has a 30% salicylic acid ointment and petrolatum available. using only these products, how much petrolatum should be used to compound the prescription? express the answer in grams. (answer must be numeric; no units or commas; include leading zero when answer is less than 1; round the final answer to the nearest one decimal place.)
In this problem, we can formulate two equations.
First, the overall mass balance of the ointment. The mass of 30% salicylic acid ointment plus the mass of petrolatum must be 50 grams.
x + p = 50
Where x is the mass of 30% salicylic acid ointment and p is the mass of petrolatum
Second, the component mass balance of salicylic acid:
0.3 * x = 50 * 0.05
x = 8.33 g
Therefore the mass of petrolatum to be used is:
x + p = 50
p = 50 – x
p = 50 – 8.33
p = 41.67 g
Answer:
41.7