Kilocalorie is a unit of measuring the amount of energy of a reaction, but this is not the only unit, we can also have Joules as a unit, and the conversion is:
1 Kcal = 4184 Joules
Therefore if we have 3.25 Kcal, we will have:
3.25 * 4184 = 13600 Joules of energy, therefore letter D
which metalloid has five valence electrons in the fourth electron shell
Answer:
Explanation:
Arsenic is the the metalloid which has "five valence electrons" in the "fourth electron shell". Explanation: Metalloids are found between the metals and non-metals in the periodic table.
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where are the reproductive parts of plants located?leaves,flower,roots, stem
The reproductive part of plants is located in flowers.
The flowers are the reproductive part of a plant.
Stamens are the male reproductive part.
The pistil is the female reproductive part.
Process of reproduction in a plant:
Pollen is transferred from one flower to another by insects or the wind. Pollination is the name given to this procedure.When pollen enters a fresh flower, it moves to the ovary where it fuses the ovules, the egg cells that become seeds, to produce seeds.Animals or the wind can disperse the seeds.To know more about reproduction in a plant refer to:
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chemistry is the discipline that studies a) various forces of the physical world. b) electrical charges. c) the composition of matter and how it changes. d) the interaction of elements and living organisms.
Option c . The composition of matter and how it changes.
What is chemistry ?Chemistry is the study of matter, including its composition, characteristics, and processes of change. Chemistry is the ability to explain the components of a cake and how they alter throughout baking.Everything that is physically real and has mass and takes up space is considered to be matter. Some things, like this book, are clearly identifiable as being made of matter. Some are more subtle. We occasionally forget that the air is also made of matter since we move through it so readily.One type of science is chemistry. By observing, testing, and then developing models that account for our observations, science is the process by which we learn about the natural world.Learn more about chemistry refer to :
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If 7.34 mol of O2 reacts, calculate the grams of CO2 produced.CH4 + 2O2—> CO2 + 2H2O
Answer:
[tex]161.48\text{ g}[/tex]Explanation:
Here, we want to get the mass of carbon (iv) oxide produced
From the question, we have the balanced chemical reaction stating that 2 moles of oxygen molecule produced 1 mole of carbon (iv) oxide molecule
The number of moles of carbon (iv) oxide produced from 7.34 mol oxygen is thus:
[tex]\frac{7.34\times1}{2}\text{ = 3.67 moles}[/tex]1 mole of carbon (iv) oxide contains 44 g
The mass in 3.67 moles will be:
[tex]44\times3.67\text{= 161.48 g}[/tex]1.40 L solution was made by mixing 69.3 mL of dioxane, Which has a density of 1.03 g/mL, and 1.3 L of Toluene, Which has a density of 0.87 g/mL. Calculate the volume percent of dioxane in the solution. Be sure your answer has the right number of significant digits.? %(v/v)
To calculate the volume percent of dioxane we will apply the following formula:
[tex]Volumepercent=\frac{\text{Volume of solute}}{Volume\text{ of solution}}\times100[/tex]In this case, the solute will be dioxane, and the volume will be 69.3 mL.
To calculate the volume of solution we will sum both volumes:
Volume of solution = Volume of dioxane + Volume of Toluene
Volume of solution = 69.3 mL + 1300 mL
Volume of solution = 1369.3 mL
[tex]Volumepercent=\frac{\text{6}9.3\text{ mL}}{1369.3\text{ mL}}\times100\text{ = 5.1}[/tex]We are given all the data with a significant digit, therefore we must report the result also with a significant digit. So the answer will be.
The volume percent of dioxane in the solution is 5.1 %(v/v)
The diagram below represents the reproductive cycle of a squirrel species with 40 chromosomes in each zygote.
A process that could be represented by letter A in the given diagram is
B) meiosis
A) mitosis
C) mutation
D fertilization
A process that could be represented by the letter A in the given diagram is fertilization. The correct option is D.
What is a reproductive cycle?It goes through four stages: menstrual, regenerative, proliferative, and secretory. The cycle duration is the time it takes from the first day of one menstruation to the first day of the following menstruation; most usual cycles last 28 days, but it can range from 21 to 40 days.
The average cycle lasts 28 days; however, cycles can last anywhere from 21 to 35 days. The menstrual cycle is triggered by the rise and fall of chemicals in your body known as hormones.
Therefore, the correct option is D, fertilization.
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describe and explain relationships between reactants and products in chemical changes that occur in the oceanic environment.
Scientists refer to the long-term alteration in ocean chemistry caused by CO2 absorption from the environment as ocean acidification.
The reaction can be expressed as:
[tex]CO_{2}[/tex] + [tex]H_{2} O[/tex] → ([tex]H^{+}[/tex]) +. ([tex]HCO3^{-}[/tex]).
Ocean acidification is a process that happens when the water absorbs too much carbon dioxide. In the equation, [tex]CO_{2}[/tex] represents carbon dioxide. The [tex]CO_{2}[/tex] in the equation represents the water molecules in which the carbon dioxide reacts.
Ocean acidification is the term for a long-term decrease in the ocean's pH that is mostly brought on by the ocean's absorption of carbon dioxide ( [tex]CO_{2}[/tex]) from the atmosphere.
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Order the following elements by increasing ionization energy
Si
Mg
Ci
Ar
Answer: yes
Explanation: no
Is this balanced?
Equation
2 H₂ + 1 o₂ ➪2 H₂O
Yes, the eqⁿ is balanced.
Explanation:
The reaction between hydrogen and oxygen results to the formation of water.
[tex]{ \purple{ \sf{2 H₂ + 1 \: O ₂ \: ➪ \: 2 H₂O}}}[/tex]
To check whether the eqⁿ is balanced, let us count the numbers in the reactant and product sides
L.H.S.
H = 2×2 = 4.
O = 2×1 = 2.
R.H.S.
H = 2×2 = 4
O = 2×1 = 2.
Hence it is a balanced chemical equation.
Answer : yes ,it is balanced so your answer should look like this with the state symbols
2H2(g)+O2(g)→2H2O(l)
Chemical equations Help pleaseeeeee
Fill in the table with the mass of each sample. Use the periodic table to find the molar mass of each compound. Then calculate moles and particles. Periodic TableThe two compounds have the same number of moles. Compare how the number of moles relates to the masses and number of particles for each compound.
1) First, let's calculate the molar mass of NaCl and CoCl₂:
Atomic mass of:
Na - 22.99 g/mol
Cl - 35.45 g/mol
Co - 58.93 g/mol
So for NaCl:
22.99 + 35.45 = 58.44 g/mol
Molar mass of NaCl = 58.44 g/mol
For CoCl₂:
58.93 + (2x35.45) = 129.83 g/mol
Molar mass of CoCl₂: 129.83 g/mol
2) Now let's find out the number of moles of each sample. For this, we use the following equation:
moles = mass / molar mass
NaCl:
mole = 116.8 / 58.44
mole = 1.999 moles of NaCl
CoCl₂:
mole = 259.7 / 129.83
mole = 2.000 moles of CoCl₂
3) To find the amount of particles, we use the Avogadro's constant. Avogadro's constant is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons.
In this case, we have the same number of moles, so we will have the same number of particles for both NaCl and CoCl₂.
an amino acid that forms a solution with a ph of 3.0 as it is dissolved in distilled water has a side chain with what functional group?
An amino acid that forms a solution with a ph of 3.0 as it is dissolved in distilled water has a side chain with a carboxyl group.
A carbonyl and hydroxyl group are joined by a carbon atom to form a carboxyl group. The hydroxyl group is made up of oxygen and hydrogen bound together, whereas the carbonyl group is a carbon double-bonded to oxygen (O=H) (OH). The carboxyl functional group, also known as the carboxyl group, is produced when the carbon atom is attached to both the hydroxyl and carbonyl functional groups.
This characteristic enables this functional group to bind to a variety of molecules that are present in typical goods. As a result, a molecule made up of a carbonyl and a hydroxyl group joined by a carbon atom is described as having a carboxyl group.
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C6H12O6 + 6 O2(g) 6 CO2(g) + 6 H2O(g)
If 7.5 g of glucose react with 5.5 L of oxygen, which one is the limiting reagent?
C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen, the limiting reagent is glucose.
The balanced reaction is given as :
C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O
mass of glucose = 7.5 g
molar mass of glucose = 180 g/mol
number of moles =mass / molar mass
= 7.5 / 180
= 0.041 mol
volume of oxygen = 5.5 L
density of oxygen = 1.42 g/ml
mass = density × volume
mass = 1.42 × 5.5
mass = 7.81
moles = mass / molar mass
= 7.81 / 32
= 0.244 mol
mass of reactant from each product:
now, glucose , mass of CO₂ = 0.041 × 6 × 44 = 10.84 g
oxygen, mass of CO₂ = 0.244 × 6 × 44 = 64.41 g
Since glucose gives the smaller amount of product glucose is a limiting reagent.
Thus, C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen, the limiting reagent is glucose.
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what is the wavelength of light if the frequency is 7.0*10^16 Hz
49 becase you multilpy it
Explanation:
why are mixtures and compounds different
Answer:
Mixtures are formed by mixing two or more substances physically such that no chemical reaction takes place between the components.
How many electrons are found in the first energy level of phosphorus
Answer:
15 electrons
Explanation:
how many grams of chloroethane are needed to produce 5 moles of ethylamine from ammonia if the reaction yield is 67%?
Answer:
This reaction is reversible, and you will only get significant amounts of the free amine if you use a large excess of ammonia. The product as a nucleophile.
Explanation:
What is the standard entropy change for the combustion of 1 mole of diamond at room temperature?.
Diamond's standard enthalpy is zero at 298 K and 1 atm of pressure.
What is standard entropy change?Any crystalline substance has zero entropy at 0 K, with the slight exception of the influence of crystal flaws. That contains diamond and graphite.To calculate the reaction's enthalpy, S°, add up the absolute entropies of the reactants and products and subtract them from one another. Then, multiply each result by the relevant stoichiometric factors.The difference between the sum of the molar entropies of the products and the sum of the molar entropies of the reactants can be used to calculate the change in the standard molar entropy of a reaction.You can use the equation shown below. ΔSo=ΣnSo(products)−ΣnSo(reactants) The difference between the total standard entropies of the products and the total standard entropies of the inputs is the standard entropy change.To learn more about standard entropy change refer to:
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Look at the data in Figure 1. Fresh water has a salinity close to 0%. What is the surface tension for fresh water?
Answer: It appears as though fresh water has a surface tension of 72.5 mN/m
Explanation: Since fresh water does not have a high concentration of salt, and pure fresh water has no salt at all, you are trying to find the value of surface tension at 0% salinity. At 0% salinity, the surface tension value is 72.5 mN/m
Objective: Utilize units (dimensional analysis) as a guide to problem solving. Apply the concepts of mole
and stoichiometry to aqueous solutions and gases.
Question: For the reaction SrCO (s) + 2HCl(aq) → SrCl₂(aq) + CO₂(g) + H₂O(l), what volume of carbon
dioxide gas, measured at 1.05 atm and 298 K, may be produced by the reaction of 25,0 mL of 0.1072 M
HCI with excess strontium carbonate?
Include definitions, explanations, discussion of problem-solving process.
The volume of carbon dioxide gas produced will be 23.3mL
SrCO (s) + 2HCl(aq) → SrCl₂(aq) + CO₂(g) + H₂O(l)
Here concentration of the strontium carbonate is in excess and the concentration of HCl is 25mL having molarity 0.1072 M
Number of moles of HCl= mass/ molar mass,
Molar mass of HCl= mass/ Number of moles
Molar mass of HCl= 36.5
Mass of HCl from balanced equation= 2×36.5=73
Molarity= Number of moles/ volume
According to stoichiometry the moles of HCl is 2 and that of CO₂ is 1.
We know that,
PV =nRT
1.05× V= 1 ×0.0821× 298
V= 0.0821×298/ 1.05
= 23.3 mL
By ideal gas equation, volume of carbon dioxide is calculated as 23.3 mL.
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when a piece of wood is on fire how is that fired created through a chemical reaction ?
Jillian is looking over a Safety Data Sheet (SDS) for a pesticide at work. She notices it has the exclamation point pictogram shown below. What does this pictogram mean?
A red diamond with an exclamation mark inside
Chemicals that could cause toxicity to fish and other aquatic life
Chronic hazard that comes from long-term exposure
Health hazard that is less severe
Toxic poisoning after brief exposure
Answer:
This symbol indicates that hazardous products with this pictogram can cause certain health effects for example, skin irritation, eye irritation, and/or. skin sensitization.
Explanation:
Infer the silica content of magma derived from partial melting of an igneous rock. Would it be higher, lower, or about the same as the rock itself? Explain
The silica content of magma derived from partial melting of an igneous rock is higher than the rock itself.
The composition of magma is depends upon the two factor : rock , that is melted to form the magma and the conditions in which magma is melted. In partial melting , some of the minerals are melted in the rock. The different minerals have the different melting points. The mineral which is higher in silica have lower melting point. so, Partial melting produce more silica as compared to the original one.
Thus, The silica content of magma derived from partial melting of an igneous rock is higher than the rock itself.
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suppose you add 20 ml of water and 20 ml of 0.50 g/l ca(oh)2 into a bottle. what is the concentration of ca(oh)2 in the bottle?
0.25g/L is the concentration of Ca(OH)2 in the bottle when 20 ml of water and 20 ml of 0.50 g/l Ca(OH)2 is added into a bottle.
What is Concentration?Concentration in chemistry is the measure of the constituent divided by the volume of the mixture.
What is Ca(OH)?Ca(OH)2 stands for Calcium hydroxide formed by the action of water on the calcium.it is used in forming a solution ,named limewater. it is also called as Slaked lime
Acc. to the given data:
c1=0.50g/l
v1=20ml=0.020L
c2=?
v2=20ml+20ml=40ml=0.040L
now we use the equation
c1v1=c2v2
rearranging the above equation
c2=c1*v1/v2
putting values
c2=0.50*0.020/0.040
c2=0.25g/l
Hence, 0.25g/L is the concentration of Ca(OH)2 in the bottle when 20 ml of water and 20 ml of 0.50 g/l Ca(OH)2 is added into a bottle.
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If 3.4 atm of a gas at 644.4 K is compressed to 11.6 atm at constant volume. What is the new pressure of the gas?
The temperature in the final pressure formation is 2201.13K and the change in the pressure is 8.2atm
It is given that the initial pressure of the gas P₁ is 3.4atm and the initial temperature is T₁ 644.4K the final pressure of the gas is 11.6 atm. To find the final temperature, According to Gay Lussac's Law,
P₁/T₁ = P₂/T₂
On substituting the values of P₁,T₁ and T₂ we get,
3.4/644.4 = 11.6/T₂
0.005276 = 11.6/T₂
T₂ = 11.6/0.005276
T₂ = 2201.13K
Therefore the final temperature T₂ is 2201.13K when the pressure is changed from 3.4 atm to 11.6 atm
Thus the pressure change is calculated by,
ΔP = P₂ - P₁
ΔP = 11.6 - 3.4
ΔP = 8.2 atm
The change in pressure is 8.2atm
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Why do isotopes undergo radioactive decay?
Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.
Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.
Three Types of Radioactive Decay:
Alpha Decay:
When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.
Beta Decay:
A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.
Gamma Decay:
The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.
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Given the following unbalanced equation: KClO3 -> KCl + O2A) how many molecules of O2 can be produced by letting 12.00 moles of KClO3 react?B) how many moles of KCl can be produced by letting 4 moles of KClO3 react?
Step 1: Balance the equation
To balance the equation it is necessary to have the same number of atoms of each element on both sides of the equation (reactant side and product side). Let's count the number of atoms of each element for the unbalanced equation: KClO3 -> KCl + O2
Reactant side:
K - 1
Cl - 1
O - 3
Product side:
K - 1
Cl - 1
O - 2
To balance the equation, we need to fix the number of atoms of O on the product side, let's add a 3/2 in front of it:
KClO3 -> KCl + 3/2 O2
The equation is balanced but 3/2 is not an integer. So let's multply all the equation by 2:
2 KClO3 -> 2 KCl + 3 O2
Now the equation is balanced.
A) To solve this, we need to use the ratio between O2 and KClO3. It is 3:2.
so:
3 moles of O2 ---- 2 moles of KClO3
x moles of O2 ---- 12 moles of KClO3
x = 18 moles of O2
We found the number of moles, the question asks us the number of molecules.
For this, we need to use the avogadro's constant:
6.022x10^23 molecules ---- 1 mol
x molecules ---- 18 moles
x = 1.1 x 10^25 molecules of O2
B) To solve this we use the ratio between KCl and KCl3. It is 2:2
So it is produced 4 moles of KCl when 4 moles of KClO3 react.
3) According to internet sources
the Moon has an equatorial
VectorStock
radius of 1738.14 km and a polar radius of 1735.97 km.
What information can you tell me about these
measurements just by looking at the numbers? How many
miles do these numbers represent? Is the moon a perfect
sphere? How confident are you in your answer?
Vector. PLEASE HELP MEE
According to internet sources the Moon has an equatorial VectorStock radius of 1738.14 km and a polar radius of 1735.97 km and the miles do these numbers represent 2.17km and yes moon a perfect sphere
Miles is a unit of distance equal to 1760 yards or approximately 1.6 kilometers
Here given data is
Moon has an equatorial VectorStock radius of 1738.14 km and a polar radius of 1735.97 km then the miles are
1738.14 km - 1735.97 km = 2.17km
2.17 km miles do these numbers represent? Is the moon a perfect sphere
And the moon is the perfect sphere
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classify the following as a heterogeneous mixture (suspension), homogeneous mixture (solution), or colloid: hot tea with lemon
Hot tea with lemon is classified as a homogeneous mixture as once the two components are mixed they maintain uniform composition through out the mixture.
The mixtures can be classified broadly into 3 types:
(on the basis of composition)
homogeneous
heterogeneous
colloids
Homogenous mixtures are those mixtures in which the composition of the mixture is uniform throughout the mixture.
Hetrogenous mixtures reffer to those mixtures where the composition of does not remain uniform through out the mixtures. These can consists two or more compounds in differet phases.
A colloid is a mixture of particles that are too big when compared to the atom but still are invisible to the direct eye. The particles present in a colloidal mixture range from 1 to 1000 nanometers in diameter
Hot tea with lemon is classified as a homogeneous mixture as once the two components are mixed they maintain uniform composition throughout the mixture.
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Decompositionof ammonium nitrate produces water and di nitrogen oxide. a) Predict how many grams of water will be produced from decomposition of 0.555 kg of ammonium nitrate.b) If 120. g of water is actually produced, what is the percent yield for this reaction
NH4NO3(s) ==> 2 H2O(g) + N2O (g) (balanced)
a) We need the molar masses for each compound:
NH4NO3 = 80.0 g/mol (ammonium nitrate)
H2O = 18 g/mol (water)
0.555 kg => 1 kg = 1000 g => 0.555 kg = 555 g
80.0 g NH4NO3 -------- 2 x 18 g H2O
555 g NH4NO3 -------- X = 250 g
Answer a): 250 g water
b) % yield of water
120. g of water = actual yield
250 g of water from a) is the theoretical yield
Therefore, the % yield:
% yield = (actual yield/ theoretical yield) x 100
% yield = 120. g water/250 g water x 100
% yield = 48 %
Answer b): % yield = 48 %