The given chemical reaction is :
Calcium Oxide (s) + Water (l) → Calcium Hydroxide (s)
Molecular Changes : A chemical reaction is one in which the replying substances experience changes at the molecular position. This means that bonds between tittles of the reactants are broken, and tittles are changed or rearranged to produce commodity new. Chemical reaction can be reversible or unrecoverable.
What happens when frying an egg ?
Frying an egg is a chemical response. It's an illustration of an endothermic response or bone that takes in heat to make the response do. An egg is made up of proteins and water, and the thralldom also contains fat. When an egg is hotted , the proteins begin to change their structure. Protein motes are veritably complex, made up of long chains of structure blocks called amino acids. These chains are also folded and twisted to make complicated molecular structures. Hotting the egg adds energy, which causes the motes to begin to move and lose their shape. Bonds holding the shape of the protein motes together begin to break, unfolding the proteins and allowing them to spread out. New bonds are formed, and water evaporates out of the egg, changing it into a semi-solid. The egg has experienced anon-reversible chemical response, as it can not be changed back into its raw state.
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Concerning the rate law, Rate = K[A]²[B], what are appropriate units for the rate
constant k?
The correct answer is M^-1s^-1.
The proportionality constant in the rate law expression, known as the rate constant or the particular rate constant, represents the relationship between the rate of the reaction and the concentration of the reacting species. Because it equals the rate of the reaction when the concentration of the reactants is assumed to be unity, it is known as the specific rate constant. The speed and direction of a chemical reaction are measured by a reaction rate constant. We are aware that the values of the Rate constant vary with temperature.
The given rate law is:
Rate = k[A][B]
The units of rate are always Ms^-1 and the units of [a] are mol so: mol*s^-1
Putting the units in the given rate law:
Rate = k[A][B]
Ms^-1=k×(M)×(M)
k=Ms^-1/M^2
k=M^-1s^-1
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How does the curing basically take place?
Explanation:
The first involves keeping the surface of the concrete moist by the use ponding, spraying/sprinkling, damp sand or damp hessian.
The second prevents the loss of moisture from the concrete by covering it with polythene sheeting or leaving the formwork in place.
The third involves the use of spray or roller applied curing compounds.
A pediatric patient with a body mass of 75 pounds is prescribed Rohypnol for arrhythmia. The recommended dose is 3 mg per kilogram per day given in divided doses every six hours how many milligrams of propanol should be given for each dose
The milligrams of propanol should be given for each dose is 101.25 mg.
How much should be given for each dose?We know that drug is a chemical that is taken into the body to achieve a particular end which is to stop sickness. The amount at which drug should be given is called the dose of the drug.
The mass of the patient is 75 pounds we have to convert this weight to kilograms.
1 pound = 0.45 Kg
75 pounds = 75 pounds * 0.45 Kg/1 pound
= 33.75 Kg
If the dose is 3 mg per kilogram then;
3 mg should be given for 1 kilogram of body mass
x mg should be given for 33.75 Kg of body mass
x = 3 mg * 33.75 Kg / 1 kilogram
= 101.25 mg
Hence, milligrams of propanol should be given for each dose is 101.25 mg.
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Tell how many protons, neutrons, and electrons 39_K 1_H contains ?
19 protons, 20 neutrons and 18 electrons.
Every atom has a proton, a subatomic particle, in its nucleus. The particle is electrically charged positively.Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle.A negatively charged subatomic particle known as an electron can either be free or attached to an atom.The protons are determined by the atomic number (19).
therefore, number of proton = 19
The protons and neutrons together make up the atomic mass.
P + N = 39
19 + N = 39
number of neutrons = 39 - 19 = 20
A neutral atom has an equal number of protons and electrons. The negative charge is the same as the positive charge. The number of electrons represents the negative charge. The charge of this ion is +1. Therefore, find the negative charge.
= -19 + 1 = -18
therefore, number of electrons are 18.
Thus, no. of proton = 19
no. of neutrons = 20
no. of electrons = 18
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1. Use the following information to answer 3 questions. When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:
2KClO3(s) → 2KCl(s)+ 3O2(g)
If 12.25g potassium chlorate decomposes, how many grams of oxygen will be release?
(A) 1.60 g (B) 3.20 g
(C) 4.80 g (D) 18.37 g
4.80 grams of oxygen will be release.
When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:
2KClO3(s) → 2KCl(s)+ 3O2(g)
mass of potassium chlorate = 12.25g
mole of KClO3 = 12.25/122.5 = 0.1 mol
2 mole KClO3 (consumed) = 3 mole O2 (produced)
1 mole KClO3 = 3/2 mole O2
0.1 mole KClO3 = 0.1*1.5 mole O2
= 0.15 mole O2
mass of O2 = 0.15 * 32 = 4.80 grams
4.80 grams of oxygen will be release.
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10) A graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added, the graduated
cylinder has a mass of 120 g. If a rock is added to the graduated cylinder, the water level rises to 75
mL and the total mass is now 250 g. What is the density of the rock?
M=
V=
D=
The rock would weigh 2.89 grams per milliliter.
It is the mass of anything or body per unit volume of that specific object or body.
Equals volume / mass
A graduated cylinder has a mass of 50g when empty, as stated in the problem. The graduated cylinder has a mass of 120g after 30 mL of water have been added.
The rock weighs 250 grams, or 130 grams.
the rock's volume is equal to 75 milliliters minus 30 milliliters, or 45 milliliters.
Mass of the rock divided by volume equals 2.89 grams per milliliter, which is the density of the rock.
As a result, the rock has a density of 2.89 grams per milliliter.
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What is the overall chargeon particles with the subatomic makeups given if there are3 protons, 3 neutrons, and 2 electrons?
Answer:
+1
Explanation:
The neutrons do not affect the overall charge of the particle. Protons have a positive charge and electrons have a negative charge. Since the protons outnumber the electrons by one, there is an overall charge of +1.
Here is a more in depth explanation: if there are 3 protons, each which have a value of +1, the protons contribute a +3 charge. If there are 2 electrons, each which have a value of -1, the electrons contribute a -2 charge. When you add these two charges, you are left with an overall charge of +1 (+3 + (-2) = +1).
who said electrons move around the nucleus billions of times in one second
Answer:
it's Heisenberg Einstein
Explanation:
Heisenberg Einstein & other scientists
Electrons move around the nucleus billions of times in one second. There are small, negatively charged particles inside an atom called electrons. “Atomos” means “not to be cut,” which refers to the smallest piece of matter.
Answer:
Heisenberg Einstein
Explanation:
they where the main one but there where a few others who agreed
Calculate the mass of potassium hydroxide, KOH, required to prepare 174.59 cm3 of a 0.864 mol dm-3 solution.
Taking into account the definition of molar concentration and molar mass, the mass of potassium hydroxide, KOH, required to prepare 174.59 cm³ of a 0.864 mol/dm³ solution is 8.45988 grams.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
Molarity= number of moles÷ volume
Definition of molar massThe molar mass of substance is defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of potassium hydroxideIn this case, you know that:
Molarity= 0.864 mol/dm³Volume= 174.59 cm³= 0.17459 dm³ (being 1 cm³= 0.001 dm³)Replacing in the definition of molar concentration:
0.864 mol/dm³= number of moles÷ 0.17459 dm³
Solving:
0.864 mol/dm³ ×0.17459 dm³= number of moles
0.1508 mol= number of moles
The molar mass of KOH is 56.1 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 56.1 grams, 0.1508 moles of the compound contains how much mass?
mass= (0.1508 moles×56.1 grams)÷ 1 moles
mass= 8.45988 grams
In summary, the mass of potassium hydroxide, KOH, required to prepare 174.59 cm³ of a 0.864 mol/dm³ solution is 8.45988 grams.
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A car is traveling 65.0 miles per hour. Convert this to meters per second.
Answer:
29.0576
Explanation:
To convert miles per hour to meters per second you divide the speed value by 2.237.
A 0.4042 g sample of a pure soluble bromide compound is dissolved in water, and all of the
bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of
the resulting AgBr is found to be 0.6797 g.
What is the mass percentage of bromine in the original compound?
%
70.80 % is the mass percentage of bromine in the original compound.
Mass of AgBr = 0.6797 g
Moles of AgBr = 0.6797 g / 187.77 g/mol
= 0.0036198 mol
Silver Nitrate + Bromine ---------> Silver Bromide + Nitrate
According to reaction, 1 mole of AgBr is obtained from 1 mole of bromide ions , then 0.0036198 moles of AgBr will be formed from :
1/1 * 0.0036198 mol = 0.0036198 mole of bromide ions
Mass of 0.0036198 moles of bromide ions :
0.0036198 moles * 79.09 g/ mol
= 0.2862 g
Mass of the sample = 0.4042 g
Mass percentage = 0.2862 * 100 / 0.4041
Mass percentage (%) = 70.80 %
Hence, the mass percentage of bromine in the original compound is 70.80%
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Can you please help me
Answer: true
Explanation:
How many moles of calcium do you have if you measure out 19.13 g of calcium?
Enter your answer in decimal form with the correct number of sig figs. Use the proper abbreviation for the units.
145 lb adult takes 200 mg tablet is equal to ug per kg
The calculated medication dose is 3.010³g/kg
Patients receive medications either as a dosage or as a single dose. These two terms have various connotations. A dosage is a set amount of medication administered all at once. It is a singular value for mass or volume. It can alternatively be described as the mass or volume of the medicine divided by the patient's body weight. A drug's dosage is the precise quantity, number, and frequency of doses given over a precise period of time.
The dose (one time) of medication for an adult patient is the subject of this question. The patient mass is given in pounds, and the drug mass is supplied in milligrams; m drug = 200 mg
145 lbs., patient
In order to respond to this query, we convert the patient's mass to kilograms and the drug mass to micrograms:
Drug = 200 mg, 10³ mg, and 2.00, 10⁵ g
145 lb patient = kg/2.20 lb = 65.9 kg
The medication dose is:
mdrug Mpatient = 2.0010⁵g/65.9kg
= 3.010³g/kg
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the kind of light coming from a substance
Draw the structural formula for cis-1,3-dimethylcyclopentane
Aliphatic compounds, on the other hand, are organic substances whose carbon atoms link with one another in open chains, either straight or branched, as opposed to containing a benzene ring. Aromatic compounds are organic substances with a planar unsaturated ring of atoms that is stabilized by an interaction of the bonds forming the ring. As a result, the primary distinction between aromatic and aliphatic chemicals is that aromatic compounds lack a cyclic structure while aliphatic compounds have straight, branching, or cyclic structures. Additionally, while the majority of aliphatic molecules are odorless, all aromatic compounds have a sweet, pleasant fragrance.
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why do we have to multiply the atomic mass of the oxygen to get 32?
Consider the atom with the chemical symbol Ru.
What would be the mass number for an atom of Ru which has 53
neutrons?
Answer: 97
Explanation:
The element Ru is Ruthenium which has 44 protons.
In this case, our atom is an isotope with 53 neutrons.
With this information, we can use the mass number formula to find this atom's mass number.
mass number = protons + neutrons
mass number = 44 protons + 53 neutrons
mass number = 97
When methane is burned with oxygen the products are carbon dioxide and water. If you produce
14 grams of water and 16 grams of carbon dioxide from 8 grams of methane, how many grams of
oxygen were needed for the reaction?
Questions
Q1.
Use the Periodic Table on page 2 to help you answer this question.
Give the name or symbol of
(a) the element in group 3 and period 4.
Gallium is the element that belongs to the group 3 and the fourth period. Ga is symbol of Gallium.
The element gallium has an atomic number of 31.While highly pure gallium is covered in a dazzling silvery colour, solid gallium is a blue-grey metal with an orthorhombic crystalline structure.It is a crucial part of numerous semiconductors. Due to its capacity to transform power into light, it is additionally used in red LEDs (light emitting diodes).Because of its high boiling point, it is perfect for recording temperatures that would cause a thermometer to vaporise.From iron pyrites, zinc blende, germanite, and bauxite, this metal can be readily removed as a byproduct.Because gallium is a corrosive chemical, it can cause serious skin and eye burns asse well as significant irritation.Learn more about semiconductors here
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A Patient with family history of a hematologic condition is being seen by a nurse. What assessment funding needs additional assessment for the condition.
Nursing needs assessments involve gathering subjective and factual information, including the patient's psychosocial history, family history, surgery history, medical history, and medication history.
Introduction Hematologic diseases, sometimes known as blood disorders or disorders of the blood-forming organs, affect millions of Americans. Hematologic diseases, in addition to blood cell tumors, also include rare genetic disorders, HIV-related ailments, sickle cell disease, anemia, and side effects from chemotherapy or blood transfusions.
In hematologic disorders, the genetic condition is passed from parents to their offspring.
Hemoglobin can be aberrant in numerous ways.
a condition like sickle cell anemia, thalassemia.
Certain blood disorders are brought on by a decrease in red blood cell formation.
• Nursing needs assessments involve gathering subjective and factual information, including the patient's psychosocial history, family history, surgery history, medical history, and medication history.
• The patient's family should also be checked for similar disease patients, and accurate disease-related data must be gathered.
• From time to time, thoroughly review all of the patient's reports. Which the patient reported early.
Using clinical judgment, do an analysis or diagnosis to determine the patient's condition and identify the primary causes.
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Rene grew bacteria from mouth on special plates in the lab she placed drops of different mouthwashs on bacteria on each plate
The correct answer is Test the hypothesis with an experiment.
Rene grew bacteria from mouth on special plates and now she is conducting a research on those bacterias by dropping different mouthwash on them to find out effect of mouthwashes on bacteria. This comes under the category of test the hypothesis with an experiment. When performing experiments and investigating observations, the scientific method is a technique that is used.This method's objective is to identify the connections between cause and effect in diverse contexts and applications.There are total seven steps of scientific method:Ask the questionPerform research Establish your hypothesisTest your hypothesis by conducting experimentMake an observation Analyse the result and draw the conclusionPresent the findingsThe key goal of 4th step is to gather information and facts to test our idea.
Therefore, Rene is on the 4th step of scientific method.
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Is time a property of matter?why is it important to measure time?
In accordance with this view, time is locally generated and a property of matter since time at its most basic level is made up of the frequency oscillations of matter particles.
Time flows and flows like a river. Time moves forward and has a direction. One thing follows another in time. There is a definable duration to time, a space between events. Time was defined as a physical entity by Einstein's general theory of relativity because it is a component of space-time, the gravitational field created by large objects. Time moves more slowly when a mass like the Earth is nearby because the existence of mass warps space-time.
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Please help with this question
Answer:
You would use the meter stick on the right
Explanation:
The meter stick on the right has the little lines to see the decimal for a more accurate measure while the other you would have to guess.
Currently, 118 elements are listed on
the periodic table. One thing that each
of these elements has in common is
that they are composed of what?
A. Carbon
B. Energy
C. Atoms
D. Mixtures
Answer:
C
Explanation:
Because they 2 or more atoms
Describe how you prepare 2.00L of each of the following solutions. 0.250 M NaOH from Solid NaOH
To prepare 2.00 L of 0.250 M NaOH from solid NaOH, dissolve 20 g of NaOH in 2.00 L of water to form 0.250 M NaOH solution.
A stock solution is a solution with high concentration of any particular solute and it is used for obtaining moderate quantities of solute using small volumes.
Sodium hydroxide is a strong electrolyte with the molecular formula NaOH. Sodium hydroxide completely dissociates in aqueous solution to produce Na⁺ and OH⁻ ions. Hence, sodium hydroxide is considered to be a strong base. Sodium hydroxide, also called caustic soda, is highly hygroscopic in nature.
Firstly, we will prepare a stock solution, by placing n grams of NaOH in a liter volumetric flask. Then add 100 mL dilute water and make up the volume of solution to 1 liter.
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What is the weight percent (w/w%) of a solution prepared by dissolving 15.0 g of sugar into 50.0 g of water?
Answer:
23.1%
Explanation:
To find the weight percent (aka. mass percent), you need to use the following equation:
mass of solute (g)
Weight Percent = ---------------------------------- x 100%
mass of solution (g)
In this case, the solute is sugar and the solution is the sugar and water. You can find the weight percent by plugging the given values into the equation and solving. The final answer should have 3 sig figs like the given values.
mass of solute = 15.0 g
mass of solution = 15.0 g + 50.0 g = 65.0 g
15.0 g solute
Weight Percent = ------------------------- x 100%
65.0 g soln
Weight Percent = 0.231 x 100%
Weight Percent = 23.1%
Define global warming potential
Answer:
Global warming potential (GWP) is the heat absorbed by any greenhouse gas in the atmosphere, as a multiple of the heat that would be absorbed by the same mass of carbon dioxide (CO 2).
A weak acid has a molar mass of 162 g mol-1. Analysis of a 0.8821 g sample showed the composition by mass is 0.0220 g H, 0.3374 g P, and the remainder to be O. Determine its empirical and molecular formula.
Empirical
Molecular
1. The empirical formula of the weak acid is H₂PO₃
2. The molecular formula of the weak acid is H₄P₂O₆
Data obtained from the question Mass of compound = 0.8821 gH = 0.0220 gP = 0.3374 gO = 0.8821 - (0.0220 + 0.3374) = 0.5227 gEmpirical formula =? Empirical formula =? Molecular formula =?1. How to determine the empirical formulaThe empirical formula of the compound can be obtained as follow:
Divide by their molar mass
H = 0.0220 / 1 = 0.022
P = 0.3374 / 31 = 0.01
O = 0.5227 / 16 = 0.03
Divide by the smallest
H = 0.022 / 0.01 = 2
P = 0.01 / 0.01 = 1
O = 0.03 / 0.01 = 3
Thus, the empirical formula of the compound is H₂PO₃
2. How to determine the molecular formula Empirical formula = H₂PO₃Molar mass of compound = 162 g/molMolecular formula =?Molecular formula = empirical × n = mass number
[H₂PO₃]n = 162
[(1×2) + 31 + (16×3)]n = 162
81n = 162
n = 162 / 81
n = 2
Molecular formula = [H₂PO₃]n
Molecular formula = [H₂PO₃]₂
Molecular formula = H₄P₂O₆
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As wind blows up the windward side, sand grains may be picked up and blown toward the top. Then grains may drop, allowing them to slip down the leeward side. What event is this describing?
1: Desertfication
2: Deposition
3: Dune movement
4: Drought of farmlands
The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
What is Dune movement?
The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.
If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.
Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
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