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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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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A molecular biologist measures the mass of cofactor A in an average yeast cell. The mass is 90.2 pg. What is the total mass
in micrograms of cofactor A in a yeast colony containing 10^5cells?
The total mass in micrograms of cofactor A in a yeast colony containing 10^5cells is 2.47 ug.
As a cofactor for several oxidative and biosynthetic activities in intermediate metabolism, coenzyme A (CoASH) has a distinct function. When acyl-CoA thioesters are produced from organic carboxylic acids, the acid is activated for additional biotransformation processes and enzyme recognition is facilitated.
A coenzyme is an organic, non-protein molecule that an enzyme needs in order to carry out its catalytic function. An enzyme is a protein that serves as a catalyst to speed up biological reactions without changing itself in the process.
24.7 pg./cell x 105 cells x 1 ug/106 pg.
= 24.7x10-1 ug
= 2.47 ug
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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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235 miles converted to kilometers
Answer:
378.196
Explanation:
235 miles = 378.196 Kilometers
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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Complete this analogy: Competition is to ____________as_
is to food webs. *
Answer:
Competition occurs when individuals of different species struggle to obtain the same resource in an ecosystem (such as food or living space). Adaptations, such as physical mutations and behavior modifications, can help an organism outcompete its competitors.
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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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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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
what percentage of a sample is remaining if you use the decimal (0.2536) and the fraction (3/7) of that sample
The percentage left is 57%.
What is the percentage remaining?We know that a fraction is a part of a whole. Let us in this case take the whole as one and then the fraction that we remove out of it is 3/7. We now have to find the percentage that remains.
Thus'
Fraction that remains = 1 - 3/7 = 4/7
Hence;
Percentage that is left = 4/7 * 100
= 57%
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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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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
Madison lives near the ocean. She’s formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. If Madison plans to test this hypothesis, she will have to deal with the following variables in her experiment
In her experiment, she will have to deal with the following elements Amount of metal corrosion⇒ Airborne Salt Concentration⇒ Air Temperature.
What are the different types of corrosion?Uniform corrosion, pitting, crevice corrosion, filiform corrosion, galvanic corrosion, environmental cracking, and fretting corrosion are just a few of the various types of corrosion that may be seen with the unaided eye. Let's examine how these types of corrosion develop and how carbon steel can be harmed by them.
What causes corrosion?When a metal reacts with something else, such oxygen, hydrogen, an electrical current, or even dirt and germs, it corrodes. When metals like steel are subjected to excessive strain, which causes the substance to split, corrosion can also occur.
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The complete question is -
Select the correct answer from each drop-down menu.
Madison lives near the ocean. She's formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. If Madison plans to test this hypothesis, she will have to deal with the following variables in her experiment:
Dependent variable: [AIR HUMIDITY/AIR TEMPERATURE/AMOUNT OF METAL CORROSION]
Independent variable: [AIRBORNE SALT CONCENTRATIONS/VOLUME OF OCEAN WATER/OCEAN WATER TEMPERATURE]
One possible confounding variable: [AIR TEMPERATURE/AIRBORNE SALT CONCENTRATIONS/COLOR OR NEARBY OCEAN WATERS]
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.
I have a tube filled with water with a temperature of 20.0°C and with a vapor pressure of 17.5 torr. If I collect gas over this water, and the total gas pressure of the gas solution is found to be 453.0 torr, what would be the pressure of the pure gas in atm? Question 21 options:
The pure gas has a pressure of 0.573 atm.
How does pressure work?Pressure is the amount of force applied perpendicularly to an object's surface divided by the surface area across which it is applied. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
What in chemistry is ATM?The definition of the standard atmosphere, or atm, as a unit of pressure is 101325 Pa. It is occasionally used as a standard pressure or a reference pressure. It roughly corresponds to the average atmospheric pressure at sea level on Earth.
based on the specified value;
we know that,
P(t)=P(water)+P(pure gas)
where,
P(t)=TOTAL PRESSURE OF THE GAS
P(water)= Vapour pressure of water
P(pure gas)=Pressure of pure gas
GIVEN;
P(pure gas)=P(t)-P(water)
=(453.0-17.5)
=435.5 torr
or P(pure gas)=435.5/760
=0.573
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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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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
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%
what is the volume in milliliter of 7.44 g of acetone
The volume in milliliter of 7.44 g of acetone 9.4897 mL
It is necessary to understand a substance's mass, volume, and density in order to answer this question. By dividing a material's mass by volume, the density of the substance may be calculated. The equation for density may now be written in mathematical form using the expression for density, and the equation for mass can be produced by rearrangement using the equation for density as a starting point.
Mass of acetone = 7.44 g (given)
Volume of acetone (v) = mass of acetone ÷ density of acetone
V = 7.44 g ÷ 0.784 g/mL
V = 9.4897 mL
Hence volume of acetone = 9.4897 mL
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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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why do we have to multiply the atomic mass of the oxygen to get 32?
A child is 3 feet 5 inches tall. How tall is the child in meters? Convert feet to inches, add total inches and convert to meters.
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.
Which of these formulas contain 2 nitrogen atoms?
1. Co(NO3)₂
II. (NH4)₂CO3
III. (NH4)3PO4
IV. AI(NO3)3
V. NH₂NO3
Select THREE correct answers.
Answer: I, II, V
Explanation:
What is the meaning of the word string in string coffe and string acid? How do we deal with this difference?
It ought to be "strong." Otherwise, string acid and string coffee would be absurd. So, the proper query would be:
What does the word "strong" mean in the context of strong coffee and strong acid?
Strong coffee indicates that there are more solids and coffee dissolved in the solution. It implies that strong coffee will typically be darker in color. It will also include a lot of caffeine. Strong coffee includes espresso and Death Wish Coffee.
The only acid that totally ionizes in aqueous solution is a strong acid. As soon as it is dissolved in water, it releases one proton H+. Its pH range will be between 0 and 1.
Strong acids include hydrochloric acid and sulphuric acid, for instance.
When strong coffee is dissolved in water, no chemical reaction occurs. When strong acid is dissolved in water, a chemical reaction occurs.
Strong coffee can be consumed, but strong acid cannot because they are both extremely corrosive.
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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.
When 10g of hydrogen gas is combined with 26g of nitrogen gas to form ammonia, what is the limiting reagent?
the limiting reagent is nitrogen gas.
steps:
write out balanced equation: 3H2 + N2 = 2NH3
convert to moles to find how much NH3 each yields
find molar mass of each
10 g H2 (1 mol/2.016g) (2NH3/3H2) = 3.31 mol NH3
26g N2 (1mol/28.02g)(2NH3/1N2)=1.86 mol NH3
since N2 yields less NH3, it is the limiting reagent.
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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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?
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).
