Answer:
[tex]P_2=0.393atm[/tex]
Explanation:
Hello,
In this case, we can use the combined ideal gas law in order to analyze its behavior as a function of changing temperature, volume and pressure:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
Thus, since we know the volume, temperature and pressure at the initial condition, we can compute the final pressure as shown below:
[tex]P_2=\frac{P_1V_1T_2}{T_1V_2} =\frac{1.00atm*225mL*(25+273)K}{(0+273)K*625mL}\\ \\P_2=0.393atm[/tex]
Regards.
What is the sand and water mixed together in a beaker called
Answer:
Explanation:
the sand and water mixed together in a beaker is known as heterogeneous mixture. it is type of mixture in which the constituents are not distributed uniformly
Biology is based on ___ interactions.
Answer:
Biology is based on organisms interactions
Explanation:
Not sure....if wrong pls correct me
Answer:
organisms
Explanation:
Biology is based on organisms interactions.
Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C 6H 5CO 2H) and 0.15M sodium benzoate (C
Answer:
[tex]pH=3.97[/tex]
Explanation:
Hello,
In this case, for the calculation of the pH of the given buffer we need to use the Henderson-Hasselbach equation:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
Whereas the pKa for benzoic acid is 4.19, the concentration of the base is 0.15 M (sodium benzoate) and the concentration of the acid is 0.25 M (benzoic acid), therefore, the pH turns out:
[tex]pH=4.19+log(\frac{0.15M}{0.25M} )\\\\pH=3.97[/tex]
Regards.
A wooden block has a mass of 20 g and dimensions of 5 cm x 1 cm x 1 cm.
A. What is the volume?
B. What is the density?
(Helppp)
Answer:
V = 5 cm³
ρ = 4 g/cm³
Explanation:
Step 1: Calculate the volume (V)
We have a wooden cuboid of dimensions 5 cm × 1 cm × 1 cm. We can calculate its volume using the following expression.
V = 5 cm × 1 cm × 1 cm
V = 5 cm³
Step 2: Calculate the density (ρ)
The density is equal to the mass divided by the volume.
ρ = m / V
ρ = 20 g / 5 cm³
ρ = 4 g/cm³
mcat reddit when titanium is used in an artificial hip replacement how does acidosis affect the metal
Answer:
It has no effect on the metal.
Explanation:
Hello,
In this case, we must remember that metabolic acidosis is related with the presence of an excess of acidic substances in the blood as a result of higher levels carbon dioxide in the lungs or lower levels of bicarbonate in the blood as well. Nevertheless, since titanium is a metal unlikely to be chemically modified by those weak acids such as carbonic acid in the blood, we can infer that it has no effect on the metal when used in an artificial hip replacement.
Regards.
Calculate the number of grams of deuterium in an 80,000-L swimming pool, given deuterium is 0.0150% of natural hydrogen
Answer:
[tex]m_{Deu}=2666.7g[/tex]
Explanation:
Hello,
In this case, we can apply the following mole-mass-density relationship in order to compute the required grams of deuterium, considering that it is the 0.0150% (molar basis) of natural hydrogen (H₂):
[tex]m_{Deu}=80000LH_2O*\frac{1000gH_2O}{1LH_2O}*\frac{1molH_2O}{18gH_2O} *\frac{1molH_2}{1molH_2O} *\frac{2gH_2}{1molH_2} *\frac{2*0.0150g\ Deu}{100gH_2} \\\\m_{Deu}=2666.7g[/tex]
Best regards.
Why don’t the trees spontaneously catch fire and burn all the time? Why don’t the fires stop immediately as soon as they start?
Answer:
Both of these phenomena is due to the ignition temperature.
Explanation:
Trees don't spontaneously catch fire because there is a temperature above which materials combust. This is called the "ignition temperature." This temperature must be reached before the trees will ignite, and the external condition does not always harbor such high temperature.
Fires don't stop immediately because, while some parts of the flame has cooled down sufficiently below the ignition temperature, other parts of the flame have not. It takes time for all the part of the flame to cool down below ignition temperature for the burning to stop.
These are all due to the ignition temperature.
The ignition temperature is defined as the temperature at which a substance begins to burn spontaneously.
The ignition temperature of a woody material is about 343 °C (650 °F). This ignition temperature is much higher than ambient temperature hence trees don't spontaneously catch fire and burn all the time.
Also, all the parts of the burning fire are not at the same temperature. Some parts may cool below the ignition temperature quicker than other parts of the flame hence the fires don't stop immediately as soon as they start.
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Which of the following is not a reason why organic structures promote innovation?
A) high formalization
B) low vertical differentiation
C) high flexibility
D) low centralization
E) cross-fertilization
Answer: Option A.
high formalization
Explanation:
High formalization is not a reason organic structures promote innovation because formalization refers to written rules, regulations, policies or descriptions of organic structures and it is not a reason to promote innovation of organic structures because there will be continual manner of structure behavior and there will be reduced motivation.
How does a lone pair distort the molecular shape?
O A. The lone pair forces bonding atoms farther from the nucleus.
B. The lone pair makes new bonds, changing the molecule's shape.
O C. The lone pair pushes bonding atoms closer to the nucleus.
O D. The lone pair forces bonding atoms away from itself.
SUBMIT
Answer:
The lone pair forces bonding atoms away from itself
Explanation:
According to Valence Shell Electron Pair Repulsion Theory (VSEPR), the shape of a molecule is determined by repulsions between electron pairs present in the valence shell of the central atom in a molecule.
Remember that electron pairs on the valence shell of the central atom in the molecule tend to position themselves as far apart from each other as possible. A lone pair takes up more space round the central atom than a bond pair. There is greater repulsion between a lone pair and a bond pair, this greater repulsion causes a distortion of molecular shape away from that predicted on the basis of VSEPR.
What is the mass of 10.0 cm the 3rd power of water
If you mean cubic cm, then it will be about 10 grams
Why does hot air rise and cold air sink?
A. Cold air has more kinetic energy than hot air.
B. Hot air has more potential energy than cold air.
C. Cold air is more dense than hot air.
D. Hot air is more dense than cold air.
Answer: C. Cold air is more dense than hot air.
Explanation: Took the test on edmentum
The mass of a neutron is equal to the mass of a proton plus the mass of an electron.
A. True
B. False
Answer:
B. False
Explanation:
The mass of a neutron is nearly the same mass of a proton whereas the electron is much less massive.
Exact masses are:
Neutron = 1.6749286x10²⁷ kg
Proton = 1.6726231x10⁻²⁷ kg
Electron = 9.1093897x10⁻³¹ kg
The mass of a proton plus the mass of an electron is:
1.6735340x10⁻²⁷ kg.
This mass is different to the mass of the neutron. Thus, the answer is:
B. FalseIf you had a box that you couldn't open, how could you find out what is inside?
Answer: use you imagination
Explanation:
if you don’t know and will never know, just guess
Answer:
Shake it, imagine whats in it, or leave it alone.
3. A balloon is filled with a mystery fluid that has a mass of 1000 kg and a volume of
of |
500 mL.
A. What is the density of the fluid?
B. Will the balloon sink or float in water?
(Helpppp ppls)
In an electron-dot symbol of an element, the dots are used to represent ________.
Answer:
Valence electrons.
Explanation:
Hello,
In this case, the electron dot structure is widely known for representing the valence electrons as dots placed around the chemical symbol and they are defined as the electrons configured at the outermost shell of the studied atom. Commonly, electrons are placed up to two on each side of the elemental symbol for a maximum of eight. For instance, sodium has one valence electron, sulfur has six valence electrons, helium has eight valence electrons and so on. Valence electrons are known to be dependent of the electron configuration.
Best regards.
Which statement illustrates how engineering has influenced society?
O A New, high-tech materials are used to make prosthetic limbs for
people who need them
O B. People expect that engineers will be able to continually improve
the designs of prosthetic limbs so that they can be even more
functional
O C. New, high-tech materials are used to make prosthetic limbs
because they are lighter, stronger, and more flexible than
traditional materials,
O D. People without a limb may desire new technologies to help them
perform everyday tasks easier
- PREVIOUS
Answer: It’s A.
A New, high-tech materials are used to make prosthetic limbs for
people who need them
Explanation: Took the test
The engineering has influenced society by a new, high-tech materials are used to make prosthetic limbs for people who need them. Therefore, option A is correct.
What is engineering ?Engineering is the design and construction of machinery, structures, and other things like bridges, tunnels, roads, cars, and buildings using scientific principles.
Engineers are specialists who create, design, analyze, construct, test, and evaluate machines, complex systems, buildings, gadgets, and materials to satisfy functional objectives and criteria while taking into account the practicality, regulation, safety, and cost constraints.
We have a wide range of engineering disciplines, many of which are highly specialized and created to address the great diversity of difficulties we confront. Chemical, civil, electrical, and mechanical engineering are the four primary categories into which engineering can be classified.
Thus, option A is correct.
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Given the following reactions, what is the overall enthalpy change for the following reaction?
NH_3(g) + HCl(g) right arrow NH_4Cl(s) .
Answer:
-176.0 kJ/mol
Explanation:
Let's consider the following balanced reaction.
NH₃(g) + HCl(g) → NH₄Cl(s)
We can calculate the standard enthalpy change for the reaction (ΔH°rxn) using the following expression.
ΔH°rxn = 1 mol × ΔH°f(NH₄Cl(s)) - 1 mol × ΔH°f(NH₃(g)) - 1 mol × ΔH°f(HCl(g))
ΔH°rxn = 1 mol × (-314.4 kJ/mol) - 1 mol × (-46.1 kJ/mol) - 1 mol × (-92.3 kJ/mol)
ΔH°rxn = -176.0 kJ/mol
How many grams of glucose (C6H12O6, 180.2 g/mol) would be required to prepare 2.00 L of a 0.318 M glucose solution that could be used in an IV bag?
Answer:
115 g
Explanation:
Step 1: Given data
Molar mass of glucose: 180.2 g/molVolume of solution: 2.00 LMolarity of the solution: 0.318 MStep 2: Calculate the moles of glucose
The molarity is equal to the moles of solute divided by the liters of solution.
M = moles of glucose / liters of solution
moles of glucose = M × liters of solution
moles of glucose = 0.318 mol/L × 2.00 L
moles of glucose = 0.636 mol
Step 3: Calculate the mass corresponding to 0.636 moles of glucose
0.636 mol × 180.2 g/mol = 115 g
Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up in this way. He placed
900 ml of water into each of five 1000 ml glass beakers. To each beaker he added 5 ml of water from an aquarium which contained a large concentration of
algae. The beakers were placed under a grow light which was timed to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the
following amounts: Beaker A-8 mi fertilizer, Beaker B - 6 ml fertilizer, Beaker C - 4 ml fertilizer, Beaker D-2 mi fertilizer, and Beaker E - no fertilizer. Each
week a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.
What is the independent variable in this experiment?
O hours of daylight
O amount of water
O amount of fertilizer
O number of algal cells
Answer:
amount of fertaliser--> the independant variable is the one being changed
Which of the following would you predict to have the greatest solubility in water?
a. cyclobutane
b. pentane
c propanol C.
d. kexanol
e. ethyl methyl ketone
Which of the following processes absorbs energy? A) condensation of water on a wind shield of a car B) formation of copperC) ball rollinflown a hill D) formation of ice from liquid water
E) oxide from copper and oxygen
Answer:
C) ball rollinflown a hill
Explanation:
The question asks to identify the endothermic process in the list of options. By way of elimination, we have;
A) condensation of water on a wind shield of a car
Condensation is an exothermic process. That is, heat is given out as the gases change into the liquid state of matter.
B) formation of copper
This is an exothermic process. Capture of electrons by a cation is always exothermic.
C) ball rollinflown a hill
This is the correct option. Energy is absorbed by the ball as it moves on the hill
D) formation of ice from liquid water
Freezing is an example of exothermic reaction. Heat is given off to the surroundings.
E) oxide from copper and oxygen
Formation of metal oxides and most reactions involving oxygen are exothermic reactions,
What is the answer, with the correct number of decimal places, for this problem? 4.392 g+ 102.40 g + 2.51 g=
A) 110 g
B) T09 g
C) 109.302 g
D) 109.30 g
E) 109.3 g
The correct answer with the correct number of decimal places and number of significant figures is 109.302 g.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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Order the materials from smallest refractive index to largest refractive index.
a. Air
b. Diamond
c. Glass
d. Quartz Water
Answer and Explanation:
The refractive index states that the incidence angle sine to refraction angle sign
Now, According to the given situation, the manner that the materials from the smallest refractive index to the largest refractive index is presented below:-
Air = 1
Water = 1.33
Glass = 1.52
Quartz = 1.46
Diamond = 2.42
From the above we can find the sequence that is
[tex]Air<Water<Quartz<Glass<Diamond[/tex]
Draw the d-orbital splitting for an octahedral and a tetrahedral complex.
Answer:
See explanation
Explanation:
In an octahedral crystal field, the metal is at the centre of an octahedron with ligands at the six corners of the octahedron. Approach of the ligand splits the orbitals into higher energy eg and lower energy t2g orbitals. The eg orbitals are 0.6∆o above the bari centre while the t2g orbitals are -0.4∆o below the bari centre.
In a tetrahedral crystal field, the tetrahedral crystal field splitting ∆t= 4/9∆o. In the tetrahedral crystal field, the t2 orbitals are at a higher energy and are +0.4∆t above the bari centre while the e orbitals are at a lower energy and are -0.6∆t below the bari center.
Which of the following experimental methods cannot be used to measure the rate of a reaction?
a. measurement of the change in the partial pressure of a gas-phase reactant over time
b. measurement of the equilibrium concentration of an acidic product via titration with a strong base
c. measurement of the absorbance of a colored reactant with time
d. measurement of the absorbance of a colored product with time
e. measurement of the change in the partial pressure of a gas-phase product over time
f. none of the above can be used to measure the rate of the reaction
g. I don't know
Answer:
I think a is the best answer. but really I can not confirm that.sorry for that.
The experimental methods which cannot be used to measure the rate of a chemical reaction is: B. measurement of the equilibrium concentration of an acidic product via titration with a strong base.
A chemical reaction can be defined as a chemical process which involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, so as to produce a new chemical compound.
The rate of a reaction is also known as reaction rate and it refers to the speed at a which the reactants in a chemical reaction are transformed into products. Some of the factors that affect the rate of a reaction are:
TemperatureCatalystConcentration of reactantsPressureIn Chemistry, an experimental method which cannot be used to measure the rate of a chemical reaction is the measurement of the equilibrium concentration of an acidic product by titrating it with a strong base because the concentration of product always remain the same.
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Do all living things have cells?
Answer:
Yes
Explanation:
All living things do have cells
Answer:
yes they all have to have cells for every living thing
Explanation:
if their was no cells in existence all the living will soon to be dead.
This is the net ionic equation for the complete neutralization of a generic diprotic acid with sodium hydroxide: H2A (aq) + 2 NaOH (aq) + 2 H20 (1) + Na2A (aq) a. OH- (aq) + H+ (aq) â H20 (1) b. 2 Na+ (aq) + A2- (aq) - Na2Cl (s) c. 2 OH- (aq) + 2 H+ (aq) + 2 H20
Answer:
c. 2 OH⁻(aq) + 2 H⁺(aq) ⇒ 2 H₂O(l)
Explanation:
Step 1: Write the molecular equation
The molecular equation includes all the molecular species.
H₂A(aq) + 2 NaOH(aq) ⇒ Na₂A(aq) + 2 H₂O(l)
Step 2: Write the complete ionic equation
The complete ionic equation includes all the ions and the molecular species.
2 H⁺(aq) + A²⁻(aq) + 2 Na⁺(aq) + 2 OH⁻(aq) ⇒ 2 Na⁺(aq) + A²⁻(aq) + 2 H₂O(l)
Step 3: Write the net ionic equation
The net ionic equation includes only the ions that participate in the reaction and the molecular species.
2 OH⁻(aq) + 2 H⁺(aq) ⇒ 2 H₂O(l)
Glucose and amino acids are reabsorbed from the glomerular filtrate by the __________.
Answer:
Amino acids, along with glucose, are reabsorbed in the glomerular system with a passive or active mechanism as the fluid travels through the entire renal tubular system and enters the circulation again.
Active mechanisms are those that require expenditure of energy, that is, expenditure of the energy currency, while the passive ones do not, they occur through spontaneous non-energy processes such as osmosis, the osmotic gradient and the difference in concentrations in different compartments.
Explanation:
Glomerular filtration is the regulator of the excretion of metabolites and toxic molecules or not necessary for our body. That is why if the amino acid values are high as well as those of glucose in urine, we will be facing a pathology.
If glucose is increased, it is because there is a glycemic peak in blood volume, hence possible diabetes.
And if the amino acids are increased, we could be facing an autoimmune or proteolytic pathology where a large amount of body proteins such as muscle proteins would be breaking down and releasing the amino acids that make it up, this phenomenon usually appears in those people who suffer from rhabdomyolysis in expenses very intense energy sources not appropriate.
On the other hand, glomerular filtration occurs in the kidney and is carried out by the nephron, which is the functional unit of the kidney, within it there is a specific tubular system in collection, absorption and reabsorption, added to the presence of Bowman's capsule.
Name three properties of matter that you can
measure using the metric system. Then give the basic
metric units used for each property.
Answer:
mass (gram), volume (litre) and length (metre)
Explanation:
Matter is usually defined as anything that has mass and can occupy space. Matter exists primarily in three forms; solid, liquid or as a gas. Some of the properties of matter and there corresponding metric units are listed below
Properties ⇒ Metric unit
Mass ⇒ gram
Volume ⇒ litre
length ⇒ metre
An insoluble solid is placed in water and the system allowed to reach equilibrium. The ratio of the rate at which ions join the solution and the rate at which ions join the lattice will be:
Answer:
One.
Explanation:
Hello,
In this case, the equilibrium condition is characterized by the equality of the rates at which a process happen and the contrary process happen, so its ratio is 1. For instance, a chemical reaction at equilibrium will have a contant ratio of the velocity at which the products are formed and the reactants consumed
However, for the described insoluble solid that is allowed the reach equilibrium, the ratio of the rate at which ions join the solution and the rate at which ions join the lattice will be one since it reaches an equilibrium state.
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