10. Which of the following consists of two or more pure substances?
A. ice
B. oxygen
C. soda pop
D. ammonia
Answers
Related Questions
At the UNAM's Science Faculty, the probability that a student who is admitted for studies takes Chemistry AND Geology is 0.08. The probability that a student takes Geology is 0.45. Let C denote the event: student chooses Chemistry; and let G denote the event: student chooses Geology. What is the probability that a student will choose Chemistry given that the student is taking Geology? 2. An X-ray test is used to detect a certain disease that is common in 3% of the population. The test has the following error rates: 7% of people who are disease-free do get a positive reaction and 2% of the people who have the disease do get a negative reaction from the test. A large number of people are screened at random using the test, and those with a positive reaction are further examined. What is the probability that a person tested at random indeed has the disease given that the test result shows positive?
Answers
P(C|G) = P(C and G) / P(G)
Given that the probability of a student taking Chemistry AND Geology is 0.08 (P(C and G) = 0.08) and the probability of a student taking Geology is 0.45 (P(G) = 0.45), we can substitute these values into the formula:
P(C|G) = 0.08 / 0.45 ≈ 0.1778
Therefore, the probability that a student will choose Chemistry given that the student is taking Geology is approximately 0.1778, or 17.78%.
To find the probability that a person tested at random indeed has the disease given that the test result shows positive, we can use Bayes' theorem:P(Disease|Positive) = (P(Positive|Disease) * P(Disease)) / P(Positive)
Given that the disease is common in 3% of the population (P(Disease) = 0.03), the error rate for people who are disease-free getting a positive reaction is 7% (P(Positive|Disease-free) = 0.07), and the error rate for people who have the disease getting a negative reaction is 2% (P(Negative|Disease) = 0.02), we can calculate the probability of a positive result (P(Positive)) as follows:
P(Positive) = (P(Positive|Disease) * P(Disease)) + (P(Positive|Disease-free) * P(Disease-free))
= (0.98 * 0.03) + (0.07 * 0.97)
≈ 0.0294 + 0.0679
≈ 0.0973
Now, we can substitute these values into Bayes' theorem:
P(Disease|Positive) = (0.98 * 0.03) / 0.0973
≈ 0.0294 / 0.0973
≈ 0.3026
Therefore, the probability that a person tested at random indeed has the disease given that the test result shows positive is approximately 0.3026, or 30.26%.
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The concentration of which ion is increased when LIOH is dissolved in water
Answers
Answer:OH^- ion
Explanation: When LiOH added in water then LiOH dissociated in Li+ and OH- . Water is a composition of H+ and OH- ions hence concentration of OH- ions will be increased after adding LiOH.
are essential nutrients needed for tissue growth and repair.
Vitamins
water
fats
proteins
Answers
hope this helped:)
Answer
Proteins
Explanation:
edg.2020
A science class investigated the relationship between the amount of time
students spend doing chores every night and their average grades on
schoolwork. Which statement from the lab report best represents a
conclusion?
A. Based on our results, students who do 1 hour of chores per night
have grades that are on average 0.2 points higher than students
who do no chores.
B. Doing chores at night actually helps students do better at school,
even if it seems like the opposite would be true.
C. We believe that students should spend at least 2 hours doing
chores every night if they want to get better grades at school and
help their families.
O D. If students spend at least 1 hour per night on chores, then they are
guaranteed to get higher grades on their schoolwork.
Answers
Answer:
A
Explanation:
Did the quiz
The statement from the lab report best represents a conclusion, based on our results, students who do 1 hour of chores per night have grades that are on average 0.2 points higher than students who do no chores. The correct option is A.
What is a scientific investigation?A scientific investigation is an investigation that is done by experimenting or solving things by scientific methods. These methods include variables, and controlled calculation and time.
Here, the lab investigation is saying the relationship between the number of times students are spending the time doing chores every night
Thus, the correct option is A. According to our findings, pupils who perform one hour of chores each night earn, on average, 0.2 points more than those who do not.
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you have a block of dry ice (−40°c), an ice cube (−5°c), water (10°c), and alcohol (15°c). in which example do molecules move the fastest? question 1 options: water alcohol dry ice ice cube
Answers
The speed of the molecules in a substance is directly proportional to the temperature of that substance. The higher the temperature, the faster the molecules move.
In this scenario, we have four substances with different temperatures - dry ice at -40°C, ice cube at -5°C, water at 10°C, and alcohol at 15°C.
Among these substances, alcohol has the highest temperature at 15°C, and hence its molecules are moving the fastest. Water has a lower temperature than alcohol, but still higher than the ice cube and dry ice. Therefore, water molecules are moving faster than the molecules in the ice cube and dry ice.
The molecules in the ice cube are moving slower than those in water as they have a lower temperature than water. Similarly, dry ice has the lowest temperature among all the substances, so the molecules in dry ice are moving the slowest.
In summary, the substance with the highest temperature, in this case, alcohol, has the fastest-moving molecules, and the substance with the lowest temperature, dry ice, has the slowest-moving molecules.
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should i get this? i heard it smells good
Answers
Answer: Maybe not? Unless you care about namebrand, theres lots of dupes.
Identify how many significant figures there are in the following number:
3404 pens
Select one:
O a. 2
O b. 3
O c. 4
O d. Infinite
Answers
which of the following best describes a metastable state? group of answer choices this state changes the position of the equilibrium but not the rate. the metastable state is created by the prosthetic group of the enzyme. this state is composed of the difference in activation energy of a catalyzed versus an uncatalyzed reaction. the metastable state is a state of the substrate in which the reaction can proceed but typically requires a catalyst. the metastable state is formed by transient complexes with the substrate.
Answers
A metastable state is a state of the substrate in which the reaction can proceed but typically requires a catalyst. This statement best describes a metastable state. The correct answer is C.
What is a metastable state?A metastable state is a state of the substrate in which the reaction can proceed but typically requires a catalyst. It is a state of matter that is not in equilibrium but appears to be in equilibrium for a long time, after which it collapses to its most stable state.
Metastability is the quality of a non-equilibrium system to remain in a quasi-stable state for a longer period than predicted by the system's relaxation time.
Here are some characteristics of metastable states: The equilibrium changes in the state but not in the rate. The activation energy difference between a catalyzed and an uncatalyzed reaction makes up the metastable state. The state is made up of transient complexes with the substrate.
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Help me get it right and no links
Answers
Answer: Natural Resources
Explanation:
the heat of vaporization for ethanol is 0.826 kj/g 0.826 kj/g . calculate the heat energy in joules required to boil 75.25 g 75.25 g of ethanol.
Answers
The heat energy required to boil 75.25 g of ethanol is 61.05 kJ or 61,050 J.
The heat of vaporization is the amount of heat energy required to convert a given amount of a substance from its liquid state to its gaseous state. It is expressed in units of energy per unit of mass, such as joules per gram or kilojoules per gram.
In this case, the heat of vaporization for ethanol is given as 0.826 kJ/g. To calculate the heat energy in joules required to boil a specific mass of ethanol, we multiply the heat of vaporization by the mass of ethanol.
For example, if we want to calculate the heat energy required to boil 75.25 g of ethanol, we simply multiply the heat of vaporization by the mass of ethanol:
0.826 kJ/g * 75.25 g = 61.05 kJ
So, the heat energy required to boil 75.25 g of ethanol is 61.05 kJ or 61,050 J.
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The mass of 10 moles of ammonia is 17 grams true or false
Answers
Answer:
False, 17.03*10 = 170.3g not 17
Ok so im practicing and working on my understanding of the Empirical Formula, they were using the empirical formula to find out the molecular formula. Why did he use 16? It stumped me and I dont know if its a random variable to use as a place holder to find out the molecular formula or if I missed something. Can someone Please help me? I know its a basic chemistry formula but the converting to a molecular formula is where its getting me. Thank you.
Answers
The empirical formula can be found by dividing the molar mass of the compound by the molar mass of the empirical formula.
To find the molecular formula, you first need to determine the empirical formula, which represents the simplest whole number ratio of atoms in a compound. The empirical formula can be found by dividing the molar mass of the compound by the molar mass of the empirical formula.
Once you have the empirical formula, you can use the molar mass of the compound to determine the molecular formula. To do this, you divide the molar mass of the compound by the empirical formula mass, which gives you a number known as the "multiplying factor."
The multiplying factor represents the number of times the empirical formula must be multiplied to get the molecular formula. For example, if the multiplying factor is 2, then the molecular formula is twice the size of the empirical formula.
As for why the number 16 was used, it's possible that it represents the molar mass of a particular element or compound involved in the problem. Without more information about the specific problem you were working on, it's difficult to say for sure. However, it's important to note that the number used in the calculation is not a random variable, but rather a key component in determining the molecular formula.
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Which characteristic of water allows its molecules to form hydrogen bonds? (1 point)
Answers
Answer:
Water molecule is polar.
Explanation:
The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules.
Drag each tile to the correct image.
Match each alkane name with its structure.
octane
decane
propane
butane
heptane
CHE
IGH
CHE
Reset
Next
Answers
Answer:
The first one is Propane
The second one is HEPTANE
The third one is octane
The 4th is butane
the 5th is decane
The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.
The following structures has been given as:
The structure has 3 carbon atoms with the presence of 8 hydrogen. The molecular formula has been \(\rm C_3H_8\). It has been the structure of propane.The structure has 7 carbon and 16 hydrogen. The structure has been the representation of heptane with molecular formula \(\rm C_7H_{16}\).The structure has molecular formula \(\rm C_8H_{18}\) with 8 carbon and 18 hydrogen. It has been named Octane, according to IUPAC.The structure with 4 carbon and 10 hydrogen with molecular formula \(\rm C_4H_{10}\) has been named according to IUPAC as butane.The structure with molecular formula \(\rm C_{10}H_{22}\) has presence of 10 carbon and 22 hydrogen. It has been named as Decane.The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
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In an atom:
The nucleus is made of electrons and protons.
Protons have positive charges.
Neutrons have negative charges.
All of the above.
can someone please help me ived this 2 times
Answers
Answer:
Explanation:
The nucleus of an atom contains protons and neutrons.
Protons have positive charges, neutrons have neutral charges (no charge), and electrons have negative charges. That is why when you determine net charge of atom you only look at the proton to electron ratio since the neutrons don't matter when it comes to charge.
I hope this helps. Let me know in the comments if anything is unclear.
Which of the following elements can exist in more than one form in the same
state?
neon
iodine
carbon
iron
Answers
Answer:
neon
Explanation:
it comes in different colours
Awarding 50 points for this question!!
From the paragraph in the image, what are the independent, dependent, and control variables?
Answers
Answer:
there is no paragraph
Explanation:
how much energy would be absorbed as heat by 75g of iroin when heated from 295 k to 301 k
Answers
Answer:
The amount of energy absorbed as heat by the iron when heated from 295 K to 301 K is 151.95 J.
Explanation:
To calculate the amount of energy absorbed as heat by the iron, we can use the equation:
q = mcΔT
Where q is the amount of energy absorbed as heat, m is the mass of the iron, c is the specific heat capacity of iron, and ΔT is the change in temperature.
The specific heat capacity of iron is 0.449 J/g·K.
First, we need to calculate the change in temperature:
ΔT = 301 K - 295 K = 6 K
Next, we can plug in the values:
q = (75 g)(0.449 J/g·K)(6 K)
q = 151.95 J
Therefore, the amount of energy absorbed as heat by the iron when heated from 295 K to 301 K is 151.95 J.
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What is the reaction if you mix vinegar Ajax bleach together.
Answers
Answer:
A chlorine gas is formed from a mixture of both, which is a dangerous mixture that can cause bad health problems.
Explanation:
The mass of an object is 100 kg and has a volume
of 20 cm3 what is the object's density?
Answers
The object's density is 5 gcm^-3
What is Density?The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however Latin letter D may also be used.
Mass divided by volume is the formula for density in mathematics: displaystyle rho = frac mV. where m is the mass, V is the volume, and is the density.
Therefore, Density is Mass/Volume
100g/20
= 5 gcm^-3
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Please tell me what the answer is please
Answers
Answer:
2
Explanation:
Answer:
The brain
Explanation:
Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface which process causes this difference in temperature?
1. convection
2. evaporation
3. radiation
4. conduction
Submit Answer
Answers
Answer:
convection
Explanation:
which of the following is a plausible scenario for the work of coq in the electron transport chain?
Answers
The following is a plausible scenario for the work of CoQ in the electron transport chain: CoQ is reduced by Complex I & later oxidizes Complex III (Option B).
CoQ, which stands for coenzyme Q, plays a vital role in the electron transport chain (ETC). The CoQ receives electrons from Complex I in the form of NADH and becomes reduced. Reduced CoQ then moves to Complex III, where it donates these electrons, resulting in the formation of ubiquinol and the transfer of protons across the inner mitochondrial membrane. After this transfer, CoQ oxidizes Complex III and receives electrons to form a semi-reduced CoQ, which subsequently moves to Complex IV.
Your question is incomplete, but most probably your options were
A: CoQ is reduced by Complex I & later oxidizes Complex III
B: CoQ oxidizes Complex I & then is later oxidized by Complex III
C: CoQ reduces Complex I and later reduces Complex III
D: CoQ is oxidized by Complex I and is later oxidized by Complex III
Thus, the correct option is B.
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nitrates, turbidity and acidity. Whichwater sample was likely runoff from a farm?
Answers
Answer:
What is the most likely source of nitrogen in runoff? Fossil fuel emissions.
Why do you think that renewable sources of energy tend to be "cleaner" sources than fossil fuels
Answers
Answer: renewable sources are better for the planet.
Explanation:
renewable sources are better for the planet, because we can use them repeatedly and can be replenished. However, non-renewable is the opposite of renewable sources (fossil fuel)
Question 4 An incompressible fluid flows down a vertical cylindrical pipe of length L and radius R, according to the laminar flow regime. a) Derive an expression for the velocity profile of the fluid using an appropriate Navier-Stokes equation. State all assumptions. b) If the pipe is 6 m in length, 5 cm in diameter, has a friction factor of 0.01 and the density of the fluid is 1020 kg/m³, calculate the pressure drop if a constant flow rate of 3 m³/hr is maintained.
Answers
The velocity profile of an incompressible fluid flowing down a vertical cylindrical pipe can be derived using the Navier-Stokes equation under certain assumptions. With a pipe length of 6 m, diameter of 5 cm, friction factor of 0.01, and a constant flow rate of 3 m³/hr, we can calculate the pressure drop using the given information.
a) To derive the velocity profile of the fluid in the pipe, we can start with the Navier-Stokes equation, which describes the motion of a fluid. Under the assumption of laminar flow and incompressibility, the equation simplifies to:
dP/dz = (32μLQ) / (πR^4)
where dP/dz is the pressure gradient, μ is the dynamic viscosity of the fluid, L is the pipe length, Q is the volumetric flow rate, and R is the pipe radius. By integrating this equation, we can obtain the velocity profile of the fluid.
b) To calculate the pressure drop, we need to convert the flow rate from m³/hr to m³/s. Given that 1 m³/hr is equal to 1/3600 m³/s, the flow rate becomes Q = 3 / 3600 m³/s. By substituting the values of μ, L, Q, and R into the derived equation, we can calculate the pressure gradient. Finally, the pressure drop can be obtained by multiplying the pressure gradient by the length of the pipe (6 m).
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A gas occupies a volume of 143 mL at 35.0 °C and .5 atm. What is the volume of the gas at standard temperature and pressure of 1 atm and 0°C.
A.0 mL
B.8.50 x 10-4 mL
C.63.4 mL
D.557.7 mL
Answers
P1V1/T1 = P2V2/T2
P1 = 0.5 atm
V1 = 143 mL
T1 = 35.0°C = 308 K
P2 = 1 atm
V2 = ?
T2 = 0°C = 273 K
Solve the equation for V2 and you get:
V2 = P1V1T2/T1P2 = (0.5 atm)(143 mL)(273 K) / (308 K)(1 atm) = 63.4 mL
C. 63.4 mL
a certain element x is made up of two isotopes, one with an atomic mass of 63.9358 that is 48.632% abundant, and one with an atomic mass of 65.9343 that is 51.368% abundant. calculate (to the correct number of significant figures) the average atomic mass for x.
Answers
32.0662
We have given an element X which is made up of two isotopes, one isotope has an atomic mass of 63.9358, which is 48.632% abundant, and the other isotope has an atomic mass of 65.9343, which is 51.368% abundant. We need to calculate the average atomic mass for X. Solution: We know that: Atomic mass = (mass of isotopes 1 x % abundance of isotope 1) + (mass of isotope 2 x % abundance of isotope 2)/100. Let the atomic mass of element X be m. Then, Substituting the values of the atomic mass and abundances, we get, m = (63.9358 × 48.632) + (65.9343 × 51.368)/100= 31.045288 + 33.991912/100= 32.0662. Average atomic mass for X is 32.0662 rounded to 5 significant figures.
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Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its opening. The bottle is placed in a hot water bath for some time. Explain the change to the size of the balloon based on the kinetic molecular theory.
Part 2. What would most likely happen to the balloon if the bottle was then placed into a jar of cold water with ice cubes? Explain your answer based on the kinetic molecular theory.
In both cases, assume the balloon is attached tightly enough so that air does not escape the system.
Answers
1. When the bottle is placed in a hot water bath, the temperature of the water and the air inside the bottle increases.
2. Placing the bottle in the cold water with ice cubes lowers the temperature of the water and the air inside the bottle. A
What is the kinetic molecular theory?
The air inside the glass bottle with the water and the balloon gains greater kinetic energy as a result of the hot water bath's higher temperature. The additional kinetic energy causes the average speed of the air molecules to increase, which raises the pressure and causes the balloon to expand as a result.
The air within the bottle and the balloon loses kinetic energy when it is placed in a jar of cold water with ice cubes because of the drop in temperature. The air molecules move less quickly on average, the pressure drops, and the balloon contracts as a result of the decreased kinetic energy.
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2. At about what temperature will 37 g of both copper(II) sulfate and potassium chloride disse
in 100 g of water?
Answers
The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
What is solubility?The solubility of a substance is its ability to be dissolved in water.
Solubility of 37 g of Copper (II) sulfateThe solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.
Solubility of 37 g of potassium chlorideThe solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.
Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
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