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If the theoritical yield of PbCl2 is 16.547 g from the reaction of 7.000 g of NaCl with 50.400 g of Pb(NO3)2. Calculate the % yield of PbCl2 if 12.798 g of PbCl2 was actually obtained? (Atomic mass: Na-22.990 g/mol;0-15.999 g/mol; Cl-35.453 g/mol; Pb-207....

2 years ago

Which of the following are physical properties? Mass Density Flammability Rusting

2 years ago

Calculate the enthalpy change for the reaction: P4O6(s)+ 2O2(g) → P4H10(s) Given the following enthalpies of reaction: P4 (s) + 3 O2 (g)⇾P4O6 (S) incrementH = -1640.1 kJ P4 (s) + 5 O2 (g)⇾P4O10 (S) incrementH = -2940.1 kJ

2 years ago

An unknown substance used in the Agricultural sector has the formula CN3H5 .Calculate the percent by mass of nitrogen in the unknown substance to the nearest three significant digits? (N-14.007 g/mol; C-12.011 g/mol; H-1.008g/mol).

2 years ago

A metal carbonate, XCO3 of mass 2.012 g was heated resulting in the formation of XO, a metal oxide and carbon dioxide with a mass of 0.855 g according to the reaction shown below: XCO3 (s) → XO (s) + CO2 (g) (Atomic mass of O-15.999 g/mol; H-1.008 g/mol;...

2 years ago

A water geyser works by heating cold water. The hot water is then released through an outlet nozzle. If the system and pressure-relief valve malfunctions, the continuous production of steam can damage the geyser. If the pressure of the steam is too high,...

2 years ago

23.780 g of acetaldehyde (CH3CHO) reacts completely with oxygen to produce acetic acid (HC2H3O2) using manganese (II) acetate catalyst according to the equation shown below: 2CH3CHO + O2 → 2HC2H3O2 What mass of acetic acid (HC2H3O2) was produced? (Atomic...

2 years ago

Calculate the change in enthalpy, ΔH in joules (J) for the reaction below carried out at constant pressure of 11.1 atm at a volume of -2.3 m3 with internal energy of -90.9 kJ. N2 +3H2 → 2NH3 ΔH = ? -64.4 x 103 J -116.4 x 103 J +116.43 J + 64.4 J

2 years ago

The airbag is the car works using the Ideal gas law. When an airbag is inflated, the nitrogen gas has a pressure of 23.011 atm, a temperature of 39.00 degreeC, and a volume of 78.00 mL. What is the number of moles of the nitrogen gas? (R =0.08206 L.atm/...

2 years ago

A special gas mixture is used in bacterial growth chambers which contains 5.00% by mass of CO2 and 95.0% O2. If the mole fraction of CO2 and O2 in the mixture is 0.0998 and 0.2340, respectively. What is the partial pressure in atmospheres of O2 and CO2 ga...

2 years ago

How many grams of lead (II) chloride (PbCl2) are produced from the reaction of 7.000 g of NaCl and 50.400 g of Pb(NO3)2?Calculate the theoritical yield of PbCl2? (Atomic mass: Na-22.990 g/mol; 0-15.999 g/mol; Cl-35.453g/mol; Pb-207.200 g/mol; N-14.007). 2...

2 years ago

An elephant weighs 6.818 Kg on earth, what is the weight in Jupiter if the gravity is 24.9 N/Kg to the correct significant digits Blank 1

2 years ago

Lead (II) chloride (PbCl2) are produced from the reaction of 7.000 g of NaCl with 50.400 g of Pb(NO3)2. What is the limiting reactant? (Atomic mass:Na-22.990 g/mol; 0-15.999 g/mol; Cl-35.453 g/mol; Pb-207.200 g/mol;N-14.007). 2NaCl+ Pb(NO3)2 → 2 NaNO3 + P...

2 years ago

Deep-sea divers commonly use oxygen blended with an inert gas. The partial pressure of oxygen changes according to the needed requirement. After every depth of 100 feet, the diver experiences 3 atm pressure, resulting in inability to inhale normal air. Wh...

2 years ago

In the combustion of carbon to form methane, the change in enthalpy is -652 kJ C(g) + 4H(g) rightwards arrowCH4 (g) incrementH = −652 kJ What will be the value of incrementH for the process 1 halfC (g)+ 2H (g) rightwards arrow 1 halfCH4 (g) i...

2 years ago

The speed at which gas molecules move can be described as Blank 1 and when the gas molecules collide at constant temperature the Blank 2 will not change

2 years ago

A student did a research on weight and mass and reported the findings shown below. Using your knowledge of PAC 110, which statements below are incorrect? The weight of the 5 g igneous rock at Cliffe Castle Museum was 49.0 N The scalar quantity is the mass...

2 years ago

The lungs expand when we breathe in, resulting in an increase in the volume and a decrease in pressure. When we breathe out, the lungs shrink, resulting from a decrease in the volume and an increased pressure. Which of the gas laws us applicable to the ab...

2 years ago

The pressure of a sample of an inert gas reduced significantly from 100 kPa to 30kPa. The temperature increases from 27degreeC to 93degreeC. If the initial volume is 20 L, what is the final volume? 81 L 54.2 L 96 L 55 L

2 years ago

When a 7.50 g sample of solid NaOH dissolves in100.00 g of water in a coffee-cup calorimeter, the temperature rises from 21.6°C to 37.8°C. Calculate the ∆H (in kJ/mol NaOH) for the solution process. (Assume the specific heat of the solution formed is 4.18...

2 years ago

On aerosol deodorant cans, the symbol of flammable is clearly shown. What happens when the can is exposed to high temperature? Its outcome if applicable to Charles law The can expands and is directly proportional to the temperature The pressure of the can...

2 years ago

An unknown compound of mass 10.7696 g containing carbon, hydrogen and oxygen was combusted in oxygen producing CO2 (29.5747 g) and H2O (12.1068 g). Caluculate the mass of oxygen produced? (Atomic masses of C-12.011 g/mol; O-15.999 g/mol; H-1.008 g/mol). 1...

2 years ago

A student performed an analysis of a sample for its calcium content and got the following results: 14.91%, 14.89%, 14.88%, and 14.90% The actual amount of calcium in the sample is 14.90%. Calculate the percentage error and precision. Comment on the precis...

2 years ago

Platinum has a density of 21.40 g/cm3. What is the mass of 0.0059 L of this metal in kg? 126.26 kg 126.3 kg 0.12626 kg 0.13 kg

2 years ago

When 15.0 g of sodium nitrate (NaNO3) was dissolved in water in a bomb calorimeter, the temperature reduced from 25.00 °C to 21.56 °C. If the heat capacity of the solution and the calorimeter is 1071 kJ/°C, what is the enthalpy change for the process per...

2 years ago

The table below shows some values for standard enthalpy changes of combustion. Use these values in the table below to calculate the standard enthalpy change of the reaction C (s) + 2H2 (g) ⇢CH4 (g) Substance incrementHc Ө / kJ/mol C (s) -394 H2 (g) -2...

2 years ago

Chlorine can be pressurized and cooled to change into a liquid for storage. When liquid chlorine is released, it quickly turns into a gas that stays close to the ground and spreads rapidly. Chlorine gas can be recognized by its pungent, irritating odour,...

2 years ago

A student drops an object weighing 10.89 g into a 100.00 mL of ethanol in a measuring cylinder. An unknown volume of ethanol spills out which is equal to the volume of the object. The volume of the ethanol remaining in the measuring cylinder in now 73.20...

2 years ago

Calculate the root mean square velocity of the oxygen gas (O2) molecules at 77 °C. (R =8.314 Kg.m²/S².mol.K). (atomic mass of O-15.999 g/mol) 16.52 x 105 m/s 2.72 x 105 m/s 272.82 x 10 m/s 5.22 x102 m/s 16.52 X 10 to the power of 5 m/s 2.72 X 10 to the...

2 years ago

Sonia Jean Reading 1 Reading 2 Reading 3 Reading 1 Reading 2 Reading 3 7.90 7.88 7.87 5.78 5.77 5.79 Sonia and Jeans weighed the mass of the same an unknown compound three times and obtained the readings shown in the table. Which statement below is correc...

2 years ago

Chicken soup is an example of __________________________ Heterogenous Mixture Homogenous mixture Chemical change Physical change

2 years ago

The intermolecular force between the molecules of gases can be described as Blank 1

2 years ago

How much of heat is needed to warm 500 g of water from 25 °C near to its boiling point of 99°C? The specific heat of capacity is 4.18J/g-k. 2.10 X10 squared J 1.55 X 10 to the power of 5 J 67.9 J 52.3 J

2 years ago

Sasko bread is made using yeast. Yeast is a living organism that converts the sugars in the bread mixture known as a dough into carbon dioxide gas, the bubbles of which get trapped and make the dough to rise and expand. When the dough is then placed in an...

2 years ago

An unknown compound contains 13.04% of hydrogen,34.78% of oxygen, and 52.17% of carbon by mass. Determine the empirical formula of the unknown compound. (Atomic massof O-15.999 g/mol; H-1.008 g/mol; C-12.011 g/mol) CH2OH C2H6O C2H6OH C6H12O6

2 years ago

The internal energy ∆E of a system is -230 kJ. If the system released 300 kJ, How much work was done in the system? Based on your answer, one of the following answer is correct. Heat flow is constant Work is done on the system The system does work It is a...

2 years ago

James mistakenly mixed hexane with dichloromethane and water. If the density of hexane is 661 K g/m3, the density of dichloromethane is 1322 kg/m3, and the density of water is 1000 Kg/m3, using a separating funnel to separate as shown below. Label A Blank...

2 years ago

1. Philosophy is one of the oldest provinces of knowledge to attain……… Power Integrity Wisdom Love

2 years ago

The …… believed that a person becomes wise byknowledge and understanding. Ancient Romans Ancient Italians Ancient Egyptians Ancient Greeks

2 years ago

Philosophy seeks to integrate the …….. with that of other fields of study to achieve some kind of consistence as well as coherent world views. Knowledge of science Knowledge of truth Knowledge of human existence Knowledge of human kind

2 years ago

Realism is the theory that holds …… is the real. Existence of objects Existence of humans Existence of beliefs Existence of principles

2 years ago

Exponents for naturalism are Plato. Kant, Hegel Dewey, William James, S. Kilpatrick Rousseau, Cornenius, Spencer Aristotle, John Locke, John Friedrich

2 years ago

Educational aims of naturalism Self-expression Self-preservation Struggle for existence All of the above

2 years ago

The fundamental principle of naturalism is that education should be based on the child’s ……. Development Psychology Growth Beliefs

2 years ago

Naturalism believes that …… and …… are identical. Reality and nature Reality and values Reality and principles Reality and beliefs

2 years ago

Some exponents of pragmatism are Plato, Kant, Hegel Dewey, William James, S, Kilpatrick Rousseau, Comenius, Spencer Aristotle, John Locke, John Friedrich

2 years ago

One of the aims of Pragmatism is Continuous growth Intellectual growth Physical growth Emotional growth

2 years ago

One fundamental principle of Pragmatism is that truth Absolute Changes Fixed Ideal

2 years ago

Pragmatism puts emphasis upon ……. of life. Adaptation Practicalities Understanding Limitations

2 years ago

One of the educational aims of Idealism is to Develop the mind Develop the soul Develop the body Develop the whole being

2 years ago

The fundamental principle of Idealism maintain that ……. Is the source of all knowledge. Man Wisdom God Philosophy

2 years ago

Idealists believe that …….. are the true reality. Beliefs Ideas Values Principles

2 years ago

Epistemology is concerned with The nature of reality The nature of values The nature of knowledge The nature of beliefs

2 years ago

Teaching from authentic self makes teaching Difficult Confusing Complicated Effortless

2 years ago

Educational philosophies should be like lesson plan …… Aim Topic Objective Structure

2 years ago

Effective teachers and people of good character often have ……. educational philosophies. Same Differing Linked Common

2 years ago

Your teaching philosophy should be aligned with your… Understanding and imagination Knowledge and strengths Interpretation and thinking Values and beliefs

2 years ago

Different educational philosophies is a sign of…… within an educational setting. Dysfunction Strength Experience Weakness

2 years ago

Educational philosophies Evolve Interact Diminish Regress

2 years ago

Philosophy seeks to integrate the …….. with that of other fields of study to achieve some kind of consistence as well as coherent world views.

2 years ago

Which of the following are physical properties? Rusting Flammability Mass Density

2 years ago

Give the answer of the problem to the correct number of significant digit fraction numerator 8.91 space X space 0.0271 space X space 0.2 over denominator 0.0056 space X space 2.341 end fraction

2 years ago

In the combustion of carbon to form methane, the change in enthalpy is -652 kJ C(g) + 4H(g) ® CH4(g) DH = −652 kJ What will be the value of DH for the process 1/2C(g)+ 2H(g) ® 1/2CH4(g) DH = ? -652kJ +652kJ -326kJ +326 kJ

2 years ago

Platinum has a density of 21.40 g/c m cubed. What is the mass of 0.0059 L of this metal in kg?

2 years ago

Give the answer to the correct significant digit 0.71+ 96.6 + 2.003 + 0.0054 +2.1 =

2 years ago

The internal energy ∆E of a system is -230 kJ. If the system released 300 kJ, How much work was done in the system? Based on your answer, one of the following answer is correct. The system does work Heat flow is constant Work is done on the system It is a...

2 years ago

When a flat tyre is filled with with air, the increased volume of air in the flat tyre results in the flat tyre recovering its previous shape. The volume of air pumped into the tyre will be directly number of molecules of air that are held within the tyre...

2 years ago

An unknown compound has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye. (Atomic mass of C-12.011 g/mol; N =14.007 g/mol; H- 1.008 g/mol).

2 years ago

How much of heat is needed to warm 500 g of water from 25 °C near to its boiling point of 99°C? The specific heat of capacity is 4.18J/g-k.

2 years ago

How much of heat is needed to warm 500 g of water from 25 °C near to its boiling point of 99°C? The specific heat of capacity is 4.18J/g-k. 67.9 J 52.3 J 1.54 X 10 squared J 2.10 X10 squared J

2 years ago

The principal protein of muscle has a mass of 0.000000000000000001031 gram. Convert the following number to scientific notation in three significant figures.

2 years ago

Calculate the root mean square velocity of theoxygen gas (O2) molecules at 77 °C. (R =8.314 Kg.m²/S².mol.K). (atomic mass of O-15.999 g/mol).

2 years ago

Calculate the root mean square velocity of theoxygen gas (O2) molecules at 77 °C. (R =8.314 Kg.m²/S².mol.K). (atomic mass of O-15.999 g/mol). 5.22 x10 squared m/s 272.82 x 10 m/s 2.72 x 10 to the power of 5m/s 16.52 x 10 to the power of 5 m/s

2 years ago

Sonia and Jeans weighed the mass of the same an unknown compound three times and obtained the readings shown in the table. Which statement below is correct when discussing the set of results obtained by Jeans and Sonia. Sonia Jeans Reading 1 Reading 2 Rea...

2 years ago

The temperature of a chemistry laboratory during summer was recorded to be 29.32 degreeC. A student used a thermometer to measure the temperature four times and recorded the temperatures shown below. Calculate the percentage error. 28.62 degreeC 27.0...

2 years ago

Chicken soup is an example of Pure solution Heterogenous mixture Homogenous mixture Mixture

2 years ago

The lungs expand when we breathe in, resulting in an increase in the volume and a decrease in pressure. When we breathe out, the lungs shrink, resulting from a decrease in the volume and an increased pressure. Which of the gas laws us applicable to the ab...

2 years ago

If 5.00 g CaCO3 reacted with 5.00 g HCl. Determine the limiting reagent? CaCO3+2HCl → CaCl2 + CO2 + H2O (Molar mass: Ca 40g/mol; O 16 g/mol; C 12 g/mol; Cl 35.5 g/mo; H 1g/moll)

2 years ago

Pedagogy is: The study of the methods used for teaching and learning. The process of getting a degree The process where the lecturer has all the authority, and the students must listen

2 years ago

Pedagogy of the oppressed is pedagogy for the people

2 years ago

Pedagogy of the oppressed is pedagogy for the people True False

2 years ago

Which of the following do not fit bloom’s Taxonomy Remember Copy Analyse Apply

2 years ago

Why is it that students are viewed as student teachers and instructors as teacher students in Freire’s model? Some students already had degrees before they came to this university Students have knowledge from their life experience and therefore have some...

2 years ago

According to Freire’s pedagogy of the oppressed, the subject is : The person who is listening in the classroom The module being studied The person who does the teaching The student who is listening to the instructor

2 years ago

According to Freire’s pedagogy of the oppressed, the patient is : The student that is learning from the Professor The person who is sick A person who exercises great restraint A person who is being looked after

2 years ago

The education of the student is solely the responsibility of the lecturer. True False

2 years ago

Liberating education is characterised by the following: Teacher centric communication, problem posing, Socially Transformative Problem posing, Co- intentional Communication, Understanding reality together. Communiques, problem posing, understanding realit...

2 years ago

What does Friere write is the role of the teacher in traditional education? To help students To give students better jobs To ignore students To be an authoritarian figure

2 years ago

Matriarchy refers to: A form of social organization in which descent and relationship are reckoned through the female line. system of society or government in which men hold the power and women are largely excluded from it. a system of society or governme...

2 years ago

Gender-based Violence (GBV) refers to: The general term used to capture violence that occurs as a result of the normative role expectations associated with each gender. None of the above. Any violence that happens between a man and a women Violence that i...

2 years ago