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03/12/19

Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below:

Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below: 1) x + y = 32) the first ionization energy of B is probably lower than the first... more

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Chem Chemistry

03/11/19

In two separate experiments, researchers used laser beams to confine 400 atoms (each) of Na and K in a volume 1.0 x 10-15 m3 (for a fraction of a second) at a temperature of 0.00024K. How

In two separate experiments, researchers used laser beams to confine 400 atoms (each) of Na and K in a volume 1.0 x 10-15 m3 (for a fraction of a second) at a temperature of 0.00024K. How many... more

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Chem Biology Chemistry Biochemistry

03/11/19

How can dissolved materials be moved from the outside to the inside of a cell when the inside concentration of the material is higher than the outside concentration?

a. Molecules can be moved into a cell against their concentration gradient if that transport is coupled with osmotic transport of water into the cell.b. Substances can be moved against a... more

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Chem Science Chemistry

03/05/19

What is the minimum volume of 0.20 M lead(II) nitrate solution required to react with all of the iodide ion in 16.6 grams of potassium iodide dissolved in a solution?

A) 1.0 LB) 0.75 LC) 0.10 LD) 0.50 LE) 0.25 LPlease explain and show work!!

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Chem Chemistry

03/05/19

0.10 mole of solid calcium hydroxide is added to 1.00 liter of a 0.50 M solution of hydrochloric acid. After the reaction is complete, the hydrogen ion concentration of the solution will be:

A) 0.40 MB) 0.10 MC) 0.20 MD) 0.050 ME) 0.30 MPlease explain and show work! I've been stuck on this problem for ages

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Chem Chemistry

03/03/19

reaction vessel remaining?

For the following balanced chemical equation: 2 Mg (s) + O2 (g) → 2 MgO (s) 3.6 moles of Mg are put into a reaction container with 1.4 moles of O2 gas. The reaction is run until all of... more

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Chem Chemistry

03/03/19

oxidation or reduction?? either??

For the following balanced chemical equation: 2 Mg (s) + O2 (g) → 2 MgO (s) 3.6 moles of Mg are put into a reaction container with 1.4 moles of O2 gas. The reaction is run until all of... more

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Chem Chemistry

02/27/19

Consider the following reaction and select the FALSE statement.

Consider the following reaction and select the FALSE statement. 10 I-(aq) + 16 H+(aq) + 2 MnO4-(aq) --> 5 I2(s) + 2 Mn2+(aq) + 8 H2O(l)1) The iodine ion is the reducing agent2) This is a redox... more

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Chem Chemistry

02/27/19

A sample of gas occupies 3.00L STP . If the pressure is decrease to .5 atm what is the new volume of gas?

i need the answer and help cause my teacher doesn't teach

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Chem Chemistry

02/25/19

Select the true statement below regarding the following balanced reaction: MnO4-(aq) + NO(g) --> MnO2(s) + NO3-(aq)

Select the true statement below regarding the following balanced reaction: MnO4-(aq) + NO(g) --> MnO2(s) + NO3-(aq) 1) since a solid is formed, this is a redox reaction and a precipitation... more

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Chem Chemistry

02/25/19

Suppose a reaction A + B --> C occurs at some initial rate at 25°C. Which response includes all of the changes below that could increase the rate of this reaction?

Suppose a reaction A + B --> C occurs at some initial rate at 25°C. Which response includes all of the changes below that could increase the rate of this reaction? I. lowering the temperatureII.... more

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Chem Chemistry

02/25/19

Which of the following reactions would be expected to not only transfer thermal energy (heat) to the surroundings, but would also perform pressure-volume work on the surroundings?

Which of the following reactions would be expected to not only transfer thermal energy (heat) to the surroundings, but would also perform pressure-volume work on the surroundings?1) CO2(g) +... more

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Chem

02/25/19

The molar mass of an element is the mass of one

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Chem Chemistry

02/24/19

When 100 grams of He and 100 grams Ne are placed in a container, the partial pressure of Ne is found to be 3 atm. What is the partial pressure of He?

When 100 grams of He and 100 grams Ne are placed in a container, the partial pressure of Ne is found to be 3 atm. What is the partial pressure of He? The answer is 15 atm. Can someone please... more

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Chem Chemistry

02/22/19

Which of the following reactions releases thermal energy to the surroundings but does no significant pressure-volume work on the surroundings?

Which of the following reactions releases thermal energy to the surroundings but does no significant pressure-volume work on the surroundings?Reaction 1: CO2(g) + 2H2O(l) --> CH4(g) + 2O2(g) ΔH... more

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Chem Chemistry

02/22/19

A 100. g chunk of pure iron (specific heat capacity 0.444 J/°C*g) with an initial temperature of 100°C was

A 100. g chunk of pure iron (specific heat capacity 0.444 J/°C*g) with an initial temperature of 100°C was placed in a calorimeter containing 135 g of water (specific heat capacity 4.184 J/°C*g)... more

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Chem Chemistry

02/20/19

A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184 J/g K) at initial temperature 80 C. A salt weighing 5.852 g is quickly added.

A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184 J/g K) at initial temperature 80 C. A salt weighing 5.852 g is quickly added. The salt has a... more

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Chem Chemistry

02/16/19

Excess ice at 0°C is placed in an insulated cup containing 361 g of soft drink at 23°C. The specific heat of the drink is the same as that of water (4.184 J/g°C).

Excess ice at 0°C is placed in an insulated cup containing 361 g of soft drink at 23°C. The specific heat of the drink is the same as that of water (4.184 J/g°C). Some ice remains after the drink... more

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Chem Chemistry

02/16/19

In a constant-pressure calorimeter of negligible heat capacity, 25 mL of 1.00 M CaCl2 is mixed with 25 mL of 2.00 M KF, resulting in solid CaF2 precipitating out of the solution.

In a constant-pressure calorimeter of negligible heat capacity, 25 mL of 1.00 M CaCl2 is mixed with 25 mL of 2.00 M KF, resulting in solid CaF2 precipitating out of the solution. During this... more

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Chem Chemistry

02/16/19

A 5.000 g sample of a hydrocarbon (100.0 g/mol) is completely combusted in a bomb calorimeter with a heat capacity (excluding water) of 1500. J/°C.

A 5.000 g sample of a hydrocarbon (100.0 g/mol) is completely combusted in a bomb calorimeter with a heat capacity (excluding water) of 1500. J/°C. The calorimeter contains 2.500 kg of water (s =... more

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Chem Chemistry

02/16/19

When 1.0 g of snack cake is combusted in a constant-volume bomb calorimeter with a heat capacity (including its water) of 10.0 kJ/°C, the temperature of the calorimeter rises by 2.24°C.

When 1.0 g of snack cake is combusted in a constant-volume bomb calorimeter with a heat capacity (including its water) of 10.0 kJ/°C, the temperature of the calorimeter rises by 2.24°C. How many... more

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Chem Chemistry

02/16/19

What mass of a hot (85.0°C) aluminum rod (s = 0.900 J/°C•g) would need to be placed in 200. mL of water

What mass of a hot (85.0°C) aluminum rod (s = 0.900 J/°C•g) would need to be placed in 200. mL of water (density = 1.00 g/mL, s = 4.184 J/°C•g) in order to increase the temperature of the water... more

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Chem Chemistry

02/15/19

Chloroform, CHCl3, is formed by the following reaction: CH4(g) + 3 Cl2(g) → 3 HCl(g) + CHCl3 (g) Determine the enthalpy change for this reaction (ΔH°rxn)

Chloroform, CHCl3, is formed by the following reaction: CH4(g) + 3 Cl2(g) → 3 HCl(g) + CHCl3 (g) Determine the enthalpy change for this reaction (ΔH°rxn), using the enthalpy of formation of CHCl3... more

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Chem Chemistry

02/15/19

Determine the enthalpy change for the reaction 2C(s) + 2H2O(g) → CH4(g) + CO2(g) using the following:

Determine the enthalpy change for the reaction 2C(s) + 2H2O(g) → CH4(g) + CO2(g) using the following: C(s) + H2O(g) → CO(g) + H2(g) ΔH° = 131.3 kJ CO(g) + H2O(g) → CO2(g) + H2(g) ΔH° = 41.2 kJ ... more

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Chem Chemistry

02/15/19

The standard molar enthalpy of formation for gaseous H2O is −241.8 kJ/mol. What is the standard molar enthalpy of formation for liquid hydrazine (N2H4)?

The standard molar enthalpy of formation for gaseous H2O is −241.8 kJ/mol. What is the standard molar enthalpy of formation for liquid hydrazine (N2H4)? N2H4(l) + O2(g) → N2(g) +... more

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Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below:

In two separate experiments, researchers used laser beams to confine 400 atoms (each) of Na and K in a volume 1.0 x 10-15 m3 (for a fraction of a second) at a temperature of 0.00024K. How

How can dissolved materials be moved from the outside to the inside of a cell when the inside concentration of the material is higher than the outside concentration?

What is the minimum volume of 0.20 M lead(II) nitrate solution required to react with all of the iodide ion in 16.6 grams of potassium iodide dissolved in a solution?

0.10 mole of solid calcium hydroxide is added to 1.00 liter of a 0.50 M solution of hydrochloric acid. After the reaction is complete, the hydrogen ion concentration of the solution will be:

reaction vessel remaining?

oxidation or reduction?? either??

Consider the following reaction and select the FALSE statement.

A sample of gas occupies 3.00L STP . If the pressure is decrease to .5 atm what is the new volume of gas?

Select the true statement below regarding the following balanced reaction: MnO4-(aq) + NO(g) --> MnO2(s) + NO3-(aq)

Suppose a reaction A + B --> C occurs at some initial rate at 25°C. Which response includes all of the changes below that could increase the rate of this reaction?

Which of the following reactions would be expected to not only transfer thermal energy (heat) to the surroundings, but would also perform pressure-volume work on the surroundings?

The molar mass of an element is the mass of one

When 100 grams of He and 100 grams Ne are placed in a container, the partial pressure of Ne is found to be 3 atm. What is the partial pressure of He?

Which of the following reactions releases thermal energy to the surroundings but does no significant pressure-volume work on the surroundings?

A 100. g chunk of pure iron (specific heat capacity 0.444 J/°C*g) with an initial temperature of 100°C was

A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184 J/g K) at initial temperature 80 C. A salt weighing 5.852 g is quickly added.

Excess ice at 0°C is placed in an insulated cup containing 361 g of soft drink at 23°C. The specific heat of the drink is the same as that of water (4.184 J/g°C).

In a constant-pressure calorimeter of negligible heat capacity, 25 mL of 1.00 M CaCl2 is mixed with 25 mL of 2.00 M KF, resulting in solid CaF2 precipitating out of the solution.

A 5.000 g sample of a hydrocarbon (100.0 g/mol) is completely combusted in a bomb calorimeter with a heat capacity (excluding water) of 1500. J/°C.

When 1.0 g of snack cake is combusted in a constant-volume bomb calorimeter with a heat capacity (including its water) of 10.0 kJ/°C, the temperature of the calorimeter rises by 2.24°C.

What mass of a hot (85.0°C) aluminum rod (s = 0.900 J/°C•g) would need to be placed in 200. mL of water

Chloroform, CHCl3, is formed by the following reaction: CH4(g) + 3 Cl2(g) → 3 HCl(g) + CHCl3 (g) Determine the enthalpy change for this reaction (ΔH°rxn)

Determine the enthalpy change for the reaction 2C(s) + 2H2O(g) → CH4(g) + CO2(g) using the following:

The standard molar enthalpy of formation for gaseous H2O is −241.8 kJ/mol. What is the standard molar enthalpy of formation for liquid hydrazine (N2H4)?

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