10/19/20

the sum of a number times 10 and 28 is at most 19
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10/19/20

Relation & function

If f(x) =x^2 - 2x, find: f(-3)=
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10/19/20

If 74.5 g of ammonium nitrate was the actual amount obtained in a reaction for which the percent yield was 87.2% what is the theatrical yield
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10/19/20

If you wanted to cover (as nearly as possible) the floor of a 6-foot by 8-foot room with one thickness of nickels, how many nickels would it take?

If you wanted to cover (as nearly as possible) the floor of a 6-foot by 8-foot room with one thickness of nickels, how many nickels would it take? After you have done this, if you gathered up the... more
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10/18/20

Energy Unit Conversions
A tank contains 386 gallons of oil. This is the equivalent of 5.65×107 kJ of energy. How many kWh of energy does this oil represent?
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10/17/20

How would you convert this equation to sum of cubes?
b^2(a+b) - (ab(b-a) + a^2(b-a))
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10/17/20

Measured Temperature Change
If the volume of  and NaOH is doubled (100 mL) while keeping the concentration the same (1 M), the measured temperature change will beaDouble since more mols are reactingbSame since both qsol and... more
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10/17/20

A silver cube with an edge length of 2.25 cm and a gold cube with an edge length of 2.63 cm are both heated to 81.6∘C and placed in 119.0 mL of water at 20.3 ∘C.
substance Specific heat (J/g·°C)Density (g/cm3) density g/cm^3) gold 0.1256 19.3 silver 0.2386 10.5 water 4.184 1.00 What is the final temperature of the water when thermal equilibrium... more
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10/17/20

When 0.813 g of sodium metal is added to an excess of hydrochloric acid, 8450 J of heat are produced. What is the enthalpy of the reaction as written? 2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)
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10/17/20

A 3.985 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 24.17 ∘C to 30.90 ∘C.
The heat capacity (calorimeter constant) of the calorimeter is 43.07 kJ/ ∘C, what is the heat of combustion per gram of the material?
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10/16/20

a varies directly as b and inversely as the square of c
If a = 229 when b = 4 and c = 2, find a if b = 6 and c = 5Round your answer to two decimal places if necessary.
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10/16/20

How many milliliters?
How many milliliters of 3.00 M calcium hydroxide is required to neutralize 810. mL of 1.10 M hydroiodic acid?
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10/16/20

5 Stoichiometry questions Please help
1(a) sodium and water react to give sodium hydroxide and hydrogen gas, H2 and 1.15 grams of sodium were added to excess oxygen and produced 1.6grams of sodium hydroxide. What was the percentage... more
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10/16/20

Coffee-Cup calorimeter? Please check my answer! :)
When a neutralization reaction is carried out in a coffee-cup calorimeter, the temperature of the solution after reaction, Tf, would beaCannot determinebLowercThe... more
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10/16/20

Video games math
A video game store allows customers to rent games for 4.75 each customers can also buy a membership for $54 annually and video games would only cost $2.50 each write and solve an equation to find... more
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10/16/20

Geometry in High School
What is the equation of the line that passes through (-3, 2) and is parallel to the graphed equation?
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10/16/20

Temperature change? Check my answer please.
Predict how the temperature change that you measure for 25 mL of 1 M NaOH added to 25 mL of 1 M hydrochloric acid compare to the temperature change when 50 mL of 1 M NaOH is added to 50 mL of 1 M... more
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10/16/20

Addie had $3.25 in fine and quarters. Her number of dimes is 8 more than her number of quarters, how many of each coin does she have?
PLEASE ANSWER! (Addie had $3.25 in fine and quarters. Her number of dimes is 8 more than her number of quarters, how many of each coin does she have?)
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10/16/20

Is this correct chemical calculation? Check please
It will perform a titration to determine the molar concentration of a NaOH solution.The balanced equation for the reaction is shown below:H2C2O4 + 2 NaOH → Na2C2O4 + 2 H2OHow many moles of NaOH... more
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10/16/20

Calculate the mass percent composition for each of the following compounds: separate answers by a comma

a) 3.40 g of NA, 2.54 g of S and 3.81 g of Ob)0.500 g of C and  0.043 g of H c)0.880 of Na g,  1.40 of Cl g and 1.89 g of O 
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10/16/20

Calculate the mass percent composition for each of the following compounds: separate answer by commas
a) 3.85  of  Ca and 3.90  of Fb) 0.340 g of Na and 0.215g of Oc) 12.4 of K, 17.5 g of Mn and 20.3 g of O 
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10/16/20

Explain How Stoichiometry is done
Hello I have a hard time with stoichiometry and would like to know how to do it the topic is very difficult for me and i get lost on the simple things so starting from the beginning would be great... more
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10/16/20

Isothermal Titration Calorimeter
Is it much like a coffee cup setup? Can it detect the heat absorbed or released from a chemical reaction? Can it be used to heat and melt metals? Can the instrument object a small volume of... more
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10/15/20

In PowerPoint, how do you add music?
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10/13/20

math question for geometry

Write the equation of a line perpendicular to y = 1/3x - 9 that passes through the points (-6, 10).
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