12/08/20

please help me please
Ms. Kubena discovered a new element and named it Kubena (Ku) after herself. This new element has two naturally occurring isotopes. One has a mass number of 65 and a percent abundance of 23%. The... more
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12/08/20

please help me please
A student is studying a mystery element and observes two distinct bands in the element's emission spectrum (shown below). One band appears at a wavelength of 450 nm while the other appears at a... more
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12/08/20

How many milliliters of 0.125 M HCl are needed to completely neutralize 43.0 mL of 0.100 M Ba(OH)2 solution? Express the volume in milliliters to three significant digits.
It is solution stoich. I have tried 5 times and I still cant seem to get the formula right, some help would really be appreciated.
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12/08/20

Which sounds better this table and chair was made by hand in Mexico or this table and chairs were made by hand in Mexico

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12/08/20

Three times the sum of a number and 6 is 5.
translate the sentence into an equation
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12/05/20

Proportion Word problem- I think i have right answer can someone confirm?
Digorno sold $526.13 million worth of frozen pizzas. If the total frozen pizza sales were $3,193.4 million, what percent of frozen pizza sales were due to Digorno?I got 16.48%-- is this close?
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12/04/20

How many moles of atoms are in 28.7 g Ar?

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12/04/20

955 grams of water at 25.0 C is heated to 85.5 C. Calculate the amount for Q in Joules?

a.57800 Jb. 242000 Jc. -57800 Jd. -242000 J
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12/04/20

Which sublevels are full when an atom has a noble gas configuration?
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12/03/20

Chemistry for Engineers Gas Law's
Determine the property/ies of gases changed in following situations. Then, explain why these properties are shown in a given situations. A. Pressure B. Temperature C. Amount of Substance D.... more
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11/30/20

what slope makes y=5x+2 perpendicular ?
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11/30/20

what makes y+10= -2/7(x-5) perpendicular ?

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11/30/20

Unit Price cant figure our this specific question
A certain shampoo is available in two sizes. A 14.2-ounce bottle costs $3.98. A 33.9-ounce bottle costs $9.98.Find the unit price for each size. Then state which size is the better buy based on the... more
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11/30/20

how do i answer this question? its kinda hard
A store sells T-shirts for $14 each and shorts for $18 each.Write an algebraic expression to find the total revenue if they sell x t shirts and y shorts
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11/30/20

If 0.77 moles of an ideal gas occupies 0.042 L at 11.0 atm, what is the temperature of the gas in Kelvins?

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11/30/20

A gas at 0.98 atm and 35 oC is heated to 96 oC. Assuming there is no change in volume, what is the new pressure in atm?
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11/27/20

Please help me with this chemistry question!
Use Hess's Law to completeShow all the steps2 C (s) + 2 H2 (g) = C2H4 (g) 1) C (s) + O2 (g) -------> CO2 (g) Delta H= -393.5 kJ2) H2 (g) + 1/2 O2 (g) -------> H2O (i) Delta H=... more
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11/27/20

please help me HURRY I need the answer
A student placed 50.0 Ml of 2.05 mol/L NaOH in a coffee cup calorimeter at 20.4 degress celcius, and added 50.0 mL of 1.20 mol/L H2SO4 also at 20.4 degrees Celsius. After quickly stirring the... more
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11/26/20

minimum cost of 30 coolers
The cost, C, of producing x Totally Cool Coolers is modeled by the equationc=0.005x^2-0.3x+11The cost is at a minimum after 30Correct coolers are produced and sold. What is the cost? (Round answer... more
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11/25/20

Chemistry homework question
The pressure of a sample of argon gas was increased from  to  at constant temperature. If the final volume of the argon sample was  what was the initial volume of the argon sample? Assume... more
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11/24/20

Maths grammar please help~
A row got 8 seats, we have only 5 people.Question:There are ___ people in the row not yet completely filled up.The answer is 5 or 3 ?Thanks.
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11/23/20

Application problem with a linear function: Finding a coordinate given two points
The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 36 minutes of calls is $19.96, and the... more
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11/23/20

I NEED HELP PLEASE! :((((
1. How many moles of neon atoms are there in 2.0 x 10^23 atoms of neon?2. How many carbon atoms are there in 0.50 mol of C?3. How many hydrogen atoms are there in 4.0 mol of H2O?
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11/23/20

arithmetic and composition problem (help is much appreciated!)
The area of a circular wave expands across a still pond such that its radius increases by 9 cm each second. Write a formula for the area A of the circle as a function of time t since the wave... more
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11/23/20

A 2.5 g sample of a pretzel is burned completely. The heat it gives off is used to heat 45 g of water from 22 °C to 51 °C. What is the energy value of the pretzel in kcal/g
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