09/04/18

Find the circumference and area of a circle with diameter 12 ft. Express your answer in terms of π.
I've tried working with this problem a few times but can't seem to figure it out.
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09/04/18

The area of a rectangle is 108.35 in2 and the length is 7.8 in. Find the width.
I'm having a hard time grasping the method they are teaching.  
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09/03/18

There are approximately 3.999 million births per year in the United States. Express this quantity in births per minute
What is the formula I should use to figure this out?
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09/03/18

A teacher has a helium gas cylinder outside in their garage, which is at 301 Kelvin.
A teacher has a helium gas cylinder outside in their garage, which is at 301 Kelvin. The gas cylinder holds 25.0 liters of helium gas at a pressure of 7,000. mmHg. How many 400 mL balloons, each... more
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09/03/18

A teacher has a helium gas cylinder outside in their garage, which is at 301 Kelvin.
A teacher has a helium gas cylinder outside in their garage, which is at 301 Kelvin. The gas cylinder holds 25.0 liters of helium gas at a pressure of 7,000. mmHg. How many 400 mL balloons, each... more
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09/03/18

A student measures 5.45 cm^3 of chloroform using a glass syringe. Given that the density of chloroform is 1.48 g/mL, and the molar mass is 119.38 g/mol, how man
How many moles of chloroform did the student measure?
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09/03/18

If a student reacts 4.40 mL of acetic acid with 3.35 mL of isopentyl alcohol and obtains 3.25 mL of isopentyl acetate as the product, what was the percent yield
Isopentyl acetate can be prepared by an esterification reaction using acetic acid and isopentyl alcohol. The balanced reaction is shown below. (Acetic acid has MW of 60.0 g/mol & density of... more
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09/03/18

An aqueous solution is 3.0M hydrochloric acid and has a density of 1.1 g/mL. How many mmol of hydrochloric acid are present in 25 mL of this solution
 Chem
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08/31/18

Chemistry Question
Can someone possibly help me answer this question? Which of the following combination of elementary substances may react to form a chemical compound made up of molecules? - C(s) and Br2(I) -I2(s)... more
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08/31/18

Which of the solution below is isoosmotic
100 mm of nacl  300 mm of nacl  250 mm of dextrose  150 mm nacl  500 mm calcl2    my answer is 3 rd one but I want to make sure I am right. Is it because calculation osmolarity dextrose does... more
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08/30/18

Specify what ions are present in solution upon dissolving each of the following substances in water.
(NH4)2SO4
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08/30/18

How many dg (decigrams) are in 8270kg?
the answer needs to be in scientific notation.
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08/30/18

Calcium 44 emits a beta particle, what element results?
Need to show the equation to solve this proble.
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08/30/18

Nobelium 102 emits a ganna Ray,what element results
Need to show the equation used to figu this problem out.
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08/29/18

Assume you used 0.200 g of salicylic acid and 0.480 mL of acetic anhydride, and you obtain 0.152 g of pure, recrystallized, dry aspirin.
Calculate the percent yield, clearly showing the calculations.
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08/29/18

How much does it cost to drive a mile in a car that averages 28mpg when a gallon costs $3.75?
This is simply a question given to me on a physics assignment. It says to use dimensional analysis but I don't understand how to use it in this case. 
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08/29/18

How many grams in this substance?
The density of a particular substance is 11.7 g/mL. How many grams would be in 12.5 mL of this substance?
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08/29/18

How many kilograms of gasoline fill a 13.6- gal gas tank?
I just need to know the set up like the conversions I suppose.
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08/29/18

What are the Magic Numbers for Atoms?
 Which one can be the possible Answer? A. No. Of e that confer Atomic Stability. B. n/p ratio that confer Nuclear stability. C. Atomic No. Confer Nuclear stability. D. Atomic mass indicates... more
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Bio

08/29/18

the sacral region is medial/lateral to the palmar region
the sacral region is medial/lateral to the palmar region
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Bio

08/29/18

the patellar region is posterior/anterior to the dorsal region
the patellar region is posterior/anterior to the dorsal region
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08/28/18

How many calories should come from fats?
A 1720 calorie diet should have a total of half the calories come from carbohydrates, 729 calories from protein and the rest from fats. How many calories come from fats?
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08/28/18

If it takes 1.00 hr and 52 minutes to drive from here to home (83 miles, at what rate are you traveling in cm/sec?
I just need help with this question. 
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08/28/18

Convert 250mg in 5ml to mg in 1ml
Please convert the above drug calculation
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08/28/18

Which statement best describes the relationship between activation energy and rate of reaction?
A.Increasing the activation energy can increase the rate of a reaction.B.Reducing the activation energy can increase the rate of a reaction.C.There is no relationship between activation energy and... more
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