04/15/21

astronomy questions
the eccentricity of an ellipse is always a fraction, btw 1 and 0, and it has no units.true/false?
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04/15/21

where do i even start with this one
convert the rectangular coordinate pair (4, -7) to two different sets of polar coordinates, one with a positive r-value and one with a negative r-value.
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04/11/21

Can i get help?
A can of chicken broth contains 470 mg of sodium chloride in 282.5 g of broth. What is the percent by mass of sodium chloride in the broth?
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04/11/21

How do you solve for volume conversions and empirical formula?
1. The combustion of propane gas produces carbon dioxide and water vapor.                     C3H8(g)  +  5 O2(g)  →  3 CO2(g)  +  4 H2O(g)(A) What volume of oxygen is required to completely... more
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04/10/21

A ship leaves port and travels 30 miles at a bearing of N42°E. The ship then changes direction to a bearing of S50°E and continues for another 50 miles.
find the bearing from the ship back to the home port , and find the distance to the port.
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04/10/21

Speedometer readings for a vehicle (in motion) at 6-second intervals are given in the table.

t(sec) v(ft/s)0 296 3212 1818 3224 1930 23Estimate the distance... more
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04/08/21

chemistry stoichiometry

In order to produce 495 g of water, how many liters of oxygen gas are required if the oxygen is at 116.57 kPa and 32 degrees Celsius?
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04/08/21

C6H12O6 (aq) 🡪 2 C2H5OH (aq) + 2 CO2 (g)
How many moles of CO2 are produced when 0.200 mol of C6H12O6 reacts in this fashion?How many grams of C6H12O6 are need to form 8.50 g of C2H5OH?How many grams of CO2 form when 8.50 g of C2H5OH are... more
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04/08/21

chem help please
If 6.6 L of ammonia at STP react with excess oxygen, how many grams of water are produced?
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04/08/21

chem help please
Ammonia reacts with oxygen to make nitrogen gas and water. What is the coefficient in front of water in the balanced chemical equation?
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04/08/21

Unit 6 Practice Problems
How many grams of water are created when 3.70 moles of oxygen are fully burnt with propane?C3H8 + 5O2 ---> 3CO2 + 4H2O 3.70      
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04/08/21

Unit 6 Practice Problems
Na2CO3 + 2HCl ---> 2NaCl + H2O + CO2If the reaction above produced an actual yield of 5.67 g of sodium chloride in the lab, which resulted in a 73.3% yield, how many grams of sodium carbonate... more
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04/07/21

A stone is thrown straight up from the edge of a roof, 775 feet above the ground, at a speed of 16 feet per second.

A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 3 seconds later? B. At what time does the stone hit the ground? C. What is the velocity... more
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04/06/21

Chemistry questions below
The label fell off a tank of compressed gas. Although the colour of the tank provides information about the identity of the gas, the company selling the gas wanted to confirm what gas is in the... more
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04/06/21

gas laws assessment
A sample of oxygen gas that occupies 235.0 mL at 105.63 kpa is subjected to a pressure of 0.872 atm. What will the final volume of the sample be if the temperature is held constant?
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04/06/21

Spectrum and Wavelength calculations
9. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 x1014 Hz. Calculate the wavelength, in nm, associated with this... more
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04/06/21

Spectrum and Wavelength calculations
8. A certain electromagnetic wave has a wavelength of 625 nm (1m = 109 nm).What is the frequency of the wave?
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04/06/21

DISTANCE AND DISPLACEMENT
I. A car moving along in a straight highway from point P to point Q to point R and to point S, then back to point Q and finally to point S as shown in the figure below.a) Find the distance... more
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04/04/21

Calculus Question

Your velocity is given by v(t)=1t^2+2 in m/sec, with t in seconds. Estimate the distance, s, traveled between t=0 and t=8. Use the average of the left and right sums with 4 subdivisions. Answer: s=
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04/04/21

Calculus Quesiton
Your velocity is given by v(t)=2t^2+2 in m/sec, with t in seconds. Estimate the distance, s, traveled between t=0 and t=8. Use the average of the left and right sums with 4 subdivisions. Answer: s=
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04/04/21

The temperature outside is 33 ∘C , and the air pressure is 0.700 atm . Your neighbor, who released the balloon, tells you that he filled it with 4.20 moles of gas.

What is the volume of gas inside this balloon?
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04/04/21

If an HPLC procedure is running at a pressure of 2.34×108 Pa , what is its running pressure in torr?
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04/04/21

A box weighing 6kg is pushed to the left at a constant speed
The coefficient of friction is 0.78. What is the force with which the hand pushes the box?
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04/02/21

chem question help 21-3
The following chemical equation has NOT been balanced. H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O How many grams of calcium hydroxide are needed to produce 17.94 grams of water?Answer value
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04/02/21

CHEMISTRY HELP PLS 20-2
If 10.8 moles of sodium nitrate react with excess iron(III) chloride, how many moles of iron(III) nitrate can theoretically be made?
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