4,347 Answered Questions for the topic Science

Science Math Physics

07/22/21

Calculate the initial and final kinetic energy of the car in the example below.
A car of mass 12100kg is travelling at 15m/s. The driver sees that the traffic light ahead has changed to red and applies the brakes, bringing the car to a stop.A) Calculate the initial and final... more
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Science Chemistry

07/21/21

Can someone please check over my answers to these Chemistry questions?
1. Force per unit of area is the definition of _______.A. standard temperature and pressureB. pressureC. vapor pressureD. volumeE. None of the Above 2. The ideal gas constant R can be denoted as... more
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Science Chemistry

07/21/21

Can someone please check-over my answers to these Chemistry problems?
For the following questions, use the information given below. Units of Pressure   Atmosphere (atm)   Kilopascals (kPa)     Millimeters of Mercury (mm Hg)     Torr (torr)    1.000 atm 101.3... more
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07/21/21

What statistical test can I use?

I want to measure the increase of Fetal haemoglobin in patients in a few case studies before and after they use a specific drug. I am taking data from 5 studies, what test can I use and how can I... more
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07/21/21

Independent and Dependent Variables
Hello, I'm supposed to define the independent and dependent variables of a research study.Objectives of the Study: Analyzing ethnic and racial disparities in mental health service access and use at... more
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07/20/21

Physics problem find initial velocity
Given the equation of the moving body s=3t2+2t+1 (in SI units), find its initial velocity (at t=0). Correct answer: 2 m/s
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Science Chemistry

07/18/21

Can someone please check-over my answers to these Chemistry questions?
1. Vapor pressure of any liquid _______.A. increases with increases in temperatureB. increases with decreases in temperatureC. is not affected by changes in temperatureD. increases with increases... more
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Science Chemistry

07/18/21

Are my answers to these Chemistry questions correct?
1. _______ states that for constant temperature, the product of gas volume and gas pressure always remains constant.A. Boyle’s LawB. Charles’s LawC. The Combined Gas LawD. The Ideal Gas LawE. None... more
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Science Chemistry

07/18/21

Can someone please check-over my answers to these Chemistry questions?
 The unit of pressure that represents the force exerted by the atmosphere at sea level is _______.A. 101.3 kPaB. 1.000 atmC. 760.0 torrD. 760.0 mm HgE. All of the Above 2. The units designated as... more
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Science Chemistry

07/17/21

Can someone please check-over my answers to these Chemistry problems?
1. What is the molality of a solution in which 1.50 × 102 g of Magnesium Nitrate, Mg(NO3)2, are dissolved in 400.0 g of warm water?A. 0.5 mB. 0.5 MC. 2.53 mD. 2.53 ME. None of the Above 2. How many... more
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Science Chemistry

07/17/21

Are my answers to these Chemistry problems correct?
1. What is the molality of a solution formed when 80.0 moles of Potassium Hydroxide (KOH) are mixed with 5.4 kg of water?A. 1.5 MB. 1.5 mC. 14.8 mD. 14.8 ME. None of the Above 2. For the reaction... more
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Science Chemistry

07/17/21

Can someone please make sure my answers to these Chemistry questions are correct? I just want to make sure I'm understanding everything.
1. An increase in temperature _______.A. increases the solubility of a solidB. decreases the solubility of a solidC. increases the solubility of a liquidD. decreases the solubility of a liquidE.... more
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Science Chemistry

07/17/21

Can someone please check-over my answers to these Chemistry problems? (My answers are in bold.)
1. Molality (m) is _______.A. the number of moles of solute / the number of kilograms of solventB. the number of kilograms of solvent / the number of moles of soluteC. the number of moles of a... more
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Science Chemistry

07/16/21

Chemistry order of reaction
What is the order of reaction with respect to each reactant and the overall order of the reactions for each of the following:a)     R = k[A]b)     R = k[A][B]c)     R = k[A][B]2
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Science

07/16/21

I need your help. Thank you so much!
Think about a favorite fruit, vegetable, or nut that you love. Maybe you love mangos or papayas? Or maybe you really love cashews. Many of the foods we enjoy are imported to the United States... more
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Science Chemistry

07/10/21

Are my answers to these Chemistry problems correct? I know it's a lot, but I just want to make sure I don't get them wrong. I would really appreciate the help!
My answers to these problems are in bold.What is the concentration of an Ammonia (NH3) solution when 25.0 g of Ammonia are dissolved in enough water to produce 650.0 mL of solution?A. 2.26 MB.... more
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Science Chemistry

07/10/21

Can someone please check-over my answers to these Chemistry problems?
(My answers are in bold.)Which of these acids is diprotic?A. HNO3B. H2CO3C. H3PO4D. HSO4–E. All of the AboveWhich of these acids is triprotic?A. HNO3B. H2CO3C. H3PO4D. HSO4–E. None of the... more
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Science Chemistry

07/10/21

Are my answers to these Chemistry problems correct?
For the following questions, give the molar concentration (M) for each of the solutions indicated. (My answers are in bold.)2.22 moles of HCl are dissolved in enough water to make 1.5 liters of... more
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Science Chemistry

07/10/21

Can someone please check-over my answers to these Chemistry problems?
(My answers are in bold.)The reaction of an acid and a base produces a(n) _______ and water.A. titrationB. molar solutionC. dilute solutionD. mixtureE. None of the AboveIdentify the base in the... more
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Science Biology

07/10/21

can you please help me with this earth science questions
In December, a city in the Southern Hemisphere has warm weather all month long.What causes this to happen?A. The city experiences fewer hours of daylight.B. The city is experiencing a winter... more
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07/06/21

Molarity chemistry

If 0.96 moles of NaCl are dissolved to make 1.4 L of solution, what is the molarity?
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Science Biology

07/06/21

URGENT: please answer this earth science monsoon question please

Which statement best describes monsoons?A. They force cool, moist air from oceans to rise.B. They are winds that blow in the opposite direction of a normal wind.C. They bring heavy rain in the... more
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07/04/21

chemistry volume

If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900. K, what will be the volume of the gas if I decrease the pressure to 52 atm and decrease the temperature to 750 K?
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07/04/21

chemistry volume of gas

I have an unknown volume of gas at a pressure of 0.50 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and measure the final volume to be 48... more
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07/04/21

chemistry pressure and volume

If I have 17.0 liters of gas at a temperature of 67.0 °C and a pressure of 88.89 atm, what will be the pressure of the gas if I raise the temperature to 94.0 °C and decrease the volume to 12.0 L?
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