3,202 Answered Questions for the topic Science

Science Chemistry Chem

1d

Consider the following equilibrium

4NH3 + 3O2 <--> 2N2 + 6H2O∆H= -1531 kJa) State whether the concentration of the reactants and products would increase, decrease,or remain constant when:1) the temperature of the system is... more
Science Physics

1d

For a magnifying glass, F is 24 cm from the lens. The magnifying glass is held 17 cm in front of a seashell.

Calculate the location of the image and state its characteristics.Determine the magnification of the magnifying glass.

Oxidation Question: Chemistry

What is the oxidation number of chlorine in each anion? OCI- CIO4- CI- CI2 HCI thank you in advance for the help :)

Redox Reaction Question

Identify the oxidizing agent and the reducing agent in the following redox reaction. Explain the answerBrO3- + I- + H+ ---> Br- + I2 + H2O

How to balance the following redox reaction using half-reaction method

How to balance the following redox reaction using half-reaction method under basic conditionsSn(OH)42- + MnO4- ---> MnO2 + Sn(OH)62-thank u for taking the time to help me with this question
Science Math Physics

1d

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
Science Chemistry

2d

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
Science Chemistry

2d

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

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

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

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
Science Chemistry

5d

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
Science Chemistry

5d

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
Science Chemistry

5d

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
Science Chemistry

6d

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
Science Chemistry

6d

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
Science Chemistry

6d

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
Science Chemistry

6d

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
Science Chemistry

7d

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
Science Chemistry

13d

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
Science Chemistry

13d

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
Science Chemistry

13d

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
Science Chemistry

13d

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
Science Biology

13d

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

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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