4,349 Answered Questions for the topic Science

Science Chemistry

12/04/22

Can someone please help with this chem question

A mixture of calcium chloride and calcium chlorate was treated according to the procedure used in this exercise. An initial mass of 1.093g of the salt mixture, brought to a constant mass after... more
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12/04/22

If 14 g of a radioactive substance are present initially and 4 yr later only 7.0 remain, how much of the substance, to the nearest tenth of a gram, will be present after 7 yr?
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Science

12/02/22

If you lift 1 kg iron and 1 kg cotton what is more heavier in lifting?
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12/01/22

How to calculate the Percentage of moisture loss
Hello,i know this might be simple, but i need help so i know how to do it going forward. I did an experiment and here are my data. The sample is a dry ingredient. Weigh of tray= 6.40g weigh of... more
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Science Chemistry

12/01/22

How do I balance the following chemical equation?
____CH4 + ___ O2 → ___ CO2 + ___ H2O + ___ C + ___ CO
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Science Physiology

11/30/22

Which of the following occurs with age?

A. thinning of the intima B. reduced vascular conductance in response to increased noradrenaline C. reduced pulse wave velocity D. increased sensitivity to therapeutic intervention to treat... more
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Science Physiology

11/30/22

Describe THREE (3) ways in which antibodies can be used and modified to induce tumour cell death.
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Science Chemistry

11/28/22

4.00 mL of a 1.50E-3 M solution of crystal violet is mixed with 8.00 mL of water. What is the concentration of the resulting solution (in units of M)?
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Science Math Physics

11/27/22

Approximately how many times louder is the latter sound?
The sound level measured in a room by a person watching a movie on a home theater system varies from 40 dB during a quiet part to 80 dB during a loud part. Approximately how many times louder is... more
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Science Math Physics

11/27/22

How far away are the fish?
A sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.23 s later (see the figure below). How far away are the fish? (Assume the water temperature is 20°C.) more
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Science Math Physics

11/27/22

What is the size of the smallest feature observable in human tissue when examined with 18-MHz ultrasound?
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human... more
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Science Math Physics

11/27/22

How many times louder?
Approximately how many times louder is a 140-dB sound than a 80-dB sound?
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Science Math Physics

11/23/22

What is the total mass (in kg) of water vapor in the air in the apartment?
An apartment has the dimensions 19 m by 10 m by 6 m. The temperature is 20°C, and the relative humidity is 50 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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Science Math Physics

11/23/22

At what temperature would the wing
An aluminum wing on a passenger jet is 26 m long when its temperature is 21°C. At what temperature would the wing be 6 cm (0.06 m) shorter?
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11/23/22

To achieve the required HLB of 11.5, what proportion of Tween 60 (HLB 14.9) and Span 20 (HLB 3.7) should be blended?
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11/23/22

Determine the HLB of a mixture of 45 grams of Span 80 (HLB 4.3) and 105 grams of polysorbate 80 (HLB 15).
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11/23/22

What is the HLB of an emulsifier blend consisting of 25 % of Span 20 (HLB 8.6) and 75 % of Tween 20 (HLB 16.7)?
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11/20/22

If the dose of a drug is 200 mg, how many doses are contained in 10g?
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Science Macroeconomics

11/19/22

Does this make sense? Is it true?
The average quantity of words, time, energy, and money anyone can save by speaking or writing concisely is 20%.By articulating concisely you can reduce sentences such as, “Never use a longer word... more
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11/18/22

Is Peppa Pig A Pig, Bacon, Drawing, Or A Cartoon?
WHAT IS SHE?
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11/16/22

Mathematical Conversion Oceanography Coastal Equation
The drainage basin of the Delaware River encompasses about 35,500 km^2 (= 35 x 109 m^2). The average annual precipitation for the drainage area is about 44 inches/year (= ~1.1 m/yr) and the... more
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11/16/22

What is the difference between a narrow and a wide QRS complex?

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Science Math Chemistry

11/15/22

Balancing Chemical Equation HARD (do not give answer just help)
I enjoy balancing chemical equations for fun but I cannot figure this out. I know I am stubborn but I refuse to look up the answer. I want to do it without "cheating" I need some help. again please... more
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Science Chemistry

11/15/22

what will be the butadiene concentration after 71.0 min?
Butadiene reacts to form a dimer according to the equation 2C₄H₆(g) → C₈H₁₂(g) The reaction obeys the second order rate law, Rate = k[C₄H₆]², with a rate constant k = 3.68 M⁻¹min⁻¹ at a certain... more
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Science Chemistry

11/15/22

A first order reaction initially contains 3.25 × 10²⁰ molecules. If the reaction has a half-life of 20.0 minutes, how many molecules remain unreacted after 80.0 minutes?
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