4,347 Answered Questions for the topic Science

05/28/21

please help me with this solutions problem for honors chemistry
Which of the following solutions will be the poorest conductor of electrical current?A. sulfuric acid, H2SO4(aq)B. lithium hydroxide, LiOH(aq)     C. sodium chloride, NaCl(aq)D. potassium nitrate,... more
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05/28/21

Please help with honors chemistry solutions problem
Which must be present in an aqueous solution for it to conduct an electric current?a. acidb. base    c. ionsd. molecules
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05/27/21

How Can changes to the information held in a DNA molecule or the amount of DNA in a cell affect protein and cell function and trait variation?
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Science Chemistry

05/26/21

3.25 g of C3H8 react with 3.50 g of O2.How many grams of H2O are formed? How much of the excess reactant, in grams, remains after the reaction?

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05/26/21

If you were doing recombinant DNA with animals, why would you include a gene for GFP (green fluorescent protein) rather than AMP (ampicillin resistant)?
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Science Math Biology

05/26/21

answer these below please! copy and paste the image links into your browser for refrences!
Hemophilia is a sex-linked trait. The gene for Hemophilia is recessive and found on the X chromosome. The pedigree below tracks hemophilia through generations of a family. What is the genotype of... more
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05/26/21

Chemistry question please if anyone can help I really need it
___NH3+___O2----> ____ NO +____H2O In an experiment 5.03g of NH3 are allowed to react with 8.78g of O2 . Write the formula of the limiting reagent ANSWER ____ 2 How many grams of NO are formed... more
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05/25/21

Help me with gas chemistry please

A balloon has a volume of 150 mL. If the pressure is kept constant, while the temperature is halved, the volume of the balloon:A. Will also be doubledB. Will be halved   C.  Will be squaredD. Will... more
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05/25/21

please help me with the gas laws in chemistry

Which of the following is true if the temperature of the gas in a cylinder is increased, while the number of moles of gas and volume of the container remains the same? Select all that apply.A.... more
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05/25/21

please hep me with this math problem of gas laws for chemistry

A sample of sulfur hexafluoride gas occupies 5.84 L at 198°C. Assuming the pressure remains constant, what temperature (in °C) is needed to reduce the volume to 2.83 L? Answer in units of °C
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05/25/21

Help me with gas laws in chemistry with math
A 75 L sample of dry air cools from 147°C to -37°C while the pressure is maintained at 2.85 atm. What is the final volume?Answer in units of  L
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05/25/21

please help me with gas laws of chemistry

Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa.A. 65.2°CB.77.2°C     C. 95.0°CD. 72.9°CE. 85.1°C
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05/25/21

please help me with gas laws in chemistry

Explain why a helium weather balloon expands as it rises in the air. Assume that the temperature remains constant.A. The atmospheric pressure outside the balloon increases, and the gas inside... more
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05/25/21

please help me with chemistry gas laws
Why do astronauts have to wear protective suits when they are on the surface of the moon? (Select all that apply.)A. The temperatures are too cold, or too hot, to sustain life for long; and there... more
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05/25/21

help with gas laws please

Give the common units for pressure.A. mmHg, atm, kPaB. mmH2O, atm, Pa    C.mmHg, atm, litersD. mmH2O atm, kPa
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05/25/21

Please hep with gas laws

Which is not a physical characteristic of gases?A. Gases are the most compressible of the states of matter.B. Gases assume the volume and shape of their containers.    C. Gases will mix evenly and... more
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05/24/21

What is the greatest amount of water in grams that can be produced 215 grams of C7H16 and 87 grams O2? Which reactant is limiting? How many grams of the excess reactant will be left?
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05/24/21

Anatomy and Physiology

Approximately how many MORE high volume cholecystectomy surgeries were performed in 2007 than 1998?
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05/24/21

Anatomy and physiology

What country spends the most on research and development for GERD? Aka gastroesophageal reflux disease
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05/24/21

Anatomy and Physiology

Approximately, how many more IBS surgeries were performed in 2007 than 2001?
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05/24/21

Anatomy and Physiology

What age group of women is most at risk for peptic ulcers?
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05/24/21

Anatomy and physiology

In 2006, what region in the U.S had the highest incidence rate of colorectal cancer? Why do you think this was?
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Science Chemistry

05/24/21

Acetylene, C2H2, combusts in the presence of oxygen to form carbon dioxide and steam as shown in the following reaction.

2 C2H2 + 5 O2 → 4 CO2 + 2 H2O ΔH° = -2511.6 kJ/molrxnCalculate the amount of energy released when 39.0 g C2H2 reacts with excess oxygen.
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Science Chemistry

05/24/21

How many grams of oxygen are required to convert 11.2 L of CO into CO2? Assume STP.
Reaction: 2 CO + O2 --> 2 CO2
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05/24/21

Using EcoRI, which cuts at 5' GAATTC 3', indicate how many strands would be produced?
5’ A G A A T T C G C T T A A G T C G A C G T A A G C C G G A A T T C C A T T C G A A T T A G 3’ 3’ T C T T A A G C G A A T T C A G C T G C A T T C G G C C T T A A G G T A A G C T T A A T C 5’ Using... more
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