4,374 Answered Questions for the topic Science

01/20/21

Halogenalkanes properties?
What are Halogenalkanes? What type of intermolecular force do they have and like why do they have such low boiling points? Heard the number of carbon in the chain plays a big role in this but I... more
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01/20/21

Molecule Polarity Arranging?

Arrange the following substances according to increasing polarity.With Motivation/Justification.a) PH3, NH3, SbH3, AsH3b) Cl2, HF, H2Oc) AlCl3, KCl, Cl2, PCI3thanks for any answer in advance!
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01/20/21

Chemical reactions?
How do you balance and name chemical reactions? What are the rules and steps? Also how do you predict the products? For example- B2O3+NaOH——Na2BO3+H2O ? How you do you balance and name this?
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01/20/21

Combustion of C13H18O2?

Ibuprofen is an anti-inflammatory medicine write and balance the reaction formula for the complete combustion of C13H18O2(ibuprofen). And explain the process step by step. So I get that when it... more
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01/20/21

Which one is a dipole and why? Isomers

These are three isomers of dibromobenzene as follows in the list down belowSo Which molecule or molecules are dipoles and why? How does their structural formula play a role in this? Justification/... more
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01/20/21

Chemical bonding word problem

Somebody help? I’m stuck with this question Warm desert winds sweep into your hotel room in Marrakech. The air conditioning has broken down and you have a very hard time sleeping due to the heat.... more
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01/19/21

Pathophysiology/Cancer Question
Explain the mechanisms whereby chemotherapy and irradiation are able to destroy cancer cells, while having less or no effect on normal cells. Any help with this question would be greatly... more
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01/19/21

Angular Kinematics
Hello, I am struggling in my science class and I'm not sure how to do the unit we are on so I was wondering if someone could give me the answers and how to solve them so I can do better. Thank you!... more
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Science Chemistry

01/19/21

How many grams of aluminum will be needed
How many grams of aluminum will be needed to react to 50g of iron (III) oxide needs to fully react wit the equation FE2O3 + 2AI(S) = AI2O3(S) + 2 Fe (S)
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01/17/21

physics question?
On October 14, 2012, Felix Baumgartner, with a mass of 71 kg, set a record for the highest parachute jump when he jumped from a platform 38,000 m about the surface of the Earth.a) What was Felix’s... more
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01/16/21

physics question
A planet of radius R and density ρ is struck by another planet with a much lower density. With time, the two coalesce into a new planet of radius 3R and a density of ½ ρ. By what factor is the... more
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Science Math Physics

01/15/21

An object with a mass of 3 kg is dropped from the top of a building. Before it strikes the ground, the object’s speed is 11 m/s.
What was its gravitational potential energy (relative to the ground) the instant the object was dropped? Neglect friction.
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01/13/21

Describe the difference between gene and chromosomal mutations, and how mutations in gametes may result in phenotypic changes in offspring.
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Science Math Physics

01/13/21

what is the tangential acceleration of a point on the edge of the pulley?
A pulley with a radius of 7.7 cm has a moment of inertia of 3 kg*m2. If the net torque acting on the pulley is 8 N*m, what is the tangential acceleration of a point on the edge of the pulley?
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01/13/21

Chemistry weak bases
Trimethylamine, (CH3) 3N is a weak base (Kb = 6.3 × 10–5). What volume of this gas, measured at STP, must be dissolved in 2.5 L of solution to give that solution a pOH of 2.50?
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Science Math Physics

01/13/21

what is the angular acceleration of the pulley?
A pulley with a radius of 38 cm has a moment of inertia of 35.5 kg*m2. If the net torque acting on the pulley is 7 N*m, what is the angular acceleration of the pulley?
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01/13/21

What does metabolic profiling study provide that is unique to the metabolomics alone and not to any other ''Omics'' ?
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Science Math Chemistry

01/13/21

The rate of the reaction NO2 + CO → NO + CO2 depends only on the concentration of NO2. The following data were collected:
The rate of the reaction NO2 + CO → NO + CO2 depends only on the concentration of NO2. The following data were collected: Time (s) [NO2]0 (M) 0  0.500 1.20 x 103  0.444 3.00 x... more
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01/12/21

Extraction blanks are essential within metabolomics experiments, which of the following statements are incorrect ?
A.) The extraction blanks are treated the same as the samples and undergo the same extraction procedureB.) The extraction blanks are used to identify artifacts such as plastic or solvent... more
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01/12/21

Which of these is an advantage of in-gel electrophoresis compared to gel-free approaches (choose one answer) ?
A.) Allows the type of protein modification to be identifiedB.) It is more sensitiveC.) Allows a greater range of proteins to be analyzedD.) Intract proteins allow detection of changes in protein... more
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01/12/21

Which of the answer(s) true ?
Which of the following is characteristic of the DNA methylation process ? Select one or ones that apply.A.) S-adenosyl methionine (SAM)B.) Histone acetyl transferases (HATs)C.) Histone deacetylases... more
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Science Math Physics

01/12/21

Two cars are involved in a rear-end collision. A Hummer (m = 2500 kg) is traveling at 20 m/s when it hits a Smart Car (m = 1000 kg) that is stopped at a red light.
Two cars are involved in a rear-end collision. A Hummer (m = 2500 kg) is traveling at 20 m/s when it hits a Smart Car (m = 1000 kg) that is stopped at a red light. If the Hummer comes to rest, how... more
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Science Math Physics

01/12/21

what is the magnitude and direction of the velocity of the baseball after it is hit?
A baseball pitcher throws a 0.25 kg ball at a speed of 50 m/s to the east. If the batter strikes the ball with a force of 175 N to the west for a duration of 0.15 seconds, what is the magnitude and... more
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Science

01/12/21

What is the mass of object on earth if it has 400 N ?
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01/11/21

Angular Kinematics
Hello, I am struggling in my science class and I'm not sure how to do the unit we are on so I was wondering if someone could give me the answers and how to solve them so I can do better. Thank you!... more
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