4,349 Answered Questions for the topic Science

Science Chemistry

11/03/22

What is the Ka?
If the pH of an acid is 2.3 when it has been titrated to 1/2 of the equivalence point, what is its Ka?
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Science Chemistry

11/03/22

Determine the equilibrium constant?
Determine the equilibrium constant for a reaction at 200.0 K if ∆G° =-13.00 kJ/mol. (R = 8.314 J/mol ･ K)
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11/03/22

what is slope intercept for with this equation

the slope is 3/1
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Science Chemistry

11/02/22

What is the solubility?
What is the solubility of Cr(OH)₃ at a pH of 10.00? (Ksp Cr(OH)₃ is 6.70 × 10⁻³¹)
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Science

11/02/22

Which best represents a physical property of a substance?
answer choices areA. Acids act as a corrosive to metalB. Gold has a density of 19.3 g/cm3C. Hydrochloric Acid reacts with Zinc metal, creating hydrogen gasD. Hydrochloric Acid reacts with Zinc... more
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Science Chemistry

11/02/22

What mass of AgBr?
What mass of AgBr will dissolve in 500.0 mL of 5.30 M NH₃? Ksp for AgBr is 5.0 × 10⁻¹³. For the reaction Ag⁺(aq) + 2NH₃(aq) ⇌ Ag(NH₃)₂⁺(aq) K = 1.7 × 10⁷.
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Science Chemistry

11/01/22

What is the minimum mass?
What is the minimum mass of Mg(NO₃)₂ that must be added to 1.00 L of a 0.210 M HF solution to begin precipitation of MgF₂(s)? For MgF₂, Ksp = 7.4 × 10⁻⁹, and Ka for HF = 7.2 × 10⁻⁴.
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11/01/22

Reliability of Information on the Web.
Instructions: The internet offers endless opportunities to obtain high-quality information on a wide variety of topics that are relevant to nutrition, but it also delivers an abundance of... more
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10/31/22

Reliability of Information on the Web.
 Instructions: The internet offers endless opportunities to obtain high-quality information on a wide variety of topics that are relevant to nutrition, but it also delivers an abundance... more
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Science Chemistry

10/31/22

Calculate the pKa of lactic acid
Calculate the pKa of lactic acid (CH3CH(OH)COOH) given the following information.40.0 mL of 0.2 M KOH are added to 100. mL of a 0.500 M lactic acid solution producing a pH of 3.134.
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Science Chemistry

10/31/22

What is the minimum concentration?
An aqueous solution at room temperature is 0.25 M in both Ba²⁺ and Ca²⁺ ions. You want to separate these two ions by selective precipitation using carbonate. What is the minimum concentration of... more
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Science Chemistry

10/31/22

What is the equilibrium concentration?
350. mL of 3.2 M Pb(NO₃)₂ and 200. mL of 0.020 M NaCl are added together. The Ksp for lead(II) chloride is 1.6 x 10⁻⁵. What is the equilibrium concentration of the chloride ion when all PbCl₂(s)... more
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Science Chemistry

10/31/22

What is the pH?
What is the pH of a saturated solution of Zn(OH)₂? (Ksp for Zn(OH)₂ = 3.0 × 10⁻¹⁶).
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Science Chemistry

10/31/22

What is the solubility?
What is the solubility of PbF₂ in a solution that contains 0.0850 M Pb²⁺ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸)
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10/31/22

Hello is this a good conclusion for a concept paper?
In conclusion, Pplants with fibrous roots aid different kinds of soil in controlling soil erosion, which is caused by changes in temperature, weather (amount of precipitation), and human activities... more
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10/31/22

Hello is this a good introduction for a concept paper?
Hello is this a good introduction for a concept paper? What can I add to make it good?The geographic landscape of the Philippines generates soil erosion incidents— such as flooding and landslide—... more
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10/31/22

Hello is this a good introduction for a concept paper?
Hello is this a good introduction for a concept paper? What can I add to make it good?We thrive on performance, competitiveness, and perfection in today's world, which causes stress to rise subtly,... more
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10/31/22

What are the chemicals present in essential oils that can help relieve stress or human health?
What are the chemicals present in essential oils that can help relieve stress or human health?
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Science Chemistry

10/31/22

Help me please!
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.   ­­2NaClO3­ --> 2NaCl +3O2  How many grams of NaClO3­ were needed to produce 6 grams of O2? Round... more
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Science English

10/31/22

CAN SOMEONE MAKE A POEM ON FORCES AND MOTION WITH THESE WORDS PLEASE?

Force Exert Velocity Collision Cause Effect Friction Infer
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Science Biology

10/29/22

What determines the frequency of a particular (and genetically determined) phenotype in a given population? Select all the answers that apply.
  A) The frequency of the alleles controlling that phenotype.  B) Selection in favour or against the phenotype in question.  C) Migrations in and out of the population.  D) Whether individuals mate... more
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Science Chemistry

10/26/22

What is the solubility?
What is the solubility of La(IO₃)₃ in a solution that contains 0.400 M IO₃⁻ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
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10/26/22

I have no idea how to solve this
Good evening everyone. I'm struggling with this task for my anatomy & physiology assignment, what i have to do is to transcribe the following DNA sequence into mRNA:  GGTCAATGCCATAAG , and... more
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10/25/22

Find the magnitude and direction of the acceleration of a 500 kg elevator supported by a cable with a tension of 3000 N.
Solve a numerical "elevator problem" for the tension of an elevator cable or the acceleration of an elevator.
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10/25/22

A 3 kg object is sliding to the left on a surface with a coefficient of friction of 0.2 at an initial velocity of 15 m/s. Determine the magnitude and direction of the acceleration of this object.
Calculate the acceleration of an object sliding on a flat rough surface (meaning there is friction).
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