4,347 Answered Questions for the topic Science

Science Chemistry

10/12/22

What is Kb of this base?
An unknown weak base with a concentration of 0.170 M has a pH of 9.56. What is the Kb of this base?
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Science Chemistry

10/12/22

What is the [OH⁻]

What is the [OH⁻] of a 1.90 M solution of pyridine (C₅H₅N, Kb = 1.70 × 10⁻⁹)?
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Science Chemistry

10/10/22

What is the pH?
What is the pH of a 0.0870 M solution of methylamine (CH₃NH₂, Kb = 4.4 × 10⁻⁴)?
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Science Chemistry

10/10/22

What is the pH?
What is the pH of a 0.0580 M solution of hydrocyanic acid, HCN (Ka = 4.9 × 10⁻¹⁰)?
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10/09/22

what newton's law is periodic motion and oscillatory motion?
what newton's law is periodic motion and oscillatory motion?
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Science Math Physics

10/06/22

the question couldn't fit so it's down below
The dome of an electrostatic generator is spherical conductor of radius 13cm. It is initially charged so that the electric potential at the surface is 4.5kV. A smaller isolated sphere of radius 5.2... more
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10/06/22

What volume of O2 at 1.86 106Pa and 375 K is required to completely react with 1.78 L of H2 at the same temperature and pressure to produce H2O? How many O2 and H2 molecules have reacted?
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Science Chemistry

10/05/22

Calculate the ∆G
Consider the reaction: ICl(g) + Cl₂(g) → ICl₃(s). The ∆G° of the reaction is -17.09 kJ/mol. Calculate the ∆G, in kJ/mol, for the reaction at 298 K if the partial pressure of ICl(g) is 0.0400 atm... more
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Science

10/04/22

In a chemical reaction, hydrogen gas reacts with oxygen gas to form carbon dioxide and water molecules, producing heat. What kind of chemical reaction is this, and why?
In a chemical reaction, hydrogen gas (H2) reacts with oxygen gas (O2) to form carbon dioxide (CO2 molecules) and water molecules (H2O), producing heat.What kind of chemical reaction is this, and why?
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Science Astronomy

10/04/22

How would we be able to stop or keep a black hole in a specific place?
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Science Chemistry

10/04/22

Determine the Mass
Determine the mass (in units of grams) of a nonvolatile, nonionizing compound that must be added to 4.79 kg of water to lower the freezing point to -1.3°C if the molar mass of the compound is 50.0... more
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10/04/22

Aspects of Scientific Models
1.What are the key components represented in the model shown in Figure 2?2.What relationships are shown in the Figure 2 model?3.How does the Figure 2 model connect to phenomena?4.Do you think the... more
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10/01/22

What is the balanced equation of the chemical reactions involved in making toothpaste?
Like for example the balanced chemical equation for the synthesis of Urea is: 2NH3 (aq) + CO2 (aq) à CH4N2O (aq) + H2O (l)
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Science Chemistry Physics

10/01/22

CHEMISTRY Question

 In a space shuttle, the CO2 that the crew exhales is removed from the air by a reaction within canisters of lithium hydroxide. Let's assume that one astronaut exhales about 825.  L of CO2 daily.... more
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10/01/22

i lost 3/4 of a pound per day for 6 weeks
if during one leg of my coma marathon (feb-march 2020) I was bedridden (so not burning calories exercising) and well hydrated, calorie/nutritional intake was maybe 4-8 hundred/day in nutritional... more
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Science Chemistry

09/30/22

An electron in the n = 6 level emits a photon with a wavelength of 410.2 nm. To what energy level does the electron move?
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Science Chemistry

09/29/22

An electron in a hydrogen atom in the level n = 5 undergoes a transition to level n = 2. What does the Bohr model of the atom predict for the frequency of the emitted radiation?
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09/28/22

Help me please i dont even know where to start
Activity 2Record time at various positions below in Activity 2, Table 1 per the details in Activity 2 laboratory exercise instructions. Graph the points from Activity 2 Table 1 and draw a line of... more
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09/28/22

A car enters a highway at a speed of 5.8 meters/second and accelerates uniformly to 65 meters in 7.2 seconds. What is the speed of the car after this?
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09/27/22

The shuttle lands on the runway at a speed of 105 meters/second. It then decelerates by parachute and comes to a complete stop in 60 seconds.
Assuming constant acceleration, calculate the distance required for the shuttle to come to a complete stop.
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Science

09/27/22

Matter with atoms in a fixed position in relation to one another is in the liquid state.
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Science Chemistry Physics

09/27/22

Chemistry Question
Ethanol, C2H5OH, is considered clean fuel because it burns in oxygen to produce carbon dioxide and water with few trace pollutants. If 500.0 g of H2O are produced during the combustion of ethanol,... more
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Science

09/26/22

A car is traveling at a steady speed of 75 m/s and its velocity changes to 95 m/s in 10 s. What is its acceleration?
A car is traveling at a steady speed of 75 m/s and its velocity changes to 95 m/s in 10 s. What is its acceleration?
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09/24/22

Help needed with physics problem
A 2.5-cm-diameter parallel-plate capacitor has a 2.1 mm spacing. The electric field strength inside the capacitor is 1.0×10^5 V/m .How much charge is on each plate?My answers were: 6.0*10^-8... more
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Science Biology

09/24/22

What 5 enzymes are found in grapes? What does each of them do?
I learned that enzymes play a big role in winemaking. But most of the enzymes I've read about are from the same families, Pectinase and Glycosidases which almost serve the same purpose.
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