CHEMISTRY HIGH SCHOOL

Which layer spins creating Earth’s magnetic feild

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Answer 1
Answer:

The Outer Core

Explanation: Deep inside the planet, in a region known as the outer core, the magnetic field of the planet is created.

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Observation and experimentation have led many scientists to accept a theory about the origin of the universe, called The Big Bang Theory. Briefly describe one piece of evidence that supports this scientific theory. (4 points)
Which statement is true? A molecule having a covalent bond can be ionic. A molecule having a covalent bond is always polar. A molecule having a covalent bond may be polar or nonpolar. A molecule having a covalent bond is always nonpolar.

What is the pH of a 2.0 M solution of HClO4?

Answers

HClO4 is a strong acid. Strong acids dissociate completely in water. 2.0 M of HClO4 is equal to 2.0 M of the H+ ion component of the substance. To solve the pH, the ff formula is to be used: 
pH=-log[H+]

Is an isotope more or less stable the longer the half life?

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Answer Can someone here please look at my questions and see if you can help

1.09 L of a gas at standard temperature and pressure is compressed to 374 ml. what is the new pressure of the gas?

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This can be solved using the equation PV = nRT, but there is an easier way using Boyle's Law. This law states that the product of pressure and volume are constant in a system with constant temperature. This means that we can set the product of initial pressure and volume equal to the final pressure and volume. Maybe you have seen this equation as P1V1 = P2V2.  We know that temperature is constant at 0 degrees Celsius (or 273.15 K), and that the initial pressure is standard at 1 atmosphere (atm). This means our knowns are:
P1 = 1 atm    V1 = 1.09 L    V2 = 0.374 L (from 374 mL)
Plug these into the Boyle's Law equation P1V1 = P2V2:
(1 atm)*(1.09 L) = (P2) * (0.374 L)
(1 atm)*(1.09 L)/(0.374 L) = P2
P2 = 2.91 atm

What physical property of an element determines whether it acquires a positive or negative partial charge when participating in a polar covalent bond?

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nature of atoms and molecules, focusing on the structure of the atom and how it was discovered. We next explore the various ways that atoms combine with other atoms to create molecules, looking at the different types of chemical bonds between atoms, how these bonds form , and how they determine the structures of molecules. We end with an examination of the water molecule and the properties that make it a crucial component of living organisms and their environment.

Increasing temperature increases the number of collisions and the potential energy of the colliding molecules anddecreases the reaction rate.
True or False PLZ HELP!!

Answers

Increasing temperature does increase the amount of collision but it increases the kinetic energy of the molecules not the potential energy. Potential energy brings molecules together or apart (depending) and kinetic energy makes the molecules move around or not. Hope this helps

Write these numbers rounded to the three nearest significant figures

Answers

Answer:

(a) 52.2 mL helium

(b) 18.0 g nitrogen

(c) 78.5 mg MSG

(d) 23,600,000 mm wavelength

(e) 0.00420 kg lead

Rounded the numbers to three nearest significant figures.
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