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Dahasolnce [82]
3 years ago
13

At the end of the school day, the teacher gives each student a compass. She explains that a compass is made of a small piece of

metal called a needle. She also told students that the Earth has a magnetic force around it. She asked students to use what they've learned about electric and magnetic forces to explain why a compass always points north.
Which of the following is the best explanation of why a compass points north?
A.The needle of the compass is likely pulled towards the north because the needle and north area of the Earth are both positively charged, causing an attraction.
B.Since the Earth has a magnetic force, it must attract one end of the needle. The needle likely has an electric force that is affected by the magnetic force of the Earth.
C.Since the Earth has a magnetic force, it must attract one end of the needle. The needle is likely magnetic and has opposite charges on each end
.D.The Earth's magnetic force causes metals, like the needle of a compass, to point north because of the electric force in the needle. They likely repel each other.
Chemistry
2 answers:
Alex73 [517]3 years ago
4 0

Answer:

i dont know but thanks for the free points

Explanation:

Dmitry_Shevchenko [17]3 years ago
3 0

Answer: hmmm I think the answer would be C?

Explanation:Tell me if I'm right or wrong sorry if its wrong I don't really understand just trying!

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Pachacha [2.7K]
<span>The student should follow following steps to make 1 L of </span>2.0 M CaCl₂.<span>
<span>
1. First he should calculate the number of moles of 2.0 M CaCl</span></span>₂ in 1 L solution.<span>

</span>Molarity of the solution = 2.0 M<span>
Volume of solution which should be prepared = 1 L

Molarity = number of moles / volume of the solution

Hence, number of moles in 1 L = 2 mol

2. Find out the mass of dry CaCl</span>₂ in 2 moles.<span>

moles = mass / molar mass

Moles of CaCl₂ = 2 mol</span><span>
Molar mass of CaCl₂ = </span><span>110.98 g/mol

Hence, mass of CaCl</span>₂ = 2 mol x <span>110.98 g/mol
                                     = 221.96 g

3. Weigh the mass accurately 

4. Then take a cleaned and dry1 L volumetric flask and place a funnel top of it. Then carefully add the salt into the volumetric flask and finally wash the funnel and watch glass with de-ionized water. That water also should be added into the volumetric flask.

5. Then add some de-ionized water into the volumetric flask and swirl well until all salt are dissolved.

<span>6. Then top up to mark of the volumetric flask carefully. 
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7. As the final step prepared solution should be labelled.
4 0
2 years ago
How many sigma bonds does NBr3 have?
Kisachek [45]

Answer:

It has 3 sigma bonds

Explanation:

A sigma bond is a covalent interaction between two atoms, these bonds are the strongest type of covalent bonds and they are formed by the overlap of atomic orbitals.

The nitrogen is bond to the bromine atoms through sigma bonds, which means that exist 3 sigma bonds in the molecule.

this molecule has a trigonal pyramid geometry due to the free pair of nitrogen electrons.

5 0
3 years ago
Brainliest grind of 2014i-
aksik [14]

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IM just too pogchamp

Explanation:

5 0
2 years ago
Predict which substance has greater molar entropy. Explain.(b) KClO3₃(s) or KClO₃(aq)
photoshop1234 [79]

KClO3 (aq) will have greater molar entropy than KClO3 (s) because molar entropy increases with increase in temperature.

As the temperature rises, the standard molar entropy of any substance rises. Entropy and a Single Substance's Temperature ” Entropy increases significantly when a solid turns into a liquid and when a liquid turns into a gas. The entropy of the liquid is lower than that of the gas. As a result, entropy rises in reactions that produce gaseous byproducts from solid or liquid reactants. When solid reactants produce liquid products, entropy also rises.

Learn more about Molar entropy here-

brainly.com/question/3627396

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5 0
1 year ago
Which of the following would describe a spontaneous process? (Select all that apply.) ΔGreaction &lt; 0 ΔSuniverse &lt; 0 ΔSuniv
Ganezh [65]

Answer:

ΔGreaction < 0

ΔSuniverse > 0

ΔHreaction < 0

Explanation:

A spontaneous process is one which can proceed without additional input of energy releasing free energy in the process and then moves to a lower more stable thermodynamical state.

For an isolated system, a spontaneous process proceeds with an increase in entropy.

The conditions for a spontaneous process at constant temperature and pressure, can be determined using the change in Gibbs free energy, which is given by: ∆G = ∆H - T∆S

Where ∆G is change in free energy; ∆H is change in enthalpy or Heat content; ∆S is change in entropy, T is temperature.

For a process to be spontaneous, the following conditions are necessary:

1. ∆G < 0; must be negative

2. ∆S > 0; there must be an increase in entropy

3. ∆H < 0; enthalpy change must be negative such that heat is lost to the surroundings

The above conditions ensures that ∆G is negative and the process is spontaneous.

8 0
2 years ago
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