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Tanya [424]
2 years ago
8

Cho hai điện tích q1 = 2.10-6 C, q2 = 4. 10-6C, đặt tại A và B trong không khí biết AB = 2 cm. Xác định vectơ cường độ điện trườ

ng tại:
a) H, là trung điểm của AB.
b) . M, MA = 1 cm, MB = 3 cm.
c) N, biết rằng NAB là một tam giác đều.
Chemistry
1 answer:
Nitella [24]2 years ago
6 0

Answer:

<h3>A</h3>

Explanation:

<h2>sorry try lang baka mali</h2><h2 />
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Al + 02 --&gt; Al 2 0 3
nata0808 [166]

The coefficient for aluminium is 4.

Explanation:

We have the following chemical reaction:

Al + O₂ → Al₂O₃

In order to balance the chemical equation the number of the atoms entering the reaction should be equal to the number of atoms leaving the reaction.

2 Al + 3/2 O₂ → Al₂O₃

However we need integer numbers so we multiply everything with 2.

4 Al + 3 O₂ → 2 Al₂O₃

The coefficient for aluminium is 4.

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5 0
3 years ago
The forces between water molecules are stronger than the forces between ethanol molecules. Which liquid would probably be most d
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4 0
3 years ago
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Water vapor particles are most likely to phase change into liquid particles if the vapor particles come into contact with
dalvyx [7]
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For a liquid to change to gas, it has to absorb enough energy to break the chemical bond that is holding the liquid particles together. When a liquid change to gas it is called vaporization. When a vapour, for instance water vapour comes in contact with cooler surfaces they lose energy and get converted back to the liquid state; this process is called condensation.
8 0
3 years ago
Convert 7.1X1025 molecules of water to moles
scoundrel [369]

Answer:

Moles of water in 7.1×10²⁵ molecules are 118 mol.

Explanation:

Given data:

Number of molecules of water = 7.1×10²⁵ molecules

Moles of water in 7.1×10²⁵ molecules = ?

Solution;

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ molecules of water

7.1×10²⁵ molecules of water × 1 mol / 6.022 × 10²³ molecules of water

1.18×10² moles of water 0r 118 moles of water

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2 years ago
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Firlakuza [10]

Answer:

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Explanation:

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