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labwork [276]
2 years ago
9

Monica wrote the following observations about stars: "I observed a pattern of five stars at 8:00 p.m. and again at 9:00 p.m. The

pattern was in the exact same position both times. When I checked the same location again at 10:00 p.m., the pattern of five stars was not there." Choose the statement which corrects the error in Monica's observation.(2 points)
A.At 9:00 p.m., Monica would not be able to see the stars in the sky.
B.At 9:00 p.m., the pattern has moved to a different position in the sky.
C.At 10:00 p.m., only four of the five stars would be visible in the sky.
D.At 10:00 p.m., the pattern has moved to a different position in the sky.
Chemistry
2 answers:
stiv31 [10]2 years ago
8 0
The answer would be b
Mama L [17]2 years ago
6 0
I think it is C. Hope this helps
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Explanation:

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How many covalent bonds does nitrogen form if each of its unpaired electrons participate in one bond?
nirvana33 [79]

Nitrogen could form 3 covalent bonds if each of its unpaired electrons participates in one bond.

Nitrogen atom forms 3 bonds based on octet rule, because it has 5 valence electrons. That means it needs 3 bonds or three more electrons.

<h3>Further Explanation;</h3><h3>Chemical bond  </h3>
  • A bond is a type of force that is formed between atoms of different through the sharing or transfer of electrons.
<h3>Octet rule</h3>
  • According to the octet rule for an atom to be stable it must have maximum number of electrons in its outermost energy level. Therefore an atom with four electrons requires four more electrons to attain stability.
<h3>Types of chemical bonds.</h3><h3>Covalent bond  </h3>
  • This is a type of bond that is formed between non-metal atoms. It is formed as a result of sharing electrons between non-metal atoms involved.
  • When atoms involved contribute equal number of electrons to the bond formation, the type of bond is known as covalent bond
  • A covalent bond may be a dative covalent bond, when the shared electrons come from one atom.
<h3>Ionic bond  </h3>
  • This is a type of bond that occurs between metal ions and non-metal ions. Ionic bond occurs as a result of transfer of electrons from one metal atom to another non-metal atom.
  • After the transfer of electrons, metal atom loses electron to form a cation while the non-metal atom gains electrons to form an anion.
<h3>Other types of chemical bonds include;</h3>
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Keywords: Chemical bond, covalent bond, atom  

<h3>Learn more about:</h3>
  • Chemical bonds:brainly.com/question/5274289
  • Ionic bonds: brainly.com/question/5274289
  • Covalent bonds: brainly.com/question/5274289

Level: High school  

Subject: Chemistry  

Topic: structure and bonding  

Sub-topic: Covalent bond

3 0
3 years ago
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Coffee is a solution of organic substances in water
Eduardwww [97]

Answer:

yes it is

Explanation:

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3 years ago
An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron? A. 450.00
valkas [14]

Answer:

  • <u>Option A. 450.00</u>

Explanation:

<u>1) Data:</u>

a) m = 18 kg

b) T₁ = 285 K

c) T₂ = 318 K

d) Q = 267.3 kJ

e) S = ?

<u>2) Principles and equations</u>

The specific heat of a substance is the amount of heat energy absorbed to increase the temperature of certain amount (gram, kg, or moles, depending on the definition or units) of the substance in 1 ° C or 1 K.

The mathematical relation between the specific heat and the heat energy absorbed is:

  • Q = m × S × ΔT

Where,

  • Q is the heat absorbed,
  • S is the specific heat, and
  • ΔT is the temperature increase (T₂ - T₁)

<u>3) Solution:</u>

<u>a) Substitute the data into the equation:</u>

  • 267.3 kJ = 18 kg × S × (318 K - 285 K)

<u>b) Solve for S and compute:</u>

  • S = 267.3 kJ / (18 kg × 33 K) = 0.45 kJ / (Kg . K)

The options have not units, but I notice that the first answer is 1,000 times the answer I obtained, so I will make a conversion of units.

<u>c) Convert to J /( kg . k):</u>

  • 0.45 kJ / (Kg . K) × 1,000 J / kJ = 450 J / (kg . K)

Now we can see that the option A is is the answer, assuming the units.

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Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid
kozerog [31]

Answer:

solubility

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<em>hope it helps :)</em>

<em>please mark it the brainliest!</em>

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