1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Juli2301 [7.4K]
2 years ago
13

There are seven types of crystals. Which of these is not one of the seven?

Chemistry
2 answers:
kondor19780726 [428]2 years ago
4 0

Answer:

B- Tetraclinic

Explanation:

According to the similarity of their symmetry elements, thirty-two classes are grouped into seven crystal systems: isometric (cubic) system, tetragonal system, hexagonal system, trigonal system (subdivision of the hexagonal system, second North American school of crystallography). , called rhombohedral hexagonal system), orthorhombic system, monoclinic system and triclinic system. Applying the symmetry operations on all possible reticular planes (potential crystal faces) in the seven crystalline systems, according to the 32 symmetry classes, only 48 geometric shapes are possible to be obtained.

Gelneren [198K]2 years ago
3 0
The answer is B. tetraclinic
You might be interested in
Draw structural formulas for the alkoxide ion and the alkyl(aryl)bromide that may be used in a williamson synthesis of the ether
Juliette [100K]
Williamson synthesis is the most common way for obtaining ethers, called after its developer Alexander Williamson. It is an organic reaction of forming ethers from an organohalide and an alkoxide. The reaction is carried out according to the SN2 mechanism.

On the attached picture it is shown required alkoxide ion, <span>alkyl(aryl)bromide and the ether that forms from the reactants. </span>

3 0
3 years ago
Consider the data presented below. time (s) 0 40 80 120 160 moles of a 0.100 0.067 0.045 0.030 0.020 part a part complete determ
Whitepunk [10]
To determine which order of the reaction it is, first we need to calculate the rate of change of moles.
the data is as follows 
time         0         40        80       120       160
moles    0.100   0.067  0.045    0.030    0.020


Q1)
for the first 40 s change of moles ;
      = -d[A] / t
      = - (0.067-0.100)/40s
      = 8.25 x 10⁻⁴ mol/s
for the next 40 s
      = -(0.045-0.067)/40
      = 5.5 x 10⁻⁴ mol/s
the 40 s after that
      = -(0.030-0.045)/40 s 
     = 3.75 x 10⁻⁴ mol/s
k - rate constant
and A is the only reactant that affects the rate of the reaction

rate = k [A]ᵇ
8.25 × 10⁻⁴ mol/s = k [0.100 mol]ᵇ ----1
5.5 x 10⁻⁴ mol/s = k [0.067 mol]ᵇ   -----2
divide the 2nd equation by the 1st equation
1.5 = [1.49]ᵇ
b is almost equal to 1
Therefore this is a first order reaction

Q2)
to find out the rate constant(k), we have to first state the equation for a first order reaction.
rate = k[A]ᵇ
As A is the only reactant thats considered for the rate equation. 
Since this is a first order reaction,
b = 1
therefore the reaction is 
rate = k[A]
substituting the values,
8.25 x 10⁻⁴ mol/s = k [0.100 mol]
k = 8.25 x 10⁻⁴ mol/s /0.100mol
   = 8.25 x 10⁻³ s⁻¹

7 0
3 years ago
___ Au₂S₃ + ___ H₂ → ___ Au + ___ H₂S
Natalija [7]

Answer:

2Au₂S₃ +  6H₂ → 4Au + 6H₂S

Explanation:

Balancing:

2Au₂S₃ +  6H₂ → 4Au + 6H₂S

6 0
3 years ago
A group of birds eat fruit from a tree. The fruit falls to the ground where
olchik [2.2K]

Answer:

Both answer choice 2 and answer choice 3 are correct choices.

Explanation:

Biotic factors are living components in an ecosystem. They are living organisms which affect another living component in an ecosystem.

Antibiotic factors are non living components of an ecosystem. They are chemicals which affect living organisms.

The choice 2 is correct. The seeds spread out by mice is a biotic factor interacting with an antibiotic factor

Choice 3 is correct. The seeds in the soil grow into new trees are biotic factors interacting with an antibiotic factor

3 0
3 years ago
Which of the following depicts a molecule of DNA? A, B, C, D?
Ghella [55]

Answer:

D. I've watched Jurassic park uwu

7 0
2 years ago
Other questions:
  • The reaction between potassium chlorate and red phosphorus takes place when you strike a match on a matchbox. if you were to rea
    5·1 answer
  • When a liquid is poured from a tall narrow cylinder into a short, wide beaker, _____.
    15·2 answers
  • The hormone adrenaline can affect only cells with
    11·1 answer
  • To neutralized 1.65g LiOH, how much .150M HCl would be needed?
    12·1 answer
  • many cars have gas filled shock absorbers to give the car and it’s occupants a smooth ride. if a four passenger is loaded with f
    14·1 answer
  • Hydrogen atoms and helium atoms are not the same.<br> True<br> False
    9·2 answers
  • An unknown organic compound composed of carbon, hydrogen, and oxygen was analyzed and found to be 50.84% C, 8.53% H, and the res
    10·1 answer
  • How can you tell that the solution contains a weak acid?
    7·1 answer
  • During a hurricane, what effect can the ocean have on the beach?
    12·1 answer
  • A 45ml of a 4M solution of CaBr2 contains how many grams of CaBr2?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!