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
mixer [17]
3 years ago
13

*PLEASE HELP!*

Chemistry
2 answers:
horsena [70]3 years ago
8 0
For number one the answer is A
babymother [125]3 years ago
4 0

Answer:

1)<em>P</em><em>2</em><em>O</em><em>5</em>

Explanation:

2)<em>B</em>

<em>3</em><em>)</em><em>2</em><em>2</em><em>.</em><em>4</em><em>L</em>

4)<em>9</em><em>0</em><em>.</em><em>5</em>

5)<em>2</em><em>.</em><em>9</em><em>g</em>

You might be interested in
Which of the following was most likely NOT present in creating the amino acids of early Earth's water of the past? A. ammonia B.
Igoryamba
B or D but id say go with D

7 0
3 years ago
Read 2 more answers
Classify each of the following as abiotic or biotic.
mars1129 [50]

Answer:

<h3>D. </h3>

Explanation:

<h3>#I'm not sure</h3><h3>#happy learning</h3>
7 0
3 years ago
Read 2 more answers
51. The radius of gold is 144 pm and the density is 19.32 g/cm3. Does elemental gold have a face-centered cubic structure or a b
Serjik [45]

Answer:

Elemental gold to have a Face-centered cubic structure.

Explanation:

From the information given:

Radius of gold = 144 pm

Its density = 19.32 g/cm³

Assuming the structure is a face-centered cubic structure, we can determine the density of the crystal by using the following:

a = \sqrt{8} r

a = \sqrt{8} \times 144 pm

a = 407 pm

In a unit cell, Volume (V) = a³

V = (407 pm)³

V = 6.74 × 10⁷ pm³

V = 6.74 × 10⁻²³ cm³

Recall that:

Net no. of an atom in an FCC unit cell = 4

Thus;

density = \dfrac{mass}{volume}

density = \dfrac{ 4 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{6.74 \times 10^{-23} \ cm^3}

density d = 19.41 g/cm³

Similarly; For a  body-centered cubic structure

r = \dfrac{\sqrt{3}}{4}a

where;

r = 144

144 = \dfrac{\sqrt{3}}{4}a

a = \dfrac{144 \times 4}{\sqrt{3}}

a = 332.56 pm

In a unit cell, Volume V = a³

V = (332.56 pm)³

V = 3.68 × 10⁷ pm³

V  3.68 × 10⁻²³   cm³

Recall that:

Net no. of atoms in BCC cell = 2

∴

density = \dfrac{mass}{volume}

density = \dfrac{ 2 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{3.68 \times 10^{-23} \ cm^3}

density =17.78 g/cm³

From the two calculate densities, we will realize that the density in the face-centered cubic structure is closer to the given density.

This makes the elemental gold to have a Face-centered cubic structure.

3 0
3 years ago
Help on question 1b please? (image attached)
aliya0001 [1]
I believe your answer Is C. An ammonia molecule has a trigonometrical pyramidal shape. Figure C has a <span>has a trigonometrical pyramidal shape.</span>

I hope I help
3 0
3 years ago
The physical world around us behaves as it does partly because it’s made of a huge number of tiny molecules, each behaving rando
eduard
1. Weird things like the one described above do not happen on a ramdom basis becuause molecules usually move within any enclosure in a ramdom manner. Thus, it is not possible for some types of particles to aggregate in one point while other types of molecule aggreagate in another point. Based on the kinetic energy that is available for each particle, each particle will move random
through the available space, colliding with one another and with the wall of container.

2. It will be a difficult thing to live in a Maxwell' demon world because, things will happen unpredictably and one will never know what to expect next because anything can happen at anytime. For instance, if one is drinking a glass of water, some of the particles of the water may just decide to aggregate to one part of the cup and start boiling. So, for someone who is taking a glass of water, the water may start boiling right inside his mouth when he is drinking, that will be a bad experience. When one is driving a car, the petrol particles may just decide to freeze up when one is busy speeding on the highway; that can cause a very serious accident. Thus, a world where the Maxwell law operates will be a chaotic world.
3 0
4 years ago
Other questions:
  • What may be expected when K &gt; 1.0?
    7·2 answers
  • How was hubble important to our understanding of galaxies
    8·1 answer
  • What is produced during all combustion reactions?
    9·2 answers
  • How many kJ of energy will be released when 4.72g of carbon react with excess oxygen to produce carbon dioxide (delta H is -393.
    6·1 answer
  • An atom of 135I has a mass of 134.910023 amu. Calculate the binding energy in MeV per atom. Enter your answer with 4 significant
    7·1 answer
  • 1. What is the name of the covalent compound CCl4?2. What is the name of the covalent compound N2O5?
    10·2 answers
  • Why displacemet reaction are useful
    11·1 answer
  • Which is true of an element?
    6·2 answers
  • Plz help me I Am timed plz
    12·1 answer
  • ( QUESTION) Physical properties are-
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!