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
Dahasolnce [82]
3 years ago
7

What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of.

Chemistry
1 answer:
Citrus2011 [14]3 years ago
4 0

Answer:

I think u understand this answers

You might be interested in
During electrophilic aromatic substitution, a resonance-stabilized cation intermediate is formed. Groups, already present on the
DIA [1.3K]

Answer:

See explanation and image attached

Explanation:

Aromatic compounds undergo electrophilic aromatic substitution reactions in which the aromatic ring is maintained.

Substituted benzenes may be more or less reactive towards electrophilic aromatic substitution than benzene depending on the nature of the substituent present in the ring.

Substituents that activate the ring towards electrophilic substitution such as -OCH3 are ortho-para directing.

The major products of the bromination of anisole are p-bromoanisole and o-bromoanisole. The resonance structures leading to these products are shown in the image attached.

5 0
3 years ago
An unsaturated aqueous solution of NH3 is at 90.°C in 100. grams of water. According to Reference Table G, how many grams of NH3
Illusion [34]
The answer will be 2. 10.g
Hope it's help you
3 0
3 years ago
How many grams in 10 ounces
Kamila [148]

Answer:

283.495g

Explanation:

8 0
3 years ago
Read 2 more answers
Is the cell thoeory a law
Sunny_sXe [5.5K]
No, It's not a law.                                                                 
4 0
3 years ago
Calculate the mass % of K in potassium phosphate
Blizzard [7]

Answer:

\large \boxed{\mathbf{1. \, \,55.26 \, \%; \, \,2. \, \,30.15 \, \%  }}

Explanation:

1. Mass percent of K

\begin{array}{cccr}\mathbf{Atoms} & \textbf{Contribution} &   & \textbf{Subtotal}\\\text{3K} & 3 \times 39.10 & = & 117.30\\\text{1P} & 1 \times 30.97 & = & 30.97\\\text{4O} & 4 \times 16.00 & = &64.00\\& \text{TOTAL} & = & \mathbf{212.27}\\\end{array}

\text{Percent K} =  \dfrac{\text{117.30 g}}{\text{212.27 g}} \times \, 100\% =  \mathbf{55.26 \, \%}\\\text{The percent by mass of potassium is $\large \boxed{\mathbf{55.26 \, \% }}$}

2. Mass percent of O

\text{Percent O} =  \dfrac{\text{64.00 g}}{\text{212.27 g}} \times \, 100\% =  \mathbf{30.15 \, \%}\\\text{The percent by mass of oxygen is $\large \boxed{\mathbf{30.15 \, \% }}$}

6 0
3 years ago
Other questions:
  • Technetium (Tc; Z = 43) is a synthetic element used as a radioactive tracer in medical studies. A Tc atom emits a beta particle
    7·1 answer
  • What concept explains why some objects heat up faster than others when exposed to the same heat source?
    8·1 answer
  • Half-reactions can be written to represent all
    10·2 answers
  • If you burn 55.6 g of hydrogen and produce 497 g of water, how much oxygen reacted?
    10·2 answers
  • ..can someone answer these questions ive already posted this question 16 times and I dont have much points left so please anyone
    14·2 answers
  • Can someone help me ASAP THIS IS IS A IMPORTANT GRADE
    10·2 answers
  • Which energy resource produces the least amount of air pollution?
    6·1 answer
  • How many moles are in 2.3x1024 g of Ag?<br> Plz help!!
    8·1 answer
  • Robert Boyle and Robert Hooke worked together and discovered some important physics concepts. Their work lead to the formation o
    9·2 answers
  • 7. How many moles of mercury(ii) oxide, hgo, are needed to produce 12. 5 g of oxygen, o2? 2 hgo(s) ---&gt;2 hg(l) o2(g)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!