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
Aliun [14]
3 years ago
9

A graph of coal reserves in the United States versus time slopes downward.

Chemistry
2 answers:
Dafna1 [17]3 years ago
4 0

Answer:

increased

Explanation:

I believe to be increased ,because the coal is a natural resource to be used.

i really hope it helps

tatyana61 [14]3 years ago
3 0
I remember I had this question before on USA test prep and it’s increased
You might be interested in
Which equation correctly relates the heat of reaction to the standard heats of formation?
VARVARA [1.3K]

Answer:

D

Explanation:

∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)

4 0
3 years ago
What is N? (Needed electrons)
lianna [129]
Do you know what is meant by needed? does it mean lone pairs?
8 0
3 years ago
Match each element to the number of electrons in its valence shell
blondinia [14]

Answer: Be= 2, C =4,  Li = 1 and  B=3

Explanation:

The valence shell can be define as the outermost shell of an atom that contains the valence electrons.

Beryllium (Be), electronic configuration; 1s2 2s2, = 2 electrons in its valence shell.

Carbon (C), electronic configuration; 1s2 2s2 2p2, = 4 electrons in its valence shell.

Lithium (Li), electronic configuration; 1s2 2s1 = 1 electron in its valence shell.

Boron (B) , electronic configuration; 1s2 2s2 2p1 = 3 electron in its valence shell.

6 0
3 years ago
cyclohexanol is burned as a fuel, according to the following equation, how many moles of oxygen are needed to produce 13.7 mol o
lidiya [134]

 The moles  of oxygen  that are needed  to produce 13.7 moles  of  carbon  dioxide  is  21.17  moles  of Oxygen


<u><em>calculation</em></u>

2 C₆H₁₂O  + 17 O₂ → 12 CO₂  +12 H₂O


The moles of O₂  is determined using the mole ratio

that  is for  given equation above   O₂ : Co₂  is 17 :12

therefore the moles of O ₂= 13.7   moles x 17/12 =21.17  moles

3 0
2 years ago
Minerals are _________ inorganic _________ that usually possess a crystalline structure and can be represented by a chemical for
ladessa [460]

Answer:

The corect answer is c) naturally occurring; solids

Explanation:

Minerals exists as solid substances in nature consisting of one or more element chemically combined together formiming compounds with definite composition. As mentioned earlier single elements can form minerals and  examples of single element mineral are Silver, Carbon and Gold which are found in nature in their pure form and are mined.

Minerals are normally found in rocks, which may contain one ore more different types of minerals

7 0
3 years ago
Other questions:
  • A parchment fragment was discovered that had about 68% as much 14C radioactivity as does plant material on Earth today. Estimate
    6·1 answer
  • Which of the following reactions is spontaneous?
    8·1 answer
  • If 1.2 moles of ideal gas occupy a volume of 18.2 L at a pressure of 1.8 ATM what is the temperature of gas in degrees Celsius.
    10·1 answer
  • You are trying to determine the specific heat of a metal. You heat the 97 g piece of metal to 100 °C and place it in a calorimet
    13·1 answer
  • What is the pOH of a 0.0010 M solution of calcium hydroxide (Ca(OH)2)
    12·1 answer
  • Please help
    15·1 answer
  • How does technology help scientists know more about the atom
    9·1 answer
  • Are sperm and egg cells exact copies of the plant cell
    8·1 answer
  • Which on is right O&amp; Mg?<br> OMG<br> MgO<br> Mg2O2<br> Mg+2O-2
    11·2 answers
  • How many atoms in 10.0 g of Ar?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!