Answer:
there are no valence electrons left over, so the molecule has four bond pairs and no lone pairs.
Explanation:
Which two reactions are faster than the others?
A. Methane burns in air that contains oxygen.
B. Silver tarnishes in air that contains hydrogen sulfide.
O C. A steel ship rusts in ocean water.
U
D. Hydrogen gas and oxygen gas react explosively to form water.
Answer:
i think its Hydrogen gas and oxygen gas react explosively to form water. and . Methane burns in air that contains oxygen.
Explanation: Mine was a little bit different than yours please forgive me if I'm wrong I chose answers that was similar to mine
Methane burns in air that contains oxygen and Hydrogen gas and oxygen gas react explosively to form water. These two reactions are faster than the others.
What is methane ?Chemically speaking, methane has the formula CH4. The simplest alkane and the primary component of natural gas, it is a group-14 hydride. The amount of oxygen breathed from the air might be decreased by high methane levels. This may include headaches, facial flushes, slurred speech.
Unscented, colorless, and combustible, methane is a gas. It is mostly used as fuel to produce heat and light. It is also employed in the production of organic compounds. Methane is frequently found in landfills, marshes, septic tanks, sewers, and other places where natural materials decompose.
Suffocation can result from high methane concentrations in enclosed spaces because methane reduces the amount of oxygen in the air. Lack of oxygen can cause headaches, nausea, lightheadedness, and unconsciousness.
Thus, option A and D are correct.
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Avocados have a pH of 6.27. Avocados are categorized as...
O Base
O An Acid
O Neutral
Answer:
Base
Explanation:
what is SI unit of e.m.f and p.d.
Answer:
Electromotive force or e.m.f is defined as the battery's energy per Coulomb of charge passing through it. like other measures of energy per charge emf has SI unit of volts , equivalent to joules per coulomb.
State three uses of oxidation number
Answer:
Explanation:
1. To identify what's been oxidised and what's been reduced in a redox reaction
2. In naming compounds
3. To work out reacting proportions in titration reactions
the chemical properties of calcium are most similar to the chemical properties of
Answer:
strontium and barium
Explanation:
Answer:
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.
Explanation:
Which sphere is dependent on all the other spheres in order to exist?
hydrosphere
lithosphere
atmosphere
biosphere
Answer:
biosphere
Explanation:
Living things need water (hydrosphere), chemicals from the atmosphere, and nutrients gained by eating things in the biosphere.
if you started with 2.34 grams of methane and 8.32 grams of oxeygyn and the combustion reaction went to completion how many grams of CO2 would be produced
Answer:
Mass of CO₂ produced = 5.72 g
Explanation:
Given data:
Mass of methane = 2.34 g
Mass of oxygen = 8.32 g
Mass of CO₂ produced = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/molar mass
Number of moles = 2.34 g/ 16 g/mol
Number of moles = 0.146 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 8.32 g/ 32 g/mol
Number of moles = 0.26 mol
Now we will compare the moles of carbon dioxide with oxygen and methane.
CH₄ : CO₂
1 : 1
0.146 : 0.146
O₂ : CO₂
2 : 1
0.26 : 1/2×0.26 = 0.13 mol
Less number of moles of CO₂ are produced by oxygen thus oxygen will react as limiting reactant.
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 0.13 mol × 44 g/mol
Mass = 5.72 g
An atom of element Be has four protons, four electrons, and five neutrons.
Which element below could be an isotope of this atom?
Answer:
b i took the edge test
Explanation:
Interactivity: Hot on the Inside
PLEASE HELP WILL GIVE BRAINLEST
Which relationship explains how the water can boil at room temperature?
A Lower air pressure results in a lower boiling point
B. Lower air temperature results in a lower boiling point
C. Lower air pressure results in a higher boiling point
D. Lower at temperature results in a higher boiling point
Answer:
Option A.
Lower air pressure results in a lower boiling point
Explanation:
This is because in an open system, the lower the pressure the lesser the energy that will be required for boiling point. The is little or no collision of air molecules with the surface of the liquid
But if there is increase in pressure, more energy will be required to get to boiling point because there will be strong collision between air molecules and surface of the liquid.
What is the mass of 7.00 moles of H2O2
Answer:
0.206 mol H₂O₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
7.00 moles H₂O₂
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O₂ - 2(1.01) + 2(16.00) = 34.02 g/mol
Step 3: Convert
[tex]7.00 \ g \ H_2O_2(\frac{1 \ mol \ H_2O_2}{34.02 \ g \ H_2O_2} )[/tex] = 0.205761 mol H₂O₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.205761 mol H₂O₂ ≈ 0.206 mol H₂O₂
Answer:
238.14
Explanation:
2 H + 2O
2(1.01) + 2(16.00) = 34.02
34.02*7 = 238.14
238.14
Change the following word equation into a formula equation AND balance it. Iron(III) carbonate --> Iron(III) oxide + Carbon dioxide
Will give brainliest blus 100 points
Which two changes would make this reaction reactant-favored?
2H2 + O2 + 2H20 + energy
A. Increasing the pressure
B. Reducing the temperature
O C. Increasing the temperature
O D. Reducing the pressure
Two changes would make this reaction reactant-favored
C. Increasing the temperature
D. Reducing the pressure
Further explanationGiven
Reaction
2H₂ + O₂ ⇒ 2H₂0 + energy
Required
Two changes would make this reaction reactant-favored
Solution
The formation of H₂O is an exothermic reaction (releases heat)
If the system temperature is raised, then the equilibrium reaction will reduce the temperature by shifting the reaction in the direction that requires heat (endotherms). Conversely, if the temperature is lowered, then the equilibrium shifts to a reaction that releases heat (exothermic)
While on the change in pressure, then the addition of pressure, the reaction will shift towards a smaller reaction coefficient
in the above reaction: the number of coefficients on the left is 3 (2 + 1) while the right is 2
As the temperature rises, the equilibrium will shift towards the endothermic reaction, so the reaction shifts to the left towards H₂ + O₂( reactant-favored)
And reducing the pressure, then the reaction shifts to the left H₂ + O₂( reactant-favored)⇒the number of coefficients is greater
Answer: C. Increasing the temperature
D. Reducing the pressure
Explanation:
How many total valence electrons are available for the Lewis Dot structure of H2S?
Answer:
8 Valence Electrons
Explanation:
There are 2 atoms of Hydrogen and 1 atom of Sulfur in the compound. Each Hydrogen atom has 1 electron (which is the valence electron).Sulfur has six valence electrons. Therefore, there is a total of eight valence electrons in H2S.Please answer correctly !!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!
Answer:
C
Explanation:
Hope this helps Mrs. or Sir
Which energy output objects work with the solar panels?
Answer:
A converter to convert from dc to ac
Explanation:
\Which layer is between the crust and the asthenosphere?
Answer:
Lithosphere
Explanation:
Answer:
Lithosphere
Explanation:
The Lithosphere is the outermost layer of the Earth of about 100km thick and it is a rigid layer that includes the brittle upper portion of the mantle and the crust. Lithosphere is the hard outer region which includes all of the crust and the uppermost mantle.
PLS PLS PLS HELP ME I WILL MARK Y OUT BRAINLYEST JUST PLS HELP ME :((
What is the mass in grams of 5.90 mol C3H18?
673 g
0.0512 g
19.4 g
389 g
3.55 x 1024
Answer:
319
Explanation:
The molecular mass of C3H18 can be found by adding up the molecular weights of carbon and hydrogen so, (12.01 x 3) For Carbon and (1.008x18) for hydrogen. You will find it is 54.174g/mol.
To find grams muliply g/mol by mols so 5.9 x 54.174= 319 i didnt see any errors with my math so maybe you clicked 8 by accident but i may just be wrong
Guys please help me.
Explain how an Ion of oxygen is different from an atom of oxygen and how are they similar
Explanation:
An atom is the smallest indivisible particle of any substance that takes part in a chemical reaction.
All atoms are identified by the number of protons in them. Protons are the positively charged particles in an atom.
Ions are atoms that have either lost or gained electrons. Therefore, they become charged. Atoms are neutral particles where the number of protons and electrons are the same.Therefore, atoms and ions are similar because the atom and ion of an element have the same number of protons but differs in the number of electrons they carry.
(PLS HELP)
Describe three of your favorite foods. How do they change phases of matter when they are heated?
Answer:
ice.
Explanation:
it becomes a liquid
HELLLLLLLP ASAP ITS DUE TODAAAAY :(
Answer:
the answer is j
Explanation:
Answer:
J. All of the above
Explanation:
Since the sun is tilted on it's axis, then the rays of the sun fall on the equator, directly, and that causes it to heat the equator more than the other regions.
Sometimes the sun's rays are on two tropics, Cancer and Capricorn, and that causes the Earth to heat unevenly, which causes wind and ocean currents to form.
Which of the following changes on different celestial objects due to the force of gravity?
Mass
Weight
Height
Width.
Beryllium has an atomic number of 4 and an atomic mass of 9. How many neutrons does Beryllium have?
Answer:5
Explanation:
NEED HELP ASAP
Identify the type of reation. 2 NO2 ----> 202 + N2
A)
Synthesis
B)
Decomposition
C)
Single Replacement
D)
Double Replacement
Answer:
B) Decomposition
Explanation:
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Chemical equation:
2NO₂ → 2O₂ + N₂
The given reaction is decomposition reaction. NO₂ decomposed to give nitrogen and oxygen. All other options are incorrect because,
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
PLEASE HELP
Which of the following shows the kinetic form of mechanical energy?
A. Pedaling a bicycle
B. Holding a basketball
C. Lying on the ground
D. Watching television
Answer: A. Pedaling a bicycle
Explanation: i also have the same question too and im in 5th grade
When you move one of the bonding pairs of a molecule closer to another one, what is the effect?
Answer:
They repel due to a force of repulsion
is cleaning a penny a chemical change or physical change
Answer:
physical
Explanation:
What happens when balanced forces act on an object at rest?
Answer:
Balanced forces do not cause a change in motion.
The result is no motion. Balanced forces can cancel each other out. Any time there is a balanced force, the object does not move.
Explanation:
Answer:
The result is no motion. Balanced forces can cancel each other out. Any time there is a balanced force, the object does not move.
Explanation: MARK MOST BRAINLIEST PLEASE
explain what a convection current is?
who ever sees this I hope you have a wonderful day!
Answer:
Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material.
Because particles within a solid are fixed in place, convection currents are seen only in gases and liquids. A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy.