Answer:
In flame of pure hydrogen burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) with the release of energy. In atmospheric air rather than pure oxygen, hydrogen combustion may yield a small amount of nitrogen oxides with the water vapor. The energy released allows hydrogen to be used as a fuel.
Explanation:
Here are the steps that occur during the combustion of hydrogen; Initiation, Propagation, Completion, and Energy Release.
The combustion of hydrogen involves a chemical reaction with oxygen in the air, resulting in the release of energy in the form of heat and light.
Initiation: The combustion process begins by supplying energy to break the initial bonds in the reactant molecules. In the case of hydrogen combustion, heat or an external ignition source is provided to break the diatomic hydrogen molecules (H₂) into individual hydrogen atoms (H).
H₂ → 2H
Propagation: Once the hydrogen molecules are dissociated into hydrogen atoms, they react with oxygen (O₂) molecules from the air. This reaction occurs in a chain reaction mechanism involving three steps: initiation, propagation, and termination.
Initiation: Hydrogen atoms react with oxygen molecules to form hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH).
H + O₂ → HO₂
H + HO₂ → H₂O₂
Propagation: The hydroxyl radical (OH) reacts with hydrogen molecules to form water vapor (H₂O) and release heat.
OH + H₂ → H₂0 + H
Termination: The chain reaction terminates when two radicals combine to form stable products.
H + OH → H₂0
Completion: The chain reaction continues as long as there is a sufficient supply of hydrogen and oxygen. The hydrogen atoms released in the propagation step can initiate further reactions with more oxygen molecules, leading to the complete combustion of hydrogen to form water vapor (H₂O).
H₂ + O₂ → H₂O
Energy Release: The combustion of hydrogen is an exothermic reaction, which means it releases energy in the form of heat and light. This energy is responsible for the heat and light produced by a burning hydrogen flame.
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Carbon burns in the precence of oxygen to give carbon dioxide.which element equation describes the reaction
Answer:
not going to lie... i suck at science
Explanation:
sorry
The compound ammonium bromide is a strong electrolyte. Write the reaction when solid ammonium bromide is put into water:
Answer:
NH4+ + H2O ==> NH3 + H3O+
Explanation:
Ammonium bromide, NH4Br, is the ammonium salt of hydrobromic acid. The chemical crystallizes in colorless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water.
1. Who conceived of an atomic model in which positive and negative particles were mixed together throughout the entire atom?
What are two external structures that help a frog survive?
Answer:
muscular jumping leg (helps them escape predators, chase after prey), webbed foot (helps them live in both aquatic and land environments), and they can store poison (that is used to attack or defend) in their glands
Explanation:
:)
Hemophilia is a genetic blood disorder. The female parent must carry one copy of the gene for the child to inherit hemophilia. Also, males have a greater probability of getting hemophilia than females.
HELP PLZ
Which type of trait is hemophilia?
sex-linked recessive
multiple allele
environmental
dominant
Answer:
Sex-linked recessive
Explanation:
Male's have a higher chance of getting it than female's just like red-green color blindness.
Answer:
A.
Explanation:
Gravity affects the of an object but not its .
Answer:
weight, mass
Explanation:
Gravity affects the weight of an object but not its mass. Your body's weight can change on different planets, but your mass will ALWAYS stay the same.
Answer:
Gravity affects the weight of an object but not its mass.
Explanation: plato :3
Hope this helps!
What is the mass of an object if its density is 12.3 g/ml and it has a volume of 25 ml?
[tex]density \: = \frac{mass}{volume} [/tex]
mass = 12.3 × 25
= 307.5
approximately = 308 g
1. Find at least 3 elements named after countries
2. Find at least 3 elements named after scientists (and name the scientist)
3. Find 1 element named after a state and 1 after a continent
4. Find 3 elements named after planets
5. Find 1 element that sounds like your name and 1 that sounds like it should be in a comic book
6. Find atleast 5 elements whose symbols do not match their names
7. What is the only letter not appearing on the periodic table as a symbol or part of the symbol?
8. Find the element that makes plumbing pipes. is it a medal, nonmetal or metaloid
9. Find the element that makes glowing signs, what special group is it in?
10. Find the element that makes milk good for your health. is it a metal, nonmetal or metalloid?
Answer:
1. Elements named after Countries or Places
Americium
Am
Made in 1945 at Chicago USA
Berkelium
Bk
Made in 1950 at the University of California, Berkeley, USA
Californium
Cf
Made in 1950 at the University of California, Berkeley, USA
Copper
Cu
The Romans were the biggest users of copper. Their source of copper was the island of Cyprus. Their name for the island was "Cyprium". They called the metal "Aes Cyprium" - metal of Cyprus. The name became shortened to Cyprium which then became "Cuprum" from which copper gains its modern day symbol.
Francium
Fr
Discovered in 1939 at the Curie Institute, Paris, France.
Gallium
Ga
Named after the Latin name for France - Gallia
Germanium
Ge
Discovered in 1886 by a German Chemist - Winkler.
Polonium
Po
Discovered in 1898 by Marie Curie, who was Polish.
Scandium
Sc
Discovered and mined in Scandinavia
Strontium
Sr
Named after Strontian, a small village in the Western Highlands of Scotland.
__________________________________________________________
4. Elements named after Planets
Helium
He
From the Greek word "Helios" - the Sun. In 1868 during an eclipse of the Sun, Scientists observed a spectral line caused by an unknown element. They named the element Helium. Twenty seven years later in 1895, the element was discovered on Earth.
Neptunium
Np
Named after the planet Neptune. Find the position of the three planets Neptune, Pluto, and Uranus in the Solar system. Now find the position in the Periodic Table of the three elements named after these planets...
Plutonium
Pu
Named after the planet Pluto
Uranium
U
Named after the planet Uranus. The element was discovered in 1789, shortly after the discovery of the planet.
Elements named from Mythology
Tantalum
Ta
Named after the Greek mythological king, Tantalus. It was discovered in 1802 and great difficulties were encountered in dissolving its oxide in acid to form salts. It proved to be a tantalizing problem!
Niobium
Nb
Named after Princess Niobe, the daughter of King Tantalus. According to legend, father and daughter were always found together and were very much alike. The two elements Niobium and Tantalum are usually found together in nature and their properties are very similar. Niobium was discovered in North America in 1801 and was originally named Columbium. It was renamed in 1844 after the connections with tantalum was realized. Find the positions of both elements in the periodic table
Thorium
Th
Named after Thor, the Scandinavian God of War and Thunder. It was discovered and named in 1828. Coincidentally, thorium is used today as a nuclear fuel in nuclear weapons and reactors.
Titanium
Ti
Named after Titans, the Greek supermen. Titanium is an extremely strong metal which resists attack by acids.
Vanadium
V
Named after Vandis, the Scandinavian Goddess of Beauty. The salts of vanadium have beautiful colors.
3. Elements named after Famous Scientists
Curium
Cm
Made in 1944 at Chicago. It was named in honor of Marie and Pierre Curie.
Einsteinium
Es
Made in 1952 at the University of California. It was named in honor of Albert Einstein.
Lawrencium
Lw
All of the man-made elements have been made as a result of the Nuclear Age. The majority of these elements were made at the University of California USA, in a machine called the Cyclotron. The Cyclotron was invented by Professor Ernest Lawrence. Lawrencium was made at the University of California in 1961 and named in his honor.
Mendelevium
Md
Made in 1955 at the University of California. It was named after a world famous Russian Chemist Dimitri Mendeleev.
------------------------------------
8. The chemical symbol for lead is Pb, which comes from the Latin word plumbum, meaning "waterworks," referring back to ancient times when the metal was widely used in the construction of water pipes.
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I hope this helps!
Next, drag the red block back into the water. Hold it underwater, and quickly record the water level before the block rises. Type the correct measurement in the box. The water level with the red block completely underwater is ____ milliliters.
Answer: 29.6 milliliters
Answer:
4.1 ml
Explanation:
Fluorine,chlorine and bromine are all in the same group (group7) of the periodic table because they ______ in a similar way
Which organism is part of Kingdom Fungi? ciliates lichen paramecium slime molds
Answer:
Slime.
Once upon a time, slime was part of the fungi kingdom. Now it's not, according to experts.
Hope this helps!
What is standard volume
Answer:
brainliest plls
Explanation: The volume of an ideal gas at standard temperature and pressure: 22.414 liters.
Use the oxidation states as indicated by the superscript numbers to answer the questions. k( 1)cl( 5)o3(-2) → k( 1)cl(-1) o2(0) which element is oxidized? which element is reduced? which element does not change in the oxidation state? how many electrons will be moved to have a balanced reaction?
Oxygen gets oxidized and potassium and chlorine get reduced. The number of electrons moving to have a balanced reaction is 6.
What is an oxidation number?The number of allocated elements in a chemical combination is termed an oxidation number. The oxidation number is generally the count of the number of electrons that a molecule or atom shares, loses, or gains during bond formation.
The given chemical equation will be
[tex]\rm 2K ^+ + 2Cl^+ + 2O_3^{2-} = 2KClO_3[/tex]
In this reaction, oxygen gets oxidized and potassium and chlorine get reduced.
The number of electrons moving to have a balanced reaction will be
Number of electron = 2 × 3 = 6
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Answer:
Answer down below
Explanation:
Which statement best describes how chemical equations demonstrate conservation of mass?
Lavoisier's Law states:
'Mass is neither created nor destroyed' in chemical reactions.
Which of the following is the balanced chemical equation for photosynthesis? a. 6H2O 6CO2 → 6O2 C6H12O6 b. C6H12O6 6O2 → 6H2O 6CO2 c. H2O CO2 → O2 C6H12O6 d. C6H12O6 O2 → H2O CO2.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
5.27 g
269
6900
on
Answer:
5.27
Explanation:
what makes up a molecule of oxygen gas?
Answer:
2 oxygen atoms make oxygen gas
A molecule of oxygen gas is composed of two oxygen atoms chemically bonded together. The symbol for oxygen is "O," and the atomic number is 8, indicating that each oxygen atom has 8 protons in its nucleus.
A covalent bond is a type of chemical bond that occurs between two atoms when they share one or more pairs of electrons. It is a strong bond that holds atoms together to form molecules.
In a covalent bond, atoms share electrons in order to achieve a more stable electron configuration, typically by filling their outermost energy levels (valence shells). By sharing electrons, both atoms involved in the bond can achieve a more stable configuration, similar to the noble gas configuration.
In an oxygen gas molecule, the two oxygen atoms are held together by a covalent bond. Covalent bonds involve the sharing of electron pairs between atoms. In the case of oxygen gas, each oxygen atom shares two electrons with the other oxygen atom, resulting in a stable molecule.
Therefore, a molecule of oxygen gas is made up of two oxygen atoms (O) bonded together by a covalent bond.
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Homogenized milk is a colloid. It has been treated to prevent its different components from separating when it stands. When non-homogenized milk stands, the cream rises to the top because it is less dense than the rest of the milk. Which type of mixture is non-homogenized milk? Explain your answer.
Answer:
Heterogeneous mixture
Explanation:
A homogeneous mixture is defined as a mixture in which the constituents of the mixture are uniformly distributed. A typical example of a homogeneous mixture is when a salt is dissolved in water.
A heterogeneous mixture refers to a kind of mixture whereby the composition of the mixture is not uniform. A typically example of a heterogeneous mixture is non-homogenized milk.
Since non-homogenized milk is not homogeneous, the cream rises to the top and separates from the rest of the mixture because the emulsion has not been stabilized. However, homogenized milk is just milk whose emulsion has been stabilized the cream does not separate when left to stand.
32.2 g of ethyl alcohol is dissolved in water to make a 0.50 L
solution. What is the molarity of the solution?
If 32.2 g of ethyl alcohol is dissolved in 0.50 L water to make a solution, the molarity of the solution will be 1.398 mol/L or 1.398 M
Molarity
The molarity of a solution is the ratio of the number of moles of solutes and that of the volume of solvent in the solution.
Mathematically:
Molarity = number of moles/volume in L
Number of moles of 32.2 g ethyl alcohol = mass/molar mass
= 32.2/46.07 = 0.699 moles
Molarity of the solution = 0.699/0.50
= 1.398 mol/L or 1.398 M
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A 0.250 L sample of chlorine gas is collected at a pressure of 105.3 kPa and a temperature of 505 K. What will the volume be if the pressure changes to 100.3 kPa and the temperature decreases to 495 K?
Answer:
V2 = 0.257 LExplanation:
T1 = 505 K
P1 = 105.3 kPa = 1.04 atm
V1 = 0.250 L
T2 = 495 K
P2 = 100.3 kPa = 0.990 atm
V2 = ?
P1V1/T1 = P2V2/T2 must be changed to T2P1V1/T1/P2495 x 1.04 x 0.250 ÷ 505 ÷ 0.990 = V2
V2 = 0.257 L
So 0.257 L is the answer!!
When an electric current is passed through an electrolytic cell, how can we recognise that electrolysis is taking place?
when electric current is passed through an electrolytic cell we can recognise that electrolysis is taking place by :
*there may bubbles of different gases formed on the electrodes.
*if we add vinegar or lime juice we find more bubbles forming
by the we can identify
What is the pH of a solution with a concentration of 0.01M hydrochloric acid?
Now
[tex]\\ \sf\longrightarrow pH=-log[H^+][/tex]
[tex]\\ \sf\longrightarrow pH=-log10^{-2}[/tex]
[tex]\\ \sf\longrightarrow pH=2[/tex]
What is the reason of formation of millions of organic compound
When 2. 0 mol CO2 is heated at a constant pressure of 1. 25 atm, its temperature increases from 250 K to 277 K. Given that the molar heat capacity of CO2 at constant pressure is 37. 11 JK-1mol-1 , calculate q, ∆ H and ∆ U
Answer: See below
Explanation:
[tex]\mathrm{At \ constant \ pressure \ the \ heat \ generated \ and \ change \ in \ enthalpy \ are \ equal:} \\\begin{aligned}Q &=\Delta H=n C_{p} \Delta T \\&=2 \times(37.11)(277-250) \\&=2003.94 \mathrm{~J} \\Q &=\Delta H=2.0 \times 10^{3} \mathrm{~J}\end{aligned}[/tex]
[tex]\mathrm{Calculate \ the \ change \ in \ internal \ energy:} \\$$\begin{aligned}\Delta H &=\Delta U+\Delta(P V) \\\Delta U &=\Delta H-n R \Delta T \\&=(2003.94)-(2 \times 8.314 \times(277-250)) \\&=(2003.94)-(448.96) \\\Delta U &=1554.98 \mathrm{~J}\end{aligned}[/tex]
What is another name for green algae?
A. ferns
B. Chlorophyta
C. bryophytes
D. hornworts
Chlorophyta is another name for green algae.
What is green algae?Green algae is a large and diverse group of photosynthetic organisms that are typically green in color due to the presence of chlorophyll. They are found in a variety of habitats, including freshwater, saltwater, and moist terrestrial environments.
Chlorophyta is a phylum of green algae, which are photosynthetic eukaryotic organisms. They are commonly found in freshwater, but can also be found in marine and terrestrial habitats.
Chlorophyta are characterized by their green pigmentation due to the presence of chlorophyll a and b, as well as other accessory pigments.
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Answer:Chlorophyta
Explanation:
What air pollutants can result from burning fuelwood?
Answer:
These air pollutants consist of...
Carbon monoxideNitrogen oxidesClimate changeFossil fuelsOrganic compounds. Just because they are organic does not mean they are good for the environment.
The temperature of aluminum increases from 30.0 to 38.0 °C and absorbed 900.J. Calculate the mass of aluminum used if the specific heat is 0.902 J/gK.
please help!!!!
Answer:
The mass of aluminum is 124.72 g
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of energy that causes a change in the temperature of a substance. In other words, sensible heat is that heat that causes the temperature of an object to vary without affecting its molecular structure and therefore its physical state. Its mathematical expression is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
Q= 900 Jc= 0.902 [tex]\frac{J}{g*K}[/tex]m= ?ΔT= Tfinal - Tinitial= 38 °C - 30°C= 8°C as it is a temperature difference, it is indistinct if the temperature is expressed in ° C or ° K because the difference will be the same. So: ΔT= 8°C= 8 °KReplacing:
900 J= 0.902 [tex]\frac{J}{g*K}[/tex] *m* 8 °K
900 J= 7.216 [tex]\frac{J}{g}[/tex] *m
[tex]\frac{900 J}{7.216\frac{J}{g} } =m[/tex]
124.72 g=m
The mass of aluminum is 124.72 g
Which items are true concerning a typical "thermos bottle"?
A. Radiation is hindered by the silver coatings.
B. The silver coatings stop convection losses.
C. Conduction losses are prevented by the vacuum.
D. Convection is not possible because of the vacuum.
E. The glass walls will not conduct heat.
Answer:
A, C, and D!
Explanation:
The items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.
What is the significance of the radiation?Radiation is significant as it is the movement of heat energy from one place to another and plays a significant role in heat transfer as here in the thermos bottle, the silver coatings on the outside of the bottle help to prevent heat loss due to radiation, and the reflective portions further aid in such a process.
Hence, the items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.
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What is the most reliable measurement for the quantity of matter?
Answer:
Answer is: mass.
Explanation:
hope this helps!
Determine the empirical formula for :aluminum compound containing oxygen (alxoy) if 4.78g of al reacts and the total mass after reacting is 6.67g,
The empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
How to calculate empirical formula?According to this question, 4.78g of Al reacts with oxygen to form a total mass of 6.67g. This means that the mass of oxygen that reacted is 6.67 - 4.78 = 1.89g
Aluminum = 4.78gOxygen = 1.89gFirst, we convert each mass to moles
Al = 4.78 ÷ 27g/mol = 0.17molO = 1.89 ÷ 16g/mol = 0.12molNext, we divide each value by the smallest
Al = 0.17 ÷ 0.12 = 1.42O = 0.12 ÷ 0.12 = 1Multiply each value by 2
Al = 2.8 = 3
O = 2
Therefore, the empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
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