Answer:
B). 2
Explanation:
The atoms of hydrogen (H) present on both sides of the given equation
Zn + 2HCl → ZnCl2 + H2 are 2.
What are atoms ?Atoms are the smallest fundamental unit of particle which can't be destroyed further by any chemical mean.
What is Hydrogen(H) ?Hydrogen is the lightest element in the periodic table having molecular formula(H2) . It is combustible, tasteless, odorless, colorless gas
What is Equation?Equation in chemical science is the way to represent change in the conversion of reactants to product in reaction using symbols given by IUPAC.
The given reaction is
Zn + 2HCl → ZnCl2 + H2
There are two moles produces two moles of hydrogen, hence there are two atoms of hydrogen on both sides.
Hence, there are two atoms of hydrogen(H) are present on both sides of the equation.
Hence, option B is correct.
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how many atoms are equal to 1.5 moles of hellium
Answer:
There are 1.8×1024 atoms in 1.5 mol HCl
Explanation:
What is the pH of a solution that has a [OH^-] of 1x10^-2?
2
12
9
8
can some kind soul help me plss
convert propanamine to propylalcohol
Answer:
Yeah
Explanation:
Propylene glycol can be dehydrated to propionaldehyde which can in turn be reductively aminated to propylamine.
Propionaldehyde can be converted to n-propyl amine in two steps.
Conversion of propionaldehyde to oxime
Propionaldehyde is treated with hydroxyl amine in weakly acidic medium to form imine product known as propionaldoxime.
CH₃CH₂CHO+NH₂OH->CH₃CH₂CH=N-OH+H₂O
Reduction of imine to form amine
In this step,propionaldoxime is reduced by proper reducing agent like Na in ethanol to form n-propyl amine.
CH₃CH₂CH=NO-Na-C₂H5OH-> CH₃CH₂CH₂NH₂
1
Select the correct answer.
Which type of energy is thermal energy a form of?
OA.
chemical energy
B.
kinetic energy
O c.
magnetic energy
OD
potential energy
Reset
Next
Answer:
i think kinetic energy sorry if I'm wrong.
Explain how the percentages of nitrogen , oxygens and carbon dioxide in the earth atmosphere today have changed from the earth
Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.
i would appreciate it if someone could show me the net ionization reaction for the following equation:
CaCl2(aq) + 2NaHCO3 -> CaCO3 + 2NaCl + CO2 + H2O
thanks in advance!!
Answer:
Deduce the balanced chemical equation:
CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)
2. Write as ionic species:
Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)
3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):
CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)
This is the balanced ionic equation.
A sample of neon gas at 200.0C has a pressure of 0.325 atm. At what Celsius temperature will the pressure reach 0.675 atm?
Answer:
407.7c
Explanation:
200.0C = 0.325 atm
400.0C = 0.650 atm
407.7C = 0.675 atm
A sample of neon gas at 200.0C has a pressure of 0.325 atm. The temperature is 407.7 C is by the pressure reaches 0.675 atm.
What are gas laws?There are three basis gas laws which relates the pressure, temperature, and volume of the gas.
The temperature and pressure increase is given this.
200.0C = 0.325 atm
400.0C = 0.650 atm
407.7C = 0.675 atm
Thus, the correct option is 407.7C = 0.675 atm.
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8. What is the chemical equation when calcium chloride combines with water?
Answer:
CaCI2 + H2O = Ca(OH)2 + HCI
The saturation point for a solution is 25.0 grams of solute per 500 grams of solvent. If you pour 50.0 grams of solute into 800. grams of solvent, how many grams of
solute are in solution?
Plz help me!!
Answer:
I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.
ito Ang naimbento ni graham bell na nagpabilis sa pakikupagtalastasan
Answer:
ФОТОГРОФИРУЙ
ИЛИ НАПИШИ
В КОМЕНТЫ
31. A mixture with sand, pink sugar and water would be best separated using
Answer:
Filtration and evaporation
Explanation:
A mixture of sand, pink sugar and water can be separated by filtration and evaporation.
The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.
The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.
Why are protists that are heterotrophs considered "animal-like"? A they make their own food. B They don't need energy C They feed on other organisms.
Answer:
A, Animal-like protists are called protozoa. ... Like animals, they can move, and they are heterotrophs. That means they eat things outside of themselves instead of producing their own food
Explanation:
An object is moving across a surface, but it does not gain or lose speed.which best describes the objects force
Answer:
Constant
Explanation:
Here's the definition of the noun:
"A situation that does not change"
In this case the situation is the speed of the object.
If you'd like to go into further detail, let's move away from English and jump into Physics. The question asked for "object's force" - keyword: 'force'. What's the formula for force? F = m * a.
F = Force, m = mass, a = acceleration.
Okay well, the question said only the speed changes and doesn't mention the mass changing so if the mass changes the force won't be constant. However, if the mass doesn't change (constant), we can continue to acceleration.
The formula for acceleration is (I think) m/s^2, that's metres over time, squared. As we know from English class; the speed is constant and thus the square of that speed is also constant - therefore the acceleration is constant.
Now, putting them together, assuming the mass is constant, we know the acceleration is constant so the force has to be constant. Case closed.
*mic drops, this was a waste of time*
An unknown substance has the chemical formula: Fez(C204)3 A molecule of the unknown substance contains A 3 fluorine atoms, 2 calcium atoms, and 4 oxygen atoms. 2 iron atoms, 6 carbon atoms, and 12 oxygen atoms. , 2 iron atoms, 2 carbon atoms, and 12 osmium atoms. 1 fluorine atom, 2 europium atoms, 8 copper atoms .
Answer:
Explanation: It is an ionic compound Fe2(C2O4)3
The compound with the formula Fe₂(C₂O₄)₃ contains two iron atoms, 6 carbon atoms and 12 oxygen atoms. Thus option C is correct.
What is chemical formula?Chemical formula of a compound or molecule represent the identity of the compound by representing which atoms are present in how many numbers.
Chemical formula is significant in representing a compound and distinguish it from other compounds.The number of each atom are given as subscripts for the symbol of each atoms.
If any group of atoms such SO₄ group or CO₃ group repeats in the compound put them in brackets and their number is given outside.The compound Fe₂(C₂O₄)₃ contains 2 iron atoms because Fe is the symbol of iron.
C₂O₄ is oxalate group and it is 3 in number. Two carbon and 4 oxygens are there in one oxalate group. Thus there are total 6 carbons and 12 oxygens in 3 oxalate groups. Hence option C is correct.
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C12H22011 → 12C + 11H20
How many atoms of hydrogen are involved in this chemical reaction?
A.11
B.22
C.33
D.44
Answer:
the answers to your question is b.22
Which would be true of a bar magnet?
Choose all that apply:
A. The magnet would be strongest at its two edges.
B. The bar has a uniform strength throughout.
C. The two ends of the magnet are called poles.
D. The two ends of the magnet are positively or negatively charged..
Answer:
C is a North Pole to South Pole
Explanation:
A magnet has two poles
An artificial biosphere is an enclosed area that contains the elements necessary for human life to exist. Suppose scientists want to develop an artificial biosphere on a new planet. The new planet has an atmosphere that is 96% carbon dioxide with only trace amounts of oxygen. What could humans do to make enough oxygen to survive? Explain your answer.
Answer:
See Explanation
Explanation:
A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.
If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.
What is the oxidation number of carbon in the compound carbon dioxide, CO2?
A) +3
B)+2
C)-3
D)+4
Answer:
the oxidation number is 4
What does the line with “alternating spikes and semicircles” mean?
Answer:
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
Explanation:
L means Low pressure, it brings stormy weather with strong winds.
H means High pressure, it brings fair weather and light winds.
The line with spikes is a cold weather front, it brings thunderstorms and colder
temperatures.
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
is smoke chemically combined?
Answer:
yes smoke is chemically combined because smoke is a collection of airborne solid and liquid particles and gases released when a material burn.
hope it is helpful to you
what is the mole ratio of zinc to sulfuric acid
Answer:
Zn + H2SO4 ZnSO4 + H2
Explanation:
Start by balancing the equation. This one is already balanced.
(1 zinc, 2 hydrogen, 1 sulfur and, 4 oxygen on each side of the equation).
The mole ratio just refers to the coefficient (the number before each molecule or atom). Since there are no numbers in this equation all coefficients are 1.
Mole ratio = 1:1
Please help!!!! Best answer will get brainliest
Answer:
covalent network
Explanation:
trust me on this one
how is density related to the color of igneous rocks?
Answer:
The density of igneous rocks is related to its color. Darker colored rocks have a higher density because of its greater mineral and iron content. Its characteristics is opposite compared to lighter colored rocks that have less density because of lower mineral and iron content
Because both tin and carbon are members of Group 4A(14), they form structurally similar compounds. However, tin exhibits a greater variety of structures because it forms several ionic species. Predict the shape and ideal bond angle, including any deviations, for SnCl3−.
Answer:
See Explanation
Explanation:
Elements in group fourteen are mostly known to form compounds in which there are four electron domains leading to a tetrahedral electron domain geometry.
However, the presence of lone pairs affects the shape of the molecule. SnCl3− has four electron domains, three of them are bond pairs while one is a lone pair. The shape of the molecule is based on a tetrahedron, however the observed geometry is trigonal pyramidal due to the presence of the lone pair. Its bond angle is now less than the predicted 109 degrees.
(1) Complete the word equation for the complete combustion of methane in
oxygen.
→ water +
methane +
en of methane can produce carbon and
Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.
3. Designing the caisson…Using technology you think would be available in the late 1800s, what could you do to keep temperatures in the caisson as low as possible? How else can you protect your workers from the dangers of high heat?
Answer:
By using insulating material.
Explanation:
By making the material cover with insulator in that way the we can protect the workers from the dangers of high heat because the insulator are the poor conductor of heat so the heat from the surrounding environment did not enter inside the metal. There are certain materials which remain cool if they receive heat from the surrounding environment so by using these types of materials can be useful on the cover of caisson to reduce heat in the inner side and protect the workers from the dangers of high heat.
Given the [H+] = 3.89x10^-7M, what is the [OH-]?
Answer:
[H][OH] = 10^-7
[OH] = 10^-7/ 3.89x10^-7 = 0.257M
20 POINTS 1. What is the contour interval of the above topographic map? 2. What is the change in elevation from point Y to point Z?
3. Which way does the Maple Stream flow?
4. Which hill is taller?
5. Which hill has the steepest sides?
6. What is the elevation of point A?
Answer:
1 1
Explanation:
Hill
1
molecular formula of calcium oxide
Answer:
Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.
write one word for the following short form of an element
Answer:
symbol?
Explanation: