What is difference between ionic and covalent bond.
Answer:
The difference between an ionic and covalent bond is that an ionic bond is that an ionic bond is between a nonmetal and a nonmetal and a covalent bond between a metal and a nonmetal.
IONIC BOND:
NM-NM
COVALENT BOND:
[M+][NM-]
How many atoms are in 2 Fe?
1
2
3
4
Answer:
2 (two) atoms of iron
Explanation:
There are 2 iron atoms in the representation 2Fe. If the it indicates 2 moles of Fe, then it contains 1.2 × 10²⁴ atoms.
What is iron?Iron is 26th element in periodic table. It is classified into the d-block and is called a transition metal. The chemical symbol of iron is Fe. Fe is a good conductor both thermally and electrically and it is widely used in daily life and in industries.
The number of atoms in one mole of an element is 6.02 × 10²³ . This number is called Avogadri number. Hence one mole of every element contains Avogadro number of its atoms.
Thus, if 2 Fe represents 2 moles of Fe, then its number of atoms is :
2 ×6.02 × 10²³ = 1.2 × 10²⁴ atoms
If it just represent 2 atoms of Fe, then are just 2 Fe atoms.
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If the temperature changes in a chemical reaction, What has occurred?
A.There was no energy transfer.
B.Energy was transferred
C.Energy was destroyed
D.Energy was created
In a chemical reaction, if the temperature changes, it means that energy was transferred.
Explanation:In a chemical reaction, if the temperature changes, it means that energy was transferred. This is because chemical reactions involve the breaking and formation of chemical bonds, which requires energy.
For example, when a chemical reaction releases energy, the surroundings absorb that energy and the temperature of the surroundings increases. On the other hand, if a chemical reaction absorbs energy, the surroundings lose energy and the temperature of the surroundings decreases.
Therefore, the correct answer is B. Energy was transferred.
Which of the following is the best definition of a diatomic molecule?
A. molecule made from the covalent bond of 2 atoms of the same type
B. ionic compound with a net charge of 2
C. cation with 2 positive charges
D. compound made of 2 different elements
The correct option is A.
Diatomic molecules are molecules that are made up of only two atoms, the atoms can be of the same element or different elements. When the atoms are of the same element, the diatomic molecule is described as homonuclear; when the atoms are of different elements, the molecule is described as heteronuclear. The type of chemical bond that exist in diatomic molecule is covalent bond.
What kind of bond is created by a weak electrical attraction between polar molecules
your answer is hydrogen bond.
What accounts for the difference in the heights of the mercury and water columns
Final answer:
The differences in the heights of the mercury and water columns in barometers are attributed to their different densities and the way atmospheric pressure influences them, with mercury's much higher density allowing for a shorter and more practical barometer design. Atmospheric pressure at sea level supports a mercury column of approximately 760 mm high.
Explanation:
The difference in the heights of the mercury and water columns in barometers is primarily due to their different densities. Mercury is much denser than water, about 13.6 times more so. This significant difference in density means that a mercury barometer can be much shorter than a water barometer to measure the same atmospheric pressure. Atmospheric pressure at sea level supports a mercury column of approximately 760 mm high, which is a standard measurement. However, for water, because it is less dense, the corresponding column needs to be over 10 meters high.
The heights of these columns also vary with altitude. For instance, at higher altitudes like Denver, Colorado, or the summit of Mt. Everest, the mercury column does not rise as high due to the decrease in atmospheric pressure. Hydrostatic pressure, the pressure exerted by a fluid due to gravity, plays a crucial role in how these barometers work. Hence, using mercury allows for a more practical and manageable barometer design.
The difference in the heights of mercury and water columns in a barometer is primarily due to variations in density between the two liquids. A barometer measures atmospheric pressure by balancing the weight of a column of liquid against the atmospheric pressure pushing down on the liquid's surface.
Mercury, a dense liquid metal, is commonly used in barometers due to its high density. The greater density of mercury compared to water means that a shorter column of mercury can exert the same pressure as a taller column of water.
The relationship between pressure, density, and height in a fluid column is described by the hydrostatic pressure equation: [tex]\(P = \rho \cdot g \cdot h\), where \(P\)[/tex] is pressure, [tex]\(\rho\)[/tex] is density, (g) is the acceleration due to gravity, and (h) is the height of the fluid column.
Because mercury has a higher density than water, a smaller height (h) of mercury is needed to balance the atmospheric pressure. In contrast, water requires a taller column to generate the same pressure due to its lower density.
In summary, the difference in height between the mercury and water columns in a barometer is a result of the varying densities of the two liquids, where the denser mercury requires a shorter column to balance atmospheric pressure compared to the less dense water.
The question probable may be:
What is the primary reason for the difference in height between mercury and water columns in a barometer, and how does the hydrostatic pressure equation explain this phenomenon?
If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?
Answer:
plato answer d
Explanation:
A closed loop through which current can flow is called a(n): ____________.
conductor
resistor
voltage source
circuit
A closed loop through which current can flow is called a circuit. It comprises conductors and usually includes components like resistors, which limit the flow of electric charge. Understanding electric circuits is key to using and designing electronic devices.
Explanation:A closed loop through which current can flow is called a circuit. This closed path is provided by conductors, such as metal wires, which connect a load to the terminals of a battery. The load can be a variety of devices, and it is generally represented as a zigzag symbol in circuit diagrams, which signifies a resistor. The resistor is a component that limits the flow of electric charge, and if multiple resistors are present, they affect the total or equivalent resistance of the circuit. A short circuit, on the other hand, is a low-resistance path directly between the terminals of a power source, which can bypass the intended circuitry and potentially cause damage.
Electric circuits are fundamental to modern electrical devices and systems. By understanding how circuits function and how components like resistors influence the flow of current, we can effectively design and troubleshoot these electric pathways.
Final answer:
A closed loop through which current can flow is called a circuit, which consists of a complete pathway for electricity enabled by conductors that connect components in a closed loop, often represented in schematics by specific symbols.
Explanation:
A closed loop through which current can flow is called a circuit. In the context of electrical engineering and physics, a circuit typically consists of conductors such as metal wires, which supply a path for electric current to flow. These conductors connect a voltage source, like a battery, to various elements like resistors, which regulate the flow of electric current. The battery is indicated by parallel lines, while the resistor is denoted by a zigzag symbol in schematic diagrams.
It's essential to understand that a circuit provides a complete, enclosed path for electricity to move. Without this closed path, current cannot flow effectively and the circuit would be considered 'open'. Electric circuits are the foundations upon which all modern electronic appliances operate, guiding electric charge through different components to perform work or relay information.
You calculate that 391 000 00 0m is the answer to the problem you asked to write your answers in scientific notation which is correct
Answer: 3.19x10*8
Explanation:
Concerning the 10.0 mL of 0.50 M NaCl diluted to 100 mL of solution:
When a solution is diluted, does the dilution change the number of grams dissolved?
yes
no
Which kind of substance accepts an electron pair?
base
hydroxide ion
acid
alkali
Answer : The correct option is Acid.
Explanation :
Acid : Acids are those which accepts an electron-pairs.Base : Bases are those which donates ab electron-pairs.Alkali : It is a base that dissolves in water. It is basically a base and the pH greater than 7.Hydroxide ion : It is a poly-atomic ion which is negatively charged.Therefore, the acid is a substance which accepts an electron-pair.
Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain?
0.50
0.500979
0.500980
0.5010
HElP ASAP Please! brainliest aswell: If 56 grams of carbon monoxide burns in oxygen to produce 88 grams of carbon dioxide, the mass of oxygen involved in the reaction is
A.32
B.56
C.88
D.144
Will fluorine form an anion or a cation? Why?
The formation of a gas in a chemical reaction, due to ions changing places, often indicates that the reaction is which type?
A) synthesis
B) double-displacement
C) decomposition
D) single-displacement
Answer:
the answer is D, i just got a 100
Explanation:
im him
The formation of a gas in a chemical reaction due to ions exchanging partners typically indicates that the reaction is a double-displacement or double-displacement reaction.
Explanation:The formation of a gas in a chemical reaction, due to ions changing places, often indicates that the reaction is a double-displacement reaction. A double-displacement reaction involves two ionic compounds in aqueous solution where the anions and cations exchange partners, resulting in the formation of two new compounds. This type of reaction typically occurs in aqueous solutions and one of the new compounds formed is often a solid precipitate, a gas, or a molecular compound such as water.
Examples of double-replacement reactions include reactions where an acid reacts with a base to form a salt and water (neutralization), or when two soluble salts react and produce an insoluble salt precipitate or a gas. Overall, the distinguishing characteristic of a double-displacement reaction is that both reactants are compounds and they swap their anion or cation partners.
4Fe + 3O2 2Fe2O3
1. Classify the reaction that occurred between the iron and oxygen.
2. What evidence was there that a reaction took place?
Help me please!!
It is not possible to separate _____ by physical means.
a)Mixtures
b)Salt Water
c)Solutions
d)Compounds
Why there are only 20 amino acids, although a amino acid is coded by a single codon with three bases. That means by permutation, 3*3*3=27 amino acids must exist ??? ...?
Which chemical process is associated with the lattice energy for sodium chloride?
NaCl(g) → Na+(g) + Cl-(g)
NaCl(s) + H2O(l) → Na+(aq) + Cl-(aq)
Na(s) + 1/2 Cl2(g) → NaCl(s)
NaCl(s) → Na+(g) + Cl-(g)
Final answer:
The chemical process associated with the lattice energy for sodium chloride is represented by the reaction: NaCl(s) → Na+(g) + Cl-(g), highlighting the energy required to separate the ionic solid into gaseous ions.
Explanation:
The chemical process associated with the lattice energy for sodium chloride is the breakdown of solid NaCl in its constituent ions in the gas phase. The correct representation of this process is NaCl(s) → Na+(g) + Cl−(g). Lattice energy is a key concept in understanding the strength of the ionic bonds within a crystalline solid. It can be considered as the energy required to separate one mole of a solid ionic compound into its gaseous ions, which is an endothermic process. The lattice energy of sodium chloride (NaCl) is significant because it helps to explain the high melting and boiling points of ionic compounds, indicating strong interionic attractions within the lattice structure.
A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. Which are the limiting reactants for each reaction? Based on this, calculate the maximum yield of oxygen, carbon dioxide, and sulfur dioxide when 280 g of black powder is burned. When the pyrotechnician tested the firework, he found the actual yields of oxygen, carbon dioxide, and sulfur dioxide to be 81.57 g, 82.75 g, and 46.5 g respectively. What is the percent yield of each gas? Why should pyrotechnicians worry about the yield of the reactants in a firework? How does the yield affect the firework and the environment?
Answer:
it would be 82.75
Explanation:
Final answer:
To predict the performance and environmental impact of a firework, its theoretical yields of oxygen, carbon dioxide, and sulfur dioxide are calculated. Actual yields are compared to these theoretical yields to determine percent yield, while also considering limiting reactants and their effects on the reaction's end amount.
Explanation:
To calculate the theoretical yield of oxygen, carbon dioxide, and sulfur dioxide produced from the 280 g of black powder used in a firework, we must first write and balance the chemical reaction using the components of gunpowder: charcoal (carbon), sulfur, and saltpeter (potassium nitrate). Saltpeter acts as the oxidizing agent providing the oxygen needed for combustion. The actual amounts of products formed can then be compared with theoretical yields to find the percent yield:
The theoretical yield of oxygen: It is determined by the amount of potassium nitrate that decomposes.The theoretical yield of carbon dioxide: This is determined by the complete combustion of carbon present in the charcoal.The theoretical yield of sulfur dioxide: It is based on the complete reaction of sulfur in the gunpowder.Percent yield for each gas is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. Pyrotechnicians must be concerned with the yield of reactants in fireworks because it affects the quality and safety of the firework and the amount of pollution created, which impacts the environment.
Limiting reactants are substances that will be consumed first, restricting the amount of product formed. By identifying which compounds are limiting, a pyrotechnician can predict how much product will be generated.
What cannot be changed by turning 100 grams of ice into water?
a. mass
b. phase
c. volume
d. density
Which substance is the reducing agent in this reaction? 2KMnO4+3Na2SO3+H2O→2MnO2+3Na2SO4+2KOH
A waste collection tank can hold 18,754 kg of methanol, which has a density of 0.788 g/cm3. What is the volume of the waste collection tank?
Explanation:
Density is defined as the mass of the substance divided by the volume of the substance.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
Since, it is given that mass is 18,754 kg and density is 0.788 g/[tex]cm^{3}[/tex]. We know that there are 1000 grams in 1 kg.
So, 18,754 kg equals 18,754000 grams.
Hence, calculate the volume of the waste collection tank as follows.
Density = [tex]\frac{mass}{volume}[/tex]
0.788 g/[tex]cm^{3}[/tex] = [tex]\frac{18754000 g}{volume}[/tex]
volume = 23799492.38 [tex]cm^{3}[/tex]
It is known that 1 [tex]cm^{3}[/tex] equals 0.001 liter. So, 23799492.38 [tex]cm^{3}[/tex] equals 23799.49 liters.
Thus, we can conclude that volume of the waste collection tank is 23799.49 liters.
Answer : The volume of the waste collection tank is 23799.5 L
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
[tex]Density=\frac{Mass}{Volume}[/tex]
Given :
Mass of methanol = 18754 kg = 18754000 g (1 kg = 1000 g)
Density of methanol = [tex]0.788g/cm^3[/tex]
Now put all the given values in the above formula, we get:
[tex]0.788g/cm^3=\frac{18754000g}{Volume}[/tex]
[tex]Volume=23799492.38cm^3=23799492.38mL=23799.5L[/tex]
Conversion used : [tex](1cm^3=1mL=0.001L)[/tex]
Therefore, the volume of the waste collection tank is 23799.5 L
How many pints are in 53 gallons'?
Which one of the following chemical formulas represents an organic molecule?
A.4H2O
B.H2SO4
C.CCl2F2
D.Al2O3
The answer is C.CCl2F2.
Which statement best relates to how the structure of a lipid influences the lipid’s function?
The ends of the lipid are attached to each other.
Lipids contain fatty acids and glycerol.
A lipid is made up of a long chain of phosphorus molecules.
A phospholipid has a charged head and an uncharged tail.
Answer:
A phospholipid has a charged head and an uncharged tail
Explanation:
because
1.6 moles of phosphorus, P8 reacts with oxygen gas to form tetraphosphorus decoxide. How many grams of P4O10 are formed?P8 + 5O2 --> 2P4O10
1.6 moles of phosphorus (P) will form approximately 113.6 grams of tetraphosphorus decoxide (P4O10) when reacting with oxygen.
Explanation:Phosphorus (P) has a molar mass of 31 g/mol, and the compound formed, tetraphosphorus decoxide (P4O10), has a molar mass of 284 g/mol.
You have 1.6 moles of phosphorus. In the balanced chemical equation, P8 + 5O2 --> 2P4O10, we can see that 1 mole of P8 produces 2 moles of P4O10. Since one P8 consists of 8 P atoms, this means that 8 moles of P forms 2 moles of P4O10. A simple cross-multiplication gives us that 1.6 moles of P form 0.4 moles of P4O10.
To translate this to grams, we know that one mole of P4O10 is 284 grams. Multiplying 0.4 moles with the molar mass of P4O10, we get that 1.6 moles of P form approximately 113.6 grams of P4O10.
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A water molecule is composed of two hydrogen atoms and one oxygen atom arranged in a bent shape. Since oxygen is significantly more electronegative than hydrogen, oxygen atoms have a much stronger attraction to shared electrons than does hydrogen. This unequal sharing of electrons and bent shape results in water being called a _________________ .
A)
polar molecule
B)
magnetic molecule
C)
ionic molecule
D)
covalent molecule
Answer: A) polar molecule
Explanation: Polar molecules are molecules which contain atoms of different electronegativities.
Non polar molecules are molecules which contains atoms of same electronegativities.
Water is a polar covalent molecule formed by unequal sharing of electrons. Oxygen being more electronegative tend to keep the electron pair towards itself thus generating a partial negative charge. The hydrogen acquire a partial positive charge thus resulting in a polar molecule.
The bent shape is due to repulsion between lone pairs and bond pairs of electrons.
A scientist wants to test how much of an acid can be added to a solution before the pH of the solution changes to below a certain point. The starting pH of the solution is 6.0, and the scientist wants to know when the pH of the solution changes to below 5.0.
Which pH indicator should the scientist use?
A.Phenolphthalein, which changes from colorless to purple around a pH of 8.3
B.Cresol red, which changes from yellow to purple around a pH of 7.2
C.Congo red, which changes from red to violet around a pH of 5.0
D.thymolphthalein, which changes from colorless to blue around a pH
Answer:
The correct answer is option C, that is, congo red that changes from red to violet around a pH of 5.0.
Explanation:
Congo red refers to the sodium salt of benzidinediazo-bis-1-naphthylamine-4 sulfonic acid. It is a diazo dye, which is blue in acid solution and red in alkaline solution and is used mainly as a biological stain and as an indicator. Congo red is an indicator, which is red at pH 5.0, and blue-violet at pH 3.0. In microscopy and histology, Congo red has an application for staining in amyloidosis, for the outer membrane of Gram-negative bacteria, and for the cell walls of plants and fungi.
Which of the following type of rock formation is the LEAST likely to contain a fossil?
Limestone
Granite
Shale
Sandstone
Answer:
Granite
Explanation:
Fossil is a well preserved remains or traces of plant and animals. Fossil are found in various kind of rock. Usually in rocks that can create the necessary environment to conserve life. Rocks that has vital nutrient and conducive environment to nurture life contain fossils.
Granite is the only rocks least likely among the option that can harbor life and invariably contain fossil due to the mode of formation. Granite is an intrusive igneous rocks . Granite is formed from a molten liquid called magma .This magma solidify below the earth surface to form granite. The temperature were this rock form is usually high and it rarely support life. Plant and animal cannot strife in the kind of environment that produce granite because of the temperature therefore if this creature cannot live their, the remains can hardly be found.
Generally, granite cannot preserve fossils.