Answer : The correct option is, The solvent molecules surround the solute particles.
Explanation :
Dissolving process : It is defined as the process in which solute particles interact with solvent molecules.
When solute particles comes in contact with the solvent particles, firstly the solute particles break down into ions and this result in the Lattice energy of the solute particles.
When solute particles break down, it gets surrounded with the solvent particles and it results in the Hydration enthalpy of the particles.
Hence, the second step of dissolving process is when solvent molecules surround the solute molecules.
Answer:
c
Explanation:
the answer befor me is corect
Calculate the number of atoms in 4.2 moles of sulfur atoms.
Now, calculate the mass of these same 4.2 moles.
Please show work! I have no clue how to solve this.
Final answer:
To calculate the number of atoms in 4.2 moles of sulfur atoms, use Avogadro's number. To calculate the mass of these 4.2 moles, multiply the number of moles by the molar mass of sulfur.
Explanation:
To calculate the number of atoms in 4.2 moles of sulfur atoms, you can use Avogadro's number. Avogadro's number is equal to 6.022 x 10^23 atoms per mole. So, by multiplying the number of moles (4.2) by Avogadro's number, you can determine the number of atoms:
Number of atoms = 4.2 moles * (6.022 x 10^23 atoms/mole) = 2.53 x 10^24 atoms.
To calculate the mass of 4.2 moles of sulfur atoms, you need to know the molar mass of sulfur. The molar mass of sulfur is 32.07 g/mol. Multiply the number of moles by the molar mass to find the mass:
Mass = 4.2 moles * 32.07 g/mol = 134.754 g.
What set of coefficients would balance the following chemical equation? H3PO4 + RbOH H2O + Rb3PO4
What can happen when a fission chain reaction gets out of control?
In other words, the answer should be
This can cause an explosion.
posting this for future users to see!
The metals in Groups 1A, 2A, and 3A ____.
A) all have ions with a 1+ charge c. all form ions with a negative charge
b. gain electrons when they form ions d. lose electrons when they form ions
D.) Lose electrons when they form ions.
Which of the following statements is true about catalysts? and Why?
a. Catalysts slow down the rate of chemical reactions
b. All catalysts are enzymes
c. Catalysts are used up during a chemical reaction
d. Catalysts lower the activation energy of a chemical reaction
Your answer will be C. It's not D i just took the test
What mass of steam at 100 C must be mixed with 150 gram of ice at its melting point, in a thermally insulated container, to produce liquid water at 50 C?
Heat of fusion of water at its normal freezing or melting temperature = 333 kJ/kg
Heat of vaporization (or steam) = 2256 kJ/kg
Specific heat of water = 4180 J/kg K ...?
how many atoms are in a cracker
Which statement defines the heat capacity of a sample? the temperature of a given sample the temperature that a given sample can withstand the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin) the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure
Answer is: the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin).
Heat capacity of a sample is expressed in units of thermal energy per degree temperature (J/K).
Heat capacity is often defined relative to a unit of mass (J/kg·K or J/g·K), prefixed with the term specific.
For example, specific heat capacity of water is 4.184 J/g·K (Cp(H₂O) = 4.184 J/g·K).
The statement that defines the heat capacity of a sample is the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin).
WHAT IS HEAT CAPACITY?Heat capacity of a substance refers to the quantity of heat that is required to raise the temperature of the substance by 1°C or K.
The heat capacity of a substance can be measured in Jg/°C or JK/g.
The heat capacity of water molecule is 4.184 Jg/°C.
Therefore, the statement that defines the heat capacity of a sample is the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin).
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I need help! how many moles are in 3.4*10^-7 grams of silicon dioxide, SiO2. I got 2.0^17 but I think it's wrong :(
Fe(NO3)2 not sure how to get the oxidation numbers of all elements
Final answer:
To find the oxidation numbers in Fe(NO3)2, we acknowledge that the sum is zero for a neutral compound. Each nitrate ion has an oxidation number of -1; thus, nitrogen is +5, and each oxygen is -2. Therefore, iron must have an oxidation number of +2 to balance the negative charge of the two nitrates.
Explanation:
To determine the oxidation numbers of elements in Fe(NO3)2, we follow the general rules for oxidation states. First, we know that the chemical compound as a whole is neutral, so the sum of all oxidation numbers in Fe(NO3)2 must be zero. Secondly, the oxidation number of oxygen is typically -2. In each nitrate ion (NO3−), there are three oxygen atoms contributing to a total of -6. The nitrate ion has a charge of -1, which means the nitrogen must have an oxidation number of +5 to balance the -6 from the oxygen atoms (x + 3(−2) = −1, x = +5).
Since there are two nitrate ions in Fe(NO3)2, this gives us a total negative charge of -2 from both nitrate ions. Consequently, the iron (Fe) must have an oxidation number of +2 to neutralize the charge from the nitrates (Fe2+). Thus, the complete set of oxidation numbers in Fe(NO3)2 is Fe2+ and two NO3− ions, with nitrogen being +5 and oxygen -2 in each nitrate ion.
Which of the following is an oxidation-reduction reaction?
SO2(g) + H2O(l) H2SO3(aq)
CaCO3(s) CaO(s) + CO2(g)
Ca(OH)2(s) + H2CO3(l) CaCO3(aq) + 2H2O(l)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)
Answer:
Explanation: Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. Reduction reaction is defined as the reaction in which a substance gains electrons.
For the given options:
Option A: [tex]SO_2(g)+H_2O(l)\rightarrow H_2SO_3(aq)[/tex]
This is a combination reaction because two compounds are reacting to form a single compound.
Option B: [tex]CaCO_3(s)\rightarrow CaO+CO_2[/tex]
The above reaction is decomposition reaction because a single compound is breaking down into two compounds.
Option C: [tex]Ca(OH)_2(s)+H_2CO_3(l)\rightarrow CaCO_3(aq)+2H_2O(l)[/tex]
The above reaction is a neutralization reaction because an acid reacts with base to produce salt and water.
Option D: [tex]C_6H_{12}O_6(s)+6O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex]
The oxidation state of oxygen changes from 0 to -2, it is gaining electrons. Thus, it is getting reduced and it undergoes reduction reaction. The carbon is getting oxidized and thus it undergoes oxidation reaction.
Thus, it is considered as redox reaction.
Hence, the correct answer is Option D.
Why does the potassium atom tend to lose only one electron?
Which of the following elements has the most properties in common with iron (Fe)?
cobalt (Co)
osmium (Os)
manganese (Mn)
chromium (Cr)
Answer:
Osmium
Explanation:
Got it right on the test.
Balance the equation, if necessary, for the reaction between iron and oxygen.
Fe + O₂ → Fe₂O₃
Answer:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Explanation:
The unbalanced reaction of the reaction between iron and oxygen is shown below as:-
[tex]Fe+O_2\rightarrow Fe_2O_3[/tex]
On the left hand side,
There is 1 iron atom and 2 oxygen atoms
On the right hand side,
There are 2 iron atoms and 3 oxygen atoms
Thus,
Right side, [tex]Fe_2O_3[/tex] is multiplied by 2.
Left side, [tex]O_2[/tex] must be multiplied by 3 and [tex]Fe[/tex] by 4 so to balance iron and oxygen.
Thus, the balanced reaction is:-
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
What chemical elements does this reaction contain?
C + O2--> CO2
carbon and oxygen
carbon, oxygen, and carbon dioxide
calcium, oxygen, and calcium dioxide
calcium and oxygen
Answer:
A
Explanation:
This chemical reaction contains the elements carbon and oxygen.
The chemical symbol for the element carbon is C. The symbol for oxygen is O. Carbon dioxide (CO2) is a compound, not an element.
The given reaction C + O2 → CO2 contains the chemical elements carbon and oxygen. The reactant C represents carbon, while O2 represents oxygen as a diatomic molecule. The product CO2 represents carbon dioxide, which is composed of one carbon atom and two oxygen atoms.
Explanation:In the given reaction C + O2 → CO2, the chemical elements involved are carbon and oxygen. The reactant C represents carbon, while O2 represents oxygen as a diatomic molecule. The product CO2 represents carbon dioxide, which is composed of one carbon atom and two oxygen atoms.
One success of Johann Döbereiner's law of triads was that it organized most of the known elements into three-element groups based on similarities in their properties. (Points : 2)
True
False
Answer:
True.
Explanation:
In 1824, the German chemist Johann Dobereiner, when analyzing the chemical elements calcium (Ca), strontium (Sr) and barium (Ba), noticed a simple relationship between their atomic masses: the mass of the strontium atom was very close to mass average of the other two elements. This observation was named the Triads of Chemical Elements and thus was born the law of the triads of Johann Döbereiner.
This law argued that elements with similar properties, ie, which reacted similarly with other elements, were organized in groups of three.
Where does a mid ocean ridge form?
What is the difference between the electron shells, the subshells, and the orbitals?
What is the conversion of 160g to cg?
A gaseous hydrogen and carbon containing compound is decomposed and found to contain 82.66% carbon and 17.34% hydrogen by mass. The mass of 158 mL of the gas, measured at 556 mmHg and 25 ∘C, was found to be 0.275 g. What is the molecular formula of the compound?
To find the molecular formula of a compound, one must first determine the empirical formula based on mass percentages, calculate the molar mass using the ideal gas law, and then compare the empirical formula mass with the molar mass.
Explanation:To establish the molecular formula for the gaseous compound, we start by calculating its empirical formula using the percentages given: 82.66% carbon (C) and 17.34% hydrogen (H). With the assumption of a 100 g sample, we have 82.66 g of C and 17.34 g of H. Converting these masses to moles, we use the atomic mass of carbon (12.01 g/mol) and hydrogen (1.01 g/mol), yielding:
The empirical formula is obtained by dividing by the smaller number of moles:
Since we cannot have half a hydrogen in a formula, we multiply by 2 to get whole numbers, giving us an empirical formula of C2H5. Next, we calculate the molar mass (MM) using the provided conditions (158 mL at 556 mmHg and 25
C with a mass of 0.275 g). We apply the ideal gas law:
PV = nRT
Converting the pressure to atmospheres (556 mmHg / 760 mmHg/atm) and the volume to liters (158 mL / 1000 mL/L), and using the value of R (0.0821 Latm/molk), the molar mass can be calculated. Finally, comparing the empirical formula mass (EM) to the MM obtained allows for the determination of the molecular formula by finding the ratio between MM and EM, which tells us how many empirical units are in the molecular formula.
To summarize:
the modern periodic table is arranged in order of increasing atomic
The modern periodic table arranges elements in order of increasing atomic number, which corresponds to the number of protons in an atom's nucleus. The increasing atomic number across the table helps predict properties and interactions of elements.
Explanation:The modern periodic table is an essential tool in chemistry, used to catalog and organize the known elements. The table is arranged in order of increasing atomic number, which is equivalent to the number of protons in an atom's nucleus.
For instance, Hydrogen has an atomic number of 1 and is the first element on the table, while Helium has an atomic number of 2 and is the second element. As you move down and across the table, the atomic number continues to increase.
This help scientists to predict the properties of various elements, their reactivity, and how they might interact with other elements.
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Waves we cannot actually see (unlike ripples) and those not needing a medium to travel within belong to this category of waves?
Electromagnetic waves can travel through a vacuum and do not require a medium. They include light, radio waves, and X-rays, among others.
Explanation:The category of waves that cannot be seen and do not require a medium to travel through is known as electromagnetic waves. Unlike mechanical waves such as sound waves and water waves which need a medium (solid, liquid, or gas) to propagate, electromagnetic waves can travel through a vacuum. These consist of oscillations in electric and magnetic fields and include gamma rays, X-rays, ultraviolet waves, visible light, infrared waves, microwaves, and radio waves. A quintessential example of electromagnetic wave travel is visible light from distant stars reaching Earth through the vacuum of space.
Electromagnetic waves, including varieties like gamma rays and radio waves, do not require a medium to travel and can propagate through a vacuum at the speed of light.
Explanation:The waves that cannot be seen and do not require a medium to travel through are known as electromagnetic waves. Unlike mechanical waves like sound and water waves, which require a medium such as air, water, or solids to travel through, electromagnetic waves can propagate through the vacuum of space. Some examples of electromagnetic waves include gamma rays, X-rays, ultraviolet waves, visible light, infrared waves, microwaves, and radio waves.
Electromagnetic waves are generated by the oscillations of electric and magnetic fields and they can move through a vacuum as they do not depend on a medium for their propagation. This characteristic allows electromagnetic waves to travel at a constant speed, known as the speed of light, which is approximately 2.99792458 × 108 m/s. Therefore, these waves are fundamentally different from mechanical waves, and this understanding is important for the study of physics and various applications in technology.
How many moles of dipyrithione (C10H8N2O2S2) contain 8.2 x 10^24 atoms of N2?
Answer : The number of moles of dipyrithione are [tex]1.4\times 10^1[/tex] moles.
Explanation :
The given molecule is, [tex]C_{10}H_8N_2O_2S_2[/tex]
In this molecule, there are 10 atoms of carbon, 8 atoms of hydrogen, 2 atoms of nitrogen, 2 atoms of oxygen and 2 atoms of sulfur.
As we know that, 1 mole of substance contains [tex]6.022\times 10^{23}[/tex] number of atoms.
As, [tex]6.022\times 10^{23}[/tex] atoms of [tex]N_2[/tex] present in 1 mole of [tex]C_{10}H_8N_2O_2S_2[/tex]
So, [tex]8.2\times 10^{24}[/tex] atoms of [tex]N_2[/tex] present in [tex]\frac{8.2\times 10^{24}}{6.022\times 10^{23}}=13.6\approx 1.4\times 10^1[/tex] mole of [tex]C_{10}H_8N_2O_2S_2[/tex]
Therefore, the number of moles of dipyrithione are [tex]1.4\times 10^1[/tex] moles.
There are 6.8 moles of dipyrithione that contain 8.2 x 10²⁴ atoms of N₂, calculated using Avogadro's number and the composition of the molecule.
Avogadro's number (NA) is 6.022 x 10²³ mol⁻¹, which is the number of particles in one mole of a substance. Since each molecule of N₂ contains two nitrogen atoms, divide the total number of nitrogen atoms by two to find the number of N₂ molecules, and then divide by Avogadro's number to find the moles of N₂.
First, calculate the number of moles of N₂ by using the formula
[tex]n = \frac{N}{N_A}[/tex]
It relates the number of particles N to the number of moles n. In this case, N is the total number of nitrogen atoms given (8.2 x 10²⁴ atoms), which we divide by 2 to account for N₂, and then divide this number by Avogadro's number (6.022 x 10²³ mol-1) to find the moles of N₂:
nN2 = (8.2 x 10²⁴ atoms) / (2 x 6.022 x 10²³ mol⁻¹) = 6.8 moles of N₂
Since dipyrithione has one N₂ unit per molecule, the number of moles of dipyrithione is the same as the number of moles of N₂:
6.8 moles of dipyrithione will contain 8.2 x 10²⁴ atoms of N₂.
Water has a density of 0.997 g/cm^3 at 25 degrees C; ice has a density of 0.917 g/cm^3 at -10 degrees C. (question part a) If a soft drink bottle whose volume is 1.50L is completely filled with water and then frozen to -10 degrees C, what volume does the ice occupy? (question part b) Can the ice be contained within the bottle?
"The density of the water is given by the mass and the volume." The volume occupied by water is 1.63 L and ice cannot be contained in water as it has more volume.
What are volume and density?Volume has been inversely related to the density as increased volume decreases the density by their inverse relation. The division of the mass and volume gives the density of the substances.
Given,
Density of water = 0.997 g/cm³
Density of ice = 0.917 g/cm³
The volume of the soft drink bottle = 1.50 L
The volume of ice is calculated as:
Volume = mass ÷ density
V = 1495.5 ÷ 0.917
= 1630 cm³
The unit conversion is done as:
1 cm³ = 1 mL
1630 cm³ = 1630 mL = 1.630 L
Ice cannot be fitted into the soft drink bottles as the volume of ice 1.63 L is more than the volume of the bottle, 1.50 L.
Therefore, the volume of ice is 1.630 L.
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.
What happens when nitrogen fills its valence shell?
What happens when nitrogen fills its valence shell is that 3 electron are gained creating N3- ion
calculation
According to octet rule atom tend to have a total of 8 electrons in its valence shell Nitrogen is a non metal which is in atomic number 7.The electron configuration of nitrogen is 1S2 2S2 2P3 or [He] 2S2 2P3 or 2.5.. from the electron configuration above Nitrogen has 5 valence electrons, therefore it require to gain 3 electron in order to fill its valence shell. when 3 electrons are gained Nitrogen create N3- ion.what is the oxidation number of Cl in chlorate ion ClO3- ...?
Final answer:
The oxidation number of Cl in the chlorate ion (ClO3-) is +5. This is determined by assigning oxygen an oxidation number of -2 and ensuring that the sum of oxidation numbers equals the ion's charge, which in this case is -1.
Explanation:
To determine the oxidation number of Cl in the chlorate ion (ClO3-), we apply the rules for assigning oxidation numbers. Here's how:
Oxygen is normally assigned an oxidation number of -2 (rule 3).In a polyatomic ion, the sum of the oxidation numbers of all the atoms must equal the charge on the ion (rule 4). With three O atoms, we have 3(-2) = -6 total for the oxygen atoms.Since the chlorate ion has a charge of -1, the Cl atom must have an oxidation number that will result in the total sum of -1 when combined with the total -6 from the O atoms.Therefore, the oxidation number for Cl is +5, as the equation Cl + 3(-2) = -1 simplifies to Cl = +5.Pierce conducts an experiment in which waves collide in a way that the energy increases, which means that has occurred
It means the waves collides and constructive interference occurred.
Explanation:If the two waves coming from the opposite direction collide with each other, there are two way of their interference.
Constructive interference: An interference which results in the increase in energy. And it is when crust of a wave comes on the crust of second wave.Destructive interference: An interference which results in decrease in energy of the resulting wave and colliding waves cancel the result of each other.Hence in experiment there will be constructive interference.
Answer:
C.
Explanation:
I took the test!
which of the following is a good scientific hypothesis
A. plants grow towards windows because the sun provides the food they need.
B. if sunlight causes skin cancer, the people should stay put of the sun.
C. plants that don't get sunlight will die.
D. if a plant is exposed to only blue light, the plant will grow more slowly
A testable, precise prediction of what you believe will occur in a scientific experiment that is based on your observations and past knowledge is called a scientific hypothesis. Here the correct option is D.
A scientific theory must satisfy two requirements in order to be accepted: it must be testable and falsifiable. A theory is not scientific if it cannot be verified through observation. A hypothesis is a rough explanation for a group of facts that can be put to the test by specific follow-up research.
Among the given options, if a plant is exposed to only blue light, the plant will grow more slowly can be proved by performing an experiment. Thus it is an example of a scientific hypothesis.
Thus the correct option is D.
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what is the chemical formula for fluorine in standard state?
Final answer:
The chemical formula for fluorine in its standard state is F₂, which is a diatomic gas due to fluorine's high electronegativity.
Explanation:
The chemical formula for fluorine in its standard state is F₂. Fluorine is a diatomic molecule, meaning it naturally pairs up with another fluorine atom to form a molecule in its most stable and common form, denoted as F₂ gas. Rule 3 of assigning oxidation states is vital for fluorine due to its strong electronegativity, which is the highest among all elements. Thus, the F-F molecule can provide a reference point for calculating oxidation states of other elements.
When applying heat to a substance changes the form, but not the identity of the substance, this is evidence of:
a chemical change
a physical change
no change
an anthropomorphic change
Answer:
This is the evidence of physical change.
Explanation:
When the substance is heated, its form is changed but identity remain the same, it is then a physical change. In physical change substance can only change their phases but not lose the identity. For example it may change its state from solid to liquid and liquid to gas.
Physical change:
The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example s:
Water converting to Ice .
Water converting to gas.
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition.
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible .
These changes occur due to chemical reactions .
These may not be observed with naked eye .
Examples:
combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood .
Boiling of egg: that change the chemical composition of protein in the egg