The distance between the atoms of H−I is 1.61Å. What is the distance in meters?
A change in pressure would have the greatest effect on the solubility of a
Answer:gas in a liquid
Explanation:because it’s hard for gas to escape a space into a liquid
Why do amorphous solids not have a long-range order in the arrangement of their particles?
Their formation involves very rapid cooling.
They do not have enough particles.
Their particles eventually change positions.
Their particles always stay in the same positions.
Answer:
I think A is right
Explanation:
What change or changes in the state of a gas bring about each of the following effects? a. the number of impacts per unit time on a given container wall increases. b. The average energy of impact of molecules with the wall of the container decreases c. The average distance between gas molecules increases d. The average speed of molecules in the gas mixture is increased
The impacts per unit time on a wall increase with rising temperature or particle number, the energy of impacts decreases when temperature falls, the distance between particles increases with growing volume, and the molecule speed increases with rising temperature.
Explanation:The changes in the state of a gas that could bring about the effects listed are closely related to the principles established by Amontons's law, Charles's law and Boyle's law.
The number of impacts per unit time on a given container wall increases if the temperature or the number of gas particles is increased. This is due to a rise in the average speed of the particles, resulting in more frequent collisions as per Amontons's law. The average energy of molecular impacts on the container walls decreases when the temperature is decreased, since molecular kinetic energy is directly proportional to temperature. The average distance between gas particles increases when the volume occupied by the gas increases, assuming constant temperature and number of gas particles. This is in accordance with Charles's law. The average speed of gas particles increases when the temperature is increased, resulting in a higher average kinetic energy of the molecules due to the direct proportionality between kinetic energy and temperature. This follows Amontons's law. Learn more about Gas Laws here:
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what's the name for the phase change from solid to gas
Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass
Answer:
It is Henry Moseley
Explanation:
If solid NaCl is added to a saturated water solution of PbCl2 at 20o C, a precipitate is formed. How would this affect the value of the Ksp for [Pb2+][Cl-] in solution?
a) The Ksp increases.
b)The Ksp decreases.
c) The Ksp remains the same.
d) none of the above. ...?
Answer:
c) The Ksp remains the same.
Explanation:
The solubility product constant, Ksp is essentially an equilibrium constant which represents the extent to which a solute dissolves in a solvent.
In the given situation, the PbCl2 equilibrium can be represented as:
[tex]PbCl_{2}(s)\rightleftharpoons Pb^{2+}(aq)+2Cl^{-}(aq)[/tex]
[tex]Ksp = [Pb^{2+}][Cl^{-}]^{2}[/tex]
Addition of NaCl will introduce a common ion i.e. Cl-. This would increase its concentration and solubility. This will change the reaction quotient. However, the value of Ksp which is the 'equilibrium constant' will reamin unaffected since it is a constant at a given temperature.
Which chemical equation is unbalanced?
1.C + O2 → CO2
2.Sr + O2 → 2SrO
3.6H2 + 3O2 → 6H2O
4.H2 + H2 + O2 → H2O + H2O
The correct option is 2.
For a chemical equation to be balanced, the number of atoms of each element present in the reactants must be the same with that present in the products. If the number of atom of any element at any of the two side of the reaction is not the same, then the equation is not balanced. Looking at the options given above, it will be noticed that for option 2, the number of Sr atom at the reactant side is 1 while at the product side it is 2. This shows that the equation is not balanced.
The unbalanced chemical equation is [tex]\boxed{2.{\text{ Sr}} + {{\text{O}}_2} \to {\text{SrO}}}[/tex].
Further explanation:
Chemical reaction:
The chemical conversion of one set of substances into another is termed as chemical reaction. The substances that were originally present before the occurrence of chemical reaction are known as reactants whereas the substances that are formed once the reaction goes to completion are called products. Any chemical reaction involves the bond breaking between the reactants and new bond formations occur in products.
The chemical reaction in which equal number of atoms of the different elements is present in the reactant as well as in the product side is known as balanced chemical reaction. Law of mass and energy conservation are followed by each and every balanced equation.
1. [tex]{\text{C}} + {{\text{O}}_2} \to {\text{C}}{{\text{O}}_{\text{2}}}[/tex]
On the reactant side,
Number of carbon atoms is 1 while that of oxygen atoms is 2.
On the product side,
Number of carbon atoms is 1 while that of oxygen atom is 2.
The number of atoms of each type is the same on both sides of the reaction and therefore this reaction is balanced.
2. [tex]{\text{Sr}} + {{\text{O}}_2} \to {\text{2SrO}}[/tex]
On the reactant side,
Number of strontium atoms is 1 while that of oxygen atoms is 2.
On the product side,
Number of strontium atoms is 2 while that of oxygen atom is 2.
The number of strontium atoms on both sides of the reaction is not same and therefore this reaction is unbalanced.
3. [tex]{\text{6}}{{\text{H}}_2} + 3{{\text{O}}_2} \to {\text{6}}{{\text{H}}_2}{\text{O}}[/tex]
On the reactant side,
Number of hydrogen atoms is 12 while that of oxygen atoms is 6.
On the product side,
Number of carbon atoms is 12 while that of oxygen atom is 6.
The number of atoms of each type is the same on both sides of the reaction and therefore this reaction is balanced.
4. [tex]{{\text{H}}_2} + {{\text{H}}_2} + {{\text{O}}_2} \to {{\text{H}}_2}{\text{O}} + {{\text{H}}_2}{\text{O}}[/tex]
On the reactant side,
Number of hydrogen atoms is 4 while that of oxygen atoms is 2.
On the product side,
Number of hydrogen atoms is 4 while that of oxygen atom is 2.
The number of atoms of each type is the same on both sides of the reaction and therefore this reaction is balanced.
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Chemical reactions and equations
Keywords: balanced, unbalanced, Sr, O2, H2, H2O, C, reaction, conversion, reactants, products, SrO, CO2.
Quarks are thought to be the building blocks of protons. Which was most affected by the discovery of the quark?
A the estimated mass of a proton
B the observation that protons have a +1 charge
C the view that the atom cannot be broken down further than protons
D the theory that the nucleus of an atom contains protons and neutrons
Answer:
C. the view that the atom cannot be broken down further than protons
Explanation:
Atom is considered as the smallest unit of matter. An atom contains protons and neutrons in the nucleus and electrons orbiting the nucleus in fixed energy shells.
It was thought that atom cannot be broken down further than these particles until quarks were discovered. A proton contains three quarks- 2 up quarks and 1 down quark.
A student added 25.0 uL of a solution of magnesium chloride to a microcentrifuge tube along with a color changing indicator, and titrated with 1.00 x 10−2 M EDTA to the endpoint. The color change occurred at 21.7 uL. What was the [Mg₂+]?
An atom is
a. the smallest unit of matter that maintains its chemical identity.
b. always made of carbon.
c. smaller than an electron.
d. the smallest unit of a compound.
Answer:
a. the smallest unit of matter that maintains its chemical identity.
Explanation:
A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating?
Answer:
Solubility.
Explanation:
When a chemist is dissolving crystal of unknown substance it means the chemist is checking the solubility of substance in the water.
As the chemist not measuring the temperature so he is not determining anything related to enthalpy, boiling point, melting point etc.
When we dissolve a particular amount of substance (to form saturated solution) in a particular volume of solvent it means we are checking it solubility.
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms? Their positive charge is located in a small region that is called the nucleus. Their negative charge is located in small particles that are called electrons. Their nucleus makes up the majority of the volume of the atom.
Their electrons are floating in a sea of positive charges.
Ernest Rutherford's gold foil experiment discovered that atoms have a dense central nucleus with positive charge, surrounded by low-mass electrons in mostly empty space, leading to the nuclear model of the atom.
Ernest Rutherford's gold foil experiment demonstrated that atoms have a small, dense nucleus where most of the mass and the positive charge is concentrated. This experiment, which bombarded a thin sheet of gold with alpha particles, showed that while most of these alpha particles passed through the gold foil, a small fraction were deflected, and an even smaller number bounced back. This was a result of the alpha particles colliding with something dense and positively charged, leading Rutherford to propose the nuclear model of the atom. This model shows that the majority of the atom is empty space and that the negatively charged electrons orbit this central nucleus.
Rutherford's findings refuted the then-prevailing Thomson model, also known as the plum pudding model, which imagined electrons embedded within a positively charged 'paste' that filled the entire volume of the atom. Instead, his results indicated that the nucleus of the atom is tiny in volume but contains the bulk of the atom's mass and is surrounded by low-mass electrons moving through largely empty space.
Persamaan setara pada reaksi besi dengan asam klorida membentuk besi (II) klorida dan gas hidrogen
Iron reacts with hydrochloric acid to form Iron II Chloride and hydrogen gas. This is a single displacement reaction common in chemistry. Hess's Law can be employed to understand the energy changes in the reaction.
Explanation:The question refers to the chemical reaction of iron (Fe) with hydrochloric acid (HCl) to form Iron (II) Chloride (FeCl2) and hydrogen gas (H2). The balanced chemical equation for this reaction is: Fe + 2HCl -> FeCl2 + H2.
This is an example of a single displacement or substitution reaction, where element (iron) reacts with a compound (hydrochloric acid) to form a new compound (Iron II Chloride) and another element (hydrogen gas). Such reactions are common in Chemistry and understanding them helps comprehend how different substances interact. Hess's Law can also be applied here to understand the energy changes that occur during this reaction.
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A uranium atom has 92 protons in its nucleus. how many electrons does it have?
Which of the following is an SI base unit for measuring length?
Explanation:
the answer is kelvin
TRUE or FALSE. The particles of a gas are packed closely together and don't have as much movement as the particles of a solid or liquid.
Putting a balloon in the freezer is one way to demonstrat what?
Which substance is a binary acid?
hydrochloric acid
phosphoric acid
nitrous acid
sulfuric acid
Hydrochloric acid is a binary acid, while the other options are not.
Explanation:Out of the given options, hydrochloric acid is a binary acid. A binary acid is an acid that consists of hydrogen and a nonmetallic element. Binary acids are compounds composed of hydrogen and a nonmetal and participate in various chemical reactions, including acid-base reactions. They are used in chemical analysis and titration processes and are also used in industrial processes, such as the production of semiconductors and cleaning agents.
Hydrochloric acid (HCl) is commonly used to adjust pH levels in pools and water treatment. In hydrochloric acid (HCl), hydrogen and chlorine form a compound. Other options like phosphoric acid, nitrous acid and sulfuric acid are not binary acids as they contain additional elements along with hydrogen.
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6. How is the number of neutrons in the nucleus of an atom calculated?
who first published the classification of the elements that is the basis of our periodic table today
Dmitri Mendeleev was the first to publish the classification of the elements that is the basis of our current Periodic Table, by grouping them in order of atomic weight and similar chemical properties in 1869.
Explanation:The classification of the elements that is the basis of our periodic table today was first published by Dmitri Mendeleev in 1869. Mendeleev's table, also known as the Mendeleev periodic table, was the first to order the elements by atomic weight and to group them based on their chemical properties. Mendeleev even left vacant spaces in his table for elements that he predicted would be discovered in the future. His predictions were remarkably accurate and gave rise to the systematic table we use today.
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Sea water is _____.
an acid
a base
a neutral
Answer:
A neutral
Explanation:
Because sea water is neutral
Answer:
a neutral
Explanation:
Another important chemical property of water is its neutral pH. Pure water has pH value of 7. It is neither acidic nor basic. Living organisms cannot survive in highly acidic or basic environments.
what type of bond dose a dimand have?
Phase changes are chemical changes.
True
False ...?
A 8.048 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.00 grams of CO2 and 3.684 grams of H2O are produced.
In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
The empirical formula is C2H3O2, and the molecular formula is C6H9O6.
To determine the empirical formula and the molecular formula of an organic compound from combustion analysis, follow these steps:
Convert the mass of CO2 and H2O to moles by dividing by their molar masses (44.01 g/mol for CO2 and 18.015 g/mol for H2O).Calculate the moles of C in CO2 and the moles of H in H2O (each mole of CO2 contains one mole of C, and each mole of H2O contains two moles of H).Convert these moles to grams of C and H.Subtract the mass of C and H from the original compound mass to find the mass of O.Convert the mass of O to moles by dividing by its molar mass (16.00 g/mol).Determine the simplest whole number ratio of C:H:O to find the empirical formula.Divide the molar mass of the compound by the mass of the empirical formula to find the ratio between the molecular and empirical formulas.Multiply the subscripts in the empirical formula by this ratio to determine the molecular formula.Using the provided data:
The moles of C in CO2: 12.00 g / 44.01 g/mol = 0.273 moles of C.The moles of H in H2O: 3.684 g / 18.015 g/mol = 0.2046 moles of H2, which equals 2 x 0.2046 = 0.4092 moles of H.The grams of C: 0.273 moles x 12.01 g/mol = 3.278 g of C.The grams of H: 0.4092 moles x 1.008 g/mol = 0.4125 g of H.The grams of O: 8.048 g - (3.278 g + 0.4125 g) = 4.3575 g of O.The moles of O: 4.3575 g / 16.00 g/mol = 0.2723 moles of O.C:H:O ratio is 0.273:0.4092:0.2723 which simplifies approximately to 1:1.5:1. This gives us the empirical formula CH1.5O.To get integers, we multiply each subscript by 2 to get C2H3O2 as the empirical formula.The molar mass of C2H3O2 is 43.05 g/mol. The molecular formula contains 118.1 g/mol / 43.05 g/mol = ~2.74 or approximately 3 times the empirical formula units, which gives us C6H9O6 as the molecular formula.. Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?
Na + Br2 —> NaBr
2Na + Br2 —> NaBr
Na + Br2 —> 2NaBr
2Na + Br2 —> 2NaBr
Answer: The correct option is:
[tex]2Na+Br_2\rightarrow 2NaBr[/tex]
Explanation:
In balanced chemical equation , mass of the reactants is always equal to the mass of the products.
[tex]2Na+Br_2\rightarrow 2NaBr[/tex]
This is the balanced equation because on both sides number of sodium and bromine atoms are same.
On the reactant side there are two sodium atoms and two bromine atoms
On the product side there are also two sodium atoms and two bromine atoms in NaBr.
Mass of reactants (here 2Na and [tex]Br_2[/tex])= Mass of products(here 2NaBr)
2(23u) + 2(79.9u) = 2(23u + 79.9u) = 205 u
The correct balanced chemical equation for the synthesis of NaBr from Na and Br₂ is: 2Na + Br₂ → 2NaBr. Therefore, the correct option is option C.
A balanced chemical equation is a representation of a chemical reaction using chemical formulas and symbols. In a balanced equation, the number of atoms of each element is the same on both sides of the equation. This means that the total mass and the total charge remain constant during the chemical reaction.
The balanced equation provides important information about the reactants and products involved in the reaction, as well as the stoichiometry (the molar ratio) between them. It follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.
Thus, the ideal selection is option C.
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Will magnesium oxidize zinc?
Final answer:
Magnesium has a greater tendency to be oxidized than zinc, so magnesium will not oxidize zinc. The activity series explains that magnesium is more active and readily loses electrons compared to zinc, leading to its oxidation in the presence of zinc ions.
Explanation:
No, magnesium will not oxidize zinc. Instead, the opposite is true because magnesium has a greater tendency to be oxidized than zinc, according to the activity series. The activity series ranks metals based on their ease of oxidation, with the metals at the top being the most active and hence more likely to lose electrons and be oxidized. Alkali metals, alkaline earth metals, and aluminum are at the top of this series, while metals like copper, gold, and silver are at the bottom. Since magnesium is higher in the activity series than zinc, it is more likely that magnesium will give up electrons to zinc ions, reducing the zinc ions to zinc metal and oxidizing the magnesium to magnesium ions.
Magnesium, when exposed to air, forms a passivation layer of magnesium oxycarbonate due to the reaction with carbon dioxide, which decreases its reactivity after initial exposure, but this does not affect its position in the activity series relative to zinc.
Using the example provided,
Mg(s) + Zn²⁻ (aq) → Mg²⁻(aq) + Zn(s)
This demonstrates that magnesium, not zinc, will be oxidized in a reaction between magnesium metal and zinc ions.
Magnesium has a greater tendency to oxidize compared to zinc, which can be understood with the help of the activity series of metals. In a reaction between magnesium and zinc, magnesium will be oxidized, while zinc will be reduced.
Explanation:Will magnesium oxidize zinc? To answer this question, we need to refer to the activity series of metals, which is a list that ranks metals according to their relative reactivity. Specifically, it orders metals by their tendency to be oxidized. Magnesium is more reactive than zinc, according to the activity series, and thus has a greater tendency to be oxidized.
Looking at the pairing of metals, when magnesium (Mg) and zinc (Zn) are considered, the reaction is as follows:
Mg(s) + Zn²⁺(aq) → Mg²⁺(aq) + Zn(s)
This equation indicates that magnesium metal will react with zinc ions, leading to the oxidation of magnesium and the reduction of zinc. Therefore, in a reaction where both magnesium and zinc are present, magnesium will be the one to oxidize, not zinc. This is because zinc is less active and has a lesser tendency to lose electrons compared to magnesium.
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
The empirical formula for the compound is KNO3.
What is the empirical formula?
We first came up with two significant sorts of chemical formulas: molecular formula and empirical formula, by calculating the masses of all the constituent atoms that combine to create a molecule.
While the molecular formula provides the precise quantity of each unique element present in a molecule, the empirical formula of a compound provides the simplest ratio of the number of various atoms present. It is an empirical formula if it has been simplified. The empirical formula is multiplied by the widely used molecular formula.
The overall correlation between the empirical formula and the molecular formula is
Molecular Formula = n × Empirical Formula
Thus,
K : 38.7 g / 39.1 g/mol = 0.99N : 13.9 g / 14.0 g/mol = 0.99O : 47.4 g / 16.0 g/mol = 2.96
Dividing by the smallest:
K : 0.99 / 0.99 = 1N : 0.99 / 0.99 = 1O : 2.96 / 0.99 = 3
Therefore the formula for the compound is KNO3.
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which of the following is a product formed whrb NO2 and H2O react together A O2 B HNO3 C H2 D P(OH)2
Answer : The correct option is, (B) [tex]HNO_3[/tex]
Explanation :
Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.
The balanced chemical reaction will be,
[tex]3NO_2+H_2O\rightarrow 2HNO_3+NO[/tex]
By the stoichiometry, we can say that 2 moles of [tex]NO_2[/tex] react with 1 mole of [tex]H_2O[/tex] to give 1 moles of [tex]HNO_3[/tex] and 1 mole of [tex]NO[/tex].
In this reaction, [tex]NO_2[/tex] and [tex]H_2O[/tex] are the reactants and [tex]HNO_3[/tex] and [tex]NO[/tex] are the products.
Hence, the correct option is, (B) [tex]HNO_3[/tex]
Analyze the properties of a sodium atom and a sodium ion. What are the differences in mass, stability, and reactivity that are caused due to the differences between the sodium atom and sodium ion? ...?