Answer:
Um we need more information what animals
Explanation:
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
A student balanced the chemical equation Mg + O2 →MgO by writing Mg + O2 → MgO2. Was the equation balanced correctly? Explain your answer. If the equation was not balanced correctly, write the correctly balanced equation.
Explanation:
Charges on both magnesium and oxygen is 2. Though opposite in sign, they have equal charges so, both of them will be cancelled by each other.
As a result, formula of magnesium oxide is MgO and not [tex]MgO_{2}[/tex].
The student write the equation as [tex]Mg + O_2 \rightarrow MgO_2[/tex], it is not correct.
Therefore, given equation will be balanced as follows.
[tex]2Mg + O_{2} \rightarrow 2MgO[/tex]
Since, number of atoms on both reactant and product side are equal. Hence, this equation is completely balanced.
No, the equation [tex]Mg + O2 -- MgO2[/tex]is not balanced correctly. The correct balanced equation is
[tex]2Mg + O2 -- 2MgO.[/tex]
Explanation:A balanced chemical equation is a symbolic representation of a chemical reaction that ensures the conservation of mass and charge. It shows the reactants on the left side and the products on the right side, with coefficients indicating the relative quantities of substances involved to satisfy the law of conservation of matter.
The given chemical equation is not balanced correctly. To balance this equation, we need to ensure that there is an equal number of each element on both the reactant and product sides. In the unbalanced equation, there is one magnesium atom on the reactant side and two oxygen atoms on the product side. To balance it, we need to put a coefficient of 2 in front of MgO, resulting in the balanced equation: [tex]2Mg + O2 -- 2MgO.[/tex]
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Which of the following is an SI base unit for measuring length?
Explanation:
the answer is kelvin
The distance between the atoms of H−I is 1.61Å. What is the distance in meters?
what's the name for the phase change from solid to gas
what particles in an,atom determine an elements atomic number and identity?
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]
Phase changes are chemical changes.
True
False ...?
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:
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.
What is the oxidation number for ba??
Answer: +2
I finished the assignment.
Determine the number of neutrons in an atom of Rg-272.
Explanation:
Roentgenium is a radiactive element which is represented by symbol Rg. Atomic number of Rg is 111 and its atomic mass is 272.
It is known that atomic number is the number of protons present in an atom. Whereas atomic mass is the sum of total number of protons and neutrons present in an atom.
That is, Atomic mass = no. of protons + no. of neutrons
272 = 111 + no. of neutrons
no. of neutrons = 272 - 111
= 161
Thus, we can conclude that there are 161 neutrons present in Rg-272.
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.
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.
Since most sources of noise pollution are caused by essential machines, it is not possible to decrease the levels of sound.
True
False
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.
6. How is the number of neutrons in the nucleus of an atom calculated?
How many valence electrons do noble gases have?
1 or 2
2 or 8
2 or 3
8
Which is the electron configuration for bromine?
Electron configuration:
The arrangement of electrons in an atom by a superscript, in each sublevel is known as electron configuration. For example the d block elements have (n-1)d1-10 ns1-2 electronic configuration
The atomic number if bromine is 35 thus there are 35 electrons present which fill accorindg to the Hund’s rule and aufbau principle a follows:
Br-35 1s22s22p63s23p64s23d104p5
Or [Ar] 4s23d104p5
Predict the products of the following reaction: Ba+P The equation may not be correctly balanced. Express your answers as chemical formulas separated by a comma. If no reaction occurs, enter noreaction.
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.
when a wave hits a surface through which it cannot pass and bounces back it undergoes?
Putting a balloon in the freezer is one way to demonstrat what?
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+]?
. 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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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.
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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Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass
Answer:
It is Henry Moseley
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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