Answer:
when silver articles exposed to air silver racts with Sulphur present in the atmosphere and form a black layer of silver sulphide on the surface. copper articles get tarnished by reacting with air and water. due to this, a layer is formed over copper vessels.
Explanation: When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases.
BrO3- (aq) + NO2(aq) → Br-(aq) + NO3-(aq) Balance this reaction in acidic conditions?
Answer:
BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O
Explanation:
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 1 Br, 5 O and 1 N
Right side: 1 Br, 3 O and 1 N
If the reaction occurs in an acidic medium:
Each excess oxygen atom is balanced by adding a molecule of water to the other side of the reaction. Hydrogens are balanced by adding protons (H⁺) on the opposite side to the water molecules.So, balancing the oxygen:
BrO₃⁻ (aq) + NO₂(aq) → Br⁻(aq) + NO₃⁻ + 2 H₂O
Left side: 1 Br, 5 O and 1 N
Right side: 1 Br, 5 O, 1 N and 4 H
Then, balancing the hydrogens:
BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O
Left side: 1 Br, 5 O, 1 N and 4 H
Right side: 1 Br, 5 O, 1 N and 4 H
You can see that you have the same amount on each side of the reaction. So the reaction is balanced.
(02.05 HC)
A scientist observed a certain type of a particular bacteria growing in a substance that had a 1,000 times higher amount of the antibiotic that targets this bacteria. Using complete
sentences, justify the observation based on your knowledge of natural selection
Answer:
Para otros usos de este término, véase Resistencia.
La resistencia antibiótica es la capacidad de un microorganismo para resistir los efectos de un antibiótico. La resistencia se produce naturalmente por selección natural a través de mutaciones producidas por azar. El antibiótico, al entrar en contacto con una población bacteriana, permite solo la proliferación de aquellas bacterias que presentan aquella mutación natural que anula la acción del antibiótico. Una vez que se genera la información genética, las bacterias pueden transmitir los nuevos genes a través de transferencia horizontal (entre individuos) por intercambio de plásmidos; o igualmente producto de una conversión lisogénica. Si una bacteria porta varios genes de resistencia, se le denomina multirresistente o, informalmente, superbacteria.
what is the the chemical name for hydroden and oxygen
Answer:
hydrogen peroxide is a chemical name for hydrogen and oxygen
What type of solid consists of positive metal cations surrounded by valence electrons that
are donated by the metal atoms and belong to the solid as a whole?
Select one:
O a. ionic
O b. covalent network
O c. metallic
O d. covalent molecular
Which of the following pollutants could be reduced through proper maintenance and area ventilation to improve human health?
Asbestos
Chimney soot
Formaldehyde
Natural pesticides
Answer:
Chimney soot
Explanation:
The periodicity of chimney used in homes is very highly harmful to human health. If proper maintenance and cleanliness and ventilation are taken care of on such organic compounds, it can also control human health. Carbon compounds form chimneys are highly harmful to human health if timber or coal-fired black chimney soot can be disposed of from time to time and with constant maintenance we can control pollution.A compound containing oxygen and group 16 and/or group 17 elements contains one of the following elements. The compound dissolves in water. Which element does
the compound contain?
A. Magnesium
B. Potassium
C. Barium
D. Strontium
Explanation:
pottassium its one of covalent bond
Which of the following shows how rate depends on concentrations of reactants?
Answer:
C
Explanation:
Rate = k(A)m(B)n
The correct option is C.
What are K , m and N in the rate law equation?
The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants.The exponents m and n are the reaction orders and are typically positive integers, though they can be fractions, negative, or zero.
What do you mean by concentrations of reactants?
The increase in the concentration of reactants, the rate of reaction increases. Ions and molecules interact to form a new compound on increasing the concentration.
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A solution of Cuso, is labelled 1.743 M. How much Cuso, in grams, must be used to make
1.4957 liter of solution?
Select one:
O a. 416.1
Ob. 0.007301
O c. 166.6
Od. 129.2
Answer:
Option A. 416.1 g.
Explanation:
Data obtained from the question include the following:
Molarity = 1.743 M
Volume = 1.4957 L
Mass of CuSO4 =..?
Next, we shall determine mole of CuSO4 present in the solution.
This is illustrated below:
Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
Molarity = mole /Volume
With the above formula, we can obtain the mole CuSO4 present in the solution as follow:
Molarity = 1.743 M
Volume = 1.4957 L
Mole of CuSO4 =..?
Molarity = mole /Volume
1.743 = mole of CuSO4 /1.4957
Cross multiply
Mole of CuSO4 = 1.743 x 1.4957
Mole of CuSO4 = 2.607 moles
Finally, we shall convert 2.607 moles of CuSO4 to grams.
This can be obtained as follow:
Molar mass of CuSO4 = 63.55 + 32.06 + (16x4) = 159.61 g/m
Mole of CuSO4 = 2.607 moles
Mass of CuSO4 =..?
Mole = mass /molar mass
2.607 = mass of CuSO4 /159.61
Cross multiply
Mass of CuSO4 = 2.607 x 159.61
Mass of CuSO4 = 416.1 g
Therefore, 416.1 g of CuSO4 is needed to prepare the solution.
In the redox reaction AgNO3 + Na → NaNO3 + Ag, which element has been
reduced?
The element that has been reduced in the redox reaction [tex]AgNO_3 + Na NaNO_3 + Ag[/tex] is silver (Ag). A redox (reduction-oxidation) reaction involves the reduction of one element by the gain of electrons and the oxidation of another element by the loss of electrons.
When sodium (Na) loses one electron to generate [tex]NaNO_3[/tex] in this reaction, sodium changes from its neutral state (with a zero oxidation number) to a positive oxidation state (+1). On the other hand, when silver (Ag) in AgNO3 gets one electron to create Ag, it moves from a +1 oxidation state to a neutral state (with zero oxidation number).
Silver is the element that undergoes reduction in this process because reduction entails a gain of electrons, reducing it from its +1 oxidation state to its neutral state.
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Tartaric acid, C4H6O6, has the first ionization constant with the value: Ka1 = 9.20 × 10-4. Calculate the value of pKb for the conjugate base of tartaric acid. 10.963 3.036 1.087 x 10-11 9.20 x 10-4
Answer:
pKb = 10.96
Explanation:
Tartaric acid is a dyprotic acid. It reacts to water like this:
H₂Tart + H₂O ⇄ H₃O⁺ + HTart⁻ Ka1
HTart⁻ + H₂O ⇄ H₃O⁺ + Tart⁻² Ka2
When we anaylse the base, we have
Tart⁻² + H₂O ⇄ OH⁻ + HTart⁻ Kb1
HTart⁻ + H₂O ⇄ OH⁻ + H₂Tart Kb2
Remember that Ka1 . Kb2 = Kw, plus pKa1 + pKb2 = 14
Kb2 = Kw / Ka1 → 1×10⁻¹⁴ / 9.20×10⁻⁴ = 1.08×10⁻¹¹
so pKb = - log Kb2 → - log 1.08×10⁻¹¹ = 10.96
37.2 liters of a gas has a pressure of 362.43 kPa at 46.5 °C. If the pressure increases to
693.9 kPa and the temperature to 149.2 °C, what would be the new volume of the gas?
Select one:
Oa. 25.7
Ob. 62.3
Oc. 54
O d. 25.672
Answer:
Option A. 25.7 L.
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial volume (V1) = 37.2 L
Initial pressure (P1) = 362.43 kPa
Initial temperature (T1) = 46.5 °C
Final pressure (P2) = 693.9 kPa
Final temperature (T2) = 149.2 °C
Final volume (V2) =.?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This can be achieved as shown below:
Temperature (K) = Temperature (°C) + 273
T (K) = T (°C) + 273
Initial temperature (T1) = 46.5 °C
Initial temperature (T1) = 46.5 °C + 273 = 319.5 K.
Final temperature (T2) = 149.2 °C
Final temperature (T2) = 149.2 °C + 273 = 422.2 K.
Step 3:
Determination of the new volume.
This can be obtained by using the general gas equation as shown below:
Initial volume (V1) = 37.2 L
Initial pressure (P1) = 362.43 kPa
Initial temperature (T1) = 319.5 K
Final pressure (P2) = 693.9 kPa
Final temperature (T2) = 422.2 K
Final volume (V2) =.?
P1V1/T1 = P2V2/T2
362.43×37.2/319.5 = 693.9 × V2/422.2
Cross multiply
319.5×693.9×V2 = 362.43×37.2×422.2
Divide both side by 319.5 × 693.9
V2 = (362.43×37.2×422.2)/(319.5×693.9)
V2 = 25.7 L
Therefore, the new volume is 25.7 L.
For the reaction 2KClO3 - 2KCI+ 302 how many moles of potassium chlorate are
required to produce 107.9 g of oxygen?
Select one:
O a. 2.26
Ob. 3450
O c. 1150
Od. 6.74
Answer:
the answer will be Oa. 2.26
A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true? The rate of freezing is equal to the rate of melting. The rate of freezing is greater than the rate of melting. The amount of ice is greater than the amount of water. The amount of ice is equal to the amount of water.
At dynamic equilibrium, the concentration of ice and water has been equal. Thus, option D is correct.
The equilibrium state can be given as the condition when the reactant and the product in the chemical reaction have been in equal amount.
In the condition when the water has bee kept in the freezer, the water will condense at the freezing temperature and will be converted to ice. The water there has been the reactant while the ice has been the product.
According to the law of equilibrium, at the equilibrium there has been equal concentration of reactant and products. Thus, at dynamic equilibrium, the concentration of ice and water has been equal. Thus, option D is correct.
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The table below gives the numbers of protons, electrons, and neutrons in four atoms.
Atom
11
2
Number of protons
39
40
|39
40
Number of electrons
39
40
39
40
Number of neutrons
52
50
154
51
3
14
Based on the information that is given, which atom in the table has the highest mass?
O 1
2
3
Answer:
The atom with the highest mass with 139 protons and 154 neutrons, is atom 3
Explanation:
The information given are;
The number of protons, p, the number of electrons, e, and the number of neutrons, n, we have;
p, e, n,
39, 39, 52
40, 40 50
139, 39 154
40, 39 51
Based on the information that the mass of the proton = 1.67262 × 10⁻²⁷ kg
The mass of the electron = 1.094 × 10⁻³¹ kg
the mass of the neutron = 1.674927471 × 10⁻²⁷ kg
We have that the atom with the most number of neutron and proton which is atom 3, has the highest mass
we have
37.2 liters of a gas has a pressure of 362.43 kPa at 46.5 °C. If the pressure increases to
693.9 kPa and the temperature to 149.2°C, what would be the new volume of the gas?
Select one:
O a. 25.7
O b. 62.3
O c. 54
O d. 25.672
Answer:25.7
Explanation:
According to this equation, how much P4O10 can be produced from 8.32 g of phosphorus? 4 P + 5 O2 → P4O10
Answer:
38.28
Explanation:
4×8.32(p)=33.28 33.28+5=38.28
Considering the reaction stoichiometry, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.
The balanced reaction is:
4 P + 5 O₂ → P₄O₁₀
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
P: 4 moles O₂: 5 moles P₄O₁₀: 1 molesThe molar mass of each element or compound is:
P: 31 g/moleO₂: 32 g/moleP₄O₁₀: 284 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
P: 4 moles× 31 g/mole= 124 gramsO₂: 5 moles× 32 g/mole= 160 gramsP₄O₁₀: 1 moles× 284 g/mole= 284 gramsThen you can apply the following rule of three: if by stoichiometry 124 grams of P produces 284 grams of P₄O₁₀, 8.32 grams of P produces how much mass of P₄O₁₀?
[tex]mass of P_{4} O_{10}=\frac{8.32 grams of Px284 grams of P_{4} O_{10}}{124 grams of P}[/tex]
mass of P₄O₁₀= 19.05 grams
Finally, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.
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Answer:
175.7 mL
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 223.6 mL
Initial temperature (T1) = 74.5 °C
Final temperature (T2) = stp = 273 K
Final volume (V2) =.?
Next, we shall convert celsius temperature to Kelvin temperature.
This is illustrated below:
Temperature (K) = Temperature (°C) + 273
T (K) = T (°C) + 273
Initial temperature (T1) = 74.5 °C
Initial temperature (T1) = 74.5 °C + 273 = 347.5 K
Finally, we shall determine the volume of the gas at standard temperature as follow:
Initial volume (V1) = 223.6 mL
Initial temperature (T1) = 347.5 K
Final temperature (T2) = stp = 273 K
Final volume (V2) =.?
V1/T1 = V2/T2
223.6/347.5 = V2/273
Cross multiply
347.5 x V2 = 223.6 x 273
Divide both side by 347.5
V2 = (223.6 x 273) /347.5
V2 = 175.7 mL
Therefore, the volume of the gas at standard temperature is 175.7 mL.
A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?
Explanation:
Photovoltaic means electricity from light
photo = light voltaic = electricity
SUNLIGHT is the answer
Hope this is correct
HAVE A GOOD DAY!
Describe one way in which each of the items you listed in Part 1 could be at least temporarily disrupted from equilibrium. Can you think of a way your body could respond to restore homeostasis after one of these disruptions? (3 points) Think about things that stress the body or do not supply the body's needs properly.
Answer:
Not enough exercise, not enough water, not a healthy diet. Consume fluids regularly during exercise, and drink 16 ounces of fluid for every pound lost during your workout.
Explanation:
Given the reaction: N2(9) +2O2(g) = 2NO2(9) The forward reaction is
endothermic. Determine which of the following changes would result in more
product being produced.
I. Increase NO2
II. Decrease O2
III. Add a catalyst
IV. Increase the temperature
V. Increase the pressure
A. IV and V
B. I and 11
C. II and IV
D. II, III, and V
Reset Selection
Which of the following statements is true?
A Question Progress A
A. Factors that affect the reaction rate can increase the speed of a reaction but not the
yield.
O
B. None of these
C. Catalysts are important to industry to increase product yields
D. A reaction can be sped up by reducing the surface area of solid reactants.
Reset Selection
Answer:
c
Explanation: c
The statement that is true from the following is catalysts are important to the industry to increase product yields. The correct option is C.
What is a catalyst?Catalysts are substances that speed up or increase the rate of reaction. The biological catalysts are enzymes. Enzymes are made up of proteins, and they are used in the reaction to increase the yield in less time. Catalyst does not mix with the process and after the reaction.
There are many chemical catalysts like nickel and iron. These catalysts are used in chemical and manufacturing processes. They impact, accelerate, and promote the reaction to get different yields.
Thus, the correct option is C. Catalysts are significant to industry to increase product yields.
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We say that salts will dissociate but acids will react with water. We say that acids will
None are correct
hydrate
ionize
crystallize
hydrolize
Answer:
ionize
Explanation:
Acids are chemical substances that lose/donate their hydrogen ion (H+) when they react with water. This property of acids is termed IONIZATION. In a chemical reaction involving acids and bases, acids release their proton or hydrogen ion (H+) in the presence of water solutions to form a conjugate base, which is usually an anion.
For example, in the chemical reaction;
HX + H20 -------> X- + H30+
HX is the acid because it loses its electron to water and forms the anion, X-, which is the conjugate base. Hence, it can be said that acid HX ionizes in water.
Which group in the periodic table contains the lightest ferromagnetic element?
A. Group 7
B. Group 8
C. Group 10
D. Group 9
Group 8 in the periodic table contains the lightest ferromagnetic element. Therefore, option B is correct.
What is ferromagnetic material?Ferromagnetism can be described as a property of certain materials that results in a large observed magnetic permeability and large magnetic coercivity to form a permanent magnet.
Ferromagnetic materials are metals attracted to a magnet, a consequence of large magnetic permeability. Magnetic permeability can be defined as the induced magnetization of a material because of the presence of an external magnetic field.
A steel plate can acquire a permanent magnetization, which depends not only on the strength of the applied field but varies greatly among ferromagnetic materials.
Ferromagnetism can be described as the strongest type and is responsible for the phenomenon of magnetism in magnets. Substances weakly to magnetic fields with 3 other types of magnetism which are paramagnetism, diamagnetism, and antiferromagnetism.
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Convert the pressure 525.4 torr to kPa.
Select one:
O a. 70.0
Ob. 3940
O c. 9.90
Od. 525
Answer:
Option A. 70.0 KPa.
Explanation:
Data obtained from the question include:
Pressure (torr) = 525.4 torr
Pressure (kPa) =?
The pressure expressed in torr can be converted kPa as shown below:
760 torr = 101.325 KPa
Therefore,
525.4 torr = (525.4 x 101.325) / 760 = 70.0 KPa.
Therefore, 525.4 torr is equivalent to 70.0 KPa.
Describe in general a process desert plants might need to carry out in order to maintain homeostasis. (4 points) All plants need water; think about how plants in an area without much water might be able to live.
Answer:
Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems.
Hope this helps.
Answer:
The person above me was right.
"Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems."
Explanation:
2SO2(g) + O2(g) ⟶ 2SO3(g), △H = -198 kJ What is the enthalpy change that occurs when 58.0 g SO2 reacts with excess oxygen in the above reaction?
Answer:
Enthalpy change = -98.6kJ
Explanation:
Based on the reaction:
2SO₂(g) + O₂(g) ⟶ 2SO₃(g), △H = -198 kJ
When 2 moles of SO₂ (Molar mass: 64.066g/mol) reacts with 1 mole of oxygen, enthalpy change is -198kJ
To know enthalpy change of 58.0g of SO₂ with excess oxygen we need to calculate moles of SO₂ thus:
58.0g SO₂ ₓ (1mol / 64.066g) = 0.905 moles SO₂
If 2 moles of SO₂ produce an enthalpy change of -198kJ, 0.905 moles SO₂ will produce:
0.905 moles SO₂ ₓ (-198kJ / 2 moles SO₂) =
Enthalpy change = -98.6kJ
Find the mass of 3.02 mol Cl2.
Answer in units of g.
Answer:
the answer is 70.906 g/mol
Explanation:
Answer:
214.12 g
Explanation:
mass = no. of moles x molar mass
molar mass of Cl2 = atomic mass of Cl x 2
= 35.453 x 2
=70.906
so the mass of 3.02 mol Cl2 = 3.02 x 70.906
=214.12 g
Attractive forces between molecules in a solid are
than bonds between atoms in a molecule.
A. stronger
B. the same as
C. weaker
D. much stronger
Answer:
A. stronger
Explanation:
Which metal can replace another metal in a reaction?
O A. A metal higher on the activity series list will replace one that is
lower.
B. A metal lower on the activity series list will replace one that is
higher
O c. Ametal on the activity series list will replace one that is not on the
list.
D. Any metal on the list can replace any other metal also on the list.
Answer:
O A. A metal higher on the activity series list will replace one that is
lower.
Answer:
A metal higher on the activity series list will replace one that is
lower.
Explanation:
the reaxtion between calcium and nitrogen to form calcium nitride is a redox reaction.
In terms of electrons, explain why calcium is the reducing agent.