What element is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p4?
The element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 is Tin (Sn). This is found by adding up the electrons in each part of the configuration.
Explanation:The electron configuration provided, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4, represents the element Sn, or Tin in the periodic table. The configuration corresponds to the distribution of electrons among different energy levels (shells) and sub-levels in an atom. To identify the element, we add up the electrons represented by each part of the configuration (e.g., s2 implies 2 electrons, p6 implies 6 electrons etc.). We see that the total number of electrons is 50, which corresponds to the atomic number of Tin (Sn) in the periodic table.
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Compare and contrast the properties of acids and bases. include two similarties and two differences.
Acids and bases are similar in that they conduct electricity in aqueous solutions and both react to form salt and water. Their differences lie in taste, color changes in litmus paper, and pH values where acids have pH lower than 7 and bases have pH greater than 7.
Explanation:Acids and bases are both types of compounds that chemists often deal with. They are similar in that they both conduct electricity when in aqueous solution and they both react with each other to form salt and water, a reaction known as neutralization. However, they are also distinctly different. The first difference is that acids have a sour taste and can turn blue litmus paper red, while bases have a bitter taste and can turn red litmus paper blue. Additionally, acids tend to have a pH less than 7, whereas bases have a pH greater than 7.
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Which equation represents the reduction half-reaction for this redox equation?
Mg + CuSO4 MgSO4 + Cu
A. Cu Cu
B. Cu + 2e- Cu
C. Cu Cu + 2e-
D. Cu + 3e- Cu,
The oxidation number of Cu in CuSO₄ is +2 and 0 in Cu, the free elemental form. As the oxidation of Cu decreases from +2 to 0, we are looking at the reduction half-reaction for the given redox reaction:
Cu²⁺ + 2e⁻ → Cu
The correct answer is option B.
A ________ zone is the place where two lithospheric plates converge, one riding over the other. Most volcanoes on land occur parallel to the boundary between the two plates.
a.continental
b.convergent
c.subduction
d.volcanowhat fits in the blank?
The answer is C. Subduction
when you discuss calories in food you are talking about kilocalories (Kcal) which is the amount of heat necessary to raise 1000 mL of water by 1 degree Celsius which is approximately 4.18 kJ. compare the number of Kilocalories in one gram of tomatoes to the number of Kilocalories in one gram of corn chips
100 g of corn chips has 17.69 calories
1 g of corn chips has 17.69/100 or 0.1769 calories
Therefore, 1 g of tomatoes has 0.1769 x 10⁻³ kilocalories
100 g of corn chips has 518 calories
1 g of corn chips has 518/100 or 5.18 calories
Therefore, 1 g of corn chips has 5.18 x 10⁻³ kilocalories
How many moles of sodium acetate (nach3coo) must be added to 1.000 liter of a 0.500 m solution of acetic acid (ch3cooh) to produce a ph of 5.675? the ionization constant of acetic acid is 1.8 × 10−5 ?
ck(CH₃COOH) = 0,5 M.
V = 1 L.
Ka = 1,8·10⁻⁵.
pKa = -logKa = 4,75.
pH = 5,675.
Henderson–Hasselbalch equation: pH = pKa +
log(cs/ck).
5,675 = 4,75 + log(cs/ck).
log(cs/ck) = 5,675 - 4,75 = 0,925.
cs/ck = 10∧(0,925) = 8,4.
cs = 8,4 · 0,5 M = 4,2 M.
n(CH₃COONa) = 4,2 mol/L · 1 L = 4,2 mol.
Why do the number of atoms of each element have to be the same on both sides of the equation?
How many nitrogen-14 atoms does it take to equal the mass of three calcium-42 atoms?question 6 options:8.5793impossible to determine without additional information?
the answer is 9. took the test and got it correct
How do you balance this chemical equation?
barium chlorate --> barium chloride + oxygen
I'm really confused on this question because it contains some ionic compounds. How would you balance it? Thanks!,
To balance the equation for the decomposition of barium chlorate into barium chloride and oxygen, ensure that there are equal numbers of each atom on both sides of the equation. The balanced equation is 2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂.
To balance the chemical equation for the decomposition of barium chlorate into barium chloride and oxygen, we must ensure that the number of each type of atom is the same on both sides of the equation. The formula for barium chlorate is Ba(ClO₃)₂, barium chloride is BaCl₂, and oxygen is O₂ (since oxygen is a diatomic molecule).
The unbalanced equation is as follows:
Ba(ClO₃)₂ → BaCl₂ + O₂
To balance this equation:
First, balance the oxygen atoms. There are 6 oxygen atoms on the reactant side (from two chlorate ions) and 2 on the product side (one O₂ molecule). Place a coefficient of 3 in front of the O₂ to balance the oxygen atoms.Now, check the barium and chlorine atoms. Each side has one barium atom and two chlorine atoms, so they are already balanced.The balanced equation is:
2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂
Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.
Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.
Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.
Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.
Which statement provides the best assessment of his tests?
Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.
Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.
Answer:
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
Explanation:
1) In test 1 we are dissolving sodium bicarbonate and here there is no chemical change in the property of sodium bicarbonate if it dissolved so it is a pure physical process.
2) In test 2 we are reacting sodium bicarbonate with vinegar (acetic acid).
The reaction is:
[tex]NaHCO_{3}+CH_{3}COOH--->CH_{3}COONa+H_{2}O+CO_{2}[/tex]
Due to formation of carbon dioxide it fizzes. Thus this is a chemical property of sodium bicarbonate to acts as base.
3) In test 3, we are heating and testing the melting point of sodium bicarbonate, which is again a physical property.
How many grams are in .98 mols of C6H12O6 (*round to the nearest hundredth and include the unit "g C6H12O6" after your number)
Which statement describes the periodic law?
Metals are both good conductors of heat and electricity.
Atomic masses always increase across a period.
Nonmetals are of the most reactive elements.
Elements in the same group have similar chemical properties.
elements is the same group have similar chemical properties
How many grams of ch3oh must be added to water to prepare 325 ml of a solution that is 4.50 mch3oh?
Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction? hydrogen, oxygen, and carbon oxygen, solar energy, and water carbon dioxide, solar energy, and oxygen carbon dioxide, water, and solar energy
Photosynthesis is a chemical process used by plants where solar energy is used to transform carbon dioxide and water into carbohydrates and oxygen.
What is photosynthesis?It is the biochemical process by which plants convert inorganic matter (carbon dioxide and water) into organic matter (sugars), taking advantage of energy from sunlight.
This process constitutes one of the most important biochemical mechanisms on the planet since it involves the manufacture of organic nutrients that store light energy from the Sun.
Therefore, we can conclude that photosynthesis is the process carried out by plants to transform inorganic matter (Carbon dioxide, water and solar energy) into organic substances.
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Two or more atoms of different elements covalently bonded together are referred to as __________.
The volume of a gas is reduced from 4 l to 0.5 l while the temperature is held constant. what does the pressure of the gas do?
The pressure of the gas increases when its volume is reduced from 4 L to 0.5 L at constant temperature, according to Boyle's Law, which dictates an inverse relationship between volume and pressure for a given amount of gas.
When the volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant, according to Boyle's Law, the pressure of the gas increases. Boyle's Law states that at constant temperature, the volume of a fixed number of moles of a gas is inversely proportional to the pressure applied to it. This means that if you decrease the volume of the gas, the pressure must increase to compensate, assuming the amount of gas does not change.
Therefore, in this case where the volume decreases by a factor of 8 (from 4 L to 0.5 L), the pressure must increase by the same factor, assuming that no gas escapes and the temperature remains constant. It's important to note that these principles assume ideal gas behavior and may not perfectly model real gases under all conditions.
Calculate ΔH∘ in kilojoules for the reaction of ammonia (ΔH∘f=−46.1 kJ/mol) with O2 to yield nitric oxide NO (ΔH∘f=91.3 kJ/mol) and H2O(g) (ΔH∘f=−241.8 kJ/mol), a step in the Ostwald process for the commercial production of nitric acid.,
Final answer:
The standard enthalpy change (ΔH°) for the reaction of ammonia with O2 to yield nitric oxide and H2O(g) is calculated using standard enthalpies of formation and is found to be -633.2 kJ.
Explanation:
To calculate the standard enthalpy change (ΔH°) for the reaction of ammonia (NH3) with O2 to yield nitric oxide (NO) and H2O(g), we can use the standard enthalpies of formation (ΔH°f) for the reactants and products. Unfortunately, the provided information contains several elements that are not relevant to this question. Let us use the correct ΔH°f values to find the ΔH° for this reaction. Assuming we have balanced the equation and it is:
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
The formula to calculate ΔH° is:
ΔH° = [∑ (ΔH°f products) × (moles of product)] - [∑ (ΔH°f reactants) × (moles of reactant)]
Using the values given for ΔH°f:
ΔH°f NH3 = -46.1 kJ/mol
ΔH°f NO = 91.3 kJ/mol
ΔH°f H2O(g) = -241.8 kJ/mol
For the reaction:
ΔH° = [4×91.3 kJ/mol + 6×(-241.8 kJ/mol)] - [4×(-46.1 kJ/mol) + 5×0 kJ/mol]
ΔH° = (365.2 kJ - (-1448.8 kJ)) - (-184.4 kJ + 0 kJ)
ΔH° = -817.6 kJ + 184.4 kJ
ΔH° = -633.2 kJ
Therefore, the standard enthalpy change for the reaction is -633.2 kJ.
Which product besides radiation do radioactive atoms give off when they decay?
A.
heat energy
B.
poisonous gases
C.
ridge pushes
D.
p waves
The radiations are released in the radioactive decay along with the heat energy. Thus, option A is correct.
What are radioactive atoms?The radioactive atoms are given as the one that has the presence of unstable nuclei. The unstable nuclei have been giving off radiations that form them to attain stability.
The radioactive atoms have been emitting the radiations from the nucleus to become stable, and the nuclear or the radioactive radiations from the radioactive decay.
The decay of the radioactive elements releases the radiations such as alpha, beta, gamma, and other radiations. The decay along with the release of the radiation releases energy.
Therefore, in radioactive decay, the atoms along with the radiations release heat energy. Thus, option A is correct.
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A force has to push the bug forward. Identify this force. How does the bug produce it?
An isotope contains 56 protons, 54 electrons, and 74 neutrons. What is the identity of the isotope?
Answer:
The element will be represented as : [tex]Ba_{56}^{130}[/tex]
Explanation:
The identity of an element (isotope) is with its atomic number.
The atomic number is the number of protons in the element.
Irrespective of the number of electrons / neutrons the atomic number will be equal to the number of protons only.
atomic number of the isotope is 56.
The element with 56 atomic number is Barium
The mass number of Barium = protons + neutrons = 56 + 74 = 130
The element will be represented as : [tex]Ba_{56}^{130}[/tex]
Where do the OH- ions go as additional acid is added?
1. they evaporate.
2. They combine with excess H+ ions to form more water.
3. They remain in solution at the same concentration.
4. They remain in solution but change concentration.,
Answer:
A: They evaporate
Explanation:
Where do the OH- ions go as additional acid is added? They evaporate. They combine with excess H+ ions to form more water. They remain in the solution at the same concentration.
What is the term for a type of reaction in which an acid and a base react to produce a salt and water?
URGENT
1. An igneous rock that forms from long, slow cooling is characterized by
A: no crystallization
B: microscopic crystals
C: large, well-defined crystals
Question 2.2. Igneous rocks form when
A: collected sediments accumulate over time
B: extreme heat and pressure change a pre-existing rock
C: magma cools and solidifies
Question 3.3. An igneous rock displays coarse-sized grains that can easily be seen with the naked eyes. The rock is most likely
A: extrusive
B: intrusive
C: volcanic,
A species that changes the rate of a reaction but is neither consumed nor changed is
A. A catalyst.
B. An activated complex.
C. An intermediate.
D. A reactant.
A. A catalyst!!!
Hope it Helps!!!
What is the molar mass of BF3
Please use the below balanced equation to answer this question. 2H2(g) + O2(g) -> 2H2O(l) How many grams of water will be produced if I have 83.4 liters of oxygen gas at STP?
A) 48.65 grams H2O
B) 65.78 grams H2O
C) 85.71 grams H2O
D) 134.18 grams H2O
Sodium ions are present in relatively small concentrations compared to other extracellular cations true or false
The answer is false.
Within the extracellular fluid (ECF), the major cation is sodium (Na⁺) while the major cation in the intracellular fluid is potassium (K⁺). Sodium-potassium pump, is a solute pump that pumps three sodium ions out of the cell in exchange for two potassium ions pumped in the cell, both against their concentration gradients.These electrolytes play an important role in maintaining homeostasis. The ECF, in particular the interstitial fluid, is surrounding all of the cells in the body and therefore is crucial for their normal functions. The ECF is maintained by a number of homeostatic mechanisms including regulation of sodium concentration.
Potassium, calcium (Ca²⁺) and magnesium (Mg²⁺)What is the value of ∆G in a spontaneous reaction?
less than 0
greater than 0
equal to 0
equal to 1
#1: Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of the solution should she use?
A. 2.9 L
B. 5.8 L
C. 0.58 L
D. 0.29 L
***my answer: D. 0.29 L
is that right? @chmvijay :),
Answer:
D. 0.29 L
Explanation:
To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :
1.25 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]122.5 g/L
So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.
Finally we divide 36 grams by the concentration:
[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L
So your answer was correct, it is option D.
#1: Lemon juice is a weak acid. It has a [H+] of 5.0 × 10^-2 M. What is the pH of lemon juice?
A. 1.0
B. 1.3
C. 5.0
D. 7.5
***my answer: B. 1.3
is that right?,