Please Help!!!! D:
A student runs tests on an unknown substance and discovers the following properties. What other property does this element most likely have?
A highly reactive
B low electronegativity
C has many isotopes
D not found pure in nature
Answers
The unknown substance most likely has property not found pure in nature.(D)
Since the substance has properties A (highly reactive) and B (low electronegativity), it's likely that it readily forms compounds with other elements, making it difficult to find in its pure form.
Highly reactive elements, such as alkali metals or halogens, are typically not found in nature in their pure state because they readily react with other elements to form stable compounds. Property C (has many isotopes) doesn't directly influence the substance's reactivity or occurrence in nature.(D)
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Related Questions
A gas sample has a volume of 126ml at 58.0∘c. what is the volume of the gas at 118∘c?
Answers
A gas sample has a volume of 126ml at 58.0°C then the volume of the gas at 118°C is 148.8 ml .
Calculation ,
Formula used : \(V_{1} /V_{2} =T_{1} /T_{2}\)
Where , V is volume and T is temperature
Given initial Volume of gas sample \(V_{1}\) = 126 ml
Final volume of gas sample \(V_{2}\) = ?
Initial temperature of gas sample \(T_{1}\) = 58.0°C = 58.0 + 273 = 331 K
Final temperature of gas sample \(T_{2}\) = 118°C = 118 + 273 = 391 K
Putting the value of initial volume , Initial temperature and Final temperature in equation ( i ) we get
126ml / \(V_{2}\) = 331 K/391 K
\(V_{2}\) = 126ml × 391 K/ 331 K = 148.8 ml = 0.148 L
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CAN YOU EXPLAIN?
Which structures distinguish cells in multicellular plants and
animals from those of unicellular organisms, and why are
cells important for identifying organs and their functions?
Answers
Answer:
Explanation:
Outer skin cells form flattened stacks that protect the body from the environment. Muscle cells are slender fibers that bundle together for muscle contraction. The cells of multicellular organisms may also look different according to the organelles needed inside of the cell.
Name the elements present in a) zinc sulphide b) sodium oxide
Answers
Answer:
a) zinc, sulphur, oxygen
b) sodium, oxygen
Interms of air molecules, what gives a balloon its shape when air is blown into it
Answers
Answer: Because when you blow air /gas into a balloon you fill it with air particles ,so they more you blow u blow in more air particles so they tend to collide with each other ,so as they hit the walls of the balloons pressure is exerted ,so the pressure keeps the balloon inflated with its shape
Sulfur trioxide is a gas that reacts with liquid water to produce aqueous sulfuric Acid or acid rain what is the equation for this reaction do not worry about balancing the equation.
Answers
Answer:
SO₃(g) + H₂O(l) → H₂SO₄(aq)
Explanation:
The molecular formula for the involved species are:
Sulfur trioxide = SO₃. ("trioxide" indicates the presence of 3 oxygen atoms).Water = H₂OSulfuric acid = H₂SO₄With the above information in mind we can proceed to write the reaction equation:
SO₃(g) + H₂O(l) → H₂SO₄(aq)how does dalton's atomic theory account for the fact that different samples of the same compound always contain a fixed mass percentage of its component elements?
Answers
Dalton's atomic theory can account for the fact that different samples of the same compound always contain a fixed mass percentage of its component elements in the following way:
According to Dalton's atomic theory, atoms are indivisible and cannot be created or destroyed. All atoms of a given element are identical in mass and other properties.
Atoms combine in small whole-number ratios to form compounds. This means that every molecule of a given compound contains the same number of atoms of each element. This principle is known as the law of definite proportions. When a compound is formed by the combination of atoms of two or more elements, the ratio of the masses of these elements in the compound is always the same. The ratio of the masses of the constituent elements is fixed and constant in any given compound. This is the reason why different samples of the same compound always contain a fixed mass percentage of its component elements.
Dalton's atomic theory provides an explanation for the observation that different samples of the same compound always contain a fixed mass percentage of its component elements. According to Dalton's theory, atoms are indivisible and cannot be created or destroyed. All atoms of a given element are identical in mass and other properties. When atoms of two or more elements combine to form a compound, they do so in small whole-number ratios. This means that every molecule of a given compound contains the same number of atoms of each element.The law of definite proportions is a fundamental principle of Dalton's atomic theory. It states that when a compound is formed by the combination of atoms of two or more elements, the ratio of the masses of these elements in the compound is always the same.
This principle is also known as the law of constant composition. It applies to all compounds, regardless of how they were formed or where they are found. The ratio of the masses of the constituent elements is fixed and constant in any given compound. This is the reason why different samples of the same compound always contain a fixed mass percentage of its component elements.
Dalton's atomic theory accounts for the fact that different samples of the same compound always contain a fixed mass percentage of its component elements by stating that atoms of different elements combine in small whole-number ratios to form compounds, and that the ratio of the masses of the constituent elements in a compound is always the same. This principle is known as the law of definite proportions and is a fundamental principle of Dalton's atomic theory.
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ΔH for the reaction below is -826.0 kJ/mol. Calculate the heat change when a 69.03-g sample of iron is reacted.4Fe(s) + 3 O2(g) --> Fe2O3(s)a. - 255.2 kJb. -510.5 kJc. -1020.9 kJd. -2042 kJe. -2.851 x 10^4 kJ
Answers
Answer:
c. -1020.9 kJ
Explanation:
4Fe (s) + 3 O₂ (g) --> 2 Fe₂O₃(s) ΔH = -826.0 kJ/mol.
atomic weight of iron = 56
69.03 g = 69.03 / 56
= 1.23268 moles
Heat released by 1.23268 moles
= 1.23268 x 826.0
= -1020.9 kJ .
Why is the color for a specific element always the same
Answers
Answer:
Below:
Explanation:
The electrons of the atoms of an element are located in specific energy levels, and only certain energy changes are possible when the electrons move back to the ground state from higher energy levels.
Hope it helps..
It's Ms-Muska
element x has two naturally occurring isotopes, 65x (isotopic mass 65.2666 amu, abundance 27.42%) and 67x (isotopic mass 66.8273 amu, abundance 72.58%). calculate the atomic mass of element x.
Answers
The atomic mass of element x is 66.5340 amu.
The atomic mass, also known as the atomic weight, is the weighted average of the masses of all the isotopes of an element, taking into account their natural abundance. It is expressed in atomic mass units (amu) and is used as an indication of the size of an atom.
The atomic mass of an element can be used to determine the relative masses of atoms and is used in chemical calculations and reactions.
The atomic mass of element x can be calculated by weighting the mass of each isotope by its natural abundance and summing them:
Atomic mass of element x = (mass of 65x * abundance of 65x) + (mass of 67x * abundance of 67x)
= (65.2666 amu * 27.42%) + (66.8273 amu * 72.58%)
= 18.0550 amu + 48.4790 amu
= 66.5340 amu
Therefore, the atomic mass of element x is 66.5340 amu.
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27. A buffer solution
a.
is used to control the pH of a solution
b.
contains at least 100 times more of a weak acid than its conjugate base
c.
contains at least 100 times less of a weak acid than its conjugate base
d.
always has a pH of 7
Answers
A buffer solution a) is used to control the pH of a solution.
Explanation:
A buffer solution is used to control the pH of a solution. It is made by mixing a weak acid and its conjugate base or a weak base and its conjugate acid. This combination helps resist changes in pH when small amounts of an acid or base are added to the solution.
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PLZ HELP!
How do you think changing the angle of a ramp will affect work done?
Answers
Answer: The steepness of a ramp affects it by making it easier or harder.
Explanation: It's a bit situational. If you were going up a steep ramp with a heavy load, it will increase the work necessary, whereas if you were going down a ramp, it would decrease the work necessary. If you need this simply put, think about biking up and down a hill. It would be easier going down than up.
Pls help nowwww I’m begging
Answers
Pl help it’s for a grade I will give Brainly
Answers
Answer:
its B
Explanation:
The type of chemical bond resulting from a complete electron transfer is:
metallic
covalent
radical
ionic
Answers
Answer:
ionic / electrovalent bonds
Explanation:
Answer:
4. Ionic
Explanation:
What was wrong with Bohr’s model of the atom?
Answers
which of these processes are chemical reaction
Answers
Answer:
I don't think u finished the question -
What is the pH of a Weak Acid solution whose concentration is 10-4M?
Answers
Explanation:
We are given: concentration of a weak acid = 10^-4 M
\(\begin{gathered} pH\text{ = -log\lbrack H}^+] \\ \\ \text{ = -log\lbrack10}^{-4}] \\ \\ \text{ = 4} \end{gathered}\)Answer:
The pH of a weak acid is 4.
Determine whether each of the reactions given below would be spontaneous or not. Please justify your answer in each case.
A. Fe2+ (aq) + Al (s) → Al3+(aq) + Fe (s)
B. Pb2+ (aq) + Sn (s) → Sn2+ (aq) + Pb (s)
C. Mg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s)
Answers
A spontaneous reaction is one in which the change in free energy is negative and the standard cell potential is positive.
For a redox reaction to be spontaneous, the electrode potential of the cell must be positive and this depends on the relative electrode potentials of the species involved in the reaction. A metal can not displace a metal above it in the electrochemical series from solution.
Based on this;
Fe2+ (aq) + Al (s) → Al3+(aq) + Fe (s) is spontaneous because iron is lower than aluminium in the electrochemical seriesPb2+ (aq) + Sn (s) → Sn2+ (aq) + Pb (s) is spontaneous because lead is lower than tin in the seriesMg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s) is not spontaneous because magnesium is above silver in the series.Lean more: https://brainly.com/question/24556237
If 1.90 g of silver are produced from the reaction, how many moles of copper(II) nitrate are also produced?
Answers
If 1.90 g of silver are produced from the reaction, then 0.0176 moles of copper(II) nitrate are also produced.
Why is a chemical reaction?A chemical reaction occurs when moving molecules hit each other, breaking their bonds and producing an exchange of atoms that form new products. Another way a chemical reaction can occur is through the vibration of substances; when they do so with sufficient energy, they can be broken down into smaller molecules.
we need to use the balanced chemical equation,
3Cu(NO3)2 + 2Al → 3Cu + 2Al(NO3)3
we can see that 3 moles of Cu(NO3)2 react with 2 moles of Al to produce 3 moles of Cu. Therefore, the molar ratio of Cu(NO3)2 to Cu is 3:3 or 1:1.
m(Ag) = 1.90 g
M(Ag) = 107.87 g/mol
n(Ag) = m(Ag) / M(Ag)
n(Ag) = 1.90 g / 107.87 g/mol
n(Ag) = 0.0176 mol
The molar ratio of Cu(NO3)2 to Cu is 1:1, the moles of Cu produced in the reaction is also 0.0176 mol. So, the number of moles of Cu(NO3)2 produced is also 0.0176 mol.
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Why reaction between phosphorus and oxygen produces four atoms of phosphorus and five atoms of oxygen
Answers
Answer:
Reaction between an oxygen and a phosphorus will produce oxides of phosphorus.
Explanation:
Reaction between oxygen and phosphorus produces four atoms of phosphorus with five atoms of oxygen. Sometimes it produces two atoms of phosphorus and five atoms of oxygen and sometimes four atoms of phosphorus and six atoms of oxygen. It does so depending upon the availability of oxygen. The size of phosphorus atom interferes with the ability to form a double bonds to the other elements, such as nitrogen, oxygen, etc.
What pressure is required to compress 196.0 liters of air at 1.00 atmosphere into a cylinder whose volume is 26.0 liters?
Answers
Answer:
if volume of the gas increases, its pressure decreases, and vice versa. mathematically, if the volume of the gas is
V
1
and its pressure is
P
1
. Let us suppose that its volume has been increased to
V
2
, the as per the Boyle's law its pressure will decrease and let us assume the new pressure is
P
2
.
P
1
V
1
=
P
2
V
2
P
1
= 1 atm
V
1
= 196 L
P
2
= ?
V
2
= 26 L substitute the values;
1 atm x 196 L =
P
2
x 26 L
P
2
= 1 atm x 196 L / 26 L
P
2
= 196 atm L / 26 L = 7.53 atm
Explanation:
I hope this helps.
Answer:
7.53 atm
Explanation:
Boyle studied the relationship between the pressure of a trapped gas and its volume. The data obtained by him shows that the product of pressure and volume for the trapped air sample is constant at a constant temperature. if volume of the gas increases, its pressure decreases, and vice versa. mathematically, if the volume of the gas is V 1 and its pressure is P 1 . Let us suppose that its volume has been increased to V 2 , the as per the Boyle's law its pressure will decrease and let us assume the new pressure is P 2 . P 1 V 1 = P 2 V 2 P 1 = 1 atm V 1 = 196 L P 2 = ? V 2 = 26 L substitute the values; 1 atm x 196 L = P 2 x 26 L P 2 = 1 atm x 196 L / 26 L P 2 = 196 atm L / 26 L = 7.53 atm
how to Use your trend line to estimate the gas pressure of this system at 0°C.
Answers
Answer:
The slope of the trend line is 2.55; as the temperture.
Explanation:
What does percent composition tell you about a molecule?
®
A. It tells
you the ratio of elements in the molecular formula.
•
B. It gives you the total number of atoms in the molecule.
•
C. It tells you how much of a molecule IS made up of each element.
•
D. It tells
you how the elements are arranged in the molecule.
Answers
Answer:
C
Explanation:
Answer:
The awnser is C: it tells you how much of a molecule IS up of each element.
Required: a. Compute the acid-test ratio for each of the separate cases above. b. Which company is in the best position to meet short-term obligations? Complete this question by entering your answers
Answers
Among the three companies, Company A has the highest acid-test ratio (2.67), followed by Company B (2.00), and then Company C (1.75). The higher the acid-test ratio, the better the company's ability to meet short-term obligations without relying on inventory sales. Therefore, Company A is in the best position to meet short-term obligations.
To compute the acid-test ratio (also known as the quick ratio) for each company, we'll use the formula:
Acid-Test Ratio = (Current Assets - Inventory) / Current Liabilities
a. Compute the acid-test ratio for each company:
Company A:
Current Assets = $250,000
Inventory = $50,000
Current Liabilities = $75,000
Acid-Test Ratio for Company A = ($250,000 - $50,000) / $75,000
Acid-Test Ratio for Company A = $200,000 / $75,000
Acid-Test Ratio for Company A ≈ 2.67
Company B:
Current Assets = $150,000
Inventory = $30,000
Current Liabilities = $60,000
Acid-Test Ratio for Company B = ($150,000 - $30,000) / $60,000
Acid-Test Ratio for Company B = $120,000 / $60,000
Acid-Test Ratio for Company B = 2.00
Company C:
Current Assets = $300,000
Inventory = $90,000
Current Liabilities = $120,000
Acid-Test Ratio for Company C = ($300,000 - $90,000) / $120,000
Acid-Test Ratio for Company C = $210,000 / $120,000
Acid-Test Ratio for Company C = 1.75
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What is the name of cells that have the ability to develop into different
kinds of cells?
Answers
Answer:
stem cells
Explanation:
hope it helps
The atomic number of an element is 10, which element does this atom represent?
Answers
Answer:
Neon
Explanation:
Neon is the Group 18 element.It is a nobel gas.electronic configuration is given by\(\\ \sf\longmapsto [Ne]=1s^22s^22p^6\)
Answer:
Name: Neon
Formular: Ne
Explanation:
\(.\)
Draw and give the IUPAC names for the following organic molecules:
• Ascorbic Acid (Vitamin C)
• Fructose
• Glucose
Answers
IUPAC name -Ascorbic Acid (Vitamin C)-(5R)-[(1S)-1,2-Dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one, Fruit sugar or D-fructose are other names for fructose-fructose. D-glucose, or glucose.
Why is ascorbic acid the name of the vitamin C?Early in the 1930s, vitamin C—then known as "hexuronic acid"—was extracted from fruits, vegetables, and the adrenal cortex. After being proved to treat scurvy in guinea pigs, it was renamed ascorbic acid to reflect its anti-scorbutic qualities.
Are chemicals ascorbic acid?Description. Ascorbic acid, a naturally occurring organic substance with antioxidant qualities, is offered by TCC. C6H8O6 is its chemical formula. It is a crystalline white substance that mixes easily with water to form moderately acidic solutions.
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if an atom has 35 protons in nucleus how many neutrons will it have orbiting the nueclues
Answers
Answer
Because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. So, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.
Explanation:
(PLEASE HELP)
Analyzing the pros and cons of a decision can help you make a difficult choice. Which of the following is a pro associated with the use of hydropower as an energy source?
A. A large amount of energy can be released by a small amount of fuel.
B. The use of hydropower produces environmentally friendly waste products.
C. Hydropower is a renewable energy source.
D. The chemical reactions involved remove harmful substances from the air.
Answers
Some analytes must be derivatized to increase their column retention or detectability. Derivatization means Group of answer choices altering the chemical structure of the analyte to increase detection and specificity. adding fluorescent labels or combining the analyte with chiral reagents or other chemicals to increase detectability. removing dissolved gases in the solvent to produce a clear chromatogram. using multiple detectors to assist in identification.
Answers
Derivatization means adding fluorescent labels or combining the analyte with chiral reagents or other chemicals to increase detectability.
Some analytes must be derivatized to increase their column retention or detectability.
Retention time can be referred to as the amount of time a solute spends in the stationary and mobile phases of a column.
Detectability is the ability of an analyte to get detected in the mobile phase of chromatography.
The refractometer, fluorescence detector, and UV detector are the three most popular liquid chromatography detectors. These detectors increase the detectability.
For derivatization, the fluorescence detector are used.
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