Answer:
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Explanation:
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add or subtract the following measurements. be sure each answer you enter contains the correct number of significant digits. −4.520g1.3g
The significant digits are
4 significant digits (addition) = -3.220g
subtract: -5.820g, which has four significant digits.
The process for determining significant digitsTo calculate how many significant figures are in a number, use the three guidelines below:Non-zero digits are always significant. Notable zeros fall inside the range of two significant digits.The final zero or subsequent zeros only matter in the decimal part.What are some significant digits examples?Any pair of non-zero digits separated by a zero is significant. The number 108.0097, for instance, includes seven significant digits.Every zero that is both to the right and left of a digit that is not zero and the decimal point has no significance.The number 0.00798, for instance, contained three significant digits.learn more about significant digits here
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During science lab, some students added small pieces of magnesium (Mg) to hydrochloric acid (HCl). They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.
Which of the following is a sign that a chemical reaction has taken place in this experiment?
A) odor B) formation of gas C) decrease in temperature D) formation of a precipitate
The structure of matter refers to its _____.
Select one:
a.
composition
b.
measurements
c.
behavior
d.
reactions
The structure of matter refers to its composition.
a. compositionwhen solid pellets of sodium hydroxide (naoh) dissolve in water, the temperature of the water can rise dramatically. taking naoh as the system, what can you deduce about the signs of the entropy change of the system (δssys) and surroundings (δssurr) from this?
ΔSsys and ΔSsurr both have values larger than 0.
Entropy Change: What Is It?Entropy change is a phenomena that measures the evolution of randomness or disorder in a thermodynamic system.It has to do with how heat or enthalpy is converted during work. More unpredictability in a thermodynamic system indicates high entropy.Heat transport (delta Q) divided by temperature equals the change in entropy (delta S).What causes variations in entropy?When a substance is divided into several pieces, entropy rises. Because the solute particles are split apart when a solution is generated, the dissolving process increases entropy. As the temperature rises, entropy increases.learn more about entropy change here
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Why do we need units of pressure?
Answer:Because there are so many units for energy.
Explanation:
Which 2 organelles make the protein needed for the cell?
Answer:
The endoplasmic reticulum
Explanation:
can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function.
Susie has a box that has a mass of 6g and volume of 2 cm3
. What is the Density of the box?
How many valence electrons does Sodium (atomic #11) have? (1 pt)
*
1 point
1
7
8
11
which ionic bond is stronger: the ionic bond between calcium ions and chloride ions in crystalline calcium chloride , or the ionic bond between potassium ions and chloride ions in crystalline ? explain.
CaCl2 has a stronger ionic bond than KCl because Ca+2 is smaller than K+ in size.
What is the working of ionic bonds ?A stable link formed by the complete transfer of the valence electron is known as an ionic bond. This kind of interaction results in the formation of positive ions, also known as cations, and negative ions, also known as anions.
This kind of interaction is exemplified by the ionic bond in sodium chloride, a salt. The sodium valence electron is transferred to the outer electron shell of chloride. Ionic molecules form the basis of ionic compounds.The three types of bonds that frequently develop are covalent bonds between nonmetals, ionic bonds between metals and nonmetals, and metallic connections between metals.Learn more about Ionic bond here:
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. Apply Concepts Are there more tissues or more organs in your body
Explain your reasoning.
Answer:
Explanation:
Organs are more complex units than tissues. An organ is an organization of several different kinds of tissues so arranged that together they can perform a special function.
There are more tissues in our body. Tissues are collections of comparable cells that collaborate to carry out particular functions.
Thus, cells are of the same type or different types, they work together to complete a certain mission.
Epithelial tissue, which lines the skin and organs, muscle tissue, which enables movement, and nerve tissue, which transmits electrical signals are a few examples of tissues.
Organs are structures consisting of two or more distinct tissue types that cooperate to carry out a certain function or group of functions in the body. Organs have certain shapes and purposes. Heart is one instance of an organ.
Thus, There are more tissues in our body. Tissues are collections of comparable cells that collaborate to carry out particular functions.
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Conduct research to learn about the history
of atomic models and the scientists who developed the models. Identify any
experimental evidence and reasoning that supported each model
The atomic theory have been developed over the years by the works of many scientists.
What is the atomic theory?The atomic theory is the series of postulations that sought to explain the behavior of the atom. The study of the atom started as far back as the time of Democritus and Aristotle.
The first empirical study of the nature of the atom started with the work of John Dalton when he proposed the famous Dalton's theory. Further empirical work was carried out by J.J Thompson which gave rise to the plum pudding model of the atoms.
The work of Ernest Rutherford introduced the planetary model of the atom which was latter replaced by the Bohr model based on energy levels. Today, the work of Erwin Schrödinger has led us to the appreciation of the wave mechanical model of the atoms which is the mot accepted model for the atom today.
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Select the correct answer. which type of property can be observed only by changing a substance into a different substance? a. intensive property b. extensive property c. physical property d. chemical property
The correct option is D: Chemical property
Chemical properties can be observed only by changing a substance into a different substance.
When a substance or a material undergoes a chemical change then it becomes a completely different kind of substance.
In chemistry, chemical properties are the kind of properties that can be observed or measured as a result of a chemical change.
Examples of chemical changes are rusting of iron, combustion of a compound or fossil fuels, flammability, reactivity, acidity, and toxicity.
To put it simply, a chemical property brings a complete change to the identity of a matter.
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calculate the number of coulombs of positive charge in 250cm 3 of (neutral) water. (hint: a hydrogen atom contains one proton; an oxygen atom contains eight protons.)
Number of coulombs of positive charge in 250cm^3 water is 1.3×10^7 C
The volume of 250 cm^3 corresponds to a mass of 250 g since the density of water is 1.0 g/cm^3
This mass corresponds to 250/18 = 14 moles since the molar mass of water is 18. There are ten proton (each with charge q = +e) in each molecule of [tex]H_{2}O[/tex] So,
Q = 14NA q =14(6.02×10^23)(10)(1.60×10^−19C) = 1.3×10^7 C.
Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.
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What are the products of the acid-base reaction between hclo3 and lioh? liclo4 h2o lih liclo3 hclo4
The products of the acid-base reaction between chloric acid [tex](HClO_{3})[/tex], and lithium hydroxide [tex](LiOH)[/tex], are water [tex](H_{2}O)[/tex] and lithium chlorate [tex](LiClO_{3} )[/tex]
An acid-base reaction is a chemical reaction that occurs between an acid and a base producing salt and water. It is a double-replacement reaction where ions exchange their positions.
The general equation of an acid-base reaction is as follows.
Acid + Base → Salt + Water
The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.
For the reaction between chloric acid [tex](HClO_{3})[/tex], and lithium hydroxide [tex](LiOH)[/tex], the H(+) cation of the acid [tex](HClO_{3})[/tex] combines with the OH(-) anion of the base [tex](LiOH)[/tex] to form water. The compound formed by the cation of the base [tex](LiOH)[/tex] and the anion of the acid [tex](HClO_{3})[/tex] is lithium chlorate.
[tex]H^{+}+ ClO_{3}^{-} +Li^{+} +OH^{-} = LiClO_{3} + H_{2}O[/tex]
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Using the dimensional Analysis
In the Above questions to convert 14,612 mL to DAL which of the following portrays to correct set up
The correct dimensional analysis for the conversion of 14,612 mL to daL is shown in option A.
What is unit conversion?Many times, it important to determine the value of measurement across different units. This is why we need to convert from on unit to another. Such a conversion is made possible by the use of a conversion factor.
Now we know that there is a conversion factor that could be used to convert mL to daL. This conversion factor has to be laid out in a way that is dimensionally correct so that the units could cancel out.
The correct dimensional analysis for the conversion of 14,612 mL to daL is shown in option A.
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Look at the clock and listen to the statement. Indicate whether the statement is cierto or falso. Questions 0:13 / 0:48 1. Cierto falso 2. Cierto falso 3
Answer:
Amigo esta es mi respuesta
Explanation:
No entiendo
Draw the conjugate acid for the following base (lone pairs do not have to be drawn):
Answer:
\ \
=o + H+ ----> =o
/- /
conjugate acid is the product that is differ from the base by one proton
state the name given to the different structures that can be drawn to represent the covalent bonding in a molecule that has more than one position in the molecule for a multiple bond
Structures that can be drawn to represent the covalent bonding in a molecule that has more than one position in the molecule for a multiple bond are known as Position Isomers.
Position isomers are isomers with same chemical formula but the functional group is attached to different position of carbon in different structures.
Example-
Hex1-ene , Hex2-ene, Hex3-ene are position isomers with double bond on first, second and third carbon respectively as shown below-
[tex]CH_2= CH-CH_2-CH_2-CH_2-CH_3\\CH_3-CH=CH-CH_2-CH_2-CH_3\\CH_3-CH_2-CH=CH-CH_2-CH_3[/tex]
Other examples are pent1-yne and pent2-yne where triple bond is on first and second carbon respectively.
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How many atoms are there in 7.61 grams of arsenic?
Answer: 1.24 X 10-22 g. The atomic mass of arsenic is 74.92 amu, 1 mole of arsenic atom has 74.92g weight.
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.602×10²³ atoms are there in 7.61 grams of arsenic.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
given mass of arsenic= 7.61 grams
Molar mass of 1 mole of arsenic= 74.92g/mol
substituting the given values, we get
number of mole of arsenic =7.61 ÷ 74.92g
=0.10moles
number of atoms of arsenic= number of moles of arsenic× Avogadro number
=0.10× 6.022×10²³
=0.602×10²³ atoms
Therefore, 0.602×10²³ atoms are there in 7.61 grams of arsenic.
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a pure substance has the blank composition in all of the sample
A pure substance has definite composition and constant properties in all of the sample
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample, ex: elements and compoundsElement: A substance that cant be broken down into chemically simpler components, ex: Aluminum , gold etcCompound : A substance that can be broken down into chemically simpler components, ex : water is compound composed of the elements hydrogen and oxygen.All pure substances have definite set of properties but they can vary in their physical states, chemical compositions and color.Characteristics and Properties Of Pure Substances
Pure substances are homogeneous in nature containing only one type of atom or molecule.These substances have a constant or uniform composition throughout.These substances have fixed boiling and melting points.Pure substance usually participates in a chemical reaction to form products.Thus we can conclude that a pure substance has definite composition in all of the sample
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Mike has an object thrown in the air. It has the mass of 10kg and is 2 meters above the ground. Calculate the potential energy of the object
Answer:
200J or 196J
Explanation:
mass = 10kg
gravity = 9.8 or 10 ( the answer might vary if u take either 10 or 9.8 as the gravitational value )
height = 2 meter
p.e= mgh
option 1
10×10×2 = 200 Joules
option 2
10×9.8×2 = 196 Joules
better to take 9.8 as gravitational value
hope it helps
Carbon monoxide is formed in the blast furnace. This reduces the ore hematite, Fe2O3, to iron.
(i) Explain how carbon monoxide is formed in the blast furnace.
Answer:
At the high temperature at the bottom of the furnace,carbon to produce carbon monoxide
Explanation:
The coke (essentially impure carbon) burns in the blast of the hot air to form carbon dioxide - a strongly exothermic reaction. This reaction is the main source of heat in the furnace
when 3.12 g of a nonelectrolyte solute is dissolved in water to make 215 ml of solution at 27 °c, the solution exerts an osmotic pressure of 913 torr. what is the molar concentration of the solution? concentration: m how many moles of solute are in the solution? moles of solute: mol what is the molar mass of the solute? molar mass:
0.0105 mol of non-electrolyte solute, with 297.14 g/mol molar mass, is dissolved in water to make a 0.0488 M solution.
Given:
mass of solute (m) = 3.12 gvolume of solution (V) = 215 mL Temperature (T) = 27 deg C or 300 KGas-constant (R) = 0.08206 L-atm/mol-KOsmotic pressure is expressed mathematically as π=M*R*T. The concentration of the solution "M" should be expressed in molarity, mol/L. Through the use of the formula, let us solve for the concentration of the solution. The osmotic pressure must be converted to atm.
Conversion factor: 1 atm has 760 torr.
913 torr * (1 atm/760 torr) = 1.20131 atm
π = 1.20131 atm = M*(0.08206 L-atm/mol-K)*(300 K)
M = 0.0488 M
From the molar concentration of the solution, we can solve for the number of moles of the solute.
M = mol solute / volume solution
mol solute = M * volume solution
mol solute = 0.0488 M * (215 mL) * (1 L/1000 mL)
mol solute = 0.0105 mol
Then, we can solve for the molar mass of the solute.
molar mass solute = mass solute / mol solute
molar mass solute = 3.12 g / 0.0105 mol
molar mass solute = 297.14 g/mol
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the diameter of the nucleus of an atom is approximately 1 × 10-15 meters. if 1 nm is equal to 10 ångstroms, what is the diameter of the nucleus in ångstroms?
The diameter of the nucleus in angstrom, given the data is 1×10⁻⁵ angstrom
Conversion scale1 nm = 10 angstrom
Data obtained from the questionThe following data were obtained from the question:
Diameter (in meters) = 1×10⁻¹⁵ mDiameter (in angstrom) =?How to convert 1×10⁻¹⁵ m to nm1 m = 1×10⁹ nm
Therefore,
1×10⁻¹⁵ m = (1×10⁻¹⁵ m × 1×10⁹ nm) / 1 m
1×10⁻¹⁵ m = 1×10⁻⁶ nm
How to convert 1×10⁻⁶ nm to angstrom1 nm = 10 angstrom
Therefore,
1×10⁻⁶ nm = (1×10⁻⁶ nm × 10 angstrom) / 1 nm
1×10⁻⁶ nm = 1×10⁻⁵ angstrom
Thus, the diameter of the nucleus in angstrom is 1×10⁻⁵ angstrom
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The periodic table of elements should really be called the periodic table of atoms. Use oxygen as an example to explain why?
The atomic number, which is equal to the number of protons in the nucleus, controls the electrons in the atoms, which in turn control the chemistry.
The periodic table is all about chemistry, for one simple reason. The atomic number, which is equal to the number of protons in the nucleus, controls the electrons in the atoms, which in turn control the chemistry.
The atomic number is what distinguishes an element.
Additionally, if we have two distinct isotopes of the same element, their atom types will differ.
As a result, there is significant power in using isotopic systems that only use one element, as demonstrated by the analysis of the three oxygen isotopes (16O, 17O, 18O), which have different properties, should be treated as different types of atoms in an atoms table.
As each isotope of an element is listed as a different species, the chart of the nuclides can be thought of as a "chart of atoms."
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how many molecules are contained in a 5.15g sample of dimethylmercury?
The molecules in a 5.15 g sample of dimethylmercury is 1.32 x 10²².
Dimethylmercury is a highly volatile, toxic liquid, which is reactive and colourless. Its molecular formula is C₂H₆Hg. It is used in NMR instruments for calibration. It has risks involved, so it has few applications and used in a lesser quantity.
Dimethylmercury C₂H₆Hg has a molecular mass of -
Molecular mass = (12x2) x (1x6) x 200.59 = 230.6 g/mol
Now,
number of moles in 5.15 g of dimethylmercury = 5.15 = 0.022 mol
230.6
1 mole of dimethylmercury contains 6.022 x 10²³ molecules
So, 0.022 moles of dimethylmercury contains 0.022 x (6.022 x 10²³) = 1.32 x 10²² molecules
Molecules contained in 5.15 g sample of dimethylmercury is
1.32 x 10²²
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8. What are the bold faced words in the text?
This style of boldface writing has a few authorized applications. In general, style manuals advise against using it to emphasize. Italics and sentence structure are used for this. It is preferable to utilize boldface text sparingly because it might be aesthetically obtrusive.
Often boldfaced and larger than the surrounding text, titles, headers, and subheadings are used. For instance, the heading "Titles and headings" in this section is bold. This is typical for web publishing.
Boldface is frequently used in textbooks, manuals, and various types of web writing to draw attention to the first occurrence of a crucial keyword that is crucial to the topic of a chapter or article. For instance, in our article on the distinction between program and programme, we boldfaced the text to draw attention to the first occurrence of each keyword (i.e., program and programme). Later, the words do not appear in boldface.
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agcl would be least soluble in 1. 0.1 m hno3. 2. 0.1 m hcl. 3. 0.1 m nh3. 4. 0.1 m cacl2. 5. pure water.
The AgCl would be least soluble in 0.1M NaCl
Strength of NaCl Solution = 0.1M
K(sp) AgCl = 1.20 * 10⁻¹⁰
Let solubility of AgCl be 'x'
∴ AgCl ⇔ Ag⁺ + Cl⁻
x x x
∵ NaCl is strong electrolyte and is completely ionized. It shall provide Cl⁻ ion concentration = 0.1 M
[Ag⁺] = x [Cl⁻] = (x + 0.1) M
K(sp) = [Ag⁺] [Cl⁻] = x * (x + 0.1) = x² + 0.1x
∵ x << 1 ∴ x² is neglected
∴ 1.20 * 10⁻¹⁰ = 0.1x
⇒ [tex]x = \frac{1.20 * 10^{-10}}{0.1} = 1.20 * 10^{-9}[/tex]
Solubility of AgCl in 0.1M NaCl = 1.20 * 10⁻⁹M
By above method we find other four parts then we get,
Solubility of AgCl in 0.1M HCl = 1.8 * 10⁻¹⁰M
Solubility of AgCl in 0.1M NH₃ = 4.846 * 10⁻³M
Solubility of AgCl in 0.1M CaCl₂ = 1.8 * 10⁻¹⁰M
Solubility of AgCl in Pure Water = 1.5 * 10⁻¹⁰M
The order of solubility of AgCl in 1. 0.1M HNO₃. 2. 0.1M HCl. 3. 0.1M NH₃. 4. 0.1M CaCl₂. 5. Pure Water :-
0.1M NaCl < Pure Water < 0.1M HCl = 0.1M CaCl₂ < 0.1M NH₃
Thus, the AgCl would be least soluble in 0.1M NaCl
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How does dissolving sugar in water show that matter is made up of particles?
Answer:
When we dissolve sugar into water, the particles of sugar occupy the spaces between the molecules of water and eventually all the sugar disappears.
Explanation:
Answer:
you can see tiny bits of sugar become wet
Explanation:
then, you can see particles of sugar expand everywhere.
How do I solve this?
The mass percentage of each compound in the mixture is as follows:
mass percentage of Lithium chloride, LiCl = 14.11%
mass percentage of Lithium carbonate, Li₂CO₃ = 42.82%
mass percentage of lithium nitrate, LiNO₃ = 43.09%
What is the mass percentage of each compound in the mixture?The mass percentage of each compound in the mixture is calculated as follows:
Assuming the mixture consists of 1 mole of each of lithium chloride, LiCl, lithium carbonate, Li₂CO₃, and lithium nitrate, LiNO₃
Total mole of lithium = 4 moles
Total moles of oxygen = 6 moles
Total moles of Chloride = 1 mole
Total moles of Nitrogen = 1 mole
Li = 14.19 %
CI = 10.56%
C = 6.198 %
O = 59.06%
N = 10.01%
The mass percentage of each compound in the mixture will be:
mass percentage of Lithium chloride, LiCl = 14.19%/4 + 10.56% = 14.11%
mass percentage of Lithium carbonate, Li₂CO₃ = 2 * (14.19 %/4) + 6.198 % + 3 * (59.06%/6) = 42.82%
mass percentage of lithium nitrate, LiNO₃ = 14.19 %/4 + 10.01% + 3 * (59.06%/6) = 43.09%
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