Answer:
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy
the number of electrons in atoms determine an element's __ properties
Answer:
The number of electrons in atoms determine an element's chemical properties.
Hope this helps in any way :)
If 6.000 g of sugar is mixed with 9.000 g of water, what is the
concentration in weight percent?
The percent weight of the solution is 20% sugar solution.
What is the weight percent concentration of the solution?The concentration of a solution is the amount of solute that is present in a given volume or mass of a solution
The concentration of a solution can be expressed as:
molar concentrationmass concentrationpercentage concentrationThe percent weight of the solution is determined as follows:
Mass of sugar = 6.00 g
Mass of water = 9.00 g
Mass of solution = 9.00 + 6.00
Mass of solution = 15.00 g
Weight percent of solution = 6/15 * 100
Weight percent of solution = 20% sugar solution
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An atom with six protons and five
electrons would have an electric charge
of
O-1
O
O-2
O +1
Answer:
A positive charge of +1
Explanation:
The charge carried by atom depends on the number of protons and electrons present. The neutrons are not charged hence they do not contribute to the net charge of the specie.
The specie mentioned in the question has six protons and five electrons. Hence it has an excess of one positive charge hence a net charge of +1.
ANSWER:
ABCDFGHIJKLMNOPQRSTXYZ
A compound is found to contain 10.85 % silicon, 27.40 % chlorine, and 61.75 % bromine by mass. The empirical formula for this compound is?
introduction on eothermic and endothermic reaction
In an exothermic reaction, the energy of the reactants is greater than the energy of the products.
What is an exothermic reaction?The term exothermic reaction refers to a kind of reaction in which heat is given out in the system. In this type of reaction, the reaction vessel feels hot as a result of the fact that heat is given out. The energy of the reactants is greater than the energy of the products.
If we look at the enthalpies of an endothermic and exothermic reaction, we can see that the enthalpy of an endothermic reaction is positive while the value of the enthalpy change of an exothermic reaction is negative implying that heat was given out.
In the case of an endothermic reaction, energy is absorbed from this system. In this case, the reaction vessel feels cool as the energy of the products is greater than that of the reactants.
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? Question
Open the Forces box and select Total Force. Also, select Slow Motion at the bottom of the screen. Watch the force arrows
in the centers of the atoms. When do the atoms attract one another, and when do they repel?
Drag the tiles to the boxes to form correct pairs.
Tiles
Pairs
atoms attract each other
atoms repel each other
when atoms close in and overlap each other
when atoms lie separated from each other
US 122
When atoms close in and overlap each other; atoms repel each other. When atoms lie separated from each other; atoms attract each other
According to the theory of valence bonds, a covalent bond is made up of two atoms that are joined together and produce a pair of electrons that are shared by both of their bonded atomic orbitals. When a portion of one orbital and a portion of a second orbital occupy the same region of space on two separate atoms, we say that their orbitals overlap. The valence bond theory states that a covalent bond forms when two circumstances are true:
1. orbital on one atom overlaps another, and two solitary electrons in each orbital come together to form an electron pair.
2. atoms are physically connected by a force known as a covalent bond thanks to the attraction between this negatively charged electron pair and the positively charged nuclei of the two constituents. The degree of orbital overlap determines how strong a covalent bond will be. Stronger bonds are created by orbitals with more broad orbital overlap than by those with less overlap.
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Luster Malleability
Luster and malleable are the properties of metals.
What is Luster and malleable?Luster is the property of metal which depicts that metals are lustrous in nature that is shiny in appearance.Malleability is the property of metal which means that metals can be hammered into thin sheets.There is a property of metal named ductile, as metals are ductile which means metals can be drawn into thin wires.Zinc is an exception for the malleable property of metals.And for ductility there are two exceptions namely zinc and mercury.Some non-metals like carbon in the form of diamond are also lustrous in nature.Though there are four types of luster also but that depth is absolutely not worth , but to mention that namely waxy, pearly, vitreous, silky .To know more about metals visit:
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the word a'toms comes form a language what language is it from?
Answer:
A'toms comes from the Greek language.
Hope this helps :)
A sample of 0.215 M Co(NO3)2 contains 2.53 x 10^22 nitrate ions. The volume of the sample is____mL
Report your answer to three significant digits and do not use scientific notation.
The volume of the sample, given the data from the question is 97.7 mL
How to determine the mole of nitrate ion, NO₃⁻We'll begin by obtaining the mole of the nitrate ion, NO₃⁻ that contains 2.53×10²² ions. This can be obtained as follow:
From Avogadro's hypothesis,
6.02×10²³ ions = 1 mole of NO₃⁻
Therefore,
2.53×10²² ions = (2.53×10²² ions × 1 mole) / 6.02×10²³ ions
2.53×10²² ions = 0.042 mole of NO₃⁻
How to determin the mole of Co(NO₃)₂Co(NO₃)₂(aq) --> Co²⁺(aq) + 2NO₃⁻(aq)
From the equation above,
2 moles of NO₃⁻ is present in 1 mole of Co(NO₃)₂
Therefore,
0.042 mole of NO₃⁻ will be present in = 0.042 / 2 = 0.021 mole of Co(NO₃)₂
How to determine the volume of the sampleMole of Co(NO₃)₂ = 0.021 moleMolarity of Co(NO₃)₂ = 0.215 MVolume = ?Molarity = mole / volume
Thus,
Volume = mole / molarity
Volume = 0.021 / 0.215
Volume = 0.0977 L
Multiply by 1000 to express in mL
Volume = 0.0977 × 1000
Volume = 97.7 mL
Thus, the volume of the sample is 97.7 mL
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Atomic mass of 7.0150 amu natural abundance of 92.58 Second has a atomic mass of 6.0150 amu a percent natural abundance of 7.42 What is the atomic weight of the element
The atomic weight of the element is 6.9408 amu.
The relative abundance of an isotope is defined as the percentage of atoms of a specific atomic mass that can be found in a naturally occurring sample of an element.
The atomic mass of the first isotope is 7.0150 amu.
The abundance of the first isotope is 92.58 %.
The atomic mass of the second isotope is 6.0150 amu.
The abundance of the second isotope is 7.42 %.
Now, abundance₁ = 92.58 % = = ( 92.58/ 100) = 0.9258
abundance₂ = 7.42 % = (7.42 / 100 ) = 0.0742
Therefore, the average atomic weight is:
Atomic mass = mass₁ × abundance₁ + mass₂ × abundance₂
Atomic mass = (7.0150) × (0.9258) + (6.0150) × (0.0742) amu
Atomic mass = 6.494487 + 0.446313 amu
Atomic mass = 6.9408 amu
The element's atomic weight is 6.9408 amu.
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How can you separate sand pours salt and styrofoam beads
Physical separation (picking out pieces or employing density to shake sand to the top), salt dissolution in water, and salt melting are the three techniques used to separate salt and sand.
What is physical separation?
The differing densities of salt and sand are the basis for another physical separation technique. Sand has a density of 2.65 g/cm3, but salt has a density of 2.16 g/cm3.
Based on solubility, one technique for distinguishing salt and sand exists. When a substance dissolves in a solvent, it is said to be soluble. An ionic chemical that is soluble in water is salt, often known as sodium chloride or NaCl.
Based on melting point, there is yet another technique to separate combination components. Sand has a melting point of 3110°F (1710°C), while salt has a melting point of 1474°F (801°C).
Therefore, Physical separation (picking out pieces or employing density to shake sand to the top), salt dissolution in water, and salt melting are the three techniques used to separate salt and sand.
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wood needs to be given heat energy to reach the temperatures required for combustion to begin. what property of the wood would you need to know to predict how fast the wood would start to burn? explain
The property of the wood that is to be needed to know to predict how fast the wood would start to burn is combustion.
Combustion is a chemical reaction that occurs between a combustible material, a substance that causes or favors the combustion of other substances that is oxidizer and oxygen, all this accompanied by outgoing energy in the form of heat (exothermic energy) and incandescent energy.In this case, wood is the combustible material, and combustion is generated by separate energy, fire, phosphors, and sparks.Wood combustion is dependent on so many variables e,g. weather, temperature, humidityBut the wood of small size tends to ignite faster than those with larger density.To learn more about combustion visit:
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How would the following errors affect the empirical formula for the compound? That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? a. The student ran out of time and did not do the second heating. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will ht efinal answer be artificially high or low? b. The student recorded the mass of the cup + sample incorrectly and started with 2.20 g of hydrated compound but used 2.00 g in the calculations. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low? How do you know?
The heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.
What is mole?Mole is defined as a standard scientific unit for measuring large quantity for very small unit.
Heating is done to eliminate water from the compound, if second heating is not done it means water is present in the compound. While calculating we will get higher molecular mass and moles of water is lower then the actual value.
The artificially calculated moles of water is lower, because the student consider the lower initial mass. The difference between the said value and calculated value is also lower and the student will think that less water was consumed on heating.
Thus, the heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.
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Pretest Unit 1
Question 11 of 30
What is the change in the freezing point of water when 35.0 g of sucrose is
dissolved in 300.0 g of water?
K, of water = -1.86°C/mol
molar mass sucrose = 342.30 g/mol
ivalue of sugar = 1
ΔTf=−0.634°C
Explanation:
We're asked to find the freezing point depression of a solution.
To do this, we use the equation
ΔTf= i⋅m⋅Kf
where,
ΔTf is the change in freezing point temperature that we're trying to find.
i is the Van't Hoff factor, which is given as 1 (and usually is 1 in the case of nonelectrolytes)
m is the molality of the solution, which is
molality = mol solute /kg solvent
Convert the given mass of sucrose to moles using its molar mass:
35.0g sucrose(1lmol sucrose342.30g sucrose)=0.102 mol sucrose
The molality is thus
molality=0.120lmol sucrose/0.3000lkg water=0.341m
K f is the molal freezing point constant for the solvent (water), which is given as −1.86°C/m
Plugging in known values, we have
ΔTf=(1)(0.341m)(−1.86l°C/m)
=−0.634l°C
This represents how much the freezing point decreases. The new freezing point of the solution is found by adding this value from the normal freezing point of the solvent ( 0.0°Cfor water):
new f.p. = 0.0°C −0.634°C
= −0.6341°C
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Initially, 0.880 mol of A is present in a 3.00 L solution.
2A(aq)↽−−⇀2B(aq)+C(aq)
At equilibrium, 0.150 mol of C is present. Calculate K.
The value of the equilibrium constant, K of the reaction is 0.055 M
What is the value of the equilibrium constant, K of the reaction?The value of the equilibrium constant, K of the reaction is determined as follows:
Equation of reaction: 2 A (aq) ⇄ 2 B (aq) + C (aq)
Initial moles of A present = 0.88 mol
Volume of solution = 3.00 L
At equilibrium,
moles of C present = 0.150 moles
moles of B present = 2 * 0.150 moles
moles of B present = 0.300 moles
moles of A present = 0.880 - (0.300 + 0.150)
moles of A present = 0.430 moles
Concentration of C = 0.15/3 = 0.050 M
Concentration of B = 0.45/3 = 0.150 M
Concentration of A = 0.43/3 = 0.143 M
K = (0.050 * 0.150²)/0.143²
K = 0.055 M
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Question
Which statement is correct?
The invention of the hand lens helped scientists discover cells
The invention of the hand lens helped scientists discover cells,
The invention of the the microscope helped scientists discover cells
The invention of the the microscope helped scientists discover cells.
What are cells?Cells are the basic unit of life from which all living organisms are built up from.
Prior to the discovery of cells, scientists did not have any instrument to properly view cells.
However, with the invention of the microscope, the English scientist Robert Hooke was able to discover cells when he viewed plant cells through a microscope.
Today, with the help of more powerful microscopes such as the electron microscope, other structures that are found within the cell have been discovered.
In conclusion, the discovery of cells was aided by the invention of microscope.
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A gas leak was detected in an apartment building and the resulting gas was analyzed. A sample was found to contain 1.54 grams of sulfur and 0.0968 grams of hydrogen. Determine the empirical formula for the leaked gas.
atomic structure the center of the atom
Answer:
yes, atomic structure the center of the atom is nucleus ;
The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge. Protons, neutrons, and the electrons surrounding them are long-lived particles present in all ordinary, naturally occurring atoms.
Why are some amino acids described as essential amino acids? They are the ones most used in the body. They can be stored in the body. They are the only ones needed by the body. They cannot be made by the body.
Essential amino acids are the amino acids which cannot be made by the body. Therefore, (d) is the correct answer.
Out of the 20 amino acids, 9 amino acids are essential amino acids - histidine, lysine, isoleucine, methionine, leucine, phenylalanine, valine, threonine, and tryptophan.
While your body may produce non-essential amino acids, it is unable to produce essential amino acids; therefore, you must obtain them from diet.
Animal proteins including meat, dairy, and poultry are the richest providers of essential amino acids. But certain plant meals, such edamame and tofu made from soy, do contain all nine essential amino acids. In other words, they are "complete" suppliers of protein.
Your body converts protein you consume into amino acids, which it then uses for a variety of functions including controlling immune response and constructing muscle.
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Broad areas of study
In FET colleges, there are six broad area of study: arts, business, education, engineering, management, and agricultural.
arts - study of musicCommerce includes marketing and bookkeeping.Education: Education and growthConstruction engineeringPrimary agricultural productionAdministration - HospitalityInstitutions offering Further education and Training (FET) are those that offer instruction and training to students in grades 10 through 12.
It also includes training that is efficient and career-focused that is provided by technical, community, and private universities.
arts - study of musicCommerce includes marketing and bookkeeping.Education: Education and growthConstruction engineeringMedical SciencesPrimary agricultural productionAdministration - HospitalityThe development of the nation's economy depends heavily on the education sector. The country would be more literate and educated if the kids are well-educated.To know more about FET
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CH3(CH2)12COOH
Write the total number of atoms on of that element in the compound.
The number of atoms of each element in one mole of the given compound is:
Number of C atoms = 7.826 * 10²⁴ C atomsNumber of H atoms = 1.685 * 10²⁵ H atomsNumber of O atoms = 1.204 * 10²⁴ O atomsWhat is the total number of atoms of each element in one mole of the compound, CH₃(CH₂)₁₂COOH?The total number of atoms of each element in one mole of the compound, CH₃(CH₂)₁₂COOH is determined as follows:
Number of atoms in one mole of atoms of an element = 6.02 * 10²³ atoms.
The number of moles of atoms of each element in one mole of the given compound is;
Carbon, C = 1 + 12 + 1 = 13 moles of C atoms
Hydrogen, H = 3 + 2 * 12 + 1 = 28 moles of H atoms
Oxygen, O = 2 moles of atoms of O
Number of atoms in 13 moles of C atoms = 13 * 6.02 * 10²³ atoms.
Number of atoms in 13 moles of C atoms = 7.826 * 10²⁴ C atoms
Number of atoms in 28 moles of H atoms = 28 * 6.02 * 10²³ atoms.
Number of atoms in 28 moles of H atoms of an element = 1.685 * 10²⁵ H atoms
Number of atoms in 2 moles of O atoms = 2 * 6.02 * 10²³ atoms.
Number of atoms in 2 moles of O atoms = 1.204 * 10²⁴ O atoms
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Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table.
Which of the following best describes property X?
The property X is an extrinsic property.
What is an extensive property?The term extensive property refers to the type of property that depends on the amount of the substance present. We must recall that an intensive property does not in any way depend on the number or the amount of the substance present in the sample.
If we have a good look at the table that is being referred to here, we would see that the mass of the substance tends to increase as a certain un named property of the substance X is increasing. This implies that the property X is affected by the mass of the object which is the quantity of matter in the object. This gives us an idea that the property that we are referring to can not be an intrinsic property since it varies with the mass of the substance that is under study as shown.
We can then conclude that the property X is an extrinsic property.
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Missing parts;
Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?
A. X is an intensive property because it does not vary with the size of the sample.
B. X is an extensive property because it does not vary with the size of the sample.
C. X is an extensive property because it varies directly with the size of the sample.
D. X is an intensive property because it varies directly with the size of the sample.
What is the solubility of k2so4 at 70oC
The solubility of k2so4 at 70oCis 100ml
From the curve, at 70°C temperature 50g of K2SO4 can be dissolved in 100 ml of H2O
K2SO4 produces 1 SO4(2-) ion and 2 K (+) ions. Therefore, the ratio of the number of ions generated following dissociation to the original number of molecules is known as the Van't Hoff Factor for K2SO4.KOH (potassium oxide) and H2SO4 are combined to create potassium sulphate (K2SO4) (Sulphuric Acid). K2SO4 is a neutral salt because KOH is a strong base and H2SO4 is a potent acid.The inorganic chemical with the formulaK2SO4 is a white, water-soluble solid that is also known as sulphate of potash (SOP), arcanite, or potash of sulfur in older terminology. It frequently provides both potassium and sulfur to fertilizers.To know more about K2SO4 visit:
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An atom of strontium has at least four different isotopes. What is different between
an isotope of Sr and an isotope of
86
87
Sr?
the number of protons in the nucleus
the number of neutrons in the nucleus
the size of the nucleus
the number of electrons in the atom
Answer:
B. the number of neutrons in the nucleus
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons
Answer:
the number of neutrons in the nucleus
Explanation:
Convert 7.6 cm3 to m3
Conversion of 7.6cm^3 to m^3 is 0.0000076m^3
Divide the volume by the conversion ratio to convert a cubic centimeter measurement to a cubic meter measurement. The cubic centimeters divided by 1,000,000 gives the volume in cubic meters.
The same attribute is expressed using a unit conversion, but in a different unit of measurement. For instance, time can be stated in minutes rather than hours, and distance can be expressed in kilometres, feet, or any other measurement unit instead of miles.
We need to convert between units in order to ensure accuracy and prevent measurement misinterpretation. For example, we do not measure a pencil's length in kilometers. In this situation, one must convert from kilometers (km) to centimeters (cm).
Conversion:
1m = 100cm
1m = 10^2cm
1cm = 10^-2m
1cm^3 = (10^-2)^3m^3
1cm^3 = 10^-6m^3
7.6cm^3 = 7.6 x 10^-6m^3
7.6cm^3 = 0.0000076m^3
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A very thin slice is removed from a peanut and treated with Sudan IV stain. Then a drop of Biuret Reagent is added to the peanut slice. When you examine the peanut slice under a microscope, patches of pink red and violet are visible. What conclusions can you draw from your examination
The conclusions that can be drawn from the examination is that peanuts contain lipids and proteins.
Where are Sudan IV and Biuret reagent used?Sudan IV is a dye used for staining of lipids ,triglycerides.The test making use of Sudan IV involves adding a few drops of Sudan IV to the solution containing lipids.
If no lipids are present in the sample ,the dye sinks at the bottom of the test tube.Positive test for Sudan IV involves the color of the reagent changing to red.
Biuret test is a chemical test used for detection of peptide bonds that is in turn proteins present in a sample.In the presence of proteins, it forms a violet color co-ordination complexes in alkaline range.
The test can be used for testing the concentration of proteins as peptide bonds occur along the same frequency per amino acid.
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there are ____ atoms are in every living thing
Answer:
There are carbon atoms in every living thing
what is the role of quantum chemistry IRL
Answer:
Quantum chemistry strives to accurately predict chemical and physical properties of molecules and materials, which is useful to many fields of science and engineering. Predicting chemical properties using a first principles approach at the atomic scale is a theoretical and computational challenge.
Explanation:
what is the difference between the number of electrons in an atom of calcium and the number of electrons in an atom of oxygen?
Use this information to calculate AGxn-
2C₂H₂(g) +50₂(g) →4CO₂(g) + 2H₂O(g)
AGCH₂=209.2 kJ/mol
AGE.co=-394.4 kJ/mol
AGHO-228.57 kJ/mol
AG
=
DONE
2,453.1
-1,616.7
-2,453.1
kJ
-1,616.7 kJ/mol
2C₂H₂(g) +50₂(g) →4CO₂(g) + 2H₂O(g)
AGC₂H₂=209.2 kJ/mol
AGE.co2=-394.4 kJ/mol
AG H2O-228.57 kJ/mol
AG 5O2 = ?
Now From the above given equation , we have got the enthalpy of no. of moles in reaction
4 moles of CO₂ contains = 4 -394.4 kJ/mol = -1577.6
2 moles of H₂O contains = 2 -228.57 kJ/mol = - 457
2 moles of C₂H₂ contains = 2 209.2 kJ/mol = +418.4
now putting all the values in equation
50₂(g) = 4CO₂(g) + 2H₂O(g) - 2C₂H₂(g)
50₂(g) = -1577.6-457-418
50₂(g) = -1,616.7 kJ/mol
The amount of heat that a system releases or absorbs during a chemical reaction is known as the enthalpy change. The symbol for it is HEnthalpy is measured in the same SI unit as energy, the joule. At constant pressure, the expression known as "enthalpy change" is computed or determined. It is impossible to measure a system's absolute enthalpy. As a result, the enthalpy change is measured. In endothermic processes, the change in enthalpy is positive, while in exothermic reactions, it is negative.To know more about Enthalpy visit : https://brainly.com/question/13775366
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