To find the edge length of a cube made of gold, divide the mass of the gold sample by its density and take the cube root of the result.
Explanation:The edge length of a sample of gold, if it is in the form of a cube, can be determined using the concept of density. The density of gold is 19.3 g/cm³. To find the edge length, we need to divide the mass of the gold sample by its density. For example, if the mass of the gold sample is 10 grams, the volume is 10 g / 19.3 g/cm³ = 0.52 cm³. Since the sample is a cube, all three dimensions are equal, so the edge length would be the cube root of the volume. In this case, the edge length would be approximately 0.8 cm.
3. What does Letter X and Y represent?
How many chlorine atoms are there in two calcium chloride formula units?
Answer Calcium chloride has the molecular formula [tex]CaCl_{2}[/tex] from which we can say that one molecule of calcium chloride consist of one atom of calcium and two atoms of chlorine.
given : 2 mol of [tex]CaCl_{2}[/tex]
total moles of chlorine atoms = number of atoms in one mole × number of formula units= 2×2= 4
Total number of atom = Total number of moles × Avogadro number
So, total number of chlorine atoms =
4 × 6.0221×[tex]10^{23}[/tex] =2.4088×[tex]10^{24}[/tex] atoms
A hydrogen halide diffuses 1.49 times faster than HBr. This hydrogen halide is
To solve this problem, we must assume ideal gas behaviour so that we can use Graham’s law:
vA / vB = sqrt (MW_B / MW_A)
where,
vA = speed of diffusion of A (HBR)
vB = speed of diffusion of B (unknown)
MW_B = molecular weight of B (unkown)
MW_A = molar weight of HBr = 80.91 amu
We know from the given that:
vA / vB = 1 / 1.49
So,
1/1.49 = sqrt (MW_B / 80.91)
MW_B = 36.44 g/mol
Since this unknown is also hydrogen halide, therefore this must be in the form of HX.
HX = 36.44 g/mol , therefore:
x = 35.44 g/mol
From the Periodic Table, Chlorine (Cl) has a molar mass of 35.44 g/mol. Therefore the hydrogen halide is:
HCl
Write out the rule for determining total magnification of a compound microscope
The rule for the determine of total magnification of an image is that:
When observing specimen with the aid of a microscope, you can get the amount of total magnification by using the power of the objective which exist in 4X, 10X, 40x form and multiply by the power of the ocular (eyepiece) which is often 10X.That is if ocular lens is: 10X (ocular) mutiplied by 4X (objective) = 40X will be the total magnification all togetherFor better understanding let's explain what the Total magnification means
Magnification is commonly referred to as the ratio of the size of a specimen (image) to the real size of that object Total magnification is simply known as what we get when objective lens is multiplied by the ocular lens. (e.g. 40x +10x = 400x)Note that in determining total magnification is done by the amount or number all together of the times a specific specimen that an individual is observing is magnified.Eyepiece is simply known to increase or magnifies a specific object.Objectives often exist in 4X, 10X, 40X and it simply increases or magnify the specimen size.From the above we can therefore say that the answer The rule for the determine of total magnification of an image is that:
When observing specimen with the aid of a microscope, you can get the amount of total magnification by using the power of the objective which exist in 4X, 10X, 40x form and multiply by the power of the ocular (eyepiece) which is often 10X.That is if ocular lens is: 10X (ocular) mutiplied by 4X (objective) = 40X will be the total magnification all together is correctLearn more about total magnification from:
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If measuring out 45 mL of water, it would be best to use _______________.
Select one:
a. a micropipette
b. a 50 mL graduated cylinder
c. a 10 mL graduate cylinder
d. a test tube
You are given 60 ml of 2.0 m naoh solution. how many ml of 6.0 m hcl solution is needed to completely neutralize the naoh solution? s
A sample of a compound containing only carbon and oxygen decomposes and produces 24.50g of carbon and 32.59g of oxygen. what is the sample?
Answer : The sample is, CO (carbon monoxide)
Solution : Given,
Mass of C = 24.50 g
Mass of O = 32.59 g
Molar mass of C = 12 g/mole
Molar mass of O = 16 g/mole
First convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{24.50g}{12g/mole}=2.04moles[/tex]
Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{32.59g}{16g/mole}=2.04moles[/tex]
Now for the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = [tex]\frac{2.04}{2.04}=1[/tex]
For O = [tex]\frac{2.04}{2.04}=1[/tex]
The ratio of C : O = 1 : 1
The mole ratio of the element is represented by subscripts in empirical formula.
The Empirical formula = [tex]C_1O_1[/tex] or, [tex]CO[/tex]
Therefore, the sample is, CO (carbon monoxide)
The sample is carbon monoxide, CO
To obtain the name of the sample, we shall determine the empirical formula of the compound. This can be obtained as follow:
Carbon (C) = 24.50 g
Oxygen (O) = 32.59 g
Empirical formula =? Divide by their molar massC = 24.50 / 12 = 2.04
O = 32.59 / 16 = 2.04
Divide by the smallestC = 2.04 / 2.04 = 1
O = 2.04 / 2.04 = 1
Thus, the empirical formula of the compound is CO.
The name of the CO is carbon monoxide.
Therefore, we can conclude that the sample is carbon monoxide, CO.
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Which subatomic particles are involved in chemical bonding? answee\rs.com?
How to tell which ionic bond is stronger bacl2 lif nabr or ki?
The hydrogen-line emission spectrum includes a line at a wavelength of 434 nm. What is the energy of this radiation? (h= 6.626 x 10 ⁻³⁴ J * 8 )
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How do chemicals combine and break apart inside living things
Answer:
-A lot of what happens in an organism is based on chemical reactions.
- Enzymes are proteins that speed up chemical reactions that take place in cells.
Explanation:
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If 200.0 g of glucose is fully converted, what will be the total mass of ethanol and carbon dioxide produced
Identify the product formed from the phosphorylation of adp.
Answer: Phosphorylation of ADP will lead to the formation of ATP.
Explanation:
The phosphorylation of ADP will lead to the formation of ATP. Phosphorylation can be defined as the chemical process by which the phosphorous is added to the adenosine di phosphate to convert it into adenosine tri phosphate.
This is a high energy molecules which provide energy for all the metabolic processes inside the body.
hence, phosphorylation of ADP will produce ATP.
What is the ph of a solution when the number of h+ ions equals the number of oh– ions in the liquid?
What are some problems chemist must consider when developing new technologies?
Final answer:
Chemists must consider economic costs, environmental impact, thermodynamic constraints, and societal demands when developing new technologies. They face challenges in optimization, scalability, safety, and compliance with environmental regulations. Embracing green chemistry practices is increasingly important for sustainable development.
Explanation:
When developing new technologies, chemists must consider a range of complex problems. These include the design and synthesis of new materials, creation of new fuels, fabrics, and foods at low cost, and finding eco-friendly solutions for waste disposal, air and water purification. They must be mindful of the constraints imposed by thermodynamics while meeting society's demands. Additionally, the development of instant drug therapies for diseases is another area of focus.
In the industrial sector, an industrial chemist prioritizes the cost of synthesis and the economic value of the molecules being developed. They strive for economical synthetic procedures that consider not only the cost of the chemicals but also waste treatment and environmental impact. This may involve overcoming challenges in scaling up reactions while ensuring reproducibility, safety, and cost-effectiveness.
Chemical engineers face the challenges of optimizing reaction conditions to avoid side-reactions and ensure high-quality products within pharmaceutical production and other industrial processes. They also deal with the development and design of facilities for chemical manufacturing with consideration for environmental, safety, and consumer welfare.
Finally, the responsibilities of chemists and chemical engineers now extend beyond traditional manufacturing concerns to include regulatory compliance, liability issues, and the incorporation of principles of green chemistry to reduce the use of hazardous materials and minimize environmental impact.
In a redox reaction what happens to a substance's charge when it is oxidized
What neutral atom has a atomic number of 15 and atomic mass of 31. 3 electrons are gained whats the result?
Which physical property refers to the temperature at which substance in a solid state transforms to a liquid state?
Answer:
Meltting point
Explanation:
Magma that is thick and viscous due to high Silica content is described as _____.
Question 1 options:
mafic
felsic
basaltic
pahoehoe
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Which methods could you use to calculate the y-coordinate of the midpoint of a vertical line segment with endpoints at (0, 0) and (0, 15)?
One of the most convenient ways of finding or calculating for the midpoint of the line segment is to get the average of the coordinates of the points.
Average of abscissa = (0 + 0) / 2 = 0
Average of ordinate = (0 + 15) / 2 = 7.5
Hence, the midpoint of the line segment is equal to (0, 15/2).
The value of the y-intercept is 15/2.
Answer : The y-coordinate of the midpoint of a vertical line segment is, 7.5
Step by step explanation :
The method used to calculate the y-coordinate of the midpoint of a vertical line segment is, Mid-point formula.
If a line segment AB with endpoints at [tex](x_A,x_B)[/tex] and [tex](y_A,y_B)[/tex]
The mid-point formula will be,
[tex]M=(\frac{x_A+x_B}{2},\frac{y_A+y_B}{2})[/tex]
Now we have to calculate the x-coordinates and y-coordinates.
The given endpoints are, (0, 0) and (0, 15)
[tex]x_A=0,x_B=0\\\\y_A=0,y_B=15[/tex]
[tex]M=(\frac{x_A+x_B}{2},\frac{y_A+y_B}{2})[/tex]
[tex]M=(\frac{0+0}{2},\frac{0+15}{2})=(0,7.5)[/tex]
The x-coordinate of the midpoint of a vertical line segment is, 0
The y-coordinate of the midpoint of a vertical line segment is, 7.5
Therefore, the y-coordinate of the midpoint of a vertical line segment is, 7.5
How do you increase the concentration of a solution wiki?
Which of the following procedures involves a physical change in one of the substances?
A. creating salt by reacting sodium metal and chlorine gas
B. allowing a nail to rust
C. building a model rocket propelled by mixing baking soda and vinegar
D. Separating a salt solution by evaporating the water
Answer:
D. Separating a salt solution by evaporating the water
Explanation:
B. Allowing a nail to rust is a chemical change.
Becuase once the nail rust it turns into flakes and therefore is no longer a nail.
C. building a model rocket propelled by mixing baking soda and vinegar
By mixing baking soda (a powder) into vinegar ( a Acid) it causes a explosion...
the baking soda dissolve into the acid.... This a chemical reaction
A.creating salt by reacting sodium metal and chlorine gas
Sodium is salt but it says.... Sodium metal..... chlorine gas Changes color and it has a strong odor... chlorine gas with sodium metal turns it into salt.... it doesnt stay a metal or a gas it CHANGES.....
so therefore its a Chemical change
When A object or substance changes form or it causes a exsplosion or reaction it is a chemical change.
D. Separating a salt solution by evaporating the water
For a physical change your object may change color or shape but its still the same object.
salt in water ... The salt dont dissolve it just salty water.
So seperating salt by evaporating the water is a physical change.
The answer is separating a salt solution by evaporating the water
A physical change can be described as a change that cannot be reversed. In a physical change, there is no creation of a new substance. Although there may be a slight change in the matter, size, color or shape of the compound that is undergoing this change. In this type of change(physical change) the physical part/appearance of the compound might change but this does not in any way affect the chemical composition of the substance.
These options listed below are not examples of a physical change;
- creating salt by reacting sodium metal and chlorine gas
- allowing a nail to rust
- building a model rocket propelled by mixing baking soda and vinegar
Hence the example of physical change in the option is;
Separating a salt solution by evaporating the water
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What happens to starch at a molecular level when it is acted upon by amylase?
What is a characteristic of chemical equilibrium but not physical equilibrium?
Answer:
Concentration of reactants and products
Explanation:
The difference between physical and chemical equilibrium is: A physical equilibrium represents the state in which physical state of the system is preservedOn the other hand chemical equilibrium represents the state in which concentrations of reactants and products is not changed with time.Name two elements that have properties similar to those of beryllium and have average atomic masses higher than 130
Final answer:
Barium and strontium are two elements with properties akin to beryllium and atomic masses greater than 130.
Explanation:
Two elements that have properties similar to beryllium and atomic masses higher than 130 are barium and strontium. Both barium and strontium belong to the alkaline earth metals group and exhibit similar chemical properties to beryllium.
choose the species with 15 protons and 18 electrons
Mendeleev left several blank spaces in his original periodic table. what did those spaces represent? elements with unknown physical properties elements that did not fit into his pattern elements that had yet to be discovered elements with variable atomic masses
Answer:
these blank spots represented elements that had yet to be discovered.
Which substance can be decomposed by chemical means?
1. Aluminum
2.octane
3.silicon
4.xenon
Answer:
octane
Explanation:
bc it is
Substance which can be decomposed by chemical means is octane.
What are decomposition reactions?
Decomposition reactions are reactions where in the compound or molecule taking part in the chemical reaction is broken down in to its constituents elements which are present in the compound. It is the opposite of combination reaction.
Decomposition reaction are of three types:
1) Thermochemical decomposition
2)Electrolytic decomposition
3)Photolytic decomposition
Among the given substances, the three mentioned are elements which cannot be broken into further substances.Thus,aluminium,xenon and silicon which are elements cannot be decomposed further.
Octane is a compound with a chemical formula C₈H₁₈ composed of 8 carbon atoms and 18 hydrogen atoms. As it is a compound it is decomposed into methane, ethane and hydrogen gas.
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How many dots should be indicated in the electron dot structure of arsenic
There should be 5 dots indicated in the electron dot structure of arsenic.
Arsenic is a chemical element with the symbol As and atomic number 33. It is a post-transition metal in the periodic table and is chemically similar to its group neighbours sulfur and phosphorus.
The electron dot structure of arsenic is a representation of the valence electrons of the arsenic atom. The valence electrons are the electrons that are found in the outermost shell of the atom. They are the electrons that are involved in chemical bonding.
The atomic number of arsenic is 33, which means that there are 33 protons in the nucleus of an arsenic atom. The number of electrons in a neutral atom is equal to the number of protons in the nucleus. This means that there are also 33 electrons in a neutral arsenic atom.
The electron configuration of arsenic is [Ar] 3d¹⁰ 4s² 4p³. This means that the outermost shell of arsenic has 5 electrons. The 3d¹⁰ electrons are filled, and the 4s² 4p³ electrons are the valence electrons.
The 5 valence electrons of arsenic are represented by 5 dots in the electron dot structure. The dots are arranged around the arsenic atom in a trigonal pyramidal shape.
The electron dot structure of arsenic is important for understanding the chemical properties of arsenic. The valence electrons of arsenic are involved in chemical bonding, and the shape of the electron dot structure affects the reactivity of arsenic.
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All of the atoms making up any given element have the same number of ________.
Every element has a variable number of protons in its atoms, yet every element has the same number of protons in all of its atoms. For instance, all helium atoms have two protons; such atoms do not exist in any other element.
What are the number proton in an atom shows?The number of protons in the atom's nucleus is equal to the atomic number (Z). There are exactly as many electrons as protons in a neutral atom.
The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom.
The atomic number of an element is determined by the quantity of protons it contains in its nucleus.
To put it another way, every element has a special number that indicates how many protons are contained in each of its atoms.
Therefore, All the atoms making up any given element have the same number of proton.
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