Answer:
Density=mass / volume.
0.75= mass / 120.
mass= 0.75×120.
mass=90g
When 10.0 g of lead are heated with 1.6 g of sulfur, 11.6 g of lead sulfide are formed. how many grams of lead sulfide form when 10.0 g of lead are heated with 3.0 g of sulfur?
What neutral atom has a atomic number of 15 and atomic mass of 31. 3 electrons are gained whats the result?
3. What does Letter X and Y represent?
In naming a binary molecular compound the number of atoms of each element present in the molecule is indicated by
Answer:
Using prefix before the name of each element
Explanation:
When naming a binary compound the number of atoms is represented by a prefix before the name of the element.
For example:
In CO2, the name is carbon dioxide (prefix di- meaning 2)In CCl4, the name is carbon tetrachloride (prefix tetra- meaning 4) In N2O5, the name is dinitrogen pentoxide (prefix di- and pent- meaning 2 and 5)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
what is part of every cell
choose the species with 15 protons and 18 electrons
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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The Milky Way is classified as a ______ galaxy.
Spiral galaxy
Explanation;Spiral galaxy is among the three major types of galaxies, the others being elliptical galaxy and irregular galaxy.Spiral galaxies are twisted collection of stars and gas with beautiful shapes often made up of hot young stars.They contain a central bulge surrounded by a flat, rotating disk of stars.The stars, gas and dust are gathered in spiral arms that spread outward from the galaxy's center.The milky way is a spiral galaxy that includes Earth and our solar system .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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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.Evidence about Dalton's atomic theory has shown that A. all of Dalton's hypotheses were correct. B. atoms of an element can have different numbers of protons. C. atoms are divisible. D. all atoms of an element are not identical but they must all have the same mass.
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
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
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.
for an endothermic reaction, which of the following conditions must be true for all products
The Answer is: The change in enthalpy is negative and potential energy diagram is lower.
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:
Have a good day (:
Did I do this right?
Answer:
Looks good :)
Explanation:
Which subatomic particles are involved in chemical bonding? answee\rs.com?
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.
What happens to starch at a molecular level when it is acted upon by amylase?
Which physical property refers to the temperature at which substance in a solid state transforms to a liquid state?
Answer:
Meltting point
Explanation:
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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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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How many grams of koh would be needed to produce 5.00 moles of k2so4?
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.
An experiment requires 42.5 g of sulfuric acid, which is easier to measure by volume than by mass what voliume should be measured out if the denstiy of the sulfuric acid is 1.84
Using proportions,
if x is the unknown volume we have:
1.84 / 1 = 42.5 / x
Multiply both sides above by x:
1.84*x / 1 = 42.5
1.84*x = 42.5
Divide both sides by 1.84:
x = 42.5 / 1.84
X = 23.10 mL
Answer:
The volume of liquid is 23.098 mL.
Explanation:
To calculate mass of a substance, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
We are given:
Density of sulfuric acid= 1.84 g/mL
Mass of sulfuric acid =42.5 g
Putting values in above equation, we get:
[tex]1.84 g/mL=\frac{42.5 g}{\text{Volume of liquid}}\\\\\text{Volume of liquid}=15.13mL[/tex]
Hence, the volume of liquid is 23.098 mL.
An atom's nucleus has 92 protons and its mass number is 235. how many neutrons are in the nucleus? what is the name of the atom
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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