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 .What neutral atom has a atomic number of 15 and atomic mass of 31. 3 electrons are gained whats the result?
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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Water is an example of a compound that is held together by what bonds
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.
What is released when an electron loses energy?
According to the concept of emission spectrum, when an electron looses energy it releases a photon of equivalent energy.
What is emission spectrum?Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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Which subatomic particles are involved in chemical bonding? answee\rs.com?
what is part of every cell
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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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?
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.
A molecule of common table salt, or nacl, is the result of _____ bond forming between a sodium (na) atom and a chlorine (cl) atom.
Table salt (NaCl) is made as a result of an ionic bond between sodium (Na) and chlorine (Cl). Sodium loses an electron and becomes a positive ion, while Chlorine gains this electron and becomes a negative ion. This creates an ionic bond which holds the atoms together.
Explanation:A molecule of common table salt, or NaCl, results from an ionic bond forming between a sodium (Na) atom and a chlorine (Cl) atom. In this bonding, sodium (Na), which is a metal, loses an electron and becomes a positively charged ion. On the other hand, Chlorine (Cl), a non-metal, gains this electron and becomes a negatively charged ion. This opposite charge is what holds the two atoms together in an ionic bond. This is a common characteristic of compounds formed from metals and nonmetals.
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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
Did I do this right?
Answer:
Looks good :)
Explanation:
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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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 the mass of 5.30×1021 platinum atoms?
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.
What is the volume of 13.5 g of a liquid that has a density of 0.892 g/ml?
Answer: The volume of liquid is 15.13 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 liquid = 0.892 g/mL
Mass of liquid = 13.5 g
Putting values in above equation, we get:
[tex]0.892g/mL=\frac{13.5g}{\text{Volume of liquid}}\\\\\text{Volume of liquid}=15.13mL[/tex]
Hence, the volume of liquid is 15.13 mL
choose the species with 15 protons and 18 electrons
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.
What are the 4 indications of a chemical change?
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 physical property refers to the temperature at which substance in a solid state transforms to a liquid state?
Answer:
Meltting point
Explanation:
star: a object made of gas found in outer space that radiates
A star is a celestial object made of gas that radiates light and heat due to the fusion of hydrogen nuclei into helium. Not all celestial objects are stars; for example, brown dwarfs are too 'cool'. Stars exist in various stages including protostars (stars in formation) and planetary nebulas (stars near the end of their lifecycle).
Explanation:A star is a celestial object made of gas that radiates light and heat. This radiation is due to the fusion of hydrogen nuclei into helium, a process that engaged throughout much of a star's lifetime. Stars are a central object found in space and form an integral component of galaxies, including our very own Milky Way.
However, not all celestial objects that emit light and/or heat are stars. For instance, Spectral Classes L, T, and Y comprise objects that are too cool to be considered stars because they don't possess the necessary heat for hydrogen fusion to occur. These are often called brown dwarfs.
Stars exist in a variety of stages and forms. For instance, A Planetary Nebula is a stage of a star near the end of its lifecycle, during which it ejects a shell of gas that expands away from the star. On the other hand, Protostars are stars in their formation stage. These objects often emit infrared radiation due to being embedded in an envelope of dust and gas.
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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.
How many grams of koh would be needed to produce 5.00 moles of k2so4?
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
Mole-Atom Conversions
1. How many moles are 1.55 x 1027 atoms of Zinc (Zn)?
2. How many atoms are in 25.0 moles of calcium (Ca)?
3. How many atoms are in 0.35 moles of carbon (C)?
4. How many moles are 7.6 x 1024 atoms of Helium?
Mole-Mass Conversions
How many moles in 28.o grams of Oxygen?
What is the mass of 5.0 moles of Iron?
Find the number of moles of argon in 452 g of argon.
Find the grams in 16.5 mol of Hydrogen.
.
The answers to the mole-atom and mole-mass conversions are as follows:
2.6 × 10³ moles of Zinc1.51 × 10²⁵ atoms of Ca2.11 × 10²³ atoms of C12.6 moles of He1.75mol280g of Fe11.33mol of Argon16.5grams of HHOW TO CALCULATE MOLE-ATOMS QUESTIONS?Mole-atom questions can be calculated using the following expression;
no. of atoms = no. of moles × 6.02 × 10²³
QUESTION 1:
Number of moles in Zinc is calculated as: 1.55 x 10²⁷ atoms ÷ 6.02 × 10²³
= 2.6 × 10³ moles of Zinc.
QUESTION 2:
The number of atoms in 25 moles of Calcium is 25 × 6.02 × 10²³
1.51 × 10²⁵ atoms of Ca.
QUESTION 3:
The number of atoms in 0.35 moles of carbon (C) is 0.35 × 6.02 × 10²³
2.11 × 10²³ atoms of C
QUESTION 4:
The number of moles in 7.6 x 10²⁴ atoms of Helium is 7.6 × 10²⁴ ÷ 6.02 × 10²³
= 1.26 × 10¹ = 12.6moles of He.
QUESTION 5:
The number of moles in 28.0 grams of oxygen is 28g ÷ 16g/mol = 1.75mol
QUESTION 6:
The mass of 5.0 moles of Iron (Fe) is 5moles × 56g/mol = 280g
QUESTION 7:
The number of moles of argon in 452g of argon is 452g ÷ 39.9g/mol = 11.33mol
QUESTION 8:
The grams in 16.5 mol of hydrogen is 16.5mol × 1 = 16.5grams.
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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)