A chemical element with the atomic number 4 and the symbol Be is known as beryllium. It is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of beryllium.
Any element's atomic number indicates how many protons or electrons are found in that element.
Since beryllium has an atomic number of 4, it is obvious that it contains 4 protons and 4 electrons.
On the other hand, the mass number of an element denotes the total number of protons and neutrons that make up an element's atomic nucleus.
Since beryllium has a mass of nine, there are also nine protons and neutrons in its mass.
Thus, there are 9 - 4 = 5 neutrons in the system.
As a result, there are 4, 4, and 5 protons, electrons, and neutrons present in beryllium, respectively.
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13. Practice: You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the
same direction. What is the net force applied on the car?
Show your work:
Solution:
You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same direction and the net force is 45N.
Net force = 20 N + 25 N
Net force = 45 N.
What is force?Force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. The SI unit of force is Newton(N).
The Force has different effects:
Force can make a body that is at rest to move.It can stop a moving body or slow it down.It can accelerate the speed of a moving body.It can also change the direction of a moving body along with its shape and size.To learn more about force, refer;
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A scientist proposes that an iron bar be divided into smaller and smaller pieces. what occurs during this process? select the words from the drop-down menus to correctly complete the explanation. eventually, the process produces an iron choose... . this is the smallest piece of the iron choose... . smaller pieces choose... the properties of iron.
A scientist proposes that an iron bar be divided into smaller and smaller pieces it is right to infer that during this process, the process produces, the smallest piece of the iron (Option A)
What is Iron?Iron has the chemical symbol Fe and the atomic number 26. It is a metal from the periodic table's first transition series and group 8. It is the most common element on Earth by mass, just ahead of oxygen, and makes up much of the Earth's outer and inner core.
Alloy steels, such as carbon steels, are made using iron plus additions such as nickel, chromium, vanadium, tungsten, and manganese. Bridges, power pylons, bicycle gears, cutting tools, and rifle barrels are all made from them. Carbon content in cast iron ranges from 3-5%. It is utilized in the manufacture of pipes, valves, and pumps.
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A standard solution of sodium carbonate was prepared by dissolving 10.6 g of the anhydrous salt in distilled water. The solution was then transferred to a standard flask and the total volume was adjusted to the 500 mL mark.Calculate the concentration of the sodium carbonate solution in mol/L.
ANSWER
The concentration of the solution is 0.2 mol/L
EXPLANATION
Given that;
The mass of sodium carbonate dissolved is 10.6 grams
The volume of the flask is 500mL
Follow the steps below to find the concentration of the solution
Step 1; Find the number of moles of the solute using the below formula
[tex]\text{ mole = }\frac{\text{ mass}}{\text{ molar mass}}[/tex]Recall, the molar mass of sodium carbonate is 106 g/mol
[tex]\begin{gathered} \text{ mole = }\frac{\text{ 10.6}}{\text{ 106}} \\ \text{ mole = 0.1 moles} \end{gathered}[/tex]The moles of sodium carbonate is 0.1 moles
Step 2; Convert the volume to liters
Let x represents the volume of the flask in liters
[tex]\begin{gathered} \text{ 1mL }\rightarrow\text{ 0.001L} \\ \text{ 500mL }\rightarrow\text{ xL} \\ \text{ cross multiply} \\ \text{ 1mL }\times\text{ xL = 0.001L }\times\text{ 500mL} \\ \text{ Isolate xL} \\ \text{ xL = }\frac{\text{ 0.001L }\times500\cancel{mL}}{1\cancel{mL}} \\ \text{ xL = 0.001}\times\text{ 500} \\ \text{ xL = 0.5L} \end{gathered}[/tex]The volume of the flask is 0.5L
Step 3; Find the concentration of the solution
[tex]\begin{gathered} \text{ Concentration = }\frac{\text{ 0.1}}{\text{ 0.5}} \\ \text{ concentration = 0.2 mol/L} \end{gathered}[/tex]Therefore, the concentration of the solution is 0.2 mol/L
Convert 7.3x10^-3 kg to mg
7300 mg
Explanation:7.3x10^-3 kilograms = 7300 milligrams
what change will be caused by the addition of a small amount of oh- to a solution containing large amount of a- and ha?
Concentration of A increases and Concentration of HA decreases.
What is buffer solution?The buffer solution, a water-based solvent solution, is created by combining a weak acid and its conjugate base, or a weak base and its conjugate acid. They can be diluted or have small amounts of acid or alkali added to them without the pH of the solution altering.
If small amount of OH⁻ is added to a buffer solution containing A and HA, this added OH⁻ will react
with the HA in following way,
HA + OH = A + H₂O
as a result more amount of A will generate and along with that amount of HA will decrease.
Hence we can say,
Concentration of A increases and Concentration of HA decreases . OPTION B is correct.
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Compared to the atom of calcium -40, an atom of potassium - 39 contains fewer ______,
Protons (the number on the right of calcium-40 represents number of protons). The tiniest component of ordinary matter, an atom, makes up a chemical element.
Neutral or ionized atoms make up every solid, liquid, gas, and plasma. Atoms typically have a diameter of 100 picometers or less. Due to quantum effects, they are so small atoms that it is impossible to precisely anticipate their behavioral using traditional physics, as if they were tennis balls, for example.
The positively charged particles called protons are found in the hydrogen atom's nucleus. Protons, electrons, and neutrons are the building blocks of an atom. An atom's nucleus, which is located in the middle, contains all of its mass.
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what is the empirical formula of a compound is a sample contains 2 g of hydrogen, 32 g of sulfur, and 64 g of oxygen?
According to the given statement HSO₄ is the empirical formula of a compound.
Why is the empirical formula important?Empirical formulae are beneficial since figuring out the molecular formula can be immensely aided by knowing the relative amounts of each constituent in a molecule. Obtaining an n-value is crucial in order to establish the actual number of atoms in a molecule.
Briefing:Hydrogen = 2 g
Sulphur (S) = 32 g
Oxygen (O) = 64 g
We know, molecular weight of the elements:
H = 2 g/mol
S = 32 g/mol
O = 16 g/mol
This allows us to calculate how many moles there are for each element.
⇒ Moles
= Weight (g) / Molecular weight (g/mol)
For Hydrogen:
⇒ Moles of H = 2/2
⇒ Moles of H = 1 mol
For Sulphur:
⇒ Moles of S = 32/32
⇒ Moles of S =1 mol
For Oxygen:
⇒ Moles of O = 64/16
⇒ Moles of O = 4 mol
To determine the empirical formula, we shall divide the element with the fewest moles by the other elements' moles.
Here, the smallest moles are of Hydrogen and Sulfur i.e. 1 mol
⇒ H = 1/1
⇒ H = 1
⇒ S = 1/1
⇒ S = 1
⇒ O = 4/1
⇒ O = 4
⇒ Empirical formula = HSO₄
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Answer: The correct answer is H2SO4. the other guy is wrong.
Explanation: First, you must convert grams to moles using the molar mass of each element.
2 g H×1 mole H1.008 g H=2 moles H32 g S×1 mole S32.006 g S=1 mole S64 g O×1 mole S15.99 g O=4 mole O
Second, you divide your calculated moles by the smallest mole to get whole-number ratios. Since Sulfur (S) has the smallest amount of moles (1) we will divide by that number.
H=21=2S=11=1O=41=4
So your final answer is H2SO4.
What is the concentration of a solution made by diluting 25 ml of 6. 0 m hcl to a final volume of 750 ml?.
The concentration of the solution will be 0.2 M.
Given information,
Initial Volume [V1] = 25 ml
Initial Volume in litre = 25/1000 L
= 0.025 L
Initial Concentration [M1] = 6 M
Final Volume [V2] = 750 ml
Final Volume in litre = 750/1000 L
= 0.75 L
Let final Concentration = [M2]
Using the dilution equation, that is
Initial Molarity x Initial Volume = Final Molarity x Final Volume
M1 x V1 = M2 x V2
6 x 0.025 = M2 x 0.75
0.15 = 0.75M2
∴ M2 = 0.2 M
Therefore the concentration of the solution after the dilution process is 0.2M compared to the initial 6M HCl.
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What is nebular theory
Answer: The nebular theory is an explanation for the formation of solar systems.
Explanation:
Which of the following examples is a way to live sustainably?
Responses
Drive your car as much as possible.
Have a nice green, fertilized lawn.
Recycle and reuse materials.
Leave computer screens and light bulbs on.
The example 'recycle and reuse materials' is a way to live sustainability because it involves the use of old materials instead of obtaining new ones (Option 3).
What is recycling?The expression recycling is used to denote the reuse of material with different purposes, which involve the absence of extraction techniques that may be harmful to the environment and therefore promote sustainability.
Therefore, with this data, we can see that recycling is an excellent manner to maintain the sustainability objective in order to reduce the need to obtain more and more material from nature.
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The molecule beryllium chloride has one beryllium atom, a metal, and two chlorine atoms, nonmetals. what kind of bond will they form?(1 point) responses beryllium and chlorine will form an ionic bond where one beryllium atom will donate electrons to two chlorine atoms. beryllium and chlorine will form an ionic bond where one beryllium atom will donate electrons to two chlorine atoms. beryllium and chlorine will form an ionic bond where two chlorine atoms will donate electrons to one beryllium atom. beryllium and chlorine will form an ionic bond where two chlorine atoms will donate electrons to one beryllium atom. beryllium and chlorine will form a covalent bond where one beryllium atom will share electrons with two chlorine atoms. beryllium and chlorine will form a covalent bond where one beryllium atom will share electrons with two chlorine atoms. beryllium and chlorine will form a covalent bond where two chlorine atoms will share electrons with one beryllium atom.
The kind of bond they will form is an ionic bond where one beryllium atom will donate electrons to two chlorine atoms (option A).
What is an ionic bond?Ionic bond is a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.
Ionic bonds are formed by atoms with opposite charges i.e. negative (-) and positive (+) charge. The metal is usually positively charged while the nonmetal is usually negatively charged.
According to this question, the molecule beryllium chloride has one beryllium atom, a metal, and two chlorine atoms, nonmetals. This means that an ionic bond will be formed by beryllium atom and chlorine atom.
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help please !! did i do it right??
Answer: The correct answer is 72.0726, so you have chosen correctly!
Explanation:
The carbon weight of C14 is 168g
The total mass (molar weight) of C14H19NO2 is 233g
Therefore, the percent carbon would be 168/233 = 0.721 or 72.1%
37. Between 02, SO, and H20, which would have the highest vapor pressure? *Helppppp
First, remember that:
The vapor pressure of a liquid is directly related to the intermolecular forces present between its molecules. If these forces are stronger, the evaporation rate and the vapor pressure will be lower.
So, we're going to analyze the intermolecular forces of each element:
O2: The molecule of oxygen consist of two oxygen atoms bonded together by a double bond. It consist of just London dispersion forces, so this is a really weak force.
H2O: Water has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces. So it has strong forces.
SO: It consists of London dispersion forces, and there's a difference of electronegativity between S and O, so there's a greater force than the force of O2.
Therefore, O2 could have the highest vapor pressure, as its intermolecular forces are the weakest.
I need help with this science question
Answer:
c Draw Ernest Rutherford atomic model
Explanation:
How many moles are in 28 grams of carbon dioxide CO2
Answer:
0.636 moles
Explanation:
Complete answer:
Complete answer:The molecular weight of a material is required to tell an individual how many grams there are in one mole of that chemical substance i.e. molecular weight of any substance contains 1 mole of that substance. Then 28 g of $C{{O}_{2}}$ contains = 0.636 moles of $C{{O}_{2}}$.
At the equivalence point of a strong acid-strong base titration, all of the acid and base have reacted producing water and a salt. What affects the ph at this point in the titration?.
The self-auto ionization affects the pH at the titration and is greater than 7
Strong acid and strong base completely suppress the effect of each other upon arriving at the equivalence point. The salt of strong acid and strong base neither gets hydrolyzed to furnish any mother acid or base because in this case, the acid-base equilibrium strongly favors the product. So, neither cation nor anion influences the pH of the neutralization point, and thus, it is only governed by the self-ionization of water. So, the correct option is the auto-ionization of water.It produced an alkaline that is susceptible and the pH of the equivalence factor will be higher than 7.Therefore the solution generated is just marginally alkaline, therefore the equivalence point's pH will be higher than 7.To learn more about equivalence point visit:
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The energy that is released in the hydrogen fusion reaction comes from __________.
How did fossil fuels get there name
Answer:
Explanation:
Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.
the hydrologic cycle is the movement of ____. group of answer choices carbon carbohydrates water hydrocarbons hydrogen
The hydrologic cycle is the movement of water.
Water can recycle itself in the water cycle which is called the hydrologic cycle.
This cycle can be considered to start from the evaporation of water from the ocean's surface, making the air moist. As this moist air is lifted it cools and the water vapor condenses. It then forms clouds; in fact, clouds are made from tiny water droplets and ice crystals that are so small that they can float in the air.
The moisture in the atmosphere can also be transported around the globe until it returns to the surface as precipitation. Precipitation may take the form of rain, snow, sleet, or hail. Once the water reaches the ground, water may evaporate back into the atmosphere, or the water may penetrate the surface and become groundwater.
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Jam in a jar has a mass of 91grams and a volume of 65cubic centimeters. Calculate its density. Write your answer to the tenths place. gramspercubic centimeter
Taking into account the definition of density, the density of the jam in the jar is 1.4 g/cm³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density of jamIn this case, you know that:
Mass= 91 gVolume= 65 cm³Replacing in the definition of density:
density= 91 g÷ 65 cm³
Solving:
density= 1.4 g/cm³
In summary, the density is 1.4 g/cm³.
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If a measurement is 23.895 m, which digit is the uncertain number?
2
8
9
5
Answer:
5 is the uncertain number
n is known as the principal quantum number. ... l is known as the orbital quantum number. ... ml is known as the magnetic quantum number. ... n specifies l specifies ml specifies ... a. the subshell - orbital shape. b. the energy and distance from the nucleus. c. the orbital orientation.
The first shell of an atom is its electron shell, or energy level.
The subshell is the second shell.
The particular orbital (or "cloud") within that subshell is the third shell.
What are Quantum Numbers?The position and energy of an electron in an atom are represented by a set of numbers known as quantum numbers.
principal quantum number
azimuthal quantum number
magnetic quantum number
The electron shell, also known as the atom's energy level, is the initial shell. The value of N ranges from 1 to the atom's outermost electron's shell.
By using the connection, the second shell, which is the subshell, determines the magnitude of the orbital angular momentum.
The third shell creates the orbital angular projection momentum along a certain axis and is the particular orbital (or "cloud") within that subshell.
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explain the difference in boiling points between water and methane in terms of intermolecular forces present
Answer:
Water has a much higher boiling point than methane because the hydrogen bonds in water have a much stronger intermolecular force than that of methane.
Which quantity must be determined experimentally in order to determine the bonding atomic radius of an atom?.
Only by measuring the separation between the nuclei of two contacting atoms and halving that distance can one determine the radius of an atom. The illustrations show how the environment around an atom can cause it to have a varied radius, even if it is the same atom.
How can the atomic size of an element be determined?By measuring the distance between the two atoms after two are united, we may determine the atomic size of the new molecule. The third technique for determining an element's atomic size is to create a single covalent link between two atoms and measure the space between them.
Atomic radii in the periodic table change from left to right across a row and from top to bottom along a column. Because of these two patterns, the periodic table's bottom left corner contains the biggest atoms, while the upper right corner has the smallest.
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True or False:In a chemical reaction,atoms of elements cannot be present in the product if they were not present in the reactants
Answer:
False
Explanation:
It is False because in a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
identify the following reaction as an endothermic reaction, exothermic reaction, or both endothermic and exothermic: evaporation of water from your skin
The evaporation of water from your skin is an example of an endothermic reaction because heat is lost from the body as the water evaporates from the skin.
What are exothermic and endothermic reactions?Based on the heat changes that occur in reaction, reactions can be classified into two types;
endothermic reactions, andexothermic reactionsExothermic reactions are reactions in which the heat content of the reactants is greater than the heat content of the products. Hence, heat is given out during the reaction. An example is the dissolution of acids in water.
Endothermic reactions are reactions in which the heat content of the reactants is less than the heat content of the products. Hence, heat is absorbed during the reaction. An example is the evaporation of water from the skin.
Other types of endothermic reactions are the melting of ice and thermal decomposition.
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How many moles are in 35 grams of NaCl
The 0.59 moles of NaCl are present in 35grams of NaCl.
What do you understand by moles?
Chemists employ the mole, as a very significant unit of measurement.
Given:
The given mass of NaCl = 35 gram
The molar mass of NaCl = 58.44 g/mol
By applying the mole's formula = moles = Given mass/molar mass
Moles = 35/58.44 = 0.59 moles
Hence, the answer is 0.59 moles of NaCl
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which properties of a system would determine whether vacancy or interstitial diffusion is more likely?
The size of the particles decides whether vacancy or interstitial diffusion is more likely.
In vacancy diffusion, the atoms moves in a particular direction and the vacancies are filled and new vacancies are created on the places of the atoms.
While in Interstitial diffusion, the atoms moves inside the lattice of the structure of the crystals.
Interstitial diffusion is faster than vacancy diffusion because it is easier to move inside the lattice, and if the size of the atom is small, it will prefer interstitial diffusion over vacancy diffusion. So, smaller the size of the atoms, faster is the rate of interstitial diffusion.
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explain the difference in boiling points between water and methane in terms of intermolecular forces present
Answer: Water has a higher boiling point than methane. Water has a higher boiling point because water molecules have hydrogen bonds, which means MUCH STRONGER intermolecular forces, than methane.
Methane and water have different boiling points. Because water molecules have hydrogen bonds, which equate to much stronger intermolecular interactions than methane, water has a higher boiling point than methane.
What is the boiling point?The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.
An O-H bond has a bigger bond dipole than a C-H bond because oxygen is more electronegative than carbon. As a result, there is a stronger force of attraction between two water molecules than between two methane molecules.
Therefore, the boiling points of water and methane are dissimilar. Water has a greater boiling point than methane because water molecules have hydrogen bonds, which translate to far stronger intermolecular interactions.
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chemist: matter :: which pair of words has the same relationship to one another as chemist and matter have to one another? responses motor: machine motor: machine astronomer: space astronomer: space oceans: fish oceans: fish animals: zoo
All the pair of words given have the same relation as chemist has with matter.
What is matter?
Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.
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Answer: Astronomer: Space
Explanation:
K12 2.18 Unit Test
