Answer:
1: X and Y
2: A
Explanation:
Which pair must represent atoms of the same element?
Answer nuber 3
Explanation:
If 5. 00 g of gas a and 5. 00 g of gas b are mixed in the same container, and the partial pressure of gas b is determined to be twice that of gas a, what do we know about the gases?.
The partial pressure of each gases is dependent on the mole fraction of the gases. If gas b has higher partial pressure than the a , then the number of moles of b will be higher in the container.
What is partial pressure?Partial pressure of an individual gas in a mixture of gases is the contribution of that gas to the total pressure of the gas mixture. Thus if Pa be the partial pressure of gas A and Pb is the partial pressure of gas b, then the total pressure of mixture AB will be Pa + Pb.
Given that the two gases a and b are taken in a container 5 g each. The partial pressure of b is twice that of a. Thus,
Pb = 2 Pa. and total pressure = Pa + 2Pa = 3Pa
Here, the mass, volume and temperature all equal for the two gases, however their partial pressure differs and it is due to the difference in number of moles . Thus the mole fraction of gas b will be grater than that of gas a.
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Which one is a single replacement reaction? (Whoever gets it correct first I’ll mark)
The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)
What is a single replacement reaction?A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.
The following example illustrates single replacement reaction:
A + BC -> AC + B
From the above reaction, we can see that A has replace/displace B to from AC.
With the above information, we can determine the equation that represents single replacement reaction. Details below:
Equation from the questions:
2Al + 3Cl₂ -> 2AlCl₃2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g)2AlCl₃(aq) -> 2Al + 3Cl₂ AlCl₃ + 3KOH -> Al(OH)₃ + 3KClFrom the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.
Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)
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Indicate whether the O2- is a cation or anion and the correct electron configuration for that ion.
A) Cation, 1s22s22p6
B) Anion, 1s22s22p3
C) Anion, 1s22s22p6
D) Cation, 1s22s22p4
Answer: C
Explanation: Based on the periodic table, O is atomic number 8, which means it has 8 electrons. The first few atomic orbitals are 1s, 2s, and 2p.Each orbital can hold 2 electrons maximum, and there are 2l+1 of each type of orbital (s,p,d,f,g,...), where l=0 corresponds to an s orbital, l=1 means porbital, and so on. So, the configuration for neutral O atom is: 1s22s22p4. When oxygen gains two electrons, it acquires a charge of 2−. Therefore, the twoelectrons, which go into the highest-energy atomic orbitals, give you a new configuration of1s22s22p6for O2−, which is the same electron configuration as Ne. That is known as a noble-gas-like configuration, and in general it is stable if oxygen is like that in a compound (having 8 electrons in its 2s and 2p orbitals combined).
arrange the following atoms in order of decreasing atomic radius Na,P,Al,K,Mg,Cl,Cs
We can arrange the given atoms in order of decreasing atomic radius:
Cs > K > Na > Mg > Al > P > Cl
When arranging atoms in order of decreasing atomic radius, the general trend is to move from left to right across a period and from top to bottom within a group on the periodic table. The atomic radius generally increases as you move down a group and decreases as you move across a period.
Based on this trend, we can arrange the given atoms in order of decreasing atomic radius:
Cs > K > Na > Mg > Al > P > Cl
Cs (Cesium) has the largest atomic radius as it is located at the bottom of Group 1 (alkali metals) on the periodic table.
K (Potassium) has a slightly smaller atomic radius than Cs but is still larger than the next elements.
Na (Sodium) is smaller than K but larger than the subsequent elements.
Mg (Magnesium) is smaller than Na but larger than Al.
Al (Aluminum) is smaller than Mg but larger than P.
P (Phosphorus) is smaller than Al but larger than Cl.
Cl (Chlorine) has the smallest atomic radius among the given atoms.
So, the atoms arranged in order of decreasing atomic radius are Cs, K, Na, Mg, Al, P, Cl.
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How gas behave at STP ( Standard Temperature & Pressure )
Answer:
The National Institute of Standards and Technology defines STP differently as absolute pressure of 1 atm (101.325 kPa, 14.696 psi) and 20 degrees Celsius (293.15 degrees Kelvin, 68 degrees Fahrenheit).
7. A certain hydrocarbon, CxHy, is burned (reacts with O2 gas) and produces 1.955 g of CO2 for every
1.000 g of H20. What is the empirical formula of this hydrocarbon?
CxHy + (X + y/4) O2 -> xCO2 + y/2 H2O
Answer:
The empirical formula of the hydrocarbon is C₂H₅
Explanation:
The formula for the hydrocarbon is \(C_xH_y\)
The mass of CO₂ produced per 1,000 g of H₂O = 1,955 g
The equation for the chemical reaction is given as follows;
\(C_xH_y\) + (x + y/4) O₂ → XCO₂ + y/2H₂O
From the given chemical equation, counting the number of atoms on both sides of the equation, we have;
The molar mass of CO₂ = 44.01 g/mol
The molar mass of H₂O = 18.01528 g/mol
The number of moles of H₂O in 1,000 g of H₂O = 1,000 g/(18.01528 g/mol) = 55.5084351 moles
The number of moles of CO₂ in 1,955 g of H₂O = 1,955 g/(44.01 g/mol) = 44.4217223 moles
Therefore, given that X moles of CO₂ is produced alongside Y/2 moles of H₂O. we have;
X = 44.4217223, Y/2 = 55.5084351
∴ Y = 2 × 55.5084351 = 111.0168702
The ratio of X to Y = X/Y = 44.4217223/111.0168702 = 0.40013488238
∴ The ratio of X to Y = X/Y ≈ 0.4 = 4/10
X/Y ≈ 4/10
The empirical formula is the representation of molecular formula in the smallest whole number ratio of the elements of the molecules
Therefore, when X = 4, Y = 10, from which we have the smallest ratio as;
When X = 2, Y = 5
The empirical formula of the hydrocarbon is therefore, \(C_xH_y\) = C₂H₅
The given chemical equation becomes;
C₂H₅ + (2 + 5/4) O₂ → 2CO₂ + 5/2H₂O
C₂H₅ + 3.25 O₂ → 2CO₂ + 2.5 H₂O
We then have;
4C₂H₅ + 13 O₂ → 8CO₂ + 10 H₂O
The empirical formula of the hydrocarbon, \(C_xH_y\) = C₂H₅.
hydrochloric acid is usually purchased in a concentrated form that is 37.0% hcl by mass and has a density of 1.20 g/ml . part a how much concentrated solution would it take to prepare 2.85 l of 0.435 m hcl upon dilution with water?
Total, 3.36 liters of the concentrated solution would it take to prepare 2.85 liters of a 0.435 M HCl solution.
To calculate the amount of concentrated hydrochloric acid solution needed to prepare a diluted solution, you can use the equation;
M₁V₁ = M₂V₂
where; M₁ = initial concentration of the concentrated solution
V₁ = volume of the concentrated solution used
M₂ = final concentration of diluted solution
V₂ = final volume of the diluted solution
In this case;
M₁ = 37.0% = 0.37 (as a decimal)
V₁ = ?
M₂ = 0.435 M
V₂ = 2.85 L
Rearranging the equation, we get;
V₁ = (M₂ × V₂) / M₁
Plugging in the values;
V₁ = (0.435 M × 2.85 L) / 0.37
V₁ ≈ 3.36 L
Therefore, you would need approximately 3.36 liters of the concentrated hydrochloric acid solution.
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Cookware companies have been using a chemical called C-8, which helps to create a nonstick coating to pans. However, the Environmental Protection Agency (EPA) recently claimed that the use of C-8 in the manufacturing of nonstick cookware should be discontinued because studies show it causes cancer.
Who might benefit financially the most from the EPA’s claim?
OwO ^ ^ its A guys knowing cause i took the test
Answer:
C
Explanation:
cookware manufacturers who make pans out of steel only
Draw the lewis structure for each of the following - letter ba) NF3b) ClO3-c) HOBrd) SO3-2
Answer:
Explanation:
The question requires us to draw the Lewis structure for ClO3-.
In order to draw the Lewis structure of a molecule or ion, we need to consider the number of valence electrons in each atom of the structure:
O presents electron configuration: 1s2 2s2 2p4, thus it contains 6 valence electrons.
Cl presents electron configuration: 1s2 2s2 2p6 3s2 3p5, thus it contains 7 valence electrons.
Now, we can start drawing the Lewis structure for ClO3-.
1) First, we need to choose a central atom. Let's consider Cl as there is only one atom of it:
2) Next, we can "add" the electrons between the outer atoms and the central atom, representing bonds:
3) Now, let's complete the electrons on the atoms, starting with the outer atoms and then filling the central atom. Note that the total electrons is 3*6 + 1*7 = 25 electrons.
what type of chemical bond forms between two atoms bearing opposite charges?
Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.
An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.
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according to the following reaction, which molecule is acting as a base? h2o h2so4 → h3o hso4-
In the following reaction , H₂O is acting as a base . H₂0 is the base in the forward reaction , because it accepts a proton, and becomes H₃O⁺.
Option A is correct .
H₂O + H₂SO₄ → H₃O + HSO₄⁻
H₂SO₄/HSO₄⁻ is an acid/conjugate base pair. . H₂0/H₃O⁺ is a base/conjugate acid pair. The acid and base are the reactants in the forward reaction.
Conjugate base:
When compared to the acid that gave rise to it, a conjugate base has one fewer H atom and one more charge. After acid loses its hydrogen ion, it is a residue. The more grounded a corrosive, the more fragile its form base, and, on the other hand, the more grounded a base, the more vulnerable its form corrosive.
Why does it go by the name "conjugate base"?The Bronsted-Lowry definition of acids and bases centers on the formation of conjugate acids and bases. The conjugate acid is the species formed when the base accepts the proton, and the conjugate base is the ion or molecule that remains after the acid has lost its proton.
Incomplete question:
according to the following reaction, which molecule is acting as a base?
H₂O + H₂SO₄ → H₃O + HSO₄⁻
A. H₂O
B. H₂SO₄
C. H₃O
D. HSO₄⁻
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during normal ventilation, exhaled air has a co2 concentration of 35 mmhg. what would you predict the value of the first exhalation would be after a prolonged breath hold?
During a prolonged breath hold, the body continues to consume oxygen and produce carbon dioxide. As a result, the concentration of carbon dioxide in the lungs increases.
It is one of the most important and widely used concepts in chemistry as it allows us to quantify the amount of a particular substance in a given system. Concentration plays a crucial role in many chemical reactions, as the rate of a reaction is often directly proportional to the concentration of the reactants.
There are different ways to express concentration, including molarity, molality, mass percentage, mole fraction, and parts per million (ppm). Molarity is the most commonly used unit of concentration and is defined as the number of moles of solute present in one liter of solution. Molality is similar to molarity but is defined as the number of moles of solute present in one kilogram of solvent. Moreover, it is essential to accurately measure the concentration of solutions in various industrial processes such as pharmaceuticals, food production, and water treatment.
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Rank the following elements that make up the majority of Earth’s crust according to increasing ionization energy. a. Mg b. Ca c. Sid. O
The ionization energy of the elements that make up the majority of Earth's crust, ranked in increasing order, is:
d. Oxygen (O)
c. Silicon (Si)
a. Magnesium (Mg)
b. Calcium (Ca)
Ionization energy refers to the amount of energy required to remove an electron from an atom. The higher the ionization energy, the more energy is required to remove an electron, and the more difficult it is to form a positive ion.
In general, ionization energy increases across a period (left to right) as the atomic number increases and the electrons are held more tightly by the positively charged nucleus. Within a group (vertical column), ionization energy decreases as the number of electrons in the valence shell increases, leading to a larger and more diffuse electron cloud.
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What substance is always a reactant in a combustion reaction?
Oxygen (O₂) is always a reactant in a combustion reaction. Combustion is a type of c₂hemical reaction where a substance reacts with oxygen to produce heat and light. The general equation for combustion is: fuel + O₂ -> CO₂ + H₂O + heat.
When a substance reacts with oxygen, it undergoes a sort of chemical reaction known as combustion, which usually results in the production of heat and light. Burning is a common name for this reaction, which plays a crucial role in numerous industrial, transportation, and energy-related applications. There are many fuels that can be used in combustion, including wood, other organic materials, and fossil fuels (coal, oil, and natural gas). Depending on the fuel and combustion circumstances, the byproducts of combustion are typically carbon dioxide (CO₂) and water vapour (H₂O), along with a variety of additional gases and particles. Exothermic, or heat-releasing, combustion reactions can be used for a variety of things, including heating, power production, and propulsion. Yet, burning also results in the production of greenhouse gases that fuel climate change.
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A 0.1 M solution of HCL contains
A) Fewer H3O+ ions than OH- ions+
B) More H3O+ ions than OH- ions+
C) An equal amount of both ions
D) Neither of these ions
Answer:
A) 0.1 M solution of HCl contains more H3O+ ions than OH- ions. This is because HCl is a strong acid that dissociates completely in water to form H3O+ and Cl- ions. The concentration of H3O+ ions in the solution will be equal to the concentration of HCl, which is 0.1 M. Since water also undergoes autoionization to form H3O+ and OH- ions, the concentration of OH- ions in the solution will be determined by the ion product constant for water (Kw), which is equal to [H3O+][OH-] = 1.0 x 10^-14 at 25°C. Since [H3O+] = 0.1 M, [OH-] = Kw / [H3O+] = 1.0 x 10^-14 / 0.1 = 1.0 x 10^-13 M. Therefore, the concentration of H3O+ ions is greater than the concentration of OH- ions in a 0.1 M solution of HCl, so the correct answer is B) More H3O+ ions than OH- ions.
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What is the balanced equation for the combustion of butane when the equation is balanced with the smallest, whole numbers possible
The balanced equation for the combustion of butane with the smallest whole numbers possible is:
2C4H10 + 13 O2 → 8 CO2 + 10 H2O.
Note that this equation is balanced because there are an equal number of atoms of each element on both sides of the equation.
The balanced equation for the combustion of butane with the smallest whole numbers possible is:
C4H10 + 13/2 O2 → 4 CO2 + 5 H2O.
However, since we need whole numbers, we can multiply the entire equation by 2 to achieve this:
2(C4H10) + 13(O2) → 8(CO2) + 10(H2O)
So, the final balanced equation with whole numbers is:
2C4H10 + 13O2 → 8CO2 + 10H2O
The equation shows that when two molecules of butane (C4H10) react with 13 molecules of oxygen (O2), they produce eight molecules of carbon dioxide (CO2) and 10 molecules of water (H2O).
The coefficients in front of each compound represent the number of molecules involved in the reaction.
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What type of chemical reaction does this represent.
Answer:
combustion
Explanation:
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which type of cell is shown in the diagram - a plant cell, a yeast cell or a bacterial cell
Answer:
bacterial cell plant cells dont have a tail
Explanation:
The type of cell shown in the diagram is the bacterial cell as plant cell do not have tails while bacteria have tail.
Bacteria are prokaryotic unicellular organisms. They have a relatively simple cell structure compared to eukaryotic cells. They also do not possess any membrane-bound organelles such as a nucleus. However, do they possess genetic material (DNA or RNA) in the intracellular space called the nucleoid.
Bacteria lack a membrane-bound nucleus and other internal structures and are therefore ranked among the unicellular life-forms called prokaryotes. Prokaryotes are the dominant living creatures on Earth, having been present for perhaps three-quarters of Earth history and having adapted to almost all available ecological habitats.
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For each main-group element, what is the relationship between it's group number and the number if valence electrons that the group members have?
Explanation:
The representative elements are in columns A1 - A7. In an 18 column table the map is as follows:
A1 = column 1, hydrogen + alkali metals have 1 valence
A2 = column 2, alkaline earth metals have 2 valence
A3 = column 13, Boron family have 3 valence
A4 = column 14, Carbon group have 4 valence
A5 = column 15, Nitrogen family have 5 valence
A6 = column 16, Oxygen column - chalcogens have 6 valence
A7 = column 17, Fluorine column - halogens have 7 valence
The group number of the representative elements = the number of valence electrons.
plz help
Which is the most reasonable hypothesis for the cause of the disorder?
A.
Since extracellular fluid is rich in potassium ions, K+ ions diffuse into the cell readily. Since intracellular fluid is rich in chlorine ions, Cl- ions diffuse out of the cell readily. The mutation causes the cell to be impermeable to Cl-.
B.
Homeostasis requires that the amount of sodium, chlorine, and potassium remain exactly the same at all times. Therefore, energy is needed to move exact quantities of each ion into and out of the cell.
C.
Sodium and potassium must move into and out of the cell to move the charge along the cell membrane. Sodium will readily diffuse into the cell, along the concentration gradient, but to move it back out requires energy in the form of ATP. The mutation causes a malformation in one of the transport proteins, so the process is disrupted.
D.
Sodium and chlorine must move into and out of the cell to move the charge along the cell membrane. Sodium will readily diffuse into the cell, along the concentration gradient, but to move it back out requires energy. The mutation causes a disruption in the shape of ATP and a malformation in one of the transport proteins, so the process is disrupted. Continued production of misshapen ATP and transport proteins would be catastrophic to all body systems.
Answer: I dont want to make you wrong but I think its D.
Which of the following chemical reactions is a decomposition reaction?
BaCO, → BaO + CO,
2Ca + 0₂ → 2CaO
3Br₂ + 2Fel₂ → 2FeBr₂ +31₂
MgCl₂ + H₂SO, MgSO, + 2HCI
Explanation:
The chemical reaction that is a decomposition reaction is:
BaCO3 → BaO + CO2
If 18.75 mole of helium gas is at 10oC and gauge pressure of 0.350 atm. (a) Calculate the volume of the helium gas under these condition and (b) calculate the temperature if the gas is compressed to precisely half the volume at a gauge pressure of 1.00 atm.
Given, Number of moles of helium gas = 18.75Temperature of gas = 10 °C. Gauge pressure of gas = 0.350 atm.
Using ideal gas law, PV = nRT, where, P = pressure of gas, V = volume of gas, n = number of moles of gasR = gas constant, T = temperature of gas(a) The volume of the helium gas under these condition can be calculated using the ideal gas law as follows: PV = nRTV = (nRT)/P
Put the values, P = 0.350 atm, V = ?n = 18.75 molesR = 0.08206 L atm K-1 mol-1T = (10+273)K = 283KTaking all the values in equation,V = (18.75 × 0.08206 × 283) / 0.350V = 1296.26 L. Therefore, the volume of helium gas at the given condition is 1296.26 L.(b) The temperature of the gas can be calculated as follows: If the gas is compressed to half the volume, the final volume is V/2 = 1296.26/2 = 648.13 L. The new gauge pressure is 1.00 atm. Using the ideal gas law, PV = nRT(Temperature remains the same as the gas is compressed at constant temperature)T = (PV)/(nR)
Put the values,P = 1.00 atmV = 648.13 Ln = 18.75 moles R = 0.08206 L atm K-1 mol-1T = (1.00 × 648.13) / (18.75 × 0.08206)T = 245.5 K. Therefore, the temperature of the gas when it is compressed to precisely half the volume at a gauge pressure of 1.00 atm is 245.5 K.
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How much energy does it take to boil 100 mL of water? (Refer to table of constants for water. )
A. 100 mL × 1g divided by 1mL × 1mol divided by 18. 02g × 6. 03 kJ/mol = 33. 5 kJ
B. 100 mL × 1g divided by 1mL × 1mol divided by 18. 02g × (–285. 83 kJ)/mol = –1586 kJ
C. 100 mL × 1g divided by 1mL × 1mol divided by 18. 02g × 40. 65 kJ/mol = 226 kJ
D. 100 mL × 1g divided by 1mL × 1mol divided by 18. 02g × 4. 186 kJ/mol = 23. 2 kJ
Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.
The correct answer is D. 100 mL × 1g divided by 1mL × 1mol divided by 18.02g × 4.186 kJ/mol = 23.2 kJ
To calculate the energy required to boil 100 mL of water, we need to use the specific heat capacity of water, which is approximately 4.186 J/g·°C. The molar mass of water is 18.02 g/mol.
First, we convert the volume of water from milliliters to grams:
100 mL × 1 g/1 mL = 100 g
Then, we calculate the number of moles of water:
100 g × 1 mol/18.02 g = 5.548 mol
Finally, we multiply the number of moles by the molar heat of vaporization of water, which is approximately 40.65 kJ/mol:
5.548 mol × 4.186 kJ/mol = 23.2 kJ
Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.
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1) A sample of copper has a mass of 4.75 g and a volume
of 0.5325 cm3. What is the density of copper?
Answer:
8.92 g/cm³Explanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
mass = 4.75 g
volume = 0.5325 cm³
We have
\(density = \frac{4.75}{0.5325} \\ = 8.920187\)
We have the final answer as
8.92 g/cm³Hope this helps you
1. Pressure of a gas (decreases, increases) if the volume decreases when temperature
is constant.
Answer:
If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase. ... Gay-Lussac's law states that at constant volume, the pressure and temperature of a gas are directly proportional.
Explanation:
i hope this helped
If the same large amount of heat is added to a 250 g piece of aluminum and a 150 g piece of aluminum, what will happen?
QUESTION 1 Before there was evidence from rocks and fossils, many scientists theorized that the continents were once joined together. Using only maps, these scientists observed that -
Using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.
One key observation was the remarkable fit between the coastlines of different continents, such as South America and Africa. They noticed that the shapes of these continents seemed to match like puzzle pieces, suggesting they were once connected.
Additionally, scientists observed similar geological features across continents, such as mountain ranges and rock formations, that extended across apparent continental boundaries. They also noticed the distribution of certain plant and animal species that were found on different continents but had no means of natural dispersal.
These observations, made solely through maps, led scientists to propose the concept of continental drift, which was later supported by geological and paleontological evidence found in rocks and fossils.
Therefore, using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.
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The chart below shows the major types of minerals mined in the United States and Australia.
Country Major types of minerals
United States coal, iron, silver, copper, oil
Australia iron, oil, uranium, silver, lead, zinc, bauxite, coal, copper, gold
Based on the chart, what percent of the major types of minerals mined in Australia are also mined in the United States?
A 30%
B 50%
C 70%
D 90%
Answer:
I think it is b 50%
Which condition must be met for conduction to occur?
A:particles must be large
B:articles must be small
C:particles must be in contact
D:particles must be spread apart
Answer:
D
Explanation:
when you boil water in a pot and put a lid or something meatal over it when it reaches a certain temperature it gets steamy and during that it will get hyper and run around in circles and will go up but since the meatal or glass lid is there it will stop it and you will see water droplets on the inside.
Answer:
d
Explanation: