A chemical element that has an atomic number less than 58 and an atomic mass greater than 135.6m is barium (atomic no. 56 and atomic mass137.13 ) and lanthanum (atomic no. 57 and atomic mass 135.6).
Give a brief introduction about Barium and Lanthanum. BariumBarium is an element with the symbol Ba and atomic number 56. It is an alkaline earth metal that is soft and silvery, and it is the fifth element in group 2. Barium is never found in nature as a free element due to its extreme chemical reactivity. Oil well drilling fluid uses barium sulfate as an insoluble ingredient. It is employed as an X-ray radiocontrast agent in a purer form to image the human gastrointestinal tract. Barium compounds that dissolve in water have been employed as rodenticides despite being hazardous.
LanthanumChemical element lanthanum has the atomic number 57 and the symbol La. It is a silvery-white, ductile, soft metal that slowly tarnishes when exposed to air. It serves as the eponym for the group of 15 related elements in the periodic table between lanthanum and lutetium, of which lanthanum is the first and prototype. The rare earth elements traditionally include lanthanum.
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Students measured the area of Mr. Gandelman’s classroom. They noted that it is 74.27 square meters. According to measurements indicated in the architect’s plans, the room’s actual area is 78.5 square meters. What is the % error in the students’ measurement?
Answer:
Personally I think thatthr answer could be 5.38853503%, you can round it however you need.
Explanation:
There's a value of error between the noted square meters and the actual room's area. which is 4.23. Using the formula to get the percentage of error is getting the value (78.5 - 74.27 = 4.23) and dividing it by 78.5. Then just multiply it by 100 to get the percentage.
A single population is made of
O multiple organisms of the
same species.
O multiple organisms of different species.
• multiple communities.
O multiple biomes.
18. What is the mass of an object with a density of 2.44g/ml and a volume of
25ml?
a. 61g
b. 61.0g
c. 10.2g
d. 0.098g
The mass of the object with a density of 2.44g/ml and a volume of
25ml is 61g
Density is mass per unit volume.The mass is as follows;d=m/vm=dvm= 2.44 g/ml ×25 ml=61gThe measure of how densely a substance is packed together is called density. It is defined as the mass per unit volume.A measurement of density contrasts the mass of an object with its volume. The amount of matter in a certain volume of an object is referred to as high density. A substance's density describes how thick it is in a given space. Density is essentially a measurement of how tightly things are packed. It is a particular physical trait of that thing.To learn more about density visit:
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How do you draw this bond-line structure?
Name 3 Rectangular Items that are something you can hold. And then name those items' Length, Width, Height, Area, or Volume.
Name 2 Triangular Items that are something you can hold. And then name those items' Length, Width, Height, Area, or Volume.
Name 3-Dimensional Rectangular Items that are something you can hold. And then name those items' Length, Width, Height, Area, or Volume.
Answer:To find the volume of a rectangular prism, we multiply the length of the prism by the width of the prism by the height of the prism.
honeslty
Explanation:
What is the difference between
a. Acid and Base
b. Weak acid and strong acid
c. Organic acid and minerals acid
d. Neutral salt and minerals acid
Base is a proton acceptor, whereas acid is a proton giver.
Strong acid and strong base depend upon ionization.
Acid is a hydrogen ion donor and base is a hydrogen ion acceptor.When an acid is dissolved in water, all of its molecules disintegrate, making the acid powerful. When an acid is dissolved in water, only a small number of its molecules disintegrate, making the acid weak.A strong acid is an acid in which all of the acid is dissolved in water, its molecules disintegrate.A weak acid is an acid in which only a few molecules break apart when the acid is dissolved in water.Mineral acids are inorganic compounds consisting of different chemical element combinations, whereas organic acids are organic molecules mostly composed of carbon and hydrogen atoms. This is the main difference between mineral acids and organic acids.Mineral acids are inorganic compounds consisting of different chemical element combinations, The acid for which pH is close to 7 is a neutral acid.To learn more about acids visit:
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Why is the classification species not considered a group? (1 point)
O Each species is a separate type of organism.
O Each species is an individual organism.
O Each species lacks the characteristics of the levels above.
O Each species shares characteristics with other species.
Each species is a separate type of organism.
A species is a group of creatures that share similar traits. The same species of organisms are capable of sexual reproduction as well as interbreeding and producing fertile offspring. It is a fundamental unit of taxonomy and classification.The system is divided into seven categories: Kingdom, Phylum or Division, Class, Order, Family, Genus, and Species. Kingdom is the most inclusive category.In a group, many types of an organism can be included even if they do not share the same traits. But species is a group of organisms that share similar traits.For example, human beings are species as they are all alike in physical features, way of reproduction, etc. But the animal is considered a group because it included a variety of living beings.Therefore, Each species is not considered a group.
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Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion. Each 4−mL portion of Maalox contains 320 mg of aluminum hydroxide, 320 mg of magnesium hydroxide, and 32 mg of simethicone. If the recommended dose is two teaspoons four times a day, how many grams of each substance would an individual take in a 12−hour period. (1 teaspoon = 5 mL.)
Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion in which
4 ml contains
= 320mg of aluminum hydroxide
= 320mg of magnesium hydroxide
= 32mg of simethicone
recommended doses = 4 times * 2 tea spoon = 8 tea spoon/ day
given = 1 tea spoon = 5 ml
8 tea spoon = 40 ml
hence,
amount of aluminum hydroxide = 320/4 * 40 = 3200mg = 3.2 g
amount of magnesium hydroxide = 320/4 * 40 = 3.2 g
amount of simethicone = 32/4 * 40 = 320 mg = 0.32g
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This is an impossible formula. Pretend it is real.
If you had 1 mol of Mn4(ClO4)3 how many moles of Cl would there be?
Remember that you should never include a 1 as a subscript but for the sake of clarity for this problem you may see a 1 as a subscript.
Make sure your answer includes TWO decimal places.
The number of mole of Cl in 1 mole of Mn₄(ClO₄)₃ is 3.00 moles
Description of Mn₄(ClO₄)₃From the formula of the compound, Mn₄(ClO₄)₃ the following were obtained:
4 moles of Mn3 moles of Cl12 moles of OHow to determine the number of mole of Cl in 1 mole of Mn₄(ClO₄)₃From the formula, we can see that 3 moles of Cl are present.
Thus, 1 mole of Mn₄(ClO₄)₃ will contain = 1 × 3 = 3.00 moles of Cl
Therefore, we can conclude that 1 mole of Mn₄(ClO₄)₃ contains 3.00 moles of Cl
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Why is isopropyl alcohol a pure substance?
Answer:
A substance is considered a chemically pure substance when it has a fixed chemical composition throughout, and uniform physical and chemical properties. Because isopropyl alcohol ( C3H8O ) Is a homogenous compound with constant physical and chemical properties, as well as a uniform chemical structure, isopropyl alcohol is definitely fit to be considered a pure substance.
1. If a chemical reaction occurs and a solid reacts with a gas to form a new solid,
(2 Points)
the mass of the new solid substance increases because a substance in the gas state has mass and contributes
to the new substance's mass.
the mass of the new solid substance does not change because a substance in the gas state does not have
mass and therefore, will not contribute any new mass of the new substance.
it is difficult to determine if the new substance will increase in mass because it depends on the type of gas.
According to the law of conservation of mass, if a chemical reaction occurs and a solid reacts with a gas to form a new solid: (a) the mass of the new solid substance increases because a substance in the gas state has mass and contributes to the new substance's mass.
Law of conservation of mass states that, the mass can neither be created nor be destroyed in a chemical reaction, it can only be transferred rom one form to another or from the reactants to the products of a chemical reaction.
Reactant of a chemical reaction with any state of matter, either solid, liquid or gas has definite mass and that is counted when the final mass of the product is considered.
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A student uses a diagram to show the scale sizes of the planets. Which planet’s diameter would be approximately the distance across the United States?
The planet’s diameter would be approximately the distance across the United States Mercury.
What is planet mercury known for?
It is known to be the Fastest Planet as well as the one that is very close to the Sun.Mercury is one that tends to travel a lot faster than others. Mercury is seen as one that is known for being the fastest planet as well as having the shortest distance to travel around the Sun, which is about 88 days.Therefore, The planet’s diameter which would be approximately the distance of the United States is Mercury.
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Which of the following elements would you expect to be most reactive, based
on the number of valence electrons it has?
O A. Potassium (K)
OB. Titanium (Ti)
O C. Iron (Fe)
O D. Calcium (Ca)
A. Potassium
this is because it only has one valence electron, which can be very easily removed, hence it's reactivity.
In ironmaking, iron metal can be separated from iron ore (Fe2O3) by heating the ore in a blast furnace in the presence of coke, which is a form of carbon: 2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g) If 1000 kg of iron ore and 120 kg of coke are heated in a blast furnace, determine the limiting reactant, the theoretical yield of iron metal, and the theoretical yield of carbon dioxide.
The limiting reactant is iron ore, the theoretical yield of iron metal is 701.344 kg, and the theoretical yield of carbon dioxide is 413.292 kg.
Stoichiometric problemFrom the equation of the reaction:
[tex]2 Fe_2O_3(s) + 3 C(s) --- > 4 Fe(s) + 3 CO_2(g)[/tex]
The mole ratio of iron ore to carbon is 2:3.
Mole of 1000 kg of iron ore = 1000000/159.69
= 6,262 moles
Mole of 120 kg carbon = 120000/12
= 10,000 moles
Thus, it appears that the carbon is in excess while the iron ore is limited in availability.
The mole ratio of the iron ore and the iron produced is 1:2. Thus, the equivalent number of moles of iron produced will be:
6,262 x 2 = 12,524 moles
Mass of 12,524 moles of iron = 12,524 x 56
= 701,344 g or 701.344 kg
Thus, the theoretical yield of iron is 701.344 kg.
The mole ratio of the iron ore and the carbon dioxide produced is 2:3. The equivalent mole of carbon dioxide produced will be:
6,262 x 3/2 = 9,393 moles
Mass of 9,393 moles carbon dioxide = 9,393 x 44
= 413,292 or 413.292 kg
The theoretical yield of carbon dioxide is, therefore, 413.292 kg.
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Zootopia movie: Why is Judy Hopps placement at the police academy so unusual?
Answer:
down below
Explanation:
Judy Hopps was one of the smaller prey animal while the others were predators or bigger prey animals. Meaning, she was tiny and in some minds, was easier to take down or may not be able to do the job as well as the bigger animals. Also, she was, less noticeably, the only female prey animal.
what distance in miles can you drive in your new Prius hybrid, if your car gets 56 miles per gallon and you have 15.5 gallons of gas?
Taking into account the rule of three, you can drive your new Prius hybrid a distance of 868 miles.
Rule of threeRule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b) ÷a
Distance in miles in this caseIn this case, you can apply the following rule of three: If the car for 1 gallon of gasoline gets 56 miles, for 15.5 gallons of gasoline it gets how many miles?
1 gallon ⇒ 56 miles
15.5 gallons ⇒ x
So: x= (15.5 gallons ×56 miles) ÷1 gallon
Solving:
x= 868 miles
In summary, you can drive your new Prius hybrid a distance of 868 miles.
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PLS HELP ME WITH MY CHEMISTRY
Answer:
[tex] \boxed{8.9 \: g /cm^3}[/tex]
Explanation:
Given:
Mass of sample= 39.2 g
Volume occupied= 4.4 cm³
To find:
Density=?
Solution:
Formula to be used,
[tex]\sf Density = \frac{mass}{volume} [/tex]
[tex]\sf Density = \cancel{ \frac{39.2}{4.4} } = 8.9 \bar{0} \bar{9} \: g /cm^3[/tex]
The rounder figure answer upto tenths place can be written as 8.9 g/cm³
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A sextant resembles which mathematical instrument?
Answer:
quadrant
Explanation:
sextant (astron.) instrument resembling a quadrant having a graduated are equal to ⅙ of a circle.
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Name the material sent into slave by a supernova
The distance between Miami and Key Largo is 70. miles. If a mile is 5,280ft and 1 inch is 2.54 cm, calculate this distance in kilometers.
If the distance between Miami and Key Largo is 70 miles, this distance is equivalent to 112.65 kilometers.
What is distance?Distance is the amount of space between two points, usually geographical points, usually (but not necessarily) measured along a straight line.
According to this question, the distance between Miami and Key Largo is 70 miles.
Miles and kilometers are both units of measurement for distance. The conversion factor is as follows:
1 mile = 1.609 kilometres
70 miles is equivalent to 70 × 1.609 = 112.65 kilometers
Therefore, the distance between Miami and Key Largo is 70 miles, this distance is equivalent to 112.65 kilometers.
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HELPPP
Ferric chloride combines with water in a reversible reaction to produce ferric hydroxide and hydrochloric acid as shown.
FeCl3 + 3H₂0 Fe(OH)3 + 3HCI
Which reaction must occur at the same time as the formation of ferric hydroxide?
(1 point)
O Fe(OH)3 + 3HCI → FeCl3 + 3H₂O
O FeCl3 + 3HCI → Fe(OH)3 +3H₂O
O FeCl3 Fe + 3Cl
O 2H₂O → H₂ + O₂
The reaction that will occur at the same time as the formation of ferric hydroxide will be [tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex].
What is a reversible reaction?A reversible reaction is a reaction that proceeds both forward and backward at the same time.
In other words, it is a reaction in which as the reactants react to form products, the products simultaneously react to form reactants.
Thus, looking at the original forward reaction:
[tex]FeCl_3 + 3H_2O --- > Fe(OH)_3 + 3HCI[/tex]
Ferric chloride reacts with water to form ferric hydroxide and hydrochloric acid. Since the reaction is reversible, the ferric hydroxide and hydrochloric acid formed will simultaneously be reacting to form the reactants.
In other words, the reaction that will occur at the same time as the formation of ferric hydroxide will be:
[tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex]
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Part C
Convert 8x10-4 kg to micrograms.
Express your answer with the appropriate units. Use the appropriate metric symbols for the units.
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why is the potassium atom larger than the kypton atom
how many grams is there if you have 2.85x10^-4 with 176g/mol
0.05016 grams is there if you have 2.85x10^-4 with 176g/mol.
The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights.
mole = 2.85x10^-4
mol. weight = 176g/mol
Formula,
mole = weight taken / mol. wt of the compound
2.85x10^-4 = weight taken / 176g/mol
weight taken = 2.85x10^-4 x 176g/mol
=0.05016 grams
0.05016 grams is there if you have 2.85x10^-4 with 176g/mol.
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If you begin with a sample of carbon dioxide at − 60.0 ∘C and 0.50 atm and warm it to 30.0 ∘C and 0.50 atm , then there will be no phase transition in the sample. true or false
If a sample of carbon dioxide is at − 60.0 ∘C and 0.50 atm and warm to 30.0 ∘C and 0.50 atm, then there will be no phase transition in the sample is a True statement.
Phase Transition:
The three main states of matter are Solid, Liquid, and gas. A phase transition occurs from one state of matter to another when energy is supplied or cut.When energy is supplied to the molecules, solid converts to liquid, and liquid converts to gas. Then, the energy increases the speed of the molecules, the density decreases and phase transition takes place.On the other hand, when the supply of energy is stopped from the molecules, the gas turns to liquid, and liquid converts to solid. Both the temperature and pressure are in the same phase.Therefore, there will be no phase transition in the sample. Hence, it is a true statement.
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A certain chemical reaction releases 27.4 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 880. J of
heat?
Set the math up. But don't do any of it. Just leave your answer as amath expression.
A chemical reaction of exothermic kind releases energy in the form of heat and light.
We are given that reactant releases 27.4kJ/g for every gram of reactant consumed.
We are required to find number of grams of reactant that has been consumed
It is also given that 880J of energy is released
Hence, grams of reactants consumed is 880/27.4gm
Disclaimer:
It has been asked by the student to leave the question as mathematical expression.
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A 0.5 kilogram piece of aluminum increases its temperature 7 degrees C when heat energy is added. How much heat is produced this change in temperature
Answer: Heat energy (Q) added is 3150 (J) .
Explanation:
how many moles are present in 1.0 m3 O2 at STP
Answer:
Explanation:0.089mol
at STP 22.4l of any ideal gas is the volume of one mole which means the number of moles in 02 is222.4=0.089.
Select the correct answer.
According to Newton's law of universal gravitation, what is the effect of gravity on two objects as the distance between them increases?
OA. The force of gravity increases.
OB. The force increases by twice the previous amount.
OC. There is no effect on the force of gravity.
O D. The force of gravity decreases.
Answer:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.
Answer:
The force of gravity decreases.
Explanation:
Plato/Edmentum
If the oxide contains 22.24 % O by mass, what is the identity of the metal?
Express your answer as a chemical symbol.
The oxide contains 22.24% O by mass, so the identity of the metal as a chemical symbol is lead (Pb).
What is metal?A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations) are called metals.
Mass percentage of oxygen in the oxide, i.e.,
ω(O) divided by 100 ω(O)
=22.24% ÷ 100%.
Mass percentage of oxygen in the oxide, i.e .ω(O) = 0.2224
Now the mass percentage of oxygen in the oxide multiplied by 100 ten we get the mass of oxygen in the oxide. If we take 100 grams of compound:
1) m(O) = ω(O) * 100 g.
Mass of oxygen in the oxide, i.e. m(O) = 0.2224 * 100 g.
Mass of oxygen in the oxide. i.e., m(O) =22.24g
Amount of oxygen, i.e.,
n(O) = mass of oxygen in the oxide ÷ molar mass of oxygen.
n(O) = m(O) ÷ M(O) amount of oxygen
n(O) = 22.24g ÷ 16 g/mol,
amount of oxygen i.e. n(O) = 1.39 mol
Mass of metal in the oxide, i.e., m(M) = 100 g - 22.24 g.
Mass of metal in the oxide i.e., m(M) = 77.76g
Now we to find the molar mass of metal oxide,
Molar mass of the metal :
= mass of metal in the oxide ÷ amount of oxygen(M)
= m(M) ÷ n(M). M(M)
= 77.76 g ÷ 1.39 mol.
Molar mass of the metal will be 5.94 g/mol.
Therefore, The identity of the metal is lead (Pb).
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