How many grams of CO2 are contained in 4.77x10^24 molecules of of CO2?
Answer:
3.5x1024 3.5 x 10 24 carbon dioxide molecules weighs 256 g.
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type?
Al + Fe3O4→ Al2O3 + Fe
The balanced equation :
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
You just have to look for which element is in bold because the question is not clear
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction
Al + Fe₃O₄→ Al₂O₃ + Fe
give a coefficient
aAl + Fe₃O₄→ bAl₂O₃ + cFe
O, left=4, right=3b⇒3b=4⇒b=4/3
Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3
Fe, left=3, right=c⇒c=3
The equation becomes :
8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
Any element above 92 on the
periodic table has to be constructed
in a lab.
A.False
B.True
answer: it should be false
Question 2
1 pts
Because transition metals have more than one stable oxidation state their charges
Answer:
Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.
Explanation:
1.) a copper penny has a mass of 3.1 g and a volume of 0.35 cm^3. what is the dencity of the copper penny?
2.) A block of wood has the dimensions 7.0 cm x 10.0 cm x 5.0 cm. What is the
volume of the block of wood?
3.) A graduated cylinder has a volume of 50.0 ml of water. After a rubber cork is
placed in the graduated cylinder, the volume of the water rises to 53.0 ml. If
the mass of the rubber cork is 4.3 g, what is its density?
4.) Calculate the volume of a book with a density of 9.9 g/cm3 and a mass of 58.5 g.
5.) Find the mass of iron if its density is 6.7 g/ml and it has a volume of 5 ml.
1.)
density is found by [tex]\rho=\frac{m}{V}[/tex]
[tex]\rho=\frac{3.1}{0.35}\\\\ \rho=8.857 g/cm^3[/tex]
2.)
Volume is [tex]lwh[/tex]
7*10*5
V=350[tex]cm^3[/tex]
3.)
using the density formula
[tex]\rho=\frac{m}{V}[/tex]
[tex]\rho=\frac{4.3}{3}[/tex]
[tex]\rho=1.43g/ml[/tex]
4.)
rearrange the density formula for V
[tex]V=\frac{m}{\rho}[/tex]
[tex]V=\frac{58.5}{9.9}\\\\ V=5.909cm^3[/tex]
5.)
rearrange the density formula for [tex]m[/tex]
[tex]m=\rho V\\\\m=(6.7)(5)\\\\m=33.5g[/tex]
Calculate the mass of 1.25 mol ammonium sulfide, (NH4)2S. *
Answer:
85g
Explanation:
To convert the moles of a substance to grams we need to know the molar mass of the substance. We, as first, must obtain the molar mass of (NH₄)₂S as follows:
There are 2 atoms of N, 8 of H and 1 of S:
N = 2*14g/mol = 28g/mol
H = 8*1g/mol = 8g/mol
S = 1*32g/mol = 32g/mol
Molar mass: 68g/mol
That means 1 mole of (NH₄)₂S has a mass of 68g.
1.25moles have a mass of:
1.25moles * (68g/mol) =
85gSubstances that can either take up hydrogen ions or release hydroxide ions into water are called.
Bases are substances that can release hydroxide ions or take up hydrogen ions into the water.
Bases are those substances that have a pH above 7. They are bitter. When bases are added to water, they release hydroxide ions. And takes up hydrogen ions. Bases that fall at the pH of 8 are considered weak bases whereas those bases that fall at the pH of 14 are considered strong bases. A few examples of bases are sodium hydroxide, calcium hydroxide, potassium hydroxide, etc.
[tex]NaOH + H _{2}O→ Na ^{ + } + OH ^{ - } [/tex]
Substances that fall within the pH of 7 are considered neutral substances.
Acids are substances that have a pH below 7. They are sour. When acids are added to water they release hydrogen ions. Acids that fall at the pH of 6 are considered weak acids whereas those bases that fall at the pH of 1 are considered strong acids. A few examples of acids are acetic acid, hydrochloric acid, sulphuric acid, nitric acid, etc.
[tex]CH _{3}COOH + H _{2} O→COO ^{ - } + H ^{ + } [/tex]
Therefore, the substances that release hydroxide ions or take up hydrogen ions into the water are known as bases.
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ASAP please and Thankyou
Answer:
c
Explanation:
There are four boxes so each are 25%.
Red = 25%
Red and White = 50%
White = 25%
Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?
Ar
Kr
Xe
Rn
Answer:
Kr
Explanation:
Just took the test
Why are yeast cells used in making bread?
Answer:
Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.
Explanation:
In Niel’s Bohr’s model of the atom, electron move like?
Answer:
They move in fixed orbits around the nucleus.
Explanation:
In the Bohr model, it shows the electrons moving in fixed paths around the nucleus, making it easier to see and count them.
Answer:
Pretty sure the electrons orbit.
Explanation:
How hot would the water be if all the light reaching the two beakers had been transmitted
If the light completely falls on the two beakers, the degree of hotness increases with respect to time, while if the light is transmitted, the water would gradually cool down.
What is the effect of transmitted light on temperature?The effect of transmitted light on temperature is understood by the fact that the intensity of transmitted light became maximum during the process of cooling. While it gets the opposite when the water warms significantly.
According to the context of this question, if all the light reaching the two beakers had been transmitted, the degree of hotness of the water gradually declines. Due to this, the water in the two beakers cool down.
Therefore, the water cools slowly if all the light reaching the two beakers had been transmitted.
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......................................
Answer:
Explanation:
yes leon is correct because matter is anything that takes space and also has mass in it.
thks.
You need 150g of pure lithium for an experiment you're doing. You have 675g of lithium oxide (Li2O). Can you extract all the lithium you need from the amount of compound you have? Show your reasoning.
Answer: Yes we can extract all the lithium from the amount of compound we have.
Explanation:
To calculate the moles :
[tex]moles=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Moles of} Li=\frac{150g}{7g/mol}=21.4moles[/tex]
[tex]\text{Moles of} Li_2O=\frac{675g}{30g/mol}=22.5moles[/tex]
[tex]2Li_2O\rightarrow 4Li+O_2[/tex]
According to stoichiometry :
2 moles of [tex]Li_2O[/tex] produce 4 moles of [tex]Li[/tex]
Thus 22.5 moles of [tex]Li_2O[/tex] will produce=[tex]\frac{4}{2}\times 22.5=45moles[/tex] of Li
As 21.4 moles is a lesser quantity than 45 moles, thus it can be produced
Yes, you can extract all the lithium you need from the compound
We'll begin by calculating the mass of lithium, Li in 1 mole of Li₂O. This can be obtained as described below:
1 mole of Li₂O = (2×7) + 16
1 mole of Li₂O = 14 + 16 = 30 g
SUMMARY
30 g of Li₂O contains 14 g of Li.
With the above information in mind, we can determine the mass of Li in 675 g of lithium oxide, Li₂O. This can be obtained as follow:30 g of Li₂O contains 14 g of Li.
Therefore,
675 g of Li₂O Will contain = (675 × 14)/30 = 315 g of Li.
From the calculation made above, we can see that there are 315 g of Li in 675 g of Li₂O. Thus, we can conclude that 150 g of Li can be extracted from the compound (i.e 675 g of Li₂O)Learn more: https://brainly.com/question/15381525
Would neon (ne) normally be expected to form compounds? a. yes, because neon has eight electrons in its outermost level and is unreactive b. no, because neon has eight electrons in its outermost level and is unreactive c. yes, because neon needs six electrons to fill its outermost level d. no, because neon needs six electrons to fill its outermost level
No, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.
Neon belongs to the Group 18 of the periodic table.
The other elements(Helium, argon, krypton, radon, xenon) along with neon present in group 18 are known as noble gases.
All the elements of this group are unreactive and gases.
All these gases except Helium have 8 electrons in their outermost level, which is a stable electronic configuration.
As they have a stable electronic configuration, they don’t have any tendency to accept electrons from other elements or donate their electrons, which makes them unreactive.
Thus, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.
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10. Overpopulation occurs when the number of organisms of a species
exceeds the ecosystem's carrying capacity.
True
O False
True.
However, overpopulation also increases if there is a shortage in the population of consumers. As a result population of producers increase.
Answer:
True (statement is correct)
Explanation:
Yeah, overpopulation occurs when the number of organisms of a species exceeds the ecosystem's carrying capacity. Hence, the given statement is correct (true).
whoever answers this first gets brainly
Answer:
D. lysosome
Explanation:
hope it helps :D
sorry if its wrong :/
Please help me to do this assignment
Answer:
1. Objective
2. Objective
3. Opinion
4. Objective
5. Opinion
6. Opinion
7. Opinion (I think.)
8. Opinion (I think.)
Explanation:
MULTIPLE CHOICE QUESTION
In an ionic bond, metals will
Gain electrons to form positive ions
Lose electrons to form positive ions
Gain electrons to form negative ions
Lose electrons to from negative ions
Answer:
B) Lose electrons to form positive ions
Explanation:
HELP ME ASAP PLEASE LOTS OF POINTS
Determine the average atomic mass of Sulfur, given the following:
There are 3 isotopes of the element Sulfur the mass numbers and abundances are as follows:
S-32: 94.99%; S-33: .75%; S-34: 4.26%
Answer: 32.06 atomic mass units
Explanation:
If you were to measure the mass of magnesium and hydrochloric acid before combining them in the test tube, how would that mass compare to the mass of reactants left in the test tube after the reaction? Explain your answer and how it corresponds to the law of conservation of mass.
Answer:
Answer: The mass of product left in the test tube will be less than the initial measured mass of the reactants.
Explanation: This is because one of the products of the reaction is a gas (hydrogen) and it escapes as the reaction happens in an open system.
This is the reaction,
Mg(s) + 2HCl(aq) --------> MgCl2(aq) + H2(g)
So, evidently, only MgCl2 is left in the reaction test tube together with unreacted reactants.
But, the hydrogen gas that escapes accounts for the lesser mass at the end of the reaction.
The mass in the test tube at the end of the reaction +
the mass of Hydrogen gas that escapes = the mass of reactants before the reaction; consolidating the law of conservation of mass.
What is the boiling point (in C) of a 0.743 m
aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
The boiling point (in C) of a 0.743 m aqueous solution of KCI : 100.7608°C
Further explanationSolutions from volatile substances have a higher boiling point and lower freezing points than the solvent
ΔTb = Tb solution - Tb solvent
ΔTb = boiling point elevation
[tex]\large {\boxed {\boxed {\bold {\Delta Tb \: = \: Kb.m}}}[/tex]
For electrolyte solutions there is a van't Hoff factor = i
i = 1 + (n-1) α
n = number of ions from the electrolyte
α = degree of ionization, strong electrolyte α = 1, for non electrolytes i = 1
KCl⇒K⁺+Cl⁻⇒ electrolyte solution(2 ions K⁺ and Cl⁻), strong electrolyte α = 1
ΔTb=Kb.m.i
i = 1 + (n-1) α
i=1+(2-1).1=2
Kb for water (solvent) : 0.512 °C kg/mol
molal KCl = 0.743 m
The boiling point of solution :
[tex]\tt Tb-100=0.512\times 0.743\times 2\\\\Tb-100=0.7608\\\\Tb=100.7608^OC[/tex]
The correct answer is 100.761.
ionic bonding occurs when ______ atom donates one or more _______ to a _______ atom
Answer:
ionic bonding occurs when unstable atoms donates one or more valence electrons to a unstable atom
Explanation:
Conductivity is directly related to the number of ions present in a solution. Insoluble compounds do not dissociate to any appreciable extent. What kind of conductivity would you expect such a solution to have?.
Answer: Referring to a solution that does not completely disassociate, the conductivity would be low.
Explanation: Ions that are completely disassociated conduct better than ions that still are connected by bonds.
The kind of conductivity that would you expect insoluble compounds have is very poor or low. Due to this, these compounds do not dissociate to any appreciable extent.
How is Conductivity measured?Conductivity is measured through the utilization of salinity measurement. This measurement most frequently determines the parts per thousand or grams per liter.
A Siemen is also referred to as its smaller equivalents, the milli-Siemen, and the micro-Siemen, which are each one-millionth of a Siemen, is a unit used to determine the conductivity of any given solution.
Some solutions like NaCl, HCl, NaOH, etc have high electrical conductivity because they readily dissociate into their ions. While insoluble compounds do not have this capability to dissociation, so they generally have low or poor electrical conductivity.
Therefore, insoluble compounds generally have low or poor electrical conductivity.
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19. A 75-kg piano is hoisted on a crane and delivered through the window of a 6th-story apartment (20
meters above the ground). What is the potential energy of the piano?
20. (ALGEBRA CHALLENGE) The potential energy of a 40-kg cannon ball is 14000 J. How high was the
cannon ball to have this much potential energy?
(19) The potential energy of the piano is 14700 J.
(20) The height of the cannon ball is 35.71 m.
What is potential energy?This can be defined as the energy of a body due to its position in the gravitational field.
(19) To calculate the potential energy of the piano, we use the formula below.
Formula:
P = mgh.............. Equation 1Where:
P = Potential energy of the pianom = mass of the pianoh = Height of the pianog = Acceleration due to gravityFrom the question,
Given:
m = 75 kgh = 20 mg = 9.8 m/s²Substitute these values intyo equation 1
P = 75×20×9.8P = 14700 J(20) To calculate the heigth of the cannon ball we use the formula below.
h = P/mg................... Equation 2From the question,
Given:
P = 14000 Jm = 40 kgg = 9.8 m/s²Substitute these values into equation 2
h = 14000/(40×9.8)h = 35.71 mHence, (19) The potential energy of the piano is 14700 J and (20) The height of the cannon ball is 35.71 m
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Juan wanted to investigate how exercise affects heart rate. a classmate sat quietly for 5 minutes before juan used a stopwatch to count her pulse for 15 seconds. a second classmate ran in place for 5 minutes before juan used the stopwatch to find his pulse rate for 15 seconds. after both measurements, juan multiplied the number by 4 to determine hear rate per minute. what did juan do wrong in this investigation? what should juan have done instead?
The wrong Juan did in this investigation is he multiplied by 4 and did not count it for 60 seconds to calculate the heart rate per minute.
What to do to know the pulse rate or heart beat and what did Juan did wrong?See to know the heart beat or pulse rate we simply do it for 60 seconds because we generally obtain the data for a minute .Here Juan is investigating the heart rate for 15 seconds .Plus the the cardinal mistake he did was he multiplied the beats by 4 of both the classmate knowing a student just rushed into the classroom and is exercised.So obviously the student who just arrived the classroom would have high heart rates comparatively.Calculating both heart rates and multiplying with 4 is the main mistake Juan is commiting.To know more about heart rate visit:
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What is the importance of the fundamental laws of chemistry?
Law of Conservation of mass: Mass cannot be created nor destroyed. Reference: Antoine Lavoisier – By carefully weighing the reactants & products of chemical reactions. The laws of chemical combination describe the basic principles obeyed by interacting atoms and molecules, interactions that can include many different combinations that happen in many different ways. This amazing diversity of interactions allows for an astounding variety of chemical reactions and compounds. The most fundamental concept in chemistry is the law of conservation of mass, which states that there is no detectable change in the quantity of matter during an ordinary chemical reaction. Modern chemistry is based on several fundamental laws, including:
The law of multiple proportions.The law of definite proportions.The law of conservation of mass.An atom has a diameter of 2.00 Å and the nucleus of that atom has a diameter of 9.50×10−5 Å . Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere.
fraction of the volume of the atom that is taken up by the nucleus is 1.07x10⁻¹³Å³
Sphere volume is calculated by formula =
V=4/3(πr³) , V is volume , r is radius
Radius = diameter/2
Radius of atom = 2/2=1
Radius of nucleus = (9.50x10⁻⁵)/2 = 4.75x10⁻⁵
now we may calculate the volume for the atom and the nucleus
atom volume = (4/3) × 3.14 × (1 )³ = 4.186 ų
nucleus volume = (4/3) × 3.14 × (4.75× 10⁻⁵)³ = 4.48 × 10⁻¹³Å³
now the fraction of volume of the atom that is taken up by the nucleus:
fraction = nucleus volume / atom volume
fraction =4.48 × 10⁻¹³/4.186 = 1.07x10⁻¹³Å³
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In a solid, the particles..
A. Vibrate in place
B. Overcome the strong attraction
C. Slide past one another
D. Move freely
CHOOSE ONE AND I WILK GIEV YOU BRAINLIEST AND DONT GUESS PLEASE!!!..
Answer:
c
Explanation: