Answers
Answer: B
Explanation:
I hope this helps you
Related Questions
Which question is answered by the paragraph?
Read this paragraph by the National Aeronautics and
Space Administration (NASA) about black holes.
Don't let the name fool you: A black hole is anything but
empty space. Rather, it is a great amount of matter
packed into a very small area - think of a star ten times
more massive than the Sun squeezed into a sphere
approximately the diameter of New York City. The result
is a gravitational field so powerful that nothing, not even
light, can escape. In recent years, NASA instruments
have painted a new picture of these strange objects
that are, to many, the most fascinating objects in space.
O Which NASA instruments are used to study black
holes?
O How much light exists inside black holes?
How strong is the gravity force of black holes?
O How large in diameter are most black holes?
.
Answers
Answer:
how strong the gravity force of black holes ?
Answer:
The awnser is C, have a good day!
Explanation:
The common isotopes of carbon are 12C and 13C. The average mass of carbon is 12.01115 amu. What is the abundance of the 13C isotope? A. 1.115% B. 98.885% C. 0.480% D. 99.52% Provide an explanation if possible. Thanks so much!
Answers
Answer:
The abundance of the 13C isotope is 1.115%
Explanation:
The given information are;
Common isotope of carbon are 12C and 13C
The formula for calculating the relative atomic mass is the observed mass multiplied by the percentage abundance at that mass given as follows;
M₁ X₁ + M₂X₂ = Relative atomic mass
Where:
X₁ + X₂ = 1 as these are percentage represented as fractions
Let M₁ = 12 for 12C and M₂ = 13 for 13C
X₁ = Relative abundance fraction of 12C
X₂ = Relative abundance fraction of 13C
We have;
12X₁ + 13X₂ = 12.01115.......................(1)
X₁ + X₂ = 1............................................(2)
Which gives;
X₁ = 1 - X₂
Substituting the value for X₁ in equation (1) gives;
12(1 - X₂) + 13X₂ = 12.01115
13X₂ - 12X₂ + 12 = 12.01115
X₂ = 12.01115 - 12 = 0.01115
Therefore, the relative abundance fraction of 13C 0.01115 which in percentage is 100 × 0.01115 = 1.115%.
Rising magma pushes on the crust above it, which can cause ground
deformation. Which event is most likely to occur at this location?
O A. A tsunami
B. Liquefaction
C. An earthquake
O D. A volcanic eruption
SUBMIT
Answers
Answer:
D: A volcanic Eruption
Explanation:
I took the quiz! Hope this helps!
Which statement correctly describes Earth’s magnetic field?
A) A compass can lead a hiker to the geographic North Pole.
B) The magnetic pole near the South Pole is a north pole.
C) Compasses point toward a magnetic pole that is a north pole.
D) Field lines circle Earth from east to west.
Answers
Answer:
B) The magnetic pole near the South Pole is a north pole.
Explanation:
The north pole on the compass is the geographical South Pole.
Hope it helps.
Answer:
The answer is B.
Explanation:
For the reaction Pb(NO3)2 + 2KI → Pbl2 + 2KNO3, how many moles of lead iodide are produced from 189.9 g of
potassium iodide?
Select one:
O a. 0.572
Ob. 4.38e4
O c. 1.24
O d. 1.24
PLEASE HELP
Answers
Based on difference in electro negatives between atoms, which is the most polar bond pair? A. H — S B. H — CI C. H — O D. H — F (Put a explanation)
Answers
Good luck
Answer:
the option c is correct H-oExplanation:
I hope this helps u have a nice dayWhat is measured by the reaction rate? the probability that a reaction will occur the speed at which products form the time required for a reaction to go to completion
Answers
Answer: the speed at which products form
Explanation:
Rate of a reaction is defined as the speed at which a chemical reaction proceeds. It is often expressed in terms of the concentration of a reactant that is consumed in a unit time or the concentration of a product that is formed in a unit of time.
For a general reaction :[tex]A\rightarrow B[/tex]
[tex]Rate=-\frac{d[A]}{dt}[/tex]
or [tex]Rate=+\frac{d[B]}{dt}[/tex]
where d[A] = change in concentration of reactant A
d[B] = change in concentration of product B
dt = time interval
some magnesium powder was mixed with some copper( II)oxide and heated strongly. there was a victorious reaction producing a lot of sparks and a bright flash of light.
1) name the products of the reaction
2)write a balanced equation for the reaction.
plzzzzz help!!!
Answers
Answer:
See below.
Explanation:
1) Magnesium oxide MgO and copper metal (Cu).
2) Mg + CuO ---> MgO + Cu.
Magnesium oxide MgO and copper metal (Cu) products of the reaction
The balanced equation for the chemical reaction is
Mg + CuO ---> MgO + Cu.
What are the steps for writing a balanced equation ?The chemical equation represents two sides separated by an arrow where the left side indicates reactants and right side indicate the products.
it also represent the formulas of the participant elements, their phases like solid, liquid, gas, the direction of the reaction, and the amount of each substance.
Chemical equations will be balanced marking their mass and charge which means the number and type of atoms on the left side is the same as the number of type of atoms on the right side.
The overall electrical charge of the reaction on both the left side and right side will be same for the equation.
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Which two practices are examples of how people use science?
O A. Explaining natural events using facts and data
B. Developing theories using many lines of evidence
C. Explaining natural events using myths and legends
D. Developing stories that enhance culture and share beliefs
Answers
B. Developing theories using many lines of evidence
Answer:
B.
Explanation:
Consider preparing ammonia gas by the following reaction:
N2(g) + 3H2(g) ===> 2NH3(g)
If you have 28.02 g of N2 and excess H2, how many grams of NH3(g) can be produced.
6.06g
14.01g
34.08 g
68.16 g
28.02g
Answers
Answer:
34.08g
Explanation:
(Take the atomic mass of N=14.0, H=1.0)
no. of moles = mass / molar mass
no. of moles of N2 used = 28.02 / (14x2)
= 1 mol
Since H2 is in excess and N2 is the limiting reagent, the no. of moles of NH3 produced depends on the no. of moles of N2 used.
From the equation, the mole ratio of N2:NH3 = 1: 2,
which means one mole of N2 produces 2 moles of NH3.
From the ratio, we can deduce the no. of moles of NH3 produced = 1 x 2 =2moles.
Mass = no. of moles x molar mass
Mass of NH3 produced = 2 x (14.0+1.0x3)
= 34g
≈34.08g (this happens because the atomic mass I took is only corrected to 1 decimal place, but in the end, this is only a very small error in the decimals. Make sure you take a look if the question provides the atomic mass:) )
How many grams of lactic acid (C,H,O) are in 1 liter of a 0.5M solution of lactic acid?
And how many grams of lactic acid are in the above solution?
Answers
Answer:
a mole of lactic acid = 90 g
a 0.5 M solution would require 1/2 mol or 45 g
Explanation:
The molecular mass is 90 d, the combined atomic masses of its atoms.
There are 45 grams of lactic acid in 1 liter of a 0.5M solution of lactic acid
CALCULATE THE NUMBER OF MOLES IN THE SOLUTION:
The number of moles of lactic acid (C3H6O3) in the solution can be calculated by multiplying the molarity (M) of the solution by its volume (L). That is;no. of moles = molarity × volume
According to this question, the 1L lactic acid solution has a molarity of 0.5M, hence, the number of moles is calculated as follows:no. of moles = 1 × 0.5
no. of moles = 0.5moles of lactic acid
CALCULATE THE MASS OF LACTIC ACID:
The mass in grams of lactic acid can be calculated by multiplying the molecular mass of lactic acid (C3H6O3) by its number of moles i.e.Mass = no. of moles × molar mass
Molar mass of (C3H6O3) = 12(3) + 1(6) + 16(3)
= 36 + 6 + 48
= 90g/mol
Mass of lactic acid = 0.5 mol × 90 g/mol
Mass of lactic acid = 45grams.
Hence, there are 45 grams of lactic acid in 1 liter of a 0.5M solution of lactic acid.
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Bee stings release methanoic acid which attacks the nerves in the skin. They can be
neutralized by applying a cream that contains
a) ammonia
b) vitamin C
c) sulphur dioxide
d) acetic acid (vinegar)
Answers
Answer:and so an acid should be applied to neutralize them and remove the pain.
Explanation:Bee and Wasp stings can be both painful and itchy, and are very common ... Many common household substances can be used for this, and vinegar and ... If you are near other Bees and Wasps,
Ammonia can be used to neutralise. Hence, option A is correct.
What is methanoic acid?It is the simplest carboxylic acid which consists of a single carboxylic acid group (COOH) which is attached to a hydrogen atom.
Ammonia is a great way to help neutralise the venom of a bee sting. All you need to do is create a thick paste out of baking soda and water and apply it to the sting.
Hence, option A is correct.
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What is the mass, in grams of 0.500 moles of CuBr2?
Answers
Answer:
111.677 grams
Explanation:
1 moles of CuBr2 is equal to 223.354 grams.
0.5 moles of CuBr2 would be 223.354(0.5) = 111.677 grams.
Which element has a larger atomic radius than aluminum (AI)?
The Periodic Table
O A. Boron (B)
B. Silicon (Si)
O C. Nitrogen (N)
O D. Sodium (Na)
Answers
Answer:
The correct answer is D because i did this before and got it right.
Explanation:
The s orbital can hold
A. eight electrons.
B. two electrons.
C. six electrons.
D. 12 electrons.
Answers
Answer:
B. Two electrons
Explanation:
Since the S orbital is closest to the nucleus and it only has one orbital, it can only hold 2 electrons
Because it is nearest to nucleus
So we can fill two electrons only
Which phrase describes an irregular galaxy?
O has a round shape
O contains many young stars
O has arms that extend from the center
O is larger than other types of galaxies
Answers
Answer: The answer would be B. contains many young stars.
Explanation:
There is very little new star formation in Irregular galaxies. Irregular galaxies have no particular shape and are smaller than other types of galaxies.
The irregular galaxy possess many young stars.
Irregular galaxyThey are the most unusual of galaxies.
They do not fit into either the elliptical or spiral galaxy categories.
They do not possess nice spiral arm, however, they do possess dark patches of dust and gas.
The irregular galaxies do not possess definite shape.
They comprise of several young stars as the extent of the formation of stars in irregular galaxies in brisk. They also do comprise old stars.
Thus, the correct statement is contains many young stars.
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Which noble gases can form compounds and under what conditions? Give EXAMPLES
Answers
Answer:
Following
Explanation:
Calculate the number of moles in 25.0 g of each of the
following:
a. He
b. 02
c. Al(OH)3
d. Ga S3
e. C4H10, butane
Answers
Answer:
A. 6.25moles
B. 0.78moles
C. 0.32moles
D. 0.15moles
E. 0.43moles
Explanation:
use
n = mass/molar massA. He
25/4 = 6.25molesB. O2
25/32 = 0.78molesC. Al(OH)3
27+ 3(17) = 7825/78 = 0.32 molesD. GaS3
70+3(32) = 16625/166 = 0.15molesE. C4H10
4(12)+10(1) =5825/58 = 0.43molesAccording to the mole concept, there are 6.25 moles, 0.78 moles,0.32
moles, 0.15 moles, 0.43 moles.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of moles=mass/molar mass
Thus, A. He,25/4 = 6.25 moles,B. O₂,25/32 = 0.78 moles,C. Al(OH)₃,25/78 = 0.32 moles,D. GaS₃,25/166 = 0.15 moles E. C₄H₁₀,25/58 = 0.43 moles.
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The table shows the electronegativity values of four unknown elements on the Pauling scale.
Electronegativity Values
Unknown Element Electronegativity
W
1.5
x
0.93
Y
2.0
Z
3.2
Which two elements are most likely to form an ionic bond together?
Answers
Answer:
X and Z
Explanation:
If the difference in electronegativity between two atoms is greater than 1.7, they will form an ionic bond.
W and Z: 3.2 - 1.5 = 1.7 no
X and Z: 3.2 - 0.93 = 2.27 yes
Y and Z: 3.2 - 2.0 = 1.2 no
W and Y: 2.0 - 1.5 = 0.5 no
X and Y: 2.0 - 0.93 = 1.07 no
W and X: 1.5 - 0.93 = 0.57 no
X and Z are most likely to form an ionic bond together.
Hope this helps.
Answer:
X and Z
Explanation:
ionic bonds form between elements with great differences between their respective electronegativity. X and Z have the greatest difference out of any other pair option given, thus they are most likely to bond ionically!
:) hope i help anyone
Which row in the table shows how many electrons there could be in the outer shell of an atom of V?
Answers
Answer:
Explanation:
The element V forms acidic oxide so it must be non- metal because oxides of non metal forms acidic oxide like sulphur ( s ) or chlorine ( Cl₂ )
sulphur forms SO₂ or SO₃ . Chlorine forms acidic oxide like Cl₂O₇ , Cl₂O₃ etc
These oxides are covalent compounds .
So V may have 6 or 7 electrons in the outermost orbit .
Hence option D is the right answer.
Question 7 of 32
1 Point
What is the purpose of environmental regulations on chemicals?
A. To prevent all chemicals from entering the environment
B. To make the production of chemicals more costly
O C. To only allow the use of chemicals that help the environment
O D. To protect the environment from harmful chemicals
Answers
Answer:O D to protect the environment from harmful chemicals
Explanation:
Scientists disagree about the possible effects of global warming. Please select the best answer from the choices provided T F this would be appreciated
Answers
Scientific evidence for warming of the climate system is unequivocal.
The current warming trend is of particular significance because most of it is extremely likely (greater than 95 percent probability) to be the result of human activity since the mid-20th century and proceeding at a rate that is unprecedented over decades to millennia.
Earth-orbiting satellites and other technological advances have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. This body of data, collected over many years, reveals the signals of a changing climate.
The heat-trapping nature of carbon dioxide and other gases was demonstrated in the mid-19th century.Their ability to affect the transfer of infrared energy through the atmosphere is the scientific basis of many instruments flown by NASA. There is no question that increased levels of greenhouse gases must cause the Earth to warm in response.
Answer:
this is false
Explanation:
HELP ME PLZ!!! I really dont know this!!! What characteristic of metals makes them good electrical conductors? -They have mobile protons. -They have mobile valence electrons. -Their crystal structures can be rearranged easily. -They have mobile cations.
Answers
Answer:
To have a high electrical conductivity, a normal metal should have mobile valence electrons and a long electron mean free path.
Explanation:
A long mean free path means that the electron goes a long distance between scattering events.
The characteristic of metals which makes them good electrical conductors is that they have mobile valence electrons.
What are the characteristics of metals?
An element is the simplest form of matter.Elements are further classified as metal,non -metals and metalloids. Metals possess luster and are malleable that is they can be drawn into thin sheets.They are also ductile and can be drawn into thin wires and are hard due to the strong ionic bonding present in them.
They are good conductors of electricity and heat as they have valence electrons which are mobile and can be easily be displaced if a current is allowed to pass through the metal, thus making it a good conductor.The conductivity of a metal is directly proportional to the number of valence electrons .
Higher the number of valence electrons, greater is the conductivity.Owing to the valence electrons,current can flow through the metal thus making it a good conductor.
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Which of the following is a polar molecule?
O A. A carbon monoxide molecule (CO)
OB. A linear carbon dioxide molecule (CO2)
OC. A calcium oxide molecule (Cao)
O D. An oxygen molecule (0)
Answers
Answer:
D. An oxygen molecule (0)
Explanation:
Hope it helps.
Given the following equation: 4 Fe + 3022 Fe2O3 What mass of iron is needed
to react with 12 grams of oxygen gas? *
Answers
Answer : The mass of iron needed is 29.5 grams.
Explanation : Given,
Mass of [tex]O_2[/tex] = 12 g
Molar mass of [tex]O_2[/tex] = 32 g/mol
First we have to calculate the moles of [tex]O_2[/tex].
[tex]\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}[/tex]
[tex]\text{Moles of }O_2=\frac{12g}{32g/mol}=0.375mol[/tex]
Now we have to calculate the moles of [tex]Fe[/tex]
The balanced chemical equation is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
From the reaction, we conclude that
As, 3 moles of [tex]O_2[/tex] react with 4 moles of [tex]Fe[/tex]
So, 0.375 mole of [tex]O_2[/tex] react with [tex]\frac{4}{3}\times 0.375=0.5[/tex] mole of [tex]Fe[/tex]
Now we have to calculate the mass of [tex]Fe[/tex]
[tex]\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe[/tex]
Molar mass of [tex]Fe[/tex] = 59 g/mole
[tex]\text{ Mass of }Fe=(0.5moles)\times (59g/mole)=29.5g[/tex]
Therefore, the mass of iron needed is 29.5 grams.
Which set of numbers gives the correct possible values of l for n = 3? 0, 1, 2 0, 1, 2, 3 –2, –1, 0, 1, 2 –3, –2, –1, 0, 1, 2, 3
Answers
Answer:
0, 1, 2
Explanation:
The rules for quantum numbers are:
n = 1, 2, 3, 4, …
l = 0, 1, 2, …, n - 1
mₗ = -l, -l + 1, …, 0, …, l - 1, l
If n = 3, l can go from 0 to 3 - 1 = 2.
The correct possible values of l are 0, 1, 2.
B is wrong because the maximum possible value of l is 2.
C and D are wrong because they contain negative numbers. They must be possible sets of magnetic quantum numbers, mₗ.
Answer:
A. 0,1,2
Explanation:
What is an example of an internal stimulus to which plants can respond? 1. temperature 2. hormones 3. soil conditions 4. light
Answers
Answer:
Hormones
Explanation:
Temperature, soil conditions, and light are all external stimuli that the plants can respond to; therefore, hormones would be the only internal stimulus.
Explain vapour pressure and surface tension What is plasma
Answers
Vapor Pressure: Measures how a substance is likey to evaporate
Surface Tension: is the attraction between liquid molecules.
Plasma: is an organic and inorganic substance that is typically found in blood
Calculate the temperature at
which the following reaction
becomes feasible:
4HCI + O2 -> 2Cl2 + 2H2O
Enthalpy: +280 kJ/mol
Entropy: +235 J/Kmol
A. 45.0 K
B. 65.80 K
C. 515.0 K
D. 1191.49 K
Reset Selection
Answers
Answer:
Option D. 1191.49 K
Explanation:
The following data were obtained from the question:
Change in enthalphy (ΔH) = 280 kJ/mol
Change in entropy (ΔS) = +235 J/Kmol
Temperature (T) =...?
Next, we shall express the enthalphy in joule (J). This is illustrated below:
1 KJ/mol = 1000 J/mol
Therefore, 280 kJ/mol = 280 x 1000 = 280000 J/mol
Therefore, 280 KJ/mol is equivalent to 280000 J/mol
Now, we can obtain the temperature at which the reaction was feasible as follow:
ΔS = ΔH/T
235 = 280000/ T
Cross multiply
235 x T = 280000
Divide both side by 235
T = 280000/235
T = 1191.49 K
Therefore, the temperature at which the reaction was feasible is 1191.49 K
Which statement describes what is gained or lost during radioactive decay?
Atoms gain other atoms.
Elements take in energy.
Atoms lose smaller particles.
Elements gain smaller particles.
only one answer
Answers
Answer:
The answer is
Atoms gain other atoms
Hope this helps you
Answer:
AAAAAAAAAAAA!!!!!!!
Explanation: