Answer:
I think the answers D. Hope this helps you.
Explanation:
_Na2S + _HCl -> NaCl + H2S
which of the following coefficients would balance this equation?
a. 2, 1, 2, 1
b. 1, 2, 1, 2
c. 1, 2, 2, 1
d. 2, 1, 1, 2
Answer:
C: 1, 2, 2, 1
Explanation:
_Na2S + _HCl -> NaCl + H2S (unbalanced)
1Na2S + 2HCl -> 2NaCl + 1H2S
Na2S + 2HCl → 2NaCl + H2S (Balanced)
Hope this helps:)
Answer:
c. 1,2,2,1
Explanation:
Na2S + 2HCl -> 2NaCl + H2S
what weighs more, a proton, neutron, or electron?
Answer:
Neutron I think.
Explanation:
:)
Answer:
Neutrons
They contribute in the mass of an atom not its charge
plz help me out!!!!!
Is there a common denominator for elastic shocks, completely inelastic shocks and explosions?
Answer:
i am not 100% sure but im pretty sure there is.
Explanation:
Groundwater refers to which of the following?
Answer:
The term groundwater refers primarily to underground rivers and lakes
but what r the options tho?
Element X has an average atomic mass of 64.32 amu. If this element consists of only two isotopes, X-64 and X-65, which isotope is present in the greater abundance? Explain how you can tell.
Answer:X-64 is closer to the atomic mass of 64.32 amu. The one on the periodic table is the isotope most common in nature.
Explanation:
The average atomic mass of an element can be calculated from the percentage abundance and atomic masses of its isotopes. The atomic mass of the element is 64.32 amu which is near to the mass of X-64. Thus the percentage abundance of X-64 will be greater.
What is isotope?Isotopes are atoms of same atomic number and different mass numbers. There many elements which are having both stable and unstable isotopes. The unstable isotopes may undergo radioactive decay and forms a new stable isotope.
Let the fraction of abundance of X-64 be x and the that of X-65 is 1-x. Since total is 100%. Now,
64 (x) + 65 (1-x) = 64.32
x = 0.68.
Thus percentage abundance of X-64 is 68 % and that of X-65 is 100 - 68 = 32 %.
Therefore, the percentage abundance of the element X with isotopes X-64 is having greater abundance.
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a) The volume of one mole of gaseous nitrogen at standard temperature and pressure is 22.4 L. The density of liquid nitrogen at -196°C is 0.808 g/mL. What is the volume of one mole of liquid nitrogen?
Answer:
34.653mL or 0.03465L
Explanation:
Density (g/mL) = mass (g) / volume (mL)
The mass of one mole of liquid nitrogen is 14g for one atom × 2 moles = 28mol.
Since density of the liquid nitrogen is 0.808 g/mL, the volume can be calculated thus:
Volume = mass/density
Volume = 28/0.808
Volume = 34.653mL
In litres, the volume will be 0.03465L
Observe the data chart below and explain how the mass of each ball affects its motion.
Baseball Bowling Ball Beach Ball Tennis Ball
400 grams 900 grams 10 grams 60 grams
answer
The beach ball will go the farthest because it's the lightest.
The tennis ball will go second farthest because it is the second lightest.
The baseball will go the third farthest because it is th third lightest'
The bowling ball will go the least far because it is the last farthest
From the given data chart, the way the mass of each ball affects its motion is that;
The highest mass will have the slowest motion while the least mass will have the fastest motion.
We are given;
Mass of baseball = 400 g
Mass of bowling ball = 900 g
Mass of beach ball = 10 g
Mass of tennis ball = 60 g
Now, according to Newton's first law of motion, the greater the mass of an object, the greater the inertia. This means that objects of higher mass would travel at slower motion than objects of lower mass because objects of higher mass would possess greater inertia.
Thus, looking at the masses of the objects given, the highest mass is 900g which is the mass of the bowling ball. Thus, it will be the slowest.
Next is baseball with 400g which is the third fastest motion.
Next is tennis ball with 60 g which is the second fastest motion
Next is beach ball with 10 g which is the fastest motion.
Read more;https://brainly.com/question/19087785
An isotope has three forms. 30% have a mass of 15 amu, 20% have a mass of 16 amu and 50% have a mass of 17 amu. What is the average atomic
mass of this element?
a. 15.8 amu
b. 16.0 amu
c. 16.2 amu
d. 16.4 amu
Answer:
Explanation:
a
True or false: The atomic mass of an element can often be found below its chemical symbol on the periodic table.
Answer:
True
Explanation:
Make me Brainliest
I did the test Enjoy!!
QUESTION 15
0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same
A. Density
B. Mass
C. Volume
D.Atoms
Answer:
D. Atoms
Explanation:
a mole is defined using particles, which may be atoms, molecules, ions, or electrons.
what are the minerals responsible for the production of co2 gas in the kiln
Answer:
Explanation:limestone
CO2 is emitted from the calcination process of limestone, from combustion of fuels in the kiln, as well as from power generation.
What is the relationship between atoms and malodorous
A teacher place a plastic cup of one coffee with a lid and the freezer which statement describes the frozen coffee in comparison with the warm coffee
Answer: The amount of coffee is the same
Explanation: This was the correct answer for me.
Answer:the amount of coffee is The same
Explanation:I took the test
Why does Fluorine have a higher electronegativity than lodine ?
Answer:
Fluorine is more electronegative than iodine because atom size of F is less than I so the tendency to attract electron increases.
Which condition is necessary for a mold fossil to form? The fossil must be preserved in amber. Minerals must replace the remains. The mold must be filled with sediment. Hard parts of the organism must dissolve.
Answer:
Hard parts of the organism must dissolve
Explanation:
I just took the quiz/test and got it right
Answer:
Hard parts of the organism must dissolve
The definition of is the study of quantitative relationships between the amounts of reactants and products.
a)chemical equations
b) stoichiometry
c) molar mass
d)coefficient
Answer:
b) stoichiometry
Explanation:
Stoichiometry is the study of quantitative relationships between the amounts of reactants and products.
The word is coined from two Greek words; stoicheon which means atom and metron which means measurement. It deals with chemical calculations based on the elementary particles of matter. Such calculations highlights the relationships between the composition or chemical reactions of matter and the mole.Which graph represents an object that is decreasing in speed
Answer:
The first one
Explanation:
please help and show work, i will mark you brainlest
Answer:
7x-2(3-4)-2
Pls help
Explanation:
HELP ASAP PLZ!!!! Balance the following equation using whole numbers. What is the coefficient for SiO2? Si12H26+O2⟶SiO2+H2O
Answer:
I believe Si12H26+02 is the coefficient I might be wrong, Sorry if I am.
An irregular shaped piece of metal wha a mass of 0.251 lb was placed into a graduated cylinder containing 50.00 mL of water; this raised the water to 67.50 mL.
What is the density, in g/cm3, of the metal?
Answer:
[tex]\rho= 6.51g/cm^3[/tex]
Explanation:
Hello!
In this case, since the density is defined as the degree of compactness of a substance, and is defined as the mass over the volume:
[tex]\rho= \frac{m}{V}[/tex]
Given the displaced volume, we can compute the volume of the piece of metal via the following subtraction:
[tex]V=67.50mL-50.00mL=17.50mL=17.50cm^3[/tex]
Since the piece of metal displaces the water to the final volume. Moreover, given the mass in lb, we compute it grams as follows:
[tex]m=0.251lb*\frac{453.6g}{1lb} =113.85g[/tex]
Thus, the density turns out:
[tex]\rho= \frac{113.85g}{17.50cm3}\\\\\rho= 6.51g/cm^3[/tex]
Best regards.
Which situation provides the best evidence that a chemical reaction is taking place?
A metal strip bends when heated.
A solution freezes in the freezer.
Two solutions mixed in a beaker produce a solid.
O A chemical completely dissolves in water and the temperature of the solution remains constant.
Answer: two solutions mixed in a beaker produce a solid
Explanation: it formed a new substance
Pick the correct answer. The waves cause the particles to vibrate
A.slower than the sound source
B.at the same rate as the sound source
C.faster than the sound source
Answer:
its a
Explanation:
give me brainliest plzz
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The correct option is option A.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
The vibration of particles near the sound source is higher than in the wave.
Therefore, the waves cause the particles to vibrate slower than the sound source. The correct option is option A.
.
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Which refers to the rate of change in velocity?
speed
acceleration
direction
magnitude
Answer:
Acceleration
Explanation:
Acceleration Is the rate change in velocity
Acceleration refers to the rate of change in velocity.
What is acceleration?
In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the orientation of the net force acting on that object. The magnitude of an object's acceleration, as described by Newton's Second Law,is the combined effect of two causes:
1) the net balance of all external forces acting onto that object — magnitude is directly proportional to this net resulting force;
2)that object's mass, depending on the materials out of which it is made — magnitude is inversely proportional to the object's mass.
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What mass of aluminum (in g) would be
required to completely react with 1.30 L of
0.350 M HCl in the following chemical
reaction?
2 Al(s) + 6 HCl(aq) → 2 AICI: (aq) + 3 H2(g)
Mass of Aluminum (in g) : 4.104
Further explanationReaction
2 Al(s) + 6 HCl(aq) → 2 AICI₃ (aq) + 3 H₂(g)
mol HCl :
[tex]\tt 1.3\times 0.35=0.455[/tex]
mol Al :
[tex]\tt \dfrac{2}{6}\times 0.455=0.152[/tex]
mass of Aluminum :
[tex]\tt 0.152\times 27~g/mol=4.104~g[/tex]
A 50.0 ml sample of 0.200 M HNO2 (weak acid) is titrated with 0.400 M
KOH. Calculate the pH after addition of 25 ml KOH (Ky for HNO, is 4.6 x
10-4)
O a 6.67
O b. 7.67
O c.8.23
O d. 9.12
pH = 8.23
Further explanationReaction
HNO₂+KOH⇒KNO₂+H₂O
mol HNO₂ = 50 x 0.2 = 10 mlmol
mol KOH = 0.4 x 25 = 10 ml mol
Both of them completely react, resulting in hydrolysis salt which is composed of weak acids and strong bases
Formula :
[tex]\tt [OH^-]=\sqrt{\dfrac{Kw}{Ka}.M }[/tex]
Kw = water constant = 10⁻¹⁴
Ka = 4.6 x 10⁻⁴
M = anion (salt) concentration =
[tex]\tt \dfrac{mol~KNO_2}{total~volume}=\dfrac{10}{50+25}=0.133~M[/tex]
[tex]\tt [OH^-]=\sqrt{\dfrac{10^{14}}{4.6\times 10^{-4}} }\times 0.133\\\\(OH^-)=1.7\times 10^{-6}\\\\pOH=6-log~1.7=5.77\\\\pH+pOH=14\\\\pH+5.77=14\\\\pH=8.23[/tex]
Write a complete balanced equation for: magnesium(s) + chloric acid (aq) ? + ?
Identify whether each element is a halogen, a noble gas, or nonmetal only. Astatine (At): Nitrogen (N): Krypton (Kr): Chlorine (Cl): Sulfur (S):
Answer:
Astatine and chlorine are halogens only. Nitrogen and sulfur are non metals only. Krypton (Kr) is noble gas only.
Explanation:
Answer:
halogens only
non metals only
noble gas only
halogen
non metals only
Explanation:
i hope this helps :]
What is the wavelength of a light wave with a frequency of 8.96 x 1014 Hz
6
9
Question 22 (2.5 points)
Based on the following balanced equation, how many moles of H2O can form from the reaction of 6 moles of
CHA?
CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H20 (g)
12
a) 3
15
b) 18
o
18
c) 6
d) 12
21
Answer:
d) 12
Explanation:
Given data:
Moles of CH₄ react = 6 mole
Moles of water formed = ?
Solution:
CH₄ + 2O₂ → CO₂ + 2H₂O
Now we will compare the moles of CH₄ with water.
CH₄ : H₂O
1 : 2
6 : 2/1×6 = 12 moles
Thus from 6 moles of CH₄ 12 moles of water produced.
Seismic waves travel at different speeds according to type.
What is the speed of seismic waves from fastest to slowest?
L waves, S waves, P waves
P waves, L waves, S waves
P waves, S waves, L waves
S waves, L waves, P waves
Answer:
I believe the answer would probably most likely read D in my point of view that's what I think so I can get the answer wrong
Answer:
D
Explanation:
