Answer:
Cr₂S₃
Explanation:
From the question given above, the following data were obtained:
Mass of chromium (Cr) = 0.67 g
Mass of chromium sulfide = 1.2888 g
Empirical formula =?
Next, we shall determine the mass of sulphur (S) in the compound. This can be obtained as follow:
Mass of chromium (Cr) = 0.67 g
Mass of chromium sulfide = 1.2888 g
Mass of sulphur (S) =?
Mass of S = (Mass of chromium sulfide) – (Mass of Cr)
Mass of S = 1.2888 – 0.67
Mass of S = 0.6188 g
Finally, we shall determine the empirical formula of the compound. This can be obtained as follow:
Mass of Cr = 0.67 g
Mass of S = 0.6188 g
Divide by their molar mass
Cr = 0.67 / 52 = 0.013
S = 0.6188 / 32 = 0.019
Divide by the smallest
Cr = 0.013 / 0.013 = 1
S = 0.019 / 0.013 = 1.46
Multiply by 2 to express in whole number
Cr = 1 × 2 = 2
S = 1.46 × 2 = 3
Therefore, the empirical formula of the compound is Cr₂S₃
The empirical formula will be "[tex]Cr_2 S_3[/tex]".
Given:
Mass of Cr,
0.67 gramMass of product,
1.2888 gramsNow,
→ [tex]Mass \ of \ Sulphur = Mass \ of \ product -Mass \ of \ Cr[/tex]
[tex]= 1.2888-0.67[/tex]
[tex]= 0.6188 \ g[/tex]
then,
→ [tex]Moles \ ratio \ of \ Cr:S = (\frac{0.67}{51.996} ): (\frac{0.61888}{32} )[/tex]
[tex]= 0.0129: 0.0194[/tex]
[tex]= 2:3[/tex]
Thus the above response is right.
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Arrange in terms on increasing ionization energy: H, K, Si, O
Answer:
K < Si < O < H
Explanation:
The ionization energy is regarded to be the amount of energy required to remove an electron in an atom from its ground state. The factor that determines the Ionization energy atomic radius. This is because the larger the atomic radius, the smaller the Ionization energy because of the shielding effect or screening effect of the inner shell electrons. Across the period, the ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increased nuclear charge. Also, down the period the ionization energy decreases because of increasing atomic radii and increasing shielding effect or screening effect of the inner shell electrons.
So, the increasing order of Ionization energy of the given elements are:
K < Si < O < H
Which of these is true for the electrons of an atom? Choose
O have a positive charge
O found in the nucleus along with the protons
O found in the space surrounding the nucleus
O are attached to the positive charge of neutrons
What
Answer:
The 3rd one " C " because it surrounds the nucleus it's not known the inside
An electron is found in the space surrounding the nucleus.
What is an electron?An electron is a sub-atomic particle which is found in the extra-nuclear part of an atom. They are found revolving int the shells which surround the nucleus.It carries a negative charge of minus 1 .
They are the elementary particles as they do not have known components or structure. It has a mass which is approximately equal 1/1836 th that of proton.No two electrons can occupy the same quantum state according to the Pauli exclusion principle.
As all elementary particles, it too does possess both particle and wave characteristics. They can collide with each other and cause diffraction . Wave properties of electrons are easier to observe with aid of experiments, because of lower mass and longer de Broglie wavelength.
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Calculate the density of an object that has a mass of 5.0g and a volume of 25.0mL?
Answer:
1/5g/ml
Explanation:
D=m/v
D=5.0/25
D=1/5g/ml
X-rays are electromagnetic waves that can penetrate skin, but not bone. In hospitals, X-rays are used to produce images of bones. How do X-rays compare to visible light? A. X-rays have a higher frequency and carry more energy than visible light. B. X-rays have a higher frequency and carry less energy than visible light. C. Visible light has a higher frequency and carries more energy than X-rays. D. Visible light has a higher frequency and carries less energy than X-rays.
Answer:
A. X-rays have a higher frequency and carry more energy than visible light.
Explanation:
Answer:
A. X-rays have a higher frequency and carry more energy than visible light
Explanation:
Both x-rays and visible light are electromagnetic waves.
The amount of energy carried by an electromagnetic wave depends on the frequency of the wave. The frequency of x-rays is greater than that of visible light, so the energy carried by x-rays is also greater than that of visible light. The high frequency of x-rays allows them to penetrate skin, but they are absorbed by bone, which allows an image of the bone to be produced.
7.5 moles of nitrogen gas (N2) is formed in the following reaction. How many grams
of Ammonia (NH3) are formed?
3H2 + N2 + 2NH
Answer:
Mass = 255 g
Explanation:
Given data:
Number of moles of nitrogen = 7.5 mol
Mass of ammonia formed = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
7.5 : 2/1×7.5 = 15
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 15 mol × 17 g/mol
Mass = 255 g
What is the mass number of atom with 7neutron and 7 proton number
Howmuch woodwouldawoodchuckchuckifawoodchuckcouldchuckwoodwoodchuckcouldchuckwoodwoodchuck
Answer:
7 bcs atomic number of atom is its number of proton.
hope it helps.
What is chyme? It’s a brain-pop question
Answer:
the pulpy acidic fluid which passes from the stomach to the small intestine, consisting of gastric juices and partly digested food.
3. How many moles of HCl are present in 3.70 L of a 2.33 M HCl solution?
a. 0.63 mol
c. 1.58 mol
b. 0.28 mol
d. 8.6 mol
Answer:
8.6 mol
Explanation:
number of moles = molar concentration x volume in litre
number of moles = 2.33 M x 3.70 L = 8.6 mol
Which element easily gains one electron to form a negative ion?
A. Magnesium (Mg)
B. Fluorine (F)
C. Lithium (Li)
D. Nitrogen (N)
Answer:
B. Fluorine (F) element easily gains one electron to for a negative ion.
Which condition leads to a slower rate of weathering?
O porous rocks
O cold climates
O hard minerals
O high temperatures
Answer
Cold Climates
Explanation:
It can go slow
(GIVING BRAINLIEST)Match each of the substances below to the the intermolecular force that are present in the substance.
A.) dispersion forces 1.)CBr2Cl2
B.) dipole dipole Force. 2.)NaCl & H2O
C.) hydrogen bonding. 3.)NH3
D.) Ion Dipole Force. 4.)CH4
Answer:
A4
B1
C3
D2
Explanation:
A4: dispersion forces occur in everything as it is variations in the electron cloud. They are very weak and are the only intermolecular force in a non-polar molecule such as CH4.
B1: Dipole Dipole forces occur between polar molecules. The polarity of the molecule creates a dipole which can attract each other. they are stronger then dispersion forces. CBr2Cl2 is a polar molecule.
C3: hydrogen bonding is a special type of dipole-dipole force and are pretty strong. They can only occur between H-N, H-O, and H-F bonds. NH3 has N-H bonds.
D2: ion dipole forces occur between a polar molecule and ions. They mainly occur when charged species (ions) are in a polar solvent but there are likely less common examples.
I hope this helps. Let me know if anything is unclear.
Energy that is associated with the relative positions of electrons and nuclei in atoms and molecules is called
Answer:
chemical energy
Explanation:
chemical energy is potential energy
The energy associated with the relative positions of electrons and nuclei in atoms and molecules is called thermal energy.
Generally, the energy possessed by an object due to its position is known as potential energy of the object while the energy possessed by an object due to its motion is called kinetic energy.
However, thermal energy describes the energy that is associated with the relative positions of electrons and nuclei in atoms and molecules.
Thus, we can conclude that the energy associated with the relative positions of electrons and nuclei in atoms and molecules is called thermal energy.
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Which describes a difference between cephalopods and gastropods?
Cephalopods have a water vascular system, and gastropods have an open circulatory system.
Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks. CAN SOMEONE PLZZZZ ANWER THIS I WILL GIVE U 15 PIONTS
Answer:
B
Explanation:
I took the test
Answer:
The correct answer is B
Explanation:
A cylinder is filled with 10.0 L of gas and a piston is put into it. The initial pressure of the gas is measured to be 90.1 kPa .The piston is now pulled up, expanding the gas, until the gas has a final volume of 49.0 L. Calculate the final pressure of the gas. Round your answer to 3 significant digits.
Answer:
18.4 kPa
Explanation:
Step 1: Given data
Initial volume of the cylinder (V₁): 10.0 LInitial pressure of the gas (P₁): 90.1 kPaFinal volume of the cylinder (V₂): 49.0 LFinal pressure of the gas (P₂): ?Step 2: Calculate the final pressure of the gas
If we assume the gas behaves as an ideal gas, we can calculate its final volume using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 90.1 kPa × 10.0 L/49.0 L
P₂ = 18.4 kPa
A salt contains only magnesium and one of the halide ions. A 0.0776-g sample of the salt was dissolved in water, and an excess of sulfuric acid was added to form magnesium sulfate (MgSO4), which was filtered, dried, and weighed. Its mass was found to be 0.150 g. What is the formula of the magnesium halide
Answer:
The formula of the magnesium halide is MgF₂
Explanation:
All halides, X, produce a salt with Mg with the formula:
MgX₂
-There are 2 moles of the halide ion per mole of Mg-
With the mass of the MgSO₄ we can find moles of magnesium sulfate = Moles Mg.
With moles of Mg we can know the moles of the halide -1 mole Mg = 2 moles of Halide-
And we can find the mass of Mg in the 0.0776g sample. Subtracting we can find the mass of the halide and, with the mass and moles of the halide we can find its molecular weight and its identity:
Moles MgSO₄ -Molar mass: 120.366g/mol- = Moles Mg:
0.150g * (1mol / 120.366g) = 1.2462x10⁻³ moles Mg
Moles halide:
1.2462x10⁻³ moles Mg * 2 = 2.4924x10⁻³ moles Halide
Mass Mg -Molar mass: 24.305g/mol:
1.2462x10⁻³ moles Mg * (24.305g / mol) = 0.0303g Mg
Mass halide:
0.0776g - 0.0303g Mg = 0.0473g
Molecular weight of the halide:
0.0473g / 2.4924x10⁻³ moles =
18.98g/mol
This molecular weight is the molecular weight of Fluoride ion, F⁻,
The formula of the magnesium halide is MgF₂What happens to the potential energy of an object when it falling from a high place?
Answer:
The higher up an object is the greater its gravitational potential energy. ... As most of this GPE gets changed into kinetic energy, the higher up the object starts from the faster it will be falling when it hits the ground. So a change in gravitational potential energy depends on the height an object moves through.
A 0.0300 mol sample of NO2(g) is placed in a rigid 1.00 L reaction vessel and allowed to reach equilibrium at a certain temperature. What is the value of Kc at this temperature if 0.00500 mol of N2O4(g) is present at equilibrium
Answer:
12.5
Explanation:
Step 1: Write the balanced equation
2 NO₂(g) ⇄ N₂O₄(g)
Since the reaction takes place in a 1.00 L vessel, the initial concentration of NO₂ is 0.0300 M and the concentration at equilibrium of N₂O₄ is 0.00500 M.
Step 2: Make an ICE chart
2 NO₂(g) ⇄ N₂O₄(g)
I 0.0300 0
C -2x +x
E 0.0300-2x x
Step 3: Find the value of x
Since [N₂O₄]eq = 0.00500 M, x = 0.00500
Step 4: Calculate the concentrations at equilibrium
[NO₂] = 0.0300-2(0.00500) = 0.0200 M
[N₂O₄] = 0.00500 M
Step 5: Calculate the concentration equilibrium constant (Kc)
Kc = [N₂O₄]/[NO₂]²
Kc = 0.00500/0.0200²
Kc = 12.5
You add 9.3 g of iron to 28.60 mL of water and observe that the volume of iron and water together is 29.78 mL . Calculate the density of iron.
Express your answer to two significant figures with the appropriate units.
Answer:
density = mass / volume
mass of iron = 9.3g
volume of iron = 29.78ml - 28.00ml = 1.78 ml
density of iron = 9.3 / 1.78 = 5.22471910112 = 5.0
Explanation:
The height of three peaks; A, B, and C obtained in a gas chromatogram are 25.1 mm, 14.5 mm and 37.1 mm. The width of the peaks, at half height, are 4.6 mm, 4.4 mm and 5.9 mm, respectively. Calculate the percentage composition of A in the sample.
Answer: Percentage Compositon Of A in the sample= 28.99%
Explanation:
First we calculate the Peak area.
Because each peak is consdered like a triangle in a Chromatogram, The Area of the peak is calculated as = height x half height of the width
Area of Pea A= 25.1 mm X 4.6mm=115.46mm2
Area of Peak B= 14.5mm x 4.4mm=63.8mm2
Area of PeaK C= 37.1mm x5.9mm =218.89mm2
Total Peak Area= 398.15mm2
Percentage Area of Peak A = Area of Peak A/Total Peak Area x 100
= 115.46 / 398.15 x 100
=0.2899 x 100
=28.99%
Percentage Compositon Of A = 28.99%
Consider the generic Lewis dot symbol for an element. An atom X with three valence electrons. Which element could this symbol represent?
The image having the complete question is attached to this answer.
Answer:
Ga
Explanation:
In order to answer this question well, we must have a good enough knowledge of the periodic table.
We know that the elements in group 3A or group 13 of the periodic table have three valence electrons in their outermost shell.
We just have to look out among the options to notice if there is any member of group 3A or 13.
Gallium is a member of this group. Hence the answer above.
1
Which organelle is the site of photosynthesis? *
(15 Points)
A. chloroplast
B. mitochondrion
C. nucleus
O
D. ribosome
Answer:
A. Chloroplast
Explanation:
What is the energy of the absorbed photon?
Answer:
When it is absorbed, it is converted into heat energy, and the object heats up.
Explanation:
When the photon is absorbed, it is released as heat energy.
What describes the relationship between elements and compounds?
Group of answer choices
A. Carbon changes to Oxygen to form a compound
B.A few elements can combine to form a compound
C. Carbon is always a part of a compound
D. A few compounds combine to form an element
Answer:
B. A few elements can combine to form a compound
Explanation:
An element is a substance that cannot be chemically broken down into simpler substances. (THESE ARE IN THE PERIODIC TABLE OF THE ELEMENTS)A compound is a substance composed of two or more elements in fixed, definite proportions.Source: Tro Nivaldo J.. Principles of Chemistry (p. G-4). Pearson Education. Kindle Edition.
Answer:
.A few elements can combine to form a compound
Explanation:
Why are stomates important for gas exchange and photosynthesis?
The value of A for an atom containing 12 protons, 12 electrons and 16 neutrons is
a. 24
b.4
C. 28
d. 12
e. 16
Answer: A = atomic number = 12
Explanation: A (atomic number) defines the chemical element. It is the numbervof protons or electrons. Neutron numbers may vary, produving isotopes of differing atomic mass. This isotope has atomic mass 28. The atomic number 12 = carbon. C28 does not really exist. If it could be produced it would be radioactive with an almost zero halflife.
Clouds are formed from which of the following processes:
A.evaporation
B.condensation
C.precipitation
Answer: Condensation
Explanation: Condensation forms clouds when water vapor in the air cools down into water and crystals.
The liquid 1-decanethiol is insoluble in water. If approximately equal volumes of water and 1-decanethiol were mixed in a separatory funnel, would the water layer end up on the top or on the bottom
Answer:
1-decanethiol on top layer and water on the bottom layer.
Explanation:
Hello!
In this case, since long-chained alcohols have a predominant nonpolar section in the molecule, we understand they are largely insoluble in water, also because their densities tend to be less than that of the water, which means they act as a light phase and water the heavy phase.
In such a way, when mixing equal volumes of 1-decanethiol and water in a separatory funnel, a phase splitting is evidenced and the alcohol remains on the top layer because of its lower density.
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What do we call the force produced by the interaction of electricity and magnets?
A. Electricity
B. Electromagnetism
C. Gravity
D. Magnetism
Hurry!
7. Sodium chloride is produced from its elements through a synthesis reaction. What mass of each reactant would be required to produce 25.0 mol of sodium chloride?
Na + Cl2 → NaCl.
Answer:
Mass of Cl₂ = 887.5 g
Mass of Na = 575 g
Explanation:
Given data;
Number of moles of sodium chloride produced = 25.0 mol
Mass of Na required = ?
Mass of Cl₂ required = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
now we will compare the moles of sodium chloride with both reactant.
NaCl : Na
2 : 2
25.0 : 25.0
NaCl : Cl₂
2 : 1
25.0 : 1/2 ×25.0 = 12.5 mol
Mass of Na:
Mass = number of moles × molar mass
Mass = 25.0 mol × 23 g/mol
Mass = 575 g
Mass of Cl₂:
Mass = number of moles × molar mass
Mass = 12.5 mol × 71 g/mol
Mass = 887.5 g
would the ph shift observed with the buffer hace been greater less or the same if 0.4 M buffer had been used instead of 0.2
Answer:
It will remain the same.
Explanation:
A buffer solution is a kind of solution that has resistance for changes in the pH of a solution. It is a solution of weak acid and conjugate base or it may be otherwise.
H^+ + A^- <====================> HA.
Buffer solution aids in stabilizing pH and an example of a buffer solution is the human blood.
The higher the concentration, the lower the ka and vice versa. Thus, when 0.4M is being used instead of 0.2M the pH will be the same because when dealing with buffer solution, it is all about the value of (salt) / (acid) rather than on the molarity of one specie alone.
