Answer:
Antimony
Explanation:
Protons-51
Neutrons-71
Electrons-51
Calculate the molarity of a solution containing 0.875moles of glucose in 1.5kg of water.
molarity = moles of solute/liters of solution
We know the moles of solute: 0.875 moles of glucose. We can easily determine the liters of solution by using the mass of water given (1.5 kg) and the density of water (approximately 1 kg/L): they're, for all intents and purposes, equal (the approximation isn't large enough to be appreciable here, nor would the volume of the solution appreciably change since the solute is a solid that will dissolve into the solvent). So, we have 1.5 L of solution.
Now, we plug in what we have:
molarity = 0.875 moles of glucose/1.5 L of solution = 0.58 M glucose
The answer is provided to two significant figures since we're given the mass of water to two significant figures.
Given the setup of the equilibrium constant expression, a reaction that has a high equilibrium constant will "favor" the products
True
False
Answer:
for points
Explanation:
loll
A student has synthesized a new compound (compound A, a nonelectrolyte). She uses osmotic pressure to determine the molar mass of compound A. She dissolves 0.50 g of compound A in water and prepares 15 mL of solution. At 25 C the osmotic pressure is 7.38 atm. Calculate the molar mass (g/mole) of compound A. Do not include a unit with your answer.
Answer:
110g/mol is the molar mass of compound A
Explanation:
The osmotic pressure of a solution could be obtained using the equation:
π = i*M*R*T -Solving molarity we can find the molar mass of the solute A-
Where π is osmotic pressure (7.38atm)
i is Van't Hoff's factor (1 for nonelectrolytes)
M is molarity (Our incognite)
R is gas constant (0.082atmL/molK)
T is absolute temperature (25°C + 273.15 = 298.15K)
Computing the values:
7.378atm = 1*M*0.082atmL/molK*298.15K
0.3018 mol/L is the concentration of the solution.
The volume of the solution is 15mL = 0.015L. Moles of the solute are:
0.3018 mol/L * 0.015L = 4.527x10⁻³ moles
Molar mass is the ratio between mass of the compound (0.50g) and the moles (4.527x10⁻³ moles). That is:
0.50g / 4.527x10⁻³ moles =
110g/mol is the molar mass of compound ADecide whether the element is a metal or nonmetal, if you can.
Element is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. But the LED stays dark
Answer:
The element is a nonmetal
Explanation:
Elements are broadly classified into metals and non metals. Metals conduct electricity while non metals do not conduct electricity.
If we look at this scenario described in the question, we can easily decipher that the element is a nonmetal because the LED stays dark. The LED should have been lit if electricity was passed through the element in question.
Hence, the element is a non metal.
Which of the following statements is false?
a. This class discussed four physical states of matter
b. An atom is the smallest particle of an element that still contains properties of the original element.
c. Gases can be colorless or colored
d. Mass is the measure of the earth’s gravitational attraction of a body
e. A pure substance has a fixed composition.
Answer:
d. Mass is the measure of the earth’s gravitational attraction of a body
This is FALSE. Mass is the measure of matter than an object contains.
Explanation:
b. An atom is the smallest particle of an element that still contains properties of the original element.
This is True
c. Gases can be colorless or colored
This is True
d. Mass is the measure of the earth’s gravitational attraction of a body
This is FALSE. Mass is the measure of matter than an object contains.
e. A pure substance has a fixed composition.
This is True.
atoms are composed of subtomatic particles called
Which of the following compounds is formed by a covalent bond?
a. C6H12O6 b. NaBr c. CaCI2 d. NaCI
Answer: C6H12O6 is formed by a covalent bond, the rest of the options are formed by ionic bonds.
Nitrates are _____.
compounds made from carbon dioxide
used by plants to make protein
released into the atmosphere by respiration
are harmful to the environment
Answer:
used by plants to make protein
Explanation:
so B
What is the percent composition of Mg in the compound Mg3(PO4)2?
A 21.92%
B 23.57%
C 32.32%
D 27.74%
Answer:
D 27.74%
Explanation:
Percent composition of Magnesium (Mg) in Magnesium Phosphate compound ie Mg3(PO4)2 = 27.74%
Answer:
The answer is D
Explanation:
I took the test
What type of reaction is _CaCO3 and H2
Decomposition: A substance breaks down to smaller species.
Which of the following is formed when an acid reacts with a base? (1 point)
Alkaline
Hydrogen ion
Hydroxide ion
Salt
Answer:
Probably Alkaline
Explanation:
Not sure at all.
how likely is it that a brother or sister would be just like you.
Answer:
Theoretically you could be totally unrelated to your sister or share the exact same DNA as your brother. But because we are talking about so much DNA and so many different possible combinations, the percentage usually comes out to about 50%. Think about it like flipping a coin.
Explanation:
Explanation:
Theoretically you could be totally unrelated to your sister or share the exact same DNA as your brother. But because we are talking about so much DNA and so many different possible combinations, the percentage usually comes out to about 50%.
The bond angle for methane is the angle determined by two consecutive hydrogen atoms and the central carbon atom.
a. True
b. False
Answer:
a. True
Explanation:
The bond angle for methane is the angle determined by two consecutive hydrogen atoms and the central carbon atom.
Methane, a tetrahedron has the structural formula:
H
|
H - C - H
|
H Methane, CH4
The bond angle is the angle between the H-C-H atoms and is 109.5degrees.
1. How many moles are in 230. Grams of SO2?
2. How many molecules are in 30.5 moles of lithium nitrate?
3.59 mol
1.836 x 10 ²⁵ molecules
Further explanationGiven
230 g SO2
30.5 moles LiNO3
Required
moles and molecules
Solution
mol = mass : molar mass
1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)
1. 230 g x 1 mol/64,066 g =3.59 mol
2. 30.5 moles x 6.02 x 10 ²³ molecules / 1 mol = 1.836 x 10 ²⁵ molecules
The equilibrium constant, Kc, for the following reaction is 83.3 at 500 K. PCl3(g) Cl2(g) PCl5(g) Calculate the equilibrium concentrations of reactant and products when 0.453 moles of PCl3 and 0.453 moles of Cl2 are introduced into a 1.00 L vessel at 500 K.
Answer:
[tex][PCl_3]=[Cl_2]=0.068M[/tex]
[tex][PCl_5]=0.385M[/tex]
Explanation:
Hello!
In this case, since the equilibrium expression for the considered equation is:
[tex]Kc=\frac{[PCl_5]}{[Cl_2][PCl_3]}[/tex]
Which can be written in terms of the reaction extent and the ICE chart and the initial concentrations of 0.453 M as shown below:
[tex]83.3=\frac{x}{(0.453M-x)(0.453M-x)}[/tex]
We can solve for x as follows:
[tex]x=0.385M[/tex]
In such a way, we obtain the following concentrations at equilibrium:
[tex][PCl_3]=[Cl_2]=0.453M-0.385M=0.068M[/tex]
[tex][PCl_5]=0.385M[/tex]
Best regards!
Which natural resource is limited in supply?
)
A)
wind
B)
petroleum
C)
water power
D)
solar energy
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.7 nm.93.7 nm. What is the final state of the hydrogen atom? Values for physical constants can be found in the Chempendix.
Answer:
5
Explanation:
Given that the formula is;
1/λ= R(1/nf^2 - 1/ni^2)
λ = 93.7 nm or 93.7 * 10^-9 m
R= 1.097 * 10^7 m-1
nf = ?
ni = 1
From;
ΔE = hc/λ
ΔE = 6.63 * 10^-34 * 3* 10^8/93.7 * 10^-9
ΔE = 21 * 10^-19 J
ΔE = -2.18 * 10^-18 J (1/nf^2 - 1/ni^2)
21 * 10^-19 J = -2.18 * 10^-18 J (1/nf^2 - 1/ni^2)
21 * 10^-19/-2.18 * 10^-18 = (1/nf^2 - 1/1^2)
-0.963 = (1/nf^2 - 1)
-0.963 + 1 = 1/nf^2
0.037 = 1/nf^2
nf^2 = (0.037)^-1
nf^2 = 27
nf = 5
A student holds their pen 20 centimeters above the desk. If the pen has a mass of 3
grams, how much potential energy does the pen have? (gravity is 9.8 m/s2)
SHOW YOUR WORK.
The potential energy : PE = 5.88 x 10⁻³ J
Further explanationGiven
height = h = 20 cm = 0.2 m
mass = 3 grams = 3 x 10⁻³ kg
Required
The potential energy
Solution
The energy produced from its position is called potential energy (PE)
which can be formulated as:
PE = m. g. h
Input the value :
PE = 3 x 10⁻³ x 9.8 x 0.2
PE = 5.88 x 10⁻³ J
Which of the following intermolecular forces is the strongest?
A. Hydrogen bonding
B. Van der Waals forces
C. Dipole-dipole attractions
D. Induced dipole attractions
SUBMIT
Answer:
A. Hydrogen Bonding
Explanation:
Answer:
Hydrogen bonding
Explanation:
because it has the highest electronegative force
In 7 seconds, how far will a ball roll at a speed of 4 meters/second?
Answer:
28 meters
Explanation:
What are the particles demonstrating in this image?
O electromagnetic field
O magnetic field
O electromagnetic motor
Oelectric field
Answer:
electromagnetic field
The compound dioxane, which is used as a solvent in various industrial processes, is composed of C, H, and O atoms. Combustion of a 2.203-g sample of this compound produces 4.401 g CO2 and 1.802 g H2O. A separate experiment shows that it has a molar mass of 88.1 g/mol. What is the correct molecular formula for dioxane?
Answer:
[tex]C_4H_8O_2[/tex]
Explanation:
Hello!
In this case, since the combustion of this compound has only one source of carbon, the carbon dioxide, we can compute both mass and moles of carbon in 4.401 grams of CO2:
[tex]n_C = 4.401gCO_2*\frac{1molCO_2}{44.01gCO_2}* \frac{1molC}{1molCO_2} =0.1molC\\\\m_C = 0.1molC*\frac{12.01gC}{1molC} = 1.201gC[/tex]
Next, we do the same for hydrogen in water, as the only source of this atom in the products:
[tex]n_H = 1.802gH_2O*\frac{1molH_2O}{18.02gH_2O}* \frac{2molH}{1molH_2O} =0.2molH\\\\m_H = 0.2molC*\frac{1.01gH}{1molH} = 0.202gH[/tex]
Thus, we compute the mass and then the moles of oxygen considering the 2.203-g sample of dioxane:
[tex]m_O = 2.203g-m_C-m_H=2.203g-1.202g-0.202g = 0.799gO\\\\n_O =0.799gO*\frac{1molO}{16.0gO} =0.05molO[/tex]
Next, we divide the moles of C, H and O by the moles of O as the fewest in the molecule to find their subscripts in the empirical formula:
[tex]C:\frac{0.1mol}{0.050mol}=2 \\\\H:\frac{0.202mol}{0.050mol} =4\\\\O:\frac{0.050}{0.050}=1 \\\\[/tex]
[tex]C_2H_4O[/tex]
Whose molar mass is 44.1 g/mol. Thus, since the molar mass of the compound is 88.1 g/mol, we see a factor of 2 by which the empirical formula should be multiplied to get the molecular one, therefore, we obtain:
[tex]C_4H_8O_2[/tex]
Best regards!
100 POINTS!!!!
Sydney made the largest s'more when camping with 70g of marshmallows, 50g of graham cracker and 100g of chocolate. To find the percent composition of the chocolate, which equation would she use?
Question 1 options:
100g/120g*100
100g/220g*100
220g/100g*100
120g/100g*100
100g/220g*100 is the correct answer- I took the test
Answer:
answer:
given;
total gram=70+50+100=220g
total gram of chocolate=100g
percentage composition of chocolate=total gram of chocolate/total gram ×100%
=100g/220g ×100 is your answer
Determine what happens in this reaction.S + Cl2 →SCl2
Sulfur act as a reducing agent and chlorine acts as an oxidizing agent.
Oxidation: The loss of electronsReduction: The gain of electronsOxidation number:The charge is based on the number of electrons assigned to an atom as compared to the neutral atom
Given reaction:-
[tex]S+Cl_2 \rightarrow SCl_2[/tex]
The oxidation state of sulfur in the left side is 0, but in right side is +2. So, sulfur is oxidized. The oxidation number of Cl in the reactant side is 0 and n the product side is -1. So, Cl acts as oxidizing agent.
To know more about:-
brainly.com/question/13182308
A strong acid is used as a titrant against a weak base. What would be the most likely pH for the equilibrium point?
Answer:
Below 7
Explanation:
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of reactants have been mixed(Wikipedia).
For a strong acid-weak base titration, the pH at the equivalence point is usually below 7. This owes to the fact that a conjugate acid is produced in the course of the reaction which interacts with water to produce hydronium (H3O+) ions.
Answer:
7
Explanation:
i did my research and from what i found its 7.
you
12. Choose one famous MLK quote as
Favorite and explain why that is your
favorite?
Since carboxylic acids can form hydrogen bonds to create dimers, they have higher boiling points than alcohols and other carbonyl compounds.
a. True
b. False
Answer:
True
Explanation:
The arrangement of three groups COOH, CO, OH in the order of reducing boiling point is as follow -
COOH > OH > CO
COOH gets strongly polarised due to the presence of electron withdrawing carboxy group and hence have strong H+ bonds as compared to that of alcohol.
Hence the given statement is true.
How many grams is 6.11 moles of MgCO3?
Answer:
the answer is 262.216229
Explanation:
:)
Answer:
84.3139 grams.
Explanation:
Which best describes an element?
a pure substance
a type of a mixture
a pure compound
an impure substance
Answer:
A.) pure substance
Explanation:
edge 2021
Human induced phenomena that cause global
warming
(Need at least 3)
Answer:
Burning of fossil fuels
Cutting of tress
Also CO2 is produce in industries like cement manufacturing.
Explanation: