Answer:
78.8 mL .
Explanation:
Ba( NO₃ )₂ ⇄ Ba⁺² + 2 NO₃⁻
1 mole 2 mole
261 mL of .272 M in nitrate contains .261 x .272 gram -ions ( moles ) of NO₃⁻
= .071 gram-ions .
Let the volume of Ba(NO₃)₂ required be v litre .
moles of Ba( NO₃ )₂ in v volume = v x .45 moles
v x .45 moles of Ba( NO₃ )₂ will give 2 x v x .45 moles of NO₃⁻
According to question
2 x v x .45 = .071
v = .07888 litre
= 78.8 mL .
(GIVING BRAINLIEST)Match the type of chemical bond with the best description:
A.) ionic bonding
B.) covalent bonding
C.) metallic bonding
-------------------------------------------
1.)sea of electrons surrounding metal cations
2.) sharing of electrons between nonmetal atoms
3.) transfer of electrons from cation to anion
Answer:
A and 3
B and 2
C and 1
Explanation:
Ionic bonding is the transfer of electrons from a cation to an anion.
Covalent bonding is the sharing of electrons between nonmetal atoms.
Metallic bonding is the sea of electrons metal cations.
Hope this helped!
When methane is combusted in the presence of oxygen, water and
carbon dioxide are produced. State a practical use foe this reaction.
Calculate the numder of moles of 7.89X 10^11 atoms of Carbon.
Answer:
The numder of moles of 7.89*10¹¹ atoms of Carbon is 1.31*10⁻¹².
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.
Then you can apply the following rule of three, if by definition of Avogadro's number 6.023*10²³ atoms are present in 1 mole of Carbon, 7.89*10¹¹ atoms will be present in how many moles?
[tex]amount of moles=\frac{1 mole*7.89*10^{11} }{6.023*10^{23} }[/tex]
amount of moles=1.31*10⁻¹²
The numder of moles of 7.89*10¹¹ atoms of Carbon is 1.31*10⁻¹².
Question 10 of 10
Choose the option which best answers the
question.
Which of the following is not equivalent to
one drink?
a. 12 oz. of beer
b. 5 oz. of wine
c. 4 oz. of 40-proof liquor
d. 1 1/2 oz. of 80-proof liquor
Answer:
d 1 1/2 oz.. of 80-proof liquor
1 1/2 oz. of 80-proof liquor is not equivalent to one drink. Hence, option D is correct.
What is oz?Oz is an abbreviation for ounce. An ounce is equal to 1/16 pound (437 1/2 grains) and equal to 480 grains, or 1/12 pound.
1 1/2 oz. of 80-proof liquor is not equivalent to one drink.
Hence, option D is correct.
Learn more about oz here:
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Heres our final question.
1. Are all forms of conflict harmful to the organization? Why do you think so?
Answer:
Not all conflicts are harmful to an organization
Explanation:
Not all conflicts in an organization are harmful to that organization.
Conflicts can be good for an organization. Even though conflicts may always seem difficult, they could bring about growth and changes which are good for all organizations.
Conflict may have positive or negative results when they occur. How these conflicts are approached is what determines the result.
Positive conflict can be constructive, it births new ideas, gives opportunities for creativity and skills expansion and can solve continuous problems.
When testing a hypothesis, what type of data can be taken?
Answer:
visual ob
Explanation:
Answer:
all of the above
because these use all of your 5 senses
The liquid soaking the dollar bill is a mix of alcohol and water. As the alcohol burns, the water evaporates. Why doesn't the heat from the burning alcohol cause the bill itself to char or burn
Answer:
Because heat causes alcohol to volatilize, instead of burning it.
The combustion is not fulfilled since this is detached from the surface of the banknote that would be the necessary product to burn, in addition to considering that the necessary temperature is not reached
Explanation:
When water and alcohol are joined, they form a solution with high evaporation power, plus alcohol that has a higher degree of volatility than water, this is how these liquids are not retained on the surface of the banknote with heat and they are not it burns.
5.5x10² – 6.50x10'
Express the calculation in correct significant digits
Answer:
[tex]6.15x10^2[/tex]
Explanation:
Hello!
In this case, when performing mathematical operations with numbers in scientific notation, the first step is to write them in standard notation:
550 - 65.0
Thus, the result without any significant figures-based analysis is:
615.0
However, since 550 is significant to the ones and 65.0 to the tenths, we need to round the result to the bigger significance, in this case to the ones; therefore the appropriate result would be:
615
That in scientific notation would be:
[tex]6.15x10^2[/tex]
Best regards!
Calculate the mass of water produced when 1.43 g of butane reacts with excess oxygen. Express your answer to three significant figures and include the appropriate units. g
Answer:
[tex]m_{H_2O}=2.22gH_2O[/tex]
Explanation:
Hello!
In this case, since the combustion of butane is:
[tex]C_4H_{10}+\frac{13}{2} O_2\rightarrow 4CO_2+5H_2O[/tex]
As there is an excess of oxygen, we can compute the mass of water by simply using the molar masses of butane and water and the 1:5 mole ratio between them as shown below:
[tex]m_{H_2O}=1.43gC_4H_{10}*\frac{1molC_4H_{10}}{58.14gC_4H_{10}} *\frac{5molH_2O}{1molC_4H_{10}} *\frac{18.02gH_2O}{1molH_2O} \\\\m_{H_2O}=2.22gH_2O[/tex]
Best regards!
If you had a cup full of methanol and a pool full of methanol do you think they would have the same density or different density?
Answer:
same density
Explanation:
The amount of methanol is a quantitative characteristic, and by the other side the density of methanol is a qualitative characteristic. What I mean is that the amount of methanol is not related to the density; it would be the same density no matter how much methanol you have.
Substance C has stronger attraction between molecules than substance D. If substances C and D are both in the gas phase and are at the same energy level, which of the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance C or Substance D?
Answer:
Substance D would be the correct answer.
A chart with the densities of several substances is provided. A sample substance has a volume of 26cm3 and a mass of 205.4g. Which metal is it? D=M/V
Group of answer choices
Tin
Lead
Aluminum
Iron
Answer:
I think that it might be C. I'm not an expert so please don't blame me, I'm sorry if i'm wrong!
Explanation:
Calculate the mole fraction of Ba Cl 2 in an aqueous solution prepared by dissolving 0.400 moles of Ba Cl 2 in 850.0 g of water.
Answer:
0.0084
Explanation:
The mole fraction of BaCl₂ (X) is calculated as follows:
X = moles BaCl₂/total moles of solution
Given:
moles of BaCl₂ = 0.400 moles
mass of water = 850.0 g
We have to convert the mass of water to moles, by using the molecular weight of water (Mw):
Mw of water (H₂O) = (2 x 1 g/mol)+ 16 g/mol = 18 g/mol
moles of water = mass of water/Mw of water = 850.0 g/(18 g/mol) = 47.2 mol
The total moles of the solution is given by the addition of the moles of solute (BaCl₂) and the moles of solvent (water):
total moles of solution = moles of BaCl₂ + moles of water = 0.400 + 47.2 mol = 47.6 mol
Finally, we calculate the mole fraction:
X = 0.400 mol/47.6 mol = 0.0084
Can someone help me with this question?
Answer:
I think the answer is h
Explanation:
when you let the balloon go, all the air the is inside comes out causing it to move forard
Which of the following is true about properties of covalent/ molecular bonds?
Are formed between metals only
Weak bonds
Are formed between metals and non-metals
Strong bonds
Answer:There are two types of atomic bonds - ionic bonds and covalent bonds. They differ in their structure and properties. Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation. Relatively high energies are required to break them (50 - 200 kcal/mol). Whether two atoms can form a covalent bond depends upon their electronegativity i.e. the power of an atom in a molecule to attract electrons to itself. If two atoms differ considerably in their electronegativity - as sodium and chloride do - then one of the atoms will lose its electron to the other atom. This results in a positively charged ion (cation) and negatively charged ion (anion). The bond between these two ions is called an ionic bond.
Which of the following are components of the anterior (ventralo body cavity?
-thoracic cavity
-vertebral cavity
-pleural cavity
-cranial cavity
Answer:
thoracic cavity
Explanation:
The ventral body cavity in human body is the front aspect of the human body. Ventral body cavity is combined with the combination of three components that include the thoracic cavity, the pelvic cavity and the abdominal cavity.
So, Thoracic cavity is the components of the anterior cavity that refers to the the ventral internal organs above the diaphragm.
Hence, the correct answer is "thoracic cavity".
Which change happens during evaporation?
A. A gas turns into a liquid.
B. A liquid turns into a gas.
C. A solid turns into a liquid.
D. A liquid turns into a solid.
Answer:
B.) A Liquid turns into Gas.
When a substance is heated, the molecules move faster.
True or false
I think this statement is True.
Oxygen forms a number of compounds with nitrogen, many of which are quite reactive. One such compound is 36.86 % by mass N . Calculate the number of grams of oxygen present in a sample of this compound that contains 44.00 grams of N .
Answer:
75.37 g
Explanation:
From the question given above, the following data were obtained:
Percentage of nitrogen (N) in the compound = 36.86 %
Mass of nitrogen (N) in the compound = 44 g
Mass of oxygen (O) in the compound =?
Next, we shall determine the total mass of the compound. This can be obtained as follow:
Percentage of nitrogen (N) in the compound = 36.86 %
Mass of nitrogen (N) in the compound = 44 g
Total mass of compound (T) =?
Percentage of N = mass of N/ total mass × 100
36.86 % = 44 / T
36.86 / 100 = 44 / T
Cross multiply
36.86 × T = 100 × 44
36.86 × T = 4400
Divide both side by 36.86
T = 4400 / 36.86
Total mass = 119.37 g
Next, we shall determine the percentage of oxygen in the compound. This can be obtained as follow:
Percentage of N = 36.86 %
Percentage of O =?
Percentage of O = 100 – 36.86 %
Percentage of O = 63.14 %
Finally, we shall determine the mass of oxygen in the compound. This can be obtained as follow:
Percentage of O = 63.14 %
Total mass = 119.37 g
Mass of O =.?
Percentage of O = mass of O / total mass × 100
63.14 % = Mass of O / 119.37
Cross multiply
Mass of O = 63.14 % × 119.37
Mass of O = (63.14 / 100)× 119.37
Mass of O = 75.37 g
Thus, the mass of oxygen in the compound is 75.37 g
At midnight in the dark of the night, what is most likely happening in a leaf? * O Respiration O Photosynthesis O Both photosynthesis and respiration Neither photosynthesis or respiration
Please help thanks!
Answer: Photosynthesis
Explanation:
Answer:2
Explanationb
Annie learns that the compound sulfuric acid is called the universal chemical. The acid is used in everything from gasoline to paper. Annie uses beads in three different colors to model sulfuric acid. Based on the model, what is the chemical formula of sulfuric acid?
A.
S2HO4
B.
O2H4S
C.
S4O2H
D.
H2SO4
Answer:
D. H2SO4
Explanation:
The chemical formula of a compound is an expression that stares out the elements (in form of symbols)present in a compound and the number of the atoms.
In the image;
There is one sulphur (S) atom, 4 oxygen(O) atoms and 2 hydrogen (H) atoms
The chemical formula is;
H2SO4.
The correct option is option D.
A chemist measures the amount of fluorine gas produced during an experiment. He finds that of fluorine gas is produced. Calculate the number of moles of fluorine gas produced.
Answer:
12.7 mol
Explanation:
A chemist measures the amount of fluorine gas produced during an experiment. He finds that 482. g of fluorine gas is produced. Calculate the number of moles of fluorine gas produced.
Step 1: Given data
Mass of fluorine (m): 482. g
Step 2: Determine the molar mass (M) of fluorine
Fluorine is a diatomic molecule of chemical formula F₂. Its molar mass is:
mF₂ = 2 × mF = 2 × 19.00 g/mol = 38.00 g/mol
Step 3: Determine the number of moles (n) corresponding to 482. g of fluorine
We will use the following expression,.
n = m/M
n = 482. g/(38.00 g/mol)
n = 12.7 mol
How many moles are in 123.0 grams of KClO4? (3 points)
0.2354 mol KClO4
0.6445 mol KClO4
0.7124 mol KClO4
0.8878 mol KClO4
Answer:
0.8878 mol KClO4
Explanation:
Molar mass of KClO4 = 39.0983 + 35.453 + ( 15.9994 x 4 ) = 39.0983 + 35.453 + 63.9976 = 138.5489g/mol
but,
number of moles = mass in grams / molar mass where mass in grams = 123g, molar mass = 138.5489g/mol
number of moles = 123g / 138.5489g/mol = 0.8878mol
Therefore the number of moles present in 123 g of [tex] KClO_4[/tex] is 0.888 moles.
Given,
The weight of the [tex] KClO_4[/tex] is 123. grams
molecular weight of [tex] KClO_4[/tex] is [tex]39+35.5+16\times4=138.5 g[/tex]
138.5 g of [tex]KclO_4[/tex] is equal to one mole
Gram molecular wt. of a substance is equal to one mole
No. of moles = [tex]\frac{Wt}{GMW} [/tex]
123 g of [tex]KClO_4[/tex] is equal to [tex]\frac{123}{138.5}=0.888 moles [/tex]
Learn More:https://brainly.com/question/2416206
If 63.4 J of heat are added to a sample
of aluminum with a mass of 16.33 g, what is
its temperature change? The specific heat of
aluminum is 0.899 J/g °C
Answer:
dt = 4.32°C
Explanation:
Given the following data;
Mass = 16.33g
Quantity of heat, Q = 63.4J
Specific heat capacity = 0.899 J/g °C
To find the temperature change;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat. m represents the mass of an object. c represents the specific heat capacity of water. dt represents the change in temperature.Making dt the subject of formula;
[tex] dt = \frac {Q}{mc} [/tex]
Substituting into the equation, we have;
[tex] dt = \frac {63.4}{16.33*0.899} [/tex]
[tex] dt = \frac {63.4}{14.6807} [/tex]
dt = 4.32°C
Therefore, the change in temperature for this aluminum is equal to 4.32°C.
At what temperature does iron turn into a gas? What does this tell you about the attraction between iron’s particles?
Answer: In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. The actual average speed of the particles depends on their mass as well as the temperature – heavier particles move more slowly than lighter ones at the same temperature. The oxygen and nitrogen molecules in air at normal room temperature are moving rapidly at between 300 to 400 metres per second. Unlike collisions between macroscopic objects, collisions between particles are perfectly elastic with no loss of kinetic energy.
Explanation: This is very different to most other collisions where some kinetic energy is transformed into other forms such as heat and sound. It is the perfectly elastic nature of the collisions that enables the gas particles to continue rebounding after each collision with no loss of speed. Particles are still subject to gravity and hit the bottom of a container with greater force than the top, and giving gases weight. Hope this helps with your problem! Byeeee :DDD
It's sad seeing people actually helping you lol.
and then you dont give brainliest. like ever.
Suppose a student conducted the synthesis of an alkyl ether and obtained 270 mg of the crude product. The student then used water/ethanol to recrystallize the product. After recrystallization, the mass of the alkyl ether product was 280 mg. What would be a possible explanation for the problem and what would be your suggestion to the student
Answer:
The alkyl ether was yet to be totally dried off after the student recrystallize it .
The suggestion to the student is to redry the alkyl ether product and then reweigh
Explanation:
Based on the information the likely explanation for the problem that arise is that the alkyl ether was not totally dried after the student recrystallize the product which lead to the increase in mass from 270mg to 280mg gaining extra mass of 10mg (270mg -280mg).
Therefore what would be my suggestion to the student is that they should redry the alkyl ether product again and make sure that the water is totally dried off and then reweigh or weigh the product again for the second time .
A 0.67 gram sample of chromium is reacted with sulfur. The resulting chromium sulfide has a mass of 1.2888 grams. What is the empirical formula
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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Which chemical equation represents a redox reaction
Answer:
The correct answer is option B, that is, CO + H2O → H2 + CO2
The redox reactions are regarded as the chemical reactions in which one reactant goes through the process of reduction and one reactant goes through the process of oxidation. The reduction reactions are the reactions in which gain of electrons occurs, while oxidation reactions are the reactions in which loss of electrons occurs.
From the mentioned options, only option B, that is, CO + H2O → H2 + CO2 is a kind of redox reaction. In this, the carbon is getting oxidized from +2 to +4 oxidation state, and hydrogen is getting reduced from +1 to 0 oxidation state. Hence, this reaction can be regarded as a redox reaction.
Explanation:
Iron oxide is combined with carbon monoxide to produce pure iron and carbon dioxide gas. Physical or Chemical Change? Why?
Answer:
Chemical because it alters the identity of the substance
Calculate the gravitational force of attraction between a 26kg boy and his 5.1kg dog when they are separated by 0.19m
Answer:
Gravitational force of attraction G(f) = 2.44 x 10⁻⁷ (approx.)
Explanation:
Given:
Mass M1 = 26 kg
Mass M2 = 5.1 kg
Distance r = 0.19 m
Find:
Gravitational force of attraction G(f)
Computation:
Gravitational force of attraction G(f) = G(m1)(m2)/r²
Gravitational force of attraction G(f) = [6.67 x 10⁻¹¹](26)(5.1)/(0.19)²
Gravitational force of attraction G(f) = 8.84 x 10⁻⁹ / 0.0361
Gravitational force of attraction G(f) = 2.44 x 10⁻⁷ (approx.)
