Calculate the mass of calcium carbide produced if 1770 kJ of heat is absorbed.
Answer:
[tex]m=243.72g[/tex]
Explanation:
Hello,
For the given chemical reaction:
[tex]CaO(s) + 3 C(s) \rightarrow CaC_2(s) + CO(g)[/tex]
Whose heat of reaction is 464.8 kJ/mol which means that energy is absorbed due to the chemical reaction, we can compute the moles of calcium carbide via the following relationship:
[tex]n=\frac{1770kJ}{464.8 kJ/mol}\\ \\n=3.81mol[/tex]
Then, since the molar mass of calcium carbide is 64 g/mol, the yielded mass turns out:
[tex]m=3.81mol*\frac{64g}{1mol}\\ \\m=243.72g[/tex]
Best regards.
Explain how you can tell if something is matter?
Calculate the amount of C in 0.600g of CO2.
Answer: Since one molecule of CO2 contains one molecule carbon atoms, therefore, 0.6 molecule of carbon dioxide will contain 0.6 molecule of carbon.
Mass of C in 0.6 molecule of CO2
Explanation
= No. Of molecule × molar mass
= 0.6× 12gm
=7.2gm
How do sociologists talk about how the individual is related to the larger society?
Answer:
Sociologist view that an individual is a reflection of a society to which he or she have belonged.
Explanation:
It is not an individual or a society, but both of them together allows us to reveal the fundamentals of human existence. The extreme view of the person or society has been discarded for quite some time. The concept of society indicates a reciprocal giving-and-take by the individuals involved in the form of mutual corporations, interaction, or the more subtle types of social interaction such as letter writing, festival greeting, sending and accepting presents, telephone communication, e-mailing, internet chatting, and public relations engagement.
This group on the periodic table contains elements in the gas phase and are considered to be inert.
Answer:
noble gases
Explanation:
Group 8A — The Noble or Inert Gases. Group 8A (or VIIIA) of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The name comes from the fact that these elements are virtually unreactive towards other elements or compounds.
Answer:
noble gases
Explanation:
Gathering 8A — The Noble or Inert Gases. Gathering 8A (or VIIIA) of the intermittent table are the respectable gases or dormant gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The name originates from the way that these components are practically lifeless towards different components or mixes.
According to this food web, which of the following would be considered primary consumer?
A. Grasshoppers
B. Plants
C. Wolves
D. Mushrooms
Answer:
d mushrooms
Explanation:
The arrows on a food web point to where the energy source goes. Although mushrooms are considered decomposers, all the energy ends up at the mushroom and that is what makes a primary consumer the primary consumer no matter what.
ANSWER:
The answer is GRASSHOPPER
EXPLANATION:
Organisms feed on one another to obtain energy needed for metabolic activities. Food web is one of the ways by which the relationship between these organisms that feed on one another is displayed.
Energy flow starts from a PRODUCER, which is the plant in this food web. An organism (usually an herbivore) that feeds on the producer is referred to as PRIMARY CONSUMER. All consumers are incapable of synthesizing their own food, hence, they depend on other organisms. However, primary consumers directly depend on producers.
In the food web attached to this question as an image, the PRIMARY CONSUMER is the GRASSHOPPER because it directly feeds on the PRODUCER (plant).
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Which pair of elements would most likely combine to form a salt?
Na and C
N and F
Cs and I
I and F
Answer:
C
Explanation:
just took the test
The pair of chemical elements which would most likely combine to form a salt is: Cs and I.
An inorganic substance can be defined as a substance that doesn't contain both carbon and hydrogen.
In Chemistry, some examples of an inorganic compound include the following:
Water.Soap.Baking soda.Salt.A salt comprises an ionic assembly of both the negative ion (anion) of an acid and a positive ion (cation) of a base, which results in the formation of a neutral chemical compound.
Hence, cesium (Cs) which has a a positive charge of one (+1) and an iodine (I) ion with a negative charge of one (-1) would combine or react to form neutral cesium iodide (CsI).
In conclusion, a salt is most likely to be formed from the reaction of cesium (Cs) and iodine (I).
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1. What does it mean to "tare" a balance?
A 0.4066 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 0.9260 g. What is the mass percentage of chlorine in the original compound? %
Answer:
The mass percentage of chlorine in the original compound is 56.32%
Explanation:
From the question,
Mass of original compound = 0.4066 g
To, determine the mass percentage of chlorine in the original compound,
First, we will determine the mass of chlorine present in the precipitated AgCl
Mass of precipitated AgCl = 0.9260 g
Molar mass of AgCl
Ag = 107.87 g/mol; Cl = 35.45 g/mol
Then, molar mass of AgCl = 107.87 + 35.45
= 143.32 g/mol
Now,
If 35.45 g of chlorine is present in 143.32 g of AgCl
Then, [tex]x[/tex] g of chlorine will be present in 0.9260 g of AgCl
[tex]x = \frac{35.45 \times 0.9260}{143.32}[/tex]
[tex]x = 0.2290[/tex] g
Hence, 0.2290 g of chlorine is present in 0.9260 g of AgCl.
Since all of the chloride ion is precipitated,
then 0.2290 g of chlorine is present in the original chloride compound.
Now, for the mass percentage of chlorine in the original compound,
mass percentage of chlorine =
(mass of chlorine in the compound /mass of the chloride compound) × 100%
mass of chlorine in the compound = 0.2290 g
mass of the chloride compound = 0.4066 g
∴ mass percentage of chlorine = [tex]\frac{0.2290}{0.4066}[/tex] × 100%
mass percentage of chlorine = 56.32%
Hence, the mass percentage of chlorine in the original compound is 56.32%
What is the correct name for the compound Pb(CH3CO2)2?
Answer:
Lead(II) acetate trihydrate
Explanation:
hope it helps
a person runs 21.0 km west then turns around and runs 10.0 km east. The persons distance is 31.0 km true or false
Answer:
true.
Explanation:
The total path covered by an object during its entire journey is called the distance covered. It is equal to the sum of all path traveled.
A person runs 21.0 km west then turns around and runs 10.0 km east. The total distance covered will be the sum of 21 km and 10 km.
d = 21 km + 10 km
d = 31 km
Hence, the given statement is true.
Electrolytes dissolve readily in water because ________. Electrolytes dissolve readily in water because ________. They are hydrophobic Water molecules can cluster around cations Water molecules can cluster around cations and anions They are held together by electrostatic forces Request Answer
Answer:
E) water molecules can cluster about cations and anions.
Explanation:
Electrolytes are substance that when dissolved in water gives ion.which is cation and anion.
As they disolve in water the water molecules cluster about about cations and anions. As a result of the movement of ions they produce electricity.
Electrolytes are substances that dissociate into ions when dissolved in water. The correct answer is "Water molecules can cluster around cations and anions."
These ions are electrically charged particles, with cations carrying a positive charge and anions carrying a negative charge. When an electrolyte dissolves in water, the water molecules surround and interact with the ions.
Water molecules have a polar nature, with a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. These polar water molecules can cluster around the charged ions, forming a hydration shell. The positive ends of water molecules (hydrogen atoms) are attracted to anions, while the negative ends (oxygen atoms) are attracted to cations.
This clustering of water molecules around the ions is due to the electrostatic forces of attraction between the charged particles and the polar water molecules. This phenomenon helps to stabilize the ions in solution and enables the electrolyte to dissolve readily in water.
Therefore, the correct answer is that electrolytes dissolve readily in water because water molecules can cluster around both cations and anions.
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2. How many nanoliters are in 2.87 x 10-10 gallons?
2.87 x 10-10
gal = ? nL
Solve by dimensional analysis. Use : 1 gal = 4 qt
1 qt = 0.9464 L
Answer:
[tex]1.09nL[/tex]
Explanation:
Hello,
In this case, given that 1 gal equals 4 qt, 1 qt equals 0.9464 L and 1 L equals 1x10⁹ nL, the dimensional analysis turns out:
[tex]2.87x10^{-10}gal*\frac{4qt}{1gal} *\frac{0.9464L}{1qt}*\frac{1x10^9nL}{1L}\\ \\1.09nL[/tex]
Best regards.
Atoms bond to other atoms through their electrons. The following analogy will be used to help us understand how this occurs. Imagine that the atoms of different elements are like kids coming to school. Each of these "kids" come to school with a specific number of crayons. These crayons represent the outer electrons for that atom. Explain how the elements (kids) share, gain, lose their crayons (electrons) and bond to another so that they achieve stability.
Answer:
Explanation:
All atoms (except for group 0 elements) of elements tend to achieve stability by having there outermost shell completely filled; achieving an octet configuration. During chemical bonding, atoms tend to achieve stability majorly in one of the two ways below
1) Ionic or electrovalent bonding: This involves the transfer of electrons from a positively charged ion (cation) to a negatively charged ion (anion). Here, no molecule is formed. For instance, in the formation of a sodium chloride (NaCl) salt. Sodium ion donates the single electron on it's outermost shell (to achieve it's octet configuration) to chloride ion (which needs just one more electron in it's outermost shell to achieve it's octet configuration).
Na⁺ + Cl⁻ ⇒ NaCl
2) Covalent bond: This involves the sharing of lone pair of electrons between two atoms to form a molecule. For example, the outermost shell of an oxygen atom, has two single electrons (that are not in pair), these single electrons can form covalent bond independently with hydrogen atoms (to form water) that also have just one electron in their shells. Hence, at every "covalent bonding site", an electron from oxygen and an electron of hydrogen is shared between the two atoms in order to achieve a stable configuration (Here, we have two "covalent bonding sites").
Adding sodium hydride to ethanol would produce:________
A) CH_3CH_2OCH_2CH_3 + H_2
B) CH_3CH_2OCH_2CH_3 + NaOH
C) CH_3CH_2ONa + H_2
D) CH_3CH_2Na + NaOH
E) CH_3CH_3 + NaOH
The ionization energy of carbon (C) is:________.
I. smaller than that of fluorine (F)
II. larger than that of fluorine (F)
because: ________.
III. Carbon has less electrons and less electron-electron repulsion making it easier to remove an electron from carbon.
IV. The effective nuclear charge of carbon is smaller, so the valence electrons feel a weaker pull from the nucleus.
V. In carbon, the electron being removed is closer to the nucleus.
VI. In carbon, the electron being removed is farther from the nucleus.
Explanation:
Ionization energy refers to the minimum amount of energy required to remove the valence electron of an isolated neutral gaseous atom or molecule. Generally, ionization energy increases from left to right across the periodic table.
This means that the ionization energy of Carbon would be smaller than that of Fluorine. The reason for this is due to the smaller effective nuclear charge.
The effective nuclear charge and the atomic size are two factors that ionization energy depends on.
The correct option is;
IV. The effective nuclear charge of carbon is smaller, so the valence electrons feel a weaker pull from the nucleus.
Write balanced equations for the following reactions
a. 23892U(α,n)24194Pu.
b. 92238U(α,n)94241Pu.
c. 147N(α,p)178O.
d. 5626Fe( α, α)6029Cu.
Answer:
See explanation
Explanation:
The shorthand nuclear reaction equations have been given; the first particle in the parentheses is a reactant particle while the second particle is a product particle. These can now be rewritten as the longhand equations as follows;
238/92U + 4/2 He -------> 241/94Pu + 1/0 n
238/92U + 4/2 He ------> 241/94Pu + 1/0 n
14/7N + 4/2 He------> 17/8O + 1/1 p
56/26Fe + 2 4/2 He----> 60/29Cu + 4/2 He
List the inner planets in order from the closest to the Sun to the farthest from the Sun.
I HAVE 10 MINS HELP!!
Answer:
mercury, venus, mars, earth, jupiter, saturn, uranus, neptune
Explanation:
Answer:
Mercury,Venus,Mars,Earth,Jupiter,Saturn,
Uranus,Neptune.
Explanation:
Hope this helps
The "Na" is called the element
Answer:
No
It's called a formula of an element which is a sodium element.
7. Elements in group one are called.
Answer:
The answer is alkali metals
Explanation:
Choices: True, False. Select all that are True.
ON2 means that each nitrogen atom is separate from each other (not bonded).
N2 means that each nitrogen atom is bonded to another and they act as a unit.
2N is considered a molecule whereas N2 is not.
2N means that each nitrogen atom is separate from the other (not bonded).
2N means that each nitrogen atom is bonded to another and they act as a unit.
Answer:
a
Explanation:
N2 means that each nitrogen atom is bonded to another and they act as a unit. 2N means that each nitrogen atom is separate from the other. So the correct options are B and D.
What is a nitrogen molecule?
The chemical element nitrogen has an atomic number of seven (it has seven protons in its nucleus). Two nitrogen atoms are securely linked together to form the chemical molecule known as molecular nitrogen (N2). At normal temperatures and pressures, molecular nitrogen is a colorless, odorless, tasteless, and inert gas.
Nitrogen makes up around 78% of the Earth's atmosphere. Molecular nitrogen is a molecule that is practically inert due to the strong triple bond that connects its atoms. But when nitrogen bonds do break, the ensuing substances are frequently quite reactive.
Numerous different forms of contaminants include atoms of nitrogen. Nitric oxide (NO) and nitrogen dioxide can be produced during high-temperature combustion when nitrogen gas is present, such as in car engines (NO2). Both gases contribute to the creation of nitric acid, which is a component of acid rain, and peroxyacetyl nitrate (PAN), which is a key component of smog. They are both toxic on their own.
Therefore the correct options are B and D.
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what is a single celled organism able to do
Answer:
The one cell of a unicellular organism must be able to perform all the functions necessary for life. These functions include metabolism, homeostasis and reproduction. Specifically, these single cells must transport materials, obtain and use energy, dispose of wastes, and continuously respond to their environment.
Answer:
A single celled Organism is able to get energy from complex molecules, to move, and to sense their environment.
Explanation:
The ability to perform these and other functions is part of their organization.
HCl is added to a solution containing barium and calcium ions. If a precipitate is formed, what is it? A. No precipitate is formed B. Barium chloride
Answer:
A. No precipitate is formed
Explanation:
Hello,
In this case, since the reactions are:
[tex]Ca^{2+}(aq)+2HCl(aq)\rightarrow CaCl_2(aq)+2H^+(aq)\\\\Ba^{2+}(aq)+2HCl(aq)\rightarrow BaCl_2(aq)+2H^+(aq)[/tex]
We evidence no formation of insoluble salts or precipitates since both calcium and barium chlorides are largely soluble in water due to the ionic bond which binds them, thus A. No precipitate is formed.
Regards.
2. Problem: Is colored or black and white text more easily remembered? Hypothesis: If the text is colored, then the text is more easily remembered. Dependent variable: Independent variable: Control: Constants: ___________________________________________________________________ 3. Problem: Does temperature affect the speed of ants? Hypothesis: Independent variable: Dependent variable: Control: Constants: ----------------------------------------------------------------------------------------------------------------------------- 4. Problem: Does pH of the soil affect the growth of strawberries? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 5. Problem: Does caffeine raise a person’s blood pressure? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 6. Problem: Is heart rate affected by music? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 7. Problem: Does bleach kill bacteria? Hypothesis: Independent variable: Dependent variable: Control:
Answer:
This question contains a lot of subsections. Please find the variables to each question below
Explanation:
Hypothesis is a testable explanation to a scientific question. It aims at proffering a testable solution to an observed problem. It usually goes in an IF, THEN format.
Dependent variable is the variable being measured in an experiment, while the independent variable is the variable that is manipulated or changed by the experimenter.
The control group is the group that does not receive the experimental treatment while constant is the variable that is kept unchanged for all groups in the experiment.
Based on this explanation, find the answers to the hypothesis, independent variable, dependent variable, constant, and control groups to each question.
2. Dependent variable: How easy it is to remember
Independent variable: Color of the text
Control: Group given Black and White text to read
Constants: Same text
3. Hypothesis: If the temperature is increased, THEN the speed of ants increases or move faster
Independent variable: TEMPERATURE
Dependent variable: SPEED OF ANTS
Control: Ants placed in room temperature
Constants: SAME KIND OF ANTS
4. Hypothesis: IF the pH of the soil is acidic or alkaline, THEN the growth of strawberries will be inhibited
Independent variable: pH of soil
Dependent variable: Growth of strawberries
Control: Strawberries grown in a Neutral pH soil
Constants: Same type of plants (strawberries)
5. Hypothesis: IF caffeine is taken, then the blood pressure will be increased or raised.
Independent variable: CAFFEINE
Dependent variable: BLOOD PRESSURE
Control: Group given no caffeine
Constants: Same amount of caffeine
6. Hypothesis: IF music is played, THEN the heart rate increases
Independent variable: MUSIC
Dependent variable: HEART RATE
Control: Groups placed where no music is played
Constants: Same type of music, same time music runs for etc.
7. Hypothesis: IF bleach is present/used, THEN bacteria will die
Independent variable: Bleach
Dependent variable: Death of bacteria
Control: Bacteria given no bleach
Constants: Same species of bacteria, Same type of bleach
This type of pollution will decay naturally
A space air is at a temperature of 75 oF, and the relative humidity (RH) is 45%. Using calculations, find: (a) the partial pressures of the dry air and water vapor, (b) the humidity ratio of the moist air, and (c) the specific volume of the moist air. Assume standard sea-level pressure.
Answer:
A) Partial Pressure of dry air = 13.32 KPa
Partial Pressure of water vapour = 1.332 KPa
B) Humidity ratio; X = 0.0691
C) V_p = 0.8384 m³/Kg
Explanation:
A) We are given;
Temperature = 75°F
Relative Humidity = 45%
Now,to calculate the partial pressure, we will use the relationship;
Relative Humidity = (Partial Pressure/Vapour Pressure) × 100%
Making partial pressure the subject;
Partial Pressure = Relative Humidity × Vapour Pressure/100%
From the first table attached, at temperature of 75°F, the vapor pressure is 29.6 × 10^(-3) bar = 29.6 KPa
Thus;
Partial Pressure of dry air = (45 × 29.6)/100
Partial Pressure of dry air = 13.32 KPa
From online values, vapour pressure of water vapour at 75°F = 2.96 KPa
Thus;
Partial Pressure of water vapour = (45 × 2.96)/100 = 1.332 KPa
B) humidity ratio of moist air is given as;
X = 0.62198 pw / (pa - pw)
where;
pw = partial pressure of the water vapor in moist air
pa = atmospheric pressure of the moist air
Thus;
X = (0.62198 × 1.332)/(13.32 - 1.332)
X = 0.0691
C) Formula for moist air specific volume is;
V_p = (1 + (xRw/Ra) × RaT/p
Where;
V_p is specific volume
T is temperature = 75°F = 297.039 K
p is barometric pressure which in this case is standard sea level pressure = 101.325 KPa
pw is partial pressure of the water vapor in moist air = 1.332 KPa
Rw is individual gas constant for water = 0.4614 KJ/Kg.K
Ra is individual gas constant for air = 0.2869 KJ/Kg.K
V_p = (1 + (0.0691 * 0.4614/0.2869)) × 0.286.9 * 297.039/101.325
V_p = 0.8384 m³/Kg
Which of the following processes is used to test for drunk driving and also to break down alcohol in the body?
a. transesterification
b. E1 elimination
c. alcohol oxidation
d. ketone reduction
Answer:
c. alcohol oxidation
Explanation:
The police often use a device called a breathalyzer to test drivers suspected of being drunk. The chemical basis of this device is a redox reaction. A sample of the driver’s breath is drawn into the breathalyzer, where it is treated with an acidic solution of potassium dichromate. The alcohol (ethanol) in the breath is converted to acetic acid as shown in the following equation:
3 CH₃CH₂OH + 2 K₂Cr₂O₇ + 8H₂SO₄ → 3 CH₃COOH + 2 Cr₂(SO₄)₃ + 2 K₂SO₄ +1 11H₂O
ethanol + potassium dichromate (orange yellow) + sulfuric acid → acetic acid + chromium(III) sulfate (green) + potassium sulfate + water
In this reaction, the ethanol is oxidized to acetic acid and the chromium(VI) in the orange-yellow dichromate ion is reduced to the green chromium(III) ion. The driver's blood alcohol level can be determined readily by measuring the degree of this color change (read from a calibrated meter on the instrument).
What are the final hydrogen ion concentration and pH of a solution obtained by mixing 400mL of 0.2M NaOH with 150mL of 0.1M H3PO4?
Answer : The final hydrogen ion concentration is [tex]1.58\times 10^{-13}M[/tex]
Explanation :
The chemical reaction equation will be:
[tex]H_3PO_4+3NaOH\rightarrow Na_3PO_4+3H_2O[/tex]
In this reaction, 1 mole of [tex]H_3PO_4[/tex] reacts with 3 mole NaOH.
So, the number of moles of [tex]H_3PO_4[/tex] present in 150 ml of 0.1 M solution is calculated as follows.
Number of moles = Concentration × Volume
Number of moles = 0.1 M ×0.150 L = 0.015 mol
As it reacts with 3 moles of NaOH.
Number of moles of NaOH = 3 × 0.015 mol = 0.045 mol
So, moles of NaOH in 400 mL of 0.2 M NaOH is as follows.
Number of moles = 0.2 M × 0.4 L = 0.080 mol
Number of moles remained after the reaction = (0.080 - 0.045) mol = 0.035 mol NaOH in 550 ml (400 ml + 150 ml)
As molarity is the number of moles present in liter of solution. Hence, molarity of NaOH is as follows.
[tex]\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of solution}}[/tex]
[tex]\text{Molarity}=\frac{0.035mol}{0.550L}=0.0636M[/tex]
Now we have to determine the hydroxide ion concentration.
As, [tex][OH^-][/tex] = 0.0636 M
[tex]pOH=-\log [OH^-][/tex]
[tex]pOH=-\log 0.0636[/tex]
[tex]pOH=1.20[/tex]
Now we have to determine the pH.
As, pH + pOH = 14
pH = 14 - pOH
pH = 14 - 1.20
pH = 12.8
Now we have to determine the hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
[tex]12.8=-\log [H^+][/tex]
[tex][H^+]=1.58\times 10^{-13}M[/tex]
Therefore, the final hydrogen ion concentration is [tex]1.58\times 10^{-13}M[/tex]
does a light bulb collect energy?NEED HELP ASAP
How are the Celsius, Kelvin, and Fahrenheit
scales similar?
Answer:
Explanation:
Three temperature scales are currently in use. Their units are °F (degrees Fahrenheit), °C (degrees Celsius), and K (kelvin). The Fahrenheit scale, which is the most commonly used scale in the United States outside the laboratory, defines the normal freezing and boiling points of water to be exactly 32°F and 212°F, respectively.
The Celsius scale divides the range between the freezing point (0°C) and boiling point (100°C) of water into 100 degrees. The kelvin is the SI base unit of temperature: it is the absolute temperature scale. By absolute we mean that the zero on the Kelvin scale, denoted by 0 K, is the lowest temperature that can be attained theoretically. On the other hand, 0°F and 0°C are based on the behavior of an arbitrarily chosen substance, water.
The size of a degree on the Fahrenheit scale is only 100/180, or 5/9, of a degree on the Celsius scale. To convert degrees Fahrenheit to degrees Celsius, we write:
?ºC = (ºF - 32ºF) * 5ºC/9ºF
The following equation is used to convert degrees Celsius to degrees Fahrenheit:
?ºF = 9ºF/5ºC * (ºC) + 32 ºF
Both the Celsius and the Kelvin scales have units of equal magnitude; that is, one degree Celsius is equivalent to one kelvin. Experimental studies have shown that absolute zero on the Kelvin scale is equivalent to –273.15°C on the Celsius scale.
Thus, we can use the following equation to convert degrees Celsius to kelvin:
?K = (ºC +273.15ºC) * 1K/1ºC
