Answer:
the volume will increase
Explanation:
The kinetic energy of gas molecules depend upon the temperature . If temperature is increased , the molecules will move faster . When temperature is decreased , they move slower .
Hence when more molecules are added to a gas without changing its temperature , the velocity of gas molecules will remain unchanged .
Since pressure is also constant , it is volume which will be increased .
It can be explained from universal gas formula as follows
PV = nRT
P , R and T is constant ,
V ∝ n
Volume is proportional to n which depends upon number of molecules .
So volume will increase if number of molecules increases .
Which variable is unknown until the experiment is performed?
The variable that is unknown until the experiment is performed is the dependent variable.
In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.
On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.
Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.
The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.
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molar mass of Mg(OH)2 in g/mol
Answer:
2× Ar(O) + Ar(H) ×2 =58,3197 g/mol
Radiometric dating of a rock reveals an age of 1.52 billion years. Given that the half-life of the parent isotope used is 14.0 billion years, what percentage of the parent isotope is still present in the rock
The percentage of the parent isotope still present in the rock is approximately 10.8%.
Radiometric dating relies on the decay of parent isotopes into daughter isotopes over time. The half-life of an isotope is the time it takes for half of the parent isotope to decay into the daughter isotope. In this case, the half-life of the parent isotope used for dating the rock is 14.0 billion years.
To determine the percentage of the parent isotope remaining in the rock, we can calculate the number of half-lives that have passed since the rock's formation. The age of the rock is given as 1.52 billion years, which is equivalent to 1.52/14.0 = 0.1086, or approximately 0.11 half-lives.
Each half-life halves the amount of the parent isotope, so after 0.11 half-lives, the percentage remaining can be calculated as:
Percentage remaining = (1/2)^(number of half-lives) * 100%
Plugging in the value of 0.11 for the number of half-lives, we find:
Percentage remaining = (1/2)^(0.11) * 100% ≈ 10.8%
Therefore, approximately 10.8% of the parent isotope is still present in the rock, based on the given age of 1.52 billion years and the half-life of the parent isotope of 14.0 billion years. The remaining percentage represents the portion of the parent isotope that has not yet decayed into the daughter isotope.
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How many dozens of silver atoms are in the piece of jewelry?.
On a heating curve a plateau corresponds to A) a change in temperature of a liquid. B) a change in temperature of a solid. C) a change in temperature of a gas. D) a change of state. E) the solid being broken into smaller pieces.
When cadmium (Cd) is mixed with hydrochloric acid (HCI), a single-displacement reaction occurs.
What will be the product or products?
O CaCl2
O CaCl2 + H2
O Cl and H
O Cd + HCI
Answer:is Cl and H
Explanation:
2Cd+2Hcl=2CdCl + H2
What are two physical properties of lead?
Answer:
low melting point, high density, and acid resistance
Explanation:
after the fischer esterification, you will perform liquid-liquid extraction to isolate the ester. how will this be accomplished?
After the Fischer Esterification, you will perform liquid-liquid extraction to isolate the ester. This can be achieved by mixing the reaction mixture with a non-polar solvent. The two immiscible liquids are then separated using a separating funnel. This process is also known as solvent extraction.
The non-polar solvent extracts the ester from the reaction mixture and is then separated using a separating funnel. Fischer esterification is the chemical process of esterification that involves the reaction of a carboxylic acid with an alcohol to form an ester and a water molecule. This reaction requires a strong acid catalyst, typically concentrated sulfuric acid or hydrochloric acid. Liquid-liquid extraction. Liquid-liquid extraction is a chemical separation process that is based on the distribution of a compound between two immiscible liquids. This process involves the extraction of a desired compound from one liquid phase into another liquid phase by the use of a suitable solvent. The two immiscible liquids are then separated using a separating funnel. This process is also known as solvent extraction.
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The volume of a gas is increased from 0.5L to 4.0 L while the temperature is held constant. Thepressure of the gas:A. increases by a factor of fourB. decreases by a factor of eightC. increases by a factor of eightD. increases by a factor of two
The volume of a gas is increased from 0.5L to 4.0 L while the temperature is held constant. The pressure of the gas decreases by a factor of eight.
Charles's Law- Charles's Law is a physical law that states that for a fixed mass of gas held at a constant pressure, the volume of the gas is directly proportional to the absolute temperature of the gas.
V1/T1=V2/T2 (Constant Pressure)
Boyle's Law- Boyle's law is a gas law that states that the pressure applied to a gas at a constant temperature is inversely proportional to the volume of the gas.
P1V1 = P2V2 (Constant Temperature)
What is the ideal gas law? The ideal gas law is a physical law that describes the behavior of an ideal gas in terms of its pressure, volume, temperature, and the number of particles present.
PV = nRT
Where: P = pressure, V = volumen = number of particles present, R = ideal gas constant, T = absolute temperature
What happens to the pressure of the gas when the volume of the gas is increased? The pressure of the gas decreases when the volume of the gas is increased while holding the temperature constant. Therefore, when the volume of the gas increases from 0.5L to 4.0 L while the temperature is held constant, the pressure of the gas decreases.
The correct answer is B. decreases by a factor of eight.
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what is the role of electric current in electrolysis
Answer:
Electrolysis, process by which electric current is passed through a substance to effect a chemical change. ... Electric current (i.e., electrons) enters through the negatively charged electrode (cathode); components of the solution travel to this electrode, combine with the electrons, and are transformed (reduced)
How many grams of water are needed to absorb 456 J if its temperature goes from 22.7 to 98.3 Celsius?
The mass of water needed to absorb 456 J is 1.44 g
We'll begin by calculating the change in the temperature of the water.
Initial temperature of water (T₁) = 22.7 °C
Final temperature (T₂) = 98.3 °C
Change in temperature (ΔT) =?ΔT = T₂ – T₁
ΔT = 98.3 – 22.7
ΔT = 75.6 °CFinally, we shall determine the mass of the waterHeat absorbed (Q) = 456 J
Change in temperature (ΔT) = 75.6 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Mass of water (M) =?Q = MCΔT
456 = M × 4.184 × 75.6
456 = M × 316.3104
Divide both side by 316.3104
M = 456 / 316.3104
M = 1.44 gTherefore, the mass of the water is 1.44 g
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Ammonia NH3 chemically reacts with oxygen gas O2 to produce nitric oxide NO and water H2O.
What mass of nitric oxide is produced by the reaction of 10.g of ammonia?
Be sure your answer has the correct number of significant digits.
2 moles of ammonia and 2.5 moles of oxygen gas will produce 2 moles of nitric oxide and 3 moles of water.
The reaction between ammonia (NH3) and oxygen gas (O2) to produce nitric oxide (NO) and water (H2O) is shown below:4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)The balanced equation shows that 4 moles of ammonia react with 5 moles of oxygen gas to produce 4 moles of nitric oxide and 6 moles of water. To determine the amount of products formed when a certain amount of reactants is used, we need to use stoichiometry.Suppose we react 2 moles of ammonia with 2.5 moles of oxygen gas. From the balanced equation, we can see that the ratio of moles of ammonia to moles of oxygen gas is 4:5. Therefore, ammonia is the limiting reagent because only 2 moles of ammonia are available, which is not enough to react with 2.5 moles of oxygen gas.To determine the amount of products formed, we will use the mole ratio from the balanced equation:4 moles NH3 : 5 moles O2 : 4 moles NO : 6 moles H2O2 moles NH3 is equivalent to (5/4) × 2 moles O2 = 2.5 moles O2So, 2 moles NH3 + 2.5 moles O2 → 2 moles NO + 3 moles H2O.The number of significant digits in the answer will depend on the number of significant digits in the given amounts of reactants.
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How many MOLES are in 45g of KNO3?
O 0.45 mol
O..0445 mol
O .045 mol
O 445 mol
Answer:
Its either B or D?
i think i would say just choose which one you think is right
For each of the following pairs of compounds, choose which will elute faster in a TLC experiment (i. E. , which compound will have a larger Rf value). Explain what factors led to your choice. 6 pt a. Naphthalene or 1-Bromonaphthalene Choice Explanation: 1-Bromonaphthalene is more polar than Naphthalene. If polarity is higher, its Rf value will be less which means that molecule will travel less distance (lower Rf value) during a TLC experiment
In a TLC experiment, the compound with the larger Rf value will elute faster. In the case of naphthalene and 1-bromonaphthalene, the 1-bromonaphthalene will elute faster and have a larger Rf value.
This is because 1-bromonaphthalene is more polar than naphthalene. Polar compounds have a stronger attraction to the polar stationary phase (such as the silica gel in TLC plates) and will interact more with it, resulting in a lower Rf value.
Naphthalene, on the other hand, is less polar and will have a weaker interaction with the stationary phase, allowing it to travel further and have a higher Rf value.
The polarity of a compound is determined by the presence of functional groups or atoms that create an uneven distribution of charge or electronegativity. In this case, the bromine atom in 1-bromonaphthalene increases its polarity compared to naphthalene, leading to a stronger interaction with the stationary phase.
In summary, the 1-bromonaphthalene will elute faster in a TLC experiment and have a larger Rf value compared to naphthalene due to its higher polarity resulting from the presence of a bromine atom.
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What is the temperature in kelvins of -14°C?A. -3822 KB. -287 KC. 259 KD. -19.5 K
Answer
C. 259 K
Explanation
Given:
Temperature = -14°C
What to find:
The temperature in kelvins of -14°C.
Solution:
Conversion factor: 0°C + 273 = 273 K
Therefore, 14°C + 273 = 259 K
The temperature in kelvins of -14°C is 259 K
What is the molar mass of KNO3?
Answer:
K=39, N=14, O=16. So molar mass of KNO3= 39+14+3(16)= 101
Im Wrong?
Nitrogen has two naturally occurring isotopes.
Predict the number of neutrons in the two isotopes of
nitrogen, N.
How many protons?
Electrons?
Answer:
Nitrogen has 7 protons and 7 electrons and 7 neutrons.
Explanation:
The atomic number of an element is the number of electrons and protons they have. The atomic mass - the atomic number of an element equals the number of nuetrons. The atomic mass of nitrogen is 14 and the atomic number is 7 therefore we have to subract, 14-7=7.
If a solution is saturated and more salt that is added falls to the bottom of the container what is it called?
A: Supersaturated
B: Saturated
C: Unsaturated
Answer:
The answer is B
Explanation:
A solution that contains a relatively low concentration of solute is called dilute, and one with a relatively high concentration is called concentrated. If we add more salt to a saturated solution of salt, we see it fall to the bottom and no more seems to dissolve.
Why do elements of same gropu show similar chemical properties?
Which of the following is true?
a Liquids are denser than gases
b Liquids are less dense than gases
c Liquids and gases are the same density
d None of the above
Density of liquids is more than that of gases. Thus, the correct answer is (a).
A liquid has molecules that are closely spaced out. As a result, liquids have a higher density than gases.
The mass of a material per unit of volume is its density. Density is most frequently represented by the symbol ρ, but Latin letter D may also be used.
The amount of items in a space—which might include humans, animals, plants, or objects—is referred to as the space's density. Divide the number of items by the area's measurement to determine density. A country's population density is calculated by dividing its total population by its area, expressed in square kilometres or miles.
In comparison to liquids and gases, solids are denser than liquids and gases, respectively. The solid's particles are close to one another and have very little room to move. In a liquid, the particles are often still in contact, although there are gaps between them. There are considerable gaps between the gas particles.
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34. Explain how dimensional analysis is used to solve
problems.
By understanding conversion factors and how they are related to each other we can use dimensional analysis to solve problems.
Dimensional Analysis is a step by step approach to solving problems in Physics, Chemistry , and Mathematics. It involves having a clear knowledge and understanding to be able to convert a given unit to another in the same dimension using conversion factors and knowing how they are related to each other.
For instance, In Chemistry, we want to Convert 120mL to L.(note that ml stands for millilitres and ;L stands for litres)
Or first approach will be to write out the conversion factor related to our problem which is
1000ml =1L
such that 120ml = (we cross multiply))
giving us 120ml x 1L/1000ml =0.12L
This same process is applied to convert any type of dimensional analysis problems be it physics or mathematics.
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the content of webpages must always remain within the capabilities of html. true or false
True. The content of webpages must always remain within the capabilities of HTML (Hypertext Markup Language).
HTML is the standard markup language used to structure and format content on the web. It provides a set of tags and attributes that can be used to create different types of elements, such as headings, paragraphs, lists, images, and links.
The content of a webpage is written using HTML tags, and the browser interprets these tags to display the content in a specific way. For example, the <h1> tag is used to create a main heading, while the <p> tag is used to create a paragraph. By using HTML tags correctly, web designers can ensure that their content is displayed consistently across different browsers and devices.
However, it is important to note that HTML is not capable of displaying all types of content. For example, HTML is not designed to display multimedia content such as videos or audio files. To display these types of content, web designers may use other technologies such as JavaScript or Flash.
Overall, while HTML provides a set of tools for structuring and formatting content on the web, it is not capable of displaying all types of content. Web designers must use other technologies and techniques in conjunction with HTML to create rich and interactive web experiences.
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Properties of substances W, X, Y and Z are listed below:
W: A liquid metal
X: A liquid non-metal
Y: Gaseous non-metal
Z: A non-metal which conducts electricity.
W, X, Y and Z are respectively
a. Copper, phosphorus, nitrogen and carbon
b. Mercury, bromine, oxygen and graphite.
c. Iron, iodine, hydrogen and oxygen
d. Mercury, sulphur, chlorine and hydrogen
\(\mathrm\red{b.~Mercury,~Bromine,~Oxygen~and~Graphite}\)
• Mercury is a liquid metal .
• Bromine is a liquid & a non metal .
• At last, oxygen & graphite are non metals but conduct electricity .
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Two ways to create a negative ion
The direct capture of a free electron by a neutral atom is the easiest technique to create negative ions.
How is an ion made to be negatively charged?
Positive ions made by a positive ion source can be double-charged-exchanged to create negative ions,
or negative ions can be directly extracted from a negative ion source.
creation of negative ions.
Negative ions and other energy levels below the vacuum level can be inhabited by adding an electron to an atom or molecule.
The atom has a net negative charge of e despite not being stable.
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34
1 point
The iodate ion is given by the formula 103 1. Which is the correct formula for the periodate ion?
-2
103
1
103
N
10
104
3
Previous
4
5
6
Answer:
Got morning the iodate for the
A 54.2 g sample of Magnesium has an initial temperature of 55°C and a final temperature of 78°C, and the specific heat of Magnesium is 1.023 J/g°C. If the sample absorbs 1300 J of heat energy, what is the change in temperature?
Change in temperature of the Magnesium sample is calculated as 23.7°C.
What is meant by heat energy?Heat energy is a form of energy that is transferred between objects or systems due to temperature difference. It flows from hotter to cooler objects, and its amount is measured in joules.
As we know; Q = m c ΔT
Q is the amount of heat absorbed, m is mass of the object, c is specific heat, and ΔT is change in temperature.
ΔT = Q / (m * c)
ΔT = 1300 J / (54.2 * 1.023 )
ΔT = 23.7°C
Therefore, the change in temperature of the Magnesium sample is 23.7°C.
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What happens to one of the
neutrons in a carbon-14 nucleus?
Answer: Because carbon-14 has six protons, it is still carbon, but the two extra neutrons make the nucleus unstable. In order to reach a more stable state, carbon-14 releases a negatively charged particle from its nucleus that turns one of the neutrons into a proton.
The Kyoto Protocol is to carbon dioxide as the Montreal Protocol is to ________. A) nitrous oxide B) ozone C) methane D) halocarbons E) carbon monoxide
The Kyoto Protocol is to carbon dioxide as the Montreal Protocol is to ozone Option (b)
The Montreal Protocol and the Kyoto Protocol are both international agreements aimed at reducing or eliminating the emission of substances that contribute to environmental problems.
The Montreal Protocol, signed in 1987, was specifically focused on addressing the issue of ozone depletion in the Earth's atmosphere. It targeted the production and consumption of halocarbon compounds, including chlorofluorocarbons (CFCs) and other ozone-depleting substances. These chemicals were widely used in refrigeration, air conditioning, and other industrial processes. By regulating their production and use, the Protocol aimed to protect the ozone layer and prevent the harmful effects of increased UV radiation on human health, ecosystems, and the environment.
The Kyoto Protocol, signed in 1997, was designed to address the issue of global climate change by reducing greenhouse gas emissions, primarily carbon dioxide , which is the main contributor to global warming.
Therefore, the Kyoto Protocol is to carbon dioxide as the Montreal Protocol is to ozone.
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A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane?
A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.
The cell is surrounded by a membrane called as cell membrane . cell membrane is a semipermeable membrane. semipermeable membrane is the type of membrane which allows solvent particles to pass through it . or some molecules or ion . Therefore , many cells benefited by cell membrane as they can pass through it.
Thus, A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.
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A glass of unsweetened lemonade has a mass of 255 grams. A spoonful of sugar is massed before stirring It Into the lemonade and you find that
It has a mass of 25 grams.
• How much mass will the sweetened lemonade have once you stir in the sugar?
• State and explain the science concept that leads you to this answer.
Answer:
270
Explanation:
Once you add more mass to something the mass doesn’t go away you add more mass.
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