Answer: Heat energy is absorbed by the substance
Explanation: Boiling is an endothermic process in which water molecules absorbs heat energy to break bonds. During boiling the amount of heat absorbed is used to break chemical bonds of water having its temperature remains in constant. The absorption of heat energy increases the kinetic energy of molecules which allows them to escape into the gaseous phase.
Assume that the batteries in a flashlight are rechargeable. What energy conversion would have to take place in order to recharge the batteries?
Electrical to chemical energy
Explanation:
If the batteries in a flashlight are rechargeable, the energy conversion that would take place to recharge the battery is from electrical to chemical energy.
A battery is an electrochemical cell in which chemical reactions produces electrical currents. This is a typical energy conversion from chemical to electrical energy. When such batteries are to be recharged, the revere process is followed. Electrical energy are used to drive chemical reactions. This in turn makes the battery recharged and on its own, it can further chemical reactions to produce electrical energy. During charging, the potential of the battery increases.learn more:
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Final answer:
To recharge flashlight batteries, electrical energy from a power source is converted into chemical energy within the batteries, which can later be reconverted into electrical energy to provide power.
Explanation:
To recharge the batteries in a flashlight, the necessary energy conversion involves transforming electrical energy into chemical energy. This is achieved by applying an electric current to the batteries using a charger. The electric current reverses the chemical reactions that took place in the battery during discharge. When the batteries are being used after charging, this stored chemical energy is then converted back into electrical energy to power the flashlight. The processes involved are quite efficient, boasting an efficiency of around 90 percent for each step. Thus, the overall efficiency from electrical to chemical to electrical energy and eventually to mechanical energy (in the case of an electric motor) is over 75 percent.
7944/0.024 = _______ give the answer to the correct number of significant figures?
Answer:
330,000
Explanation:
Since there are only 2 significant figures in 0.024 ( and 0.024 is the number with the least number of significant numbers), the answer is 330,000, not 331,000.
Near the ceiling of a room air is warmer. The warm air rises because of
Answer:
convection
Explanation:
heat will always rise
Answer:
Convection
Explanation:
The higher an electromagnetic wave's frequency, the lower its
O A. speed
O B. energy
O c. wavelength
O
D. amplitude
SURN
Answer:
C)wavelength
Explanation:
if the wavelength of a light wave is shorter, that means that the frequency will be higher because one cycle can pass in a shorter amount of time. ... That means that longer wavelengths have a lower frequency. Conclusion: a longer wavelength means a lower frequency, and a shorter wavelength means a higher frequency!
A 18.00 g candy bar is found to contain 11.00 g of sugar. How many mg of sugar does the candy bar contain ?
Answer:
11,000 milligrams
Which of the following values is equal to 1 micrometer?
0.000001 meter
0.001 meter
1,000 meter
1,000,000 meter
Answer:
its a
Explanation:
Answer:
0.000001
Explanation:
A graph can help scientists display and convey data. what part of a line graph shows trends?
Answer:
The line of best fit
Explanation:
The line of best fit is the average, aka a trend
In a line graph, the line itself, connecting data points, shows trends. Scientists analyze its slope and direction to understand patterns and variations in the data.
In a line graph, the trends are primarily represented by the line itself. A line graph is a type of chart that displays data points connected by a continuous line. Each data point typically represents a pair of values, one on the horizontal axis (usually the independent variable) and one on the vertical axis (usually the dependent variable).
The line in a line graph shows how the dependent variable changes as the independent variable varies. By examining the direction, slope, and shape of the line, scientists and researchers can identify and communicate various trends in the data. Here's how:
1. Direction of the Line: The direction of the line indicates whether the dependent variable is increasing or decreasing as the independent variable changes. A rising line suggests an increase in the dependent variable, while a falling line suggests a decrease.
2. Slope of the Line: The slope of the line represents the rate of change of the dependent variable concerning the independent variable. A steeper slope indicates a more rapid change, while a shallower slope suggests a slower change.
3. Curvature of the Line: Sometimes, the line may curve, indicating a nonlinear relationship between the variables. The curvature might imply acceleration, deceleration, or other complex patterns.
In addition to the line itself, trendlines or best-fit lines can be added to a graph to provide a smoother representation of the overall trend in the data. These trendlines help researchers make predictions and identify general patterns within the data.
Overall, a line graph is a powerful tool for visualizing and conveying data trends, making it a valuable tool in scientific research, data analysis, and communication. Researchers can quickly grasp the direction and magnitude of changes in the dependent variable as it relates to variations in the independent variable.
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_C2H + __02 → __CO2 + __HO
Answer: 2C2H + 5O2 => 4CO2 + 2HO
Explanation: The chemical equation is now balanced.
(50 points!) This diagram is a model of the fluorine atom.
How many electrons, protons, and neutrons are in this atom, and how many additional electrons are needed to completely fill the outer shell of this atom?
A.
9 electrons, 11 protons, 9 neutrons; 0 electrons are needed to completely fill the outer shell of this atom
B.
9 electrons, 11 protons, 9 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
C.
9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
D.
9 electrons, 9 protons, 11 neutrons; 0 electrons are needed to completely fill the outer shell of this atom
Answer:
C
Explanation:
One electron is needed to completely fill the outer shell of this atom.
The number of electrons, protons, and neutrons in the atom are:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 11
The number of additional electron needed is 1
The correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
Fluorine is a member of the group 17 element called Halogens. They have 7 valence electrons.
NOTE: The nucleus contains the neutrons and the protons while the electrons revolve around the nucleus.
From the diagram given above, the following data were obtained:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 11
Valence electron = 7
Now, we can see that the fluorine atom has 7 valence electrons. Thus, fluorine atom will require 1 electron to complete its outermost shell.
Thus, the correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
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What is the kinetic energy of the ball as it is half way through the fall?
Answer:
Explanation:
What is the kinetic energy of the ball as it is half way through the fall?
During a science lab investigating chemical reactions, Mr Grace students place an antacid tablet in a ziplock bag. They recorded the mass of the tablet, 25 g, in the bag, 60 grams. Then they carefully added 50 g of water and quickly seal the bag. The tablet began at this and soon disappeared. The bag was filled with gas. If the total mass of the bag+tablet+water was 135 grams before the reaction, what was the total mass of the bag+liquid+gas after the reaction was completed? A) 60 grams B) 75 grams C) 135 grams D) 270 grams
Answer:
Option- C (135 grams) is the correct answer.
Explanation:
In this experiment the students took tablet of an antacid which when added to water decomposes and produces many products among which some are in gas form. Now, as stated the ziplock bag is quickly sealed after the addition of tablet so it means nine of the gas produced is allowed to escape from the bag.
Therefore, according to law of conservation of mass the mass can neither be created nor destroyed. So, in this experiment there will be no increase in mass because the mass cannot be created and also, there will be no decrease in mass because it can neither be destroyed. So, we will assume that the gas produced is not allowed to escape hence, the total mass of the system (i.e. bag, water, products) will remain the same as they were before the reaction.
Answer:
135 grams
Explanation:
Calculate the atomic mass of element X if there are two isotopes of this element (X-24 and X-28) and 75% of all X atoms are X-28 isotopes.
52 amu
4 amu
27 amu
26 amu
Answer:
Atomic mass = 27 amu
Explanation:
Given data:
Atomic mass of element X= ?
Abundance of X-28 = 75%
Abundance of X-24 = 100 - 75 = 25%
Atomic mass of X-28 = 28 amu
Atomic mass of X-24 = 24 amu
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (75×28)+(25×24) /100
Average atomic mass = 2100 + 600 / 100
Average atomic mass = 2700 / 100
Average atomic mass = 27 amu.
What impact does CO2 in the atmosphere on us and the earth?
Before Sam left for work, he noticed that his car was covered with snow and so went out and started the engine to let it warm up before he left. After eating breakfast, Sam went back to his car to leave for work and noticed that there was no longer any snow on the hood of the car, but the rest of the car still had snow on it. Which of the following correctly explains what Sam witnessed?
A.
The cold from the snow went to the air, which melted the snow.
B.
The cold from the snow was transferred to the car, which melted the snow.
C.
Heat from the engine under the hood transfered to the snow, melting it.
D.
Heat from the air above the car was transferred to the snow on the hood only.
Answer:
Heat from the engine under the hood transfered to the snow, melting it.
Explanation:
((Study Island))
Single-crystal sapphire has a melting point of aorund 2323K what is the melting point in degrees Celsius?
Answer: 2050°C
Explanation:
K = 2323K
°C = K — 273 = 2323 — 273
°C = 2050°C
The melting point of single-crystal sapphire when converted from Kelvin to degrees Celsius is approximately 2049.85°C, indicating the strength of the bonds within its crystal structure, akin to diamond and silicon carbide.
Explanation:To convert the melting point of single-crystal sapphire from Kelvin to degrees Celsius, you subtract 273.15 from the Kelvin temperature. Given that the melting point of sapphire is around 2323K, the calculation would be:
2323K - 273.15 = 2049.85°C
Therefore, the melting point of single-crystal sapphire in degrees Celsius is approximately 2049.85°C. This high melting temperature indicates the strength of the bonds within the crystal structure of sapphire, similar to other compounds with diamond or related structures, such as diamond and silicon carbide, which also have high melting points due to their strong covalent bonds.
y is it necessary to use clear colourless oil in the determination of melting point of naphthalene
Answer:it is necessary to use colourless
Explanation: A pure substance generally has a melting range (the difference between the temperature where the sample starts to melt and the temperature where melting is complete) of one or two degrees. Impurities tend to depress and broaden the melting range so the purified sample should have a higher and smaller melting range than the original, impure sample
Clear colourless oil is necessary in determining the melting point of naphthalene, as it allows for uniform heat distribution, accurate temperature readings, and better viewing of the changes in the sample's state.
Explanation:Clear colourless oil is used in the determination of the melting point of naphthalene to ensure accurate readings. The oil serves as a medium to uniformly distribute heat around the naphthalene sample. If the oil were coloured or not transparent, it would absorb some of the heat, thereby affecting the temperature distribution and potentially the accuracy of the melting point. In addition, the clear oil helps let visible light pass through, allowing for better viewing of the naphthalene as it changes from solid to liquid. Therefore, achieving accurate results in this experiment heavily relies on the use of clear colourless oil.
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How many atoms are there in 10.2 L of Ar gas at STP?
Answer:
3.011×0²³ atoms of Ar
Explanation:
To find no.of atoms of Ar gas in 10.2 L at STP.
At STP 1 mole of a gas occupies 22.4 L and contains 6.022×10²³ atoms/molecules or ions.
At STP
22.4 L contains 1 mole Ar t
10.2 L contains (10.2÷22.4)×1 Ar
[tex]\frac{1}{2}[/tex] mole Ar contains [tex]\frac{1}{2}[/tex]×6.022×10²³
=3.011×0²³ atoms of Ar
Final answer:
To calculate the number of atoms in 10.2 L of Ar gas at STP, we convert the volume of gas to moles and use Avogadro's number. The number of atoms in 10.2 L of Ar gas at STP is approximately 2.742 x [tex]10^{23}[/tex] atoms.
Explanation:
To determine the number of atoms in 10.2 L of Ar gas at STP, we need to convert the volume of gas to moles and then calculate the number of atoms using Avogadro's number.
First, we convert 10.2 L to moles using the molar volume of a gas at STP, which is 22.4 L/mol.
So, 10.2 L of Ar gas is equal to 10.2 L / 22.4 L/mol = 0.455 moles of Ar gas.
Next, we use Avogadro's number, which is 6.022 x 10^23 atoms/mol, to calculate the number of atoms in 0.455 moles of Ar gas.
So, the number of atoms in 10.2 L of Ar gas at STP is 0.455 moles x 6.022 x [tex]10^{23}[/tex] atoms/mol = 2.742 x [tex]10^{23}[/tex] atoms.
Global warming is a theory accepted by a majority of scientists.
Please select the best answer from the choices provided
OT
OF
Answer:
True
Explanation:
Global warming is a theory accepted by a majority of scientists. This statement is True and correct option is option 1.
What is Global warming?Global warming is the phenomenon of a gradual increase in the temperature near the earth’s surface.
This phenomenon has been observed over the past one or two centuries. This change has disturbed the climatic pattern of the earth.
It is the long-term heating of Earth’s surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere.
Therefore, Global warming is a theory accepted by a majority of scientists. This statement is True and correct option is option 1.
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A warm front moves into a region. What kind of weather most likely results?
A. Cold
B. Stormy
C. Clear
D. Hot
Answer:
B
Explanation:
it depends if the weather was cold but ummm they warm and cold air would mix and turn story and watch out tornadoes could also happen
Answer:
Stormy
Explanation:
Apex
Calculate the kelvin scale equivalent of 123 Celsius?
Answer:
123 Celsius is equal to 396.15 Kelvin scale
Explanation:
Which step is not included in carbon cycle
Your answer would be Transpiration
Which career best fits the group of words below?
high voltage lines, low voltage lines, distribution substation
meter reader
geothermal technician
power dispatcher
electrician
Answer:
The answer is "power dispatcher."
Explanation:
"Power dispatchers" are also known as "power distributors." Their field of work is related to controlling the distribution of electricity to the "electrical substations." These substations allow the transmission of electricity to step down from a higher voltage to a lower voltage.
Whenever there is an electrical problem, the power dispatcher also comes into play. They make sure that the power lines are intact and checks for possible damages when typhoons or earthquakes occur.
Thus, this explains the answer.
Answer:
C
Explanation:
Read the chemical equation shown.
Cl2 + 2NaBr → 2NaCl + Br2
Which statement is true about this chemical equation?
Cl (chlorine) is oxidized and Br (bromine) is reduced.
Cl (chlorine) is reduced and Br (bromine) is oxidized.
Na (sodium) is reduced and Cl (chlorine) is oxidized.
Na (sodium) is oxidized and Br (bromine) is reduced.
Redox reactions are the reactions that have been constituting reduction and oxidation. In the chemical equation, chlorine is reduced and bromine is oxidized. Thus, option B is correct.
What is a redox reaction?A redox reaction is a combination of reduction and oxidation reactions. When a reactant loses an electron, then it is called oxidation, whereas the reactant that gains an electron is said to be where the reduction takes place.
The redox reaction is written as,
2 NaBr (aq) + Cl₂ (g) → 2 NaCl (aq) + Br₂ (aq)
Here, oxidation,
2 Br⁻¹ - 2 e⁻ → 2 Br⁰
Reduction,
2 Cl⁰ + 2 e⁻ → 2 Cl⁻¹
From the reaction, NaBr is a reducing agent as it has donated its electron, whereas chlorine gas is an oxidizing agent as it has an accepted electron.
Therefore, in the chemical reaction chlorine is reduced and bromine is oxidized.
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Which of the following is NOT a way that biodiversity is important to an ecosystem?
Question 6 options:
A. Biodiversity can increase the rate of extinction.
B. Different types of decomposers are available to break down many types of waste.
C. If one food source goes extinct other food sources are more likely to be available.
D. Biodiversity makes ecosystems more stable.
Answer:
A. Biodiversity can increase the rate of extinction
Explanation:
That statement is false because variety is better for a better ecosystem. With variety more can survive in certain situations that others cant.
Biodiversity can increase the rate of extinction is not a way that biodiversity is important to an ecosystem. Therefore, option A is correct.
What is biodiversity ?The variety and variability of life on Earth is referred to as biodiversity or biological diversity. A measure of variation at the genetic, species, and ecosystem levels is called biodiversity.
Genetic, species, and ecosystem diversity are the typical three levels of biodiversity that are covered. The various genes that each unique plant, animal, fungus, and bacteria have constituted genetic variety. Both inside and between species, it happens.
Conservation of biodiversity safeguards the genetic, microbial, animal, and plant resources needed for agriculture, food production, and ecosystem services like soil nutrient cycling, pest and disease control, preventing erosive processes, and pollination plants and trees.
Thus, option A is correct.
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Al2(SO4)3 + BaCl2 balanced equation
Answer:BaCl2 + Al2(SO4)3 -->BaSO4 + AlCl3.
Explanation:
Is Li2o+h2o=LiOH combustion
Answer: No
Explanation:Combustion is the process where a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water.
Combustion reaction:
CH + O2 => CO2 + H2O
The particles that are found in the nucleus of an atom are
a. neutrons and electrons
c. protons and neutrons
b. electrons only
d. protons and electrons
Answer: option c. protons and neutrons
Explanation:
Answer: Protons and Neutrons
Explanation: The nucleus is a dense structure in an atom. It consists of positively charged protons and neutrally charged neutron. This makes the nucleus a positively charged region in an atom.
Tissues are made up of different types of organs true or false
Answer: False
Explanation: Organs are made up of different tissues
The statement is false. Tissues are made up of similar cells that share a common function. Organs are made from different types of tissues that work together.
Explanation:The statement in the question is false. In biology, tissues are groups of similar cells that have a common structure and function. However, they do not form organs independently. Actually, the hierarchy in biological organization is cells - tissue - organ - organ system.Organs are made up of different types of tissues that work together to perform a specific function or set of functions. For example, the heart is an organ made up of cardiac tissue which allows it to contract and pump blood around the body.
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A certain quantity of ammonium nitrite is separated into its polyatomic components, and each polyatomic ion is then carefully transferred and stored in an individual 100-Liter container. If the container containing ammonium nitrite has a density of 2g/L, how many mols of nitrite are in the second container?
Answer:
5000
Explanation:
you do stuff and more stuff
if you were trying to heat 1g water from temperature of 5C to 6 C, how much heat would be required to do so?
Answer:
The heat required is 4.18 J
Explanation:
First you need to know what is specific heat capacity ,
Specific Heat Capacity : The amount of heat required to raise the temperature of 1 gram of substance by one degree .
The specific heat capacity of water is 4.18 J/gC.
This means that to increase the temperature of 1 gram of water by one degree , 4.18 J of energy is needed.
The formula to calculate the heat is given by :
[tex]q=mc\Delta T[/tex]
q = heat absorbed/emitted
m = mass of the substance
[tex]\Delta T[/tex] = Change in temperature
c = 4.18 J/gC
Here , m= 1 gram
[tex]\Delta T[/tex]= 6 -5 = 1 degree
Put the value in the formula:
[tex]q=mc\Delta T[/tex]
[tex]q=1\times 4.18\times 1[/tex]
q = 4.18 J
Unit conversion :
m = gram
c = J/gram C
T = C
q = mcT = gram x J/gram C x C
q = J