A box falls from a high shelf. If the box reaches a velocity of 7.6 m/s
just before it hits the ground, the height of the shelf is 2.9 m.
given that :
velocity = 7.6 m/s
the expression for the velocity of an object falls from height
v² = 2 g h
g is acceleration due to gravity
h is the height
v is velocity of box
substituting the values in formula , we get :
v² = 2 g h
(7.6)² = 2 × 9.8 × h
h = 57.76 / 19.6
h = 2.9 m
the height is 2.9 m.
Thus, A box falls from a high shelf. If the box reaches a velocity of 7.6 m/s. just before it hits the ground, the height of the shelf is 2.9 m.
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a sample of solid chromium is heated with an electrical coil. if 110 joules of energy are added to a 14.2 gram sample initially at 20.7 °c, what is the final temperature of the chromium?
If 110j of energy are added to a 14.2 gram sample initially at 20.7 °c . the final temperature will be 36.89°C.
Given,
mass of chromium = m = 14.2g
initial temperature = T1 = 20.7°C
Q = m X C X ∆T
where,
Heat exchanged at Q
m = the sample's mass
C = sample specific heat, which for chromium is 0.460 J/goC.
Temperature change (T) = Tfinal - Tinitial.
So, We know,
106J = 13.8 X 0.460J/g°C X (Tfinal - 20.2°C )
(Tfinal - 20.2oC ) = 106J / 13.8 X 0.460J/g°C = 16.69
Tfinal = 16.69°C + 20.2°C = 36.89°C
Hence, The final temperature will be 36.89°C.
What is specific heat capacity?Specific heat capacity is the energy required to increase temperature of material of a certain mass by 1°C, in the unit of J/(kg·K).
mathematically,
Q = mc∆T
Where Q is the amount of heat a body absorbs, m is the body's mass, and t is the temperature rise
C = A substance's specific heat capacity is determined by the material it is made of.
J kg-1 K-1 is the SI unit of specific heat.
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MARKING BRAINLIEST! please help asap (i just need B)
The half-life of the first-order reaction is 1019.12 seconds.
Calculation:-
T1/2 = 0.693 /K.
K = 6.8 × 10⁻⁴ s⁻¹
T- half = 0.693/6.8 × 10⁻⁴ s⁻¹
= 1019.12 second.
A first-order reaction is a reaction that proceeds at a price that relies linearly on the simplest reactant concentration.
The half of-existence of a chemical reaction may be described because of the time taken for the concentration of a given reactant to attain 50% of its preliminary awareness. It is miles are denoted via the image t1/2 and are generally expressed in seconds.
The time required for one 1/2 the atoms of a given quantity of a radioactive substance to crumble. Pharmacology. the time required for the hobby of a substance taken into the frame to lose one-half of its initial effectiveness.
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How is energy transferred during the water cycle? question 7 options: water gains energy during evaporation and releases it during condensation. water releases energy during evaporation and condensation. water gains energy during evaporation and condensation. water gains energy in condensation and releases it in evaporation.
Use the cards to model the reaction between magnesium sulfate and sodium carbonate:
magnesium sulfate + sodium carbonate
› magnesium carbonate + sodium sulfate.
This is double displacement chemical reaction.
The solutions of soluble salts are blended, a strong may additionally shape. Precipitation reactions are used to make insoluble salts. Magnesium sulfate and sodium carbonate are blended with each other and the insoluble salt shaped is magnesium carbonate.
Magnesium carbonate, also known as magnesite, is a common over-the-counter remedy for heartburn and disenchanted belly as a result of the overproduction of acid inside the belly. Magnesite seems a white, yellowish, grayish-white, or brown crystalline solid or crystalline powder.
A salt double displacement reaction, every so often called a double displacement response, is a chemical method concerning the change of bonds between two reacting chemical species which ends up within the creation of merchandise with similar or same bonding affiliations.
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Can an oxygen tank ever be half empty?
Answer is yes because to say that the tank is half empty would mean that all the oxygen molecules only occupy half or less of the tank.
HELP ASAP!! why are sodium (Na) and potassium (K) in the same group in the periodic table?
Sodium and potassium are in the same group because they're both transition metals. Transition metals have a number of properties that make them useful for certain situations. They're reactive, which means they can be easily manipulated. They tend to be abundant, which makes them useful for industrial purposes. And they can form different compounds with each other, which means that when you add them together, you get something new altogether.
This also means that sodium and potassium react with each other easily: in a reaction between the two of them, their electrons leave their outer shells and combine with an electron from another atom or molecule (in this case water). This leaves the atoms with unpaired electrons—which are highly reactive—and creates an energy-rich compound called an ionic bond.
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Question 8 (1 point)
Which of these is primarily composed of carbon and oxygen with significant amounts of hydrogen and nitrogen?
a. a rubber ball
b. plastic pen
c. human skin
d. pencil sharpener
The largest organ of the body, the skin is composed of water, protein, lipids, and minerals. Your skin controls body temperature and guards against infections.
Answer is C, Human Skin
Carbon, hydrogen, oxygen, and nitrogen make up what?Carbon, hydrogen, oxygen, and nitrogen make up proteins (CHON).The Elemental Four: The Building Blocks of Life.The most prevalent element in a person's body, oxygen makes up about 61% of their mass. It is not surprising that oxygen and hydrogen are two of the body's most common chemical elements given that between 60 and 70% of the body is composed of water.Only six elements make up the majority of the human body: oxygen, hydrogen, nitrogen, carbon, calcium, and phosphorus. The remaining mass is composed of sulfur, potassium, sodium, chlorine, and magnesium, which together make up around 0.85% of the total mass. These 11 components are all necessary components.About 96% of the human body is made up of just four of these: carbon (C), oxygen (O), hydrogen (H), and nitrogen (N). There are 25 identified elements that are necessary for life.To Learn more About Human Skin, Refer:
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during the cementation phase of lithification, which two minerals most commonly precipitate into the spaces between clasts, to form cement?
During the cementation phase of lithification, the two minerals that most commonly precipitate into the spaces between clasts, to form cement are Quartz and calcite.
What type of rocks is produced from the process of lithification and cementation?
Some sedimentary rocks are "poorly cemented," meaning they could fall apart in your hands. The two minerals that make up the cement in sedimentary rocks most frequently are quartz and calcite. rock with chemical sediments rocks are composed of minerals that accumulated and solidified in water.
Therefore, The lithified counterparts of sediments are sedimentary rocks. They are primarily created by solidifying unconsolidated sediments that already exist via cementing, compacting, and other means.
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How does the length of the carbon chain change the importance of London Dispersion Forces versus Hydrogen bonding in the boiling point of an organic molecule?
Dispersion Forces are affected by chain length of carbon chain but hydrogen bond is independent of length of carbon chain as it is only related to compound having F,O, and N element.
What are intermolecular forces?Intermolecular forces are the forces that are present between the the molecules and elements
Different types of intermolecular forces are
London dispersion forces
Dipole-dipole forces
Hydrogen bonding
London dispersion forces are due to temporary dipoles that is generated by the uneven distribution of electrons in atoms of a compound or element. It can be made stronger by increasing the number of electrons in the compound.
In our question we are increasing length of the carbon chain, Which means the number of of electron is increasing and hence the London dispersion forces force is also increasing and hence the boiling point will also increase
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What will the effect be on the resolution and Rf values in the following situations? (paper chromatography experiment)
a) The watch glass is left off the beaker during the run
b) The chromatogram was left in the beaker too long so that the solvent front went all the way to the top of the paper in 5 minutes before the paper was removed
c) The spots were too big
d) A student used a shorter piece of chromatographic paper
Chromatography is primarily used as a method for the analysis and separation of chemical mixtures. Chromatography is the process of causing the constituent parts of a mixture to migrate differently from a restricted starting point in a particular medium, in this case, filter paper.
A) The air pressure above the beaker would disrupt the flow of the spots through the TLC, resulting in less resolution on the TLC plate, if the watch glass is not kept above the beaker for running paper chromatography. Despots would look, and even swarm, as a result.
B) The solvent is not allowed to move completely through the TLC plate because if the chromatogram is left in the beaker for a long time so that the solvent completely flows to the top, all of the spots would reach the solvent front and we would be unable to distinguish between the spots present in the TLC plate.
C). The TLC spotting should be performed in a very minute manner. Assume that if this substance is quite thick and a few of spots are seen apart, the TLC plate would drag and the resolution would be thrown off. As a result, it is challenging to tell the spots apart.
D). If the chromatographic paper is very short, it will be difficult to distinguish between the spots because, if more than one spot is present in a given compound, it will be harder to determine how many spots there are if there is a smaller distance between them. The TLC sheet's shorter length is the cause of the decreased space between the supports. Therefore, it is preferable to avoid using this longer TLC sheet so that the resolution is high and the spots can be easily identified.
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Which is not supporting evidence for the Big Bang Theory?
Background Radiation
Big Bang Nucleosynthesis
Red Shift
Jupiter's Giant Red Spot
From the list below, which is NOT produced during the Krebs cycle?
A. NADH
B. ATP
C. FADH2
D. CO2
E. NADPH
NADPH is not produced during the Krebs cycle.
The Krebs Cycle is what?
The Krebs cycle, sometimes referred to as the TCA cycle or the citric acid cycle, is a series of chemical processes that take place in the mitochondria and are essential for aerobic respiration, the process by which practically all living things generate energy. It consumes oxygen and produces water and carbon dioxide as waste. Here, ATP is created from ADP. As a result of this cycle, hydrogen and electrons are needed to carry an electron chain.
How Much ATP Is Made During the Krebs Cycle?One Krebs cycle generates two ATPs.
The Krebs cycle produces four CO2, six NADH, two FADH2, and two ATPs for every glucose molecule that is completely oxidized.
Where does the Krebs or TCA cycle happen?The Krebs cycle occurs in mitochondria, which are present in all eukaryotes. The cycle occurs in the mitochondrial matrix and results in the production of chemical energy in the forms of ATP, FADH2, and NADH. These are created when pyruvate, the byproduct of glycolysis, is oxidized.
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if a 348 g sample of water (Cp= 2.06 J/g°C) at 127 °C is cooled to 103 "C, find the change in enthalpy of the system
The enthalpy of reaction once you have m, the mass of your reactants, s, the specific heat of your product, and T, the temperature change from your reaction.
How do you find the change in enthalpy of a system?The enthalpy of reaction once you have m, the mass of your reactants, s, the specific heat of your product, and T, the temperature change from your reaction. To solve, simply enter your values into the formula Δ H = m x s x ΔT and multiply. At constant pressure, enthalpy is a state function whose change indicates the amount of heat transferred from a system to its surroundings. The change in a system's internal energy is the sum of the heat transferred and the work done.Therefore,
Weight water = 348 g
Specific Heat capacity Cp = 2.06 J/g °c
Temperature change ΔT = 127 -103 = 24
Change in enthalpy of the System ΔH = m Cp ΔT
= 348 x 2.06 x 24= 17205.12 J.
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You run an experiment in which two substances chemically react in a closed system. you run the same experiment in an open system. how would the masses of the products in each experiment compare? explain.
If we run an experiment in which two substances chemically react in a closed system and then we run the same experiment in an open system, then the masses of the products in each experiment will be different because the open system allows the interchange of matter and energy with the media.
What is an open system?An open system is an interrelated group pf parts that work together to interchange matter and energy with the surrounding environment, while a closed system does not generate an exchange of matter and energy.
Therefore, with this data, we can see that an open system interchange energy and matter with the environment, while closes systems do it.
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CHECK MY ANSWER WILL GIVE BRAINLIEST
my answer is A :)
You're correct! The answer is A.
please help look at the picture
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
Answer:
30 neutrons
Explanation:
neutrons = atomic mass - atomic number
neutrons = 56 - 26 = 30
Does the photoelectron spectra (C, N, O, F, Ne) suggest a need to refine shell model of atom? If so, is there another model that provides a better explanation of this data? Justify.
Yes, the photoelectron spectra (C, N, O, F, Ne) suggest a need to refine shell model of atom. the another model that provides a better explanation of this data is
The PES data for n=2 we are getting 2 different peaks for elements C, N, O, F, N . That led to the concept of introduction of existence subshells within the shell of an atom. one peak for n=1 one indicates there is one subshell that is donated by 1s-subshell .Maximum capacity of accommodating electron in 1s-subshell is 2. 2 different peaks for elements C, N, O, F, N means for n=2 we have two different subshells .These are donated by 2s and 2p.Maximum capacity of accommodating electron in 2s-subshell is 2 and that in 2p is 6.
The relative energy of electrons in atoms and molecules are measured experimentally using a method called photoelectron spectroscopy (PES). PES is frequently used by scientists to evaluate molecular bonding or to investigate the elemental composition of materials. However, in this article, we'll utilize PES to further our understanding of atomic structure. By examining PES data for pure samples of elements, we'll show how photoelectron spectroscopy directly supports ideas like electron shells and subshells, arrangements of electrons, and more.
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Please help nowwwww please
Answer:
love me and I have a good day for the next few months later they are you going for it is a great deal to the world is the only way I have to the only way I can get a
An object has a mass of 175g and a density of 13 g/mL. Find the volume.
Mathematically, volume is given by the equation: volume = mass / density. The volume = 13.46 cm³.
How is the density calculated?The mass that a substance has per unit volume is known as its density. If two materials occupy the same volume, the one with the higher density will weigh more than the one with the lower density. With a density of 22,590 kg/m3, osmium is the periodic table's densest naturally occurring element. The tips of fountain pen nibs, electrical connections, and other high-wear applications are made of it when mixed with other metals.Given Mass = 175g
Given density = 13 g/mL
Mathematically, volume is given by the equation:
volume = mass / density.
Where, m be the mass = 175
d be the density = 13
Substitute the value in the above equation, we get
volume = mass / density
= 175/13
= 13.46 cm³
Therefore, the volume of the object exists 13.46 cm³.
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Name the chemical that is added to drinking water to kill microbes.
Answer:
Chlorine
Explanation:
Chlorination is the process of disinfecting drinking water by introducing chlorine to eradicate viruses, germs, and parasites. To get drinking water with safe levels of chlorine, various techniques can be utilized.
Another good example of this is when chlorine is added to public pools to protect it from viruses and diseases
Microbes - a microorganism, especially a bacterium causing disease or fermentation.
This is energy that is not moving. It is energy that is not
causing any changes now.
A. Kinetic energy
B Potential energy
Answer:
B potential energy
(kinetic energy is energy that is already moving)
sorry if im wrong
A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing air under high pressure in aspherical air tank that measures 63.0 cm wide.The biologist estimates she will need 5300. L of air for the dive. Calculate the pressure to which this volume of air must becompressed in order to fit into the air tank. Write your answer in atmospheres. Round your answer to 3 significant digits.X5 ?EdoloAr184
The following assumptions are made:
1. Air behaves like an ideal gas throughout the process.
2. The initial pressure will be equal to the atmospheric pressure at sea level, 1atm.
3. The temperature remains constant.
Taking into account the above, we can apply the Boyle-Marriote Law that relates the change in pressure and volume at constant temperature. The equation tells us:
[tex]P_1V_1=P_2V_2[/tex]Where,
P1 is the initial pressure, 1atm
V1 is the initial volume, 5300L
P2 is the final pressure inside the air tank, this is our unknown
V2 is the final volume, this will be calculated using the volume equation for a sphere:
[tex]V_2=\frac{4}{3}\pi r^3[/tex]r is the radius of the sphere, 63.0cm/2=31.5cm
So, the volume of the air tank will be:
[tex]\begin{gathered} V_2=\frac{4}{3}\pi\times(31.5cm)^3=13.1\times10^4cm^3 \\ V_2=13.1\times10^4cm^3\times\frac{1L}{1000cm^3}=131L \end{gathered}[/tex]We clear P2 and replace the known data:
[tex]\begin{gathered} P_2=\frac{V_1P_1}{V_2} \\ P_2=\frac{5300L\times1atm}{131L}=40.5atm \end{gathered}[/tex]The air must be compressed at 40.5atm
Answer: 40.5
How many calories are needed to change a 9.8 grams of solid ammonia at -75 into a gas at room temperature 25 degrees c
The heat needed to change 9.8 grams of solid ammonia at -75 degrees C into a gas at room temperature 25 degrees C is 231 kJ.
What is solid ammonia?
With the formula NH₃, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colourless gas with a strong, pungent odour. It contributes considerably to the nutritional demands of terrestrial creatures by serving as a precursor to 45 percent of the world's food and fertilisers. Biologically, it is a common nitrogenous waste, especially among aquatic animals. About 70% of ammonia is used to create fertilisers, including urea and diammonium phosphate, in a variety of shapes and compositions. Additionally, pure ammonia is sprayed straight onto the ground. Ammonia is also a key ingredient in many commercial cleaning solutions and is a building component for the manufacture of numerous medicinal medicines.
The change in enthalpy, or heat, of a chemical reaction is equal to the change in internal energy of the system plus the work done on the system.
The enthalpy of a system is the sum of its internal energy and the product of its pressure and volume.
In order to change a solid into a gas, the enthalpy of the system must increase by the amount of heat needed to break the intermolecular attractions between the particles of the solid.
The heat of vaporization of ammonia is 23.6 kJ/mol.
Therefore, the heat needed to change 9.8 grams of solid ammonia at -75 degrees C into a gas at room temperature 25 degrees C is 9.8 * 23.6 = 231 kJ.
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determine which items of personal protective equipment (ppe) you will likely use in a general chemistry lab.
The items of personal protective equipment (PPE) you will likely use in a general chemistry lab include a coat, goggles, and gloves.
A lab is an area where different samples of blood, urine, and tissues are identified and tested for research and medical purposes.
In a standard lab, various laser equipment and hazardous chemicals are present that can be harmful at times.
Lab safety rules must be followed to avoid unwanted events happening.
For safety concerns, wear personal protective equipment such as goggles, lab coats, and gloves.
Besides this, dress properly does not go alone in the lab, avoid drinking and eating food, don't taste or smell anything and wash your hands before leaving your workplace.
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Biological life can also affect weathering. Below are listed several ways trees can affect weathering. Which affect listed below is NOT a way trees are considered to affect weathering.
Select one:
a.
Tree roots can grow through rock cracks causing the cracks to expand.
b.
Trees roots (and other vegetation) can release acids that can cause weathering of rock.
c.
Trees (and other vegetation) when decomposing can cause chemical weathering.
d.
When a tree is growing on a rock its weight can crush the rock, as a form of mechanical weathering.
When a tree is growing on a rock its weight can crush the rock, as a form of mechanical weathering is not a way trees are considered to affect weathering
Weathering is a process that breaks down or disintegrates the rocks which are present on the surface of our planet. Biological life can also affect weathering in many ways.
Tree roots can grow through rock cracks causing the cracks to expand. Sprouts can start to grow near cracks in rocks. The sprout when it grows would start to put pressure on the rocks by the roots that would penetrate them and also by the weight it exerts when it turns to a tree.
Tree’s roots (and other vegetation) can release acids that can cause weathering of rock. Plants are capable of producing acids to protect themselves against invaders like microbes and insects. When plants release acids, it would change the chemical composition of the rock that would eventually break the rock. This type of weathering is called chemical weathering
Trees (and other vegetation) when decomposing can cause chemical weathering. When trees decompose it could produce acids like carbonic acid that would help in disintegration of rocks.
When a tree is growing on a rock its weight would not directly crush the rock, as a form of mechanical weathering. Rocks with crack would be the main source of mechanical weathering by rocks.
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round off .00042557 to three significant digits
Round off .00042557 to three significant digits is = 0.000426
What is round of value ?If 5, 6, 7, 8, or 9 come after the number you are rounding, round it up. For instance, 40 is the result of rounding 38 to the nearest ten.If the numbers 0, 1, 2, 3, or 4 come after the number, round it down. If 33 is rounded to the nearest ten, it becomes 30.To estimate a certain number in a context, rounding is a process. Look at the next digit in the correct position to determine how to round a number; if it is less than 5, round down, and if it is 5 or more, round up.Given
The digit of 00042557
Three significant digits is 0.000426
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write about a situation in life that models ionic bonding.
Ionic bonds are formed between a metal and non-metal by losing electron from the metal. Daily life examples of ionic compounds are table salt, baking soda, Epsom salt etc.
What are ionic compounds?Ionic compounds are inorganic compounds with strong ionic bonds formed between a metal and non-metal.
When an electropositive atom donates its electron into an electronegative element, there creates an intermolecular force of attraction. The bonded electron are pulled towards the electronegative element.
We have everyday examples of ionic compounds such as table salt, Epsom salt, baking soda or sodium carbonate etc. Table salt that is sodium chloride or NaCl we use it every day is an ionic compound.
The metal sodium donates it electron to chlorine creates the ionic bond in NaCl. Similarly in sodium carbonate and sodium bicarbonate, ionic bonds are formed between sodium metal and carbon.
Therefore, we can find more compounds and models for ionic bonding in daily life such as salt, baking soda etc.
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describe how a chemical change follows the law of conversation of matter.
Answer: In any chemical change, one or more initial substances change into a different substance or substances.... According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.
Explanation:
List two differences and two similarities between a recipe for baking a cake and a chemical reaction.
The main difference between a recipe for baking a cake and a chemical reaction is that baking a cake is a chemical change whereas a chemical reaction may be a chemical and physical change.
The similarities between a recipe for baking a cake and a chemical reaction is that the molecules react with each other and in both new substances are formed at the end.
How is baking a cake similar to a chemical reaction?
When you bake a cake, the ingredients pass through a chemical change. A chemical change occurs when the molecules are rearranged to form a new substance. When you start baking, you have many ingredients. Baking a cake is a chemical change because the ingredients rearrange to form a new substance which is not reversed. The sugar, flour, and eggs can't be separated from each other. The properties of the materials have changed so it is considered as a chemical change.
So we can conclude that baking a cake and a chemical reaction is different due to the presence of chemical change whereas chemical reactions have both chemical and physical change. The similarity between a recipe for baking a cake and a chemical reaction is that in both new substances are formed at the end.
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