Acceleration is the change in distance over time.
Please select the best answer from the choices provided
O T
O F
Answers
Answer:
False
Explanation:
Acceleration is the rate of change of velocity with respect to time, not the change in distance over time. In other words, acceleration measures how quickly an object's velocity is changing, whether it's speeding up, slowing down, or changing direction. The formula for acceleration is a = (v_f - v_i) / t, where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time.
Related Questions
Choose one example and describe the appearance of the adult and their young?
Answers
Nuclear fission occurs when _______________ a. TNT and plutonium are combined, causing the molecules to separate. b. a nucleus breaks up into two equal fragments that release and separate more atoms. c. like atoms collide to create double nuclei. d. trinitite is created by multiple molecules that form a single atom.
Answers
Nuclear fission occurs when a nucleus breaks up into two equal fragments that release and separate more atoms. So, the correct option is B.
Nuclear fission is a process in which the nucleus of an atom breaks apart into two or more smaller nuclei. This process releases a significant amount of energy.
Option B accurately describes the process of nuclear fission. When a heavy nucleus, such as uranium-235 or plutonium-239, absorbs a neutron, it becomes unstable and splits into two smaller nuclei.These smaller nuclei, along with additional neutrons, are released in the process. The release of neutrons can trigger a chain reaction, where each neutron released can potentially collide with other nuclei, causing them to undergo fission as well.The energy released during nuclear fission is due to the conversion of a small amount of mass into a large amount of energy, as described by Einstein's famous equation, E=mc².This energy is utilized in various applications, including nuclear power generation and nuclear weapons. Nuclear fission reactions are carefully controlled in nuclear power plants to ensure the sustained release of energy without leading to uncontrolled chain reactions. Hence the correct option is B.
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Why the colloid can't be filitred?Write it's 4 examples.
Answers
Answer:
Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.
ex- cheese, milk, aerosol spray, mayonnaise
5 Daniel has dropped two glass jars containing sugar
and salt as he tried to get them down from the
kitchen cupboard. He now has a mixture of glass,
sugar and salt. Describe in detail how he could
separate the three substances. Sugar and salt are
both soluble in water, but only sugar is soluble in
ethanol (remember that ethanol is flammable and
should not be heated directly).
Answers
Answer:
He could separate the mixture through filtration and fractional crystallization. Ethanol can also be added in order to remove salt.
Solid copper is burned in oxygen gas to make solid copper (ii) oxide
Answers
Answer:
The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.
Explanation:
True or false; A solution always contains only one solvent.
Answers
A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true
What volume (in mL) of 0.750 M sodium hydroxide is needed to neutralize (react with) 275 ml of 0.500 M sulfuric acid (H2SO4)? Write your answer with the proper number of sig figs. Balance the equation first.Your answer will be in mL
NaOH + H2SO4 -> H2O + Na2SO4
I need workkkk
Answers
_ we have C[NaOH]= 0.750M, V[H2SO4]=250ml, C[H2SO4]=0.500M
_ n[H2SO4]= c.v = 0.500x250=125mol
So n[NaOH]= 2n[H2SO4]
= 2x125mol=250mol
So V[NaOH]= n/c = 250ml/0.750M= 333.33ml
Explain how electron microscopy and scanning tunneling microscopes have contributed to the understanding of atoms.
Answers
Answer:
Electron microscopy and scanning tunneling microscopes contributed to the understanding of atoms in understanding atomic structure.
The electron microscope has magnifications of about 100,000x.
This helped the scientists to have accurate image groupings of the atoms. Scanning tunnel microscope helped scientists to have the images of groups of atoms.
A reaction has an enthalpy change of − 71 kJ mol − 1 and an entropy change of − 58 J K − 1 mol − 1 . At what temperature does this exothermic reaction cease to be spontaneous?
Answers
To determine the temperature at which an exothermic reaction ceases to be spontaneous, we need to calculate the Gibbs free energy change (ΔG) and use the equation ΔG = ΔH - TΔS.
Given that ΔH = -71 kJ/mol and ΔS = -58 J/K·mol, we can calculate ΔG at different temperatures to determine the temperature at which the reaction becomes non-spontaneous.
At a temperature of 0 K, ΔG = ΔH, since TΔS = 0. Thus, ΔG = -71 kJ/mol.
As the temperature increases, TΔS becomes more negative, which means that ΔG becomes more negative, making the reaction more spontaneous.
At a certain temperature, however, ΔG will become positive, which means that the reaction is no longer spontaneous and will not proceed on its own. This temperature can be found by rearranging the equation ΔG = ΔH - TΔS to T = ΔH / ΔS, and substituting the known values for ΔH and ΔS:
T = ΔH / ΔS = -71 kJ/mol / (-58 J/K·mol) = 1230 K
So, the reaction will cease to be spontaneous at a temperature of approximately 1230 K.
Which of these materials are magnetic lead Kobalt or gold
Answers
Answer: Cobalt
Explanation:
Lead and gold aren't magnetic
An ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. Help me! This is 8th grade sci btw.
Answers
Complete question:
A ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. What is the gravitational potential energy of the ball ?
Help me! This is 8th grade sci btw
Answer:
the gravitational potential energy of the ball is is 14.7 J.
Explanation:
mass of the ball, m = 0.5 kg
height above the ground on which the ball is sitting, h = 3 m
The gravitational potential energy of the ball is calculated as follows;
P.E = mgh
P.E = 0.5 x 9.8 x 3
P.E = 14.7 J
Therefore, the gravitational potential energy of the ball is is 14.7 J.
Ammonia gas and water (H20) reaction to form household ammonia, which contains NH4 and OH ions. What is the formula for ammonia gas? Name the elements in the compound. In what ratio are they presented
Answers
Answer:
NH3
Explanation:
The formula for ammonia gas is NH3. Its appearance is a colorless gas.
Ammonia gas is formed by the balanced chemical reaction between nitrogen and hydrogen elements. The balanced chemical equation for the formation of ammonia gas is as follows:
N2+3H => 2NH3
So, Nitrogen and Hydrogen are present in the ration of 2:6 or 1:3.
Answer:
lol
Explanation: lol
which is a stronger acid nh3nh3 or ph3ph3 ?
Answers
The stronger acid between NH₃ and PH₃ is PH₃.
In terms of acidity, NH₃ (ammonia) is a weaker acid than PH₃ (phosphine). This is because PH₃ has a stronger acid dissociation constant (Ka) compared to NH₃.
The acidity of a compound is determined by the ability of the molecule to donate a proton (H⁺ ion) to a base. When an acid donates a proton, it forms a conjugate base. The strength of an acid is determined by the equilibrium constant for the dissociation of the acid, which is expressed as the acid dissociation constant (Ka). The higher the value of Ka, the stronger the acid.
In the case of NH₃, it has a Ka value of 5.7 × 10⁻¹⁰, which means it is a weak acid. This is because the nitrogen atom in NH3 is highly electronegative and tends to hold onto the lone pair of electrons, making it less likely to donate a proton.
On the other hand, PH₃ has a Ka value of 4.5 × 10⁻⁹, which means it is a stronger acid compared to NH₃. This is because the phosphorus atom in PH₃ is less electronegative and has a larger atomic radius, making it easier to donate a proton.
In summary, PH₃ is a stronger acid than NH₃ due to its higher Ka value, which indicates that it is more likely to donate a proton to a base.
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How do scientists write very large numbers?
O A. They divide all numbers by a constant to reduce the size.
O B. They round off all numbers to a few digits after the decimal.
O c. They simplify the numbers by deleting the exponents.
D. They express the numbers using scientific notation.
SUBMIT
Answers
Answer: its D
Explanation: i just got the question right
In scientific notation, often known as power-of-10 notation, extremely big and small numbers are written. Scientists write very large numbers by express the numbers using scientific notation.
What is scientific notation ?Numbers that are either too large or too little to be readily stated in decimal form can be expressed using scientific notation. It is also known as standard form in the UK and scientific form, standard index form, and standard form.
The main goal of scientific notation is to simplify computations using numbers that are abnormally big or tiny. The following examples demonstrate how all the digits in a number in scientific notation are relevant, since zeros are no longer utilized to set the decimal point.
When working with very big or very small numbers, scientists, mathematicians, and engineers employ scientific notation. Large and tiny numbers can be represented in a form that is simpler to read using exponential notation.
Thus, option D is correct.
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Just need question 3 answered!!
Answers
Answer:
C
Explanation:
There are 5 valence electrons
Answer:
5
Explanation:
simply add exponents of the highest energy level (the big number in the front says what energy level it is in)
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
1 2 3 4 5 6 7 8 9 10TIME REMAINING53:56A scientist told his student assistants that he had sorted groups of mice by their intelligence and asked the assistants to assess the groups’ maze-solving abilities. The scientist had not actually sorted the mice by intelligence. The students rated the ""highest intelligence"" group of mice as the best maze solvers and the ""lowest intelligence"" group as the worst maze solvers. What was the scientist trying to demonstrate by doing this experiment?Experimental subjects should never be put into groups.Mice should not be judged by their intelligence.Higher intelligence mice are better maze solvers.People can introduce their own biases into an experiment.
Answers
Answer:
People can introduce their own biases into an experiment.
Explanation:
Determine whether each of the following statements about rain or acid rain is true or false. There is more acid rain in the Western vs. Eastern United States. Unpolluted rain water is acidic and approximately 3.6 on the pH scale. Sulfur oxides and nitrogen oxides in the troposphere cause acid rain.
Answers
To determine whether each statement about rain or acid rain is true or false. Please find the evaluation of each statement below:
1. There is more acid rain in the Western vs. Eastern United States.
False. There is more acid rain in the Eastern United States due to higher concentrations of sulfur oxides and nitrogen oxides from industrial activities and power plants.
2. Unpolluted rain water is acidic and approximately 3.6 on the pH scale.
False. Unpolluted rainwater is slightly acidic with a pH of around 5.6. This is due to the natural presence of carbon dioxide in the atmosphere, which dissolves into water and forms carbonic acid.
3. Sulfur oxides and nitrogen oxides in the troposphere cause acid rain.
True. Sulfur oxides (SOx) and nitrogen oxides (NOx) are released from various sources like industrial processes, power plants, and vehicle emissions. These gases react with water, oxygen, and other substances in the troposphere to form sulfuric acid and nitric acid, which then fall to the earth as acid rain.
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Write a detailed method for conducting an investigation on surface area. The aim of the investigation is to investigate whether increasing the surface area of calcium carbonate will result in an increase rate of reaction with Hydrochloric Acid. Independent variable is surface area of quikeze. The thing I am going to change is changing surface area by breaking up the tablet into different sizes. The range is whole tablet, 1/2 tablet and 1/4 tablet. The dependent variable is time it takes to react. The thing I am going to measure is how long the experiment takes to occur. I will measure it by a stopwatch. Write down your step by step instructions of how you will do your experiment.
Answers
Explanation:
Here is a step-by-step method for conducting an investigation on the effect of surface area on the rate of reaction between calcium carbonate and hydrochloric acid:
Materials:
Calcium carbonate tablets (quikeze)
Hydrochloric acid solution (0.5M)
Stopwatch
Safety goggles
Measuring cylinder
Beaker
Spatula
Mortar and pestle
Procedure:
Put on safety goggles.
Measure 50 mL of 0.5 M hydrochloric acid solution using a measuring cylinder and pour it into a beaker.
Crush the calcium carbonate tablet into three different sizes (whole tablet, 1/2 tablet, and 1/4 tablet) using a mortar and pestle.
Use a spatula to transfer the different sizes of calcium carbonate tablets into separate beakers.
Start the stopwatch.
Pour the hydrochloric acid solution into each beaker containing the different sizes of calcium carbonate tablets simultaneously.
Observe and record the time it takes for the reaction to finish in each beaker, i.e., when the fizzing stops.
Repeat the experiment two more times to get more accurate results.
Record the data in a table.
Calculate the average time it takes for the reaction to finish for each different size of calcium carbonate tablet.
Plot a graph of the average time taken for the reaction against the surface area of the calcium carbonate tablets.
Analyze the data and draw a conclusion regarding the effect of surface area on the rate of reaction between calcium carbonate and hydrochloric acid.
Tips for accuracy and safety:
Use the same volume of hydrochloric acid solution in each experiment.
Make sure to crush the different sizes of calcium carbonate tablets into as equal pieces as possible.
Repeat the experiment multiple times to reduce any errors in measurement.
Always wear safety goggles to protect your eyes from the hydrochloric acid solution.
Dispose of the leftover chemicals properly according to your lab's regulations.
Which is composed of aromatic hydrocarbons?clothingbarbeque fuelpain relieverspolyvinyl chloride
Answers
Aromatic hydrocarbons are organic compounds that contain one or more benzene rings in their structure. These compounds are characterized by their strong, pleasant odor, which is why they are called aromatic. They are commonly found in petroleum products and are often used as feedstock for the production of chemicals and fuels.
Out of the options given, clothing and polyvinyl chloride do not contain aromatic hydrocarbons. On the other hand, barbecue fuel and pain relievers can contain aromatic hydrocarbons.
Barbecue fuel, also known as charcoal briquettes, is made from compressed charcoal dust mixed with a binding agent. The charcoal is made by heating wood in the absence of oxygen to remove the moisture and other impurities. The resulting charcoal contains a high concentration of aromatic hydrocarbons, which gives it its characteristic smell and helps it burn efficiently.
Pain relievers, such as aspirin and ibuprofen, are also known to contain aromatic hydrocarbons. These compounds are used in the synthesis of these drugs as intermediates, and traces of them can be present in the final product. However, the levels are generally low and not considered harmful to health.
In summary, barbecue fuel and pain relievers can contain aromatic hydrocarbons, while clothing and polyvinyl chloride do not. It is important to note that exposure to high levels of these compounds can be harmful to health, and precautions should be taken to minimize exposure.
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Answer: b
Explanation: because i just took the quiz
The half-life of nitrogen-16 is approximately 7.13 seconds. Step 2 of 3 : How much of a 3 gram sample of nitrogen-16 would remain after 8 seconds
Answers
After 8 seconds, approximately 0.375 grams of a 3 gram sample of nitrogen-16 would remain.
The half-life of nitrogen-16 is approximately 7.13 seconds, which means that after each half-life, half of the original sample decays. To calculate the amount remaining after 8 seconds, we can divide the elapsed time (8 seconds) by the half-life (7.13 seconds). This gives us approximately 1.12 half-lives.
Each half-life reduces the sample by half, so we can calculate the remaining amount by multiplying the original sample mass (3 grams) by 0.5 raised to the power of the number of half-lives. In this case, 0.5^1.12 is approximately 0.375. Therefore, after 8 seconds, around 0.375 grams of the original 3 gram sample of nitrogen-16 would remain.
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Which of the following can behave as Bronsted-Lowry acids in aqueous solution?
a. HNO3
b. NH4+
c. Br-
d. KOH
e. None of the Above
Answers
The following substances can behave as Bronsted-Lowry acids in aqueous solution: HNO₃ and NH₄+
The correct answer is a and b.
The Bronsted-Lowry acid theory is a chemical theory that explains acids and bases and their reactions. It defines acids as proton donors and bases as proton acceptors.
According to the definition provided by Bronsted–Lowry, an acid is a proton (H+) donor, while a base is a proton acceptor. At the point when a Brønsted-Lowry corrosive loses a proton, a form base is shaped. Similarly, a conjugate acid is produced when a Bronsted–Lowry base acquires a proton.
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copper oxide + hydrochloric acid →
Answers
Answer:
copper oxide + hydrochloric acid --> copper chloride + water
Explanation:
Thenks and mark me brainliest :))
Answer:
Copper oxide hydrochloric acid ( CuCl2 + H2O)
Explanation:
CuO + HCl → CuCl2 + H2O
what does the charge on the electron cloud do
Answers
Answer:
Explanation: Of course the negative charge of the electron cloud is balanced by the positive charge of the atomic nucleus for neutral molecules. ... If we were doing this again today, we would designate the electronic charge as positive (and of course the nuclear charge would thus be NEGATIVE!)
Explanation:
What does net force depend on
Answers
Answer:
net force depends upon the object and also the mass of that object
Answer:The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
Explanation:
Part E
Study the trend of the graph from part C. What would the reaction time be (in seconds) if the water were cooled to
5°C?
Answers
According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.
What would the reaction time be if the water were cooled to 5°C?To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.
In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.
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What mass of silver can be plated onto an object in 33. 5 minutes at 8. 70 A of current? Ag (aq) e- → Ag(s).
Answers
Answer:
need points sorry
Explanation:
Reaction of 3-methyl-1-butene with CH3OH in the presence of H2SO4 catalyst yields 2-methoxy-2-methylbutane by a mechanism analogous to that of acid-catalyzed alkene hydration Draw curved arrows to show the movement of electrons in this step of the reaction mechanism Arrow-pushing Instructions Ht Submit Answer Try Another Version 3 item attempts remaining
Answers
The reaction of 3-methyl-1-butene with CH3OH in the presence of H2SO4 catalyst yields 2-methoxy-2-methylbutane.
In the first step of the reaction mechanism, the acid-catalyzed hydration of the alkene occurs. The presence of the H2SO4 catalyst helps in protonating the alkene, generating a more electrophilic carbocation intermediate. The curved arrows illustrate the movement of electrons during this step.
The mechanism begins with the protonation of the alkene by a proton (H+) from the H2SO4 catalyst. The curved arrow starts from the lone pair of electrons on the oxygen of the sulfuric acid (H2SO4) and points towards the carbon atom that is doubly bonded to the methyl group in 3-methyl-1-butene. This protonation creates a positively charged carbocation intermediate.
Next, the methanol (CH3OH) acts as a nucleophile, with the lone pair of electrons on the oxygen attacking the positively charged carbon atom of the carbocation. The curved arrow starts from the lone pair of electrons on the oxygen of methanol and points towards the positively charged carbon atom of the carbocation. This nucleophilic attack forms a new bond between the carbon and the oxygen of methanol.
The final product is 2-methoxy-2-methylbutane, where the methoxy group (CH3O-) is attached to the second carbon of the butane chain. The reaction has resulted in the addition of a methoxy group to the original alkene, forming a new carbon-oxygen bond.
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hello people ~
Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
Answers
Answer:
Explanation:
The volume of Hydrogen and Oxygen molecules are not the same but assuming that they are, the ratio in water which is H2O would be
(c) 2:1
consider the reaction represented by the following equation: 2na cl2->2nacl. how many moles of nacl can be produced from 2 mol of cl2 and excess na, assuming a complete reaction?
Answers
According to the balanced equation, 2 mol of Cl2 react with 2 mol of Na to produce 2 mol of NaCl. Therefore, if 2 mol of Cl2 are present in excess Na, then 2 mol of NaCl can be produced.
4 moles of NaCl can be produced from 2 moles of Cl2 and excess Na, assuming a complete reaction.2 mol of Cl2 react with 2 mol of Na to produce 2 mol of NaCl. Therefore, if 2 mol of Cl2 are present in excess Na, then 2 mol of NaCl can be produced. In the given reaction, 2Na + Cl2 -> 2NaCl, the balanced equation shows that 1 mole of Cl2 reacts with 2 moles of Na to produce 2 moles of NaCl. Since you have 2 moles of Cl2 and excess Na available, the complete reaction will produce 2 x 2 = 4 moles of NaCl. Therefore, 4 moles of NaCl can be produced from 2 moles of Cl2 and excess Na, assuming a complete reaction.
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