Answer:
A
Explanation:
describe a discovery or experiment that might have made it easier for people to believe in atoms
The presence of atom or molecules was proven already by scientific experiments by Rutherford, Dalton etc. There is no simple experiment by which we can prove that a substance is made of atoms. But we can observe it using Brownian motion.
What is atomic theories?There are various theories proposed by scientists regarding the structure and properties of atoms and they discovered the presence of sub-atomic particles electrons, protons and neutrons.
The presence of charged particles inside an atom is discovered by Rutherford using Gold-foil experiment. Similarly J.J Thomson discovered the electrons first.
Brownian motion is the random motion of particles which are suspended in a medium of liquid or gas. This motion is a proof of molecular vibration and thereby the presence of atoms or molecules.
By the immersing particle of inorganic matter in water we can observe the Brownian motion easily provided no external force is affected.
Therefore, in fact by these simple observations we can have a believe in atoms.
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What is the molarity of a solution made with 298g of potassium chloride dissolved in enough water to make 2L of solution?
Answer:
2 M
Explanation:
The equation for molarity is "M = moles/liters"
Potassium chloride's atomic mass is 74.55, meaning one mole of KCl is equal to 74.55g. In the equation, 298g of KCl is being used. To find out how many moles this is, multiply 298g of KCl by (1 mol/74.55g of KCl) to get 4.0 moles. Now you can use the equation for molarity.
M = 4.0 moles/2 Liters
The molarity of the solution made by dissolving 298 g of KCl in enough water to make 2 L of the solution is 2 M
We'll begin by calculating the number of mole in 298 g of potassium chloride, KCl. This can be obtained as follow:Mass of KCl = 298 g
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol
Mole of KCl =?Mole = mass / molar mass
Mole of KCl = 298 / 74.5
Mole of KCl = 4 moles Finally, we shall determine molarity of the KCl solution. This can be obtained as follow:Mole of KCl = 4 moles
Volume = 2 L
Molarity of KCl =?Molarity = mole / Volume
Molarity of KCl = 4 / 2
Molarity of KCl = 2 MTherefore, the molarity of the KCl solution is 2 M.
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lilah runs 6m/s . how long will it take her to run 42 meters
Final answer:
Lilah will take 7 seconds to run 42 meters at a speed of 6 meters per second. This is a basic calculation in physics involving speed, distance, and time.
Explanation:
Distance = 42 meters
Speed = 6 m/s
The question about Lilah running 42 meters at 6 meters per second (m/s) is a straightforward physics problem that can be solved by dividing the total distance by the speed.
Therefore,
Time = distance / speed.
= 42/6
= 7
Calculations involving speed, distance, and time are common in many physics problems, whether it's a simple scenario like Lilah's run or a more complex situation such as a marathon runner's speed with uncertainties in distance and time.
What does the half-life of a radioisotope represent?
The half-life of a radioisotope represents the time it takes for half of the atoms in a sample to decay.
Explanation:The half-life of a radioisotope represents the time it takes for half of the atoms in a sample of the radioisotope to decay. It is a measure of the stability of the radioisotope and determines the rate of decay. For example, if the half-life of a radioisotope is 10 days, it means that after 10 days, half of the atoms in the sample would have decayed.
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How are chloroplasts and mitochondria similar in their function for plant and animal cells? What important processes occur in each cell organelle? Why are these processes important?
Answer:
chloroplasts and mitochondria are both organelles that are responsible for energy conversions within the cell. Chloroplasts use sunlight and water and carbon dioxide to produce glucose for plants (photosynthesis). On the other hand, mitochondria break down glucose molecules to produce cell energy in the form of ATP for both plants and animals (cellular respiration).
Explanation:
Photosynthesis and cellular respiration are almost opposite reactions.
Photosynthesis = 6H2O + 6CO2 + sunlight ---> C6H12O2 + O2
Cellular Respiration C6H12O2 + 6O2 --> 6CO2 + 6H2O +ATP
Without photosynthesis plants could not store the energy we use as food and produce oxygen for us
Without cellular respiration we would not be able to obtain energy and give CO2 back to the environment
Final answer:
Chloroplasts and mitochondria are organelles vital for energy conversion in plant and animal cells. Chloroplasts conduct photosynthesis to produce glucose, while mitochondria perform cellular respiration to generate ATP. Both have their own DNA, ribosomes, and double membranes, emphasizing the form follows function principle.
Explanation:
Chloroplasts and mitochondria are similar in their functions for plant and animal cells in that they both are involved in energy conversion processes within the cell. Mitochondria are found in both plant and animal cells and function in cellular respiration, a process that converts glucose and oxygen into ATP, which is the primary energy currency of the cell. Chloroplasts, on the other hand, are found only in plant cells and certain algae and are responsible for photosynthesis, the process that converts carbon dioxide, water, and light energy into glucose and oxygen.
The importance of these processes lies in the fact that photosynthesis provides the glucose that is necessary for cellular respiration. In turn, cellular respiration breaks down glucose to produce ATP, which powers cellular activities. It is this conversion of light energy into chemical energy, and then chemical energy into usable cellular energy, which sustains life in both plant and animal cells.
(04.02 MC)
Which component is missing from the process of photosynthesis?
Carbon Dioxide +
+ Sunlight - Glucose + Oxygen
Light Energy
Sugar
Plants
Water
Answer:
The answer is water .
Explanation:
Water is needed for a plant to photosynthesize .
. Show all of your work. A radioactive cloud may contain Iodine-131, which has a half-life of 8 days. If the waste must decay to a concentration of less than 0.1% to be considered safe, it will take approximately ______ days to reach safe levels.
Answer:
4 days
Explanation:
A radioactive cloud is said Ron contain Iodine-131. It has a half-life of 8 days. If the waste must decay to a concentration of less than 0.1% to be considered safe, then it will take approximately 4 days days to reach safe levels under normal circumstances.
Answer:
100/2 ➙ 50/2 ➙ 25/2 ➙ 12.5/2 ➙ 6.25/2 ➙ 3.13/2 ➙ 1.56/2 ➙ 0.78/2 ➙ 0.39/2 ➙ 0.195/2 ➙ 0.0975
10 half lives x 8 days/half live = 80 days
1,1-Dichloroethane formula
Answer:
C2H4Cl2
Explanation:
This is the formula this might help you.
The formula for 1,1-dichloroethane is C₂H₄Cl₂, where both chlorine atoms are attached to the first carbon of the ethane molecule.
The chemical formula for 1,1-dichloroethane is C₂H₄Cl₂. In organic chemistry, the prefixes indicate the number of substituents and their positions on the carbon chain. The '1,1-' prefix means that both chlorine atoms are attached to the first carbon in the ethane molecule, which has two carbons. In 1,1-dichloroethane, both chlorines are on the same carbon atom.
In the top row labeled Before Collision, the left billiard ball labeled 3 meters per second approaches the right billiard ball labeled 0 meters per second with a grey arrow pointing from the right ball to the left ball. In the bottom row labeled After Collision, the left billiard ball labeled 1 meters per second approaches the right billiard ball labeled 2 meters per second with grey arrows pointing to the right from both balls. Two balls, each with a mass of 0.5 kg, collide on a pool table. Is the law of conservation of momentum satisfied in this collision? Explain why or why not.
Answer:
Sample Response: Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s and the total momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.
Explanation:
Sample Response since i just took it on Edg.
Answer:
Yes
Explanation:
Sample: Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s and the total momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.
Helium decays to form lithium.
6
2
He →
6
3
Li +
0
-1
e
This type of nuclear decay is called .
its B on edge
The nuclear decay of helium into lithium through the emission of an electron is called beta decay. This process changes the composition of the nucleus from helium (^6_2He) to lithium (^6_3Li), while conserving the mass number.
In this process, a neutron within the helium nucleus decays into a proton, electron (specifically, a beta particle), and an antineutrino. Since the number of protons in the nucleus increases from two to three, helium (^6_2He) is transformed into lithium (^6_3Li).
During beta decay, the element ascends one place in the periodic table, even though the mass number (top number) remains the same, as it involves only a change in the type of nucleon (neutron to proton) rather than a loss of nucleons. In this process, the emitted electron (beta particle) is represented by the symbol ^0_-1e, underscoring the fact that it has negligible mass (thus mass number 0) and a negative charge (thus -1).
The relevance of lithium-6 containing three protons, three neutrons, and three electrons is that it represents the lithium formed from the beta decay of helium-6. This lithium isotope, ^6_3Li or Li, is easily ionized due to its electron configuration, which makes lithium a typical alkali metal.
I don’t get how to do it
Answer:
Use the x method, cross over each charge.
Explanation:
[tex]K^{+1}[/tex] and [tex]Br^{-1}[/tex] the +1 and -1 cancel each other out, so it will be KBr
A 4.44 L container holds 0.481 mol of O2 at 22.6 0C. What is the pressure of the tank?
Answer:
2.63 atm.
Explanation:
Given,
Volume,V = 4.44 L
n = 0.481 mol of O₂
Temperature, T = 22.6°C = 22.6 + 273 = 295.6 K
Using ideal gas law
[tex]P = \dfrac{nRT}{V}[/tex]
[tex]P = \dfrac{0.481\times 0.0821 \times 295.6}{4.44}[/tex]
P = 2.63 atm.
Pressure of the tank is equal to 2.63 atm.
Explain the change in mass that occurs when the following substances are separately heated in open crucibles
(a) Copper metal
(b) Copper (II) nitrate
Answer:
your answer is (a) Copper Metal
Explanation:
Copper exists as a chemical element with the symbol Cu and atomic number 29. It exists as a soft, malleable, and ductile metal with very increased thermal and electrical conductivity. A freshly revealed surface of pure copper contains a pinkish-orange color.
Copper(II) nitrate represents any component of the family of inorganic compounds with the formula Cu(NO₃)₂ₓ. The hydrates exist in blue solids. Anhydrous copper nitrate includes blue-green crystals and sublimes in a vacuum at 150-200 °C. Familiar hydrates exist the hemipentahydrate and trihydrate.
Mass exists the quantity of matter in a physical body. It exists even a measure of the body's inertia, the resistance to acceleration (difference of velocity) when a net force exists applied. An object's mass also defines the strength of its gravitational attraction to other bodies.
Mass increase-Copper metals incorporated with oxygen forming copper oxide.Mass reduction-Copper II Nitrate exists deteriorated by heat forming copper oxide, Nitrogen IV Oxide, and oxygen gases, the gases escape.To learn more about Copper refer to:
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50 POINTS!!! Need this for my science class!!!
Answer:
1. A
2. B
3. A
4. C
5. C
6. A
What mass of calcium
chloride will be produced
from 4.09 g of HCI
reacting with Ca(OH),?
123
moles
Answer:
6.22g of CaCl₂
Explanation:
Mass of HCL = 4.09g
Mass of CaCl₂ =
equation of reaction
2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O
From equation of reaction, 2 moles of HCl produces 1 mole of CaCl₂
2(36.5)g of HCl = 111g of CaCl₂
73g of HCl will produce 111g of CaCl₂
4.09g of HCl will produce = x
73g of HCl = 111g of CaCl₂
4.09g of HCl = x
Cross multiply and solve for x
X = (111 * 4.09) / 73
X = 6.219g of CaCl₂ = 6.22g of CaCl₂
4.09g of HCl will produce 6.22g of CaCl₂
1. Explain how you would make 550 ml of a 0.15 M NaOH solution.
an
Add 3.3g of NaOH to 550 mL of water.
How many grams of oxygen are required to produce
9 grams of water at standard conditions?
2 H, + O2 → 2 H2O
grams?
Answer:
8 GRAMS OF OXYGEN WILL BE REQUIRED TO PRODUCE 9 GRAMS OF WATER MOLECULES.
Explanation:
The equation for the reaction is;
2 H + O2 ----> 2 H2O
(H = 1, O = 16)
From the reaction, it can be observed that 1 mole of O2 reacts to form 2 moles of H2O
At STP, using the molar masses of the elememts and compound in the reaction, 32 g of O2 will reacts to form 36 g (18 * 2 g) of H2O
32 g of O2 = 36 g OF H2O
if 9 grams of H2O is produced, the mass of oxygen required to produce it will be:
( 32 * 9 / 36 ) g of O2
= (288 / 36) g
= 8 g of O2
So, 8 grams of Oxygen will be required to produce 9 grams of water.
The chlorination of the iron (III) ion is an endothermic reaction.
Fe^3+(aq) + 2Cl-(aq) ↔ FeCl^2+(aq)
Predict the effect of increasing the reaction temperature.
A) no effect
B) increase in Cl-(aq) concentration
C) increase in Fe3+(aq) concentration
D) increase in FeCl2+(aq) concentration
Answer:
d
Explanation:
The effect of increasing the reaction temperature will increase FeCl₂⁺ (aq) concentration. Therefore, option (D) is correct.
What is the endothermic process?An endothermic process can be defined as any thermodynamic process with an increase in the enthalpy of the system. In such a process, a closed system absorbs thermal energy from its surroundings.
An endothermic reaction will increase the temperature of the system and decrease the temperature of the surroundings. Whether a process can occur depends not only on the enthalpy change but on the entropy change and temperature.
Given, the chlorination of the iron (III) ion can be represented as:
Fe³⁺ (aq) + 2 Cl⁻ (aq) ↔ FeCl₂⁺ (aq)
Given, this reaction is an endothermic reaction, so on increasing the temperature will favor the forward reaction. Therefore, the yield of the product increases FeCl₂⁺(aq) concentration.
Therefore, the increase the concentration of the product in the forward reaction.
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How many moles are there in 2.35 grams of H2O?
Answer:
the answer is 0.13 moles
Final answer:
To find the number of moles in 2.35 grams of H2O, divide the mass by the molar mass of H2O (18.015 g/mol) to get approximately 0.130 moles.
Explanation:
To calculate the number of moles in 2.35 grams of H2O, you need to use the molar mass of water as the conversion factor. The molar mass of water (H2O) is calculated by summing the molar masses of 2 hydrogen atoms (2 x 1.0079 g/mol) and 1 oxygen atom (15.999 g/mol), which equals 18.015 g/mol.
To find the moles of water in 2.35 grams, use the following conversion:
Divide the mass of the H2O by the molar mass:
2.35 g H2O / 18.015 g/mol = 0.130 moles of H2O
Which of the following could be a benefit of climate change?
A. Flooding would increase, bringing water to areas in drought.
B. Bird migration will be altered, changing their nesting patterns.
C. Some crops would be able to grow further north than normal.
D. There will be decreased amounts of snowfall.
Answer:
C
Explanation: Some crops would be able to grow further north than normal.
The following is a benefit of climate change: Some crops would be able to grow further north than normal. The correct option is C.
What is climate change?Climate change is a change or shift in the temperature or pressure of the atmosphere. These changes are long-term and happen due to changes in the habit of humans. Due to the increasing population of humans, they are exploiting natural resources, and due to factories and industries, greenhouse gases are increasing in the environment and increasing the warmth of the earth.
One benefit of the climatic change is that the crops will grow to the north poles due to the warming of the area. North areas are cold and not suitable for growing crops.
Thus, the correct option is C. Some crops would be able to grow further north than normal.
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what is an example of a neutral mutation - ANSWER FAST PLSSSS
choices : a frog born with white skin
a person's inability to break down sugar
a red flower with one part colored yellow
Answer:
a red flower with one part colored yellow
Explanation:
It neither decreases nor increases the chances of survival.
Answer:
c
Explanation:
i took the test
Each of the following statements is about voting trends in recent US elections. Which of the statements is FALSE?
A.
Male citizens are more likely to vote than female citizens.
B.
White citizens are more likely to vote than citizens of other races.
C.
Older citizens are more likely to vote than younger citizens.
D.
Wealthy citizens are more likely to vote than poor citizens
Answer:
I believe it is B
Explanation:
Taken from the California race voting %
Why can't we convert directly from number of particles to grams?
Answer:
particles have mass unique to their substance
Explanation:
for example using cereal ->
1 Frosted mini wheat is much larger than 1 cheerio so it has a higher mass -> They are both single particles but without knowledge of their unique mass we can't convert particle number to grams!
hope this helps !! :)
The reason why it does not convert the direct number of particles to grams is that particles should have mass unique to their substance.
What are particles?A particle represents the tiny piece of matter where the scientist believed that everything that was made in the universe should be of particles. It can be range in terms of size, from larger subatomic particles such as electrons to smaller microscopic particles like atoms or molecules.
Therefore,
The reason why it does not convert the direct number of particles to grams is that particles should have mass unique to their substance.
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What are the top 2 risk Maryland faces due to climate change
Answer:
Maryland is a Mid-Atlantic state in the United States that is characterized by abundant waterways and coastlines.
The effects of climate change in Maryland include rising sea levels, summer heat waves, and more frequent and violent thunderstorms.
These changes affect the citizens of Maryland, their livelihoods and also the economy of the state.
What is the mass of 2.64 moles of water
How many grams of NaOH are produced with the reaction of 5.00 moles of water? *
2Na + 2H20 (arrow) 2NaOH +H2
50g
100g
200g
400g
Answer:
200 grams of NaOH are produced with the reaction of 5.00 moles of water
Explanation:
First of all you apply a rule of three to know the amount of moles of NaOH as follows: if 2 moles of water produce 2 moles of NaOH, 5 moles of water how many moles would they produce?
[tex]moles of NaOH=\frac{5 moles of water*2 moles of NaOH}{2 moles of water}[/tex]
moles of NaOH= 5
Being:
Na: 23 g/moleO: 16 g/moleH: 1 g/molethe molar mass of NaOH is: 23 g/mole + 16 g/mole + 1 g/mole= 40 g/mole
Then a rule of three applies as follows: if in 1 mole there are 40 g of NaOH, in 5 moles how much mass is there?
[tex]mass=\frac{5 moles*40g}{1 mole}[/tex]
mass= 200 g
200 grams of NaOH are produced with the reaction of 5.00 moles of water
Determine the mass of iron heated to 85.0 °C to add to 54.0 grams of ice at 0.0 °C to produce water at 12.5 °C. The specific heat of iron is 0.045 J/g °C.
Answer:
The correct answer is 6.39 kg.
Explanation:
Water is produced at 12.5 degree C, thus, the final temperature is 12.5 degree C.
In the given case, q1 will be the heat required for the conversion of ice to water, and q2 will be the heat required to produced water exhibiting temperature 12.5 degree C.
Thus, on the basis of the formula q1 and q2 are determined,
q1 = ΔHf × m
= 334 J/g × 54 g = 18036 J
q2 = mCΔT
= 54 × 4.184 × 12.5 = 2824.2 J
Hence, the total heat required will be q1 + q2 = 18036 J + 2824.2 J
= 20860.2 K
The mass of iron can be calculated as:
-qmetal = qwater
-m × c × ΔT = 20860.2
-m × 0.045 × (12.5 - 85) = 20860.2
m = 6393 g or 6.39 Kg
the following image shows the same galaxy the Sombrero Galaxy in visible light on the left and an x-ray frequency on the right based on the which of the following statement must be true
Answer:
Dust that blocks visible light is transparent to X-rays.
Explanation:
The bright center of the galaxy can be seen in both images, but the dark ring of dust on the left is absent in the X-ray image on the right. This means that dust that blocks visible light is transparent to X-rays.
Some, but not all, of the bright X-ray sources on the right are also visible on the left. This indicates that bright X-ray sources may be bright visible sources, or they may be very dark according to visible light.
Answer:
dust that blocks visible light is transparent to X-rays
Explanation:
just did the study island
explain how day and night occur
Answer:
Day and night. The Earth is a sphere, or ball, which spins round and round as it travels around the Sun. ... The side facing away is cooler and darker, and experiences night. Because the Earth is constantly spinning, the line between day and night is always moving around the planet.
Explanation:
Answer:
The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not it's orbiting around the sun. The term 'one day is determined by the time the Earth takes to rotate once on its axis and includes both daytime and nighttime.
Explanation:
Which of the following statements about Ideal Gas Law is supported by Charles's Law?
A) An increase in pressure will cause a proportional decrease in volume.
B) If you decrease the temperature of a gas, its volume will decrease proportionally.
C) The total pressure of a gas mixture is the sum of the partial pressure of each gas.
D) At STP, 1 mole occupies 22.4 L.
Answer:
B
Explanation:
volume occupied by fixed amount of gas is directly proportional to its absolute temperature.
Final answer:
The Ideal Gas Law statement corresponding with Charles's Law is that decreasing the temperature of a gas will proportionally decrease its volume, as Charles's Law states that volume and temperature are directly proportional at constant pressure.
Explanation:
The statement about the Ideal Gas Law that is supported by Charles's Law is: B) If you decrease the temperature of a gas, its volume will decrease proportionally. Charles's Law states that the volume of a given amount of gas is directly proportional to its temperature in the Kelvin scale, assuming that the pressure is kept constant. This means that if the temperature of a gas is increased, its volume will increase as well, and conversely, if the temperature decreases, the volume will decrease.