Answer:
D. 1
Explanation:
Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
Answer:
D.1 is the correct answer
Explanation:
__________ What is the value of the activation energy for the forward reaction? Be sure to include the
appropriate sign.
Answer:
+60 kJ
Explanation:
Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ
Use Hess’s Law to calculate the heat of reaction for the following reaction:
A + 3B → 3C + 2D
A + 2B → C + D H= -20 kJ
B → 2C + D H= -45 kJ
Question 10 options:
+25 kJ
-65 kJ
-25 kJ
+65 kJ
Answer:
-65kJ
Explanation:
It is possible to calculate the heat of a reaction by the sum of half-reactions, thus:
(a) A + 2B → C + D ΔH = -20 kJ
(b) B → 2C + D ΔH = -45 kJ
The sum of (a) + (b) gives:
(a) + (b) A + 3B → 3C + 2D ΔH = -20kJ - 45kJ = -65kJ
Thus, heat of reaction is -65kJ
Calculate the concentration of hydroxide ions (OH-) in a solution with a pOH of 2.52?
Answer:
The concentration of hydroxide ions is 3.02*10⁻³ M
Explanation:
The pOH (or OH potential) is a measure of the basicity or alkalinity of a contamination and is defined as the negative logarithm of the activity of the hydroxide ions. That is, the concentration of OH- ions:
pOH= -log [OH-]
The pOH has a value between 0 and 14 in aqueous solution, the solutions with pOH being greater than 7 being acidic, and those with pOH less than 7 being basic.
If pOH= 2.52 then
2.52= -log [OH-]
[OH-]= 3.02*10⁻³ M
The concentration of hydroxide ions is 3.02*10⁻³ M
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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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.
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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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.
FOR 100 PTS
I WILL MARK YOU THE BRAINIEST What is the definition of Convection?
Question 1 options:
When heat transfers through waves.
A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.
When heat transfers from objects that are touching
Heat traveling from the sun.
Answer:
B. A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.
Explanation:
Convection is the movement or transferring of heat in liquids.
Option A shows the definition of Radiation.
Option C shows the definition of Conduction.
Option D shows an example of Radiation.
The only option that shows heat moving in a liquid is option B.
Best of Luck!
I WILL MARK THE BRAINILEST Which object has the most kinetic energy?
Question 3 options:
A car traveling 25 KM/H
A car traveling 10 KM/H
A person running 5 km/h
a bicycle going 10 km/h
Answer:
A car traveling 25 KM/H
Explanation:
It has the largest mass and speed.
Answer: A car traveling 25 KM/H
Explanation: The faster an object is going the more the kinetic energy it's going to have. If there's more force on the object, there's more kinetic energy.
I hope this helps!
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
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.
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
How many mL of 2.0 M KOH are necessary to neutralize 50 mL of 1 M HCl?
Answer:
25mL
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this can help you. Have a nice day!
25 mL of 2.0 M KOH are required to neutralize 50 mL of 1 M HCl due to the 1:1 reaction ratio and molarity calculations.
To determine how many milliliters of 2.0 M KOH are necessary to neutralize 50 mL of 1 M HCl, we first write the balanced chemical equation:
1. KOH(aq) + HCl(aq) → KCl(aq) + H2O(l)
Since the reaction ratio of KOH to HCl is 1:1, we can calculate the moles of HCl and thus the moles of KOH needed for neutralization:
Calculate moles of HCl: 50 mL × 1 M = 50 mmol of HCl
Calculate moles of KOH needed: 50 mmol of HCl × (1 mol KOH / 1 mol HCl) = 50 mmol of KOH
Convert moles of KOH to volume: 50 mmol / 2.0 M = 25 mL of KOH
Therefore, 25 mL of 2.0 M KOH are required to neutralize 50 mL of 1 M HCl.
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:
Determine % yield if a student obtains 45 g of product in an experiment and the theoretical amount is determined to be 50 g. *
Answer:
90%
Explanation:
Percentage yield = ?
Theoretical yield = 50g
Actual yield = 45g
To calculate the percentage yield of a compound, we'll have to use the formula of percentage yield which is the ratio between the actual yield to theoretical multiplied by 100
Percentage yield = (actual yield / theoretical yield) × 100
Percentage yield = (45 / 50) × 100
Percentage yield = 0.9 × 100
Percentage yield = 90%
The percentage yield of the substance is 90%
What type of ion does neutral produces
Answer:
Neutral ions
Explanation:
Because they have a neutral charge They can only produce neutrally.
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
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.
A gas occupies the volume of 215ml at 15C and 86.4kPa?
What is the volume of the gas in STP?
Steps?
Answer:
About 0.1738 liters
Explanation:
Using the formula PV=nRT, where p represents pressure in atmospheres, v represents volume in liters, n represents the number of moles of ideal gas, R represents the ideal gas constant, and T represents the temperature in kelvin, you can solve this problem. But first, you need to convert to the proper units. 215ml=0.215L, 86.4kPa is about 0.8527 atmospheres, and 15C is 288K. Plugging this into the equation, you get:
[tex]0.8527\cdot 0.215=n \cdot 0.0821 \cdot 288\\n\approx 7.754 \cdot 10^{-3}[/tex]
Now that you know the number of moles of gas, you can plug back into the equation with STP conditions:
[tex]1V=7.754 \cdot 10^{-3} \cdot 0.0821 \cdot 273\\V\approx 0.1738L[/tex]
Hope this helps!
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.
Please help me I will name brainliest!
Do you have quantitative data ( numerical results or calculations)? Do you have qualitative data ( written observations and descriptions)? How can you organize this date for your report?
You'll have to record the observations in appropriate ways and organize them The way you collect your data should relate to how you're planning to analyze and use it These might for instance include entering numerical observations into a Qualitative data are collected as descriptions anecdotes opinions quote
Answer:
I was doing this exact thing in school.
Explanation:
Determine the relative formula mass of glucose (C6H12O6) using the periodic table below.
A. 29.1 g/mol
B. 24.0 g/mol
C. 15.0 g/mol
D. 180.1 g/mol
Answer:
D. 180.1 g/mol
Explanation:
Add up each of the masses of the elements in glucose and multiply them by the subscript number.
Carbon: 12.01 * 6 = 72.06
Hydrogen: 1.008 * 12 = 12.096
Oxygen: 16.00 * 6 = 96
72.06 + 12.096 + 96 = 180.156 g/mol ≈ 180.1 g/mol
*Molecular masses vary depending on which measurement / periodic table you use, so expect to be within a range, not exactly the same. My answer was closer to 180.2 g/mol, but it's still acceptable.
Answer:
D. 180.1 g/mol
Explanation:
ed tell chemistry
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
In an exothermic reaction, when heat is added, what way will the reaction shift?
Answer:
The equilibrium will shift to the left.
Explanation:
For an exothermic reaction, heat is a product. Therefore, increasing the temperature will shift the equilibrium to the left, while decreasing the temperature will shift the equilibrium to the right.
A solution with pH of 9.50 has a pOH of?
Answer:4.5
Explanation:
14-9.5
pH can be defined as the degree of how acidic or basic a given solution is. pOH can be defined as the concentration of OH- ions in a given solution.
A solution with a pH of 9.50 has a pOH of 4.5
The formula to solve the above question is given as:
pH + pOH = 14
From the question,
pH = 9.50
Hence, 9.5 + pOH = 14
Subtract 9.5 from both sides
9.5 - 9.5 + pOH = 14 - 9.5
pOH = 14 - 9.5
pOH = 4.5
Therefore, a solution with a pH of 9.50 has a pOH of 4.5
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What is the mass of 2.64 moles of water
The chemical reaction between iron (Fe) and oxygen (O) results in the loss of electrons from iron. This reaction is an example of _____.
A)oxidation
B)respiration
C)combustion
D)sublimation
Your answer is C (i am only writing this part because i dont wanna explain it bla bla bla bla bla bla bla)
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 the main idea and Detail/Evidence of Light microscopes
hi I I don’t know
Explanation:
hi
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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