Answer:
7.737e-9
Explanation:
[H+]=10^-pH
10^-8.76
7.737800829e-9
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
What type of ion does neutral produces
Answer:
Neutral ions
Explanation:
Because they have a neutral charge They can only produce neutrally.
5) Samantha added 125 mL of water to 100mL of a stock solution to make
225 mL of a 0.75 M solution. What was the molarity of the original stock
solution?
O 1.7 M.
O 0.3 M
O 0.75 M
O 3M
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.
How much heat must be removed from 15.5 g of water at 90.0°C to cool it to 43.2°C?
Answer:
Heat, Q = 3035.073 J
Explanation:
It is given that,
Mass of water, m = 15.5 g
Initial temperature, [tex]T_i=90^{\circ} C[/tex]
Final temperature, [tex]T_f=43.2^{\circ}[/tex]
The specific heat of water is, c = 4.184 J/ g°C
The heat removed or absorbed by water is given by formula as :
[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=15.5\times 4.184\times (43.2-90)\\\\Q=-3035.073\ J[/tex]
So, the heat of 3035.073 J is removed from 15.5 g of water.
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
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)
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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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!
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
Explain why copper metal reacts with nitric acid but does not react with hydrochloric acid
Copper metal reacts with nitric acid but does not react with hydrochloric acid due to the difference in reactivity between the two acids. Nitric acid is a strong oxidizing agent, while hydrochloric acid is a weaker acid.
Explanation:Copper metal reacts with nitric acid but does not react with hydrochloric acid due to the difference in reactivity between the two acids. Nitric acid is a strong oxidizing agent, meaning it readily donates oxygen atoms or accepts electrons from other substances. Copper is less reactive compared to hydrogen, so when it reacts with nitric acid, it displaces hydrogen from the acid, resulting in the formation of copper (II) nitrate, nitrogen dioxide, and water.
On the other hand, hydrochloric acid is a weaker acid and does not have strong oxidizing properties like nitric acid. Therefore, copper does not react with hydrochloric acid. Instead, metals like zinc or magnesium, which are more reactive, can react with hydrochloric acid to form hydrogen gas and the corresponding metal chloride.
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:
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
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 is the main idea and Detail/Evidence of Light microscopes
hi I I don’t know
Explanation:
hi
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!
How do our eyes perceive different wavelengths of light?
as ripples
as colors
as dark and light spots
as shades of blue
Answer:
Explanation:
as colors
What does H—H represent. See attached photo for the options
Answer:
2nd option
Explanation:
Answer:
A. Linear molecule with one domain
A solution contains 90 grams of a salt dissolved in 100 grams of water at 40ºC. The solution could be an unsaturated solution of...
A) KCl
B) KNO3
C) NaCl
D) NaNO3
Answer:
D) NaNO₃
Explanation:
In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.
As you can see in the curve attached, let's analize first what is an unsaturated solution.
An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends of the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.
As you can see in the graph attached, what happens to the KCl?, we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.
If you watch NaCl, has a similar behavior. You just need about 35 g of solute to be saturated.
Finally the KNO₃ just need 60 g of solute to be dissolved in solution, completely.
In the case of NaNO₃ we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.
Final answer:
An unsaturated solution is one in which more solute can still be dissolved in the solvent. In this case, the solution contains 90 grams of the salt dissolved in 100 grams of water. However, without knowing the solubility of each salt at 40ºC, we cannot determine which salt could form an unsaturated solution at that temperature.
Explanation:
An unsaturated solution is one in which more solute can still be dissolved in the solvent. In this case, the solution contains 90 grams of the salt dissolved in 100 grams of water. If the solution were saturated, it would contain the maximum amount of solute that can be dissolved at that temperature. Since the solution has less solute than the maximum solubility, it is an unsaturated solution.
To determine which salt it could be, we need to compare the solubility of each salt at 40ºC. Unfortunately, the information provided does not include the solubility data for the salts. Therefore, we cannot determine which salt could form an unsaturated solution at 40ºC based solely on the information given.
Please show your work - thank you! :)
Answer:
A. 4500 mL
Explanation:
We need to use a version of the combined gas law, which states:
[tex]\frac{V_1}{n_1T_1}= \frac{V_2}{n_2T_2}[/tex] , where T represents temperature, V volume, and n moles
First, look at the initial values of n, V, and T:
- n: we have 10.0 grams of hydrogen, which we need to convert to moles. So: [tex]10.0g*\frac{1 mol}{2.02 g} =4.95molH_2[/tex]
- V: we have a volume of 5.0 L
- T: our temperature right now is 28.0°C, but we need it in Kelvins, so add 273: 28.0 + 273 = 301 K
Now look at the final values:
- n: our final number of grams is 8.5 grams of hydrogen, so we need to convert this to moles.
[tex]8.5g*\frac{1 mol}{2.02 g} =4.2molH_2[/tex]
- V: this is what we want to find
- T: our final temperature is 44.0°C; to convert it to Kelvins, add 273.
44.0 + 273 = 317 K
Put this altogether:
[tex]\frac{V_1}{n_1T_1}= \frac{V_2}{n_2T_2}[/tex]
[tex]\frac{5.0}{4.95*301}= \frac{V_2}{4.2*317}[/tex]
Multiply both sides by (4.2 * 317):
[tex]V_2[/tex] ≈ 4.5 L
However, the problem wants millilitres, so simply multiply 4.5 by 1000:
4.5 * 1000 = 4500
The answer is thus A.
Option (A) 4500 ml
Hope it helps✌️
__________ 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
What are three possible sources of groundwater contamination caused by human activity? Describe how these events could happen.
In an ecosystem, possible sources of groundwater contamination caused by human activity are excessive use of fertilizers and chemicals seeping in to the ground.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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For each (P, V) pair, type the pressure in the x-
column and the volume in the y-column. Then click
"Resize window to fit data."
Choose the power regression option. Copy the
equation, using three significant figures, to match
the data.
v=
PM
7
Answer:
using three significant figures, to match the data
v = 51.4
p = -0.999
Using three significant figures, to match the data, v = 51.4 and p = -0.999.
What is Power Regression?
If a variable increases by a fixed amount over an equal amount of time, it will grow linearly. Real-world problems frequently show nonlinear progression.
The exponential function and the power function are two other functions that can model data. If a fixed number higher than 1 is multiplied by a variable in equal intervals, the variable will expand exponentially.
A power regression is one in which the explanatory variable is increased to a power and the response variable is proportionate to it.
We can build the models similarly because exponents are used in both the exponential form and the power form. The log from both sides is first taken.
Therefore, Using three significant figures, to match the data, v = 51.4 and p = -0.999.
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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!
how many moles of oxygen are produced by the decomposition of six moles of potassium chlorate
Answer:
The balanced hemical equation is given below. 18 moles of oxygen are produced.
When 2 moles of Potassium chlorate decomposes to produce 2 moles of potassium chloride and 3 moles of oxygen gas. The balanced chemical equation for this decomposition reaction follows:
By Stoichiometry of the reaction,
2 moles of potassium chlorate produces 3 moles of oxygen gas
So, 12 moles of potassium chlorate will produce = of oxygen gas.
Hence, 18 moles of oxygen gas will be produced.
planation:
Which of the following would most likely act as a Bronsted-Lowry acid?
OH-
HCN
CC14
Mg(OH)+
HCN would most likely act as a Bronsted-Lowry acid. Hence option B is correct.
What is Bronsted-Lowry acid ?The Bronsted-Lowry hypothesis (Proton theory of acid and base) is an acid-base reaction theory proposed in 1923 by a chemist Johannes Nicolaus Bronsted and English chemist Thomas Martin Lowry. According to the hypothesis, acid and base react with each other and generate conjugate bases and conjugated acids through proton exchange.
The Bronsted-Lowry theory is an enhanced version of the Arrhenius acid-base theory.
According to the Arrhenius hypothesis, acid increases the concentration of H+ ions in aqueous solution whereas base increases the concentration of OH- ions. The Arrhenius theory has a restriction in that it only detects the interaction of an acid and a base in an aqueous medium.
Hence option B is correct.
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Can someone post a periodic table with their atomic mass, etc.
Answer:
Look in the image:
Explanation:
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.
Which long-term environmental change could allow some organisms to flourish?
Answer:
ice age
Explanation:
An ice age is a long-term environmental change that could allow some organisms to flourish.
What are ice ages?An ice age is a long period of decrease meant in the temperature of the Earth's surface and atmosphere, producing the presence or expansion of continental and polar ice sheets and alpine glaciers.
Earth's climate alternates between ice ages and greenhouse periods, in which there are no glaciers on the planet.
Sustainability is co-related with the processes of recycling, reorganizing, and rearranging the world around us, Nature and society's relationship, and the way we live and care about it, including our education and environment.
The statement is a definition of what sustainability means because it speaks of a capacity to survive, flourish, and adapt and noticed how the world has changed and the future is all about changing, even more, that is, the world will need to be sustainable to survive.
Hence, an ice age is a long-term environmental change that could allow some organisms to flourish.
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