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
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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How could you solve for pH if
the [OH-] concentration is the only value you know? *
Answer:call me 9016914160
Explanation:
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.
A student is given 50.0mL of a solution of Na2CO3 of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0MCa(NO3)2(aq) , causing a precipitate to form. The balanced equation for the reaction is shown below.
Na2CO3(aq)+Ca(NO3)2(aq)→2NaNO3(aq)+CaCO3(s)
(a) Write the net ionic equation for the reaction that occurs when the solutions of Na2CO3 and Ca(NO3)2 are mixed.
Answer:
Ca(aq)⁺² + CO₃⁻²(aq) → CaCO₃(s)
Explanation:
Breaking down the equation into ionic form gives:
2Na⁺(aq) + CO₃⁻²(aq) + Ca⁺²(aq) + 2NO₃⁻¹ (aq) → 2Na⁺(aq) + 2NO₃⁻¹(aq) + CaCO₃(s)
Eliminating all the same ionic states on both sides of the equation gives following final equation
Ca(aq)⁺² + CO₃⁻²(aq) → CaCO₃(s)
Net ionic equation:-
[tex]Ca^{+2}(aq)+ CO_3^{-2}(aq) \rightarrow CaCO_3(s)[/tex]
Given equation:-
[tex]Na_2CO_3(aq)+Ca(NO_3)_2(aq)\rightarrow2NaNO_3(aq)+CaCO_3(s)[/tex]
Breaking down the equation into ionic form gives:
[tex]2Na^{+} (aq) + CO_3^{-2} (aq) + Ca^{2+}(aq) + 2NO_3^{-}(aq) \rightarrow 2Na^{+} (aq) + 2NO_3^{-} + CaCO_3(s)[/tex]
Eliminating all the same ionic states on both sides of the equation gives the equation as follows:-
[tex]CO_3^{-2} (aq) + Ca^{2+}(aq) + \rightarrow CaCO_3(s)[/tex]
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Which three of the five items would be best to include in a safety contract?
In a safety contract, important items to include are rules regarding the use of safety equipment, procedures for handling emergencies, and guidelines for reporting unsafe conditions.
Explanation:When designing a safety contract, it's crucial to include items that promote health and safety. Three items that would be beneficial to include in a safety contract are: Rules regarding the use of safety equipment, Procedures for handling emergencies and Guidelines for reporting unsafe conditions.
Rules regarding the use of safety equipment - This includes knowing when and how to use protective gear like gloves, helmets, eye protection, etc. These rules can prevent accidents and protect individuals from harm.Procedures for handling emergencies - This refers to the appropriate actions to take in case of an emergency. For instance, knowing the location of fire exits, first aid kits, or who to contact during an alarming situation.Guidelines for reporting unsafe conditions - Encouraging individuals to report when they notice anything potentially hazardous can prevent accidents from occurring. It promotes a culture of safety and awareness.Each of these provisions are essential components that strengthen the safety and well-being of all participants involved.
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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.
Identify the product(s) in the chemical equation below. Check all that apply.
Al + 6 HCI - 3 H2 + 2 AICI:
H2
HCI
AI
AICI3
Answer: [tex]AlCl_3[/tex] and [tex]H_2[/tex]
Explanation:
The given balanced chemical equation is :
[tex]2Al+6HCl\rightarrow 3H_2+2AlCl_3[/tex]
In a chemical reaction, the reactants are the substrates which react and are written on the left side of the equation.
The products are the substrates which are formed as a result of the chemical reaction and thus are written on the right side of the equation.
Thus here [tex]AlCl_3[/tex] and [tex]H_2[/tex] are the products.
name the relationship between 3 and 5
The volume of a gas is 27.5 mL at 22.0°C and 0.974 atm. What will the volume be at 15.0°C and 0.993 atm? Use Ideal Gas Law (PV = nRT) to find the appropriate gas law for this problem.
Answer:
26.3 mL
Explanation:
Step 1:
Obtaining an appropriate gas law from the ideal gas equation.
This is illustrated below:
From the ideal gas equation:
PV = nRT
Divide both side by T
PV/T = nR
At this stage, we'll assume the number of mole (n) to be constant.
Note: R is the gas constant.
PV/T = constant.
We can thus, write the above equation as:
P1V1/T1 = P2V2/T2
The above equation is called the general gas equation.
Step 2:
Data obtained from the question. This includes the following:
Initial volume (V1) = 27.5 mL
Initial temperature (T1) = 22.0°C = 22.0°C + 273 = 295K
Initial pressure (P1) = 0.974 atm.
Final temperature (T2) = 15.0°C = 15.0°C + 273 = 288K
Final pressure (P2) = 0.993 atm
Final volume (V2) =..?
Step 3:
Determination of the final volume of the gas using the general gas equation obtained. This is illustrated below:
P1V1 /T1 = P2V2/T2
0.974 x 27.5/295 = 0.993 x V2/288
Cross multiply to express in linear.
295x0.993xV2 = 0.974x27.5x288
Divide both side by 295 x 0.993
V2 = (0.974x27.5x288)/(295x0.993)
V2 = 26.3 mL
Therefore, the new volume of the gas is 26.3 mL
The substances that are present before any chemical reaction are called
Answer:
Reactants
Explanation:
A reactant is a substance that takes part in and undergoes change during a reaction.
What type of bond exists between the atoms in a molecule of N2?
A. Metallic
B. Ionic
C. Covalent
D. Electrostatic
A molecule of N2 features a triple covalent bond, where the nitrogen atoms share three pairs of electrons equally, forming one of the strongest covalent bonds.
Explanation:The bond between the atoms in a molecule of N2 is a covalent bond. This is because the two nitrogen atoms have the same electronegativity and thus share electrons almost equally between them, creating a stable bond. In the case of diatomic nitrogen (N2), the nitrogen atoms form a triple bond, which is one of the strongest covalent bonds, involving the sharing of three pairs of electrons.
When mixing HCl(aq) and NaOH(aq) of the same concentration (1.0 m) to produce 100 mL of product solution what volume ratio produces the largest temperature change
Answer:
See explaination
Explanation:
We have to understand the reason of temperature change , when NaOH reacts with HCl neutralization reaction occurs producing energy. When this released energy is absorbed temperature is increased.
So when 1 mole off NaOH reacts with 1 mole of HCl reacts 57.3 KJ of energy is released .
During a reaction for , when equivalent number of moles reacts higher energy will be produced.
If 80 ml HCl and 20 ml NaOH reacts , then only 20 ml NaOH reacts with 20 ml of HCl and rest 60 ml is not reacting.
But when 60 ml HCl and 40 ml NaOH reacts 40 ml of each are reacting, so energy produced will be higher.
so B > A
For II the observed phenomena is already discussed as higher number of moles of HCl and NaOH reacts so , due to which higher energy is released and thus temperature is higher.
50 ml of each HCl and NaOH produces largest temperature change , as higher number of moles of HCl and NaOH reacts so , due to which higher energy is released and thus temperature is higher.
Can someone post a periodic table with their atomic mass, etc.
Answer:
Look in the image:
Explanation:
If a “sample” of pennies contained 75 heads and 25 tails, how many half‐lives would have passed since the “sample” formed. Explain your answer.
If a “sample” of pennies contained 25 heads and 75 tails, how many half‐lives would have passed since the “sample” formed. Explain your answer.
Please help, our teacher teaches nothing and we get random work with no context! This is the only question our whole (honors) class doesn't understand.
The time taken for the completion of a definite fraction of a reaction is an important characteristic for every reaction and its dependence on initial concentration of the reactant is determined by the order of the reaction. Here the number of half lives is 3.
What is half life period?The half life period of a reaction is defined as the time in which the concentration of a reactant is reduced to half of its initial concentration. It can also be called as the time for the conversion of 50% of a reactant into products.
To calculate how many half lives have passed during the formation of pennies, we have to know about the number of heads and tails in the sample. There are a total of 75 heads and 25 tails present in the sample.
So here the sample has been found to pass through 3 half lives.
Thus the number of half lives passed since the sample is formed is 3.
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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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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
Juan and Jose are having an argument about their science book. Juan says that since the book is sitting still, there are no forces acting on it. Jose says there are forces acting on the book. Which student is correct? Explain why.
The Answer To This Question Will Be :
Jose is correct because there is always a force acting upon something. The book is moving by force but you can't see it. Gravity is pulling the book down, but the desk is holding it up. Equal and opposite
Jose is right, as the book is lying on the table, equal and opposite forces are acting on it.
According to Newton's first law, an object can only move when it is acted upon by unbalanced forces. If a body is acted upon by balanced forces, it does not move.
As the book is lying on the table it is acted upon by two equal and opposite forces, of weight and the reaction. Since the forces are equal and opposite, the book does not move.
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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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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:
A metallurgist reacts 250.0 grams of 76.0% by mass silver nitrate solution with an excess of copper
metal. How many grams of silver metal can the metallurgist produce during the process? (1 point)
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
A. 172 grams
B. 190 grams
C. 121 grams
D. 142 grams
Answer: C. 121
Explanation:
took the test
The mole concept is used here to determine the grams of the silver metal. The mass of silver metal produced by the reaction of 250.0 grams of 76.0% by mass silver nitrate solution with an excess of copper metal is 121 grams. The correct option is C.
What is mole concept?One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon-12. One mole of any substance contains Avogadro number of molecules.
Number of moles (n) = Given mass / Molar mass
The equation for the reaction is;
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
Mass of silver nitrate = 250.0 g × 0.76 = 190 g
Molar mass of silver nitrate = 169.87 g/mol
Moles of silver nitrate = 190 / 169.87 = 1.118 moles
Mole ratio of Silver nitrate to silver metal = 1 : 1
Therefore, moles of silver metal = 1.118 moles
So the mass of silver metal = 1.118 moles × 107.868 g/mol = 120.59 g ≈ 121 g
Thus the correct option is C.
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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✌️
candice is interested in learning more about colors. which question about colors could be answered through scientific investigation?
A) which color bends the most to make a rainbow?
B) which color of scented marker has the best smell?
C) which flower has the prettiest shade of purple on its petals?
D) what is the best looking color on a high performance sports car?
Answer:
A) is ur answer to the question.
Cuz the bending of rainbow light makes a band spectrum of colours. and the colour that bends the most is Violet.
Hope this helps ya
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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What does H—H represent. See attached photo for the options
Answer:
2nd option
Explanation:
Answer:
A. Linear molecule with one domain
It’s stochiemetry questions please help!
?_N2 + _? O2 → _?_ NO2 balance the equation and determine the correct lowest mole ratio.
If 5 moles of N2 reacted with 12 moles O2
How many moles NO2 are produced?
How many moles of O2 are left ? How many moles of N2 are left?
To balance the given equation, the balanced equation is 5[tex]N_2[/tex] + 3[tex]O_2[/tex] → 10[tex]NO_2[/tex]. If 5 moles of [tex]N_2[/tex] reacted, 10 moles of [tex]NO_2[/tex] will be produced. There will be 3 moles of [tex]O_2[/tex] left and 0 moles of [tex]N_2[/tex] left.
To balance the given equation, let's start with nitrogen (N) atoms. There are 2 N atoms on the left side and 2 N atoms on the right side, making it balanced.
Next, let's balance the oxygen (O) atoms. There are 4 O atoms on the left side and 6 O atoms on the right side. To balance it, we need to multiply the [tex]O_2[/tex] on the left side by 3. The balanced equation is:
5[tex]N_2[/tex] + 3[tex]O_2[/tex] → 10[tex]NO_2[/tex]
Now, let's calculate the mole ratio using the coefficients in the balanced equation:
For every 5 moles of [tex]N_2[/tex], we have 10 moles of [tex]NO_2[/tex] produced.
Therefore, if 5 moles of [tex]N_2[/tex] reacted, we will have 10 moles of [tex]NO_2[/tex] produced.
To determine the moles of [tex]O_2[/tex] left, we compare the coefficients of [tex]O_2[/tex] and [tex]NO_2[/tex]. For every 3 moles of [tex]O_2[/tex] consumed, we have 10 moles of [tex]NO_2[/tex] produced. Since only 12 moles of [tex]O_2[/tex] were initially available, 9 moles of [tex]O_2[/tex] will be consumed, leaving 3 moles of [tex]O_2[/tex].
Similarly, to determine the moles of [tex]N_2[/tex] left, we compare the coefficients of [tex]N_2[/tex] and [tex]NO_2[/tex]. For every 5 moles of [tex]N_2[/tex] consumed, we have 10 moles of [tex]NO_2[/tex] produced. Since only 5 moles of [tex]N_2[/tex] were initially available, all of it will be consumed, leaving 0 moles of [tex]N_2[/tex].
Crossword puzzle... would like help pwease ... 8th grade
~Earth Systems and Resources - Properties Of Minerals~
*GIVEING ALOT OF POINTS*
Answer
1: Hardness
2: Metals
3: Mineral
4: Fossil Fuels
5: Ore
6: Color
7: Streak
8: Mohs Scale
9: Crystal
The student's homework question pertains to the topic of 'Earth Systems and Resources', particularly the study of the properties of minerals. These properties include color, streak, luster, hardness, cleavage, fracture, and specific gravity, among others. An understanding of these properties would likely help in solving the crossword puzzle.
Explanation:The subject of your crossword puzzle appears to be related to the topic of Earth Systems and Resources, specifically, the Properties of Minerals. Minerals, which are naturally occurring, inorganic substances, are identified by their specific properties. Some of these properties include color, streak, luster, hardness, cleavage, fracture, and specific gravity. For example, a mineral's streak is the color of the powder left when a mineral is scraped against a hard surface. On the other hand, luster refers to how light is reflected from the mineral's surface - it can be shiny (metallic) or dull (non-metallic).
I would recommend referring to your study materials or textbooks to find specific answers to your crossword puzzle. This is because the specific clues or prompts on the crossword puzzle would guide you towards the pertinent terms or facts from this topic.
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An industrial-strength pipe cleaner has a molarity (M) ) of 7.0 a 0.60 liter container. To be safely used on the pipes in a home, the molarity is decreased to 2.5 M. What is the solution's new volume?
Answer:
1.68L
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Initial Molarity (Mi) = 7M
Initial volume (Vi) 0.6L
Final Molarity (Mf) = 2.5M
Final Volume (Vf) =.?
Step 2:
Determination of the final volume of the solution.
This can be achieved as shown below:
MiVi = MfVf
Divide both side by Mf
Vf = MiVi /Mf
Vf = 7 x 0.6 / 2.5
Vf = 1.68L
Therefore, the new volume of the solution is 1.68L
A speed boat increases its speed from 42m/s to 88m/s in a 4 seconds period. What is the acceleration during this period?
Answer:
Its 11.5 m/s
Explanation:
acceleration =v-u/t
so, 88-42/4 = 46/4 = 11.5 m/s
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.