Answer:
Evaporation is the main way water enters the atmosphere.
Explanation:
Evaporation is the main way moisture enters the atmosphere. The amount of evaporation is not the same all of the world. Most evaporation happens over large bodies of water, like oceans and seas. Very little evaporation happens in dry areas, such as deserts. The amount of water on earth is constant. This means it does not change.
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
Can someone post a periodic table with their atomic mass, etc.
Answer:
Look in the image:
Explanation:
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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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
How could you solve for pH if
the [OH-] concentration is the only value you know? *
Answer:call me 9016914160
Explanation:
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.
Which statement about ionic bonds is true?
A. Ionic bonds occur between non-metals.
B. Ionic bonds occur between two metals.
C. In ionic bonds one atom accepts electrons from another atom to achieve a stable outer shell.
D. In ionic bonds atoms share electrons to achieve a stable outer shell.
Answer:
C. In ionic bonds one atom accepts electrons from another atom to achieve a stable outer shell.
Explanation: Some Atoms have positive Charges. Like Na (Sodium) has a charge of +1 because its missing an electron, and there are Atoms with a negative charge like Chlorine, it has an extra electron so a charge of -1. The chlorine atom transfers the extra Electron to the sodium atom. they both gain a neutral Charge.
In ionic bonds, one atom accepts electrons from another atom to achieve a stable outer shell. Hence, option C is correct.
What is an ionic bond?An ionic bond is formed by the complete transfer of some electrons from one atom to another.
Some Atoms have positive Charges. Like Na (Sodium) has a charge of +1 because it's missing an electron, and there are atoms with a negative charge like Chlorine, it has an extra electron so a charge of -1.
The chlorine atom transfers the extra electron to the sodium atom. they both gain a neutral Charge.
Hence, option C is correct.
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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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What is the molality of a solution in which 55g of sucrose are dissolved in 950mL of water?
The molality of a solution with 55g of sucrose dissolved in 950mL of water is 0.1692 mol/kg, calculated by dividing the moles of sucrose by the kilograms of water.
Explanation:To calculate the molality of a solution in which 55g of sucrose are dissolved in 950mL of water, we first need to find the number of moles of sucrose and the mass of the solvent (water) in kilograms.
The molar mass of sucrose (C₁₂H₂₂O₁₁) is approximately 342.3 g/mol. 55 grams of sucrose is therefore 55 g / 342.3 g/mol = 0.1607 mol. Since density of water is approximately 1 g/mL, 950 mL of water weighs 950 g, which is the same as 0.950 kg.
The molality (m) is then calculated using the formula m = mol solute/kg solvent. Substituting the values we have, 0.1607 mol/0.950 kg = 0.1692 mol/kg. So, the molality of the solution is 0.1692 m.
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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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
name the relationship between 3 and 5
What mass of sodium sulfate is needed to make 2.5 L of 2.0 M solution?
A 120 g
B 150 g
C 180 g
D 710 9
E 750 g
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.
?_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].
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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Which statement correctly describes the location and charge of the protons in an atom?
Answer:
Protons are located in the nucleus and have a positive charge and a mass of 1.
Explanation:
Know about protons, neutrons, and electrons.
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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A family has a furnace that uses natural gas to heat their home. They are moving to an area that offers the option of using energy from a solar power plant to heat their home. Which disadvantage will the family most likely face by making this switch?
a less reliable production of heat
higher costs for the monthly heating bill
an increase in waste production
smaller quantities of heat
The family is most likely to face higher costs for the monthly heating bill by switching to energy from a solar power plant. Although solar power is a renewable and clean energy source, the initial installation and maintenance costs of solar panels can be expensive, resulting in higher monthly bills compared to using natural gas.
Explanation:Solar power harnesses energy from the sun's radiation to generate electricity or heat. Photovoltaic cells convert sunlight into electricity, while solar thermal systems use sunlight to produce steam for electricity generation or provide direct heating. Solar power is a sustainable and renewable energy source with minimal environmental impact.
The family is most likely to face higher costs for the monthly heating bill by switching to energy from a solar power plant. Although solar power is a renewable and clean energy source, the initial installation and maintenance costs of solar panels can be expensive, which can result in higher monthly bills compared to using natural gas. Additionally, the family may also face limitations in the amount of heat produced as solar power can be dependent on weather conditions.
Early in the earth’s history there was little to no oxygen into atmosphere. How did oxygen levels in the atmosphere reach current levels?
Final answer:
Earth's atmosphere contained little free oxygen until cyanobacteria’s photosynthesis began producing oxygen, which accumulated over time due to geological activities that limited oxygen's recombination with organic matter. The rise in oxygen levels led to the creation of the ozone layer, allowing life to thrive on land.
Explanation:
Initially, Earth's early atmosphere contained little to no free oxygen. This was because oxygen is a byproduct of photosynthesis, a process that was not prevalent until the evolution of photosynthetic organisms like cyanobacteria. Over time, as more plants appeared and photosynthesis increased, more oxygen was produced. However, the oxygen was quickly removed from the atmosphere through chemical reactions with the Earth's crust, preventing it from accumulating. This changed around 2.4 billion years ago, when geological activity increased and plants were buried before they could decompose fully, which decreased the removal of oxygen and allowed it to begin accumulating in the atmosphere.
The buildup of oxygen in the atmosphere had significant evolutionary consequences. The emergence of the ozone layer, comprised of three oxygen molecules (O3), protected life from the Sun's ultraviolet radiation, enabling the colonization of land. Thus, the oxygenation of the atmosphere facilitated the development of aerobic life and the complex biodiversity we have today.
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.
How does temperature affect magnetism
It’s stochiemetry questions please help!
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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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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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
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.
What does H—H represent. See attached photo for the options
Answer:
2nd option
Explanation:
Answer:
A. Linear molecule with one domain
The empirical formula is:
A. the actual number of atoms of each element in a molecule.
B. All of these
C. the relative number of atoms of each element, using the lowest whole ratio.
D. representation of a compound that shows how its atoms are arranged
Answer:
C. the relative number of atoms of each element, using the lowest whole ratio.
Explanation:
The empirical formula is how we simplify the whole formula to simplify it to its smallest indivisible parts.
It is definitely not the actual number of atoms. If you see an empirical formula, don't think that it's the full thing.
It is also not a representation of a compound to show its atoms' arrangement: this would be a Lewis dot structure, or a ball and stick model, or something similar. We don't use the empirical formula for this purpose.
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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