Answers
Answer:
The mass percentage of chlorine is 60.66 % chlorine in the compound sodium chloride.
Explanation:
Related Questions
Which 3 organisms feed on dead matter and waste products?
Earthworm
Ladybug
Fungi
Mice
Bacteria
Answers
Answer:
mice
bacteria
fungi
Explanation:
that's the answer
TIMED PLS HELP AND WILL GIVE BRAINLIST
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answers
Answer:
19.4 g of alum, will be its theoretical yield
Explanation:
The reaction is:
2 Al + 2 KOH + 4 H₂SO₄ + 22H₂O → 3H₂ + 2KAl(SO₄)₂•12H₂O
Let's determine the amount of acid.
M are the moles contained in 1 L of solution or it can be mmoles that are contained in 1 mL of solution
M = mmol /mL
M . mL = mmol
We replace: 8.3 mL . 9.9 M = 82.17 mmoles
We convert to moles: 82.17 mmol . 1 mol / 1000mmol = 0.082 moles
Ratio is 4:2
4 moles of sulfuric acid can make 2 moles of alum
By the way, 0.082 moles of acid may produce ( 0.082 . 2) /4 = 0.041085 moles.
We convert moles to mass:
Molar mass of alum is: 473.52 g/mol.
0.041085 moles . 473.52 g/mol = 19.4 g
A 217.6 sample of gas is collected at 9.011 atm and 127.8°C. What volume does the gas have at 44.9 atm and 11.9 °C?M
Answers
Answer:
The correct answer is = 31.04
Explanation:
The relation between volume, temperature and pressure of a fix amount of a gas can be expressed by the combined gas law:
PV/T = k
It can be written as well as
P1V1/T1 = P2V2/T2
Given:
V1 = 217.6
P1 = 9.011 atm
T1 = 127.8°C = 400.95 K
P2 = 44.9
T2 = 11.9 °C = 285.05
Solution:
Putting value in the formula
V2 = P1V1T2/P2T1
= (217.6*285.05*9.011)/44.9*400.95
V2 = 31.04
Please answer. Brainliest!
Answers
Answer:
the equation is balanced
Explanation:
the equation is balanced
Explanation:
the equation is blanced
Match each word to its correct meaning. 1. carbon sequestration carbon dioxide, water vapor, methane, nitrogen oxides, and some CFCs that absorb heat and keep it in the earth's atmosphere 2. greenhouse effect technology used to capture the carbon released from smokestacks and store it in some part of the environment to keep it out of the atmosphere 3. greenhouse gas a term used to describe the role that greenhouse gases play in keeping the earth warm
Answers
Answer:
1. Greenhouse gas.
2. Carbon sequestration.
3. Greenhouse effect.
Explanation:
Greenhouse gases can be defined as gases that trap heat within the Earth's atmosphere. Thus, an increase in global temperature is largely caused due to an increase in the amount of greenhouse gases in Earth's atmosphere.
Some examples of greenhouse gases present in the atmosphere are methane, water vapor, carbon dioxide etc.
Matching the descriptions with their term respectively, we have;
1. Greenhouse gas: carbon dioxide, water vapor, methane, nitrogen oxides, and some CFCs that absorb heat and keep it in the earth's atmosphere
2. Carbon sequestration: it's a technology used to capture the carbon released from smokestacks and store it in some part of the environment to keep it out of the atmosphere. Thus, it's a process that is typically used for capturing and the long-term storage of atmospheric carbon dioxide in soil, ocean, plants and geologic formation, so as to reduce global warming or climate change.
3. Greenhouse effect: it's a term used to describe the negative role that greenhouse gases such as methane, water vapor, carbon dioxide etc., play in keeping the earth warm.
Which of the following are 'natural polymers
(bio-molecules)? Choose all that apply.
nylon
teflon
silk
cellulose
proteins
polyethylene
Answers
Answer
Proteins
Cellulose
And Silk
Explaination
There are two types of polymers: synthetic and natural.
Synthetic polymers are derived from petroleum oil and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy.
Polyvinyl chloride, commonly abbreviated PVC, is the third-most widely produced synthetic plastic polymer.
Natural polymers occur in nature and can be extracted. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins and rubber.
Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. She has begun studying the materials used to fill walls. She knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water. Which of these is a molecular ingredient that could be used in a wall-filling material ?
Answers
Answer: C6H6
Explanation:
The molecular formula C₆H₆ represents Benzene. Benzene is colorless, flammable, and has a sweet and gasoline-like odor. It's a toxic chemical, and can cause cancer.
Benzene is a hydrocarbon and used for the manufacturing of products such as plastic, detergents, glues, dyes, and rubber. It can also be used in making wall-filling material.
Answer: C6H6
Explanation:
The molecular formula C₆H₆ represents Benzene. Benzene is colorless, flammable, and has a sweet and gasoline-like odor. It's a toxic chemical, and can cause cancer.
Benzene is a hydrocarbon and used for the manufacturing of products such as plastic, detergents, glues, dyes, and rubber. It can also be used in making wall-filling material.
How many grams are in 562 dg?
56.2 g
56,200 g
5.620 g
5.62 g
Answers
Answer:
56.2
Explanation:
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19
Gold reacts with the elements in Group 7 of the periodic table.
0.175 g of gold reacts with chlorine.
The equation for the reaction is:
2 Au + 3 Cl2 - 2 AuCla
Calculate the mass of chlorine needed to react with 0.175 g of gold.
Give your answer in mg
Relative atomic masses (Ar): Cl = 35.5 Au = 197
Answers
Answer: The mass of chlorine gas required is 94.6 mg
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of gold = 0.175 g
Molar mass of gold = 197 g/mol
Plugging values in equation 1:
[tex]\text{Moles of gold}=\frac{0.175g}{197g/mol}=0.000888 mol[/tex]
The given chemical equation follows:
[tex]2Au+3Cl_2\rightarrow 2AuCl_3[/tex]
By the stoichiometry of the reaction:
If 2 moles of gold reacts with 3 moles of chlorine gas
So, 0.000888 moles of gold will react with = of chlorine gas
Molar mass of chlorine gas = 71 g/mol
Plugging values in equation 1:
[tex]\text{Mass of chlorine gas}=(0.001332mol\times 71g/mol)=0.0946g=94.6mg[/tex] (Conversion factor: 1 g = 1000 mg)
Hence, the mass of chlorine gas required is 94.6 mg
Hello, Flashligh explain where the energy comes from and how it is affecting change or putting an object in motion
Answers
Answer:
Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix.
The energy associated with an object's motion is called kinetic energy. Kinetic energy is the energy of motion. All moving objects have kinetic energy
Explanation:
Answer:
Kinetic energy is the energy of motion. All moving objects have kinetic energy. When an object is in motion, it changes its position by moving in a direction: up, down, forward, or backward. As he winds up and releases the ball, the stored energy is changed into kinetic energy, the energy of motion!So that , energy comes from and how it is affecting change or putting an object in motion.
Explanation:
I ain't flashligh
Consider the two facts below:
Fact 1: Dissolved oxygen is one of the most
important nutrients needed by fish in the aquatic
environment to survive.
Which scenarios may be explained by the facts on
the left? Check all that apply.
ID There is more dissolved oxygen in colder
waters than in warm water.
IM
Fact 2: Unlike solids, whose solubility increases
with increasing temperature, the solubility of gases
generally decreases with increasing temperature.
IND
There is less dissolved oxygen in colder
waters than in warm water.
Fish life in the ocean is more abundant during
the seaons with warmer water than seasons
with cooler water
HII
If ocean temperatures rise, then the risk to
the fish population increases.
DONE W
Answers
Answer:
A. There is more dissolved oxygen in colder waters than in warm water.
D. If ocean temperature rise, then the risk to the fish population increases.
Explanation:
Conclusion that can be drawn from the two facts stated above:
*Dissolved oxygen is essential nutrient for fish survival in their aquatic habitat.
*Dissolved oxygen would decrease as the temperature of aquatic habit rises, and vice versa.
*Fishes, therefore, would thrive best in colder waters than warmer waters.
The following are scenarios that can be explained by the facts given and conclusions arrived:
A. There is more dissolved oxygen in colder waters than in warm water (solubility of gases decreases with increase in temperature)
D. If ocean temperature rise, then the risk to the fish population increases (fishes will thrive best in colder waters where dissolved oxygen is readily available).
Answer: the answers are A and D
Explanation:
i got it right
what is Tyndall effect ?
Answers
My answer is in the picture.
Hope that helpsStay safe always
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⏩ The scattering of a beam of light through a colloidal solution in its dispersed phase is known as [tex]\large\boxed{tyndall \ \ effect}[/tex].
⁺˚*･༓☾✧.* ☽༓･*˚⁺‧
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꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐
How many moles of NaOH are present in 22.0 mL of 0.140 M NaOH?
Answers
Answer:
Mole of NaOH = 0.00308 mole
Explanation:
From the question given above, the following data were obtained:
Volume = 22 mL
Molarity = 0.140 M
Mole of NaOH =?
Next, we shall convert 22 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
22 mL = 22 mL × 1 L / 1000 mL
22 mL = 0.022 L
Finally, we shall determine the number of mole of NaOH in the solution. This can be obtained as shown below:
Volume = 0.022 L
Molarity = 0.140 M
Mole of NaOH =?
Molarity = mole / Volume
0.140 = Mole of NaOH / 0.022
Cross multiply
Mole of NaOH = 0.140 × 0.022
Mole of NaOH = 0.00308 mole
Thus, 0.00308 mole of NaOH is present in the solution.
If a tornado causes considerable damage with wind speeds of 111 to 135 miles per hour, it’s classified as _______ on the Enhanced Fujita Scale.
The type of major storm called a/an _______ is driven primarily by the Coriolis effect.
The weather pattern that stays over one area for an extended period of time is known as _______.
What are the two types of downbursts, and how are they different?
How is a funnel cloud different from a tornado?
Why does a hurricane begin to dissipate after it makes landfall?
Explain how the heat index and the wind chill index are similar and different.
What type of severe weather prevents sweat from evaporating to cool down bodies?
Answers
Answer:
EF-2
hurricane/tropical cyclone
recurrent weather
The two types of downbursts are macrobursts and microbursts. A macroburst affects an area that's greater than 2.5 miles across. A microburst affects an area that's less than 2.5 miles across.
A funnel cloud forms as a spinning column of air that descends from a thundercloud. However, a funnel cloud doesn't become a tornado until it actually touches the ground. Once it touches the ground, where it begins to pick up dust and debris, it becomes a tornado.
Tropical cyclones, such as hurricanes, are fueled by warm ocean waters. Once they make landfall, they lose this fuel source and begin to lose strength.
The heat index and the wind chill index are similar because both consider other factors that affect how air temperature feels. The heat index considers relative humidity in relation to air temperature. Higher humidity makes air temperatures feel hotter. The wind chill index considers wind speed in relation to air temperature. Higher wind speeds make air temperatures feel colder.
Heat waves—Heat waves can be very dangerous when accompanied by high humidity. The human body depends on evaporation of sweat to cool itself down on hot days. When humidity levels are high, the rate of evaporation slows down. Consequently, it becomes harder for the body to cool itself and much easier for the body to overheat.
Explanation:
took the testoronee
Calculate the percentage of water of crystallisation in MgSO⁴ 7H²O
Answers
Answer:
Formula of EPSOM salt = MgSO4.7H2O
molecular mass of MgSO4.7H2O = atomic mass of Mg + atomic mass of S + 4 × atomic mass of O + 7 { 2 × atomic mass of H + atomic mass of O }
= 24 + 32 + 4× 16 + 7{ 2 × 1 + 16 } g/mol
= (24 + 32 + 64+ 126 ) g/mol
= 246 g/mol
molecular mass of total water = 7 × ( 2× atomic mass of H + atomic mass of O )
= 7 × 18 = 126 g/mol
now ,
% mass of H2O in EPSOM salt = {total molar mass of H2O/molar mass of Epsom salts }× 100
= {126/246 } × 100
= 12600/246
= 51.21 %
Explanation:
i have done it hope it helps
Help me with this question
Define a unit? write it's type
Answers
Answer:
Unit is the standard assigned to measure physical quantity. ... Length, mass, time, temperature, luminous intensity, and the electric current are known as the fundamental quantities. These are represented by L, M, T, 0, Cd, and A respectively
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Select the atoms that are likely to gain electrons to form anions:
A. Cesium (Cs)
B. Chlorine (CI)
c. Nitrogen (N)
D. Sulfur (S)
hurryyy asap make u the brainlyeist
Answers
Answer:
c
Explanation:
In a mass spectrum, there are two peaks, one at m/z 63.0 with percentage abundance 69.1% and another peak at m/z 65.0 with percentage abundance 30.9%. Determine the relative atomic mass (Ar) for this element, giving the answer to 3 significant figures (no units required).
Answers
Explanation:
hope the picture above help u understand:)
The relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures).
To determine the relative atomic mass (Ar) of the element, we use the following formula:
Ar = (m₁ × % abundance1 + m₂ × % abundance2) / 100
Where:
m₁ and m₂ are the masses of the isotopes (peaks) in the mass spectrum,
% abundance1 and % abundance2 are the percentage abundances of the corresponding isotopes.
Given information:
Peak at m/z 63.0 with a percentage abundance of 69.1%.
Peak at m/z 65.0 having a percentage abundance of 30.9%.
Calculate the weighted average mass of the element's isotopes.
Ar = (63.0 × 69.1 + 65.0 × 30.9) / 100
Ar = (4347 + 2009.5) / 100
Ar = 6356.5 / 100
Ar ≈ 63.565
Noe, let's round the calculated mass to three significant figures.
Ar = 63.6
So, the relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures). This means that the average mass of the element's atoms is approximately 63.6 times the mass of one-twelfth of a carbon-12 atom, which is the standard reference for atomic masses.
To know more about relative atomic mass here
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Find out how many atoms will fit in one apple . Adius of an apple is about 3.5 cm and the radius of an atom is 1.5 angstrom
Answers
Answer:
1.3 × 10²⁵ atoms
Explanation:
Step 1: Calculate the volume of an apple
The radius of an apple is 3.5 cm (3.5 × 10⁻² m). If we assume it is a sphere, we can calculate its volume using the following expression.
V = 4/3 × π × r³
V(apple) = 4/3 × π × (3.5 × 10⁻² m)³ = 1.8 × 10⁻⁴ m³
Step 2: Calculate the volume of 1 atom
The radius of 1 atom is 1.5 A (1.5 × 10⁻¹⁰ m). If we assume it is a sphere, we can calculate its volume using the following expression.
V = 4/3 × π × r³
V(atom) = 4/3 × π × (1.5 × 10⁻¹⁰ m)³ = 1.4 × 10⁻²⁹ m³
Step 3: Calculate how many atoms are in 1 apple.
V(apple)/V(atom) = 1.8 × 10⁻⁴ m³/1.4 × 10⁻²⁹ m³ = 1.3 × 10²⁵
1.1 Define the concept risky behaviour?
Answers
Answer:
Risky behavior or risk-taking behavior is defined according to Trimpop (1994) as “any consciously, or non-consciously controlled behavior with a perceived uncertainty about its outcome, and/or about its possible benefits, or costs for the physical, economic or psycho-social well-being of oneself or others.” In addition to this broad definition, there are other definitions of risky behavior depending on the field of research. While in the economic view, risk is defined in terms of the variability of possible monetary outcomes, in the clinical literature, the risk is generally defined as exposure to possible loss or harm (Schonberg, Fox, & Poldrack, 2011). Turner et al. (2004) described risk-taking behavior further as either a socially unacceptable volitional behavior with a potentially negative outcome in which precautions are not taken, such as speeding, drinking and driving, drugs abuse, unprotected sex and so on.
You're a dentist and want your patients to have the cleanest smiles possible. You're not sure which toothpaste to recommend and decide to design an
experiment to determine which toothpaste gives the brightest and whitest smile.
1) What variables would you need to control in your
experiment?
2) Which variable would you change to determine which toothpaste is best?
3) What is the measurable outcome for this experiment?
d) What would the procedure be for your experiment? Please help me to answer this questions:(
Answers
Answer:
Why do you need good toothpaste?
Explanation:
Answer:
Do this yourself smh this isnt what the wesite is for
Explanation:
Calculate the heat energy, in kJ, required to melt 1.0kg of ice at 0 degrees celcius.
Show all working out
Answers
Answer:
here is the answer. Feel free to ask for more chem help <3
(1) The solubility of Salt AB2(S) IS 5mol/dm^3.
a. Obtain an expression for the solubility product of AB2(S),in terms of s.
b. Calculate the Ksp of AB2,given that solubility is 2.4x10^3mol/dm^3
Answers
Answer:
a. Ksp = 4s³
b. 5.53 × 10⁴ mol³/dm⁹
Explanation:
a. Obtain an expression for the solubility product of AB2(S),in terms of s.
AB₂ dissociates to give
AB₂ ⇄ A²⁺ + 2B⁻
Since 1 mole of AB₂ gives 1 mole of A and 2 moles of B, we have the mole ratio as
AB₂ ⇄ A²⁺ + 2B⁻
1 : 1 : 2
Since the solubility of AB₂ is s, then the solubility of A is s and that of B is 2s
So, we have
AB₂ ⇄ A²⁺ + 2B⁻
[s] [s] [2s]
So, the solubility product Ksp = [A²⁺][B⁻]²
= (s)(2s)²
= s(4s²)
= 4s³
b. Calculate the Ksp of AB₂, given that solubility is 2.4 × 10³ mol/dm³
Given that the solubility of AB is 2.4 × 10³ mol/dm³ and the solubility product Ksp = [A²⁺][B⁻]² = 4s³ where s = solubility of AB = 2.4 × 10³ mol/dm³
Substituting the value of s into the equation, we have
Ksp = 4s³
= 4(2.4 × 10³ mol/dm³)³
= 4(13.824 × 10³ mol³/dm⁹)
= 55.296 × 10³ mol³/dm⁹
= 5.5296 × 10⁴ mol³/dm⁹
≅ 5.53 × 10⁴ mol³/dm⁹
Ksp = 5.53 × 10⁴ mol³/dm⁹
The answer to this question is D as it says in the answer sheet of the question paper but how?
Answers
Answer:
D
Explanation:
Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.
Answer:D
Explanation:Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.
What does botanist study? A. Boats
B.Matter
C. chemicals
D. Plants
Answers
What does botanist study?
[tex]\implies {\blue {\boxed {\boxed {\purple {\sf {D.\: Plants}}}}}}[/tex]
[tex]\bold{ \green{ \star{ \orange{Hope\:it\:helps.}}}}⋆[/tex]
Substances with a high polarity have a(low/high) surface tension ?
Answers
Answer:
I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.
Explain how you determine the molar mass of Al2(SO4)3
Answers
Molar Mass of Al = 27
Molar Mass of S = 32
Molar Mass of O = 16
Putting the molar mass value in Al2 (SO4) 3
27 x 2 + 3 ( 32 + 16 x 4)
54 + 3 ( 32+ 64)
54 + 3 x 96
54 + 288
342
Are neutralization reactions always exothermic ?
Answers
:]
Explanation:
Neutralisation reactions are not always exothermic. ... When an acid is neutralised by an alkali the reaction is exothermic.SInce strong acids and strong bases are completely dissociated in solution, no formal bonds are being broken. The formation of two very strong covalent bonds between hydrogen and the hydroxide ion is responsible for the neutralization reaction's exothermic character.
hope it helps
stay safe healthy and happy...Someone please help fast!!!please
Answers
Answer:
7276783
Explanation:
8765467
explain how a kaleidoscope can be used as evidence to explain the behavior of light waves
(help asap) PLEASE HELP
Answers
Answer:
As you turn the tube you can see patterns of colors at the other end of the tube. A kaleidoscope works by reflecting light. Light travels in a straight line. When light bumps into something it changes direction.
Kaleidoscopes are made with two or more mirrors. Light reflecting between these mirrors produces multiple virtual images of stunning beauty. ... Light rays are assumed to bounce off the mirrors like a ball bounces off a hard surface. Formally stated, the angle of incidence equals the angle of reflection.
Explanation:
