Answer:
562g
Explanation:
Molar mass of Ca = 40g/mol
1 mol gives 6.02×10^23 atoms
Xmol of Ca gives 8.46×10^24 atoms
X= 14.05 mol
No of mol= mass/molar mass
Mass = 40 ×14.05 = 562g.
Determine the molecular weight of H2O.
189
18.0 g
18.019
18.016 9
Answer:
18.01534
The last one
Explanation:
The molar mass of H20 is 15.9994+(2 x 1.00797) which equals 18.01534 grams/mole.
True
False
1. The phenolphthalein indicator is not affected by the pH of the
solution.
Answer:
the answer is False.
Explanation:
the indicator solution is directly related to the PH. When the solution becomes neutral (ph 7), the indicator will become clear.
The statement that Phenolphthalein is not affected by PH is False
Phenolphthalein is a colorless chemical compound, when added to alkaline solutions it will turns pink, which means it has been affected by the PH.Phenolphthalein will remain colorless if in acidic solution, that's less than PH of 7. But at pH level of 8.2 it turns pink then at pH 10 it turns magenta.Therefore, PH do affect Phenolphthalein indicator
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Calculate the pH of a solution of 0.25M H2SO4
Answer:
im pretty sure its 1.3 if its wrong sorry
Explanation:
Which catalyzed reaction breaks up ozone? 2H2O2(l) right arrow with upper M n upper O subscript 2 above it. 2H2O(l) + O2 O3 + O Right arrow with upper C upper S above it. 2O2 2H2O2 (aq) Right arrow with upper P t subscript 3 above it. 2H2O(l) + O2 O2 + 2SO2Right arrow with upper N upper O above it. 2SO3
Answer: B
Explanation: The answer is B
The balanced equation of the decomposition reaction of ozone is written as below:
[tex]\rm O + O_{3} \rightarrow 2O_{2}[/tex]
Hence, option b is correct.
What is ozone ?Ozone is a toxic gas formed by the combination of atmospheric oxygen with nascent oxygen gas. Ozone exists as a layer in the stratospheric layer of the atmosphere.
Ozone protects earth from harmful UV rays. Decomposition of ozone results in depletion of ozone layer which leads to the UV radiation reaching intensely to the earth's surface.
The oxygen gas formed from the decomposition of ozone further reacts with sulphur gas as written above produce harmful sulphur dioxide. Sulphur dioxide further reacts with water forms sulphuric acid causes acid rain.
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what is the coefficient for calcium oxide? CaO(s) + CO2(g) → CaCO3(s)
Answer:
The coefficient is 1
Explanation:
CaO(s) + CO2(g) -> CaCO3(s)
In the balanced equation, the coefficient for CaO is 1
The coefficient represents the number of moles of a compound in the stoichiometry of the reaction
Final answer:
The coefficient for calcium oxide in the reaction CaO(s) + CO₂(g) → CaCO₃(s) is 1. The reaction is in stoichiometric balance, with each reactant and product having a coefficient of 1, indicating a 1:1:1 molar ratio.
Explanation:
The coefficient for calcium oxide in the equation CaO(s) + CO₂(g) → CaCO₃(s) is 1. In chemical reactions, the coefficients indicate the number of moles of each substance involved in the reaction. In this case, one mole of calcium oxide reacts with one mole of carbon dioxide to produce one mole of calcium carbonate, making the coefficient for each reactant and product 1. This balanced equation represents a stoichiometric relationship, meaning the number of atoms for each element is conserved.
Moreover, understanding the reaction between calcium oxide and water or carbon dioxide and water provides important context. Calcium oxide reacts with water to form calcium hydroxide (Ca(OH)₂), and carbon dioxide reacts with water to form carbonic acid (H₂CO₃). However, these are separate reactions from the one in the question. The decomposition reaction of calcium carbonate into calcium oxide and carbon dioxide is represented by the equilibrium equation: CaCO₃ (s) ⇌ CaO (s) + CO₂ (g). This equilibrium illustrates that the reaction can proceed in both the forward and reverse directions, and under certain conditions, can achieve a 100% yield of calcium oxide if the carbon dioxide is continuously removed.
Why is sexual reproduction beneficial
How many grams of chlorine gas are needed to
react with 3.50 liters of a 1.70 molar potassium
bromide solution?
Cl2 + 2KBr — 2KCI + Br
Answer:
answer pl
please
because I
Question 2 (1 point)
What are the products of the precipitation reaction:
NaOH (aq) + CuBr2 (aq) –
2NaOH + CuBr2 => 2NaBr + Cu (OH)2
Can someone please help me ASAP
Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.
In her experiment, which of the following factors should Nancy make sure that she does not change?
It Is A Type Of Lily
Regarded botanically as perennial with the scientific name herbaceous perennial, Agapanthus Peter Pan is an African lily. Hence, it’s also called as “The Blue African Lily of the Nile”. The flowers appear in trumpet-shaped rounded clusters with darker mid-vein petals.
They come out in an upright position due to its long stalks and are surrounded by narrow, loose and strap-shaped leaves. In addition, some categorize the plant under bulbs although it’s not, but due to the fact that it has fleshy and thick roots.
#3 – It Has Other Names
There are other terms known for Agapanthus Peter Pan. Other than simply African lily, this is often called as The Blue African Lily of the Nile, African Lily Peter Pan, Lily of the Nile Peter Pan, Dwarf Lily of the Nile and Dwarf African Lily. This also explains the reason why most of the imported evergreen agapanthus came from certain parts of South Africa as these are better grown in milder climate areas with higher or heavy rainfall.
Therefore, the flowers typically bloom from the months of July to August, which are commonly known as the summer season in the US, Canada and Europe, and extends up to October. Of course, you’d see the glamorous, blue flowers in spring too.
#5 – It Needs Full Sun
This beautiful flower relies on sunlight in order to grow and remain healthy. However, planting it around a partly shaded area is alright.
You also have to keep in mind that this kind of plant must not be dried out or else it dies. Thus, watering regularly is a basic priority.
#6 – It Can Survive The Winter
Although it’s best planted in milder areas and sunny season, Agapanthus Peter Pan can endure the coldness of fall and winter seasons. In fact, you can place foliage in a pot or a small container so you can easily transport it inside your home.
This also implies that you don’t need a large, spacious garden to display this plant around your surroundings.
#7 – It Is Not Shrubby
Unlike some plants, Agapanthus Peter Pan grow in almost round, V-shape without spreading in a way that it reaches to an unparalleled position.
Its spread extends from 1 to 2 inches. Nevertheless, it can definitely create an elegant landscape view whether it’s planted in front of your house or in the backyard.
Based on an article excerpt from Plant Care Today, Agapanthus plants generally grow from 18 inches to 5 feet depending on the variant. But for Agapanthus Peter Pan, it can grow to a minimum height of 8 inches to 18 inches.
#8 – It Most Likely Grows In Moist, Drained Soil
In addition to the climate, remember that plants are best nurtured in an area where the kind of soil is met. It has to be a soil type of chalk, clay, loam or sand. In the case of Agapanthus Peter Pan, fertile, moist and well-drained soil must be considered.
#9 – It Is Easy To Grow
This plant requires low maintenance. All you need is enough sun, water and well-drained soil. Consider adding some organic material for fertilizing if you want to keep the plant healthy and flowers stunningly beautiful.
#10 – It Attracts Butterflies And Birds
The beauty of the blue flowers of Agapanthus Peter Pan is evident and undeniable due to the fact that they are favorite places for small birds and butterflies to go to. An even more so interesting fact is that it’s free from pests and diseases. It is also rabbit, deer and drought resistant.
Growing and Maintenance Tips:
As mentioned previously, Agapanthus Peter Pan is less difficult to take care of. But doing the right way is still vital to bear in mind. So here’s a list of quick tips on how to properly plant this agapanthus for beginners and maintain its beautiful foliage.
The Planting Process
1. If you choose to plant in the ground, dig holes but not too deep.
2. Amend the soil with some organic matter as fertilizer.
3. Carefully remove the plants from the containers and make sure the root ball is intact.
4. Loosen the soil and roots around the bottom as well as the edges of the root ball.
5. Place the plant in the hole leveling with surrounding soil, and spread roots outward.
6. Fill in the hole and around the roots with amended native soil.
7. Gently water.
8. Cover the whole area with leaf or bark.
9. Water again but this time deeply.
The Regular Watering Process
Water every morning. Night watering may promote diseases. As you water, go slowly and deeply, and if possible, do it twice with a few minutes apart. Keep in mind that you avoid over watering as this can cause some root problems. To conserve water, use a hose. Just keep the soil wet! And water the flowers everyday!
Answer: The amount of water she pours on the model
Explanation: Nancy wants to test how a hill's slope can affect erosion. Because of this, she will want to change the height of one end of her hill model as she pours water down the slope. Other variables, such as the amount of water she pours on the model and the type of soil she uses, should not change.
If 6.42 g of water is produced, how many grams of oxygen gas reacted?
Answer:
5.76g
Explanation:
2H2 + O2 => 2H2O
Molar mass of H2O = 18g/Mol
No of mole of H2O = 6.42/18 = 0.36 moles of water.
1 mole of O2 gives 2 moles of water.
Xmole of O2 gives 0.36 moles of water.
X = 0.36/2 = 0.18 mole
Molar mass of O2 = 32g/mol
Mass = 32 × 0.18 = 5.76g.
How do the isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) differ?
A. deuterium has one more electron than tritium
B. tritium has one more neutron than deuterium
C. deuterium has two protons
D. there is no difference because it is the exact same atom.
The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) differ in the number of neutrons in their nuclei. Option B is the answer.
Explanation:The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) have different numbers of neutrons in their nuclei. Deuterium has one more neutron than hydrogen-1, while tritium has two more neutrons than hydrogen-1. The difference in the number of neutrons gives these isotopes different properties and behaviors.
Option B is the correct answer: tritium has one more neutron than deuterium. The number of electrons and protons in isotopes of an element remains the same, so options A and C are incorrect. Option D is also incorrect because deuterium and tritium are different isotopes of hydrogen with different numbers of neutrons.
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TRUE or FALSE: Volcanoes help warm the planet by releasing CO2 (carbon dioxide)
Answer: TRUE
Explanation: I’d say it is true because lava comes out of volcanos and lava is obviously VERY hot so it must help warm the planet by realizing carbon dioxide.
Which of the following is closest to the meaning of the term ancestor?
A. a relative from long ago
B. an organism that has evolved
C. a trait that has changed over time
D. an organism that is adapted to its environment
Answer:
I would say A
Explanation:
our ancestors are the people that lived long before us
The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCl (aq)) in 133 mL of water is ___ M (2 decimal place).
The molarity is 3.50 M/L.
Explanation:
Molarity is found to know the amount of the solute ions present in the given volume of solution. So we determine it using the ratio of the moles of solute to the volume of the solution.
As here the weight of the solute which is hydrochloric acid is given as 17g, so we need to find the moles of it. This can be done by dividing the given amount of HCl with the molecular weight of HCl.
Molecular weight of HCl = 1.01 + 35.45 = 36.46 g/mol
So the number of moles of HCl present here will be
[tex]No.of moles = \frac{17}{36.46} =0.466[/tex]
So, 0.466 moles of HCl is present in the solution.
[tex]Molarity = \frac{No.of moles of solute}{Volume of solution} = \frac{0.466}{133*10^{-3} }[/tex]
[tex]Molarity = 3.50 M/L[/tex]
Thus, the molarity is 3.50 M/L.
An equilibrium mixture of O2, SO2 and SO3 contains equal concentrations of SO2 and SO3.
Calculate the concentration of O2 if Kc = 270 for the reaction: 2 SO2(g) + O2(g) - 2 SO3(0)
Answer:
[O₂(g)] = 0.0037M
Explanation:
2SO₂(g) + O₂(g) => 2SO₃(g)
Conc: [SO₂(g)] [O₂(g)] [SO₃(g)] and [SO₂(g)] = [SO₃(g)]
Kc = [SO₃(g)]²/[O₂(g)][SO₂(g)]² => Kc = 1/[O₂(g)] = 270 if [SO₂(g)] = [SO₃(g)]
∴ [O₂(g)] = (1/270)M = 0.0037M
The equilibrium constant Kc is the ratio of concentration of products to the product of concentrations of reactants. Here, the concentration of O₂ will be 0.0037 molar.
What is Kc ?Kc of a reaction is the equilibrium constant of that reaction expressed in terms of concentration of products and reactants. It is the ratio of product of molar concentration of products to the product of molar concentration of the reactants.
An equilibrium mixture of a reaction is attained when the reaction in both forward and backward reaction occurs in same rate.
The equilibrium constant Kc for the given reaction can be written as follows:
[tex]Kc = \frac{[SO_{3}]}{[SO_{2}][O_{2}]} = 270[/tex]
Provided that the concentrations [SO₃] and [SO₂ are equal and thus the expression becomes:
Kc = 1/[O₂] = 270
[O₂] = 0.0037 M
Hence, the molar concentration of oxygen in equilibrium mixture of the reaction is 0.0037 molar.
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Electrons aren’t just smaller than atoms .electrons are part of
4. Draw a Lewis dot diagram of Lithium bonding with Fluorine. How many electrons moved?
One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF. Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy. So the fluorine atom has eight electrons, and a filled outer shell.
An image is attached for reference.
What is always true of a weak base
Answer: Some of the original base remains in the solution.
need help
Two objects (A and B) of the same temperature are in contact with each other.
Which statement is true?
Although the molecules collide, no heat transfers because there is no temperature difference between the objects.
Heat transfers from object B to object A, because molecules from B collide with those from A.
Heat transfers from object A to object B, because molecules from A collide with those from B.
No heat transfers, because there are no collisions between the molecules of the objects.
Answer:
The answers are either 1 or 4
Explanation:
I am pretty dure it is 1
If two objects A and B of same temperature are in contact with each other, there will be no transfer of heat. Hence, option A is true.
Heat TransferHeat is the transfer of energy from one object to another, for this transfer it is necessary that there is difference between the temperature of the objects.
In this question the objects A and B of the same temperature are in contact with each other, and the law of transfer of heat energy says without temperature difference there will be no heat transfer, hence the option A which says "Although the molecules collide, no heat transfers because there is no temperature difference between the objects" is correct.
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Which actions conserve fossil fuels? Choose the two correct answers.
A.
wasting food
B.
riding a bike
C.
planting trees
D.
buying bottled water
E.
using less electricity
Balance this equation:
How many molecules of ATP may be produced from glucose
Explanation:
38 ATP molecules May be produced from glucose
In aerobic respiration, which occurs in the presence of oxygen, one molecule of glucose can produce a maximum of 36 to 38 molecules of adenosine triphosphate (ATP) through the process of cellular respiration. This process involves several steps, including glycolysis, the Krebs cycle, and oxidative phosphorylation.
During glycolysis, which takes place in the cytoplasm, two molecules of ATP are produced directly from one molecule of glucose. The remaining ATP molecules are generated during the later stages of cellular respiration.
In the Krebs cycle and oxidative phosphorylation, the breakdown products of glucose undergo further chemical reactions that release energy. This energy is then used to produce ATP through a process called oxidative phosphorylation, which occurs in the mitochondria.
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2 upper N upper o upper c l double-headed arrow 2 upper N upper O (g) plus upper C l subscript 2 (g).
At equilibrium, the concentrations are as follows.
[NOCl] = 1.4 ´ 10–2 M
[NO] = 1.2 ´ 10–3 M
[Cl2] = 2.2 ´ 10–3 M
What is the value of Keq for the reaction expressed in scientific notation?
1.6 ´ 10–5
6.2 ´ 10–4
6.2 ´ 104
1.6 ´ 105
Answer:
1.6x10^–5
Explanation:
Step 1:
The balanced equation for the reaction.
This is illustrated below:
2NOCl <=> 2NO + Cl2
Step 2:
Data obtained from the question.
[NOCl] = 1.4x10^–2 M
[NO] = 1.2x10^–3 M
[Cl2] = 2.2x10^–3 M
Equilibrium constant, K =?
Step 3:
Determination of the equilibrium constant.
The equilibrium constant for the above equation can be written as:
K = [NO]^2 [Cl2] / [NOCl]^2
Inputing the values of the [NO], [Cl2] and [NOCl], the equilibrium constant is:
K = [NO]^2 [Cl2] / [NOCl]^2
K = (1.2x10^–3)^2 x (2.2x10^–3) / (1.4x10^–2)^2
K = 1.6x10^–5
Answer:
A
Explanation:
Identify the spectator ions in this reaction:
H+ + Br – + K+ + OH– --> K+ + Br– + H2O
H+ and K+
Br – and OH–
K+ and Br–
Answer:
the correct answer is C) K+ and Br-
Explanation:
Spectator ions are the ions on the right side of the equation which do not combine to form products. we can see that potassium ions (K+) and bromine ions (Br-) appear unreacted on both sides of the equation
Will a precipitate form if you mix barium chloride and potassium carbonate?
Potassium carbonate reacts with barium chloride to precipitate insoluble barium salts that is barium carbonate, when the solutions are mixed together you'll see white precipitate that is barium carbonate and potassium is dissolve in the solution to form potassium chloride.
How many grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C?
Answer:
82 grams of sodium nitrate (NaNO2) will dissolve in 100 grams of water at 20°C.
Explanation:
90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.
To determine the grams of sodium nitrate (NaNO2) that will dissolve in 100g of water at 20°C, we can use the solubility data for NaNO2 at that temperature.
According to the solubility data:
- Solubility of NaNO2 in water at 20°C = 90.0 g/100 g water
This means that 100g of water can dissolve 90.0g of NaNO2 at 20°C.
So, if we have 100g of water, the maximum amount of NaNO2 that can dissolve in it is 90.0g.
Therefore, 90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.
what is the difference between speed, velocity,acceleration.
Answer:
Velocity is the rate of change of displacement( change of distance in a particular direction with respect to time) , and acceleration is the rate of change of velocity per unit of time. ... Also, speed is a scalar quantity but velocity and acceleration are vector quantities.
Explanation:
How much heat (in Joules) is needed to raise the temperature of 257g of ethanol (cethanol=2.4 J/g°C) by 49.1°C?
Answer:
Q = 30284.88 j
Explanation:
Given data:
Mass of ethanol = 257 g
Cp = 2.4 j/g.°C
Chnage in temperature = ΔT = 49.1°C
Heat required = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Now we will put the values in formula.
Q = 257 g× 2.4 j/g.°C × 49.1 °C
Q = 30284.88 j
An opened carbonated drink is an example of what type of solution? *
Answer:
An open carbonated drink is an example of a saturated solution.
Explanation:
A carbonated drink is a saturated solution of carbon dioxide in water under a certain pressure. If the soft drink container is opened, the pressure on the surface of the drink is decreased to atmospheric pressure, and several carbon dioxide molecules leave the solution, and if enough time passes, the drink will end without gas.
Answer:
It is an example of an Aqueous solution.
Explanation:
A solution is a mixture that contains one or more solutes in a solvent. It can be in a solid, liquid or gaseous form, or the combination of two or more.
A carbonated drink is a solution that contains majorly liquids and gases. The main gas is the carbon (IV) oxide that has been used to preserve its taste.
When a bottle of carbonated drink is opened, the gas (carbon dioxide) stored under pressure escapes and evaporates. Thereby causing bubbles to move within the content of the bottle.
This is an example of an aqueous solution because the major solvent in the drink is water.