Answer:
2 ........... cuz CaCl2
Ctab, the surfactant used in this experiment does not dissolve in hexane. Why not?.
The surfactant does not dissolve in hexane due to its polar nature.
Why the surfactant does not dissolve?The surfactant used in this experiment does not dissolve in hexane because hexane is non-polar solvent whereas the surfactant is polar in nature and we know that polar solutes only dissolve in polar solvent so we can conclude that the surfactant does not dissolve in hexane due to its polar nature.
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How many grams of naoh are needed to prepare 546 ml of solution with a ph of 10. 00?.
Answer:
1. determining the pOH of the solution from the given pH of 10.00 assuming the solution is at 25° C.
Explain the seasonal fluctuation in the carbon dioxide levels each year. What months have lower CO2 and why? Look at the “Mauna Loa Daily, Monthly, and Weekly Averages for 2 years” in the “Interactive Plots”. Keep in mind that trees are growing more when it’s warm in this environment. What happens CO2 levels when the trees are more active? please help it's something you have to explain
Answer:
in the Earth’s atmosphere vary as the seasons change. Students also learn that even with these seasonal variations, the overall amount of CO 2 is increasing in the atmosphere as a result of people’s activities, which are changing the natural carbon cycle.
Explanation:
What ions are formed when naoh is dissolved in water?.
Answer:
When sodium hydroxide (NaOH) dissolves in water, it separates into positively - charged sodium ions (cations) and negatively - charged hydroxide ions (anions).
Hope this helped.
The ka of hydrofluoric acid (hf) at 25. 0 °c is 6. 8 × 10-4. What is the ph of a 0. 25 m aqueous solution of hf?.
Answer:
HF <==> H+ + F-
Ka = 6.8x10-4 = [H+][F-] / [HF]
6.8x10-4 = (x)(x) / 0.25 - x (assume x is small relative to 0.25 and ignore it to avoid using quadratic)
6.8x10-4 = x2 / 0.25
x2 = 1.7x10-4
x = 1.3x10-2 M (this is ~ 5.2% of 0.25 so our assumption above was not valid. We must use quadratic)
6.8x10-4 = x2 /0.25 - x
1.7x10-4 - 6.8x10-4 x = x2
Use quadratic to find x = 0.0127 M = [H+]
pH = -log H+ = -log 0.0127
pH = 1.90 so answer is probably 1.88(B)
Explanation:
Have a great day ahead" :)
I really struggle in science and I am doing a check and Ive seem to kinda? "forgot" hahah-
Answer:
1) Since they are both negatively charged they start to push each other away to go pair with positively charged ions. 2) These oppositely charged ions attract each other to form ionic networks (or lattices). Electrostatics explains why this happens: opposite charges attract and like charges repel. When many ions attract each other, they form large, ordered, crystal lattices in which each ion is surrounded by ions of the opposite charge. 3) Metals form positive ions (cations). A magnesium atom must lose two electrons to have the same number of electrons as an atom of the previous noble gas, neon. Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. 4) Nonmetals form negative ions (anions). A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−.
Explanation:
Hope this helped.
A brainliest is always appreciated.
is mendelevium flammable
18 which solution has a molality of 0.25 m Naci?
0.5 mol Naci in 4.0 kg water
0.25 mol NaCl in 10 kg water
0.25 g Nai in 1.0 kg water
1.0 kg NAC in 40 kg water
In a chemical reaction, two molecules are rearranged to produce two new molecules. Reactant 1 has a mass of 12 g. Reactant 2 has a mass of 23 g. The mass of product 1 is 15 g. The mass of product 2 is _____.
Based on the law of conservation of mass, the mass of product 2 is 10 g
What is the law of of conservation of mass?The law of conservation of mass explains why matter is constant for any change.
The law of conservation of mass states that matter is conserved in any change.
This means that the sum of mass before and after the change is constant.
In the given reaction:
Sum of reactants = 12 + 23 = 25 g
Mass of product 2 = 25 - 15 = 10 g
Therefore, the mass of product 2 is 10 g.
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Answer: 20
Explanation: i took the test
how are decomposers in a forest and kelp forest ecosystem similar and different)
4. What is the equation for Boyle’s Law? (1pts)
5. Use the equation for Boyle’s Law to explain what happens to the pressure of a compressed gas tank if you remove all of the gas from a 5 L tank and put it into a 1 L tank. Assume that temperature is constant. (2pts)
6. Use the equation for Boyle’s Law to calculate the following. (2pts)
A piston chamber, like a car engine, is filled with 1.00 L of nitrogen gas at 325kPa. The piston is compressed to a volume of 0.25 L.
What is now the pressure inside of the piston chamber? (Assume no gas leaked out).
The equation for Boyle's Law is: P1V1 = P2V2. According to Boyle's Law, the pressure of a gas is inversely proportional to its volume, assuming that the temperature and amount of gas are constant. The equation for Boyle's Law is: P1V1 = P2V2. Therefore, the final pressure inside the piston chamber after compression is 1,300 kPa.
What is Boyle's Law?Boyle's Law is a gas law that describes the inverse relationship between the pressure and volume of a gas while keeping the temperature and amount of gas constant. It can be expressed mathematically as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, respectively, and P2 and V2 are the final pressure and volume, respectively.
Hence, the equation for Boyle's Law is: P1V1 = P2V2. According to Boyle's Law, the pressure of a gas is inversely proportional to its volume, assuming that the temperature and amount of gas are constant. The equation for Boyle's Law is: P1V1 = P2V2. Therefore, the final pressure inside the piston chamber after compression is 1,300 kPa.
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What is the law of fossil succession?:
(8th Grade Science)
(Earth History)
(Layers & Layers of Rocks)
Different Fossil organisms succeed one another to go up through the different rock layers in a definite and determinable order. Therefore, any time period can be recognized by its fossil content
Explanation:
Different Fossil organisms succeed one another to go up through the different rock layers in a definite and determinable order. Therefore, any time period can be recognized by its fossil content
A balanced chemical equation is a direct presentation of the ___________.
Answer:
The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side.
Explanation:
How do you balance equations?
In general, however, you should follow these steps:
1. Count each type of atom in reactants and products.
2. Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances.
3. Repeat steps 1 and 2 until the equation is balanced.
What ions are formed when naoh is dissolved in water?.
Answer:
When NaOH dissolves into water, it dissociates into two ions: a positively charged sodium ion and a negatively charged hydroxide ion (OH-). The increased number of hydroxide ions in the solution increases the concentration of hydroxide ions in the water.
Explanation:
Hope it helps ^^
Brock wants to see a full cycle of one high tide to the next. About how long will Brock have to wait?
Answer:
5 minutes because he is good guy
Consider this reaction: NH4 HPO42− → NH3 H2PO4− Which is the conjugate base? NH4 NH3 HPO42– H2PO4–.
The conjugate base has been the proton acceptor in the chemical reaction. The conjugate base in the given reaction has been [tex]\rm HPO_4^{2-}[/tex].
What is a chemical reaction?The chemical reaction has been the reaction in which the change in the reactant resulted in the product with distinctive properties.
The given reaction has been:
[tex]\rm NH_4\;+HPO_4^{2-}\;\rightarrow\;NH_3\;+\;H_2PO_4^-[/tex]
In the given reaction, the ammonia has been the proton donor, while [tex]\rm HPO_4^{2-}[/tex] has been the proton acceptor. Thus, the conjugate base in the reaction has been [tex]\rm HPO_4^{2-}[/tex]. Thus, option C is correct.
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Answer:
Keep it simple: B
Explanation:
1. Identify the correct product to the following reactants.
HCI + NaOH->
a. NaH + COOH
b. NaCl + H2O
C. NaCl(OH)
what's an exothermic reaction-_-
Answer:
An exothermic reaction is a reaction in which heat is libberated or given off to the surroundings.
Explanation:
Example: neutralisation reaction.
Explain why Mineral water is a mixture
minerals are disbursed through the water
Explanation:
say you have a bottle of water and you leave it in a car when you go in to a store you come back and you see some particles in the water well that's mixture water is made of minerals so when it says the particles so when the mix the minerals get disbursed through out the water and they become invisible. that's why minerals water is a mixture
What part of a plant contains the gametes?
A. Stem
B. Leaf
C. Flower
D. Root
2. Which part of a flower below are both male reproductive structures?
A. Stigma and style
B. Style and ovary
C. Anther and filament
D. Stigma and anther
3.
What is the part of a flower that produces the male reproductive cells (pollen)?
A. Anther
B. Stigma
C. Style
D. Ovule
4. Brightly colored parts of flowers that attract insects are called?
A. Petals
B. Pistils
C. Sepals
D. Stamens
5.
What part of the flower will turn into a seed if fertilized by a pollen grain?
A. Ovary
B. Stigma
C. Stigma
D. Pollen
6. What part of a flower turns into fruit around a fertilized seed?
A. Ovary
B. Ovule
C. Stigma
D. Pollen
7. Which part of the plant collects/absorb water?
A. Leaves
B. Flowers
C. Roots
D. Stems
8.
What is the root's function in a plant?
A. Absorb water and sunlight
B. Give off oxygen
C. Make sugar and absorb water
D. Anchor the plant to ground and absorb water
9. What part of the plant makes food by photosynthesis?
A. Leaves
B. Flowers
C. Roots
D. Stems
10. Which of the following is the correct sequence in the image below, for pollination from
beginning to end?
A. ACBDFE
C. ABCDEF
B. CBDAFE
D. CBDFEA
Answer:
7.C or D not sure
Explanation:
its just a opinion :3
Which microscopic detail affects the strength of different forms of silk? (1 point)
O Different types of silk are in long strands or in other very different arrangements.
O Different silk strands are made with different types of atoms.
O Different types of silk do not have the same strength if they come from different sources.
O Different silk strands have different combinations of amino acids.
Answer:
Different types of silk do not have the same strength if they come from different sources.
Explanation:
Different Spiders will gave different webs. I hope this helps <3
Answer:
Different silk strands have different combinations of amino acids.
Adding boron to molten glass: ___________
a. Makes the glass much harder
b. Makes it more stable to rapid temperature changes Has no effect on glass
c. Makes the glass more liquid like so that it flows
d. Adds a greenish tint to the glass
Answer:
b
Explanation:
cause if so it like more stable when the molten part thing happened
How many moles of carbon tetrachloride are produced when 4.63 mol of carbon reacts with
excess chlorine? Complete and balance the equation for this chemical reaction first.
Answer:
4.63 moles of CCl4
Explanation:
C + 2Cl2 = CCl4
The balanced equation tells us that we'll obtain 1 mole of CCl4 for every 1 mole of C, assuming we have 2 or more moles of Cl2 (which we do in this problem).
Therefore, if we start with 4.63 moles of C, we'll produce 4.63 moles of CCl4
Answer please :) really needed
Who know how to do this♀️
4L of a solution contains 80.Omoles of solute, what is the molarity? (show all work)
What happens to the air as it warms up?
It rises.
It sinks down.
Its temperature decreases.
It turns into clouds.
What is the mass of an object that is moving at 8.0 m/s and has 70.0 J of kinetic energy?
Explanation:
[tex]ke = \frac{1}{2} \times m \times {v}^{2 } \\ m = \frac{2 \times ke}{ {v}^{2} } \\ m = \frac{2 \times 70.0}{ {8}^{2} } \\ m = \frac{140}{64} = 2.1875[/tex]
Hope its clear,
have a wonderful day♡♡
Which of the following is TRUE about limiting and excess reactants?
A
The reactant that has the largest given mass will be the excess reactant
B. The excess reactant will be completely consumed after the reaction is complete.
CO The limiting reactant determines the maximum amount of product that can be formed,
D
Some of the limiting reactant is left over after the reaction is complete,
Which statements are true of solutions? They contain solutes and solvents. They always have only one solute per solvent. Their particles must be evenly distributed. They are homogeneous matter. They are pure.
The solution contains solute and solvents, have evenly distributed particles, are homogenous and can include solid, gas and liquid in them together.
What are the solutions?The homogenous substance composed of a mixture of two or many substances in it is called a solution. The solute is the substance that can be liquid, solid or gas that gets dissolved in it.
The solvent is another substance in which the solute gets dissolved to produce a solution. The particles of the solute and the solvent are evenly dispersed in the solution.
Therefore, the solution is a homogenous mixture.
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Answer:
A. They contain solutes and solvents.
C. Their particles must be evenly distributed.
D. They are homogeneous matter.
Question 2:
Which statements are true of heterogeneous mixtures? Check all that apply.
They settle out.
They exhibit the Tyndall effect.
Their solutes and solvents appear as one.
They exhibit Brownian motion.
They are evenly distributed mixtures.
Answer:
A. They settle out.
B. They exhibit the Tyndall effect.
D. They exhibit Brownian motion.
Explanation:
edge, have a lovely day <3
Which materials are made with specialized molecules that act like a lock and key? (1 point)
liquid crystal displays
pharmaceuticals
metal frames on cars
fiber optic cables
Answer:
pharmaceuticals
Explanation:
pharmaceuticals
The answers to this quick check are as follows:
1.B- one made of a different metal that will not rust
2.B- It is made of polymers that are very flexible.
3.D- the ability to reflect electromagnetic waves
4.B-The atoms can slide past each other while still remaining attracted to each other electrically.
5.B-pharmaceuticals
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