Answer:
ITS A 25% trust me
Answer:
I think it is 25%
Explanation:
PLEASE HELP!!! GIVING MOST BRAINLIEST
Answer:
Funnel and filter paper
Explanation:
the balance of it just balances things out, the beaker and flask will only help you with the measuring , and the watch glass is to see different things clearer.
Answer: Funnel, filter paper
Explanation: The balance of it just balances things out. The beaker and flask will help you with the measuring. The watch glass is to see different things objects clearer.
Hope this helps : )
Why are alloys useful?
Answer:
Yes, they are useful.
Explanation:
They allow us to make use of strengths and benefits of a particular element while not being hampered by it's faults.
A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been___
The cycling of carbon between the living and non-living parts of the Earth system is an important result of which of the following processes?
a. Herbivores digesting plant material to get nutrients
b. Plants and animals exchanging gases with the atmosphere
c. Condensation of water vapor leading to cloud formation
d. Methane entering the atmosphere from volcanic activity
Answer:
b. Plants and animals exchanging gases with the atmosphere
Explanation:
You are trying to dilute antifreeze to put in your car. You use 1.00 L of the antifreeze with a concentration of 9.24 M. You add water until the volume is 3.00 L. What is the molarity of the diluted antifreeze solution?
Answer:
1 x 9.24 = 3m. Solve m is 3.08M
Brainlist pls!
PLISSSSS!!! HELP ME ASAP.. NEED TO HAND IT IN TODAY
GIVING BRAINLIEST FOR THE BEST ANSWERS
Explanation:
This is for The first one. Í need some time for The second part. I'll send it by today
How does the difference in electronegativity values determine the type of bond that occurred? Ionic or covalent
1
Identify how many Sulfur atoms are in the product of this chemical
equation *
BaSO4 + H2SO4
Ba(HSO4)2
O A. 2
O B.4
O C. 8
O D. Unknown
Answer:
2
Explanation:
Equation of reaction
BaSO₄ + H₂SO₄ → Ba(HSO₄)₂
From the above equation of reaction, it is evident that there are 2 atoms in the product side of the reaction which is only logical because every chemical reaction obey the law of conservation of mass which states that matter can neither be created nor destroyed but can changed from one form to another.
In the reactant side, we have 2 atoms of S from the two reactants coming together.
One sulfur atom from BaSO₄ and the other from H₂SO₄. So therefore, only 2 sulfur can be produced since the reaction has to observe law of conservation of matter
RIGHT NOW PLEASE
Polar vs nonpolar molecules definitions.
Answer: Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
Explanation:
1What is one major difference between fossil fuels and biofuels?
ABurning fossil fuels releases greenhouse gases; burning biofuels releases no greenhouse gases incorrect answer
B Fossil fuels exist in unlimited supply; our supply of biofuels may run out someday incorrect answer
C Fossil fuels are very expensive to manufacture; biofuels are very inexpensive to manufacture incorrect answer
D You can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel
The major difference between fossil fuels and biofuels is you can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel. The correct option is D.
What are fossil fuels?A fossil is a naturally extracted fuel, for example, the anaerobic decompression of buried dead animals, while biofuel is any biomass fuel, plant or algae, or animal waste. Since these materials can quickly be replenished, biofuels are considered renewable energy sources.
Biofuels are created from renewable feedstocks, unlike fossil fuels, which are finite resources. As a result, their manufacturing and use might theoretically continue forever.
Therefore, the correct option is D. You can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel.
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Which of the following statements is a testable hypothesis for an experiment
that compares wild horses and tame horses?
Answer:
Explanation:
There are many different testable hypothesis and experiments that can be made in order to prove this. Since there are no available statements let me provide one.
Testing and Comparing the excrement of wild and tamed horses.
This is because the excrement of tame horses will show higher levels of man-made chemicals and additives due to the different man-made horse food that the owners are giving them. Wild horses on the other hand will not since they nourish themselves on naturally grown grass.
The teeth of wild horses wear down faster than the teeth of a tame horse.
5 stars?
You have just started working at a swimming pool supply store and they have nitric acid on their shelves. In order to help customers adjust the pH of their swimming pool you must know many details about this chemical. Due to air conditioning the store is always at 25 degrees Celsius. The label on the nitric acid bottle is marked as 0.0155 mol/L. What is the hydronium ion concentration?
Answer:
The concentration of hydronium ions is 0.0155 mol/L
Explanation:
The aqueous solution ionization reaction for nitric acid is as follows;
HNO₃ + H₂O → NO₃⁻ + H₃O⁺
Whereby HNO₃ is a strong acid and it undergoes complete ionization in an aqueous solution
Hence one mole of HNO₃ produces one mole of H₃O⁺ ions
0.0155 mol/L HNO₃ will have 0.0155 moles of H₃O⁺ in one liter of the solution
The concentration of hydronium ions = 0.0155 mol/L.
A weather balloon has a maximum volume of 6.25 x 10^3 L. The balloon contains 510. L of helium gas at a pressure of 0.882 atm. What will be the pressure when the balloon is at maximum volume?
A 72.0 atm
B .0720 atm
C 2,811,375 atm
D 22.4 atm
Answer:
0.0720 atm
Explanation:
Boyle's Law
How much energy is released when 22.4g of CH4 is burned?
The combustion of methane, CH4, releases 890.4 kJ/mol. That is, when one mole of methane is burned, 890.4 kJ are given off to the surroundings. This means that the products have 890.4 kJ less than the reactants.
Combustion of one mole or 16 g of methane gas releases 810 kJ of heat energy. Thus, heat released by the combustion of 22.4 g of methane is 1134 kJ.
What is combustion?Combustion of a substance is its reaction with atmospheric oxygen producing carbon dioxide and water. Combustion of hydrocarbons gases takes places easily and can be burned easily for fuels.
The chemical equation of combustion of methane is written below:
[tex]\rm CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex]
This is an exothermic process and heat is released from the reaction system.
The heat released by the combustion of one mole of methane is 810 kJ.
molar mass of methane = 16 g/mol
no.of moles in 22.4 g = 22.4/16 = 1.4 g
Thus, heat released by 1.4 moles = 1.4 ×810 kJ =1134 kJ.
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Convert 22.7 grams of H2O to molecules
Answer: 1.2600414759026783 mol
Explanation:
Un elemento posee dos isótopos cuyos números de masa suman 68 y la semisuma de sus neutrones es 19. Determine el grupo de este elemento en la Tabla Periódica Actual.
Answer:
The element belongs to group 15 of the present periodic table
Explanation:
Isotopes have the same proton number, what differs is that they have different number of neutrons.
Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.
Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30
Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15
The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table
can u answer this?
Mass: 126 g
Volume: 15 cm to the third power
Density:?
Answer:
Calculate density
Weight/mass
126
g
Volume
15
cm³
Density
8,400
kg/m³
Explanation:
A leaf preserved in hard transparent material is found in:
Answer:
would be fossiled amber I think
Answer:
It would be a fossilized amber
Explanation:
After millions of tons of pressure is applied on the leaf, the carbon in the leaf is forced into a transparent like material
Beginning with interphase, use the letters to order the following events:
A prophase
B telophase
C metaphase
D interphase
E anaphase
Answer:
D, A, C, E, B
Interphase, Prophase, Metaphase, Anaphase, Telpohase
elements in the periodic table are listed in order of their -----
Answer:
In numerical order left to right, they are arranged by the number of protons in the nucleus of a single atom of each element
Answer:They are in order of their increasing atomic number
A 1,000-mL sample of ethanol is tested. Its boiling point is determined to be 78.4°C. What is the most reasonable prediction of the boiling point for a 100-mL sample of ethanol?
Answer:
78.4°C
Explanation:
Boiling point does not depend on the mass of the substance present, only the heat content is a function of the mass or volume of the substance in consideration. If there is 1000 ml of ethanol and it boils at 78.4°C, a 100 ml sample too should boil at the same temperature of 78.4°C.
explain how iodine can be obtained from iodine-sodium chloride mixture
Identify whether each of these hydrocarbons is saturated or unsaturated. Place an "S" for "saturated" next to each hydrocarbon letter that is saturated. Place a "U" for "unsaturated" next to each hydrocarbon letter that is unsaturated.
A. 2 central carbons, with C H 3 at each end, and also single bonded to the first carbon.B. 3 central carbons, with the first 2 double bonded to each other. The left end is bonded to C H 3, and the right end is bonded to 3 C H 3.C. 2 central carbons, with H above, below, and to both sides.D. 5 central carbons, with H above and below each, and H and to both ends of the chain.
ANWSERS:
A. ⇒ S
B. ⇒ U
C. ⇒ S
D. ⇒ S
You're welcome >:D
Answer:
A = S
B = U
C = S
D = S
Explanation:
Among the given compounds, compounds (A), (C) & (D) are saturated hydrocarbons and compound (B) is an unsaturated hydrocarbon.
What is hydrocarbons?Hydrocarbons are those compounds in which carbon atom is present in addition to the hydrogen atoms.
Saturated compounds are those compounds in which only single bonds are present between two carbon atoms.Unsaturated compounds are those compounds in which double or triple bonds are present between two carbon atoms.So, according to the data given in the question it is clear that compound (A), (C) and (D) are saturated compounds as in these only single bonds are present and compound (B) is an unsaturated compound because of the presence of the double bonds.
Hence only compound (B) is an unsaturated compound.
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Use the drop-down menus to identify the type of mass movement in each image. Grass covered land with a large depressed area. Muddy water is rushing across a roadway. Dirt and fallen trees cover a roadway.
Answer: First one is slump, then mudflow, then landslide.
Explanation:
Just got it right on e2020
Answer:
First one is slump, then mudflow, then landslide.
Explanation:
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any object that travels around another object in space is a (n) -
Answer:
The answer is Satellite
Explanation:
H2SO4 + 2NaOH - Na2SO4+ 2H20
In a titration, 5.0 ml of 1.0 M H2SO4 solution is neutralized by 8.0 ml of an NaOH solution of unknown
concentration. The concentration of the NaOH is -
OA 2.0 M
OB 1.0 M
OC 0.63 M
OD 1.3 M
Answer:
It takes 83 mL of a 0.45 M NaOH solution to neutralize 235 mL of an HCl ... 2). You are titrating an acid into a base to determine the concentration of the base. The endpoint of the neutralization is reached but the stopcock on the buret sticks slightly ... 5). It takes 12.5 mL of a 0.30 M HCl solution to neutralize 285 mL of NaOH ...
Explanation:
you are given element x. what should you do to identify the element.
(Sains)
Flexible expenses _________ from month to month.
A.
vary
B.
increase
C.
decrease
D.
remain unchanged
Answer:
A
Hope this helps.
Answer:
A. vary
Explanation:
Water is treated at a water works to make it fit to drink. What is present in the water when it leaves the waterworks?
Answer:
Supplements and disinfecting chemicals
Explanation:
The major stages of water treatment are; coagulation, sedimentation, filtration and disinfection. Coagulation has to do with adding a coagulant such as potash alum which causes the impurities to clump together and form big particles called flocs. These settle down rapidly under gravity and the water is passed through a filter bed to remove fine particles. The water is now disinfected by the addition of chemicals such as chlorine. Supplements such as iodine and flourine may also be added to the water.
Contact process is operated at low pressure high temperature and V2O5 are conditions required for the contact process. The contact process is used to produce sulphuric acid from sulphur.
When the water leaves the waterworks, there has been the presence of chlorine as well as soluble substances. The reaction has been processed by utilizing Vanadium oxide as a catalyst, at low pressure and high temperature. Thus option D is correct.
Water has been made to work with the waterworks to make it fit for the drinking purpose. The process removes the access of contaminants from the water, by removing the toxins water has been made suitable for drinking purposes.
The disinfectants have been added to the water to chemically treat the water at waterworks. Chlorine has been the chemical widely used for disinfection purpose. Thus, when the water leaves the waterworks, there has been the presence of chlorine as well as soluble substances such as minerals that made water suitable for drinking.
The contact process has been the modern process used by the industries for the manufacturing of Sulfuric acid. The process has been a catalyze-mediated reaction in which there has been the formation of sulfur trioxide intermediate by the reaction of sulfur dioxide and oxygen. The reaction has been processed by the dissociation of sulfur trioxide to sulfuric acid on reacting with water.
The reaction has been processed by utilizing Vanadium oxide as a catalyst. The reaction has been processed at low pressure and high temperature. Thus option D is correct.
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Which reaction model represents a nuclear fission reaction?
A → B + C + n
A + C → B + n
A → B + C
n + A → B + C + n
Answer:
n + A → B + C + n
Explanation:
When a neutron hits the nucleus of an atom, the nucleus splits into two fragments of equal mass and emits two or three neutrons.