Answer:
salt sodium chloride (NaCl)
hen an ambulance/cop car is approaching you, the siren has a high pitch because...
p.s THIS IS SCIENCE
Answer:
Explanation:
name an appropriate drying agent for hydrogen gas
Answer:
Sjjejwhsshw
Explanation:
Sssskeo1jshi1bdi kwn ieni, nei, nei nei nei neox3nixnec
Name two ways lead(pb) seeped into soil.
Answer:
through water
Explanation:
2. Explain the relationship between the key terms in
each of the following pairs.
a. direct pressure and indirect pressure
b. goal and action plan
If someone who look up to does anything that makes you want to do something, this is known as direct pressure directly from the other person's mouth. The plan you use to accomplish the goal it your activity.
Describe pressure.The Standard unit for pressures seems to be the pascal (Pa), which is equal to one newton / square meter (N/m2) of pressure is defined of surface. An object's pressure is inversely related to its force and proportional to both
Why does pressure exist?Pressure is created by molecules moving quickly and crashing into the container's walls. The quantity and intensity of molecular collisions in a given region determine the pressure there.
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Some plants can reproduce both sexually and asexually. Explain one benefit of this dual reproduction capability.
NO LINKS
Answer:
An additional advantage of asexual reproduction is that colonization of new habitats may be easier when an individual does not need to find a mate to reproduce. During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents.
Explanation:
An organism has many benefits for having the ability to reproduce both sexually and asexually. The first of these benefits is that it doesn't have to find a mate in order to reproduce, so it can create offspring by itself, and enable the continuation of its' species.
If you need more help on this subject, don't be afraid to ask me. I'm willing to help.
How do you most effectively increase the buffering capacity of a pH 4.9 buffer containing acetate (pKa 4.76)
A conjugate base solution with a pH between 8 and 10 has little buffer capacity, however at higher pHs, the strong base's presence begins to matter more.
Because of the large concentration of H + cations, a pure acetic acid solution with a pH below 3 already has a pH that is resistant to changes. This is because the concentration of the capacity is so high that it is unaffected by changes in the equilibrium of the solution brought on by the concentration of other ions. Why is a buffer more effective if its pKa is close to the pH? Why does a buffer function best when pH and pKa are equal? Why does increasing the pH by a basic or an acid.
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Which technology is NASA developing that will help astronauts reach Mars? Corona Freedom Orion Skylab
Answer:
The answer is "Orion technology"
Explanation:
NASA tested that perhaps the abort system on the Biomechanical properties fires faster than that of the rocket, possibly costing colonists during launch or a crisis. It test is a significant step forward in Agency's plans again for the Artemis space mission, which will pave the way for human missions to The moon. NASA is building a humanoid spacecraft for long-range space missions for the first time in generations. As just a result, they are beginning a new age of space travel. Orion would be used to transport the crew into space as a surveillance vehicle. Also, it helps astronauts to flights and ensures a safe return to orbit in the case of an emergency release.
Answer:
oRgiN
Explanation:
i jUST TOOK THE TEST
Who first identified the element radium? charles richard drew enrico fermi jonas salk marie curie
Marie Curie is credited with the discovery of radium. In 1898, she and her husband Pierre Curie discovered the element while experimenting with pitchblende, an ore containing uranium. They isolated a new substance, which they named radium, after the Latin word for ray.
What is uranium?Uranium is a naturally occurring element that is found in rocks and soil. It is a dense, silvery-white metal that has the highest atomic weight of all elements. Uranium is slightly radioactive and produces energy when it undergoes nuclear fission. It is an important source of energy generation and is used in nuclear reactors to produce electricity. Uranium also has a variety of other uses, such as in military applications, medical imaging, and industrial processes. It is a nonrenewable resource, and its supply is limited. Due to its radioactive nature, uranium must be handled with caution and special safety precautions must be taken to protect against the radiation it
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Answer: its D- Marie Curie
Explanation: I got it right on the test! hope this helps :)
Are CO2 and O2 inversely related?
Yes carbon dioxide and oxygen are inversely related to each other.
Bohr effect is a result of the effect of carbon dioxide has on hemoglobin affinity for oxygen. Bohr's effect describes the hemoglobin's lower affinity for oxygen secondary to increases in the partial pressure of the carbon dioxide and decreases the pH of blood. This lower affinity, in turn, enhances the unloading of oxygen into the tissues to meet the oxygen demand of the tissue.
Thus, the relationship between CO₂ and hemoglobin affinity for oxygen can be described as an inverse relationship meaning when one goes one way, and the other goes the other way.
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As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of the solution
The water solution gets hotter when an ionic solid dissolves in it. Entropy increases and there is a decrease in enthalpy change.
The spread of the solute molecules (and the thermal energy they carry) through the larger volume of the solvent during the dissolution of a solute typically results in a rise in entropy. When a liquid or solid dissolves in a solvent, entropy typically rises. Less negative entropy change is occurring (or perhaps even at this stage, positive). The chemicals will likely become more soluble as a result. The total result is a delicate balancing act between how the solution's enthalpy changes and how its entropy changes. When a substance is divided into several pieces, entropy rises. Entropy is raised via the disintegration process.
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Write a balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride.
Balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride is Na+ + F- → NaF
What is neutralization reaction?A neutralization reaction is a chemical reaction that occurs when an acid and a base react to form a salt and water. This type of reaction is exothermic, meaning that it releases energy in the form of heat. During a neutralization reaction, hydrogen ions from the acid are neutralized by the hydroxide ions from the base. The byproduct of this reaction is a salt and water. The salt produced depends on the acid and base used in the reaction, and the pH of the solution is neutralized to 7.0.
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6.6 moles of ZnO to molecules
Answer:
3.97e24
Explanation:
For every mol of any substance there are 6.02x10^23 molecules
so
6.6(6.02x10^23)= 3.97x10^24 Molecules of ZnO
Organic compounds form the basis of?
Answer:
1. carbon
Explanation:
carbon atoms bound to one another and other atoms by covalent bonds and found in the cells of living organisms. Hydrogen, oxygen and nitrogen are typical elements which, in addition to carbon, make up organic compounds.
How many moles of mercury (II) oxide are needed to produce 65.00 g of mercury?
Answer:
the moles of mercury are nHg = 65/201
HgO --------> Hg + 1/2O2
65/201 65/201
=> the moles of HgO are 65/201 mol
What is 0.151 g in scientific notation
Answer: Scientific notation- [tex]1.51 x 10^{-1}[/tex]
Explanation: I got this by moving the decimal, so that there is one non-zero digit to the left of that decimal point. Tip- The number of decimal places you move will be the exponent on the 10.
Moved right- Negative
Moved left- Positive
do you think a decomposer and detritivore would compete with each other? justify your answer (pls just type the answer) :)
Explanation:
I don't think a decomposer and detritvore would compete with each other because decomposers job is to break down dead, organic materials and detritvores feed on dead organisms
LPG consists of mainly
A. methane, ethane and hexane
B. ethane, hexane and nonane
C. methane, hexane and nonane
D. methane, butane and propane
D. methane, butane and propane
Propane and butane are both types of alkane hydrocarbons with relatively low boiling points, which allows them to be easily converted to a liquid form at relatively low pressures. This makes them easy to transport and store. Methane, ethane, and hexane are also alkane hydrocarbons, but they are not typically found in large amounts in LPG.
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Consider the reaction.
NH4HS(s)⇌NH3(g)+H2S(g)
At a certain temperature, Kc=8.5×10−3. In a reaction mixture at this temperature containing solid NH4HS, [NH3]=0.166 M and [H2S]=0.166 M. Will more of the solid form or will some of the existing solid decompose as equilibrium is reached?
In the reaction, NH4HS(s)⇌NH3(g)+H2S(g), more of the solid will form.
What is equilibrium?In a chemical reaction, equilibrium is the state where both the reactants and products are present in concentrations which have no further tendency to change with time, so there is also no observable change in the properties of the system. This state results when forward reaction proceeds at the same rate as reverse reaction.
If Q= K then equilibrium
Q>k, then reversed direction shift
Q<k, then forward direction shift
Given, Kc=8.5×10−3
Given [NH3]=0.166 and M [H2S]=0.166 M
Here Q= 0.166 M (given)
It shows Q> k that is 0.166 > 8.5×10−3
Therefore, more of the solid will form.
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Which argument supports the claim that dissolving calcium chloride (CaCl2) in water is a chemical change
The argument that supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change is A. The ionic bond among calcium and chloride ions has been broken..
When solid calcium chloride is added to water, the ionic bonds between the calcium ions (Ca2+) and chloride ions (Cl-) are broken apart by the polar water molecules. The calcium ions and chloride ions are then surrounded by the water molecules, forming a new chemical compound called calcium chloride hydrate (CaCl2*xH2O) which is different from the original solid calcium chloride. This process is a chemical change because it creates new substances and the original chemical bonds are broken and new bonds are formed.
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the complete question is:
Which of the following arguments supports the claim that dissolving calcium chloride (CaCl2) in water results in a chemical change?
A. The ionic bond among calcium and chloride ions has been broken.
B. By evaporating the water, the solid calcium chloride can be recovered.
C. The ions found in the solid remain in the solution and have not changed.
D. Ions are attracted by the polar water molecules.
A study of the spectrum of the sun led to the discovery of helium.
True False
Answer:
True
hope this helps
have a good day :)
Explanation:
Answer:
True
Explanation:
A study of the spectrum of the sun led to the discovery of helium.
Which of the following elements can be isolated by electrolysis of the aqueous salt shown? O Phosphorus from K3PO4 (aq) O Sodium from NaBr (aq) O Aluminum from AlCl3 (aq) O ch Fluorine from KF(aq) O lodine from Nal (aq)
The following elements can be isolated by electrolysis of the aqueous salt : Phosphorus from K3PO4 (aq).
What is electrolysis?Electrolysis is the method used to divide water into hydrogen and oxygen. An electrolyzer is a device where this process takes place.
In chemistry and production, the electrolysis method can be used to speed up a typically non-spontaneous chemical reaction. Electrolysis is significant from a business perspective as a phase in the electrolytic cell-based separation of elements from naturally existent sources like ores.
By introducing an electric current into a substance, electrolysis alters its chemical makeup. Depending on the substance, one electron is either lost or acquired during the chemical reaction (oxidation or reduction).
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plzz help mi chemists
Answer:
i) Iron metal is obtained
ii) Fe2O3 + 3CO → 2Fe + 3CO2
iii) CO is the reducing agent
Explanation:
i) When carbon monoxide is passed over iron III oxide, iron metal is obtained
ii) The equation of the reaction is;
Fe2O3 + 3CO → 2Fe + 3CO2
iii) The reaction is a redox reaction. CO acts as the reducing agent while Fe2O3 acts as the oxidizing agent. We know that CO is the reducing agent because its oxidation number increased from left to right. Recall that the oxidation number of the reducing agent increases from left to right in a redox reaction
In an atom that has lost an electron, the place vacated by the free electron is referred to as a(n)
The space left by the free electron in an atom after it has lost one electron is known as a hole.
The term "free electron" refers to an electron that has broken loose from its "parent" atom and is now free to move about the material at random. A vacancy, also known as a hole, is created in the atom when a bonded electron in a lattice atom breaks free. The number of electrons in an atom's valence shell, or n shell in this example, has a significant impact on the electrical properties of the element that the atom represents. The least force of attraction is felt by the electrons in the valence shell since they are the furthest from their nucleus.
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Electroplating is a way
to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. In essence the
metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution
Suppose a current of 0.490 A is passed through an electroplating cell with an aqueous solution of AgNO_3, In the cathode compartment for 90.0 seconds.
Calculate the mass of pure silver deposited on a metal object made into the cathode of the cell.
Be sure your answer has a unit symbol and the correct number of significant digits.
Answer:
0.049 g of Ag
Explanation:
From the question;
Ag^+ (aq) + e ----->Ag(s)
1 e = 96500 C
Note that Q= It
Where;
I = current and t= time taken
108 g of silver is deposited by 96500 C of electricity
x g is deposited by (0.49 * 90) C
x = 108 * (0.49 * 90) /96500
x= 0.049 g of Ag
N2 + 3H2 → 2NH3
How many moles of hydrogen, H2, are needed to react with 28 moles of nitrogen, N2?
(round the the tenth's place)
Taking into account the reaction stoichiometry, an amount of 84 moles of H₂ are needed to react with 28 moles of nitrogen.
Reaction stoichiometryIn first place, the balanced reaction is:
N₂ + 3 H₂ → 2 NH₃
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
N₂: 1 moleH₂: 3 molesNH₃: 2 molesMass of N₂ requiredIt can be applied the rule of three: If by reaction stoichiometry 1 mole of N₂ react with 3 moles of H₂, 28 moles of N₂ react with how many moles of H₂?
moles of H₂= (28 moles of N₂×3 moles of H₂)÷1 mole of N₂
moles of H₂= 84 moles
Finally, 84 moles of H₂ reacted.
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A certain solution contains 4.34.34, point, 3 grams of salt per liter. How much salt is there in 111111 liters of the solution
A certain solution contains 4.3 grams of salt per liter. the salt is there in 11 liters of the solution is 47.3 grams.
The solution contains = 4.3 grams salt per liters
in one liters the solution contains = 4.3 grams of the salt.
the salt in the 11 liters = ?
so, in one liter in contains = 4.3 grams
in 11 liters it will contains = 4.3 × 11
= 47.3 g
the round off answer to the solution is 47.3 g.
Thus the amount of the salt in the 11 Liters of the solution is the 47.3 g.
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How many atoms are there in a 2 moles of oxygen atoms? How many atoms are there in 2 moles of oxygen molecules?
There are 6.022 x 10^23 atoms in 2 moles of oxygen atoms. There are 2 x 6.022 x 10^23 atoms in 2 moles of oxygen molecules.
What is molecules?Molecules are the smallest particles of a substance that can exist on its own and retain the chemical properties of that substance. Molecules are composed of atoms that are held together by chemical bonds. Molecules can be composed of atoms of the same element, such as oxygen molecules that are composed of two oxygen atoms, or of atoms of different elements, such as water molecules composed of two hydrogen atoms and one oxygen atom.
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Identify the reactant, reagent, and solvent used to synthesize the alkyl lithium reagent shown. Reactant reagant --> solvent /\/\Li + LiBr
Identify the reagent. O 2 Li O CH3Li O LiOH
The reactant in the synthesis of the alkyl lithium reagent shown is an alkyl halide, likely represented by the structure //\Li + LiBr. The reagent used to synthesize the alkyl lithium reagent is lithium metal, represented by the structure O 2 Li.
The solvent used in the synthesis is not specified in the given information. It's common to use ethers such as diethyl ether or tetrahydrofuran as solvents in the synthesis of alkyl lithium reagents.It's worth noting that the structure O CH3Li is showing a methyl lithium reagent, which is a different compound than the alkyl lithium reagent shown in the first part of the question, and the structure LiOH is showing Lithium hydroxide which is not involve in the synthesis of alkyl lithium reagents.
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what type of bond is found in chlorine molecules
Answer: It is a Covalent Bond
Explanation:
In a chlorine molecule, the atoms bonded by a covalent bond as a chlorine atom needs one electron to complete its octet and shares one electron with another chlorine atom.
Answer:
mono covalent bonds
Explanation:
Cl shares 1 electron with another Cl atom
so it makes Cl2 a mono covalent compound
True or False: invasive species are native species that do no cause economic or environmental harm to the ecosystem.
Answer:
False
Explanation:
They do cause harm.