Answer:
Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
What volume does 0.25 moles of oxygen gas occupy at STP ?
Answer:
[tex]\boxed {\boxed {\sf 5.6 \ L \ O_2}}[/tex]
Explanation:
We are asked to find the volume of 0.25 moles of oxygen gas.
At standard temperature and pressure or STP, one mole of any gas has a volume of 22.4 liters.
We want to convert 0.25 moles of oxygen gas or O₂ to liters. We will use dimensional analysis, so we must set up a conversion factor.
[tex]\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
We are converting 0.25 moles of oxygen gas, so we multiply the conversion factor by this value.
[tex]0.25 \ mol \ O_2 *\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
The units of moles of oxygen gas cancel.
[tex]0.25 *\frac {22.4 \ L \ O_2}{1 }}[/tex]
[tex]0.25 * 22.4 \ L \ O_2[/tex]
[tex]5.6 \ L \ O_2[/tex]
0.25 moles of oxygen gas occupy 5.6 liters at standard temperature and pressure.
How to calculate work done with change in volume and pressure.
[tex]W = \displaystyle \int dW = \displaystyle \int^{V_2}_{V_1} p ~dV = p(V_2 - V_1) = p \Delta V[/tex]
PLEASE HELP!! 25 points!! Are these sentences true or false
1.) A machine with a mechanical advantage greater than 1 multiplies force
2.)A machine with mechanical advantage less than 1 multiplies distance
Answer:
True
Explanation:
Brainless if it helped
Hg2(NO3)2 + Na2CO3 = NaNO3 + HgCO3 balance this
Answer:
Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3
Why do metals form cations and nonmetals form anions?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Metals have tendency to loose electrons in order to get noble gas configuration, therefore they loose electrons to form Cations (positively charged ions)
for example ~ Sodium forms Na+
And
Non - metals have tendency to gain electrons in order to attain noble gas configuration , hence they gain electron from somewhere and bears a negative charge forming Anion.
for example ~ Chlorine forms Cl-
How to find electrons.
Answer:
The number of electrons is the atomic number
The letter for element Q stands for "qualium." What would the compound in 1a be called?
(1 A)
Answer:
ooooooooooo0000000000000
You have 505 mL of a 0.160 M HCl solution and you want to dilute it to exactly 0.100 M. How much water should you add
This problem is providing information about the volume and concentration of HCl as 505 mL and 0.160 M respectively, and it is asking for the water that have to be added to prepare a 0.100-M solution.
In such a way, we work over the assumption of constant moles in dilution processes, so that we are able to write:
[tex]M_1V_1=M_2V_2[/tex]
Which relates de volume and concentration at the beginning and end of the experiment. This means we can solve for the resulting volume of the solution as a first calculation:
[tex]V_2=\frac{M_1V_1}{M_2}\\\\V_2=\frac{0.160M*505mL}{0.100M}=808mL[/tex]
Hence, the following amount of water must be added:
[tex]V_w=808mL-505mL=303mL[/tex]
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https://brainly.com/question/5480904https://brainly.com/question/4357504.16 Unit Test: Chemical Bonding - Part 2 1. You are studying alkaline earth metals bonding with Halogens. Using your knowledge of the ionic bonding, what specific and testable scientific question could be asked about the salt formation
A testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
A scientific question is a question that can be answered by experiments. In other words, a scientific question must be empirical. Its answer can only be obtained by carrying out experiments.
In the case of bonding in alkaline earth metals, the kind of bond formed is ionic. Ionic compounds are soluble in water. Hence, a testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
This can be answered by dissolving several salts of alkali earth metals in water.
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What is the maximum number of electrons in the following energy level? n = 1
Maximum number of electrons in nth energy level
[tex]\\ \sf\longmapsto 2n^2[/tex]
Now
n=1Max electrons
[tex]\\ \sf\longmapsto 2(1)^2[/tex]
[tex]\\ \sf\longmapsto 2e^-[/tex]
What causes the electrons to move and form static electricty?
contact between two substances
friction
Moist air
Answer:
Static electricity is the result of an imbalance between negative and positive charges in an object. ... When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other.
Answer: 1) Contact between two substances.
Explanation:
#1 When fuel is running through pipes, there is a lot of contact between the fuel and the pipe.
To avoid explosions, fuel trucks have a metal chain that hangs to the ground to discharge the static. When a jet plane is being fueled up, it is first connected to a metal spike that is sunk down into the ground.#2 Before, people thought that Static at first was caused by friction, meaning the rubbing (of an object, pause) had something to do with static.
People later on noticed that fuel trucks and jet planes were being filled with fuel.A large static charge built up from the fuel running through the pipes when fuel trucks and jet planes were being filled with fuel.End note: Your welcome. My apologies if I was late, I was trying to find the answer to this question, too, until I got all this information while taking notes from my Physical Science lesson.
Which one of the following would form a precipitate when mixed with LiOH?
A) KNO3
B) NH4Cl
C) Ca(C2H3O2)2
D) ZnBr2
Answer:
ZnBr2
Explanation:
KNO3 + LiOH -------> no reaction
This is because KNO3 and LiOH completely ionize.in water and form neutral solutions.Since both are neutral no reaction occurs
NH4Cl + LiOH -----> NH3 (aq) + H2O (l) + LiCl(aq)
None of the above products are precipitates
Ca(C2H3O2)2 + 2LiOH -----> Ca(OH)2 (aq) + 2LiC2H3O2 (aq)
ZnBr2 + 2LiOH -----> Zn(OH)2 (s) + LiBr2 ( aq)
Zn(OH)2 thus formed is a white precipitate
However when excess LiOH is added Zn(OH)2 precipitate will dissolve to give a clear solution of Li2ZnO2 .
You can remember this by the fact that Na,K,Rb,Cs,Ca,Sr,Ba hydroxides are soluble in water and all other hydroxide are precipitated in water
Zn(OH)2 (s) + 2 LiOH ------> Li2ZnO2(aq) + 2 H2O ( l)
The only compound that will form a precipitate with LiOH would be ZnBr2
Precipitation reactionsThese are double displacement reactions in which precipitates are produced. Precipitates are insoluble solids formed from the combination of ions in aqueous solutions.
In this case, a reaction between LiOH and ZnBr2 would be as follows;
2LiOH + ZnBr2 ----------> 2LiBr + Zn(OH)2 (s)
Zn(OH)2 is an insoluble salt and will precipitate out in the solution.
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If pOH of the compound equals to 2, it shows that compound is *
Strong basic
Strong acidic
Weak acidic
Weak basic
What is the IUPAC name for N2O? mononitrogen dioxide dinitrogen monoxide nitrogen oxide nitrous oxide.
The IUPAC name for N2O is nitrous oxide.
The IUPAC name with the full meaning (International Union of Pure and Applied Chemistry) is a system of naming chemical compounds by chemical scientists.
The given IUPAC name to N2O is nitrous oxide. Nitrous oxide is commonly known as the laughing gas is a colorless gas with a pleasant, sweetish odor and taste that, when breathed, causes placidity to pain.
Nitrous oxide has several medicinal applications due to its anesthetic and pain-relieving properties, and it can be given by Medical professionals.
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What is the IUPAC name for N2O?
B. dinitrogen monoxide
What is the common name for N2O?
D. nitrous oxide
Which was the first ""cell"" viewed by the light microscope?microbeatomdnaoak bark.
Answer:
The cork cell
Explanation:
a hot air balloon is an example of what type of system ? an open system ? a closed system ? or a isolated system ?
Answer:
Also, hot air balloons are open systems—not closed, but again, the use of helium necessitates that the balloon be closed.
Explanation:
Answer:
open system
Explanation:
How does the structure of compounds determine the properties of the compounds?
Answer:
All of these properties are due to the chemical structure of the compound. The chemical structure includes the bonding angle, the type of bonds, the size of the molecule, and the interactions between molecules. Slight changes in the chemical structure can drastically affect the properties of the compound.
Explanation:
Hope it helps.
Please mark as brainliest.
What is the unabbreviated electron configuration for Neptunium?
Answer:
Please mark me as brainliest and also give me 5 start Thank you
Explanation:
The radioactive element neptunium (atomic number 93) has the electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p64f14 5d10 6s2 6p6 7s2 6d1 5f4
The noble gas form is
[Rn] 7s2 6d1 5f4
about how many bacteria colines will grow in a agar plate with a swab of ginger oil
about 6 to 9 colines
if its from mouth if thats the case
Will tin reduce iron?
Answer: The iron equilibrium is the more positive, and so will go in the forward direction. The tin equilibrium is less positive (more negative), and will be driven backwards. So the tin(II) ions will reduce iron(III) ions to iron(II) ions. In the process, of course, the tin(II) ions will be oxidised to tin(IV) ions.
Explanation:
Which parts must be balanced in a chemical equation?
The reactants and products parts of a chemical equation must be balanced.
What is a balanced equation?A chemical reaction is said to be balanced when the number of atoms of each element on both sides of the equation are the same.
A chemical equation consists of the reactants and the products, hence, the number of atoms on both sides must be equal for the equation to be balanced.
Therefore, the reactants and products parts of a chemical equation must be balanced.
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pls help! Two galaxies on opposite ends of the universe are moving away from the Earth. Each has a velocity of 200,000 km/s relative to the Earth. How fast would an observer in one of those galaxies see the other galaxy moving away?
A.200,000 km/s
B. between 300,000 and 400,000 km/s
c. between 200,000 and 300,000 km/s
D. 400,000 km/s
An observer in one of those galaxies see the other galaxy moving away at 400000 km/s.
Relative velocity is the velocity of an object with respect to another object, that is the time rate of change of relative position of one object with respect to another object.
Since two galaxy are moving in opposite directions with a velocity of 200,000 km/s. Hence the relative velocity between the two galaxies is 400000 km/s (200000 + 200000)
Therefore an observer in one of those galaxies see the other galaxy moving away at 400000 km/s.
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Answer:
D 400,000km/s
Explanation:
What did Democritus call small, indivisible particles that make up?
Answer:
atomos
Explanation:
2,500 years ago, Democritus suggested that all matter in the universe was made up of tiny, indivisible, solid objects he called "atomos." However, other Greek philosophers disliked Democritus' "atomos" theory because they felt it was illogical.
witch one is a gas metal or ion-----sodium, potassium, hydrogen, lithium
Answer: Lithium, sodium and potassium are in the same group, alkali metals or Group 1A, because the Periodic Table is arranged according to the Periodic Law which states that chemical properties repeat at regular intervals.
Explanation: hope it helps :)
The dissolved materials in seawater are thought to originate from chemical weathering of rocks on the continents and also from ________.
Answer:
outgassing of elements from earth's interior
Electrons are shared. Is it Ionic bond, covalent bond or both?
Answer:
covalent bond
Explanation:
ionic bond is when electrons are transferred by atoms not shared
A student has a sample of ocean water that they take to science class. what steps could be taken to determine to classify the ocean water as a suspension, solution, element, or compound?
A) Examine the pH of the sample. If the pH is exactly neutral, it is a pure substance that is a compound.
B) Evaporate the water. If salt is left behind, the sample is a mixture that can be defined as a solution.
C) Let the sample settle. If the salt settles to the bottom, it is a mixture that is classified as a solution.
D) Observe the diffraction of light as it moved through the sample. If light does not scatter, it is a pure substance that is elemental.
Answer:
A or D because B and C dont make sense
Notice that the bond strength for lithium bonded with any of the anions is larger than the bond strength of potassium bonded with any of
the same anions. Propose a scientifically sound explanation for this.
Select one:
O a. Lithium comes before sodium or potassium alphabetically, so its bond will be stronger.
O b. Sodium and potassium are essential for human metabolism, so they should not bond as strongly with anions.
Oc. Lithium is the smallest cation, so bond length is shorter creating a tighter bond.
Od Lithium is the only cation with a +1 charge.
Check
The bond strength for lithium bonded with any of the anions is larger than the bond strength of potassium bonded with any of the same anions because lithium is the smallest cation, so bond length is shorter creating a tighter bond.
The strength of an ionic bond ultimately depends on the size of the ions. The smaller the ions the stronger the bond and the higher the lattice energy. Such compounds having a high lattice energy tend to deviate from the normal behavior of ionic crystals due to significant covalent contribution.
Lithium is the smallest cation in group 1. Hence, the bond strength for lithium bonded with any of the anions is larger than the bond strength of potassium bonded with any of the same anions because lithium is the smallest cation, so bond length is shorter creating a tighter bond.
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Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________. the car driven governmental incentives for research the amount of fossil fuels that are invested in long-term storage the source of oxygen used for the process the source of energy used to produce the hydrogen
A hydrogen energy system is made up of hydrogen production, transportation, storage, utilization etc. Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on the source of energy used to produce the hydrogen.
Hydrogen fuel cells often makes electricity by using hydrogen and oxygen atoms. The hydrogen is said to reacts with oxygen across an electrochemical cell.Hydrogen is known to carry some amount of energy carrier and can also deliver or store a large amount of energy. Hydrogen is often used in fuel cells to generate electricity, or power and heat.
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how does water's structure explain its properties?
We know that water is tasteless, odorless, and transparent. In small quantities, it is also colorless. However, when a large amount of water is observed, as in a lake or the ocean, it is actually light blue in color. The blue hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. These and other properties of water depend on its chemical structure.The transparency of water is important for organisms that live in water. Because water is transparent, sunlight can pass through it. Sunlight is needed by water plants and other water organisms for photosynthesis.Chemical Structure of WaterEach molecule of water consists of one atom of oxygen and two atoms of hydrogen, so it has the chemical formula H2O. The arrangement of atoms in a water molecule explains many of water’s chemical properties. In each water molecule, the nucleus of the oxygen atom (with 8 positively charged protons) attracts electrons much more strongly than do the hydrogen nuclei (with only one positively charged proton). This results in a negative electrical charge near the oxygen atom (due to the "pull" of the negatively charged electrons toward the oxygen nucleus) and a positive electrical charge near the hydrogen atoms. A difference in electrical charge between different parts of a molecule is called polarity. A polar molecule is a molecule in which part of the molecule is positively charged and part of the molecule is negatively charged.
•Hydrogen Bonding-
Opposite electrical charges attract one another. Therefore, the positive part of one water molecule is attracted to the negative parts of other water molecules. Because of this attraction, bonds form between hydrogen and oxygen atoms of adjacent water molecules. This type of bond always involves a hydrogen atom, so it is called a hydrogen bond. Hydrogen bonds are bonds between molecules, and they are not as strong as bonds within molecules. Nonetheless, they help hold water molecules together.
•Sticky, Wet Water-
Water has some unusual properties due to its hydrogen bonds. One property is cohesion, the tendency for water molecules to stick together. The cohesive forces between water molecules are responsible for the phenomenon known as surface tension. The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. For example, if you drop a tiny amount of water onto a very smooth surface, the water molecules will stick together and form a droplet, rather than spread out over the surface. The same thing happens when water slowly drips from a leaky faucet. The water doesn't fall from the faucet as individual water molecules but as droplets of water.
•Density of Ice and Water-
The melting point of water is 0°C. Below this temperature, water is a solid (ice). Unlike most chemical substances, water in a solid state has a lower density than water in a liquid state. This is because water expands when it freezes. Again, hydrogen bonding is the reason. Hydrogen bonds cause water molecules to line up less efficiently in ice than in liquid water. As a result, water molecules are spaced farther apart in ice, giving ice a lower density than liquid water. A substance with lower density floats on a substance with higher density. This explains why ice floats on liquid water, whereas many other solids sink to the bottom of liquid water.In a large body of water, such as a lake or the ocean, the water with the greatest density always sinks to the bottom. Water is most dense at about 4°C. As a result, the water at the bottom of a lake or the ocean usually has temperature of about 4°C. In climates with cold winters, this layer of 4°C water insulates the bottom of a lake from freezing temperatures. Lake organisms such as fish can survive the winter by staying in this cold, but unfrozen, water at the bottom of the lake.
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