Answer: The indivisible unit of matter.
Explanation:
Which of the following can be said about the boiling point of a liquid?
Explanation:
Boiling point
It is the temperature at which liquid changes into gaseous state .
or it can be defined as :
the temperature at which the vapor pressure of a liquid becomes equals to atmospheric pressure .
It depends upon many factors :
Temperature Pressure Inter molecular forces present Environmental pressure or vapor pressureTemperature : more is the temperature , more is the vapor pressure hence more is the boiling point .
Pressure : More is the pressure , ore is the boiling point or vice versa .
Intermolecular forces in particles of matter : more are the forces , less is the boiling point as they will have no escaping tendency .
The boiling point of water is : 100 degree celsius
5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a volume of 15.3 cm3. Were the coins gold (d= 19.3 g/cm3) or just yellow brass (d= 8.47 b/cm3)?
Answer:
Therefore the coins were of yellow brass.
Explanation:
A sample weighted 129.6 g and had a volume of 15.3 cm³.
[tex]Density =\frac{mass }{volume}[/tex]
Here mass= 129.6 g and volume =15.3 cm³.
[tex]Density =\frac{129.6}{15.3}[/tex] g/cm³
=8.47 g/cm³
Given that the density of gold = 19.3 g/cm³
and density of yellow brass = 8.47 g/cm³
Since the density of the sample is equal to the density of yellow brass.
Therefore the coins were of yellow brass.
The density of the coins sampled is 8.47 g/cm3, which is the same as the density of brass and much less than the density of gold, 19.3 g/cm3. The coins are therefore made of brass not gold.
Explanation:To determine if the coins are gold or brass, you need to calculate the density of the sample and compare it to the known densities of gold and brass. The density can be calculated by dividing the mass by the volume.
So, density = mass/volume = 129.6 g / 15.3 cm3 = 8.47 g/cm^3.
The density of the sample is identical to the density of brass, 8.47 g/cm^3, and much less than the density of gold, 19.3 g/cm3. Therefore, the coins are made of brass not gold.
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a knitting pattern for a blanket requires 1531 yards of yarn. A 2.00 x 10^2 m hank of speciality yarn cost $7.99. how much would it cost to make the blanket out of this yarn? (1 yard = o.9144 m)
Answer:
$55.998
Explanation:
Given data:
Total yard in blanket = 1531 yard
Price of 2.00×10² m = $7.99
Total cost for blanket = ?
Solution:
As it is given in question that,
1 yard = 0.9144 m
1531 × 0.9144 m = 1399.95 m
Total number of meters = 1399.95 m
Price of 2.00×10²(200) m = $7.99
Cost of one meter:
$7.99 / 200m = 1 m / x
x = $0.04
Now we will calculate the price of 1531 yard,
1399.95 m × $0.04 / 1m = $55.998
To make the blanket requiring 1531 yards of yarn using a speciality yarn sold in 200 meter hanks priced at $7.99 each, it would cost $55.93 after converting yards to meters and calculating the number of hanks needed.
The cost of making a blanket using the given yarn, we need to convert the required yarn from yards to meters to match the unit in which the speciality yarn is sold. Then, we can determine how many hanks of yarn are needed and calculate the total cost.
Conversion of Yards to Meters
Firstly, we convert the needed yarn for the blanket from yards to meters using the conversion factor 1 yard = 0.9144 meters.
1531 yards * 0.9144 meters/yard = 1400.0844 meters
Calculating the Number of Hanks Needed
Now, we calculate how many 2.00 x 102 meter hanks are required:
1400.0844 meters / (2.00 x 102 meters/hank) = 7 hanks (rounding up since you can't purchase a fraction of a hank)
Total Cost Calculation
Finally, the total cost is:
7 hanks * $7.99/hank = $55.93
Therefore, it would cost $55.93 to make the blanket out of this speciality yarn.
The crust below the oceans is _____. thicker than the crust below the continents made of basalt and salt sediment made of sedimentary rock made of granite thinner than the crust below the continents
The crust below the ocean and ocean floor is thinner than the crust below the Earth's continents.
Answer:
it is filled with basalt
Explanation:
How is a new moon the same as or different from a total lunar eclipse
Explanation:
Both new moon and lunar eclipse occur when the moon is in the same plane the sun and the earth. However, both are different because of the relative position of the moon in its orbit – relative to earth. In a new moon, the moon is in between the earth and the sun, while in a lunar eclipse, the earth us in between the moon and the sun.
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Answer:
A new moon and lunar eclipse occur when the moon is in the same plane as the earth and the sun. The moon is between the earth and the sun on a new moon. The earth is between the moon and the sun on a lunar eclipse.
Explanation:
Which two elements in group 14 on the periodic table most likely to be malleable and good conductors of electricity
Answer:
Tin & Lead
Explanation:
They are metals and can conduct electricity because their outer electrons are not localized, i.e., they are not bound to specific atoms.
The energy level of electrons in the "conduction band" overlaps that of valence electrons. These electrons are more like a cloud dispersed throughout the piece of metal so that when an electric field is applied, they can move around.
The two element in 14th group of periodic table most likely to be malleable and good conductors of electricity are lead and tin. They are mostly existing in metallic state.
What are conductors ?Conductors are materials that can easily pass electricity through it at normal temperature. Metals are all good conductors. In addition metals have some peculiar features such as malleability, ductility, luster etc.
14th group elements are carbon family. In this group, carbon at normal temperature exists as gas. Silicon and germanium are semiconductors. Lead and tin are metallic in nature and they are malleable as well.
Lead and tin can be shaped and sized as desired and they are used in various electronic devices also because they are good conductors at metallic state. Therefore, tin and lead are the two elements.
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Which of the statements describes a chemical property?
Iodine(a purple solid) become a purple gas.
Helium is the lightest monatomic element.
Antacid tablet’s neutralize stomach acid.
Water freezes at 0 c.
Final answer:
Antacid tablets neutralizing stomach acid represents a chemical property, as it describes the substance's ability to undergo a chemical change and form different substances.
Explanation:
The statement among the given options that describes a chemical property is 'Antacid tablet’s neutralize stomach acid.' This statement describes the ability of a substance to undergo a specific chemical change. A chemical property involves a substance's ability to convert into a different substance, which is what antacid tablets do when they interact with stomach acid to produce salt and water, neutralizing the acid.
In contrast, the other statements describe physical properties: Iodine sublimating from a solid to a gas is a physical change because it changes state but does not become a new substance; helium being the lightest monatomic element describes its physical characteristic; and water freezing at 0°C is a physical change because it changes the state from liquid to solid without altering the chemical composition.
How many moles of chromium (lll) nitrate are produced when chromium reacts with 0.85 moles of lead (IV) Nitrate to produce chromium (lll) nitrate and lead?
Answer:
1.133 moles of chromium (lll) nitrate are produced.
Explanation:
[tex]4Cr+3Pb(NO_3)_4\rightarrow 4Cr(NO_3)_3+3Pb[/tex]
Moles of lead(IV) nitrate = 0.85 mole
According to recation, 3 moles of lead(IV) nitrate gives 4 moles of chromium (III) nitrate.
Then 0.85 moles of lead(IV) nitrate will give:
[tex]\frac{4}{3}\times 0.85 mol=1.133 mol[/tex] of chromium (lll) nitrate.
1.133 moles of chromium (lll) nitrate are produced.
the change in state from a solid to a liquid is called
Answer:
melting
Explanation:
Witch is the best example of natural selection ?
A . Some insects in a population survive temperature changes and pass their traits on to their offspring
B . A deer population is rapidly killed off by a forest fire.
C. A few mice from population randomly die from a disease, while surviving mice are not able to reproduce and slowly die off.
D. An injured bald eagle is captured and placed in a wildlife where it survives for 10 years
How many atoms are there in NaCI
which compound of gold will produce the least mass of gold?
1)Gold(I) oxide 3)Gold(I)sulfide
2)Gold(III) oxide 4)Gold(III)sulfide
Au₂S₃
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = [tex]\frac{394}{410}[/tex] x 100 = 96.1%
Mass percentage of gold in Au₂S = [tex]\frac{394}{426}[/tex] x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = [tex]\frac{394}{442}[/tex] x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = [tex]\frac{394}{490}[/tex] x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
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Answer:
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = x 100 = 96.1%
Mass percentage of gold in Au₂S = x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
The probability of finding electrons in certain regions of an atom is described by?
orbits.
orbitals.
quanta.
photons.
Answer:
orbits
Explanation:
An orbital is a region of space where there is a high probability of finding an electron.
what other animals do you know about that have unique forms of self defense
Answer:
there are certain spiders with some pretty weird/ cool self defense techniques
What is the change of state that occurs in the condenser
Answer:
Explanation:
The high temperature refrigerant passes into a condenser coil. As the vapor refrigerant travels through the coil, air from a fan passes over the coil to cool the vapor refrigerant. As the vapor cools it condenses and becomes a liquid, which is referred to as a change of state.
Many fuels, such as gasoline and diesel fuel, are hydrocarbons. Hydrocarbons are molecules that contain only hydrogen and carbon. Choose all of the criteria below that would make a hydrocarbon a good fuel in terms of enthalpy.
A Hydrocarbons burn to absorb a large amount of energy.
B Burning hydrocarbons produces a lot of energy.
C Breaking carbon-hydrogen and carbon-carbon bonds gives off energy.
D The enthalpy of combustion is a large negative value.
Answer:
Its B, C, and D.
Look at photo for proof.
A hydrocarbon would be a good fuel in terms of enthalpy if it produces a lot of energy when burned and has a large negative enthalpy of combustion. The correct option is (B).
Explanation:In terms of enthalpy, a good fuel would be one that releases a large amount of energy when burned. This means that burning hydrocarbons should produce a lot of energy (option B).
Breaking carbon-hydrogen and carbon-carbon bonds in hydrocarbons actually requires energy, so it doesn't contribute to the enthalpy of combustion (option C).
The enthalpy of combustion is defined as the heat released when one mole of a substance is burned completely in oxygen. Since the combustion of hydrocarbons releases a large amount of heat energy, the enthalpy of combustion is a large negative value (option D).
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Scientists use the properties of seismic waves to figure out the structure of Earth's interior. For example, seismic waves travel faster through denser layers than through less dense layers. Also, P waves can travel through both solids and liquids, but S waves can travel through solids only.
Because P and S waves travel faster through the Earth's mantle than through Earth's crust, scientists know that the mantle is _______ and _______ than the crust.
A.
solid; less dense
B.
solid; denser
C.
liquid; less dense
Answer:
Solid; denser
Explanation:
As light travels from air to water to gas
Avogadro defined one mole of carbon-12 atoms to have a mass of exactly 12.0 grams. Calculate the number of hydrogen atoms in 1 mole.
A) 1.38 x 1025 atoms
B) 1.66 x 1024 atoms
C) 3.98 x 1023 atoms
D) 6.02 x 1023 atoms
The term mole concept is used here to determine the number of hydrogen atoms in one mole. The number of 'H' atoms in one mole is 6.022 x 10²³ atoms. The correct option is D.
What is mole?One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The number of entities present in one mole of a species equals 6.022 x 10²³ . This value is called the Avogadro number.
The Avogadro number also called the Avogadro constant. It is represented as N₀. One gram atomic mass of any element contains Avogadro number of atoms. The number of atoms in 12 g of C-12 is also 6.022 x 10²³.
1 gram atom of hydrogen (i.e., 1.008 g) contains Avogadro number of atoms.
Thus the correct option is D.
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Final answer:
One mole of any substance contains Avogadro's number of particles. Hence, 1 mole of hydrogen atoms contains 6.02 x 10^23 atoms.
Explanation:
The question asks to calculate the number of hydrogen atoms in 1 mole. Avogadro's number, defined as the number of particles in 1 mole of a substance, is 6.022 x 1023 particles/mole. This principle is based on the standard that 1 mole of carbon-12 atoms has a mass of exactly 12.0 grams and contains 6.022 x 1023 carbon atoms. Given that 1 mole of any substance contains the same number of entities as there are in 1 mole of carbon-12, one mole of hydrogen atoms, regardless of its lesser mass compared to carbon-12, also contains exactly 6.022 x 1023 atoms. Therefore, the correct answer is D) 6.02 x 1023 atoms.
How efficient are electric engines
Answer:
Electric engines have efficiencies of roughly 90% whilst combustion engines about 10% to 30%. This is because combustion engines emit much more heat, which is always energy that is not used as work, and thus increases inefficiency.
Explanation:
in the name, iron(III) oxide, the (III) represents
A) the number of iron atoms
B) the number of oxygen atoms
C) the electrical charge of oxygen
D) the electrical charge of iron
To attain stability the chemical bond is formed .
Chemical bond
It is a kind of linkage that binds one atom with the other .
The atoms do so in order to attain stable noble gas configuration .
To form chemical bond they either:
Loose electrons : when atoms loose electrons they acquire positive charge which is equal to the number of electrons lost .
Gain electrons: After gaining electrons they acquire negative charge which is equal to the number of electrons gained by an atom.
share electrons : With sharing no charges are develop .
In the above asked question when iron combines with oxygen it forms iron oxide : where iron looses 3 electrons and oxygen gains 2 electrons .That is the reason ,III here represents the electrical charge of iron
What’s number 5? C7H6O2+02–>CO2+H20
Answer: If you were asking for it to be balanced then its 10 C7H602 + 70 O2 = 70 CO2 + 301 H20
Explanation: i hope this helped you
Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CO + O2 → CO2
Answer:
2co + o2 > 2co2
Explanation:
so that is tye answer
Answer:
CO + O2 → CO2
To balance the equation, the atoms of elements on the left side must equal the atom of same element on the right side.
To balance the equation, put 2 in front of CO and 2 in front of CO2 as illustrated below:
2CO + O2 → 2CO2
The coefficients are 2, 1, 2
what is the name of Fe(OH)3
Answer:Iron(|||) Hydroxide
Explanation:Fe is iron and OH is hydroxide
Final answer:
Iron(III) hydroxide is the name of the compound Fe[tex](OH)_{3}[/tex], a reddish-brown precipitate formed by iron in the +3 oxidation state combining with hydroxide ions.
Explanation:
The compound with the chemical formula Fe[tex](OH)_{3}[/tex] is known as iron(III) hydroxide. It can also be referred to as ferric hydroxide. This compound is formed when iron ions in the +3 oxidation state (Fe³⁺) combine with hydroxide ions (OH⁻) in a 1:3 ratio, resulting in the reddish-brown precipitate that is represented by the formula Fe[tex](OH)_{3}[/tex]. The chemical reactions provided, such as Fe(OH)₃ (s) + 3Na⁺ (aq) + 3NO₃⁻(aq), highlight the chemical processes involving iron(III) hydroxide in various contexts. In the case of FeCl₃(aq) + NaOH(aq), when a solution containing iron and a hydroxide is mixed, a precipitate of iron(III) hydroxide forms along with the resulting sodium chloride.
what is the equation form of the ideal gas law?
Answer:
The equation of state of n gram-moles of a perfect gas can then be written as pv/t = nR, in which R is called the universal gas constant.
Explanation:
Answer:
PV=nRT
Explanation:
Tissue engineering is beneficial for which of the following reasons?
A.Stem cells are more powerful than any device.
B.Stem cells are stronger than any other material.
C.Stem cells automatically create a perfect organ shape and size.
D.Using a patient's own cells increases the likelihood of biocompatibility.
Tissue engineering is beneficial as stem cells automatically create a perfect organ shape and size, therefore, here option C is correct.
What is tissue engineering?Tissue engineering is a biomedical engineering discipline that coordinates science with engineering to make tissues or cell items outside the body or to utilize acquired information to more readily deal with the maintenance of tissues inside the body.
Numerous new cell treatments are being fostered that make difficulties for designing tissue capability.
The execution of cell treatments and unions in the facility requires the acknowledgment and goal of a few troublesome issues.
Tissue engineering is beneficial as, stem cells automatically create a perfect organ shape and size, hence option C is correct.
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The Calvin cycle converts ATP and NADPH to
a0
Answer:
The Calvin cycle converts ATP and NADPH to "convert CO2 to sugar".
Explanation:
When carbon dioxide reaches inside the leaf through pores called stomata in plants and spreads to the chloroplast stroma, it act as the location of Calvin cycle reactions where sugar is naturally produced.The light-independent processes are also called such reactions as they are not primarily guided by light.
The Calvin cycle processes can be separated into three main channels: carbon fixation, reduction, and starting molecule's regeneration as explained below:
Carbon Fixation: Six-carbon compound are generated in this step that bifurcate into two molecules (three-carbon compound) 3-phosphoglyceric acid (3-PGA), catalyzed by the enzyme rubisco or RuBP carboxylase/oxygenase.Reduction: In this phase of the cycle 3-PGA molecules are converted into glyceraldehyde-3-phosphate (G3P) i.e three-carbon sugar by using ATP and NADPH.Regeneration: Many G3P molecules are used to generate glucose, while others have to be recycled to recreate the acceptor RuBP.CH4 + O2 - CO2 + 2H2O
Pick a one world factor to describe the benefits and limitations of Bromine
A one world factor to describe the benefits and limitations of Bromine are water purification compound.
Explanation:
Benefits of bromine
Bromine is used to make organobromo compounds. Dibromoethane is an agent for leaded gasoline, largely stepped out due to environmental considerations. In fire extinguishers, pharmaceutical products and insecticides, organobromines are used. Bromine applied in dyes production, water purification compounds, fumigants, sanitizes, medicinal, photography, flame proofing agents. In citrus beverages, bromine used as emulsifier.Limitations of bromine
Organic bromines are used as protecting and disinfecting agents, because microorganisms has its damaging effect. Once it is used in greenhouses and on farmland they can easily wash off to surface water, which has negative health effects on algae, daphnia, lobsters and fishes. The animals effected on DNA damage and nerve damage which can leads to development of cancer. Organic bromines can damage organs such as kidneys, liver, lungs. Ethylene bromine can cause cancer.
CARBON DIOXIDE DOES NOT EXIST IN A LIQUID STATE
UNTIL THE PRESSURE IS AT LEAST 5.1 ATMOSPHERES.
CONVERT THIS PRESSURE TO a) TORR, AND b) kPa.