CAN SOMEONE PLS HELP PLS
an isotope of phosphorus contains 19 neutrons. construct the symbol for the isotope.
Answer:
Explanation:
The isotope Al-27 has 13 protons and 14 neutrons. Aluminium's average atomic mass is 26.981539 AMU
Most earth sciences specialize in studying one aspect of the planet true or false
Answer:
oil & mining are big in earth sciences
Answer:
false
Explanation:
there are lot of aspects of Mars that they are disconcerting still like scientists get paid a lot because of that astronomers get paid a lot because of that also.
write and balance the equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide
The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :
FE2O3 + 3CO → 2FE +3CO2
Two moles of iron with three moles of carbon dioxide gas are produced when one mole of iron(iii) oxide reacts with three moles of carbon monoxide
A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.
The mass and charge is equal in a balanced chemical reaction.
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What is the average atomic mass of a sample of Calcium, if you have 37
atoms of Calcium-40 and 10 atoms of Calcium-41?
The calculated answer is 40x2/6.023x10²³
Calcium is a mineral that is most frequently linked to strong bones and teeth, but it also plays a critical role in blood clotting, assisting with muscular contraction, and regulating regular heartbeats and nerve activity. Calcium has a 40g molar mass (mass of 1 mole). I'm assuming that all you're looking for is the mass of two calcium atoms, which is incredibly little:
A mole of calcium weighs 40g and contains 6.023 x 10²³ atoms.
There would be 1.328x10-22 g of calcium if 2 calcium atoms have a mass of 40x2/6.023x10²³.
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What is the function of an organ system?
a. to work together to do a specific job
b. to be a basic unit of organization with bodies
c. to organize a group of similar cells
d. to control movement in internal organs
Answer:
A
Explanation:
eg digestive system consists of ma y organs working towarss the break down of large insoluble food molecules
Answer:
A is the answer
Explanation:
Upon combustion, a compound containing only carbon and hydrogen produces 3.54 g CO2 and 1.09 g H2O. Find the empirical formula of the compound.
The empirical formula of the compound is CH₃
What is the empirical formula of the compound?The empirical formula is determined as follows:
Given the general equation of the combustion of hydrocarbons as follows:
CxHy + O₂ → x CO₂ + y H₂O
mass of CO₂ produced = 3.54 g
molar mass of CO₂ = 44 g/mol
moles of C in the sample = 3.54/44 = 0.08 moles
molar mass of C = 12 g/mol
mass of C in the sample = 0.08 * 12 = 0.96 g
mass of H₂O produced = 1.09 g
molar mass of water = 18 g/mol
moles of H in the sample = 1.09 /18 * 2
moles of H in the sample = 0.12 moles
Ratio of C : H = 0.08 : 0.12
Ratio of C : H = 1 : 3
Therefore, the empirical formula of compound = CH₃
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When looking for a mathematical relationship between two variables use a
When looking for a mathematical relationship between two variables use a line graph.
What is a mathematical variable?
A mathematical variable is one that can be found by the use of algebra or by a the use of graph. We know that a line graph involves plotting the independent variable on the horizontal axis and the dependent variable on the vertical axis.
The relationship between the two variables can be determined by studying how much the data set suits a particular equation of line of best fit or by considering the correlation coefficient of the scatter plot.
Hence, when looking for a mathematical relationship between two variables use a line graph.
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Missing parts;
When looking for a mathematical relationship between two variables, use a _____.
A. line graph
B. circle graph
C. bar graph
D. data table
Which is an example of a homogeneous mixture?
A. Apple juice
B. Vegetables soup
C.Pure Gold
D. H2O (water)
Answer:
H2o water is correct please mark as brainliest
list some characteristic properties that distinguish the metallic elements from the nonmetallic elements
The metals are malleable and ductile, which means that they can be beaten into sheets and can be given any desired shape while the nonmetals are brittle and soft. Metallic elements are considered as good conductors of electricity and heat while nonmetallic elements are poor conductors. Metals are lustrous while nonmetals are nonlustrous.
A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile (can be drawn into wires) and malleable (they can be hammered into thin sheets).
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Start with solid argon and explain how to make argon change to the liquid state and then to the gaseous state
Starting with solid argon at room temperature, we need to cool it to -189.2 c to convert it into the liquid state.
Then, we need to heat it slightly till it reaches a temperature of -185.7 c. At this temperature, the liquid argon will convert into gaseous argon.
There are three states of matter i.e, solid state, liquid state, and gaseous state. These states are interconvertible which means that we can convert a substance from one state to another.
The conversion from solid to liquid and then gas or vice versa happens at specific temperatures that are known as boiling point, melting point, freezing point, etc.
The melting point is the temperature at which a solid gets converted into a liquid.
The boiling point is the temperature at which a liquid gets converted into a gas.
The melting and boiling points of Argon are -189.2 °C and -185.7 °C respectively.
Thus, starting with solid argon at room temperature, we need to cool it to -189.2 °C to convert it into the liquid state.
Then, we need to heat it slightly till it reaches a temperature of -185.7 °C. At this temperature, the liquid argon will convert into gaseous argon.
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Find the distance between the two points rounding to the nearest tenth (if necessary). ( 8 , − 5 ) and ( 1 , 1 )
The distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.
What is the distance between two points?
The distance between two points is calculated using the following equation.
for a given points (x1, y1), (x2, y2), the distance, d is;
d = √[(x2-x1)² + (y2 - y1)²]
From the given question;
x1 = 8, y1 = -5
x2 = 1, y2 = 1
distance = √[(1-8)² + (1 - -5)²]
distance = √[(-7)² + (16)²]
distance = 9.22 units
Thus, the distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.
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molecules of i2 are produced by the reaction of 0.4321 mol of cucl2 according to the following equation. 2 cucl2 4 ki → 2 cui 4 kcl i2
[tex] \: 1.237 \times 10^{23} molecules \: of \:I _{2} \: are[/tex]
[tex]are\: produced \: and \: 53.74 \: g \: of \: I _{2} \: are[/tex]
produced from the reaction.
The overall balanced equation for the reaction is,
[tex]2CuCl_{2} + KI→2CuI + 4KCl + I_{2}[/tex]
[tex]Number \: of \: moles \: ofCuCl_{2}=0.4235 \: mol [/tex]
[tex]2 \: moles \: of \: CuCl_{2} \: produce \: \: 1 \: mole \: [/tex]
[tex]of \: I_{2}.[/tex]
[tex]2 \: mole \: of \: CuCl_{2} = 1 \: mole \: of \: I_{2}[/tex]
[tex]1 \: mole \: of \: I_{2} \: = 6.022 \times 10 ^{23} \: molecules \: of I_{2}[/tex]
So, the number of molecules produced in the reaction of
[tex] I_{2} \: are[/tex]
[tex] = \frac{0.4235 \times 6.022 \times 10 ^{23} }{2 } [/tex]
[tex] = 1.237 \times 10^{23} \: molecules \: [/tex]
[tex]1.237 \times 10^{23} \: molecules \: of \: I_{2} \: are \:[/tex]
produced from the reaction.
[tex]Mass \: of \: I _{2} \: produced \: are \: is ,[/tex]
[tex] = \frac{0.4235 \times 253.8}{2} [/tex]
[tex] = 53.74 \: g[/tex]
[tex] 53.74 \: g \: of \: I _{2} \: produced \: in \: the \:[/tex]
reaction.
[tex]Therefore , \: 1.237 \times 10^{23} molecules[/tex]
[tex]of \: I_{2} \: are\: produced \: and \: 53.74 \: g \: of[/tex]
are produced in the reaction.
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4. Indicate whether entropy increases or decreases in each of the following situations. a. The jigsaw puzzle is taken apart and put back in the box. b. Clothes are folded and put away. c. Ice turns into steam
Answer:
Entropy generally increases when a reaction produces more molecules than it started with.
Explanation:
a. The jigsaw puzzle is taken apart and put back in the box. entropy decreases
b. Clothes are folded and put away. entropy decreases
c. Ice turns into steam. entropy increases
What is entropy?Entropy is the measurement of the amount of heat energy per unit of temperature in a system that cannot be used for productive labor. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
Entropy theory offers profound understanding of both the direction underlying spontaneous development for many commonplace events.
a. The jigsaw puzzle is taken apart and put back in the box. entropy decreases
b. Clothes are folded and put away. entropy decreases
c. Ice turns into steam. entropy increases
Therefore,
a. The jigsaw puzzle is taken apart and put back in the box. entropy decreases
b. Clothes are folded and put away. entropy decreases
c. Ice turns into steam. entropy increases
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Which statement about one atom can definitively tell you the identity of the element? a. The atom has 1 proton. b. The atom has 2 neutrons. c. The sum of the number of protons and neutrons in the atom is 3 d. The difference between the number of neutrons and protons in the atom is 1.
Answer: 2(B)
Explanation: It's a little confusing to read but from my understanding it's 2 because the atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons
1.1 Which of the following statements is FALSE? As the temperature of the gas in the container increases,... A the molecules move more quickly. B the molecules expand. C the molecules collide more often. D the molecules move further apart.
Answer:
d is false
Explanation:
because when the Temperature of gas in the container increases the molecule increases or expands and collide
Does the mean molecular speed change as much as the temperature as the water heats up? Explain.
For each degree of temperature change, the mean molecular speed increases by about 1 m/s. At 100 °C, the mean molecular speed is about 17% faster than at 0 °C.
What is temperature ?Temperature is a numerical expression of how hot (or energetic) stuff or radiation is.
There are three different types of temperature scales: those, like the SI scale, that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body; those that only depend on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particulates rather than by theoretical principles.
Using a thermometer, one can gauge temperature. It is calibrated using different temperature scales, each of which historically defined itself using a different set of reference points and thermometric materials.
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URGENT!! What is the consequence of carbon's unique bonding ability?
It can only bond with a select few elements.
It is very rarely found in molecules.
Only one carbon atom can be present in a molecule at a time.
It forms the basic building blocks of organic molecules.
It forms the basic building blocks of organic molecules this is the carbon's unique bonding ability
Carbon is an essential building block of organic molecules. this is because it has a unique molecular structure that allows it to form many strong bonds with itself and other crucial elements and it is typically combined with hydrogen to form hydrocarbons and hydrocarbons can have single, double, or triple bonds between carbon atoms. carbon atoms can form four covalent bonds and it make strong bond because any molecule are formed with carbon so is does't found rarely in molecule and only one carbon is not present in molecule at a time there are so many carbons are present
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Which is not an advantage of using the pyramid of energy? a. It takes into account the rate of production over a period of time. B. Assigning the decomposers and detritivores to a particular trophic level. C. There are no inverted pyramids. D. The input of solar energy can be added. Please select the best answer from the choices provided a b c d
Pyramid of energy has not an advantage: B. Assigning the decomposers and detritivores to a particular trophic level.
Pyramid of energy is a graphical representation of the amount of energy at each trophic level of a food chain (see the picture below).
The bottom level represents the producers, followed by primary, secondary and tertiary consumers.
The decomposers and detritivores do not have a particular trophic level.
Decomposers break down dead plants and animals into simpler inorganic substances.
Detritivores are organisms, for example a fungus or an earthworm, that are decomposing organic matter.
Decomposers have very important role in the circle of life.
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Answer:
b. Assigning the decomposers and detritivores to a particular trophic level.
Explanation:
Help :/
can someone explain to me how you solve this
Use atom economy to argue which of these processes may be greener.
By the principle of atom economy the second process is more efficient.
What is atom economy?We know that the atom is the smallest particle of a substance that could take part in a chemical reaction. We are also aware that all compounds are composed of atoms and that a chemical reaction has to do with the rearrangement of atoms in such a way that be products could be formed.
In this case, we know that an organic product may be obtained in a sequence of reactions and the atom economy is very important in the nature of the process that is being carried out. Let us now take good look at the two processes that could be shown.
In the first process, we can see that there are a lot of products that could just be classified as side products and does not have a real relevance to the final products. In the second process, we have only one waste product and that is water.
As such, by the principle of atom economy the second process is more efficient.
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ASAP
Calculate density
Mass = 23.6 g
Volume = 30.0 cm³
O
O
0.79 g/cm³
54 g/cm³
1.3 g/cm³
6.4 g/cm³
Answer:
Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).
Find out the volume of an object. In our example, it's 200 cm3 .
Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3
Optionally, change the unit.
Explanation:
draw the diazonium cation formed when cytosine reacts with nano2 in the presence of hcl. cytosine reacts with n a n o 2 and h c l. cytosine is a 6 membered ring consisting of a nitrogen bonded to a hydrogen at position 1, a carbon double bonded to oxygen at position 2, and a nitrogen at position 3 that is double bonded to the carbon on position 4. there are carbons at positions 5 and 6 and they are double bonded to each other. lastly, the carbon in position 4 has an nh2 substituent.
When cytosine reacts with NaNO2 and HCl to form Diazonium salt.
What is Diazonium salt?Diazonium salt or diazonium compounds are defined as the group of the organic compounds which sharing a common functional group [R−N⁺≡N]X⁻ where R is any organic group, like an alkyl or an aryl, and X can be an organic or inorganic anion, like a halide.
As we know that, Cytosine is a 6 membered ring consisting of
a nitrogen arom is bonded to a hydrogen at position 1. a carbon is doubly bonded with the oxygen present at position 2.and a nitrogen which is at position 3 that is doubly bonded with the carbon at position 4. There are carbons at positions 5 and 6 and these are doubly bonded with each other. Lastly, the carbon in position 4 has an NH2 substituent.Thus, we concluded that the cytosine reacts with NaNO2 and HCl to form Diazonium salt.
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What is the process that wears away the surface of the earth?
Answer:
erosion
Explanation:
erosion is when the top layer of the earth gets slowly worn away bhy water and ither stuff.
the temperature of the mesosphere is much higher than the asthenosphere overall, but yet is is still a ductile solid. what keeps it from melting?
The temperature of the mesosphere is much higher than the asthenosphere overall, but yet is is still a ductile solid. The thing that keeps it from melting is high pressure.
What is the mesosphere?The mesosphere plays a crucial role in protecting the earth. Most meteors and asteroids are destroyed by the mesosphere before they can impact the earth's surface.
An area of the Earth's atmosphere is called the mesosphere. Directly above the stratosphere and beneath the thermosphere lies the mesosphere. It covers a distance of 31 to 53 miles, or 50 to 85 kilometers, above our planet. The mesosphere's temperature falls with height.
It should be noted that this high pressure that keeps it solid in form and does not let it melt down.
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The temperature of the mesosphere is much higher than the asthenosphere overall, but yet is is still a ductile solid. what keeps it from melting?
Cool temperature
Distance from the sun.
High pressure
Low pressure
HELP ME PLEASE THIS IS SCIENCE ITS DUE SOON ONG lol
Which of these is the largest?
a chromosome
a cell
a gene
Answer:
A gene
Explanation:
A gene because you carry those traits from your parents and you keep passing those to your offsprings.
slove this...........................
Explanation:
................easy ngl
Answer:
for protons going down it is:
(already given)
6
6
8
8
17
17
for neutrons going down it is:
6
7
8
(already given)
10
18
20
for electrons going down it is:
6
6
8
8
(already given)
17
Explanation:
bascially the number of protons is the bottom number to the left and the number of electrons is the same as the number of protons and the number of neutrons is basically the mass number (the top right one) minus the proton number
hope this helps:)
A car is driving down a road. Is it possible for its position to be changing and its acceleration to be zero? Is it possible for its velocity to be changing and its accelera- tion to be zero? Explain.
Answer:
Yes. As soon as acceleration disappears, the object just continues with whichever speed it has. The acceleration changes speed; is there no acceleration, then speed is constant.
Explanation:
What causes the element name to change (grade 9 Science)?
a sample of blood is found to contain 64.5 micrograms of valproic acid. how many milligrams of valproic acid does this blood sample contain?
The valproic acid contains 0.0645 milligrams
Conversion scale1000 microgram = 1 milligram
Data obatined from the questionFrom the question given, the following data were obtained:
Mass (in micrograms) = 64.5 microgramsMass (in milligrams) =?How to convert 64.5 micrograms to milligramsWe can convert 64.5 micrograms to milligrams as illustrated below:
1000 microgram = 1 milligram
Therefore,
64.5 micrograms = (64.5 micrograms × 1 milligram) / 1000 microgram
64.5 micrograms = 0.0645 milligrams
Thus, the valproic acid contains 0.0645 milligrams
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Calculate the heat energy released when 29. 5 g of liquid mercury at 25. 00 °c is converted to solid mercury at its melting point. Constants for mercury at 1 atmheat capacity of hg(l) 28. 0 j/(mol⋅k) melting point234. 32 kenthalpy of fusion2. 29 kj/mol
0.3271 kJ is the heat energy released when 29. 5 g of liquid mercury at 25. 00 °c is converted to solid mercury at its melting point. Constants for mercury at 1 atmheat capacity of hg(l) 28. 0 j/(mol⋅k) melting point234. 32 k enthalpy of fusion 2. 29 kj/mol
First convert the temperature into kelvin.
25.00°C+273.15=298.15K
Now convert the hear capacity into J/g.K
28.0(j/mol.K)×1mol/200.59g
=0.1396J/g.K
Now calculate the hear transferred using the specific heat of mercury
q=mcΔT
q=(29.5g)0.1396J/gK)(234. 32 -298.15 K)
q=-262.85 j = -0.26286 Kj
The calculation would involve the enthalpy of fusion, but with a negative sign.
(29.5g Hg)(1mol/200.59g Hg)×-2.29Kj/mol= -0.064221 Kj
Add the heat transferrers of both process together
-0.26286 Kj-0.064221 Kj = -0.327081
The total heat released is 0.3271 kJ.
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a. Write chemical formula of copper (I) oxide, iron (III) carbonate, and magnesium sulfate
b. Calculate the proportion by mass of the elements in each compound.
(Given: M(Cu) = 64 M(Fe) = 56 M(S) = 32 M(Mg) = 24 M(O) =16 M(C) = 12)
Chemical Formula : It is the method of showing the information about the chemical proportion of atoms of a given element.
Types of Chemical Formula : There are three types namely
1. Molecular
2. Empirical
3. Structural
a. The chemical formula of the given compound asked in the problem are :
i. Copper (II) oxide - CuO
ii. Iron (III) Carbonate - Fe2(CO3)3
iii. Magnesium Sulphate - MgSO4
b. The proportion by mass of the given compound are :
i. CuO = Atomic mass of copper and oxygen are = 64 and 16
so, mass proportion = 64 / 16 = 4 : 1
ii. Iron Carbonate : = 14 :1
iii. Magnesium Suphate - 24 / 32 = 3:4
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