Answer:
The inhaling of oxygen and the exhaling of carbon dioxide. The process by which cells use oxygen to break down sugar and obtain energy is called respiration.
Can I get a rebuttal on why humans are better to send to space than humans.
Answer:
both are humans
Explanation:
so what on earth are you talking about?
Answer:
Do you mean why animals are better to send to space than humans? Animals do not comprehend what is going on so they are not worried or scared to die in space. They also do not have the same level of IQ as humans so humans are worth more if you saw it from that point of view. I know this can be debated however.
\\
Ok I see you posted a comment saying "Robots"
Robots will not die if there is an explosion because AI does not have a mind of it's own.
hello people ~
Which of the following can be beaten into thin sheets?
A. Zinc
B. Phosphorus
C. Sulphur
D. Oxygen
How many moles are in 2.3 g of NaHCO3? Answer should have 3 digits after the decimal and a unit.
Answer: 0.027 moles
Explanation:
Ecosystem 8L.3. 1-2 1 1 of 25
Which is the BEST example of a community responding to an external factor?
A. Plants and animals thrive on the forest floor after the fall of a white pine causes an opening in the canopy.
B. Many species of raptors fly alongside each other during the autumn migration to warmer climates.
C. Elephants use their tusks to dig the salt needed in their diets from the wall of a cave.
• D. Adult musk oxen in a herd surround their young to protect them from wolves.
Answer:
Adult musk oxen in a herd surround their young to protect them from wolves.
Answer:
D
Explanation:
4. Which of the following compounds is
molecular?
A. NaF
B. Al3PO4
C. CO2
D. KC1
Answer:
CO2(C)
Explanation:
This is because there is a mutual sharing of electrons between the atoms or elements...That's to say covalent bond exist between them.
4. Use the chemical equation to answer the question.
4K(s) + O2(g) → 2K2O(s)
The molar mass of potassium (K) is 39 g/mol. The molar mass of oxygen (O) is 16 g/mol. How many grams of potassium are needed in the reaction to produce 23.5 grams of potassium oxide (K2O)?
A 23.5 g
B 9.75 g
C 0.50 g
D 19.5 g
The amount, in grams, of potassium that would be needed to produce 23.5 grams of potassium oxide will be 19.5 grams
Stoichiometric calculationFrom the equation, the mole ratio of K to K2O is 2:1.
Mole of 23.5 K2O = mass/molar mass
Molar mass of K2O = 39x2 + 16 = 94
Mole of 23.5 K2O = 23.5/94 = 0.25 moles
Equivalent mole of K = 0.25 x 2 = 0.5 moles
Mass of 0.5 mole K = 0.5 x 39 = 19.5 grams
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Answer: Calculating mass quick check
1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g
4. 19.5 g
5. 853.5 g
You're welcome
The purpose of a titration, such as
that done in the hard water lab, is to
Answer:
to detect equivalence point.
Explanation:
the point at which chemically equivalent amounts of reactants have been mixed.
Propane burns according to the following reaction:
C3H8 + 5O2 → 3CO2 + 4H2O
What volume of carbon dioxide is produced if 25.0 m3 of propane at atmospheric pressure is combusted?
Answer:
Propane burns in air according to the following equation:
C
3
H
8
+5O
2
→3CO
2
+4H
2
O.
1 mole of propane combines with 5 moles of oxygen.
Volume is directly proportional to the number of moles.
1 cm
3
of propane will combine with 5 cm
3
of oxygen.
Only 20% of air contains oxygen. So 1000 cm
3
of air contains 1000cm
3
×
100
20
=200cm
3
of oxygen.
The volume of propane that is consumed on using 1000 cm
3
of air is
5
200cm
3
=40cm
3
.
Reaction
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Avogadro: at the same T and P, the ratio of gas volume = the ratio of gas moles
volume of CO₂ = 3/1 x 25 = 75 m³
Which statement best describes one way that plate tectonics causes change
on Earth?
A. Convection currents in the mantle cause seafloor spreading over
time.
B. The movement of plates causes convection currents to form in the
mantle.
C. Seafloor spreading causes large mountain ranges to form on the
continents.
D. The subduction of oceanic crust helps drive convection currents in
the mantle.
Answer:
D
Explanation:
I took the test ^^
Answer: the answer is D. The subduction of oceanic crust helps drive convection currents inthe mantle.
Explanation:
The following acid-base reaction occurs spontaneously in the gas phase: NH₃(g) + HCl(g) ⇌ NH₄Cl(s) During an experiment, 10. 00 g of solid NH₄Cl was added to a 500. 0 mL flask at 25. 0°C. The equilibrium constant for this reaction at this temperature is 8. 9 × 10¹⁵, determine the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium
The partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium is mathematically given as
PH3=1.06*10^{-8}atmPHCl=1.06*10^{-8}atmWhat is the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium?Question Parameter(s):
Generally, the equation for the Chemical Reaction is mathematically given as
HCl(g) ⇌ NH₄Cl(s)
Therefore
[tex]Keq=\frac{1}{PH3*PHC}[/tex]
PH3*PHCl=1.23*10^16
Therefore
P^2=1.23*10^{-16}
P=1.06*10^{-8}
In conclusion,
PH3=1.06*10^{-8}atm
PHCl=1.06*10^{-8}atm
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6. Although Inigo and the masked man are rivals, they actually have a lot
in common.
Give three examples from the swordfighting scene that show their
similarities.
The three (3) examples from the sword fighting scene that showed Inigo and the masked man's similarities are:
They can fight with both hands.They are both professional swordsmen. Inigo and the masked man discussed about their life.Who is Inigo?Inigo Montoya was one of the fictional character in the novel titled "The Princess Bride" and written by William Goldman's in 1973. Inigo hails from the village called Arabella and he was raised by his father Domingo Montoya, who was a master craftsman that makes sword.
In The Princess Bride, Inigo had a swordfight with a man in black (masked man) and they have the following things in common:
They can fight with both hands.They are both professional swordsmen. Inigo and the masked man spoke about their personal life.Read more on Inigo here: https://brainly.com/question/1130107
what is polyatomic?..
Answer:
The term poly implies many, so a polyatomic particle is a particle that contains more than one atom. Hence it is not the same as monatomic particles, which contain just a single iota. Instances of monatomic particles incorporate Na+ and Cl-
Answer:
The ions which contain more than one atoms behaving as a single unit are called polyatomic ions. For example, PO43−,CO32−
Explanation:
The graph shows the average number of striped bass caught near a dam built in 1958. Which statements are supported by this data?
A
The dam is causing the numbers of striped bass to decrease.
B
The greatest number of striped bass were seen in this area in the 1980’s.
C
The number of striped bass at this location has decreased since the data collection began.
D
The greatest decrease in total number of bass in the region occurred between 1988 and 1989.
E
There is a correlation between the number of striped bass and the amount of time the dam has been in operation.
Badrd on the graph provided, it can be concluded that:;
The dam is causing the numbers of striped bass to decrease.How does human activities impact wildlife population?Human activities have on the most part affected wildlife negatively.
Humans activities such as construction of dams across rivers have being demonstrated to negative affect the habitat and hence the population of aquatic organisms in the area.
The data shown on the graph shows a steep decrease in the population of the striped bass after the construction of the dam in 1958.
Therefore, it can be concluded that the population of the striped bass has been on a steady decline since 1958.
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An alkyne with six carbon atoms per
molecule has relative molecular mass
of [C = 12, H = 1]
72,
82
84
86
Explanation:
C6H10
12(6) + 1(10)
= 72 + 10 = 82
The relative molecular mass of the alkyne with 6 carbon atoms is 82 gram/mole.
What is molecular mass?Molecular mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molar mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.Relative molecular masses are also calculated by the same method.
In case of an alkyne with formula C₆H₁₀ relative molecular mass is calculated as, 12×6 +1×10=82 g/mole.
Hence, the relative molecular mass of an alkyne with 6 carbon atoms is 82 g/mole.
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Please help
Science....
Thanks
Answer:
docx it is a science document
What is the chemical formula for ammonia, according to this illustration?.
Answer:
Ammonia is a chemical compound used as a fertilizer because it is rich in nitrogen. Its chemical formula is NH3, which means that it consists of one atom of nitrogen and three atoms of hydrogen per molecule.
A chemical formula is a symbolic representation of a chemical compound. It tells us about the number of atoms present in the compound. The chemical formula of ammonia is NH₃.
What is ammonia?An inorganic compound which is composed of nitrogen and hydrogen with the formula NH₃ is called the ammonia. It is a colourless gas with pungent smell. It is lighter than air and it can be easily liquified due to the strong hydrogen bonding between the molecules.
In ammonia there are 3 bond pairs and one lone pair around the central nitrogen atom. According to VSEPR theory, these tend to stay as far apart as possible to minimize mutual repulsion. Hence they arrange themselves in tetrahedral manner.
However due to the lone pair of electrons, the actual geometry of the molecule is trigonal pyramidal. One of the most important feature of ammonia is that it is a weak base.
Thus the chemical formula of ammonia is NH₃.
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What does the law of reflection state?
A. The angle of incidence is greater than the angle of refraction.
B. The angle of incidence is equal to the angle of reflection.
O C. The angle of incidence is greater than the angle of reflection.
D. The angle of incidence is equal to the angle of refraction.
Answer:
B is the correct answer
Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material?
True
False
Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material. This is a true statement.
Features of natural materialsNatural materials are the physical matters that are made from plants, animals and ground(environment) which has not been subjected to any chemical processes for modification.
But any natural material that has undergone any chemical process which has been designed and manufactured to fulfil a particular purpose is called a synthetic material.
Therefore, any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material.
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Can you post all the answers for "Specific Mass Conversions Quick Check"
1. How does stoichiometry support the law of conservation of mass?(1 point)
2.Nitrogen gas and hydrogen gas react to produce ammonia according to the following equation.
N2 + 3H2 → 2NH3
Which ratio of components is correct?
Answer:
#1: The law of conservation of mass underpins the principles of stoichiometry. Because matter cannot be generated or destroyed, the mass of each element present in a chemical reaction's product(s) must be equal to the mass of each element present in the reactant (s).
#2: 3molH2:2molNH3
Explanation:
Question 1:
Stoichiometry allows us to make predictions about the outcomes of chemical reactions. Making useful predictions is one of the main goals of science, the other being the ability to explain phenomena we observe in the natural world.According to the Law of Conservation of Mass, in "ordinary" chemical reactions, mass is neither created nor destroyedStoichiometry deals with the chemical quantities of a BALANCED chemical equations.The following is an example of an unbalanced equation and we can see why it does NOT follow the law of conservation of mass.H2O (l) ⇒ H2 (g) + O2 (g)From the equation above, it appears that you begin with 2 hydrogen atoms and form 2 hydrogen atoms. That's just fine. BUT, you cannot begin with 1 oxygen atom and end up with 2 oxygen atoms on the product. This is a violation of the Law of Conservation of Mass.Below, you will find the balanced equation for this reaction which DOES follow this law.2 H2O (l) ⇒ 2H2 (g) + O2 (g)In the above example, you begin with 4 hydrogen atoms and produce four hydrogen atoms; you start with 2 oxygen atoms and end with 2 oxygen atoms.The coefficients needed to balance this chemical equation tell you the ratios that the reactants and products exist in; stoichiometry deals with the quantities of balanced equations.---------------------------------------------------------------------------------------------------Question 2:
In order to determine the mole ratio, we need to begin with a balanced chemical equation.For this reaction the balanced chemical equation isN2 + 3H2 ⇒ 2NH3The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.1 moln: 3mol2 : 2molNH3The mole ratios for each substance pair would be1molN2: 3molH21molH2/3molH2 or 3molH2/1molN21molN2:2molNH31molN2/2molNH3 or 2molNH3/1molN23molH2:2molNH33molH2/2molNH3 or 2molNH3/3molH2Which of the following are said to be physical properties of gases?
Select one:
a.
The atoms or molecules of a gas are relatively far apart.
b.
A gas expands to fill the space in a closed container.
c.
A gas is easily compressed.
d.
All of the above.
e.
Answers A and B only.
Answer:
Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.
SO the answer is- D. All of the above
Explanation:
What volume of concentrated 18M solution is required to prepare 550 mL of a 2. 0M solution?
Explanation:
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A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same conditions? [CH4 = 16; H2 = 2]
The time taken for the same volume of methane gas to diffuse is 7.1 s.
Rate of gas diffusionThe rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.
[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }[/tex]
where;
M1 is the molar mass of methane (CH4) = 16 gM2 is the molar mass of hydrogen as = 2t1 is time taken for methane = 20 st2 is the time taken for hydrogen = ?[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s[/tex]
Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.
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The time it takes for hydrogen to diffuse is 7.07 seconds
Graham's law of diffusionTo calculate the time it will take hydrogen gas to diffuse, we use the formula from Graham's law of diffusion.
Formula:
T'/T = √(M'/M)........... Equation 1Where:
T' = Time taken for menthane to diffuseT = Time take for hydrogen to diffuseM' = Relative molecular mass of menthaneM = Relative molecular mass of hydrogen.Make T the subject of the equation
T = T'/[√(M'/M)]................ Equation 2From the question,
Given:
T' = 20 secondsM' = 16M = 2Substitute these values into equation 2
T = 20/[√(16/2)]T = 20/[√(8)]T = 20/(2.828)T = 7.07 secondsHence, The time it takes for hydrogen to diffuse is 7.07 seconds.
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Are the following chemical equations balanced or
Balanced / Onbalanced
.
CH4 + 4Cl2 → CCL + 2HCL
Balanced / Unbalanced
N2 + 3H2
2NH3
Balanced / Unbalanced
C3H2 + 302 + 3CO2 + 4H2O
+
Answer:
the first is unbalanced
because the number of hydrogen are not equal on both sides
the second one is balanced
because the number of nitrogen and hydrogen atoms are equal on both sides
and the third one seems to be incomplete
What is the Mr of a substance where 1 mole has a mass of 11 g?
Answer:
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly
12 grams of carbon-12 (i.e., 6.023 X 1023).
Explanation:
7. What assumption of the kinetic-molecular theory explains why a gas can expand to fill a container?
Answer:
Gas molecules move at random with no attractive forces between them.
Explanation:
Kinetic-molecular theory is based on the following postulates, or assumptions.
Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.
These particles move in a straight line until they collide with another particle or the walls of the container.
These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.
There is no force of attraction between gas particles or between the particles and the walls of the container.
Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
The average kinetic energy of a collection of gas particles depends on the temperature of the gas and nothing else.
_______________ current runs parallel to the beach and brings the waves in at an angle carrying rock materials from the place of erosion to the place of deposition.
Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.
What is Wave Current?Wave current is the movement of large water particles in all directions which is created by strong wind . Currents can be temporary or long-lasting. It can occur near the surface or in the deep ocean. It carries particles from one place and deposit it to another place.
Therefore, Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.
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HCl + CaCO3 → CaCl2 + H2O + CO2 balanced equation
Pls Help i will give 100 Points!!!
[tex]\\ \rm\rightarrowtail 2HCl+CaCO_3\longrightarrow CaCl_2+H_2O+CO_2[/tex]
On both sides
H=2O=3Ca=1C=1Hence balanced
what are of study in chemistry is concerned with the heat changes that occur during chemical reactions?
Answer:
Thermochemistry
Explanation:
Thermochemistry is the area of study in chemistry that is concerned with the heat transfers that occur during chemical reactions.
Hope this helps.
When common salt sodium chloride is dissolved in water sodium and chloride – not formed
Answer:
they do not separate to form lumps of sodium metal or to form chlorine gas.
Explanation:
While it's true that when a crystal of the ionic substance sodium chloride is dissolved in water the sodium and chloride ions separate from one another, they do not separate to form lumps of sodium metal or to form chlorine gas. Rather, they remain as single Na+ and Cl− ions, surrounded by water molecules
which of these is not a function of the digestive system
A) break down food
B) absorb nutrients
C)synthesis of insulin
D)synthesis of vitamin K
Answer:
C
Explanation:
I believe it is C but don't take my advice 100%.