Answer:
Prokaryotic / Eukaryotic
What volume of hydrogen gas forms if 10.0 g of Zn reacts at STP?
Answer:
0.690 liters is the volume of hydrogen gas produced if 2.00 grams of zinc is used with an excess of hydrochloric acid.
Explanation:
Zn(s)+2HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)
Mole so zinc = \frac{2.00}{65 g/mol}=0.03077 mol65g/mol2.00=0.03077mol
According to reaction, 1 mole of zinc gives 1 mole of hydrogen gas.
Then 0.03077 mole of zinc will give :
\frac{1}{1}\times 0.03077 mol=0.03077 mol11×0.03077mol=0.03077mol of hydrogen gas
Pressure of hydrogen gas ,P= 1 atm
Temperature of of hydrogen gas ,T= 273.15 K
Volume of hydrogen gas = V = ?
Moles of hydrogen gas = 0.03077 mol
PV = nRT (Ideal gas equation )
V=\frac{nRT}{P}=\frac{0.03077 mol\times 0.0821 atm L/mol K\times 273.15 K}{1 atm}V=PnRT=1atm0.03077mol×0.0821atmL/molK×273.15K
V = 0.690 L
Why is carbon an element and not a compound?
A. Carbon bonds easily with oxygen, but not helium.
B. All carbon atoms have the same number of protons.
o C. All carbon atoms have the same number of neutrons.
.
D. Carbon is found in all living organisms.
Answer:
Carbon is found in all living organisms.
Answer: d
Explanation: i promise I've took the k-12 test
Bromine is an element that often gains an electron to become a negatively charged ion. Potassium is an element that often loses an electron to become a positively charged ion.
Why are bromine and potassium likely to react with one another?
Bromine needs to gain one more electron to have a noble gas configuration or 8 valence electrons, & potassium needs to lose one so they make a transference of electrons in an ionic bond.
What are the functions of ionic bonding?Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.
Ionic bonding results in compounds known as ionic, or electrovalent, compounds, which are best exemplified by the compounds formed between nonmetals and the alkali and alkaline-earth metals.
The charge of a cation or anion is denoted as a superscript after the formula of the ion. A + sign denotes a positive charge resulting from loss of electrons. A - sign denotes a negative charge resulting from gain of electrons.
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why is it that lipids, such as oil, do not readily mix with water?
Answer:
Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.
Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it is made up of non-polar molecules while water molecules are polar.
what are the composition of lipid ?Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.
A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.
Glycerol is another component which is a thick sweetish liquid, soluble in water and can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.
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Que relación tiene el metabolismo celular con el mantenimiento de los seres vivos
Help meeeeeeeeeeeeeee
Answer:
4) 2Na + Cl2 → 2NaCl
5) 2Mg + O2 → MgO
6) 2H2 + 2O2 → 2H2O
Explanation:
4) In order for it to be well balanced, yeah you've got to add 2 in front of Na before the reaction and after the reaction.
5) Add 2 in front of Mg bcuz of the same reason in number 4 but you don't have to add 2 in front of the others bcuz it's alrd well balanced.
6) Tbh for this one, it got me staring at my cat until he freaks out but like yeahh, I tried :')
Do you think the Clean Air Act was a good solution to the changing environment in England? Explain.
Americans breathe less pollution and face lower risks of premature death and other serious health effects. Environmental damage from air pollution is reduced. The value of Clean Air Act health benefits far exceeds the costs of reducing pollution. ... New plants and factories install modern pollution control technology.
This photo shows two objects: the lead in a pencil and a mineral sample.
Both are made of the element carbon. Which statement about these objects
must be true?
A. They contain the same number of atoms
B. They have the same mass
C. They consist of a single type of atom
D. They take up the same amount of space
PLS hurry I’ll give brainlist!! :>
NO2 is a reddish brown color while N2O4 is colorless. Based on this information only, which type of spectroscopy would be a good choice to determine the identity of an unknown sample that contains either
NO2 or N2O4?
Spectroscopy is is an area of science that deals with interaction of matter and the electromagnetic spectrum. Colorimetry can distinguish between a colorless and a colored substance.
The type of spectroscopy that would be a good choice to determine the identity of an unknown sample is a type of spectroscopy that deal with the interaction of visible light with matter.
A type of spectroscopy that deals with interaction of visible light with matter is colorimetry. Colorimetry can measure the concentration of a substance as a function of the amount of light that is absorbed by the substance.
Since NO2 has a reddish brown color, its concentration can be measured using colorimetry. The concentration of N2O4 can not be measured using colorimetry because it is colorless.
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14. An atom has 10 protons, 8 electrons, and 7 neutrons. What is the charge of the
atom and what type of ion is it?
The charge on an atom = # of protons - # of electrons
= 10 - 8
= +2
∴ the atom is a CATION (ion) of +2 charge.
pleasssse help!
According to the ideal gas law, which will occupy a larger volume - 100 g of helium or 100 g of oxygen, if both are at the same temperature and pressure.
Answer:
Helium
Explanation:
The pressure of He gas would be greater than that of O2 gas
Calculate the percent composition by mass of each element in NaClO2.
Answer: Divide the mass of the first dissolved component by the solution mass, and then multiply the result by 100 to calculate the mass percentage. In our example, the first dissolved compound is NaCl; the mass percent is (10 g / 136 g) x 100 percent = 7.35 percent.
Explanation: its up, look
5. A football field is about 100 meters long. If it takes a person 20 seconds to run its length, how fast (what speed) were they running?
Answer:
Speed, v = 5 m/s
Explanation:
The length of the football field, l = 100 m
the person takes 20 seconds to run its length
v=
t
d
v=
20 s
100 m
v=5 m/s
determine the velocity of a 55-kg skier whose kinetic energy is 8900 J
Answer:
Kinetic energy = 1/2mv^2
8900 j =1/2*55*v^2
v^2=8900*2/55
v^2=323.6
v=17.98
Explanation:
When does an electrically charged object attract another object?
A. When one object is far away from the other
B. When each object is negatively charged
C. When the objects are oppositely charged
D. When each object is positively charged
Answer:
C. When the objects are oppositely charged
Explanation:
Electrostatic interactions are commonly observed whenever one or more objects are electrically charged. Two oppositely-charged objects will attract each other. A charged and a neutral object will also attract each other. And two like-charged objects will repel one another.
From Bing, this is not my work
Answer:C
Explanation:
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC! lol i think its c
The formula of alkanes contain 3 5 7 and 9 carbon atoms
Explanation:
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single.
14-Los
ojos
brillantes
Platero copian todo el
Y vivos de
paisaje de
Sol y de lluvia es simil o personificación o metáfora o gustativa
El fragmento es un ejemplo de metáfora porque presenta la relación entre la idea de los ojos de Platero con el clima soleado y lluvioso.
Metáfora es un término de origen griego que se refiere a la acción de traslación. En el lenguaje, una metáfora es una figura retórica que consiste en la asignación de un concepto o expresión a una idea sin que esta se relaciones directamente con esta definición.
De acuerdo a lo anterior, en el fragmento se presenta una metáfora en la que se relacionan los ojos de Platero con las horas de sol y lluvia.
Nota: Esta pregunta está incompleta porque el fragmento está incompleta. Aquí está el fragmento completo.
Los ojos brillantes y vivos de Platero copian toda la hora de sol y lluvia en cuyo ocaso, sobre el campo de San Juan, se ve llover, deshilachada, otra nube rosa.Aprenda más en: https://brainly.com/question/22976823
which of the following is a pure substance
1 heterogenous mixture
2 homogenous mixture
3 solution
4 element
Answer:
2 homogenous mixture
Explanation:
Hydrogen sulfide gas is combusted with oxygen gas to produce sulfur dioxide gas and water vapour. If there is 48.4 L of oxygen available. What volume of hydrogen sulfide gas may be combusted if the pressure and temperature are held constant?
Answer:
2H2S + 3O2 → 2SO2 + 2H2O
V(O2) = 48.4 L
p = 105 kPa = 1.036 atm
T = 190 + 273 = 463 K
Ideal gas law:
pV = nRT
n = \frac{pV}{RT}n=
RT
pV
R = 0.08206 L×atm/mol×K
n(O2) = \frac{1.036 \times 48.4}{0.08206 \times 463}=1.319 \; mol=
0.08206×463
1.036×48.4
=1.319mol
According to the reaction:
n(H2S) = \frac{2}{3}
3
2
n(O2) = \frac{2}{3} \times 1.319 = 0.8798 \;mol
3
2
×1.319=0.8798mol
V = \frac{nRT}{p} \\ V(H_2S) = \frac{0.8798 \times 0.08206 \times 463}{1.036}=32.26 \;LV=
p
nRT
V(H
2
S)=
1.036
0.8798×0.08206×463
=32.26L
Answer: 32.26 L
Explanation:
Someone pls help me I will make you brain
Answer:
i cant read it but its c and a
Explanation:
my thinking faces
Why is it important for scientists to use the scientific method?
A. Scientists would not ask questions if the scientific method were
not used.
B. Experiments would not produce any data without the scientific
method.
C. The scientific method helps scientists get accurate, repeatable
results,
D. Using the scientific method means that the results will support the
hypothesis
Explanation:
It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results. By using a standardized approach in their investigations, scientists can feel confident that they will stick to the facts and limit the influence of personal, preconceived notions.
I hope this helps you out!
Someone pls help me I will make you brain
Answer: B
Explanation:
Physics have been taking the Hippocratic Oath for more than 2,000 years. Among other things, to Serie doctors who take the oath promise to uphold doctor-patient confidentiality. Why do you think this is an ethical issue?
Answer:
Physicians and it is ethical because they promise to help
Explanation:
Which sequence is used to separate a soluble salt from a mixture of a soluble and an insoluble
salt?
A
add solvent, heat the mixture, crystallise the mixture
add solvent, heat the mixture, filter, crystallise the filtrate
B
C
heat the mixture, filter, crystallise the filtrate
heat the mixture, filter, add solvent, crystallise the filtrate
D
Is it possible to have an electromagnetic wave with a wavelength (a) of 104.68 m and an energy of 3.25 x 10-27 J? Show your work.
2. You work for an environmental company as an environmental toxicologist and have been hired to determine the contaminant present in a local resident’s pool. Create a flow chart outlining how you would detect the possible presence of Fe2+ and/or Sr2+
A student makes two mixtures, both made of the same substances. What must be true of the two mixtures? A Both mixtures have the same density. B Both mixtures have the same temperature. C Both mixtures can be physically separated into its components. D Both mixtures are physically combined in the same proportions.
A student makes two mixtures, both made of the same substances. Both mixtures can be physically separated into its components. Therefore, option C is correct.
What is mixture ?A substance made up of two or more separate chemical compounds that are not chemically linked is referred to as a mixture. A mixture is the physical blending of two or more substances while maintaining their distinct identities. It can take the form of solutions or suspensions.
A pure substance is a single sort of matter that cannot be divided into other kinds of matter by any physical methods. A pure substance has a known and consistent composition at all times.
When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. When two or more compounds combine to create a new substance that cannot be broken down into its constituent parts, a chemical reaction takes place.
Thus, option C is correct.
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2. Differentiate the types of tectonic plates.
There are three main types of plate boundaries:
Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. ...
Divergent boundaries – where two plates are moving apart. ...
Transform boundaries – where plates slide each other.
sorry pag mali ...Answer:
Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. ...
Divergent boundaries – where two plates are moving apart. ...
Transform boundaries – where plates slide passed each other.
Explanation:
Which of the responses contains all the true
statements and no others regarding
electromagnetic radiation (light)?
what is the condensed electron configuration for nitrogen
Answer:
In writing the electron configuration for nitrogen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for N goes in the 2s orbital. The remaining three electrons will go in the 2p orbital. Therefore the N electron configuration will be 1s22s22p3.
Explanation:
hope you get it right:)
Answer:
the electron configuration for N will be 1s^2 2s^2 2p^3
A car moves with a velocity of 15 m/s west for 3 seconds. Then, the
car moves with a velocity of 15 m/s east for 1 second. What is the
total displacement of the car?
Answer:
450 metre
Explanation:
VELOCITY = DISPLACEMENT /TIME TAKEN. THEREFORE THE DISPLACEMENT = 450 M.
Explanation:
