Answer:
mostly water
Explanation:
just did he test on edg
Classify the following as a chemical or physical property: Iron melts at 1535 degrees C. chemical or psychical?
Answer:
Physical property
Explanation:
Change in state is a physical property of matter.
1 and 2 answer choice help please?
Answer:
I think its b be ause it looks like a better answer and it has some detail to it
Help please because why not
High exposure to mercury is indicated by a blood level above 10 mg/L. How many mercury atoms are in a liter of blood that contains 10 mg mercury?
Answer:
3.0x10¹⁹ atoms
Explanation:
First we convert 10 mg of mercury into grams:
10 mg / 1000 = 0.01 gThen we convert 0.01 g of mercury into moles, using its molar mass:
0.01 g ÷ 200.59 g/mol = 4.99x10⁻⁵ molThen we convert moles into number of atoms, using Avogadro's number:
4.99x10⁻⁵ mol * 6.023x10²³ atoms/mol = 3.0x10¹⁹ atomswhich part of a food chain absorbs the Sun's light and heat
The plants are the part that absorb the Sun's light and heat.
The part of a food chain that absorbs the sun's light and heat is producers that are plants.
What is a food chain?A food chain is the chain that shows the transfer of energy from one part to another.
The bottom of the food chain is the producers that make their own food, then the consumers and the decomposers.
Thus, the part of a food chain that absorbs the sun's light and heat is producers that are plants.
Learn more about food chain
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HELP me please................
Answer: I’m pretty sure your answer is B
Explanation:
Answer:
The answers is B
Explanation:
I did that question before !!
Which is the correct number of moles of nitrogen monoxide that is produced from 13.2 moles of oxygen gas in the presence of excess ammonia (NH3)?
Answer:
10.56 moles of NO will be produced
Explanation:
The balanced reaction of ammonia, NH₃ with oxygen, O₂ is:
4NH₃ + 5O₂ → 4NO + 6H₂O
Where 5 moles of oxygen react with an excess of ammonia to produce 4 moles of nitrogen monoxude.
If 13.2 moles of O₂ react:
13.2 mol O₂ * (4 mol NO / 5 mol O₂) =
10.56 moles of NO will be producedhow many molecules are in 45.0 g of water
Which statement below accurately describes the atoms of a specific element?An antimony, Sb, atom contains 122 protons inside the nucleus and 51 neutrons outside the nucleus.A manganese, Mn, atom contains 55 electrons outside the nucleus and 25 neutrons inside the nucleus.A chlorine, Cl, atom contains 35 electrons and 27 protons inside the nucleus.An arsenic, As, atom contains 33 protons inside the nucleus and 33 electrons outside the nucleus.
Answer: An arsenic, As, atom contains 33 protons inside the nucleus and 33 electrons outside the nucleus.
Explanation:
The protons are positively charged, electrons are negatively charged and neutrons has no charge (neutral). The protons and neutrons are present inside the nucleus and the electrons are located outside the nucleus.
Antimony (Sb) has an atomic number of 51 and thus contains 51 electrons and 51 protons. It has a mass number of 121 and thus conatins 70 neutrons.
Manganese (Mn) has an atomic number of 25 and thus contains 25 electrons and 25 protons.
Chlorine (Cl) has an atomic number of 17 and thus contains 17 electrons and 17 protons.
Arsenic (As) has an atomic number of 33 and thus contains 33 electrons and 33 protons.
Work out the empirical formula of a compound that contains 35% of nitrogen , 5% of hydrogen and 60% of oxygen.
Answer:
[tex]H_5N_5O_6[/tex]
Explanation:
Hello there!
In this case, for the determination of empirical formulas, it is firstly necessary to assume the given percentages of the constituent atoms as the masses so we can compute their moles in the formula:
[tex]n_N=\frac{35gN}{14.01g/mol} =2.5molN\\\\n_H=\frac{5g}{1.01 g/mol}=5molH\\\\n_O=\frac{60g}{16 g/mol} =3molO[/tex]
Thus, we need to divide the resulting moles, by the fewest ones (those of nitrogen) in order to determine the coefficients in the formula:
[tex]N:\frac{2.5}{2.5}=1\\\\H:\frac{5}{2.5}=2\\\\O:\frac{3}{2.5} =1.2[/tex]
However, we need to turn all these numbers, whole numbers, so we multiply by 5 to get:
[tex]H_5N_5O_6[/tex]
Best regards!
22) An embryo implants and begins to develop within which structure? *
4 points
Ovary
Oviduct
Cervix
Uterus
Answer:
Subscribe to
Game Antics
If an electron has an acceleration of 2.33 × 102 m/sec2, what is this value in units of m/min2?
Answer:
The electron has an acceleration of 838800 [tex]\frac{m}{min^{2} }[/tex]
Explanation:
An electron has an acceleration of 2.33*10² [tex]\frac{m}{sec^{2} }[/tex]
To be able to express in units [tex]\frac{m}{min^{2} }[/tex], you must carry out the conversion taking into account that 1 [tex]\frac{m}{sec^{2} }[/tex]= 3600 [tex]\frac{m}{min^{2} }[/tex]. Then you can apply the following rule of three: if 1 [tex]\frac{m}{sec^{2} }[/tex] equals 3600 [tex]\frac{m}{min^{2} }[/tex], 2.33 * 10² [tex]\frac{m}{sec^{2} }[/tex] equals how much [tex]\frac{m}{min^{2} }[/tex]?
[tex]\frac{m}{min^{2} }=\frac{2.33*10^{2} \frac{m}{sec^{2} }*3600\frac{m}{min^{2} }}{1\frac{m}{sec^{2} }}[/tex]
[tex]\frac{m}{min^{2} }=838800[/tex]
The electron has an acceleration of 838800 [tex]\frac{m}{min^{2} }[/tex]
What are the three major categories used to classify elements?
a Solids, liquids, gases
b Protons, neutrons, electrons
c Groups, periods, states
d Metals. non-metals, metalloids
Answer:
i think option no. " D " = " metals, non-metals, metalloids " is the correct answer.
hope this answer will help u.
have a great time
18.
react to cause chemical reactions
Protons
Neutrons
Electrons
the tiny particle of an atom moves around the nucleus is the
A. plasma
B. proton
C. neutron
D. electron
Answer:
D
Explanation:
1.) Plasma is not found in electrons
2.) Protons are found in the nucleus
3.) Neutrons are found in the Nucleus
4.) Electrons orbit the nucleus in the electron cloud
This unit discusses in detail the role of catalysts to lower the activation energy of reactions. The term catalyst appears in nonscientific discussions to refer to something that provokes or speeds significant change or action. Consider this example from the 2006 Associated Press article "Chernobyl cover-up a catalyst for glasnost":
"For the Soviet Union, Chernobyl was a catalyst that forced the government into an unprecedented show of openness that paved the way for reforms leading to the Soviet collapse"
Discuss how this scientific term has made its way into common usage. Does the term catalyst carry the same meaning in regular usage? How is it used differently in a scientific context compared to a nonscientific contexte
Answer:
It can be brought into regular conversation easily I feel it means to "provoke" or "speeds significant change or action" I can see someone saying that in a conversation, "chlorine acts as a catalyst promoting the breakdown of ozone".
I would say it would take the same meaning depending on how you say it and when and what the context of what you're saying it in.
For scientists, it means to change quickly. For someone who says it in a conversation may be saying to stop provoking someone.
Explanation:
Pleseee help me pretty please ✨
Answer:
6 N.
Every thing has equal and opposite reaction.
Answer:
The answer is C I believe, I do not know for sure but I think that is the answer..
I'm sorry if I'm wrong.
Explanation:
Can you please help me it’s not a hard question
5. Para la siguiente reacción: KClO3 (s) KCl(s) + O2
Si se descomponen 500 gramos de una muestra impura de clorato de potasio y se recogen 100 litros de O2 medidos bajo condiciones normales de presión y temperatura. Determine la pureza de la muestra.
Answer:
72.95%
Explanation:
Para resolver esta pregunta, debemos hallar las moles tóricas que se producirían en la reacción asumiendo que los 500g son únicamente de clorato de potasio haciendo uso de la reacción balanceada:
2KClO₃(s) → 2KCl(s) + 3O₂(g)
Donde dos moles de clorato de potasio producen tres moles de oxígeno.
Después de hallar las moles teóricas de oxígeno debemos hallar las moles producidas usando PV = nRT. La pureza SERÁ:
Moles producidas / moles Teóricas * 100
Moles clorato -Masa molar: 122.55g/mol-:
500g KClO₃ * (1mol / 122.55g) = 4.08 moles KClO₃
Moles O₂ teóricas:
4.08 moles KClO₃ * (3 moles O₂ / 2 moles KClO₃) = 6.12 moles
Moles producidas:
PV / RT = n
Donde P = 1atm a STP
V es volumen = 100L
R es constante de los gases = 0.082atmL/molK
T =273.15K a STP
Reemplazando:
1atm*100L / 0.082atmL/molK*273.15K = 4.46 moles
La pureza de la muestra es:
4.46 moles / 6.12 moles * 100 = 72.95%
Identifying Cell Structures
Which structures are found in plant colls, but not in animal cells? Check all that apply
)
coll wall
coll membrane
chloroplasts
O lysosomes
ribosomes
vacuoles
Answer:
cell wall and chloroplasts
Explanation:
Yoyoyoyoyoyoyo
Yoyoyoyoyoyoyoyo
sorry but you are ;silly. adjective. showing that you are not intelligent, not serious, not thinking carefully etc.
idiotic. adjective.
unintelligent. adjective. not intelligent.
simple-minded. adjective. ...
slow-witted. adjective. ...
slow. adjective. ...
brainless. adjective. ...
thick. adjective.
And you can learn a lot more! Upload another question and feel free to not be so, ummaculate
Which of these statements describes a physical property of hydrogen? Group of answer choices it is found in acids. it is less dense than oxygen gas. it reacts with oxygen to form water. it is highly flammable.
Answer:
it is less dense than oxygen gas.
Explanation:
Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.
Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.
In Chemistry, the properties of a chemical element that can be observed and measured without changing its chemical nature is known as a physical property. It includes density, color, freezing point, opacity, smell, melting point, viscosity, etc.
Hence, the statement which describes a physical property of hydrogen is that it is less dense (density) than oxygen gas.
During photosynthesis, plants change light energy into:
chemical energy
solar energy
mechanical energy
electrical energy
i will mark brainlest
Answer:
chemical energy
Explanation:
just put that
Answer:
chemical energy
Explanation:
it is the light dependent reaction
Convert 75k to oC
(I’ll mark you as brainlister)
Answer:
-198.15
Explanation:
sorry if wrong form
What pressure would be required to take 100.0 ml of a gas at 103.0 kPa and squish it down to 2.00 ml
Answer:
5150 kPa
Explanation:
Given that,
Initial volume, V₁ = 100 mL
Initial pressure, P₁ = 103 kPa
Final volume, V₂ = 2 mL
We need to find the new pressure of the gas. The relation between the pressure and the volume of gas is given by :
[tex]P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{103\times 100}{2}\\\\P_2=5150\ kPa[/tex]
So, the new pressure is 5150 kPa.
Find the net force on a rope which is being pulled by 2 groups of
students. The blue team is pulling with a force of 1500 N to the west and
the orange team is pulling with a force of 1300 N to the east.
Answer:
200 N to the west b/c we have 1500 to west and
1300 N to east . the forces have a opposite direction.
thus we add the force. and we gain 200N force.
Help ASAP If you know what to do comment if u don’t I’ll report you ! Points added
Proton:
Positive
Found in Nucleus
Mass of 1 AMU
Neutron:
Neutral
Found in Nucleus
Mass of 1 AMU
Electron:
Negative
Found in orbitals
Mass of 0 AMU
How many liters are in 72.1 g HBr?
Answer:
0.0721
Explanation:
most of the earth's landmasses is covered by a mixture of bits of rock and bit of once~living part of plants or animal. this material is called
and its not fossil
A trait in which one allele for a gene contributes and the phenotype is an intermediate between the dominante
and recessive is what type of trait?