Answer:
0.0063mol
Explanation:
Number of moles (n) in a substance can be calculated by dividing the number of atoms (nA) of that substance by Avagadro's number i.e. 6.02 × 10^23. That is; n = nA ÷ 6.02 × 10^23
1 mol of Gold = 6.02 × 10^23 atoms
Therefore, 3.8 x 10^21 atoms of Gold will be;
3.8 x 10^21 ÷ 6.02 × 10^23
= 3.8 ÷ 6.02 × 10^ (21 - 23)
= 0.6312 × 10^-2
= 0.0063mol of Gold
Important question, please answer(worth 64 points.)
Balance this equation
___C8H18 + ____O2 ⇒ ___CO2 + ___H2O
Answer:
Is is talking about h20 water?
Explanation:
Answer:
2C8H18 + 25O2 ----> 16CO2 + 18H2O
Explanation:
Basically you can first list all your elements from your products and reactants:
C 8 x 2 C 1 x 16
H 18 x 2 H 2 x 18
O 2 x 25 O (2 x 18) + (2 x 16)
Organisms that depend on other organisms for food are consumers. Which consumer think is a herbivore (eats plants only)
Examples of herbivores are buffalo, elk, some bird species, mice, squirrels, rabbits, and many more.
To solve this, we must know each and every concept behind herbivores and carnivores. Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.
What is herbivores?Herbivores, often known as herbivorous animals, are creatures that eat plants, leaves, fruits, and other plant-based foods for nourishment. They are classified as primary eaters and are found at levels 2 or above in the food supply chain.
Herbivores include cows, goats, giraffes, sheep, and zebras. Interestingly, there really are herbivores who specialize in eating on specific parts of the plant; for example, frugivores are herbivores that graze on fruits, whereas folivores are herbivore that eat on leaves.
Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.
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Describe the radial velocity curve. What is its shape? What is its amplitude? What is the orbital period?
Answer:
The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m )
Curve amplitude : This is the maximum value of the radial velocity curve
Radial velocity shape ; The shape of Radial velocity curve is parabolic in nature
Orbital period : Orbital period is the time taken by the star to make one complete rotation in its orbit
Explanation:
The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m ) while Curve amplitude is the maximum value of the radial velocity curve also The shape of Radial velocity curve is parabolic in nature. and Orbital period is the time taken by the star to make one complete rotation in its orbit
Name the type of equation then balance. Sn,(PO2)2 + Fe(CIO): - Sn(CIO3)2 + FePO,
Answer:
ionic compond
Explanation:
Sn(ClO3)4
What is ∆G system for the system that is described by the following data?
∆H system= -232 kJ, T= 293 K, ∆S system= 195 J/K
∆G system= ∆H system - T∆S system
a. -289 kJ
b. -175 kJ
c. 256 kJ
d. 56,903 kJ
Answer:
it is a
watch for kJ vs J as the enthalpy is in kJ and entropy is in J
Explanation:
Which of the following describes fertilization?
Answer: Fertilization defintion
Explanation:
the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.
Or giving rise to new indivisual organisms or offspring and initiating development
Fluorine is a reactive nonmetal in the Halogen group. What other elements below are also likely to be reactive like fluorine?
a Chlorine and Neon
b Bromine and Xenon
c Lithium and Argon
d Chlorine and Bromine
Answer:okay
Explanation:
what kind of chemical reaction is this
Li + H2O = LiOH + H2
synthesis,combustion,decompostion, or replacement reaction?
Answer: from the lies this is synthesis reaction
Explanation:
It's also oxidation-reduction reaction. Li is oxidised and
H is reduced
The given reaction of lithium metal with water is an example of replacement reaction where, the OH group from water is replaced into LiOH.
What is replacement reaction?A replacement reaction is a type of reaction in which the an atom or group of one reactant is replaced into other reactant. Other type of reactions are combination reaction, decomposition etc.
In a combination reaction, two reactants combine together to form a product without any regrouping. In decomposition reaction a reactant is decomposing to form two or more constituent groups or molecules.
Combustion is the reaction of compound with oxygen to form water and carbon dioxide and synthesis is the making of new product using some reagents going through certain stages.
Hence, the reaction of lithium with water forming lithium hydroxide is a replacement reaction.
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What is the chemical formula for dintrogen monosulfide?
Answer:
sulphur mozron tried is an ignore a compound with the formula SN it is the Sulphur and a log of the traditional nitric oxide no sulphur monitor ID names smiles and plus s - properties chemical formula and as molar mass 46.07 gmo l - 1
Will the following reaction occur?
Mg + HCI →
o Yes, magnesium will replace hydrogen because a bond between H-Cl is unstable.
Yes, magnesium will replace hydrogen because hydrogen is higher on the activity series
list.
o
o this reaction will not occur
Yes, magnesium will replace hydrogen because magnesium is higher on the activity
series list.
2 3 4 5 6
7
8
9 10 11
Answer: Yes, magnesium will replace hydrogen because magnesium is higher on the activity series list.
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.
A general single displacement reaction can be represented as :
[tex]X+YZ\rightarrow XZ+Y[/tex]
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
When magnesium is added to hydrochloric acid, magnesium being more reactive than hydrogen displaces hydrogen atom its salt solution and lead to formation of magnesium chloride and hydrogen gas.
what is the distance from earth to Neptune in standard notation and scientific notation.
Answer:
Scientific Notation: 4.45963 x 109 km (29.811 A.U.) Scientific Notation: 4.53687 x 109 km (30.327 A.U.) By Comparison: If you weigh 100 pounds on Earth, you would weigh 110 pounds on Neptune.
What are non examples of tissue? Help please
Epithelial
I know just one
Hey bedoorrr
Cheetosss
Answer:
this is really insightful, thank you
Explanation:
25 points each, brainlets for best anser, SOoooo please help me -n-
Answer:
Wowowoowoww
St0p tHe sPamM MaAn
Okay little brain
What type of ion is responsible for activating the vesicles in the axon terminal
а
ОО
Magnesium
Rubidium
b
С
Calcium
d
8
Phosphorus
Fluorine
е
Answer:
Calcium ions
Explanation:
Calcium ions entering the cell initiate a signaling cascade that causes small membrane-bound vesicles, called synaptic vesicles, containing neurotransmitter molecules to fuse with the presynaptic membrane.
How many molecules are in 3.5g of NaOH
Answer:
12.o44
Explanation:
Molar mass of naoh is 40g/mol
Number of moles=given mass/molar mass
=80/40=2mol
Again no of atoms 2x6.022x10"23=12.044
According to the concept of Avogadro's number, there are 0.527×10²³molecules in 3.5 g of NaOH.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.Number of molecules= 3.5/40×6.023×10²³=0.527×10²³molecules .
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The development of a nuclear power plant at an ocean site is expected to produce an enormous amount of electric power for a large population. Ocean water will be used to cool the plant and then returned to the ocean. What unintended consequences should be analyzed before starting construction?
Explanation: The awnser would be The effects of warmed water on aquatic life
How many moles of silver nitrate are there in 80.00 grams of silver nitrate?
Answer:
0.47094837228 moles
Explanation:
silver nitrate=169.87g per mol
80/169.87 = 0.47094837228
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of substance =given mass of substance ÷ molar mass of substance
Molar mass of 1 mole of silver nitrate=169.87g/mol
mass of silver nitrate= 80g
Substituting all the given values in the above equation, we get
number of moles of silver nitrate=80 ÷169.87
=0.47moles
Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.
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Number 1 plsssssssssssssssssssssssss
help ........,,,,.........
◆ Atomic mass of carbon (C) = 12g
◆ Atomic mass of oxygen (O) = 16g
No of moles of carbon (C) = 42.8/12= 3.57
No of moles of oxygen (O) = 57.1/16= 3.57
Simplest ratio :-
= 3.57 : 3.57
= 1 : 1
Empirical Formula = CO
Sadiq repeated the experiment by adding sulphuric acid to magnesium carbonate. Write the word equation for this reaction below:
Answer:
Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water
Explanation:
Sulphuric acid + Magnesium Carbonate
The products are;
Magnesium sulphate, carbon dioxide and water
MgCO3 (s) + H2SO4 (aq) → MgSO4 (aq) + CO2 (g) + H2O (l)
Word Equation;
Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water
A student wanted to investigate the effect of light on the growth of
cress seedlings. The student had three pots of seedlings grown in
different conditions. Pot 1 was placed with light from above. Pot 2 was
placed in a cupboard with no light. Pot 3 was placed in a window with
light from one direction only.
The image shows the seedlings at the end of the investigation.
Pot 1
Pot 2 Pot 3
Source Night Cattlin Science Photo Library)
What is the response shown by the cress seedlings in Pot 3? (7.13A)
A.photosynthesis
B.condensation
C.Hrespiration
D.phototropism
Answer:
D.phototropism
Explanation:
Phototropism is a type of tropism in which a plant or plant part responds to light. According to this question, a student wanted to investigate the effect of light on the growth of cress seedlings. The student used three different pots for the experiment.
Pot 1 was placed with light from above. Pot 2 was placed in a cupboard with no light. Pot 3 was placed in a window with light from one direction only. However, the image attached to this question shows that the plants in the different pots face different directions in response to light, which depicts phototropism
How many moles are there in 3.01x10^24 atoms of argon?
Answer:
[tex]\boxed {\boxed {\sf 5.00 \ mol \ Ar }}[/tex]
Explanation:
To convert from mole to atoms, we must use Avogadro's Number: 6.022*10²³. This number tells us the particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of argon.
Let's create a ratio.
[tex]\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}[/tex]
Multiply by the given number of atoms.
[tex]3.01*10^{24} \ atoms \ Ar *\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}[/tex]
Flip the fraction so the atoms of argon will cancel.
[tex]3.01*10^{24} \ atoms \ Ar *\frac {1 \ mol \ Ar}{6.022*10^{23} \ atoms \ Ar}[/tex]
[tex]3.01*10^{24} *\frac {1 \ mol \ Ar}{6.022*10^{23}}[/tex]
[tex]\frac {3.01*10^{24} \ mol \ Ar}{6.022*10^{23}}[/tex]
[tex]4.998339422 \ mol \ Ar[/tex]
The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 8 in the thousandth place tells us to round the 9 to a 0, which also rounds the 9 in the tenths place to a 0, then the 4 to a 5.
[tex]5.00 \ mol \ Ar[/tex]
There are 5.00 moles of argon.
Electric field lines /Conductor/ Electroscope/ Insulator Elementary charge/ Electric field/ Charging by conduction/ Charging by induction/ Potential difference
1. Separation of charges in an object without touching it is____________.
2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric _________.
3. An electric __________ is a material through which charges move about easily. ___________ is giving a neutral object a charge by touching it with a charged object.
4. A material through which electrical charges does not move easily is an electrical _____.
5. The lines providing a picture of the size and strength of the field around a charged object are called the ________.
6. The property of the space around a charged object that exerts a force on other charged objects is the ______.
7. A device that helps determine charge using pieces of metal foil is a(n) _______.
8. The magnitude of the charge of an electron is the ________.
Answer: See explanation
Explanation:
1. Separation of charges in an object without touching it is (charging by induction).
2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric (potential difference).
3. An electric (conductor) is a material through which charges move about easily. (Charging by conduction) is giving a neutral object a charge by touching it with a charged object.
4. A material through which electrical charges does not move easily is an electrical (insulator).
5. The lines providing a picture of the size and strength of the field around a charged object are called the (electric field lines).
6. The property of the space around a charged object that exerts a force on other charged objects is the (electric field).
7. A device that helps determine charge using pieces of metal foil is an (electroscope).
8. The magnitude of the charge of an electron is the (elementary charge)
(HELP ASAP) what is the reaction for Si + S₈ --> Si₂S₄
Synthesis reaction~~
Explanation:
Explain why an organism dies if the respiratory and circulatory system 'paused' for a while.
Answer:
Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body
Explanation:
why does sugar dissolve faster than salt
☁️ Answer ☁️
Option 1: When dissolved, sugar molecules have more opportunities to bond with positive-negative water molecules. Therefore, sugar dissolves faster than salt, because its component molecules are more soluble in water.
❤️
Option 2: Sugar can dissolve easier than salt because when you add 8 spoons of salt into water the salt already starts to stay in the bottom of the cup. And, when you add 30 spoons into water the sugar just starts to stay in the bottom of the cup. It’s almost the same.
Hope it helps.
Have a nice day!~ ￣▽￣❤️
A food web is an overlapping network of food chains.
True or fasle
True I hope this helps!!!!!!!!
Explanation:
Complete the following table based on known properties of ionic and covalent compounds.
Answer:
structure of KF - ionic
Explanation:
pls help ASAPPPP!!
BRAINLIEST
Answer:
a
Explanation:
first one i did the test trust me