Answer:
18.066 x 10^23 atoms of Au
Explanation:
ONE mole = 6.022 x 10^23 particles
3 x 6.022 x 10^23
what is civilization helpppp
Answer: Civilization is the stage of human social and cultural development and organization that is considered most advanced.
Explanation:
BEST ANSWER :
a civilisation is a complex human society, usually made up of different cities, with certain characteristics of culture and technological development
Which of the following has more than one kind of monomer in its repeating unit? homodimer copolymer codimer homopolymer
Copolymer have more than one kind of monomer in its repeating unit.
What are Copolymers ?Those polymers that have more than one kind of monomer in its repeating unit are called Copolymers.
These are useful to modify the properties of polymers that needs more strength , durability etc.
It is a way of improving mechanical properties of a polymer .
A copolymer formed from two dissimilar molecules (as two olefins) is a codimer and the homopolymer and homodimer as the name suggest are made of one similar kind of monomers.
Copolymer have more than one kind of monomer in its repeating unit.
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The equation shows the overall chemical reaction for photosynthesis, the process that plants use to make food from sunlight. Which statement explains why this is an endothermic reaction? 6CO2 + H2O + energy ---> C6H12O6 + 6O2
A) Water is one of the reactants.
B) A gas is released as one of the products.
C) The sugar dissolves in water.
D) Energy in the form of sunlight must be added.
During photosynthesis green plants use solar energy to produce fuel hence 'Energy in the form of sunlight must be added' that is option D is the correct option.
Why is photosynthesis an endothermic reaction?Photosynthesis is an endothermic reaction because green plants use solar energy in the form of sunlight, along with water and carbon dioxide in the air, to produce their food in the form of glucose.
Endothermic reactions are chemical reactions where the reactants utilize heat energy from the surroundings to form products.
Since energy as sunlight is used in the photosynthesis reaction, 'Energy in the form of sunlight must be added' that is option D is the correct option.
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If 0.5 L of a gas is cooled from 22°C to 4°C, what is the new volume of the gas?
ОА
0.02 L
B
0.47 L
С
0.60 L
D
2.75 L
Answer:
B
Explanation:
From charles' law,
[tex]v \alpha t[/tex]
where v is volume and t is absolute temperature
[tex] \frac{v1}{t1} = \frac{v2}{t2} [/tex][tex]v1 = 0.5l \\ t1 = (22 + 273 )k\\ t2 = (4 + 273)k \\ t1 = 295k \\ t2 = 277k \\ \frac{0.5}{295} = \frac{v2}{277} \\ v2 = 277 \times \frac{0.5}{295} = 0.47l[/tex]Hence that's it6. Which describes particles or electromagnetic radiation emitted from the nucleus during
radioactive decay ?
a) harmless nuclear fallout
b) nuclear radiation
c) transmutation
d) daughter nuclides
Answer:
A harmless nuclear fallout
Explanation:
just did this
crude oil is in soild form true or false
Answer:
false
Explanation:
it is a complex mix of hydrocarbons that caan only occur in liquid, gaseous, or solid form. Crude oil is often liquid form. But also includes gas and solid's known as which is found only in certain sands, so false is you're answer.
Points + Brainalist
Answer:
I think A it looks to be the answer
Explanation:
sorry if wrong
Points + brainalist
Answer:
the total mass of product is equal to total mass of the reactance
Specific Heat Practice
1. How much heat energy is needed to raise the temperature of 540 g of water from 32.00C
to 95.00C? (C=4.186 J/gºC)
Answer:
See below
Explanation:
Specific Heat of water = 4.186 J/(g-C)
J/(g-C) multiplied by g and C results in J
4.186 * 540 * (95-32) = 142 407 .72 J
A volume of saline solution had a mass of 61.4 g at 4°C. An equal volume of water at the same
temperature had a mass of 59.0 g. What is the density of the saline solution? (Density of water at 4°C
is 1.00 g/cc.)
____ g/cc
Which of an Adams electrons are involved in chemical reactions
Answer:
The electrons farthest from the nucleus of the atom.
hope this helps!
For a plane to make a turn , a .......is required to change the motion in direction of that turn.
Answer: The answer is force.
Explanation:
Newtons 3rd law is from an action, there should be a reaction. so the planes moving it turns with force. ( this ould get a Brainliest answer)
Convert 19 kcal into joules
[tex]19~ \text{kcal} = 19 \times 1000 ~\text{cal } = 19000~ \text{cal} = 19000 \times 4.184~ \text{J} = 79496~ \text{J}[/tex]
What is the pH of a solution with (OH1-) = 1 x 10-4 M?
Answer: The concentration for pH is 4 but, for pOH it is 10.
A brainliest please?
Match the properties to the types of compounds they characterize.
Drag each label to the correct location on the table,
lonic Compounds
Metallic Compounds
Both
FREEBIE
The correct match of the compounds to their characters are:
Ionic compound: made of positive-negative ion and break into pieces easily.
Metallic compound: can be hammered into different shapes and conduct electricity.
Both: are held together with opposite ions, the high boiling point.
What are compounds?Compounds are made up by mixing two or more metals or non-metals.
Different compounds have different chemical properties.
Thus, the Ionic compound: is made of positive-negative ion and break into pieces easily.
Metallic compound: can be hammered into different shapes and conduct electricity.
Both: are held together with opposite ions, the high boiling point.
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Why transport number of a cation increases with temperature while an anion decreases with temperature
Answer:
0.5
Explanation: (3) Factors affecting transport number (i) Temperature: A rise in temperature tends to bring the transport number of cation and anion more closely to 0.5
Water is the universal solvent and we have seen how salts, like NaCl, dissolve in water. Many other molecules dissolve in water as well: sugar is a good example. A salt solution will conduct electricity but a sugar solution will not. Let's use the sugar, sucrose, as an example that readily dissolves in water, but the solution does not conduct electricity. Compare this dissolving process of sucrose with that of NaCl to explain why one is an electrolyte and the other is not. Choose ALL that apply.
Answer:
Explanation:
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
2.00L of gas is collected at 25.0 C and 745.0 mmHg What is the volume of this gas at STP?
Answer:
1.79
Explanation:
I really need help with this. Be serious. If you answer something random just for the points I will report you to brainly.
Answer:
It get thicker beacause the mid ocean
Explanation:
Because when it gets moved back the heat rises and it builds up to be thicker.
Critically discuss the refusal/unwillingness of some individuals to answer questions to put them by authorized Stats SA officials
People refuse to answer questions from authorized Stats SA officials because they don't want to reveal confidential information.
What does official stats refer to?An official Stats is an official who has the function of asking citizens for different information in order to establish general statistics for all citizens.
Why don't people answer your questions?Some people refuse to answer questions out of mistrust, because they don't want to share personal information.
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Carlos is making phosphorus trichloride using the equation below.
2P +3Cl2 → _PC13
What coefficient of PClz would show that the law of the conservation of mass is represented in the chemical
equation?
4
3
2
Answer:
C.) 2
Explanation:
Chemical equations, in a way, can be seen as algebraic equations. Cl2 is a molecular structure, so, there are two Cl atoms. 3Cl2 means 3, Cl2 molecules. So, if we think of it as adding up all the atoms, we will get, 2 P atoms and 6 Cl atoms. Now to convert. The Law of the Conservation of Mass basically says you can't add or subtract atoms out of nowhere, so the number of atoms has to stay the same when it's being converted. We need to place a coefficient with PCl3. If we look at PCl3, it shows us that there are three Cl atoms and one P atom. And looking back at how many atoms there were on the left side of the equation, we just need to double the atoms of atoms so it will be equal. So, the answer is C.) 2
BRAINLIEST PLEASE!!
Answer:
the answer is C
Explanation:
why we breath in oxygen but not nitrogen which is having big percentage
Answer:
Breathing an atmosphere of pure oxygen would damage the delicate tissues and blood vessels in our lungs, so it's a good thing that most of our atmosphere is nitrogen.Nitrogen is a fairly inert chemical (it does react, but not nearly as much as oxygen - this is why it is fairly stable in the atmosphere, whereas oxygen has to constantly be regenerated by photosynthesis).
Hope it Helps :))
1. What is the total mass if you add 6.00g + 30.0mg + 0.50kg.
Answer:
0.50603kg when you add given masses
If the balanced chemical reaction for the formation of Li2O is 4 Li(s) + O2(g) → 2 Li2O(s), how many molecules of Li2O(s) would you produce if you used up 6 atoms of Li(s)?
The molecules of Li₂O that would produce if you used up 6 atoms of Li(s) is 3.
What is Lithiumdioxide?It is an unstable inorganic and radical compound, used in the manufacture of glass and ceramic.
The balanced equation
[tex]\rm 6 Li(s) + O_2(g) \rightarrow 3 Li_2O(s)[/tex]
If the atoms of lithium moves up to 6 the lithium oxide molecules will be 3, as you can see in the equation.
Thus, the molecules of Li will be 3.
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in the
H2O is the Lewis
following reaction.
SO3(aq) + 2H2O(1)
H2SO3(aq) + 2OH-(aq)
A
B
acid
Answer: An acid-base reaction is the transfer of a proton from a proton donor ... The reaction between a Brønsted-Lowry acid and water is called acid ionization.
Explanation:
An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost
electrons is called:
Electron configuration
Periodic table
Isotope configuration
Valance electrons
An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost is called Electronic configuration.
What is electronic configuration?Electronic configuration is the arrangements of electrons in the orbitals of an atoms and this shows the total number of atoms present in the atoms orbits and it shows the different energy levels around an atomic nucleus.
Therefore, An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost is called Electronic configuration.
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A man takes 600 mg ibuprofee tables for pain and swelling related to an anide spazin The mediamber of tablets he can
take in a 24 h period to reach the maxime daily dose is 4 tablets. What is the maximum daily dose is ligams?
mati daily doses
Answer:
what is your questions I didn't understand
Ascorbic acid (vitamin c), along with many other reputed properties act as an antioxidant. The following equation illustrates antioxidant properties H2C6H606 C6H6O6 + H2 a. What is an antioxidant b. Assign oxidation numbers
Antioxidants are the substance that prevent oxidation process in a cell, oxidation produce free radical, and free radicals harm the cell. The oxidation number is the count of electrons present in an atom.
What is ascorbic acid?Ascorbic acid (vitamin C) is a water-soluble vitamin that is present in the citrus fruits and vegetables.
Ascorbic acid act as an antioxidant and prevent the production of free radicals in a cell.
Thus, Antioxidants are the substance that prevent oxidation process in a cell, oxidation produce free radical, and free radicals harm the cell. The oxidation number is the count of electrons present in an atom.
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Calculate the number of hydrogen atoms in 58.1 grams butane.
This question involves the concepts of molar mass and molecular formula.
The number of hydrogen atoms in 58.1 grams butane are "10".
No. of Hydrogen AtomsThe molecular formula of butane is C₄H₁₀. And the molar mass of butane is 58.1 grams. Molar mass id the mass of the single molecule of a compound. Hence, it is very clear from the molecular formula and molar mass of butane that 58.1 grams of butane contains 10 atoms of hydrogen. Mathematically,
58.1 grams butane contains = 10 hydrogen atomsLearn more about molar mass here:
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Select the structure that corresponds
to the following name:
2,2-dimethylpropanal
A.
B.
CHO
CH3
CH3CCHO
CH
C. both
CHO - propanal = aldehyde
A. Skeleton Structure
B. Molecular structure
The second structure corresponds to the 2,2-dimethylpropanal molecule as it is C₅H₁₀O. Thus, option B is correct.
What is molecular structure?A molecular structure is a representation of the atoms and the molecules of the compound along with their numbers. It is different from the skeletal structure as it does not shows an overview of the chains and branches.
2,2-dimethylpropanal is an aldehyde-containing molecule that contains 5 carbon, 10 hydrogens, and one oxygen atom in its formula and is best represented in figure B.
Therefore, figure B shows 2,2-dimethylpropanal.
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