According to Figure 25-2, is the Sun brighter than white dwarfs? 100 pointws will mark brainliest

Answer: 8 moles of Fe

Explanation:

If 2 moles oxide give 4 moles Fe, so 4 moles oxide gives 8

According to stoichiometry and mole concept,1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important while balancing chemical equations.

In the given example, as 1 molecule of nitrogen produces 2 molecules of ammonia

∴2 x 10¹⁰ molecules of ammonia will be produced when 2 x 10¹⁰×1/2=1×10¹⁰ molecules .

Thus, 1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.

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Answer:

a. Each set of elements was arranged in special coloumns based on their mass.

Answer:

yes

Explanation:

bc i wanted to know how they taste btw they taste like metal not good 5/10

might try again but not recommended

my favorite one is a quarter probably

Answer:

MgSO4 + 6H2O ----> MgSO4.6H2O

2C + O2 -----> 2CO

2CuO + C ------> 2Cu + CO2

C2H6 -----> C2H4 + H2

ZnO + C -----> Zn + CO

NiCO3 ------> NiO + CO2

CO2 + 2H2 ------> CH4 +O2

NaOH + HNO3 -----> NaNO3 + H2O

C2H6 --------> C2H4 + H2

Explanation:

Answer:

A true universal solvent does not exist. Although water is considered to be a the "universal solvent" it only dissolves other polar molecules. It does not dissolve nonpolar molecules, including organic compounds such as fats and oils. It is only called so because it can dissolve many more than other liquids.

Answer:

whats the question so i can answer?

Answer:

Explanation:

Newtons 1st law:

If you slide a hockey puck on ice, eventually it will stop, because of friction on the ice. It might also stop if a hockey player places their stick in front of it.

Newton's 2nd law:

If the mass of an object is 20 kg and it's acceleration is 5 m/s, the force acting upon it is (m*a or 20*5) 100 N.

Another example that proves that force is dependent upon mass is that if you were to move a car and a truck (that were both previously stationary) at the same speed, the car would take less force/effort to move than the truck.

Newton's 3rd law:

If a book on a table, the table is exerting a force on it that is equal and opposite to the force of gravity.

If two soccer balls of the same mass collide, one moving and one stationary, then they would both apply an equal and opposite force onto each other, causing the moving ball to stop and the previously stationary ball to move at the speed of  the previously moving ball.

Answer:

D. Keq: [SO3][NO] /[SO2]NO2]

Explanation:

Hello!

In this case, according to the process to set up equilibrium expressions for chemical reactions at equilibrium, we realize we need to write up the concentration of products on top and that of reactants on bottom; thus, for there chemical reaction herein specified, we obtain:

[tex]Keq=\frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]

Thereby, the answer is D. Keq: [SO3][NO] /[SO2]NO2].

Best regards!

Answer:

D

Explanation:

Answer:

There are many examples of fossils found on separate continents and nowhere else, suggesting the continents were once joined. If Continental Drift had not occurred, the alternative explanations would be:

The species evolved independently on separate continents – contradicting Darwin’s theory of evolution.

They swam to the other continent/s in breeding pairs to establish a second population.

fossil evidence

Image: From This Dynamic Earth: The Story of Plate Tectonics p8

Remains of Mesosaurus, a freshwater crocodile-like reptile that lived during the early Permian (between 286 and 258 million years ago), are found solely in Southern Africa and Eastern South America. It would have been physiologically impossible for Mesosaurus to swim between the continents. This suggests that South America and Africa were joined during the Early Permian.

Cynognathus is an extinct mammal-like reptile. The name literally means ‘dog jaw’. Cynognathus was as large as a modern wolf and lived during the early to mid Triassic period (250 to 240 million years ago). It is found as fossils only in South Africa and South America.

lystrosaurus Lystrosaurus

Lystrosaurus - which literally means ‘shovel reptile’ - was dominant on land in the early Triassic, 250 million years ago. It is thought to have been herbivorous and grew to approximately one metre in length, with a stocky build like a pig. Fossils of Lystrosaurus are only found in Antarctica, India and South Africa.

Glossopteris was a woody, seed-bearing shrub or tree, named after the Greek descripton of ‘tongue’ – a description of the shape of the leaves. Some reached 30m tall. It evolved during the Early Permian (299 million years ago) and went on to become the dominant species throughout the period, not becoming extinct until the end of the Permian. Fossils are found in Australia, South Africa,South America, India and Antarctica.

When the continents of the southern hemisphere are re-assembled into the single land mass of Gondwanaland, the distribution of these four fossil types form linear and continuous patterns of distribution across continental boundaries.

Explanation:

Answer:

Explanation:

All of above except carbon dioxide

The compound that is held together by ionic bonds are CaCl₂,  NaCl, sodium bromide, and FeBr₃. The correct options are A, C, D, and F.

Ionic bonds are electrovalent bonds. These bonds are formed when two or more atoms lose electrons or gain electrons to form an ion. Ions are opposite charges that attract each other. Ionic bonds are formed in both metals and non-metals.

CaCl₂, calcium chloride, is formed between metals and non-metals. Some more examples are NaOH – Sodium Hydroxide, NaHCO₃—Sodium Hydrogen Carbonate, etc.

An example is NaCl, is sodium has 11 atomic numbers. Chloride has 6 electrons in its outermost shell. They will share electrons with each other to make the noble gas configuration.

Thus, the correct options are A. CaCl₂, C. NaCl, D, sodium bromide, and F. FeBr₃.

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Answer: 2.8 moles of copper (Il) sulfide [tex](CuS)[/tex] will be produced from 2.8 moles of sulphur.

Explanation:

The balanced chemical reaction is:

[tex]Cu+S\rightarrow CuS[/tex]  

According to stoichiometry :

1 mole of [tex]S[/tex] produce =  1 mole of copper (Il) sulfide [tex](CuS)[/tex]

Thus 2.8 moles of [tex]S[/tex] will produce=[tex]\frac{1}{1}\times 2.8=2.8moles[/tex] of copper (Il) sulfide [tex](CuS)[/tex]

Thus 2.8 moles of copper (Il) sulfide [tex](CuS)[/tex] will be produced from 2.8 moles of sulphur.

Answer:

Explanation:

SADOPOAKAWAASDASWDWSDWAA

Answer:

4

Explanation:

Got it right edge 2021

Answer:

4 or C

Explanation:

i took the quiz

Answer:

Kindly check the explanation section.

Explanation:

Based on the description of the reacting -OH group containing Compound, the drawing of the chemical compound is given in the attached picture.

So, without mincing words let's dive straight into the solution to the question.

The reaction between the OH containing compound and PCC is an oxidation reaction.

Looking at the carbon number 1 which the first OH group and CH3 are attached to. Oxidation can not occur here as tertiary alcohol can not be oxidize.

Hence, the second OH will be oxidized into a carbonyl group, C = O. Kindly note that when alcohol oxidizes it turns into an aldehyde.

The equation for the reaction is also given the the attached picture.

Answer:

d. positron

that's the answer brainly tells me I need to write at least 20 characters and that's d u m b.

Answer:

610,000

Explanation:

When the radio station transmits on AM 610, so the number of hertz (Hz) is the frequency of the wave is 610,000.

Since radio station transmits on AM 610

We know that

1khz = 1000 hz

So it should be like

= 610 (1000)

= 610,000

hence, When the radio station transmits on AM 610, so the number of hertz (Hz) is the frequency of the wave is 610,000.

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Answer:

7.35 - 7.45

Explanation:

The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually, the body maintains the pH of blood close to 7.40.

Hope this helps

Answer:

The normal pH range if a base is more than 7

Explanation:

Basideally the pH range goes from 0-14 in which

Acidic range is :0-7

Neutral :7

Base : 7 - 14

Answer:

4.4 g

Explanation:

Step 1: Write the balanced equation

Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O

Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP

At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.

3.2 L × 1 mol/22.4 L = 0.14 mol

Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂

The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.

Step 4: Calculate the mass corresponding to 0.070 moles of Cu

The molar mass of Cu is 63.55 g/mol.

0.070 mol × 63.55 g/mol = 4.4 g

Given :

Number of moles of CHF₃ is 1.7 .

Solution :

We know, 1 mole of any complex contains 6.022 × 10²³ molecules.

Let, 1.7 moles of CHF₃ contains n numbers of molecules.

So, n = 1.7 × 6.022 × 10²³ molecules

n = 10.2374 × 10²³ molecules

n = 1.0237 × 10²³ molecules

Hence, this is the required solution.

Answer:

dihydrogen monoxide. The 2 is the subscript for H symbolises the presence of 2 Hydrogen atoms.

Explanation:

Answer: If we want to represent two atoms of hydrogen, instead of writing H H, we write H2.

Explanation:

The subscript "2" means that two atoms of the element hydrogen have joined together to form a molecule. A subscript is only used when more than one atom is being represented. ... Some more common molecules and their chemical formula.

Answer: A. absorbs

Explanation:

Answer:

Symbol is Sn

Explanation:

From the periodic table, the element that has an ionic number of 50 and electronic structure of 1s² 2s² 2p^(6) 3s² 3p^(6) 3d^(10) 4s² 4p^(6) 4d^(10) 5s² is known to be Tin.

The symbol for Tin is written as Sn

Answer:

The atomic number is 48 and Tin has an electron of 48 which means 2 electrons were donated during the chemical reaction.

The element is referred to as Tin(Sn) and the symbol is Sn²⁺

Tin is referred to as a metal . All metals lose or donate electrons to become positively charged because their outermost shells are usually very far from the nucleus.

On the other hand non metals accept or gain electrons to become negatively charged  as their outermost shells are closer to the nucleus.

Tin however donated two electrons as a metal and became positively charged hence the symbol Sn²⁺

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Answer: Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]

Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]

Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]

Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]

Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]

Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]

Explanation:

The name of the ionic compounds is written by writing the name of the cation first followed by its oxidation state in round brackets and then the name of the anion is written without any suffix. Thus the cation is written first followed by the oxidation state and then the anion.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced.  Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral compound.

Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]

Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]

Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]

Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]

Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]

Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]

Answer:

freezing

Explanation:

when objects are in liquid for, molecules are not moving as rapidly as when an object is in solid form

Answer:

evaporation :)

Explanation:

Answer:

Molar mass of O is = 16

Molar mass of O2 = 32

Explanation:

What factors affect purity?

A1: The key parameters that can be controlled in an emew cell are current density, flow rate, electrolyte temperature, and plating time. The current density controls the production rate, while the flow rate, temperature, and plating time can all have an impact on the product

What factors affect yield?

The yield and rate of a chemical reaction depend on conditions such as temperature and pressure. In industry, chemical engineers design processes that maximise the yield and the rate at which the product is produced. They also aim to reduce waste and energy costs at all stages of the process.

HOPE THIS HELPS YOU THANK YOU.

Answer:

There are 1.205x10²³ particles in 0.2 moles.

Explanation:

In order to convert from moles to number of particles we need to use Avogadro's number, which states the number of particles contained in 1 mol:

Thus, there are 1.205x10²³ particles in 0.2 moles.