How many moles is 2.80 × 1024 atoms of silicon? A. 4.65 mol B. 0.465 mol C. 2.15 mol D. 6.02 mol

Answer:

Fossils are remains or traces from ancient life's that is most likely buried in rocks anywhere in the world. Fossils are basically bones, teeth, shells, nests, leaf impressions, and footprints. That is technically explaining what our planet was like long ago. Some dinosaur fossils have been found. Paleontologists find them almost everywhere. If you don't know what Paleontologists are, they're basically people who study fossils. A lot of fossils are found in sedimentary rocks. Sedimentary is a rock that has been formed from things like sand, mud, and many other kinds of rocks.

Hope this helps.

Answer:

1.2 moles

Explanation:

this is the balanced equation for the reaction of oxygen (O2) and hydrogen (H2), usually we don't write the 1 in front of O2

2H₂ + 10₂ → 2H₂O

the molar ratio of hydrogen to oxygen is 2 : 1

we are trying to react with 2.4 mol of H2 so the moles of O2 is half the number of moles of H2 = 2.4 ÷ 2 = 1.2 mol

another way to think of it:

2H₂ + 10₂

2 : 1

2.4 mol : x mol

to get from 2 to 2.4 multiply by 1.2, so do the same to the other side

1 × 1.2 = 1.2 mol

Answer:

0.05263158 atm

Explanation: mmHg to Atmosphere Conversion Example. Task: Convert 975 mmHg to atmospheres (show work) Formula: mmHg ÷ 760 = atm Calculations: 975 mmHg ÷ 760 = 1.28289474 atm Result: 975 mmHg is equal to 1.28289474 atm. This is an example for how i got the answer.

Answer:

gonna check them rn :) youre not d u mb dont worry (:

Answer:

Is their a picture with the question?

Explanation:

Answer:

that the electromagnet can have a magnetic field when an electric current flows through it and disappears when the flow of the current stops, while permanent magnets are made up of magnetic material that can be easily magnetized and can create

Explanation:

Answer:

"Soaps are made from natural ingredients, such as plant oils (coconut, vegetable, palm, pine) or acids derived from animal fat. Detergents, on the other hand, are synthetic, man-made derivatives. While soap is limited in its applications, detergents can be formulated to include other ingredients for all sorts of cleaning purposes. Perhaps the most common and versatile of these ingredients are surfactants … surface active agents.

The main difference between soap and detergent is the ingredients. Soaps are made with biodegradable ingredients such as oils, lye and fats. ... Both clean clothes well, but detergents are more effective on stains and with brightening clothes. However, soap is kinder on the environment and skin. "

Hope this helps

Excerpt from textbook

Sulfur trioxide (triangular planar) formed by double covalent bonds, is a compound that presents polar bonds although the dipole moments associated with each bond are canceled by symmetry, resulting in apolar molecules.

It is a nonpolar molecule that contains one sulfur atom bonded to three oxygen atoms.

Therefore, we can conclude that SO3 is a nonpolar molecule due to its geometry (trigonal planar) and the absence of a lone pair of electrons.

Learn more about types of bonding present in the molecule SO3 here: https://brainly.com/question/17356017

Answer:

cold

Explanation:

because being cold helps to refresh my body personally

Answer:

hot

Explanation:

because I like to stay warm and take warm showers

Explanation:

The group 2 ions are in the second column in the periodic table, for example Be, Mg and Ca

The group 3 ions are in the third column in the periodic table, for example B, Al and Ga

It's the same thing for the rest of the groups

Ions either lose or gain electrons to have a full outer shell, just like the noble gases

metal atoms lose electrons from their outer shell to form positively charged ions

From groups 1 to 3 the charge is the same as the group number

Non metals gain electrons on their outer shell to form negatively charged ions

From groups 5 to 7 the charge is 8 subtract the group number

Example: what is the charge for group 6 ions?

8 - 6 = 2, and the charge is negative so 2-

Answer:

≈29.94 [°C].

Explanation:

all the details are in the attachment, the answer is underlined with orange colour.

Anabolism requires energy to grow and build.

Answer: NaCl and Na2SO4

Explanation: sorry if its wrong

Answer:

True

Explanation:

Answer:

There are 2.99 moles or 3 moles of Sulfur in 96 grams

Explanation:

You divide 96 by the atomic weight of Sulfur which is 32.065. For every 32.065 grams of Sulfur you will get 1 mole of Sulfur. The answer should be 2.99 or 3 moles of Sulfur.

Answer: Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.

Explanation:

Answer:

Our primary energy source is fossil fuels, with nuclear power and renewable energy sources rounding out the mix. These sources are mostly derived from our nearest star, the Sun. Electricity is classified separately because it is an energy carrier rather than a primary source.

Explanation:

I had that question before it was hard good luck :D

Answer:

its carbon

Explanation:

iron oxide + carbon = iron + carbon dioxide

as coke(mainly carbon) is a raw material gone into a blast furnace displaces iron.

Answer:

[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]

Explanation:

Here a reaction is given to us and we need to balance the equation . The given reaction is ,

[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]

So here , we can make a table as ,

[tex]\begin{array}{c|c} \\ LHS & RHS \\\\ Zn = 1 & Zn = 1 \\\\ SO_4 = 1 & SO_4 =1\\\\ Li = 2 & Li= 2 \\\\ CO_3 = 1 & CO_3 = 1 \end{array}[/tex]

We can see that the number of elements and ions is same on both LHS and RHS . Hence the reaction is already balanced .

Therefore the final reaction would be same as before that is ,

[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]

I hope this helps .

Answer:

How does non-human life in an urban ecosystem differ from that in an undeveloped forest ecosystem?

Explanation:

In forest eco system the people are uncivilized and not so much educated. And in urban eco system people are intelligent as well as educated this is the main reason. In an urban ecosystem, the only non-human life that live there are the ones that are able to survive under the conditions. However, in undeveloped forest ecosystems, there’s barely any pollution. Therefore, a bigger variety of non-human life is able to live here.

Mark brainliest if you can please :)

[tex]\bold{\huge{\blue{\underline{ Solution}}}}[/tex]

We have given in the question that,

We know that,

Amount of heat required = Mass * specific heat * change in temperature

[ Specific Latent heat of fusion is the amount of heat required to change one mole of substance from solid to liquid phase without changing in temperature .]

But, For complete melting of substance without change in temperature

Amount of heat required = Mass * Specific latent heat of fusion

Subsitute the required values,

[tex]\sf{\red{ Q = MCl}}[/tex]

Where,

Now,

[tex]\sf{ Q = 4 × 334000}[/tex]

[tex]\sf{ Q = 1336000 J }[/tex]

[tex]\sf{ Q = 1336 KJ }[/tex]

Hence, The amount of heat required to melt 4kg ice is 1336KJ

[tex]\bold{\red{ Option\: A \:is\: correct }}[/tex]

Taking into account the definition of calorimetry and latent heat, the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing in the expression for latent heat:

Q = 4 kg× 334,000 [tex]\frac{J}{kg}[/tex]

Solving:

Q= 1,336,000 J= 1,336 kJ (being 1,000 J= 1 kJ)

Finally, the correct answer is the first option: the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.

Learn more about calorimetry:

brainly.com/question/14057615?referrer=searchResults

brainly.com/question/24988785?referrer=searchResults

brainly.com/question/21315372?referrer=searchResults

brainly.com/question/13959344?referrer=searchResults

brainly.com/question/14309811?referrer=searchResults

brainly.com/question/23578297?referrer=searchResults

Answer:

Nylon, Cabon Fibre, High-Density Polythene.

If You Like My Answer Mark It As Brainliest.

The three synthetic fibers or plastics used by the canoeist are:

Synthetic fibers are defined as man-made textile fibers that are generated from chemical substances. Some of these man-made fibers are also derived from natural substances such as cellulose or protein.

Based on the given question, the three synthetic fibers or plastics used by the canoeist are:

Learn more on synthetic fibers here; https://brainly.com/question/25834689