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A student collected the data shown above. Row A may represent error
B
C
D
E

Answer:

293°C

Explanation:

20°C+273=293°C

Answer:

Is their a picture with the question?

Explanation:

Answer:

Polystyrene and plastic foam are both used as insulators as they have small air bubbles trapped inside them. This makes them very good insulators because heat energy can't flow through them

Explanation:

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

Answer:

Here is your answer

Explanation:

Please mark me brainliest

If the chemist has 35.0 g of Na, then 26.94 grams of chlorine is required to react completely with the sodium.

Number of moles of any substance can be calculated as [tex]${\rm{n = }}\frac{{\rm{W}}}{{\rm{M}}}$[/tex].

Where, W = given mass

M = molar mass

Balanced equation for the formation of NaCl can be written as:

[tex]${\rm{2N}}{{\rm{a}}_{{\rm{(s)}}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}_{{\rm{(g)}}} \to {\rm{2NaC}}{{\rm{l}}_{{\rm{(s)}}}}$[/tex]

Here the ration of Na and Cl is 2:1.

No. of moles of Na = 35/23 = 1.52 mole

If 2 moles of Na is consumed by 1 mole of Cl, then 1 mole of Na is consumed by half mole of Cl.

Mole of Cl required to consume 1 mole of Na = 1.52/2 = 0.760 mole.

Now used mass of Cl can be find out by using the formula of moles as follow:

W = 35.45 × 0.760 = 26.94 grams

Hence, 26.94 grams of Cl is required to completely react with 35.0 grams of Na.

To learn more about moles, visit the below link:

https://brainly.com/question/15356425

Answer:

54

Explanation:

trust me its what it told me the expert verified confusing

Answer:

i guess answer is 0.0600

Explanation:

Here,

Density=0.791g/cm^3

Volume=75.89ml

So,

Mass=Density*Volume

=0.791g/cm^3×75.89ml

=60.02g/cm^3.ml

Expressing them in kg

60.02/1000

=0.0600 kg

Answer:

natural selection

Explanation:

The process that results in changes to the genetic material of a population over time

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:

An important example of chemical potential energy is the energy stored in the food that you eat. Inside your body, this food is distributed around your body and is reacted in your cells to release the energy stored in the chemical bonds.

Explanation:

[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:

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Answer:

Answer:

➢ There are eight lone pairs of electrons in each of the three resonance structures of NO3- ion. These eight lone pairs are provides by three oxygen atoms. There are no lone pairs on nitrogen atom.

[tex]Into \: your Arms[/tex]

#CarryOnLearning

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 :)

Answer:

             27.025 g of H₂O

Explanation:

The Balance chemical equation is

                                   2 H₂ + O₂ = 2 H₂O

Step 1: Calculate Limiting Reagent

Moles of H₂

                        Mole = 16 g / 2.02 g/mol = 7.937 mol

Moles of O₂

                        Mole = 24 g / 32.00 g/mol = 0.750 mol

Mole ratio of H₂ : O₂ is 2 : 1. Hence, 7.937 mol of H₂ will need 3.9685 mol of O₂. This means O₂ is limiting reagent.

Step 2: Calculate Moles of H₂O

0.750 mol of O₂ will produce 1.50 mol of H₂O because the mole ratio of O₂ : H₂O is 1 : 2.

Step 3: Calculate mass of H₂O

                          Mass = 1.50 mol × 18.02 g/mol = 27.025 g of H₂O

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:

I believe its an NH4^+ ion & an NO3^- ion

Explanation:

hope this helps!

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:

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.

Anabolism requires energy to grow and build.

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:

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:

prepare

Assemble a disaster supply kit.

Locate safe places in your home for each type of disaster.

Determine the best evacuation routes from your home.

Become trained in first aid and CPR.

Show each family member how and where to shut off utilities (water, gas, electricity).

Explanation: