what is marble formed from A. obsidian B. granite C. limestone

The amount remaining after 36 years is 5 g

n = t / t½

n = 36 / 12

n = 3

N = N₀ / 2ⁿ

N = 40 / 2³

N = 40 / 8

N = 5 g

Therefore, the amount remaining after 36 years is 5 g

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Convert 25° Celsius to Fahrenheit.

77° F

The formula to convert Celsius to Fahrenheit is :-

[tex] \tt {F \: = {C \times ( \frac{9}{5} ) + 32}}[/tex]

-----------------------------------------------------------

Given, C = 25

=> F = 25 × (9/5) + 32

=> F = 45 + 32

=> F = 77

Answer:

[tex] \boxed{\tt 25{}^{\circ} C = 7 7 {}^{ \circ} F}[/tex]

Explanation:

Question:

To Convert 25°C to Fahrenheit scale

Here, °C means Celsius

Given:

The value of Celsius, i.e. 25

Solution:

In relation

[tex]\boxed{ \rightarrow \tt \cfrac{{}^{\circ}C }{5} = \cfrac{ {}^\circ F-32}{9}} [/tex]

Now put the value of Celsius: [25]

[tex] \tt \implies \cfrac{25}{5} = \cfrac{ F-32}{9} [/tex]

Now Find the value of F. That would be the Fahrenheit.

Steps:

Cross Multiply:

[tex]\tt \implies25 \times 9 = 5(F-32)[/tex]

Simplify the LHS and apply Distributive property for RHS:

[tex]\tt \implies225 = 5 \: F - 160[/tex]

Flip this equation:

[tex]\tt \implies5 F - 160 = 225[/tex]

Add 160 to both sides:

[tex] \tt \implies5 F - 160 + 160 = 225 + 160[/tex]

Simplify:

[tex]\tt \implies5 F - 0 = 385[/tex]

[tex] \tt \implies \: 5 F = 385[/tex]

Divide both sides by 5:

[tex]\tt \implies \cfrac{5F}{5} = \cfrac{385}{5} [/tex]

Use Cancellation method to cancel LHS and RHS:

[tex]\tt \implies \cfrac{ {}^{1} {}^{} \cancel{5}F}{ {}^{1} \cancel5} = \cfrac{ {}^{77} \cancel{385}}{ {}^{1} \cancel5} [/tex]

[tex]\tt \implies1F = 77[/tex]

[tex]\boxed{\tt \implies{ {}^{ \circ} F} = 77}[/tex]

Hence, 25°C is equal to 77°F .

[tex] \rule{225pt}{2pt}[/tex]

Answer:

2.52[tex]x10^{23}[/tex] atoms*

Explanation:

[tex]\frac{0.419mol}{1} *\frac{6.02*10^{23}atoms }{1 mol} =2.52238x10^{23}[/tex]atoms

*i put the answer in correct sig figs(significant figures) in case your teacher is like mine and wants answers like that

Answer:

A uniform temperature distribution is a MACROscopic property where the temperature is measured to be the same throughout the volume measured. An ideal gas with a uniform temperature distribution would have a Bellman distribution of kinetic energy of microscopic particles.

Explanation:

I am walter white

The pressure of the gas that has 3.00mol sample of CO2(g) is in a rigid 6.00L container at 400°C is 27.6atm.

The pressure of a gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

P × 6 = 3 × 0.0821 × 673

6P = 165.76

P = 165.76 ÷ 6

P = 27.6atm

Therefore, the pressure of the gas that has 3.00mol sample of CO2(g) is in a rigid 6.00L container at 400°C is 27.6atm.

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Answer:

Please see below

Explanation:

Organic acid - An organic acid is an organic compound with acidic properties. Organic acids should include amino acids, fatty acids, ketoacids, and a variety of other endogenous and exogenous acids.

Dilute acid - A dillute acid is an acid which has water in a ratio of 90:10 90 water and 10 acid.

Indicator -  a substance (as a dye) used to show visually (as by a change in color) the condition of a solution with respect to the presence of a particular material

Neutralization - the reaction of an acid and a base forming a salt and water.

Acid rain - rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids.

The flame colour produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.

A flame test is a test used to identify metal ions in solution due to the characteristic colour the flame produces.

Flame colors are produced when the electrons in the metal ions present in the compound move between energy levels after excitation.

The difference in the colour of the flame depends on the difference in the energy levels of the electrons moving.

A solution of Cu(NO3)2 contains Cu2+ ions.

Cu2+ ions gives a deep green coloured flame.

A solution of Na2SO4 contains Na+ ions.

Na+ ions give a golden yellow-coloured flame.

A solution of Li3PO4 contains Li+ ions.

Li+ ions gives a red-coloured flame.

A solution of Ca(C2H3O2)2 contains Ca2+ ions

Ca2+ ions gives a brick red-coloured flame

Therefore, the colour of the flame produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.

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Molarity

[tex]\\ \tt\hookrightarrow \dfrac{1.3}{0.42}=3.09M[/tex]

Now

[tex]\\ \tt\hookrightarrow \Delta T=K_f\times m\times i[/tex]

[tex]\\ \tt\hookrightarrow \Delta T=1.86(3.09)(2)=11.5°C[/tex]

Answer:

2 C2H2 + 5 O ---> 4 CO2 + 2 H2O

Explanation:

combustion reactions always end with CO2 + H2O

and you can use this website to balance out equations when you're stuck

https://en.intl.chemicalaid.com/tools/equationbalancer.php?equation=C2H2+%2B+O2+%3D+CO2+%2B+H2O

Answer:

I believe your answer is D. The use of light that has a lower frequency.

Hope this helped!

Answer:

Answer A

Explanation:

Because that method is important to help the scientist

It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results. Therefore, option A is correct.

The term scientific method is defined as the process of objectively establishing facts through testing and experimentation.

The basic process including making an observation, forming a hypothesis, making a prediction, conducting an experiment and finally analyzing the results.

The Scientific Method is a process used to confirm observations while minimizing observer bias. Its goal is for research to be conducted in a fair, unbiased and quotable manner.

Thus, It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results, option A is correct.

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The amount of  Na₂SO₄ would be 15.09 grams

From the equation of the reaction:

4NaOH + 2H₂SO₄ --> 2Na₂SO₄ + 4H₂O

Mole ratio of NaOH and Na₂SO₄ = 2:1

Mole of 8.50 grams of NaOH = 8.50/40

                                                 = 0.21 mole

Equivalent mole of Na₂SO₄ = 0.21/2

                                              = 0.11 mole

Mass of 0.11 mole Na₂SO₄ = 0.11 x 142.04

                                             = 15.09 grams

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Answer:

is it 500 g

Explanation:

cause m stands for mass

To find the amount of heat produced, the value of m which we plug is 500 grams.

Amount of heat absorbed or released during any chemical change will be calculated as:

Q = mc∆T, where

Q = absorbed or released heat

m = mass of substance

c = specific heat of substance

∆T = change in temperature

So, according to question to calculate energy in place of m we will put the given mass of aluminum which is equal to 500g.

Hence required value of m is 500g.

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Answer:

b

Explanation:

use Avogadro's number to convert molecules to moles

1 mole is equal to 6.023 × 10 ²³ molecules. 7.56 moles of carbon dioxide (CO2) are equivalent to 4.55 X 10^24 molecules.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 mole of any substance = 6.023 × 10²³molecules

1 mole of carbon dioxide = 6.023 × 10²³molecules

Then  4.55 X 10^24 molecules of CO₂ =  4.55 X 10^24 × 1 mole / 6.023 × 10²³

= 7.56 moles

Thus, 7.56 moles of carbon dioxide (CO2) are equivalent to 4.55 X 10^24 molecules.

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Answer:

Around 1260 hours

Answer:

1260 hours

Explanation:

Depending on your location, different states have different school hours and holidays. However, lets just assume it's the average. The average high school has 180 days of school each year with 7 hour school days.

180(7) = 1260 hours

Of course, this does not account for time spent at home studying, doing homework, tutoring, or other things of the sort.

Answer:

Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy, and clean air, water, and soil. Chemical technologies enrich our quality of life in numerous ways by providing new solutions to problems in health, materials, and energy usage

Answer:

▪Why Is chemistry important in industry?

[Chemistry helps our industry produce more materials—such as paints, plastics, iron or steel, cement, kerosene, and also motor oil. Chemistry also helps farmers to enrich the soil with chemicals ... to grow fresh vegetables.] Chemistry is important, especially in household things like condoms, cleaning, and cooking.

▪10 Reasons Why Chemistry Is Important

➢Chemistry helps explain everything.

➢Being interested in chemistry opens up career options.

➢Chemistry helps people develop strong analytical skills.

➢Understanding chemistry keeps people safe.

➢Chemistry helps protect the environment.

➢Chemistry is used in law.

➢Chemistry is used in the food industry

➢Chemistry is important in agriculture

➢Chemistry is used in medicine

➢Chemistry is important for space travel

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#CarryOnLearning

Explanation:

.

.

Answer:

Having too much carbon dioxide in the body can cause nonspecific symptoms like headache, fatigue, and muscle twitches. Often, it clears up quickly on its own. With severe hypercapnia, though, the body can't restore CO2 balance and the symptoms are more serious

Explanation:

The mass number for an atom of barium containing 56 protons and 82 neutrons is calculated by adding the number of protons and the number of neutrons which is 138.

In this case, the atomic number of barium is 56, which means it has 56 protons. The number of neutrons is given as 82.

To find the mass number, simply add the number of protons and the number of neutrons together:

Mass number = Protons + Neutrons

Mass number = 56 + 82

Mass number = 138

Therefore, the mass number for an atom of barium containing 56 protons and 82 neutrons is 138.

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Answer:

: B, if it is produced in an earlier step. Which term refers to a substance that is formed in one step of a reaction mechanism and consumed in a subsequent step of the reaction mechanism? D: reaction intermediate

Explanation:

pa brainlyes po kailangan lang talaga

Answer:

its D

Explanation:

trust

Answer: Aqueous Ammonium Chloride

Explanation: When you disintegrate ammonium chloride crystal in water (H2O), the ammonium chloride compound decomposes into allure component ions: NH4+ and Cl-. The detachment related series of events is: NH4Cl(complete) = NH4+(liquid) + Cl-(liquid).

Answer:

E.)3p,4s,4d

Explanation:

In order as: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p… 1s will be filled first, with the maximum of 2 electrons. 2s will be filled next, with the maximum of 2 electrons. 2p will be filled next, with the maximum of 6 electrons.

B) 3p, 4s, 3d

hope this helped

Answer:

500

Explanation:

from the average and if yoy multiple and then add your % and x you would get 500 to 600

Answer:

Chemical weathering occurs when water dissolves minerals in a rock, producing new compounds. ... Hydrolysis occurs, for example, when water comes in contact with granite. Feldspar crystals inside the granite react chemically, forming clay minerals. The clay weakens the rock, making it more likely to break.

Carbonation-As rain goes through the air and into the ground, it grabs carbon dioxide, creating carbonic acid. This weak acid reacts with the calcium carbonate in stones when it seeps into the cracks.

Oxidation- Rust forms when the iron or steel in your car reacts with the oxygen in the air to form iron oxide. The resulting red substance can be quite brittle, so much so that you could literally poke a hole in it with your finger. Rocks with iron can go through the same process, too.

Hydration- Hydration is a type of chemical weathering where water reacts chemically with the rock, modifying its chemical structure.

Acidification-Acid rain is water with sulfuric and nitric acids from the burning of coal and fossil fuels, along with volcano eruptions. The acids create a reaction when they hit the stone, causing the surface to wear and the composition to soften. Acidification can also be caused by organisms like lichens, which are created from algae and fungi.

The colour of the phenol red-containing solution would shift toward yellow.

Carbon dioxide is a colourless and acidic gas that is found in trace amounts in the atmosphere. When it reacts with water, carbonic acid is formed.

One of the properties of an acid is that it has the ability to turn blue litmus paper to red.

When Carbondioxide is used as a reactant, the phenol red-containing solution will shift toward yellow because the pH of the solution is less than 7 and turns blue as carbon dioxide is consumed and the pH of the solution rises to 7 or greater.

Note that acidity is pH of 0- 6 and basic solutions are from 8 - 14 in a pH scale.

Therefore, the colour of the phenol red-containing solution would shift toward yellow.

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Heptane is limiting while oxygen is in excess. The mass of carbon dioxide produced would be 9,223.62 grams, while excess oxygen would measure 14,461.12 grams

From the equation of the reaction:

C7H16 + 11O2 --> 7CO2 + 8H2O

Mole ratio of C7H16 to O2 = 1:11

Mole of 3000 g heptane = 3000/100.21

                                           = 29.94 moles

Mole of 25000 g O2 = 25000/32

                                    = 781.25 moles

Thus, O2 is in excess and heptane is limiting.

Mole ratio of heptane and CO2 = 1:7

equivalent mole of CO2 = 29.94 x 7 = 209.58 moles

Mass of 209.58 moles CO2 = 209.58 x 44.01

                                               = 9223.62 grams

Excess mole of O2 = 781.25 - (29.94x11)

                                = 781.25 - 329.34 = 451.91 moles

Mass of 451.91 moles of O2 = 451.91 x 32

                                              = 14,461.12 grams excess oxygen.

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The melting point of the solid is that on the graph where the temperature remains constant until all the solid has melted while the boiling point is that point on the graph where the temperature does not increase until all the liquid has turned to vapor.

The temperature-time graph of the heating of a solid provides information about the melting point of that solid.

The temperature of the solid increases with time as the solid is heated.

However, at the melting point of the solid, the temperature remains constant until all the solid has melted.

This is seen as straight horizontal line on the graph.

On continued heating of the liquid, the temperature increases until a certain point is reached where the temperature does not increase until all the liquid has turned to vapor.

This is the boiling point of the liquid.

Therefore, the melting point of the solid is that on the graph where the temperature remains constant until all the solid has melted while the boiling point is that point on the graph where the temperature does not increase until all the liquid has turned to vapor.

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Answer:

Which number on the graph represents a solid?

1

Which number on the graph represents the phase change melting?

2

Which number on the graph represents the phase change boiling?

4

Explanation

Answer: peptide

The type of bond that links the amino group of one amino acid to the acid group of another is a(n) peptide bond.