Why is it important for scientists to monitor meteors in the sky?

Answer:

1

Explanation:

........................

Answer:

If capital R is round, than the RR and Rr will mean round, and the two rr's are wrinkled. that means the answer to both is 50%

Explanation:

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Answer:

A. 30cm³

Explanation:

Based on the chemical reaction:

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂

To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:

Moles CaCO₃ -Molar mass: 100.09g/mol-

1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles

Moles HCl:

50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles

For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:

2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.

The moles produced of CO₂ are:

2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂

Using PV = nRT

Where P is pressure = 1atm assuming STP

V volume in L

n moles = 1.25x10⁻³ moles CO₂

R gas constant = 0.082atmL/molK

T = 273.15K at STP

V = nRT / P

1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V

0.028L = V

28cm³ = V

As 28cm³ ≈ 30cm³

Right option is:

Answer:

If kept in Celsius: 0.15 L

If kept in Kelvin: 0.89 L = 0.90 L

Explanation:

This formula can be remembered by just remembering the ideal gas law formula, PV=nRT

P= pressure, V= volume, n= moles, R=constant, and T= temperature.

Let's take away what is constant, particles/moles, pressure, and R.

so what we have is P=T -> [tex]\frac{V}{T}[/tex] =x, we want to know how it changes though so we can say that [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]. Where P1 and T1 are for the air in your lungs that you expel, the P2 and T2 is the air now in your surroundings after you exhale.

Let's plug it in and solve for V2.

[tex]\frac{1 L}{37 C} = \frac{V2}{5.6}[/tex]

[tex]\frac{(1 L x 5.6 C)}{37 C} =[/tex] V2

0.15 L = V2

Answer:

I think its 3.6 to the right

Explanation:

I apologize if im wrong

Answer: The pH of the substance is 8.25. The solution is basic.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydronium ion concentration. The acids have pH ranging from 1 to 6.9 , salts have pH of 7 and bases have pH ranging from 7.1 to 14.

[tex]pH=-\log [H_3O^+][/tex]  

Putting in the values:

[tex]pH=-\log[5.6\times 10^{-9}][/tex]

[tex]pH=8.25[/tex]

Thus as pH is more than 7, the solution is basic.

The pH of the substance is 8.25. The solution is basic.

Answer:

the correct answer is D

Explanation:

Basically, melting ice is an endothermic reaction because the ice absorbs (heat) energy, which causes a change to occur.

Answer:

2c11h21

Explanation:

Answer:

chemical bonds

Explanation:

The atoms in chemical compounds are held together by attractive electrostatic interactions known as chemical bonds. Ionic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero. The ions are held together in a regular spatial arrangement by electrostatic forces.

Answer:

GIVEN IT'S A MULTI CHOICE QUESTION:

1. False

2. True

3. False

4. True

IF ITS NOT

2

Explanation:

We haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.

Cloning is a genetic technique that can be used to reproduce genetically identical organisms in a laboratory.

In conclusion, we haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.

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Answer:

30.1 g NaCl

Explanation:

Your first conversion is converting grams NaOH to moles of NaOH using its molar mass (39.997 g/mol). Then, use the mole ratio of 1 mol NaCl for every 1 mol NaOH to get to moles of NaCl. Then finally multiply by the molar mass of NaCl (58.44 g/mol) to get grams of NaCl.

20.6 g NaOH • (1 mol NaOH / 39.997 g NaOH) • (1 mol NaCl / 1 mol NaOH) • (58.44 g NaCl / 1 mol NaCl) = 30.1 g NaCl

Answer:

When sodium hydroxide react with sulphuric acid they form Sodium sulphate and water. The reactants is base and an acid, which leads to neutralization process and yields a salt .

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Answer:

a) 2f

B)CIO3+na

c)2NO2(g)

d)HSO3(h)

Explanation:

The sign of entropy depends on the number of gaseous substance in the system. In the first reaction, the number of gaseous particles increase in the product hence, randomness increases and thereby entropy is positive.

Entropy is a thermodynamic quantity which measures the randomness of the system. As the disorder in the system increases, the entropy increases and the entropy change is said to be positive in sign.

In the first reaction, in the product side, 2 moles of gaseous substance is formed, which increases the randomness, hence, entropy change is positive.

In the second reaction, the more ordered solid state is getting into less ordered aqueous state. Hence, S is positive.

For the third reaction, the number of moles of gas decreases from 3 to 2. Hence S is negative. For the last reaction, there is no change in number of moles or state of substance and no change in S.

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Answer:

Basically, fragrances reach other person through sense of smell. So, the strength of the fragrances depends a lot on its evaporation, which is strongly related to the boiling point. Esters with higher molecular weight do not have a strong fragrance because it has a higher boiling point.

In order to determine the objectives that you've accomplished, you should identify the steps required to test a hypothesis.

A scientific method refers to the various techniques and objectives that are adopted to observe, investigate, and study the natural world while giving explanations on the basis of the evidence, hypothesis, or factual information that are derived from a research work.

An effective and efficient way to accomplish your objectives during a research work include the following:

In conclusion, you should identify the steps required to test a hypothesis in order to determine the objectives that you've accomplished.

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Answer:

0.0922 M

Explanation:

The problem first states that the titration is made using NaOH, and later asks about the addition of KOH. I'm going to assume NaOH was used throughout the whole problem. The result does not change if it was KOH instead.

The reaction that takes place is:

First we calculate how many HClO₄ moles are there in the sample, using the given molarity and volume:

Then we calculate how many NaOH moles were added:

Now we calculate how many HClO₄ remained after the reaction:

As HClO₄ is a strong acid, 4.24 mmol HClO₄ = 4.24 mmol H⁺

Finally we calculate the molarity of H⁺, using the calculated number of moles and final volume:

Answer:

The alkaline hydrolysis of ester is known as saponification. When ester is heated with aqueous NaOH, sodium salt of acid and alcohol are formed.

The process of saponification of an ester in an alkaline solution. Alcohol and sodium salt of acid are created when the bis heated with aqueous NaOH.

Esters are converted into soap and alcohol through the process of saponification, which uses an aqueous alkali. Fatty acids, which are long-chain carboxylic acids, are the building blocks of soaps. Sodium stearate is a regular soap ingredient.

From the Latin sapo, which signifies soap, the reaction is known as a saponification. The term is derived from the fact that fats were once hydrolyzed into esters to produce soap.

Particularly in the food industry, saponification is significant because it makes it simpler to estimate the amount of free fatty acids present in a specific food product. The quantity of free fatty acid can be determined by measuring how much alkali was needed to neutralize the fat or oil.

Thus,the alkaline hydrolysis reaction of esters is called as saponification.

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Answer:

In materials science, an intrinsic property is independent of how much of a material is present and is independent of the form of the material, e.g., one large piece or a collection of small particles. Intrinsic properties are dependent mainly on the fundamental chemical composition and structure of the material.

Explanation:

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Answer:

1.022ppm is the unknown concentration of the metal

Explanation:

Based on Lambert-Beer law, the increasing in signal of a detector is directly proportional to its concentration.

The unknown concentration (X) produces a signal of 0.255

99mL * X + 1mL * 100ppm / 100mL produces a signal of 0.502

0.99X + 1ppm produce 0.502, thus, X is:

0.255 * (0.99X + 1 / 0.502) =

X = 0.503X + 0.508

0.497X = 0.508

X =

1.022ppm is the unknown concentration of the metal

Answer:

I- It says horizon so.....what....wth ._.

Explanation:

Cr2Na2O7

Sodium Dichromate

Forget about mitigating climate change. Our planet has been warming nicely for the last three hundred years or more, and is a lot more productive and comfortable to live on than it was back then. All we have to do is not stuff it up.

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Answer:

Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.

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The greatest heat capacity is possessed by iron.

The heat capacity of materials increases as the number of particles in the material or density of the material increases.

This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.

The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by  1°C.

The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.

This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.

Hence iron has the greatest heat capacity among the three elements.

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Answer:

water is an example of mixture

Answer:

Hello There!!

Explanation:

The answer is=>a. Gibbs.

hope this helps,have a great day!!

~Pinky~

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a. Gibbs