Rounding to significant figures?
I'm not sure about how many significant figures the result should be rounded
(7.14 e4) + (2.8 e2) = 7.1689 e4
This shoul be rounded to 7.17 ? 7.169 ? Not rounding?
Or any other option?

Answer:

1.285 x 10²³ molecules CH₄

Explanation:

To find the amount of molecules in the sample, you need to (1) convert grams to moles (using the molar mass of CH₄) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs like the given value (3.423 = 4 sig figs).

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

 3.423 g CH₄               1 mole                  6.022 x 10²³ molecules
-----------------------  x  -------------------  x  -------------------------------------------  =
                                   16.043 g                            1 mole

=  1.285 x 10²³ molecules CH₄

Answer:where is the image

Explanation:

Answer:

B.

a selectively permeable membrane

Explanation:

Answer:

heat energy :D

Explanation:

The amount of water that will be produced is 50.36 grams

The metabolism of glucose is represented by the following equation:

\(C_6H_1_2O_6(s)+6O_2(g)--- > 6CO_2(g)+6H_2O(g)\)

The mole ratio of glucose metabolized to the water produced is 1:6.

Mole of 84.0 g glucose = 84/180.156 = 0.4662 moles

Equivalent mole of water = 0.4662 x 6 = 2.7975 moles

Mass of 2.7975 moles water = 2.7975 x 18 = 50.36 grams

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Answer:

1 and 2

Explanation:

Heterogeneous mixtures are basically refers to any solution that is not uniform in composition. A typical example is a solution of water and sand.

1)

By nature, they settle out. The denser component of the solution falls down and the lighter component stays up.

2)

The proportions may vary as it is a mixture. There is no fixed ratio of solute t solvent.

3)

The solute is not evenly distributed and this is why it is referred to as a non uniform mixture.

4)

They do not necessarily contain teo solvent and two solutes.

The correct options are option 1 and option 2 only.

Answer:

A. 1 and 2

Explanation:

The ball's potential energy is transferring into kinetic energy

Brainly if correct? Thanks!

Answer:

A

Explanation:

The balls potential energy is changing to kinetic energy

Answer:

How do amoeba respire.

Define Diffusion.

Answers:

1. Chemistry

2. Cold

3. Heat

4. Protons and neutrons

5. Positive

6. Neutral

7. True

8. Nucleus

9. Protons

10. Nobel gasses

11. Dmitri Mendeleev

12. the bottom of the square

13. True

14. Helium

The actual yield of the reaction is 4.0 g, given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.

The percent yield of a reaction is the amount of actual product obtained from a reaction taken as a ratio of the expected amount of product expressed in percentage.

Given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.

Actual yield = 80% × 5.0 = 4.0 g

Therefore, the actual yield of the reaction is 4.0 g.

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The order of the graphs that shows the movement of the object is; B  C E A D.

We know that energy has to do with the ability to do work. In this case, we can see that the object has been dropped from a height and we must have in mind the principle of the conservation of mechanical energy. In this principle, it has been stated that energy can neither be created nor destroyed but can be converted from one form to another.

As the object is falling, there are three main kinds of energy that would come into play and these are; mechanical energy, kinetic energy and potential energy.

The kinetic energy is the energy that is in motion while the kinetic energy has to do with the energy that is at a point. Looking at the graph, we know that the amount of the thermal energy would increase the farther the object falls to the ground. Let the letters be shown as A B C D E standing for each of the graphs.

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Answer:

a

Explanation:

neutalize acidity level

In the simile "Ben swallowed the sandwiches like a snake," the two things being compared are Ben (the subject of the sentence) and a snake.

The important qualities of a snake in this metaphor are its swallowing behavior and the speed at which it devours its prey.

A metaphor is a figure of speech that makes a comparison between two unrelated things, objects, or concepts, highlighting a similarity between them. Unlike similes, which use words such as "like" or "as" to make a direct comparison, metaphors state that one thing is another.

Snakes are known for their ability to consume their prey whole and quickly, using their flexible jaws and swallowing mechanism.

Therefore, the important quality of the snake in the metaphor is swallowing.

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Complete question:

Answer the questions about this simile: "Ben swallowed the sandwiches like a snake."

What two things are being compared?

What are the important qualities of a snake in this metaphor?

Answer:

The answer to your question is ⇔ anaphase

So it would be anaphase is the phase where the chromosones pull apart.

Explanation:

The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle.

I hope this helps and have a wonderful day!

Answer:

Explanation:

Determine the treatments you’ll be using on your eggs, and prepare the substances you’ll need. You can make salt-water solutions by dissolving different amounts of table salt in containers of water (e.g. 100g, 200g, 300g of salt (NaCl) per liter). You can make solutions of food coloring by adding a few drops of each color into containers of  

The Eggsperiment with Vinegar solution. The first experiment conducted was the egg placed in vinegar solution which allowed the egg to become soft and bouncy . Vinegar is a weak acid which is 5% acetic acid in water (meaning vinegar is largely just water). The egg has a shell that is made up of calcium carbonate   an air cell forms at the large end of the egg. While the embryo is growing, the shell membranes surround and contain the white or albumen of the egg. The albumen provides the liquid medium in which the embryo develops, and it also contains a large amount of the protein necessary for proper development. I hope this was hopeful

Answer:

D) Repeating units.

Explanation:

Polymers are large macromolecules which are made up of many repeating structural units called monomers :)

Answer:

the answer is correct part another is a part

Explanation:

c part

Answer:

The pH of the solution is 1.60.

Explanation:

1st) It is necessary to write and balance the chemical reaction:

Now we can see that 1 mole of NaOH reacts with 1 mole of HCl.

2nd) We have to calculate the moles contained in 15mL of 0.10M NaOH solution and the moles contained in 25mL of 0.10M HCl solution:

• Moles contained in NaOH solution:

• Moles contained in HCl solution:

Now we know that there are 1.5x10^-3 moles of NaOH and 2.5x10^-3 moles of HCl.

3rd) According to the stoichiometry of the reaction, 1 mole of NaOH reacts with 1 mole of HCl, so in this case, 1.5x10^-3 moles of NaOH will react with 1.5x10^-3 moles of HCl, because NaOH will be the limiting reactant and HCl will be the excess reactant.

So, now we have to calculate the excess of HCl:

2.5x10^-3moles - 1.5x10^-3moles = 1x10^-3moles

Now we know that there are 1x10^-3 moles of HCl left.

4th) Excess HCl will remain dissociated into H+ and Cl-, according to the following equation:

That means that for every mole of HCl, 1H+ dissociates. So, in this case, there are 1x10^-3 moles of H+.

Remember that these moles are contained in 40mL, so the molarity of H+ is 0.025M:

5th) Finally, we can calculate the pH of the solution, by replacing the H+ concentration in the pH formula:

So, the pH of the solution is 1.60.

Answer:

C

Explanation:

I had this question and C is the right answer

One idea that Dalton taught about atoms was that all atoms of one type were identical in mass and properties.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Meters, kilograms, kelvin, candela, mole, ampere, seconds.

Explanation:

These are the seven different types of measurements in chemistry. Hope it helps!

Answer:

D

Explanation:

When you first put it in the pot he tastes fine because you didn't let it sit for a bit but by letting it sit the salt has had time to evaporate.

The process that makes the soup so salty is the evaporation of water which makes the concentration of salt high. Thus, the correct option for this question is D.

Evaporation may be defined as a type of process through which the amount of liquid gets transformed into the gaseous phase due to extreme heat or high temperature. It is a type of vaporization that alters the surface of a liquid into the vapor phase.

According to the question, Luis added the amount of salt in the recipe and tasted it, it is fine and accurate. Then, he let the chicken soup simmer for two hours to blend the flavors, at that time he found that the soup was too salty.

Therefore, some water evaporated and concentrated the salt is the best statement that illustrates a valid and accurate reason behind the high concentration of salt. Thus, the correct option for this question is D.

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Answer:

it would be dermatology

Explanation:

the first two dont make sense, and a dermatologist is the doctors themselves, so therefore dermatology is the study of it

The SI unit to the quantity it measures are:

Mass: The mass of an object is a measure of its amount of matter. The SI unit of mass is the kilogram (kg) or gram (g).

Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. The SI unit of temperature is the kelvin (K).

Time: Time is a measure of the interval between two events. The SI unit of time is the second (s).

Electric current: Electric current is a measure of the flow of electric charge. The SI unit of electric current is the ampere (A).

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Complete question:

Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.

Match each SI unit to the quantity it measures.

The balanced chemical equations of the reactions are given below:

1. Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

2. 2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

A balanced chemical equation is an equation in which the number of moles of atoms of elements in a given reaction is equal to the sum of the number of moles of atoms of each element that is produced.

A balanced chemical equation is in accordance with the law of conservation of mass which states that matter can neither be created nor destroyed.

When balancing chemical equations, numerical coefficients are added in front of moles of atoms of an element or moles of a given compound taking part in the reaction.

The balanced chemical equation of the reaction of magnesium and water as well as the reaction of lithium and water is given below:

Magnesium and water:

Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

Lithium and water:

2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

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Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

metallic bonds are defined as those in which metals share valence electrons for example when sodium metallically bonds with itself each atom is sharing the electrons in the third orbital with up to eight other atoms the same thing happens with magnetism or other metals metallically bond to themselves.

Below contains the complete lab report on electromagnetic spectrum

Name: [Your Name]

Title: Electromagnetic Spectrum Lab Report

Instructor: [Instructor's Name]

Objectives:

The purpose of this lab is to analyze the elemental composition of different astronomical bodies using a virtual spectrometer and understand the importance of the electromagnetic spectrum in astronomical research.

Hypothesis:

I predict that the moons and planets will have varying compositions of elements, with hydrogen and helium being more common in gaseous bodies and heavier elements like carbon and nitrogen more common in rocky bodies.

Dependent variable: Presence of elements in astronomical bodies

Independent variable: Astronomical bodies (Moon One, Moon Two, Planet One, Planet Two)

Data:

[Please input your data for each object as per your virtual lab results]

Conclusion:

In this lab, I investigated the elemental composition of four different astronomical bodies using a virtual spectrometer and observed the presence or absence of various elements.

It is essential to use many types of equipment when studying space because different instruments can detect and analyze different aspects of the electromagnetic spectrum, providing a comprehensive understanding of the universe.

To make these moons and planets similar to Earth, oxygen would need to be present as it is a vital component of the carbon cycle and essential for life as we know it.

The electromagnetic spectrum helps us find out the makeup of stars by analyzing the emitted light, which contains information about the elements and their abundance within the star.

Determining the elements that a planet or moon is made up of helps us understand their formation, potential for life, and possible resources for future exploration or colonization.

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Answer:

\(V=0.200L\)

Explanation:

Hello,

In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:

\(V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L\)

Best regards.

Answer:

Carbon is stored on our planet in the following major sinks (1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere; (3) as organic matter in soils; (4) in the lithosphere as fossil fuels and sedimentary rock deposits such as limestone, dolomite