Which of the following solutions would have the lowest freezing point?








A.

1.0 M NaCl

B.

3.0 M NaCl

C.

2.0 M NaCl

D.

0.5 M NaCl

"Deer graze through the grassland". (3)

The sun emits solar rays that reach earth

A soil horizon is a layer parallel to the soil surface, whose physical, chemical and biological characteristics differ from the layers above and beneath. Horizons are defined in many cases by obvious physical features, mainly colour and texture.

The three correct responses are A. Low consumption rate, D.  Advanced methods of sanitation, and E. Lack of access to vaccines.

A. This option is correct because developing countries often have lower levels of consumption compared to developed countries due to factors such as lower income levels and limited access to resources and technology.

D. This option is correct because developing countries typically have less advanced sanitation infrastructure compared to developed countries, which can lead to issues such as inadequate sewage treatment and poor hygiene practices.

E. This option is correct because developing countries often struggle to provide widespread access to vaccines due to factors such as limited healthcare infrastructure, financial constraints, and logistical challenges.

Why other options are incorrect

Option B (Wastewater treatment systems) could also be relevant, but it's not as universally characteristic of developing countries as the other options. While some developing countries may lack adequate wastewater treatment systems, others may have made significant progress in this area.

Option C (Education about healthy lifestyles) is less indicative of a developing country because education about healthy lifestyles can exist in both developed and developing countries, although the extent and effectiveness of such education may vary.

The complete question is

Which of these terms best describes a developing country select the three correct responses?

A. Low consumption rate

B. Wastewater treatment systems

C. Education about healthy lifestyles

D. Advanced methods of sanitation

E. Lack of access to vaccines

Explanation:

When pH of the solution is 11.

[tex]pH=-\log[H^+][/tex]

[tex]11=-\log[H^+][/tex]

[tex][H^+]=1\times 10^{-11} M[/tex]..(1)

At pH = 11, the concentration of [tex]H^+[/tex] ions is [tex]1\times 10^{-11} M[/tex].

When the pH of the solution is 6.

[tex]pH=-\log[H^+]'[/tex]

[tex]6=-\log[H^+]'[/tex]

[tex][H^+]'=1\times 10^{-6} M[/tex]..(2)

At pH = 6, the concentration of [tex]H^+[/tex] ions is [tex]1\times 10^{-6} M[/tex].

On dividing (1) by (2).

[tex]\frac{[H^+]}{[H^+]'}=\frac{1\times 10^{-11} M}{1\times 10^{-6}}=1\times 10^{-5} [/tex]

The ratio of hydrogen ions in solution of pH equal to 11 to the solution of pH equal to 6 is [tex] 1\times 10^{-5}[/tex].

Difference between the [tex]H^+[/tex] ions at both pH:

[tex]1\times 10^{-6} M-1\times 10^{-11} M=9.99\time 10^{-7} M[/tex]

This means that Hydrogen ions in a solution at pH = 7 has [tex]9.99\time 10^{-7} M[/tex] ions fewer than in a solution at a pH = 6

Answer:

0.00000000001

0.000001

100,000

Explanation:

The answer is having hooved feet.

Make milk is maybe h im ont know sir

the primary consumer in those photos would be C

Answer:

c

Explanation:

a is not a primary consumer

b is also not primary consumer

c is a primary consumer and,

d is not so,

c is a primary consumer

hope this helps!

Explanation:

The Law of Conservation of Mass is demonstrated in photosynthesis and cellular respiration as no matter is created or destroyed during these processes, maintaining a consistent atomic mass throughout.

In photosynthesis and cellular respiration, the Law of Conservation of Mass is upheld as no matter is created or destroyed, maintaining consistent atomic mass throughout these chemical reactions. For photosynthesis, for example, six carbon dioxide molecules combine with six water molecules to produce one glucose molecule and six oxygen molecules. Similarly, in cellular respiration, glucose is broken down into carbon dioxide and water, returning these molecules to the environment. Thus, the number of atoms of each element in the reactants equals the number of atoms in the products, supporting the Law of Conservation of Mass.

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mass - hope this helps!!

The answer is Mass☺️.

71% of the earth is water and the 29% is continents and islands.

Mg^2+ + 2Cl^- -> MgCl2

The net ionic equation for the reaction of magnesium hydroxide, Mg(OH)2, and hydrochloric acid, HCl, is: Mg(OH)2(s) + 2H+(aq) → Mg2+(aq) + 2H2O(l). It shows the chemical species directly involved in the reaction, excluding spectator ions.

The net ionic equation for the reaction of magnesium hydroxide and hydrochloric acid is slightly different to total ionic equations, as it eliminates those ions which do not partake in the reaction - these are known as the 'spectator ions'. The reaction of magnesium hydroxide, Mg(OH)2 and hydrochloric acid, HCl can be outlined as follows:

In the net ionic equation, the spectator ion Cl- is removed. Net ionic equations therefore illustrate only the chemical species that are directly involved in the reaction process itself.

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Answer:

6.0 grams because just because it mixes and you cant see the baking soda the 1.0 sample is still mixied with the 5.0 so it adds up to 6.0 grams

Explanation:

Based on the law of conservation of mass, the mass of the bag's contents after the reaction should measure 6.0 grams, which is the initial total mass of the baking soda and the vinegar.

The subject of this question is based on the law of conservation of mass, which states that matter can neither be created nor destroyed. Thus, in a sealed system like the plastic bag Jeffery is using, the total mass before the chemical reaction (the mass of the baking soda plus the vinegar) should be the same as the total mass after the reaction. Jeffery started with a 1.0-gram sample of baking soda and a 5.0-gram sample of vinegar, so the total mass was 6.0 grams. Therefore, the mass of the bag's contents after the reaction should also measure 6.0 grams.

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The product of molarity and volume of any substance at a fixed temperature is constant. Therefore comparing two portions of different molarity, we can say that, M₁V₁=M₂V₂

M represents the molarity, V represents volume of the solution.

M₁ in the question is 8.8M

M₂ is 2.2M

V₁=?

V₂= 175

therefore,

8.8ₓV₁= 2.2ₓ175ml

V₁=(2.2ₓ175ml)/8.8

=43.75 ml

You need 43.75 mL of an 8.8M CaBr2 solution to prepare 175 mL of a 2.2M solution. This is achieved using the molarity formula, M1V1 = M2V2, which helps us to relate the initial and final concentrations and volumes of the solution.

To solve this problem, we need to use the concept of molarity (M), which is a measure of the concentration of a solute in a solution. The formula for molarity is M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.

In this case, we want to find V1, so we rearrange the formula to: V1 = (M2V2) / M1

Substituting the given values, we get: V1 = (2.2M * 175 mL) / 8.8M = 43.75 mL.

Therefore, you would need 43.75 milliliters of an 8.8M CaBr2 solution to prepare 175 mL of a 2.2M solution.

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Answer: The correct answer is "Mechanical waves can apply pressure to and push on objects in their path".

Explanation:

Mechanical wave is wave in which there is an oscillation of the wave. The energy is transferred through a medium. Mechanical waves can apply pressure to and push on their path. Only the energy is transferred not the matter.

Mechanical waves are of three types: Transverse wave, Longitudinal wave and Surface wave. The examples of the mechanical wave are sound wave and water wave.

Sound is a pressure disturbance which travels through a medium. It consists of compression and rarefaction.

The mechanical waves need a medium for their propagation. They travel faster in denser medium.

Therefore, the correct option is (B).

Answer:

Mechanical waves can apply pressure to and push on objects in their path

Explanation:

Question : Where does crude oil come from?

So firstly Crude oil is a fossil fuel and,is know and called implies, Over time the fossils the remains of vegetation and various organisms, and bacteria and algae, are covered by an increasing amount of soil before they are converted through heat and pressure into matter composed largely of hydrocarbons.

Hopefully that helps you ! have a good day !

//hey again//

The article is correct because although vacuoles are found in both plant and animal cells, they are larger in plant cells than in animal cells.

hope this helps uwu

~i love your profile picture~

Vacuoles are found in both plant and animal cells, but they are larger in plant cells than in animal cells.

The article is correct because although vacuoles are found in both plant and animal cells, they are larger in plant cells than in animal cells.

Plant cells have a large central vacuole that holds a mixture of water, nutrients, and wastes. A plant cell's vacuole can make up 90% of the cell's volume. In animal cells, vacuoles are much smaller.

In addition to containing most of the organelles found in animal cells, plant cells also have a cell wall, a large central vacuole, and plastids. These three features are not found in animal cells.

I believe it is D because being resistant to diseases could have helped not spread diseases among one another and the babies would have had the same trait to keep them alive.

I hope this has helped

Body resistant to diseased caused by mosquito bites.

TOOK FLVS TEST AND GOT IT RIGHT

A .gamma

Because composed of photons, which have neither mass nor electric charge and, as a result, penetrates much further through matter than either alpha or beta radiation.

A type of radiation that has neither mass nor charge is called: A) gamma.

In Science, there are four (4) main types of radiation and these include the following:

Gamma radiation can be defined as a form of electromagnetic radiation that is produced from the radioactive decay (disintegration) of the unstable nucleus of an atom.

Unlike alpha and beta particles, gamma radiation is a weightless packet of energy because it neither has mass nor charge.

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Answer:

Scientists observe the layers for evidence of similar rock types and fossil formations to determine the age of landforms. If they find the same fossil in two different locations, scientists may conclude that those fossils are most likely from the same time period.

Explanation:

Final answer:

Scientists use geologic time involving relative and absolute dating techniques to compare the age of fossils. Biotic components of an ecosystem are the living parts, while abiotic parts are non-living. The geologic time scale and geological principles help in understanding Earth's history and the development of life.

Explanation:

Scientists compare the age of two fossils by using geologic time, which involves both relative dating and absolute dating techniques. Relative dating places fossils and rocks in chronological order without determining their exact age. Scientists use index fossils and the principle of superposition to determine a relative age. Absolute dating, on the other hand, provides an approximate numerical age using radiometric techniques, such as measuring the decay of radioactive isotopes. However, the term "carbon dating" is somewhat of a misnomer when aging rocks and fossils, as this method is primarily used for dating items that are less than 50,000 years old, and not for older geologic materials.
In any ecosystem, the biotic components refer to the living parts, such as animals, plants, and microbes, while abiotic components include non-living factors like water, rocks, and climate. The interaction between these parts is crucial to the functioning of an ecosystem.

The substances that influence the rate of reaction are usually one or more of the reactants, but can occasionally include products. ... The rate law is experimentally determined and can be used to predict the relationship between the rate of a reaction and the concentrations of reactants.

The rate law uses the molar concentrations of reactants to determine the reaction rate.

A catalyst is a substance that allows the chemical reaction to occur at a faster rate or under different conditions (e.g. at a lower temperature) without being affected by the reaction.

The substances that influence the rate of reaction are usually one or more of the reactants, but can occasionally include products.

The rate law is experimentally determined and can be used to predict the relationship between the rate of a reaction and the concentrations of reactants.

The rate law uses the molar concentrations of reactants to determine the reaction rate.

Typically, increased concentrations of reactants increase the speed of the reaction, because there are more molecules colliding and reacting with each other.

Learn more about the catalyst here:

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Answer: In organisms called eukaryotes, DNA is found inside a special area of the cell called the nucleus. Because the cell is very small, and because organisms have many DNA molecules per cell, each DNA molecule must be tightly packaged. This packaged form of the DNA is called a chromosome

Explanation:

now i honestly do not know if this answer is correct, i looked all over the internet for answers and this is what i got. i hope it helps.

Answer:

34.33 %.

Explanation:

W% = [(W of solute NaF)/(W of solution)] x 100.

W of solute NaF = 65.4 g.

W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.

∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.

The percent concentration of the sodium fluoride solution is approximately [tex]\( 34.32 \% \)[/tex].

To find the percent concentration of the sodium fluoride solution, we first need to calculate the total mass of the solution, which is the sum of the mass of sodium fluoride [tex](\( \text{NaF} \))[/tex] and the mass of water [tex](\( \text{H}_2\text{O} \))[/tex].

Total mass of the solution [tex]\( = \text{mass of NaF} + \text{mass of water} \)[/tex]

Given:

Mass of sodium fluoride [tex](\( \text{NaF} \)) \( = 65.4 \) grams[/tex]

Mass of water [tex]\( = 125.1 \) grams[/tex]

[tex]Total mass of the solution \( = 65.4 \, \text{g} + 125.1 \, \text{g} = 190.5 \, \text{g} \)[/tex]

Next, to find the percent concentration of sodium fluoride in the solution, we'll use the following formula:

[tex]\[ \text{Percent concentration} = \frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 \][/tex]

where:

Mass of solute is the mass of sodium fluoride

Mass of solution is the total mass of the solution

Substituting the given values:

[tex]\[ \text{Percent concentration} = \frac{65.4 \, \text{g}}{190.5 \, \text{g}} \times 100 \][/tex]

[tex]\[ \text{Percent concentration} = \frac{65.4}{190.5} \times 100 \][/tex]

[tex]\[ \text{Percent concentration} = 0.3432 \times 100 \][/tex]

[tex]\[ \text{Percent concentration} \approx 34.32 \% \][/tex]

true on e2020**********

Answer : The correct option is (D)  "The question relies on moral or social values".

A non scientific question in biology relies on moral or social values, as these questions are subjective and cannot be empirically tested using scientific methods. A description that indicates a question is non scientific is D. The question relies on moral or social values.

A description that indicates a question is non scientific is D. The question relies on moral or social values. In the field of biology, and in science generally, scientific questions are answered using the scientific method. This involves making observations, formulating testable hypotheses, and conducting experiments. A non scientific question might involve elements such as morals, ethics, or personal opinions which cannot be tested or measured empirically. Questions about moral or social values do not fit within this framework because they are inherently subjective and are not universally observable or testable.

Answer:

Human ears can hear sound waves that vibrate in the range from about 20 times a second (a deep rumbling noise) to about 20,000 times a second (a high-pitched whistling). (Children can generally hear higher-pitched sounds than their parents, because our ability to hear high frequencies gets worse as we get older.) Speaking more scientifically, we could say that the sounds we can perceive have a frequency ranging from 20–20,000 hertz (Hz). A hertz is a measurement of how often something vibrates and 1 Hz is equal to one vibration each second. The human voice makes sounds ranging from a few hundred hertz to a few thousand hertz.

Suppose you could somehow hit a drum-skin so often that it vibrated more than 20,000 times per second. You might be able to see the skin vibrating (just), but you certainly couldn't hear it. No matter how hard you hit the drum, you wouldn't hear a sound. The drum would still be transmitting sound waves, but your ears wouldn't be able to recognize them. Bats, dogs, dolphins, and moths might well hear them, however. Sounds this like, with frequencies beyond the range of human hearing, are examples of ultrasound.

Infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear—i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.

Well, for one thing, they ensure that a scientist can't claim a certain result, which might be biased and thus inaccurate, because he or she is being paid by, say, big business interests. For another, they ensure that medicines or treatments can't be made available to the public without thorough testing, replication, and peer review.

Explanation:

ethical guidelines are made to be implemented together to make any type of ethical judgment.

ethical guidelines make science safer because

Answer:

A) The independent variable should be labeled on the X-axis.

Explanation:

• Dependent variables: properties that the researcher or observer can not directly control. These properties usually change as an effect of the change in other property.

• Independent variables: properties whose value can be picked or determined by the researcher to see if they are the cause of a change in the dependent variable.

If you are tracking the growth of a tree over the last year, you would like to know the influence of time on the growth of the tree. You probably have selected some values of time to measure the growth of the tree, it could be every fifteen days, every month or every quarter. As you can influence or pick the value of the time, it is your independent variable, and you can analyze the influence of the chance of time on the tree growth, which is your dependent variable.

Finally, we can say that the time should be labeled on the x-axis, since it is the independent variable.

In a line graph, the independent variable is labeled on the x-axis. This is the variable you control or change in the experiment. Proper labeling of a graph helps clarify the data representation.

When you are creating a line graph to track the growth of a tree over the last year, the most important thing is to label the independent variable on the x-axis.

The independent variable is the one that you have control over in your experiment or the one that you choose to change to see if it has an effect on another variable. In this case, the independent variable is time, which you would represent on the x-axis of the graph. The dependent variable, or the one you measure to see if it changes when the independent variable changes, would be the growth of the tree, and this would be represented on the y-axis.

Properly labeling your graph, including both axes and the title, helps you and others understand what the data is showing more clearly.

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3.4 kJ

Taking the mass of water as 10.0 g

Moles of water = Mass /molar mass

Moles of water in 10.0 g;

= 10g H2O x 1mol/18g

=0.56mol

But, 1 mole of water = 6.01 kJ

Hence;

6.01kJ/1mol H2O= x kJ/.56mol,

               x = 3.4kJ

Final answer:

The heat required to melt a 10-gram popsicle at 0°C is approximately 3.34 kJ, calculated using the molar heat of fusion for water and the molar mass of water.

Explanation:

To calculate the number of kilojoules of heat required to melt a 10-gram popsicle at 0°C, we will use the heat of fusion of water. The heat of fusion is the amount of energy needed to change 1 mole of a substance from the solid phase to the liquid phase without changing its temperature.

First, we must find the number of moles in 10 grams of water. The molar mass of water (H₂O) is approximately 18.015 g/mol, therefore:

Moles of water = mass (g) / molar mass (g/mol) = 10 g / 18.015 g/mol = 0.555 moles (approximately)

Next, we use the molar heat of fusion for water, which is 6.01 kJ/mol. The energy (Q) required to melt the ice in kilojoules is:

Q = moles × heat of fusion = 0.555 moles × 6.01 kJ/mol = 3.33555 kJ

Therefore, the heat required to melt a 10-gram popsicle at 0°C is approximately 3.34 kJ.

2. It can travel in a vacuum.

This is true!

Empirical formula is nh3

The question seems to involve a composition error, resembling a compound formation reaction. The correct empirical formula for N3H9 after simplification would be NH3, which is the formula for ammonia. The empirical formula represents the simplest ratio of elements in a compound.

The question refers to finding the empirical formula of a compound with an initial composition of N3H9. The empirical formula represents the simplest whole-number ratio of atoms in a compound. However, the given composition does not match any common or simple empirical formula, and seems like a simplification error occurred.

We can compare the process to another compound, naphthalene, where a 1.25:1 ratio of moles of carbon to hydrogen leads to an empirical formula of C5H4 once the subscripts are multiplied by 4 to achieve whole numbers. For the compound ammonia (NH3), the balanced equation N2 (g) + 3H2 (g) → 2NH3 shows the correct stoichiometry of nitrogen to hydrogen.

If the composition N3H9 were correct, dividing the subscripts by the greatest common divisor, which is 3, would yield NH3, the formula for ammonia. Thus, the empirical formula for this case would be NH3, and the equation representing the combination process would be: N2 + 3H2 → 2NH3. The empirical formula mass for NH3 would be the sum of the atomic masses of nitrogen and hydrogen.

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