a compound contains only c, h, and n. combustion of 35.0 mg of the compound produces 53.0 mg co2 and 32.6 mg h2o. what is the empirical formula of the compound?

Answer:

B is because their not combined

Answer:

tru it's B

Explanation:

give the person above me brainliest if u want

Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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The pH of the solution after 0.028 moles of Ba(OH)2 are added to 0.62L of the buffer solution containing 0.18M of base B and 0.48M of its conjugate acid BH is 8.89. To calculate the pH, you need to use the Henderson-Hasselbalch equation: pH = pKa + log ([B]/[BH]).

First, calculate the total moles of B and BH by adding 0.028 moles of Ba(OH)2 to 0.62L of the original buffer solution, then use the equation to calculate the pH. Here are the steps:

1. Calculate the total moles of B and BH after 0.028 moles of Ba(OH)2 are added.

Total moles of B = 0.18 + (0.028 / 2) = 0.194

Total moles of BH = 0.48 + (0.028 / 2) = 0.508

2. Calculate the pH using the Henderson-Hasselbalch equation.

pH = pKa + log ([B]/[BH])

pH = 8.91 + log (0.194/0.508)

pH = 8.89

Therefore, the pH of the solution after 0.028 moles of Ba(OH)

are added to 0.62L of the buffer solution is 8.89.

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Answer:

131.293 u

Explanation:

Solid cu has an 8.96 g/cm3 density. Per cubic centimeter (cm3) of cu, there are 3.61*10⁻⁸ atoms.

Molar mass of Cu = 63.546 gm/mol

according to avogadro's law, 1 mol of a substance contains 6.022*10²³ atom

thus, 63.546 gm Cu contains 6.022*10²³ atom

density of Cu = 8.96g/cm³ that mean 1 cm3 contain 8.96 gm Cu

we have to calculate 63.546 gm Cu containing 6.022*10²³ atom then 8.96 gm Cu contains how many atom calculations are given as below.

63.546/8.96 =  6.022*10²³?

? = 6.022*10²³*8.96/63.546

=8.494*10²² atom

1 cubic centimeter of Cu contains 8.494*10²² atom

Cu adopts FCC unit cell so contains 4 atoms in each unit cell

one cubic centimeter contains 8.494*10²² atom

therefore one cubic centimeter contains 8.494*10²²/4 =2.1235*10²² unit cell

2.1235*10²²unit cell have volume 1 cm³then 1 unit cell have volume 1/2.1235*10²² =4.72*10⁻²³ cm3

Edge = (4.72*10⁻²³ cm³)1/3 =3.61*10⁻⁸cm

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Answer:

I'd wanna see whats in the nuclues

Explanation:

Because its interesting to know what and how it really looks like up close. I also wanna know if an electron really has a light mass

The correct answer to this question is (B) It would increase. The average kinetic energy of the molecules of a gas sample is directly proportional to the temperature of the sample.  

This is known as the kinetic theory of gases. According to this theory, the molecules of a gas are in constant motion, and the kinetic energy of each molecule is directly proportional to its temperature.
When the temperature of a gas sample increases, the kinetic energy of the molecules also increases. This means that the molecules move faster and collide more frequently with each other and with the walls of the container. This leads to an increase in the pressure and volume of the gas. Therefore, if the temperature of the gas sample increases from 20°C to 40°C, the average kinetic energy of the molecules would increase. This increase in kinetic energy would result in an increase in the pressure and volume of the gas. It is important to note that this increase in kinetic energy is proportional to the absolute temperature of the sample, which is measured in kelvin (K). The Kelvin scale is based on the absolute zero temperature, which is -273.15°C. Therefore, the temperature of the gas sample would increase from 293.15 K to 313.15 K, resulting in an increase in the average kinetic energy of the molecules. option B.

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Answer:

40 Newtons

Explanation:

4.218 is not even close to 40 N.

The 40 N force must be the larger force because 40 has a larger magnitude than the 4.218.

The term magnitude has to do with how large the force is. The larger the force the larger the value that is mentioned.

This implies that the 40 N force must be the larger force because 40 has a larger magnitude than the 4.218.

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Answer:

Sodium carbonate + Nitric acid → sodium nitrate + water + carbon dioxide.

Explanation:

Answer:

Sodium carbonate + Nitric acid → sodium nitrate + water + carbon dioxide.

PbCl₂ among the following aqueous solutions will a decrease of pH increase the solubility.

Option B is correct.

The solubility of both gases and solids is influenced by temperature. With solids, by and large the solvency increments with expanding temperature. The solubility of gases tends to decrease with temperature. The solubility of gases is all that is affected by pressure.

The solubility of ionic compounds with basic anions increases with decreasing solution pH. For ionic mixtures containing anions of irrelevant basicity (like the form bases major areas of strength for of), dissolvability is unaffected by changes in pH.

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Answer:

I believe wood wood melt it faster. Why, because of how compact it is. It would be warmer. Metal would be a cooler temperature.

Explanation:

Answer:

A

Explanation:

The energy is used for muscle contraction, nerve impulse transmission and protein synthesis.

Phosphate molecules are negatively charged. when they are arranges in a certain way they repel one another. This repulsion makes the ADP and ATP molecules. Then the energy stored in the covalent bond is released. Energy is also released when a phosphate is removed from ADP. This energy can be transforms to other molecules to form a reaction in the cell. ATP is the primary energy source. This is used in muscle contraction ,nerve impulse transmission, and also used in protein synthesis. It form adenosine monophosphate. energy is also used to run cells of the body.

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The source for most of the energy that causes the temperature of Miltown to be 15°C (59°F) in the spring is the sun.

The sun's energy is responsible for heating the Earth's surface, which in turn heats the surrounding air through convection. The amount of energy that reaches the Earth's surface depends on factors such as the angle of incidence and atmospheric conditions, but the sun is ultimately the primary source of energy that drives Earth's weather patterns and temperature fluctuations. Thus, the sun plays a crucial role in determining the temperature and climate of Miltown, as well as the rest of the planet.

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Answer:

the answer is the second one.

Answer:

Temperature is a measure of the average kinetic energy of the particles in a substance.

The law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

In other words, as the quantity of one good increases, the individual is willing to sacrifice fewer units of the other good to obtain an additional unit of the first good. This reflects a diminishing rate of substitution between the two goods.

The reason why the law of diminishing marginal rate of substitution suggests that isoquants must be bent toward the origin is rooted in the concept of diminishing marginal utility. As more units of a particular input (e.g., labor or capital) are added while holding other inputs constant, the additional output gained from each additional unit of the input will decrease. This diminishing marginal productivity leads to a decreasing MRS.

When isoquants (which represent different combinations of inputs that produce the same level of output) are bent toward the origin, it reflects the fact that as more of one input is used, the amount of the other input that needs to be substituted decreases. This bending signifies the diminishing MRS and captures the idea that a larger quantity of one input can be substituted for a smaller quantity of the other input to maintain the same level of output.

Overall, the law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

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Answer:

carbon

Explanation:

i just googled it

Answer:

0.0074 moles

Explanation:

We'll have to use this forumla: PV = nRT

P = Pressure (0.724)

V = Volume in liters (0.25)

n = moles

R = 0.0821

T = temperature in kelvins (25 + 273 = 298)

Our equation will look like this:

(0.724)(.25) = n(0.0821)(298)

0.181 = 24.4658n

Divide both sides by 24.4658 to isolate n

0.181/24.4658 = 24.4658n/24.4658

n = 0.00739808

Answer:

done this before in my science class

Explanation:

the hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first

(sorry if that sounded confusing im tired, heres a cat)

The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.

Toothpaste is a key part of your daily oral hygiene routine. Along with your toothbrush and floss it helps to remove food debris and plaque from your teeth and gums.

Toothpastes can come in a gel, paste or powder form. While the ingredients differ slightly, all toothpastes contain the same general components.

With some help from your toothbrush, these help to remove debris and surface stains. This ingredient helps to prevent water loss, and keeps your toothpaste from drying out or getting gummy.  This is what gives your toothpaste a little bit of sweetness, and that minty fresh scent. Since these do not contain sugar, they also do not promote tooth decay.

Therefore, The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.

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Answer: Its B for the Study Island assignment

Explanation:

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Electronegativity is the property of an element to gain shared pair of electron. On going down the group of periodic table, electronegativity decreases. The reason for decreasing electronegativity is the increase in the size of the element. Since bromine is larger in size than fluorine, so bromine is less electronegative than fluorine. Bromine is less electronegative than fluorine.

Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.

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The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.

As we go down the group, the number of orbits or shell increases.

Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

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Answer:

1. A

Explanation:

1.A True we can identify solutions based on the color of the solutions. If you look at our  universal PH color chart. Red, Orange, and yellow are acids.

2. D, If you look at the pH levels. Both B and C have a pH level equal to or greater than 7. Note that any pH level 7 or higher is a basic solution.

3.A

Looking at the pH level we can see that this is an acidic solution. So, by adding more water. The acidity will lessen.

a. Decreasing alpha from 0.05 to 0.01 makes the significance level more stringent. You will be less likely to reject the null hypothesis, even when it's false. This increases the probability of a Type II error, thus potentially reducing the power of the test. The power curve will shift to the left.

b. If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

The power curve is a graph that shows the probability of rejecting the null hypothesis as a function of the true value of the mean.

In the given scenarios of this study, Reducing the significance level and reducing the sample size will shift the power curve to the left, indicating a decrease in the statistical power of the test.

The power of a statistical test is the probability that it correctly rejects the null hypothesis when the alternative hypothesis is true.

a) Reducing alpha from 0.05 to 0.01 means that we are more stringent in our assessment of whether the new treatment is effective.

This will result in a decrease in the power of the test, meaning that it is less likely that we will be able to detect a difference between the new treatment and the previous treatment.

b) If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

This is because a smaller sample size decreases the power of the test. A larger sample size provides more information and thus makes it more likely to correctly reject the null hypothesis when the alternative hypothesis is true.

Therefore, by reducing the sample size, you are decreasing the likelihood of detecting a true effect if one exists, thus reducing the power of the test.

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Agar is a complex polysaccharide derived from red algae. It is valued for its gel-forming properties and is extensively used in microbiology laboratories as a solidifying agent for culture media.

Agar has several unique properties that make it valuable in various applications, particularly in the field of microbiology. It forms a gel-like substance when dissolved in water and heated, but it remains solid even at relatively high temperatures. This property makes agar an excellent solidifying agent for culture media used to grow microorganisms in the laboratory.

Agar is widely used in microbiology laboratories for the cultivation and isolation of bacteria, fungi, and other microorganisms. It provides a solid surface for the microorganisms to grow, allowing scientists to study their morphology, behavior, and interactions. Agar plates are commonly used for bacterial culture, colony counting, and antibiotic susceptibility testing.

Beyond microbiology, agar has diverse applications in the food industry, where it is used as a thickening agent, stabilizer, or vegetarian substitute for gelatin. It is also utilized in pharmaceuticals, cosmetics, and various scientific research fields.

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Substance C is a solid solute according to the solubility curve. So option B is correct.

Solubility is the maximum solubility that a solute can   have in a 100 g solvent at a specific temperature. Solubility   curves are plots of the temperature andthe solubility value of a specific solute.

The curve of solubility is a curved line on a graph that indicates the relationship   between temperature and solubilityfor a given substance at different temperatures.

The graph of the   relationship of solubility to temperature is called the Solubility curve.

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Radiocarbon dating is used to determine the age of an object.

Radiocarbon dating is a method used to estimate the age of organic materials based on the decay of radioactive carbon-14 isotopes. This technique is widely employed in archaeology, geology, and other scientific fields. When living organisms, such as plants or animals, are alive, they maintain a ratio of carbon-14 to stable carbon-12 isotopes.

However, once they die, the carbon-14 begins to decay at a known rate. By measuring the remaining carbon-14 and comparing it to the initial ratio, scientists can calculate the time that has passed since the organism's death. This method is particularly useful for dating objects that are up to around 50,000 years old. Palynology is the study of pollen grains, taphonomy focuses on the process of decay and fossilization, and paleontology deals with the study of fossils but not specifically dating methods.

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Answer:

Aluminum carbonate | Al2(CO3)3 - PubChem

Explanation:

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