A delivery driver's car has a mass of 1500 kg and
is moving at 5 m/s.
The car is unloaded and travels at 10 m/s. If the
truck has the same momentum in each case,
what is the mass of the empty truck?
75 kg

The answer of the mathematical operation to the correct number of significant figures is 1.71x10⁻⁴

The answer of the mathematical operation to the correct number of significant figures is 7.2

The no of significant figures in the answer depends on the no of significant figures in the problem given.

It is given 1.05x10⁻³/6.135 , so the number of significant figures in 1.05x10⁻³ is 3 and in 6.135 is 4. So the answer of this operation will be rounded off to have 3 significant figures only. Since the calculated amount comes out as 0.17114x10⁻³. But it has to be rounded to 4 significant figures. So the answer will be 1.71x10⁻⁴

It is given 21-13.8 , so the number of significant figures in the operation are 2 and 3 respectively. So the calculated amount comes to be 7.2 and it already has 2 significant figures.

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Answer:

uuuhm???? sonar??? and???? idk??? gooogle it

Explanation:

I guess since it has greater number on ions it won't react as heavily as the others, I'm going based off of atoms.

The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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The potential energy (u) of a pair of hydrogen atoms separated by a large distance x is given by the equation = u(x) = -c6/x^6. The equation provided represents a simplified model of the interaction between hydrogen atoms, known as the Lennard-Jones potential.

In this equation, c6 is a positive constant that determines the strength of the interaction between the hydrogen atoms. The potential energy is inversely proportional to the sixth power of the distance between the atoms.

As the distance (x) between the hydrogen atoms increases, the potential energy decreases rapidly. This is because the negative sign indicates an attractive force between the atoms. The potential energy approaches zero as the distance between the atoms becomes very large.

Conversely, as the distance between the hydrogen atoms decreases, the potential energy becomes more negative, indicating a stronger attractive force between the atoms.

In reality, the interaction between atoms is more complex and involves other factors such as electron-electron repulsion and electron-nucleus attraction.

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The reaction between solid sodium and iron III oxide is:

2 Na(s) + Fe2O3(s) → 2 NaFeO2(s) + 1/2 O2(g).

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white metal that belongs to the alkali metal group in the periodic table. Sodium is highly reactive, particularly in the presence of water, and is never found free in nature. It was first isolated by Sir Humphry Davy in 1807 using electrolysis. Sodium is an essential element for all living organisms, and it plays a crucial role in various physiological processes, including fluid balance, nerve impulse transmission, and muscle function. Sodium is also widely used in the production of many industrial chemicals, including sodium hydroxide (caustic soda), sodium carbonate (washing soda), and sodium bicarbonate (baking soda). Sodium compounds are also used in the manufacturing of soaps, detergents, paper, and textiles. However, excessive sodium intake can lead to health problems such as high blood pressure and cardiovascular diseases.

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Answer:

0.00235

Explanation:

The zeros at the beginning aren't significant, so include those zeros in your answer. The 6 at the end in greater than 5 so that rounds the 4 to up one number (In this case, it's 5).

This gives you 0.00235

Answer:

D

Explanation:

Because 30c is kevin and add 303+30=333-30=303

The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Therefore, option B is correct.

The term temperature is refer to the degree of hotness or coldness of an object.Temperature is measured with a thermometer. Temperature is the measure of average kinetic energy of a system.

There are main three different scales are commonly used to measure temperature that are Fahrenheit (expressed as °F), Celsius (°C), and Kelvin (K).

The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Because at 30°c in Kelvin = 273 + 30

= 303 kelvin

Thus, option B is correct.

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Answer:

1:loses or gains energy

The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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B to C:-

E to D:-

Answer:

The correct answer on edge for 2021 is C. None.

Explanation:

We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.

The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.

Thus, option C is correct.

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In the provided activity, you are observing the effects of different solutions on the shape of red blood cells. Let's go through each effect and explanation:

Effect of isotonic solution on cell shape:

When an isotonic solution, such as 0.9% NaCl or 5% dextrose, is added to the edge of the coverslip, the red blood cells will not change their shape significantly. An isotonic solution has the same osmolality as the cell, meaning the concentration of solutes in the solution is similar to that inside the cell. As a result, there is no net movement of water across the cell membrane, and the cells maintain their original shape.

Effect of hypertonic solution on cell shape:

When a hypertonic solution, such as 25% NaCl, is added to the edge of the coverslip, the red blood cells will undergo a change in shape. A hypertonic solution has a higher osmolality than the cell, meaning the concentration of solutes in the solution is higher than that inside the cell. In this case, water will move out of the red blood cells through osmosis, from an area of lower osmolality (inside the cells) to an area of higher osmolality (the hypertonic solution). The loss of water causes the cells to shrink and become crenated or wrinkled.

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You can fill in the table for other elements and their respective isotopes by determining the appropriate number of protons, neutrons, and electrons based on the given isotope mass number and atomic number.

To accurately fill in the table with the correct number of subatomic particles for the elements given the isotope mass number, we need to consider the composition of atoms and their respective subatomic particles. Atoms are composed of protons, neutrons, and electrons.

The number of protons in an atom is equivalent to its atomic number, which uniquely identifies the element. The number of neutrons can be determined by subtracting the atomic number from the isotope mass number. Electrons in a neutral atom are equal to the number of protons.

Let's take an example using the isotope mass number:

Isotope: Carbon-14 (mass number = 14)

Element: Carbon (atomic number = 6)Based on the atomic number and isotope mass number, we can determine the number of subatomic particles as follows:

Protons: 6 (same as the atomic number)

Neutrons: 14 - 6 = 8

Electrons: 6 (same as the number of protons in a neutral atom)

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Scatterplot: To visualize the relationship between these two variables, create a scatterplot of the number of beers versus blood alcohol content (BAC).

The next step would be to find the equation of the least-squares regression line, which would give the best prediction of BAC based on the number of beers. A regression analysis software or a statistical formula can be used to calculate the equation.

R-squared is the coefficient of determination, and it measures the strength of the linear relationship between two variables. A strong linear relationship is indicated by a high R-squared value, whereas a weak relationship is indicated by a low R-squared value.

The data analysis demonstrates the relationship between the number of beers and the BAC, as well as the accuracy of the prediction made using the least-squares regression line. The R-squared value provides information on the strength of this relationship, which helps determine the usefulness of using the number of beers to predict BAC.

It's important to note that this analysis should be interpreted with caution, as factors such as body weight, gender, and other individual characteristics can also affect BAC levels.

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It represents an amine group.

When an element undergoes positron emission, the mass number remains the same, but the atomic number decreases by one unit.

Positron emission, also known as beta-plus decay, occurs when an unstable nucleus emits a positron (a positively charged electron). In this process, one of the protons in the nucleus is converted into a neutron, reducing the atomic number by one. The mass number, which represents the total number of protons and neutrons in the nucleus, remains unchanged because the total number of particles (protons + neutrons) is conserved.

The emission of a positron balances the charge in the nucleus since a proton (positive charge) is converted into a neutron (neutral charge) and a positron (positive charge) is emitted. This decay process occurs in certain radionuclides to achieve a more stable nuclear configuration.

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The balanced chemical reaction will be H₂O₂=H₂+O₂

Decomposition is as a chemical reaction in which one reactant breaks down into two or more products

Example   AB=A+B

The decomposition reaction of hydrogen peroxide can be written as:

                                        H₂O₂=H₂+O₂

According to law of conservation of mass, mass can neither be created nor be destroyed. Thus the number of atoms of each element must be same on reactant and product side

Therefore, the balance the equation for the decomposition reaction is

H₂O₂=H₂+O₂

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Answer:

Law of constant composition

Answer:

trtytytytytytyt

Explanation:

The correct statements are:

- The cake would be considered a product.

- Flour, sugar, eggs, and baking powder would be considered reactants.

In chemistry, a reactant is a substance that is used in a chemical reaction to produce another substance, known as a product. In the process of baking a cake, the flour, sugar, eggs, and baking powder are combined and undergo chemical reactions to produce the final product, which is the cake. Therefore, the flour, sugar, eggs, and baking powder would be considered the reactants, while the cake would be considered the product.

The ingredients in a cake are flour, sugar, eggs, and baking powder. The statements best describes the chemical process of baking a cake is The cake would be considered a product, Flour, sugar, eggs, and baking powder would be considered reactants. Therefore, option A and B are correct.

Baking is the process of cooking with dry heat, typically in an oven. It is most likely the oldest cooking method. Bakery products such as bread, rolls, cookies, pies, pastries, and muffins are typically made from flour or meal derived from grain.

When you bake a cake, the ingredients undergo a chemical transformation. When the molecules of two or more substances are rearranged to form a new substance, this is referred to as a chemical change.

The ingredients in a cake are flour, sugar, eggs, and baking powder. The statements best describes the chemical process of baking a cake is The cake would be considered a product, Flour, sugar, eggs, and baking powder would be considered reactants.

Thus, option A and B are correct.

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During hyperventilation, the pH of the blood increases (becomes more alkaline), while the carbon dioxide (CO2) level decreases. These changes are consistent with the prediction.

Hyperventilation refers to an increased rate and depth of breathing, leading to the removal of excess carbon dioxide from the body. As a result, the concentration of carbon dioxide in the blood decreases. Carbon dioxide reacts with water to form carbonic acid (H2CO3), which dissociates into bicarbonate ions (HCO3-) and hydrogen ions (H+). By reducing the carbon dioxide level, there is less production of H+ ions, resulting in an increase in blood pH, making it more alkaline.

The observed changes in pH and carbon dioxide levels during hyperventilation are consistent with the predicted response. Increased ventilation causes more carbon dioxide to be expelled from the body, shifting the equilibrium of the carbonic acid-bicarbonate buffer system. As a consequence, the pH of the blood rises, leading to alkalosis. These changes can be confirmed through blood gas analysis or other diagnostic tests.

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Answer:

0.2 M

Explanation:

Please see the attached pictures for the full solution.

The last one is the accurate answer

Salts such as \( Na_{2} SO_{4}\) are used in softening of hard water.

Hardness of water is the presence on water of dissolved metallic ions such as calcium and magnesium ions results in the water having additional properties such as taste.

Hardness of water is of significance in the laundry industry as it causes water to lather with difficulty and also produces sc_um.

To remove hardness of water or to soften water, salts such as \( Na_{2} SO_{4}\) are used.

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1.5 moles of H₂ are required to react completely with 14g N₂ in the chemical equation N₂ + 3H₂ ---> 2NH₃ .

This  tells us that in order to make two molecules of NH₃, we need one molecule of N₂ and three molecules of H2. To figure out how many moles (which is just a way of measuring how much of a substance you have) of H2 we need to react with 14.0 g of N₂, we can use the information from the equation.

First, we convert the 14.0 g of N₂ to moles (which means we're figuring out how many pieces of N₂ we have, because 1 mole = Avogadro's number of particles, or roughly 6.022 x 10²³).

14.0 g N₂ x (1 mol N₂/28 g N₂) = 0.5 mol N₂

Then, we use the mole ratio from the equation to figure out how many moles of H₂ we need:

0.5 mol N₂ x (3 mol H₂/1 mol N₂) = 1.5 mol H₂

So we'd need 1.5 moles of H₂ to react completely with 14.0 g of N₂.

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The number of moles to the equations are as follows;

1. 0.800 mol     2. 0.0814 mol      3. 0.162 mol

4. 2.8197 mol   5. 1.8798 mol    6. 2.8917 mol     7. 4mol of  LiNO3 should make 2 mol of Li2SO4

1. 0.400 x (2/1) = 0.800 mole

2. 7.50(1/46.07) = 0.1628

0.1628(1/2) = 0.0814 mol

3. 7.50(1/46.07) = 0.1628

0.1628(2/2) = 0.1628 mol

4. 150(1/159.69) = 0.9399

0.9399(3/1) = 2.88197 mol

5. 150(1/159.69) = 0.9399

0.9399(2/1) = 1.898 mole

6.  0.9399(3/1) = 2.88197 mol

7. 250(1/109.94) = 2.2737 mole

The above answer is based on the information below, that was gotten from the picture;

Using the equation:

C6H12O6 → 2 C2H5OH + 2 CO2

6. How many moles of CO2 are produced when 0.400 mol of C6H12O6 react?

7. How many moles of C6H12O6 are needed to form 7.50 g of C2H5OH?

8. How many moles of CO2 form when 7.50 g of C2H5OH are produced?

Using the equation:

Fe2O3 + 3CO → 2 Fe + 3CO2

9. Calculate the number of moles of CO that can react with 150 g of Fe2O3.

10. Calculate the number of moles of Fe formed when 150 g of Fe2O3 reacts.

11. Calculate the number of moles of CO2 formed when 150 g of Fe2O3 reacts.

Using the equation:

Pb(SO4)2 + 4 LINO3 → Pb(NO3)4+2 Li2SO4

12. How many moles of lithium nitrate will be needed to make 250 grams of lithium sulfate?

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Answer:

Water contains two parts of hydrogen and one part oxygen. Therefore, during the electrolysis of water the amount of hydrogen has collected in one of the test tubes is double than that of the oxygen produced and collected in the other last tube.

The energy required to convert 35.0 g of C2Cl3F3 from a liquid at 10.00 oC to a gas at 105.00 oC is 4.10 x 10^4 J Given:C2Cl3F3 has a normal boiling point of 47.6 oCMass of C2Cl3F3 = 35.0 gBoiling point of C2Cl3F3 = 105.00 oC - 47.6 oC = 57.4 oC

Heat of vaporization = 27.49 kJ/molMolar mass of C2Cl3F3 = 187.4 g/molHeat of vaporization (in J/g) = (27.49 kJ/mol) / (187.4 g/mol) = 146.6 J/gEnergy required to vaporize 35.0 g of C2Cl3F3 = (35.0 g) (146.6 J/g) = 5131 JQ1 = energy required to raise the temperature of 35.0 g of C2Cl3F3 from 10.00 oC to its boiling point = (35.0 g) (4.03 J/g·oC) (57.4 oC) = 8057 JQ2 = energy required to vaporize 35.0 g of C2Cl3F3 = 5131 JQ3 = energy required to raise the temperature of 35.0 g of C2Cl3F3 from its boiling point to 105.00 oC = (35.0 g) (1.52 J/g·oC) (47.6 oC) = 2572 JTotal energy required = Q1 + Q2 + Q3 = 8057 J + 5131 J + 2572 J = 15760 JIn Joules, 4.10 x 10^4 J = 41,000 J (approx.)Therefore, the energy required to convert 35.0 g of C2Cl3F3 from a liquid at 10.00 oC, to a gas at 105.00 oC is 4.10 x 10^4 J.

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