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Multiple Choice Virtual 3
1. (4.10) Which atom has the greatest nuclear charge (positive charge in the nucleus)?
a. Ar
C. S
b. Si
d. Mg

Answer:

C

Explanation:

The answer is C because only that amount can move

The greenhouse effect is the process that occurs when gases in the Earth's atmosphere trap heat from the sun.

The greenhouse effect is one of the factors that make the Earth a livable place. This process makes the Earth much warmer than it would be without an atmosphere.

This trapped heat increases the temperature of the Earth, causing dangerous ripple effects such as melting ice sheets, rising sea levels, and flooding.

It also causes warming and affects many aspects of the climate, including surface and ocean temperatures, precipitation, and sea level.

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Answer:

1:1

Explanation:

Based on Avogadro's law, the volume of an ideal gas is directly proportional to the moles (Or number of molecules) presents of this gas under constant temperature.

The volume of the gas is independent to the nature of the gas

Using this law, we can change the state as:

X number of molecules of CO₂ in X number of molecules of CH₄ (Because are occupying the same volume). That means the ratio of molecules is:

Answer:

2 C4H10     +  13  O2    ====>   8  CO2      + 10 H2O

Explanation:

But pH is quite an important measurement of water. Maybe for a science project in school you took the pH of water samples in a chemistry class ... and here at the U.S. Geological Survey we take a pH measurement whenever water is studied. Not only does the pH of a stream affect organisms living in the water, a changing pH in a stream can be an indicator of increasing pollution or some other environmental factor

Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide \(\rightarrow \) zinc sulphide + calcium nitrate

balance equation : \(Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)\)

total ionic equation :

\(Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)\)

net ionic equation :

\(Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)\)

b) potassium + calcium chloride  \(\rightarrow \) potassium chloride + calcium

balance equation : \(2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)\)

total ionic equation :

\(2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca\)

net ionic equation: \(2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca\)

Answer: 6.97 g

Explanation:

Grams of potassium sulfate must be added to make 200. mL of a 0.200 M potassium sulfate solution are 6.96.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

No. of moles of solute = 0.04

Mass of potassium sulfate = 174.2 × 0.04

Mass of potassium sulfate = 6.96 grams

Therefore, Grams of potassium sulfate must be added to make 200. mL of a 0.200 M potassium sulfate solution are 6.96.

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The hydrosphere include glaciers, groundwater, and polar ice. That is option A, B and C.

Hydrosphere is defined as the part of the earth that is made up of water which includes the surface of the planet, underground, and in the air.

The water found in the hydrosphere of earth moves in cycles in such a way that non is lost.

The components of the hydrosphere include the following:

The polar ice is part of the hydrosphere because it is the frozen part of the earth's hydrosphere.

The lava is not part of the hydrosphere but part of lithosphere and it's released when volcanic eruptions occurs.

Therefore is can be concluded that glaciers, groundwater, and polar ice are parts of the hydrosphere while the lava is not part of the hydrosphere.

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Answer:

an electronic temperature probe and a computer

Answer:

It’s 3

Explanation:

Answer:

Conc. of H+ IONS

Explanation:

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.

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Answer:

A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and accelerated rate calorimeters are among the most common types.

Explanation:

Explanation:

An apparatus for measuring the heat generated or absorbed by either a chemical reaction, change of phase or some other physical change is a calorimeter.

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Answer:

The composition of air this is because it vmade up of oxygen, nitrogen, Nobel gages and Carbon dioxide

Answer:

-52.87 F

Explanation:

- The formula is (K - 273.15) × 9/5 + 32 = F.

- So, substitute in the value of the degree Kelvin: (226 - 273.15) x 9/5 + 32 = F.

- Then, it will be: -47.15 x 9/5 +32.

- According to "BODMAS", the terms connected with the division sign (i.e. 9/5) will be solved first, resulting to: -47.15 x 1.8 +32.

- The terms connected with the multiplication sign (i.e. -47.15 x 1.8) will be solved next, leading to: -84.87 + 32.

- The final answer will be: -52.87 F.

Thus, if converted, 226 degrees Kelvin will be equal to -52.87°F.

The phrase that defines bond energy is the energy required to break a chemical bond.

Bond energy is amount of energy needed to break the atoms involved in a chemical bond into free atoms.

The bond energy of each molecule varies with the type of bond in the molecule. Stronger bonds require a higher bond energy and vice versa.

Therefore, the phrase that defines bond energy is the energy required to break a chemical bond.

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Answer:

D. Energy input needed to break bonds of reactants.

Explanation:

Activation energy is the minimum amount of energy required to initiate a chemical reaction by breaking the bonds of the reactants. It is the energy needed to reach the transition state, where the reaction can proceed, and new chemical bonds can be formed to create the products. The activation energy is the energy barrier that must be overcome for a reaction to occur.

Once the reactants have enough energy to overcome the activation energy, the reaction proceeds spontaneously, and energy is released when new bonds form in the products.

PS. I took the quick check.

Answer:

the answer is: 10

Explanation:

To find density you do mass divided by volume

The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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Answer:

4.1g of Cr will make (317/104) x 4.1 = 12.5g of CrCl3

Answer:

287K

Explanation:

To find the increasing in temperature for the sample of copper we must use the equation:

Q = m*C*ΔT

Q is the heat added (353J)

m is the mass of copper (3.6mol * (63.546g / mol) = 228.8g

C is specific heat (0.385J/(gK))

And ΔT is the increasing in temperature.

Solving for ΔT:

Q / m*C = ΔT

353J /228.8g*0.385J/(gK) = 4.0K

That means the final temperature of copper is:

283K + 4K =

Answer:

The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed So yes we can create matter because matter is every where buildings ,structures etc. So the answer is yes!

Explanation:

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The answer  is 2 mL of preservative-free saline must be added.

First we need to find the concentration of the radiopharmaceutical kit before it is reconstituted. We can do this by dividing the activity (350 mCi) by the volume (7 mL), which gives us a concentration of 50 mCi/mL.

Next, we need to determine how much of this concentrated solution is needed to obtain 30 mCi. We can use a proportion:

50 mCi/1 mL = 30 mCi/x mL

Solving for x, we get x = 0.6 mL.

Therefore, we need to add 0.6 mL of the concentrated solution to the kit, which already contains 5 mL of diluent. This gives us a total volume of 5.6 mL, with a concentration of approximately 5.36 mCi/mL.

Finally, we need to dilute this solution to a total volume of 7 mL. We can use another proportion:

5.36 mCi/5.6 mL = x mCi/1 mL

Solving for x, we get x = 0.96 mCi/mL.

To obtain a total activity of 30 mCi, we need to use:

30 mCi/0.96 mCi/mL = 31.25 mL

Therefore, we need to add 31.25 - 5.6 = 25.65 mL of preservative-free saline to the kit.

Rounding to the nearest tenth, we get 25.7 mL. However, since the question asks for the volume in milliliters, we need to subtract the 5.6 mL of diluent already in the kit, giving us a final answer of 20.1 mL.

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To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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The total mass of 4 tin is in grams is 580 grams and in kg is 0.58kg.

One tin of chopped tomatoes weight is 145 grams

and we have to calculate it for 4

so for 4

145*4 =580 grams

and we have to change it into kilograms so

580 /1000  = .58kg

By 1,000, divide the number of grams.

To convert from grams to kilograms, simply divide by 1,000 because there are 1,000 grams in every kilogram. If necessary, construct the equation using fractions. Put the number of grams over 1 and divide it by the conversion factor, which is 1 kg / 1,000 g. Your answer in kilograms will result from the cancellation of the grams. Remember to use the appropriate units to mark your response.

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the concentration of glucose in the unknown solution is 9.23 x 10^-5 mol/L. The absorbance of a mixture containing 1 ml of hexokinase reagent and 10 μl of a glucose solution with an unknown concentration was measured at 340 nm and found to be 0.575.

Convert the absorbance value to the molar concentration of NADH Since the molar extinction coefficient for NADH we can use the Beer-Lambert law, which states that A = εlc, where A is the absorbance, ε is the molar extinction coefficient, l is the path length.
 

Convert the molar concentration of NADH to the concentration of glucose. The hexokinase reaction converts glucose to glucose-6-phosphate, while consuming NADH in the process. Therefore, the ratio of NADH consumed to glucose consumed is 1:1. it is also the molar concentration of glucose in the solution.

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Metalloids are located along the staircase lines of the periodic table and have the properties of both metals and nonmetals .

The term is usually applied to a group of six to nine elements (boron, silicon, germanium, arsenic, antimony, tellurium, and possibly bismuth, polonium, astatine) near the middle of the P block or main block of the periodic table. increase.

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