Which of the following is NOT a natural toxin that can contaminate food?a. Ciguatera
b. Methyl Mercury
c. Aflatoxins
d. Dioxins

Answers

Answer 1

Answer: Option b. Methyl Mercury (quick silver)

It is a metal that is liquid at room temperature. It's a poisonous mercury. it forms when bacteria react with mercury in water, soil, or plants. It's been used to preserve grain that is fed to animals. It's used in fluorescent lights, batteries, polyvinyl chloride and latex paint.

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Name two elements that have properties similar to copper

Answers

Nickel and iron . Tin and zinc. Gold and silver. They all have properties similar to copper

Final answer:

Silver and gold are two elements which have properties similar to copper. These common properties include sheen, malleability, ductility, and their ability to conduct heat and electricity, attributable to their similar atomic structures.

Explanation:

Two elements that have properties similar to copper, which is a metal, include silver (Ag) and gold (Au). All these elements fit into the same category - metals, that demonstrate certain characteristics:

They appear shiny, and have the ability to be formed into different shapes (malleable) and drawn into wires (ductile).
They act as good conductors of heat and electricity.

These properties stem from their similar atomic structures, placed in the same group on the periodic table.

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A piece of sodium metal reacts completely with water as follows: 2Na(s) + 2H2O(l) ⟶ 2NaOH(aq) + H2(g) The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 246 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 25°C = 0.0313 atm.)

Answers

Answer:

$\large \boxed{\text{0.449 g}}$

Explanation:

1. Gather all the information in one place

M_r: 22.99

2Na + 2H₂O ⟶ 2NaOH + H₂

$\, p_{\text{tot}} = \quad \text{1.00 atm}\np_{\text{H2O}} = \text{0.0313 atm}$

T = 25.0 °C

V = 246 mL

2. Moles of H₂

To find the moles of hydrogen, we can use the Ideal Gas Law:

pV = nRT

(a) Calculate the partial pressure of the hydrogen

$p_{\text{tot}} = p_{\text{H2}} + p_{\text{H2O}}\n\text{1.00 atm} =p_{\text{H2}} +\text{0.0313 atm}\np_{\text{H2}} = \text{0.9687 atm}$

(b) Convert the volume to litres

V = 246 mL = 0.246 L

(c) Convert the temperature to kelvins

T = (25.0 + 273.15) K = 298.15 K

(d) Calculate the moles of hydrogen

$\begin{array}{rcl}\text{0.9687 atm}* \text{0.246 L} & = & n * 0.082 06 \text{ L}\cdot\text{atm}\cdot\text{K}^(-1)\text{mol}^(-1) * \text{298.15 K}\n0.2383 & = & 24.47n \text{ mol}^(-1)\n\nn & = & \frac{0.2383}{24.47\text{ mol}^(-1)}\n\n& = & 0.009740 \text{ mol}\n\end{array}$

3. Moles of Na

The molar ratio is 2 mol Na: 1 mol H₂

$\text{Moles of Na} =\text{0.009 740 mol H}_(2) * \frac{\text{2 mol Na}}{\text{1 mol H}_(2)} = \text{0.019 48 mol Na}$

4. Mass of Na

$\text{Mass of Na} = \text{0.019 48 mol Na} * \frac{\text{22.99 g Na}}{\text{1 mol Na}} = \text{0.449 g Na}\n\n\text{The mass of Na used was $\large \boxed{\textbf{0.449 g}}$}$

The number of grams of sodium used in the reaction will be approximately 0.1387 grams.

To calculate the number of grams of sodium used in the reaction, we need to use the ideal gas law and consider the effect of the vapor pressure of water on the pressure of the collected hydrogen gas.

Given data:

Volume of hydrogen gas (V) = 246 mL = 0.246 L

Pressure of hydrogen gas (P) = 1.00 atm

Vapor pressure of water (P_water vapor) = 0.0313 atm (subtracted from the total pressure)

Temperature (T) = 25.0°C = 298.15 K

The ideal gas law is given by the equation: PV = nRT, where n is the number of moles of the gas.

First, calculate the total pressure by subtracting the vapor pressure of water from the given pressure of the gas:

Total pressure (P_total) = P - P_water vapor

= 1.00 atm - 0.0313 atm = 0.9687 atm

Now, rearrange the ideal gas law equation to solve for n (moles of gas):

n = PV / RT

Plug in the values:

n = (0.9687 atm × 0.246 L) / (0.0821 L·atm/mol·K × 298.15 K)

n ≈ 0.01206 mol

According to the balanced chemical equation, 2 moles of sodium (Na) produce 1 mole of hydrogen gas (H₂). Therefore, the number of moles of sodium used in the reaction is half of the calculated moles of hydrogen gas:

Moles of sodium = 0.01206 mol / 2 = 0.00603 mol

Finally, calculate the mass of sodium (molar mass of sodium = 22.99 g/mol)

Mass of sodium = Moles of sodium × Molar mass of sodium

Mass of sodium = 0.00603 mol × 22.99 g/mol

≈ 0.1387 g

Therefore, the number of grams of sodium used in the reaction is approximately 0.1387 grams.

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How many phases does a solution have?explain

Answers

Did you perhaps mean the phase of matter?If so, then a solution has only one phase of matter: liquid. It is always almost always liquid because solutions are made up of a solvent and a solute and a solvent is always a liquid. Though, some may come in an emulsion form, but still it can be considered as liquid

Final answer:

A solution can exist in three phases: solid, liquid and gas, depending on the temperature and pressure. The pH of the solution can also change based on the nature of ions present in it. Understanding the nature and properties of solutions is crucial for many chemical reaction processes.

Explanation:

A solution can exist in three phases depending on the temperature and pressure, which are: gas, liquid, and solid. These are depicted in a phase diagram (an illustrative depiction that shows the states of a substance under different conditions of temperature and pressure).Consider the phase diagrams for a pure solvent and a solution. When a nonvolatile solute is dissolved in a solvent, a solution is formed. These states coexist and are in a state of thermal equilibrium at specific combinations of pressures and temperatures.

In addition to the physical phase, the pH of the solution can also be considered as a 'phase.' The pH can decrease, increase, or even show a pattern of increase and then decrease depending on the nature of ions present in the solution.

Solutions are crucial to life-sustaining processes as well as other chemical reaction processes. It's important to know the nature of solutions and factors determining its formation and properties for understanding various biological, geological and industrial processes.

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If fluorine 20 undergoes beta decay , what will it become ?

Answers

to be honest im not for sure because you don't have any answer choices

Fluorine 20 will decay to stable.

Which balanced equation represents a fusion reaction?

Answers

Fusion reaction is a type of nuclear reaction where two or more nuclei combine or collide to form an element with a higher atomic number. This happens when the collision is in a very high speed. In this process, some of the matter of the fusing nuclei is converted to photons.

Select all that apply.Hydraulic systems work because _____.
liquids are incompressible
pressure is transmitted equally throughout a liquid
gases are incompressible
pressure and force are the same thing

Answers

Answer;

Liquids are incompressible
Pressure is transmitted equally throughout a liquid

Explanation;

-Hydraulic systems works on the idea that, unlike gasses, liquids cannot be compressed. Therefore, a system that transfers pressure through liquid to aid in the lifting of an object can be created.

-Force that is applied at one point is transmitted to another point using an incompressible fluid. This force is created on the piston which generates or creates a pressure that will be transmitted equally to all parts of the system, then to the load and this pressure creates a force that will lift the load on the load piston.

because liquids are incompressible

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