A chemist adds 215.0mL of a 6.0x10^−5/mmolL mercury(II) iodide HgI2 solution to a reaction flask. Calculate the micromoles of mercury(II) iodide the chemist has added to the flask. Round your answer to 2 significant digits.

Answer:

7mL of sterile water is the initial amount of the concentrated solution is 3mL

Explanation:

In this problem, the vial must be diluted from 5mg/mL to 1.5mg/mL, that means the solution must be diluted:

5mg/mL / 1.5mg/mL = 3.33 times

If the initial amount of the drug in the vial is 3mL, the final volume must be:

10mL

That means the volume of water that should be added is:

10mL - 3mL:

Answer:

dk

Explanation:

Answer: Photosynthetic organisms take light energy and use it to make their own "food". In this process they use carbon dioxide and light to make sugars and oxygen. This is great for other animals that utilize this oxygen and eat the plants for food.

HOPE THIS HELPS

Photosynthesis is the source of energy in the ecosystem. Without this energy source, there will be no food available to predators such as wolf or

tiger.

In the ecosystem, energy is transferred along the food chain. The food chain shows the feeding relationships among living organisms in the ecosystem.

The green plants are the primary producers. They are able to trap energy directly from the sun and make their own food through the process of photosynthesis.

It is this energy from the food that they make through photosynthesis that is passed along the food chain as herbivores eat green plants and are in turn eaten by the predators.

Also, green plants produce oxygen during photosynthesis which is taken in by animals such as wolf or  tiger and is used in the breakdown of complex food materials.

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The mole ratio of H2SO4 and H2O in the equation = 3:3

Given

Reaction

Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O

Required

Balanced equation

Solution

Fe₂O₃ + H₂SO₄ → Fe₂(SO₄)₃ + H₂O

aFe₂O₃ + bH₂SO₄ → Fe₂(SO₄)₃ + cH₂O

Fe, left = 2a, right=2⇒2a=2⇒a=1

S, left=b, right=3⇒b=3

H, left = 2b, right = 2c⇒2b=2c⇒2.3=2c⇒c=3

The equation becomes :

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{4.816 \times {10}^{24} }{6.02 \times {10}^{23} } = 8 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

there are 8 moles.

Answer:

38 moles of oxygen

Explanation:

This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining): Ni(CO)₄. A chemical engineer has determined by measurements that there are 9.6 moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?

Step 1: Given data

Chemical formula of nickel tetracarbonyl: Ni(CO)₄

Moles of nickel: 9.6 moles

Step 2: Establish the molar ratio of nickel to oxygen

According to the chemical formula, the molar ratio of nickel to oxygen is 1:4.

Step 3: Calculate the moles of oxygen that accompany 9.6 moles of nickel.

We will use the previously established molar ratio.

9.6 mol Ni × (4 mol O/1 mol Ni) = 38 mol O

Answer:

reduce friction

Explanation:

Lubricants are needed to reduce the friction between two bodies in contact with one another.

Frictional force is a force that opposes the motion of a body. As a body moves forward, friction acts in an opposite direction.

Answer:

The movement of molecules

Answer:

All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Like the combustion reaction in a furnace, some chemical reactions require less energy to break bonds in reactants than is released when bonds form in products

Explanation:

Answer: Sugar and fat

Explanation:

Answer:

Tsunamis are usually triggered by earthquakes, volcanic eruptions and underwater explosions, landslides and other mass movements. Underseas earthquakes have generated nearly all the major tsunamis in history. Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water.

Explanation:

Answer A is correct because of the fact that tsunamis can be caused by underwater explosions

The best description that shows the relationship between earthquake and tsunami is an underwater earthquake can cause a tsunami.

The correct option is (A).

Tsunamis are waves that form when the ocean surface moves suddenly due to earthquakes.

Some other causes of tsunami are landslides on the sea floor land collapsing into the water, massive volcanic eruptions, or a meteorite strike in the ocean.

The displacement or collision of tectonic plates of earth lithosphere causes earthquake.

The earthquake in the sea or ocean surface leads to tsunami.

Thus, option (A) An underwater earthquake can cause a tsunami is the correct option.

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Answer:

hope you like my answer

Explanation:

this is the answer

Answer:

[tex]M_{C_9H_{13}NO_3}=183.23g/mol[/tex]

Explanation:

Hello!

In this case, since the molar mass of a chemical compound is computed by averaging the atomic mass of each element in the molecule and the amount of atoms; which in this case there are 9 carbon atoms, 13 hydrogen atoms, 1 nitrogen atom and 3 oxygen atoms; thus, we compute the average as shown below:

[tex]M_{C_9H_{13}NO_3}=m_C*9+m_H*13+m_N+m_O*3[/tex]

Now, we plug in the atomic masses to obtain:

[tex]M_{C_9H_{13}NO_3}=12.01*9+1.01*13+14.01+16.00*3\\\\M_{C_9H_{13}NO_3}=183.23g/mol[/tex]

Best regards!

Answer:

nitrogen

Explanation:

The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere. Why do I care?

nitrogen is the most abundant gas in the atmosphere

Answer:

d-multiply the mass of a mole by its molar mass

Explanation:

Mass of an element, Z, which is measured in grams is related to the number of moles contained in that element and its molar mass, which can be expressed using the formula:

number of moles (n) = mass ÷ molar mass

This means that the mass (in grams) can be calculated by multiplying the number of moles in the element by its molar/atomic mass. That is;

Mass (g) = number of moles (n) × molar mass (MM)

Answer:

Explanation:

This image is a good example of the law of conservation of mass because it shows that mass is not created or destroyed. We can see this in the picture because there's 4 hydrgen and 2 oxygen atoms in the reactants (the left side of the arrow) and there's 2 oxygen atoms and 4 hydrogen atoms in the products (right side of the arrow). Since there's the same amount of atoms on both sides, then law of conservation of mass applies.

Stealing your points like how you stole mine! +*♡

Don't answer someone's question with some nonsense and then delete it; especially when I spent over an hour on that one question. I will surely delete my answers after this and still have my 15 points...

don't reap what you sow :)

You can search that up if you don't even know what that means.

Have a nice day! +*♡

Hope this helped.

one if them is phosphate

Answer:                 Absolute zero is denoted as 0 K on the Kelvin scale, −273.15 °C on the Celsius scale, and −459.67 °F on the Fahrenheit scale.                    

Explanation: the lowest temperature that is theoretically possible, at which the motion of particles that constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to –273.15°C or –459.67°F.

Answer:

Absolute Zero is the absence of heat energy, aka the lowest possible temperature. In Kelvin absolute zero is just 0 because the Kelvin scale starts at 0. In celsius it is -273.15 degrees

Answer:

iii) An anion is a positive ion.

cuz an anion is negatively charged ion

The INCORRECT statement is "An anion is a positive ion".

So, the correct option is iii.

An atom can lose and gain one or more electrons from outermost shell which is known valence shell and formed an ions.

An atom gain one or more electrons and form negative charged species called an anion.

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Answer:

a change from a solid to a liquid

Explanation:

Answer:

Dissolving salt in water is a chemical change.

Explanation:

A log burning is a chemical reaction, but not change. All the others are obviously not the answer.

Answer:

the correct answer is W on edge 2020

Explanation:

I took the test

The mouth part of an insect which is  best adapted for chewing leaves is the one labelled as'W'as it shows presence of sharp teeth which help i tearing.

Insects are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms.

The total number of extant species is estimated at between six and ten million; potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within.

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Answer:

stop moving

Explanation:

Answer: keep the same inertia

Imagine two people in a tug-of-war. If both sides are balanced, then this means that the flag in the middle won't move. This idea applies to any object in which multiple forces are applied to it. If the forces cancel out, then the object will stay at rest if it's already at rest. If the object is in motion, then it will stay in motion. This is Newton's First Law of Motion. It describes inertia of an object, which is the tendency of it to speed up or slow down (more or less).

Answer:

[tex]f=2x10^8Hz[/tex]

Explanation:

Hello!

In this case, given that frequency of the electromagnetic radiation showing off a wavelength of 1.25 m is computed by using the speed of light as shown below:

[tex]f=\frac{c}{\lambda }[/tex]

We plug in the wavelength and speed of light to obtain:

[tex]f=\frac{3x10^8m/s}{1.25m } \\\\f=2x10^8Hz[/tex]

Best regards!

The frequency will be "[tex]2\times 10^8 \ Hz[/tex]".

Radiation which thus travels throughout waves as well as which has both electromagnetic energy.

The power of electromagnetic radiation could range from minimum to maximum. Radio waves, radiation, x-rays, and gamma radiation are all examples of electromagnetic radiation.

Given value:

Wavelength, [tex]\lambda = 1.25 \ m[/tex]

Speed of light, [tex]c = 3\times 10^8[/tex] m/s

The frequency be:

→ [tex]f = \frac{c}{v}[/tex]

By putting the values,

     [tex]= \frac{3\times 10^8}{1.25}[/tex]

     [tex]= 2\times 10^8[/tex] Hz

Thus the above response is right.

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Answer:

here you go

Explanation:

Answer:

Question: What Is The Correct IUPAC Name For S2F8? X ( ( (I) (IV) Di- Mono- Penta- Tetra- Tri- Hepta- Octa- Hexa- Fluorine Selenide Flourate Sulfide Sodium Sulfate Sulfur Fluoride Hydrate Acid.

Answer:

HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)

Explanation:

From the question given above

HNO₃ + H₂O —> ?

Nitric acid, HNO₃ reacts with water, H₂O to form aqueous solution of nitric acid as illustrated below:

HNO₃ + H₂O —> HNO₃ (aq)

Nitric acid is a strong acid and, so will ionised completely when dissolved in water. This is illustrated below:

HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)

Answer:

its A!! i just got finished my assignment and went straight on here because the other person didn't answer right. Trust me,its right!! good luck people<3

Explanation:

Answer:

Both liquids and gases are fluids

Explanation:

fluids are substances that flow, and gases also flow.

The phases of nitrogen in order of increasing density is solid, liquid, and gas.

In conclusion, the correct option is D.

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Answer:

Ether

SN1 mechanism

Explanation:

The nucleophile in this reaction is CH3OH. It is a poor nucleopile. We already know that a poor nucleophile reacting with a tertiary alkyl halide often leads to the substitution product as the major product.

Also, the iodide ion is a good leaving group. This makes the SN1 substitution more likely yielding the ether as the major product as shown in the image attached.

Answer:

2450 mg

Explanation:

From the given information:

The total weight of the capsule = 12.5 mg + 37.5 mg

= 50 mg

The percentage of drug in each capsule = [tex]\dfrac{12.5}{50} \times 100[/tex]

= 25%

= 0.25

To make 0.5 mg of drug in each  100 mg of powder after dilution;

Then, the drug percent in each capsule after dilution is:

[tex]=\dfrac{0.5}{100}\times 100[/tex]

= 0.5%

= 0.005

Suppose (p) mg represent the amount that is added to the diluent in the given capsule. Then;

The total amount is = (50 + p) mg

Since the amount of the drug = 12.5 mg

Then the concentration  [tex]=\dfrac{12.5}{50 + x}[/tex] which needs to be equal to the needed concentration that is diluted.

i.e.

[tex]\dfrac{12.5}{50 + x} = 0.005[/tex]

By cross multiply;

(50 + x) 0.005 = 12.5

(50 × 0.005) + (0.005x) = 12.5

0.25 + 0.005x = 12.5

0.005x = 12.5 - 0.25

0.005x = 12.25

x = 12.25 / 0.005

x = 2450 mg

Thus, there is a need for an additional 2450 mg to make a dilution that compass 0.5 mg of drug in 100 mg powder.