Do you think children are safe when they are taken to ECD centre during this pandemic crisis​

Formal charge = number of valence electron - 1/2 bonded electron - lone pair electron

a. N3 =  number of valence electron - 1/2 bonded electron - lone pair e-

    = 5 - 2/4 - 4

    = -1

b. CO = number of valence electron - 1/2 bonded electron - lone pair e-

         Charge on carbon

       =  4 - 2 - 6/2

        = -1

charge on oxygen

number of valence electron - 1/2 bonded electron - lone pair e-

= 6 - 2 - 6/2

  = +1

c. NO3

by making structure we found that each oxygen has different charge in this compound.

O = -1, -1 , 0

N = 0

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The correct answer for  volume would the krypton occupy are 29.8 mL , 5375 mL , 6.5 * 10^ 5 mL .

We can solve this problem by using Boyle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant temperature, the pressure

of the gas is inversely proportional to its volume"

Mathematically:

pV = const. where

p is the pressure of the gas

V is its volume

We can rewrite the formula as

PiVi = P2V2

For the gas in this problem:

P=0.400atm is the initial pressure

Vi 75.0mL is the initial volume

765mm Hg 1.006am is the final pressure (using the conversion factor

1atm = 760atm )

Solving for V2, we find the final volume:

V 2 =p1vi/ p2 =(0.400) (75.0)/ 1.006 = 29.8mL

We can solve this part by using again the equation:

Where in this case we have:

p 1= 0.400at is the initial pressure

V_{1} = 75mL is the initial volume

p_{2} = 4, nm*H_{0} is the final pressure

Converting into atmospheres,

p_{2} = 4 Hg 7mm/d -0.00536m

And solving for V2, we find the final volume:

V_{2} = (p_{1}*V_{1})/p_{2} = ((0.4)(75))/0.0056 = 5357mL

e)

As before, we use Boyles' Law:

p{1}*V{1} = p{2}*V{2}

In this part we have:

p{1} = 0.4atm is the initial pressure of the gas

V{1} = 75mL is the initial volume of the gas

p{2} = 3.5 * 10 ^ - 2   torr

1 torr is equivalent to 1 mmHg, so the conversion factor is the same as before.

therefore the final pressure in atmospheres is:

p2=3.50 *10^-2 2mm Hg 760mmHg/atm 4.6-10-atm

And so, the final volume of the krypton gas is:

V{2} = (p{1}V{1})/p{2} = ((0.4)(75))/(4.6 * 10 ^ - 5) = 6.5 * 10 ^ 5 * mL.

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The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL

0.8 mL of the liquid contains 80.0 mg of the drug.

The recommended dose is 15 mg per kg of body weight

The infant to be given the drug weighs 17 lb.

First, let's convert the weight of the infant to kg.

1 lb = 453.59 g

17 lb =       453.59 x 17/1

                   = 7711.03 g

1000 g = 1 kg

7711.03 g = 7711.03 x 1/1000

               = 7.711 kg

So, the baby's weight is 7.711 kg.

The drug dose for the baby can thus be calculated as:

15 mg x 7.711 = 115.67 mg

But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?

                   0.8 x 115.67/ 80.0 = 1.16 mL

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Answer:

A.

Explanation:

Spiders are creepy.

That your answer.

Moon geological research is based on observations made using telescopes on Earth, measurements made by spacecraft in orbit, lunar samples, and geophysical data.

Oxygen (O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminum (Al), manganese (Mn), and titanium are among the substances known to exist on the lunar surface (Ti). The most plentiful ones include silicon, iron, and oxygen. The estimated oxygen concentration is 45%. (by weight). Due to solar wind deposition, carbon (C) and nitrogen (N) seem to be present only in very small amounts.

Impact craters, associated ejecta, a few volcanoes, hills, lava flows, and depressions filled with magma are the main features of the lunar surface.

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Answer:

check explanation

Explanation:

Sodium Iodide=NaI

Potassium perchlorate=KClO4

Calcium nitrate= Ca(NO3)2

Copper (ii) sulfate=CuSO4

Answer:

Explanation:

Click the link and you can see the explanation from brainly.

Answer:

An Igneous rock turns into a Sedimentary rock after going through two processes.

Explanation:

An igneous rock is crushed into little shards of rock called sediment, the sediment is then packed together by other rocks or strong forces, that form together to make a Sedimentary rock.

You can see the image for your explanation.

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Igneous rocks are broken down into sediments which are then compressed by forces of water, wind to form sedimentary rocks.

They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.

The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.

They are classified based on origin in to 4 types which are clastic, biochemical ,chemical and other sedimentary rocks.While based on composition they are classified as siliciclastic,carbonate ,evaporite,organic rich,siliceous ,iron-rich and phosphatic sedimentary rocks.

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Answer:

1,2,6,8,8

Explanation:

1.3511=1

2.473 =3

5.687524=6

7.555=8

8.235=8

4.63 gram of Cooper(II) chloride contain 2.17 grams of Cu²+

Molar mass of copper(II) chloride = 134.45 g/mol

Molar mass of copper = 63 grams

The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D). The mass of each isotope is multiplied by its abundance to produce the atomic mass, which is a weighted average of all the isotopes of that element.

63 gram of copper is present in 134.45 g/mol of copper(II) chloride

1 gram copper is present in copper(II) chloride = 134.45/63 = 2.13 gram

2.17 gram Cu²+ in copper(II) chloride = 2.13 gram x 2.17 gram = 4.63 gram

Hence, 4.63 gram of Copper(ii) chloride contain 2.17 grams of Cu²+

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Answer:

A

Explanation:

A rise in temperature means that there is more thermal energy which will be used in the reaction by the sugar/sucrose, that is why solubility increases with temperature increase

Answer: The solubility of a solid increases as the temperature increases.

Explanation: THE ANSWER!! okay everbody

Answer:

Molar mass is used to convert mass to moles, or moles to mass. Avogadro's number is used to calculate the number of particles in a given number of moles, or to calculate the number of moles in a given number of particles.

Answer: false

Explanation: A model is a representation of a more complex system

The number of mole of tin (Sn) that you have is 0.058 mole

6.02×10²³ atoms = 1 mole of tin (Sn)

With the above information, we can obtain the number of mole ot tin. Details below

We can obtain the number of mole of tin as follow:

6.02×10²³ atoms = 1 mole of tin (Sn)

Therefore,

3.5×10²² atoms = (3.5×10²² atoms × 1 mole) / 6.02×10²³ atoms

3.5×10²² atoms = 0.058 mole of tin (Sn)

Thus, the number of mole of tin (Sn) you have is 0.058 mole

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Forest Food web consists of the producers, main consumers, secondary consumers, scavengers, and decomposers. Food web is the collection of the large number of food chains.

Numerous food chains make up a food web. As animals seek food, a food chain only follows one way. As an example, a hawk consumes a snake following the consumption of a frog, a grasshopper, and grass. A food web illustrates the numerous relationships between plants and animals.

1. Primary consumers

2. Secondary consumers

3. Tertiary consumers

4. Decomposers or phytoremediators

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The statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations (option B).

A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.

On the other hand, a scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.

A theory is simply a hypothesis confirmed by observation or experiment.

Therefore, the statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations.

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Answer:

Calcium tungstate

287.93 g/mol

The de Broglie wavelength of the bullet traveling at 1649 miles per hour is  1.3 x 10^34 m.

The  wavelength that is associated with an object in relation to its quantum and mass is known as de Broglie wavelength.

The particles de Broglie wavelength is inversely proportional to its force.

de Broglie wavelength is expressed as : ^ = h/mv

Where ^ is wavelength, h is plank constant, m is mass and v is velocity.

1 miles = 1.60934 km

So  1649 miles = 2653.8 km

Then 2653.8 x 1000/ 60x60 = 737.2 ms -1.

The momentum  of bullet is p = mv = 0.00693kg x 737.2 ms-1

                                                          = 5.109 kg/ms

Now, de Broglie wavelength = h/p = 6.63 x 10^-34 / 5.109 kg/ms

                                                           =  1.3 x 10^34 m

Thus, de Broglie wavelength of the bullet traveling at 1649 miles per hour is  1.3 x 10^34 m.

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Advertisements on the internet, television, and radio try to get you to buy something by making a claim or statement. These claims will often sound scientific and it makes the claim as factual, and fictional as well as an exaggeration.

Advertising must be truthful and must not deceive consumers. If important details are omitted or the assertion implies something untrue, it may be misleading. For instance, if substantial and hidden fees are payable upon lease signing, a leasing advertisement for an automobile that advertises "$0 Down" may be deceptive.

Additionally, statements must be supported, particularly when they relate to performance, safety, or health. Depending on the product, the claims, and what experts deem necessary, the type of evidence may vary. Following is the list of sources to show the inference of the product advertised,

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Explanation:

try this option (all the details are in the attachment).

Density of the liquid is 0.418g/mL

The liquid sample has a volume of 0.000275 L. We can convert this to mL (because we are asked to find the density in g/mL):

mass of liquid= 0.115 grams

volume of the liquid, V= 0.000275L

Density is defined as the ratio of mass per unit volume

Now we must convert the unit of volume from L to ml as liter is SI unit which goes with Kilogram

volume in ml = 0.000275 ml/l x 1000 =0.275 ml

Density d = mass/volume

                = 0.115/ 0.275

                = 0.418 g/mL

Hence the density of the liquid is 0.418 g/mL

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The oxidation number of the cobalt is +2 while the oxidation number of iron is +3.

According to the crystal filed theory, the ligands serve as point charges and when they are introduced to the symmetrical octahedral crystal field, the field splits and the there is a barry center with electrons that are above and below the barry center depending on their energy.

Hence, we can see that cobalt II ion is a d7 specie with electron configuration; [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^7[/tex]. The iron III ion is a d5 specie having electron configuration[tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^5[/tex]. The oxidation number of the cobalt is +2 while the oxidation number of iron is +3.

The crystal field diagram of each of the ions is shown in the image attached.

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Answer:

Nebula Was Sent Into Space By Supernova

This shock wave compresses the material it passes through and is the only place where many elements such as zinc, silver, tin, gold, mercury, lead and uranium are produced. Over several months the gases cool and fade in brightness and join the debris of interstellar space.

Answer:   This shock wave compresses the material it passes through and is the only place where many elements such as zinc, silver, tin, gold, mercury, lead and uranium are produced. Over several months the gases cool and fade in brightness and join the debris of interstellar space.

Explanation:

The majority of elements are found in mixtures of two or more isotopes in nature. Every element's isotope has a set mass and a natural percent abundance. These isotopes' masses in their respective abundances must be reflected in the element's mass.

These are the reasons for different values of weighted average atomic mass.

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