Unless otherwise informed report each
numerical answer in standard notation to 3
significant figures. point Pick the choice that
is the most reasonable metric measurement
for the mass of a bullet
a)420 mL
b) 420 ng
c)420 Gg
d)420 g
e)420 cg

An exothermic reaction is a reaction that produces heat this type of reaction is a chemical change.

The correct option is B.

Exothermic reactions are chemical in nature and are distinguished by the release of energy in the form of heat or light. One instance of this kind of reaction, when the release is in the form of both heat and light, is lighting a match. An exothermic reaction causes the release of heat, which raises the temperature of the surrounding area. An exothermic process process that absorbs heat cools the environment.

Polymerizations, combustion, thermite reactions, mixing potent acids and bases As an everyday example, hand warmers exploit the exothermic reaction brought on by iron oxidation.

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An atom's noble gas configuration starts with the elemental symbol of the last noble gas that came before it, then moves on to the arrangement of the remaining electrons.

A Lewis electron dot diagram, also known as an electron dot diagram, Lewis diagram, or Lewis structure, is a diagram that employs dots to represent the valence electrons of an atom. The number of dots corresponds to the atom's valence electron count.

Write the noble gas configuration & Lewis dot diagram for:

Be, O, AI, CI, Ni, Xe, W

The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

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0.74 mol/lit

You mixed  500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution

As per given in the above statement,

volume of fecl3 = 5oo.ml

fecl3 = 0.250 M

= 0.250 mol/litre

volume of Bacl2, = 175.0mL

Bacl2 = 0.350M

= 0.350 mol/litre

we need to calculate moles of fecl3 and

Bacl2

first :

fecl3= 0.250 mol/litre (Molarity)

moles of FeCl3, = molarity * volume

= 0.250 * 500 ml

= 0.125 moles

moles of fecl3 = 0.125 moles

now, bacl2 = 0.350M

moles of bacl2 = molarity * volume

= 0.350 * 175/1000

= 0.061 moles

furthermore:

one mole of bacl2 will give one mole of ba^+2 and 3 moles of cl-

0.125 moles of fecl3 = 3 * 0.125 cl-

= 0.375 moles of cl-

similarly :

one mole of bacl2 will give one mole of ba^+2 and 2 mole of cl-

= 0.061 moles of bacl2 = 2 * 0.061

= 0.122 moles of cl-

total volume of solution :

= 500 ml + 1750 ml

= 0.675 litre

total number of moles of cl-

= 0.375 + 0.122

= 0.497 moles

now,

molarity of cl- =  total moles of solute / volume of solution

= 0.497 moles/ 0.675 litre

= 0.74 mol/lit

molarity of cl- = 0.74 mol/lit

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Based on the concept of conductivity, if it conducts heat or electricity, it allows heat and electricity to pass through it.

Conductivity is the ability of certain materials to allow heat ad electricity to flow or pass through them easily.

Conductivity is the opposite or resistivity or insulation which is the property of material that makes them restrict the movement of heat or electricity through them.

Materials that allow heat and electricity to flow through them easily are called conductors.

Conductors are mostly metallic objects because metals allow heat and electricity to flow through them easily.

Other conductors are the electrolytes which are substances which when in molten form, allow electricity to easily pass through them.

In conclusion, conductivity denotes the ability of a material to allow heat and electricity to pass through it.

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Any chemical compound that has carbon-hydrogen or carbon-carbon bonds is considered an organic substance in chemistry. Millions of organic compounds have been identified because of carbon's capacity for catenation.

Arrange the following compounds in the order indicated below

and explain carefully the factors that lead to each other.

The acid gets stronger the more EWG there is. Furthermore, the acid will be more potent if EWG is located closer to the source (COOH).

In sequence of increasing acidity:

(CH 3) 2CHCOOH < CH3CH2COOH < CH3COOH < ClCH2CH2COOH < ClCH2COOH

Similar to R groups, +I groups raise nitrogen's electron density, which raises an amine's basicity (an electron-rich substance is basic). The basic character of the supplied amines is influenced by the number of R groups on nitrogen. Basicity is also influenced by steric obstruction. Less basicity and more steric obstruction.

(CH3)2NH > CH3NH2 > (CH3 )3N > NH3

​

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Answer:

Melting and boiling points are unique to the chemicals just like facial recognition. That does not necessarily means it is like a fingerprints.

Explanation:

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The number of unit cells in the given quantity is 2.23x10²³ unit cells

:Given Aluminum has an atomic mass of 27g mol-1

>Crystal is face-centered cubic structure

 >number of aluminium atoms in l0 g mass        

 so w =10g

> the number of unit cells in the given quantity is to be calculated 

Number of atoms of Al  = (mass /molar mass ) x Nₐ

                        =(w/M)xNa   , where Na =6.022x 10²³

There are 4 atoms present in the unit cell it will crystallize in a face-centered  cubic crystal
.>.On solving the above values

we get the number of unit cells as= (10/27)x 6.022x10²³ unit cells

The number of unit cells in the given quantity is 2.23x10²³  unit cells

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The density of the can is 0.041 g/mL.

The term density is the ratio of the mass to the volume of an object. We know that the volume is an intrinsic property of the substance. The volume does not change thus, it can be used to identify a substance.

Now we have that the volume of the liquid that the can could hold is 332 ml. This is the real volume of the aluminum can. The mass of the can is found to be 13.5g.

Density = mass/volume = 13.5g /  332 ml = 0.041 g/mL

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carbon molar mass: 12.011 x 2

hydrogen molar mass: 1.008 x 7

nitrogen molar mass: 14.0067

- add all values together:

(12.011x2) + (1.008x7) +1 4.011 = 45.09 g

Answer:

cause the pot is probably boiling over making a ton of bubbles and foam

Explanation:

One time explanation of one observation is a hypothesis.

Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.

For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.

Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.

For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.

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1. To prepare 0.5 M NiCl₂ solution, dissolve 64.8 g of NiCl₂ in 1 L of water

2. To prepare 0.5 M NiCl₂.6H₂O solution, dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water

1. How to prepare 0.5 M NiCl₂ solution

We'll begin by obtaining the mole of NiCl₂. This can be obatined as follow:

Mole = Molarity x Volume

Mole of NiCl₂ = 0.5 × 1

Mole of NiCl₂ = 0.5 mole

Finally, can obtain the mass of NiCl₂ needed to prepare the solution as follow:

Mass = mole × molar mass

Mass of NiCl₂ = 0.5 × 129.6

Mass of NiCl₂ = 64.8 g

Thus, to prepare 0.5 M NiCl₂, dissolve 64.8 g of NiCl₂ in 1 L of water

2. How to prepare 0.5 M NiCl₂.6H₂O solution

We'll begin by obtaining the mole of NiCl₂.6H₂O This can be obatined as follow:

Mole = Molarity x Volume

Mole of NiCl₂.6H₂O = 0.5 × 1

Mole of NiCl₂.6H₂O = 0.5 mole

Finally, can obtain the mass of NiCl₂.6H₂O needed to prepare the solution as follow:

Mass = mole × molar mass

Mass of NiCl₂ = 0.5 × 237.6

Mass of NiCl₂.6H₂O = 118.8 g

Thus, to prepare 0.5 M NiCl₂.6H₂O dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water

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Answer:

to the left of his table :)

The number of aluminum atoms you lost, given the data from the question is 3.67×10²⁶ atoms

We'll begin by obtaining the mass of the aluminum atoms lost. This is illustrated below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of aluminum lost = 2.699 × 6.1×10³

Mass of aluminum lost = 16463.9 g

Finally, we shall determin the number of atoms of aluminum lost. This can be obtained as follow:

From Avogadro's hypothesis

1 mole of aluminum = 6.02×10²³ atoms

But,

1 mole of aluminum = 27 g

Thus,

27 g of aluminum = 6.02×10²³ atoms

Therefore,

16463.9 g of aluminum = (16463.9 g × 6.02×10²³ atoms) / 27 g

16463.9 g of aluminum = 3.67×10²⁶ atoms

Thus, 3.67×10²⁶ atoms of aluminum were lost

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To calculate mass of CaCO3, individual mass of the elements is taken (Ca= 40.1g/mol, C= 12.0g/mol, O=16.0g/mol). So, 40.1+12.0+48.0 = 100.1gmol. Therefore, 100.1 g/mol is the answer.

Calcium carbonate is a source of calcium in the supplemental form. It is also present as a part of exoskeleton in certain animals. It is also found as a component in eggshells.

It is obtained from carbon resources. Calcium carbonate is industrially used in production of limescale and in plaster of paris for roofing. It is often used to treat hyperacidity and given as an antacid.

Thus, calcium carbonate has wide range of chemical applications.

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When 12 moles of O₂ (g) react with C₃H₈O (g) then 8 moles of CO₂ (g) is produced. This is the chemical combustion reaction of propanol producing vapor of CO₂.

Alcohols undergo combustion reaction in the presence of oxygen gas to produce vapor of CO₂ and water.

In the given equation,

2 C₃H₈O (g) + 9 O₂ (g) → 6 CO₂ (g) + 8 H₂O (g)

To calculate the number of moles of CO₂ produced, first we have to balance the equation:

Divide the equation by 2

C₃H₈O (g) + 9/2 O₂ (g) → 3 CO₂ (g) + 4 H₂O (g)

Calculate the number of moles of CO₂ (g) produced with 1 mol of O₂ (g)

9/2 O₂ (g) → 3 CO₂ (g)

1 O₂ (g) → 3÷9/2 CO₂ (g) = 0.66 mol CO₂ (g)

For 12 mol of O₂ (g),

12 × 0.66 = 8 mol CO₂ (g)

Therefore, 8 mol of CO₂ (g) is produced from 12 mol of O₂ (g).

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The required empirical formula

This is further explained below.

Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.

As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.

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Answer:

The answer(s) will be A and B

Explanation:

Hope this helps and may God bless you<3

A 39.2 g sample of copper took up the 4.4 cm³ of space , so the Density of the copper sample is 8.9 g/cm³.

Density is the ratio of the mass of a substance and the volume occupied by that substance. Density measures how tightly-packed the particles in a substance are the more tightly packed the particles are, the denser the substance will be.

The formula for calculating the density of a substance is given below as:

Density = mass/volume

Given :

The mass of the copper sample = 39.2 g

The volume of the copper sample = 4.4 cm³

Hence, the density of the copper sample will be:

The density of copper sample = 39.2 g/4.4 cm³

The density of copper sample =8.9 g/cm³

Therefore, the density of the copper sample is 8.9 g/cm³

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Answer: 8.9

Explanation: sample of 39.2 grams sample of copper took up to 4.4 centimeters of space. And then you will get the density of the copper piece in g/cm3.

Answer: 0.1533 moles of NH3

Explanation: The reaction need 2 moles of ammonia and 3 moles of copper oxide to take place. If you have 0.230 moles of copper oxide you need:

0.230/3=0.0767*2=0.1533 moles of NH3

The process which most likely involves collecting physical evidence at a crime scene is she collecting anything that could be related to the crime and is denoted as option D.

This is referred to as unlawful behavior which is punishable by the law of an area or country and examples include theft, murder etc.

When crime takes place such as in the case of a murder, a professional who is referred to as a forensic scientist is invited to the scene so as to collect anything that could be related to the crime as this will help in the investigations by the appropriate bodies and ensure that justice is served.

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Answer: D. She will collect anything that could be related to the crime.

Explanation:

Answer:

In order to draw the 3-D structure of an organic compound, we can use wedge-dash representation.

Nutrient molecules are important because the body breaks down nutrient  molecules into absorbable molecules that can produce energy in the body for carrying out daily tasks.

Therefore, nutrient molecules are important for overall growth of our body.

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Answer:

1.128*10¹⁹ [GHz].

Explanation:

1) the initial formula is

E=hν, where ν - required frequency,

2) according to the formula above

[tex]\nu=\frac{E}{h};\\ \nu=\frac{748*10^{-8}}{663*10^{-36}}=1.128*10^{28}[Hz][/tex]