According to dimensional analysis, which of the following is the correct set-up
for the problem "How many milligrams are there in 67 kiolgrams?"
1 mg
a) 67 kg x
1 g
10 kg
10 g
108
b) 67 kg x
1
mg
X
1 kg
10 g
10² mg
(102
c) 67 kg x
g
7
1 kg
1 mg
10-3 kg
1 mg
d) 67 kg x
х
10 kg
A a
Bb
C C​

Answer:

nnmnm

Explanation:

Answer:

silver?

Explanation:

Statement 1 is false because heat is the movement of molecules.

Statement 2 is true because matter is composed of elementary particles which are VERY small.

Statement 3 is false because the kinetic energy of a particle determines its heat and it is impossible for a particle to be completely motionless.

Statement 4 is false because neutrons do not have a charge and make up a large portion of all matter.  

Answer:

Option 1. K and MgBr2

Explanation:

From the question given above, we obtained the following data:

2K + MgBr2 —> 2KBr + Mg

In a chemical reaction, the reactants are located on the left side of the equation while the products are located on the right side.

The reactants are separated from the products by an arrow sign.

Considering the question given above,

Element /compound >>> location

K, MgBr2 >>>>>>>>>>>>> Left

KBr, Mg >>>>>>>>>>>>>> Right

From the illustration above, the reactants (i.e element/compound on the right side) are K and MgBr2

Answer:

19, K, 39.098

Explanation:

Potassium is a chemical element with symbol K and atomic number 19.

Atomic Mass: 39.098u

Complete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O

Combustion of butane (C₄H₁₀) :

[tex]\tt 2C_4H_{10}+26O_2\rightarrow 8CO_2+10H_2O[/tex]

2.46 g water(H₂O) were produced​

[tex]\tt \dfrac{2.46}{18}=0.137[/tex]

[tex]\tt \dfrac{2}{10}\times 0.137=0.0274[/tex]

MW : 58,12 g/mol

[tex]\tt mass=mol\times MW\\\\mass=0.0274\times 58.12\\\\mass=\boxed{\bold{1.592~g}}[/tex]

Answer: False

Explanation:

[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]

Actually Welcome to the Concept of the Chemical Bonding.

Since we know that, calcium shares 2 electrons and Bromide being a halogen accepts 1 electron at a time,

So 2 bromides combine together to form a bond with Calcium, so we get as,

Ca2+ + 2Br -----------------------> CaBr2

CaBr2 is the compound formed.

Answer:

Here are possible ways to improve health and quality of life:

-Exercise almost everyday

-Be more positive

-Get rid of bad habits

-Start good habits

-Get new things

-Learn New things

Answer:

a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Answer:

1.51*10^23 atoms Rb

Explanation:

Use dimensional analysis

Answer:

Creativity

Skepticism

Reasoning

Explanation:

Scientists must see a creative way to solve problems in the world. Scientists must also be skeptic about what is said, because if they were not, no one would disagree and the problems would never be solved. Reasoning is a must, as reasoning is involved in the scientific process and writing conclusions to their studies.

Hope this help!

Answer:

B

Explanation:

I think it is B. That is because when you are falling, your just going to fall faster and faster.

I hope this helps!

Answer:

B

Explanation:

The third force the jumper experiences is a spring force due to the bungee cord. The amount that the bungee cord pulls back on the jumper depends on how far the cord has been stretched, i.e. the farther the jumper has fallen, the more the cord pulls back on him or her.

Purview is the word that best replaces reach without changing the meaning of the sentence. Therefore, the correct option is option B.

A sentence is indeed a collection of words used to express a thought. A sentence always begins with such a capital letter then concludes with a period, punctuation mark, and exclamation point. Ideal sentence construction has a verb and a subject. Declarative sentences make a declaration, express an opinion, or make an emotion known.

Declarative sentences have a period at the end. Questions are asked in sentences known as interrogatives. These phrases are followed by a question mark. This kind of phrase is used to give instructions or make a request. There is typically a period at the end, but occasionally there is also an exclamation point. Univocal means having only one possible meaning. Purview is the word that best replaces reach without changing the meaning of the sentence.

Therefore, the correct option is option B.

To know more about statement, here:

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Answer/Explanation:

Animals are multicellular heterotrophic organisms, meaning they cannot generate their own food, they rely on external sources of nutrition.

Protists are any eukaryotic organism that cannot be classified as an animal, plant, or fungus. The grouping is more used for convenience than anything else.

Like animals, animal-like protists can move freely and are heterotrophic. However, unlike animals, they are usually unicellular, and much simpler than animals

Answer:

C

Explanation

Because My teacher told me that for an example Florida is hot but in Central America is cold or hot and you don’t need a jacket. I don’t remember much

The Central America is near the equator could explain the above statement.

Equator is an imaginary line that passes through the centre of the globe at 0 degrees latitude and at equal distance between the North and South Poles.

Some countries of Central America are situated near the equator. The places near equator have little seasonal variation. These places have same amount of daylight and darkness throughout the year and remain warmer year round. These places near the equator have an alternating dry and rainy seasons.

Hence, we can conclude that option C is the answer.

To learn more about equator here

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Answer:

K, Rb and Cs

Explanation:

Answer:

krypton, bromine, and argon

Answer:

Air/gas

Explanation:

Sound can travel faster through air/gas more effectively than solids or liquids.

if an electron is passed from Ago B then Slides electrons which makes it electropositive i.e A+

According to the redox reactions , when an electron is transferred from A to B , B molecule has been reduced as it gains electrons.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

Learn more about redox reactions,here:

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Answer:

A chemical change is required to separate the elements present in it.

Explanation:

The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.

Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.

Therefore, we see that only the first choice satisfies this problem.

Answer:

They are found the same way but use different symbols when found.

Explanation:

Answer:

B

Explanation:

to find how many moles we have you need to use the molarity equation which for this is

40g * (1mole/200g) = .2 moles

Given we know that we have .2 moles

then all you have to do is divide amount of moles by amount of liters to find the molarity

for this problem it is

.2mol/2L which is .1 M

Answer:

Vanadium

Explanation:

Atomic number increases, thereby changing into an atom of Vanadium

Answer:

Vanadium

Explanation:

Science rocks

Answer:

a. up

b. down

c. up

d. up

Explanation:

Answer:

Just as interesting as the effects of heat transfer on a system are the methods by which it occurs. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, as through a cooking pan, or slowly, as through the walls of a picnic ice chest. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet every heat transfer takes place by only three methods:

Conduction is heat transfer through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know that thermal motion of the atoms and molecules occurs at any temperature above absolute zero.) Heat transferred from the burner of a stove through the bottom of a pan to food in the pan is transferred by conduction.

Convection is the heat transfer by the macroscopic movement of a fluid. This type of transfer takes place in a forced-air furnace and in weather systems, for example.

Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of Earth by the Sun. A less obvious example is thermal radiation from the human body.

:)

Further more info...

Conduction:

As  you walk barefoot across the living room carpet in a cold house and then step onto the kitchen tile floor, your feet feel colder on the tile. This result is intriguing, since the carpet and tile floor are both at the same temperature. The different sensation is explained by the different rates of heat transfer: The heat loss is faster for skin in contact with the tiles than with the carpet, so the sensation of cold is more intense.

Convection :

In convection, thermal energy is carried by the large-scale flow of matter. It can be divided into two types. In forced convection, the flow is driven by fans, pumps, and the like. A simple example is a fan that blows air past you in hot surroundings and cools you by replacing the air heated by your body with cooler air. A more complicated example is the cooling system of a typical car, in which a pump moves coolant through the radiator and engine to cool the engine and a fan blows air to cool the radiator.

Radiation :

You can feel the heat transfer from the Sun. The space between Earth and the Sun is largely empty, so the Sun warms us without any possibility of heat transfer by convection or conduction. Similarly, you can sometimes tell that the oven is hot without touching its door or looking inside—it may just warm you as you walk by. In these examples, heat is transferred by radiation. That is, the hot body emits electromagnetic waves that are absorbed by the skin. No medium is required for electromagnetic waves to propagate. Different names are used for electromagnetic waves of different wavelengths: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Answer:

Carbon dioxide, water and light are all needed for photosynthesis to take place. Photosynthesis happens in the leaves of a plant.

Explanation:

P = 11.133 atm (purple)

T = -236.733 °C(yellow)

n = 0.174 mol(red)

Some of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated),:  

So that the three laws can be combined into a single gas equation, the ideal gas equation  

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

To choose the formula used, we refer to the data provided

Because the data provided are temperature, pressure, volume and moles, than we use the formula PV = nRT

T= 10 +273.15 = 373.15 K

V=5.5 L

n=2 mol

[tex]\tt P=\dfrac{nRT}{V}\\\\P=\dfrac{2\times 0.08205\times 373.15}{5.5}\\\\P=11.133~atm[/tex]

V=8.3 L

P=1.8 atm

n=5 mol

[tex]\tt T=\dfrac{PV}{nR}\\\\T=\dfrac{1.8\times 8.3}{5\times 0.08205}\\\\T=36.42~K=-236.733^oC[/tex]

T = 12 + 273.15 = 285.15 K

V=3.4 L

P=1.2 atm

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.2\times 3.4}{0.08205\times 285.15}\\\\n=0.174~mol[/tex]

Answer:

It all started with the big bang.

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).

Explanation:

In solids, the particles are tightly packed together. In liquids, the particles have more movement, while in gases, they are spread out. Particles in chemistry can be atoms, ions or molecules. It is important to understand the particle nature of matter.