Simplify (4f+13g)(2w)

Answer:

D

Explanation:

Just took the test, Hope this helps!

Answer:

B. Atomic radius decreases along periods and increases down groups.

Explanation:

It decreases in period because of addition of proton effective nuclear charge increase and atomic radius decreases.

Atomic radius increases in group because of addition of shells

Answer:

uses of photosynthesies:

Explanation:

In photosynthesis ENERGY from light is used to convert CARBONDIOXDE and water into glucose and oxygen for 6 carbon and 6 water molecules, 1 glucosed and 6 oxygen molecules are produced.

What is photosynthesis?

The process by which green plants and some other organisms use sunlight to synthesize nutrients for their nourishment is called Photosynthesis.

Some requirements of photosynthesis to take place :-

Result ( product ) of photosynthesis :-

When the process of photosynthesis is completed, it releases Oxygen as a by-product.

Chemical Equation for Photosynthesis :-

[tex] \sf6CO_2 + 6H_2O \binom{sunlight \: and \: chorophyll}{ \rightarrow} C_6H _ {12} {O _6 + 6O_2} \uparrow[/tex]

Scroll from right to left to see the whole solution.

Answer:

Technology, science and knowledge are important in modern contemporary society. The understanding of how social, cultural and material elements influence the production of new practices, new ways of understanding and new institutions is vital in our understanding of contemporary postmodern society.

Explanation:

1. impact of technological development on everyday life, 2. debates about the cultural significance of science and technology

Hope this helped! Brainlist?

Answer:

The importance of Science and Technology is so that if your tryin to prove your point with science you have to be educated on that in order to actually prove it. and for technology if we didn't have that we will not be able to know what is going on in society.

Explanation:

Answer:

0.86 g/mL

Explanation:

In order to solve the problem, you have to know the formula for "Density." Density refers to "mass per unit volume." It's formula is:

Next, we have to convert the units of measurement in accordance to what is being asked in the problem. It is asking for "g/mL," which means we have to convert 1.25 quarts (qt.) to mL and 2.25 pounds (lbs.) to grams.

Let's solve.

1.25 qt. x [tex]\frac{946.35 mL}{1 qt.}[/tex] = 1,182.94 mL

2.25 pounds x [tex]\frac{453.592 grams}{1 pound}[/tex] = 1,020.58 grams

Now that we converted them to their appropriate units of measurement, we can now solve for density.

The density of the motor oil is 0.86 g/mL

Answer:

This question perplexes me somewhat. If we as humans are not able to detect a scent or odor from certain substances, that does not of necessity mean those substances are not giving off an odor, and are therefore not “truly” odorless, just odorless to the less sensitive noses of humans.

Water is supposedly odorless, but I know quite well of a test where subjects did a blind tasting, only instead of wine these people were tasting Australian waters, sourced from different locations around the country.

All of these tasters (professionals) were able to differentiate the waters and from what I recall, were all accurate. These wine buffs use their palates as well as their taste-buds, so, were there no odor, their task would have had a greater degree of difficulty.

My own baby sister has such a sensitive palate that she can tell you if you serve her a glass of water from the fridge whether that water was fresh, straight from the tap (unfiltered), filtered or had been boiled before and whether it had been boiled for more than five minutes or not. Truly.

So I would find it difficult to answer your question, “What substances are truly odorless?” , because I am not sure of the criteria you mean by “truly” odorless. In other words, If you are talking about zero degrees, are you talking of the freezing point of water, absolute zero or zero degrees Kelvin?

I’m sure there are substances that are odorless, to humans, but are those same substances “truly” odorless, or only to our perception of them?

Hope this helps, have a wonderful day/night, and stay safe!

Answer:

RbF2 + Ca

Explanation:

Since Rb is located in IIA as well as Ca, Rb has ion form Rb2+

Hence CaF2 + Rb → RbF2 +Ca

Please be reminded, this answer may not be 100% correct

Answer:

YIKES. a bit late. Answers include 1, 2, 3

Explanation:

Answer:

true mass is based on gravity

Answer:

true

Explanation:

mass based on gravity

Answer:

An object which experiences either a change in the magnitude or the direction of the velocity vector can be said to be accelerating. This explains why an object moving in a circle at constant speed can be said to accelerate - the direction of the velocity changes.

Explanation:

Answer:

An object which experiences either a change in the magnitude.

Explanation:

the direction of the velocity changes.

Hope that helps :)

Have a good day

Answer:

cause of the sun rotation

Explanation:

Answer:

The world is tilting on an edge that creates seasons.

Explanation:

And that's why different parts of the have different climates.

Answer:0.00061L He

Explanation:Avogadro constant, N = 6.02214076*10^23 per mole

at STP 1 mole = 22.71L

1.64*10^19 He = ( 1.64*10^19/N)*22.71 = 1.64*10^19*[3.77*10^-23] = 6.18*10^-4L

000610 L volume is occupied by 1.64 x 1019 atoms of Helium gas at STP. Therefore, option C is correct.

The nominal conditions in the atmosphere at sea level are referred to as standard temperature and pressure (STP). These are the conditions: 0 degrees Celsius and 1 atmosphere (atm).

It is written as V = nRT/P. "P" stands for pressure, "V" stands for volume, n stands for the number of moles of a gas, "R" stands for the molar gas constant, and "T" stands for temperature.

The International Union of Pure and Applied Chemistry (IUPAC) utilized to define STP as 0 ᵒC (273.15 K, or 32 ᵒF) and 1 atm (101.325 kPa = 760 Torr) .

Avogadro constant, N = 6.023 × 10^23 per mole

At STP 1 mole = 22.71L

1.64 × 10^19 He = ( 1.64 × 10^19/N) × 22.71

= 1.64 × 10^19 × [3.77 × 10^-23]

= 6.18 × 10^-4L

= 000610 L He

Thus, option C is correct.

To learn more about the STP, follow the link;

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Answer:

*helps and doesnt get deleted*

Explanation:

Answer:

1. 7860 Feet = 1.488 miles

A= 1

B= 5280

2. 0.565 miles = 2983.2 feet

C= 0.565

D= 1

Explanation:

1. Convert 7860 feet to miles

1 miles= 5280 feet

1 Feet= 1/ 5280 miles

7860 Feet= 7860 ( 1/ 5280) miles

7860 Feet = 1.488 miles

A= 1

B= 5280

2. Convert 0.565 miles to feet

1 mile= 5280 feet

0.565 miles = 5280 feet * (0.565/1)

0.565 miles = 2983.2 feet

C= 0.565

D= 1

We see that when we have to convert feet into miles we divide the number by 5280 because feet are smaller than miles. Similarly when we have to convert miles into feet we multiply by the given number because miles are greater than feet.

The above method used is called the unitary method but we should always keep in mind that conversion from smaller to bigger units require divsion and from bigger to smaller units require multiplication.

Answer:

precipitation reaction

The  replacement reaction occurs when magnesium chloride solution reacts with sodium carbonate solution and form [tex]MgCO_{3}[/tex] white precipitate.

Learn about replacement reaction.

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Answer:

448

Explanation:

K =273+°c

K=273+175

K=448

The net ionic equation : Ag⁺(aq)+l⁻(aq) ⇒ Agl(s)

Given

Reaction

AgF(aq)+Nal(aq) ——> Agl(s)+NaF(aq)

Required

The net ionic equation

Solution

The equation of a chemical reaction can be expressed in the equation of the ions

In the ion equation, there is a spectator ion that is the ion that does not react because it is present before and after the reaction  

When these ions are removed, the ionic equation is called the net ionic equation  

AgF(aq)+Nal(aq) ——> Agl(s)+NaF(aq)

Ag⁺(aq)+F⁻(aq)+Na⁺(aq)+l⁻(aq) ⇒ Agl(s)+Na⁺(aq) + F⁻(aq)

Ag⁺(aq)+l⁻(aq) ⇒ Agl(s)

Answer:

do you have a picture of the choices?

Answer:

6 x 10 (power to the 15) H2

Answer:

i dont know the answer but you could search up photon calculator, hope this helps (im very sorry i couldnt help but i havent learned about that yet, im in 9th grade)

Answer:The atoms cool down and become slower and their bonds become close and they move less.

Explanation:I took science

Answer:

0.768g of Fe are in the tablet = 38.4% by mass of Fe in the tablet

Explanation:

The balanced redox equation of Fe²⁺ with KMnO₄ in acidic medium is:

5Fe²⁺ + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O

Where 5 moles of Fe²⁺ react per mole of KMnO₄

The moles required of KMnO₄ are:

27.50cm³ * (1dm³ / 1000cm³) = 0.0275dm³ * (0.100mol / dm³) = 0.00275mol KMnO₄

Moles of Fe²⁺ are:

0.00275mol KMnO₄ * (5 moles Fe²⁺ / 1mol KMnO₄) = 0.01375moles of Fe²⁺

In grams (Molar mass Fe: 55.845g/mol):

0.01375moles of Fe²⁺ * (55.845g/mol) =

And percentage is:

0.768g Fe / 2.000g * 100 =

Stock solutions contain a standardized concentration of the solute in a solution. To prepare 50 mL of solution with a ratio of 1:1000 solution, 5 gms of the drug will be required.

Dilution is the property of the solution with a less amount of solute concentration than the stock solution. A dilute solution is prepared by the addition of more solvent.

The addition of the solvent in a solution decreases the molar concentration which leads to dilution.

The ratio of 1:1000 means that 1 gm of the drug is present in 1000 mL (1L) of solution.

1000 mL = 1 gm × 500 mL × X gm

Here, the X represents the 0.5 gm of drug dissolved in 500 mL.

The amount of drug used is calculated as,

5 mL ÷ 50 ml = 0.5 g ÷ X g

X = 0.5 × 50 ÷ 5

= 5 gm

Therefore, 5 gm of the drug is required to prepare 50 mL of solution.

Learn more about dilution here:

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Answer:

A yan hehehehe

salamat puso ma ah

Answer:

0.071 moles of Na₃PO₄ .

Explanation:

Given data:

Number of molecules of Na₃PO₄ = 4.3× 10²² molecules

Number of moles = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

4.3× 10²² molecules × 1 mol / 6.022 × 10²³ molecules

0.71× 10⁻¹ mol

0.071 mol

The number 6.022 × 10²³ is called Avogadro number.

"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"

Answer:

I think the answer is A the Afracan plate

Explanation:

hope this helps:)