0.20dm
2. How many grams of salt, NaCl need to be dissolved in 0.50dm of solution to
make a 0.20moldm solution?

Answer:

The answer is

Explanation:

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

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

n = 2.0 moles

We have

N = 2 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Number of moles of boron (B) = 2

We have to find number of atoms present in the given amount of boron[tex].[/tex]

➤ We know that 1 mole of substance contains 6.022×10²³ particles (atoms/molecules).

★ Number of atoms present in B :

⭆ N = n × [tex]\sf{N_A}[/tex]

⭆ N = 2 × 6.022 × 10²³

⭆ N = 12.044 × 10²³

⭆ N = 1.2 × 10²⁴

Answer:

1.cation

2.anion

Explanation:

the plus is always cation and the negative is anion

Answer:

1. cation

2. anion

Explanation:

A positive ion is always cation and the negative ion is anion

Answer:

Precambrian

Explanation:

Answer:

An Eon

Explanation:

epcohs are the shortest geologic time frame, which make up periods, that make up eras, that make up eons.

Answer:

C. I

Explanation:

The elements are categorized in groups and periods. The periods are horizontal and the groups are vertical. The elements in the same group (vertical) have very similar characteristics.

Answer:

There are 6.023 x 10^23 fluorine atoms.

Explanation:

Answer:

I believe it is 2?

Explanation:

;v;

Answer:

false false false false

Not sure what you exactly mean, but I think what you are talking about are the spheres of earth (Lithosphere, Hydrosphere, Atmosphere, and Biosphere.)

Lithosphere (Terrestrial) is the land on earth. Hydrosphere (Hydrologic) is the water on earth.

I'm not sure if this is 100% correct but I'm guessing this is what you are referring to. It could be different across different science classes.

Answer:

46.A 47.B 48.B 49.A.50.A.51.B.52.B

The answer of the questions  serially is  true, false,false ,true,true,false and false where blood is  a tissue which circulated by the pumping organ that is heart.

Heart is a muscular organ which is present in most of the animals , it is responsible for pumping blood via the blood vessels to the entire body.The blood which is pumped carries oxygen and nutrients along with it.Along with it on it's way back to heart it carries carbon dioxide to the lungs.

Heart has an approximate size of a closed fist and is present between the lungs in the middle compartment of the chest. It is divided in to for chambers , the upper chambers called atria and lower ones called ventricles.

The wall of the heart is made up of three layers : epicardium,myocardium and endocardium. It pumps blood with a rhythm which is determined by a group of cells which are called the pacemaker cells present in the sinoatrial node.

Learn more about heart,here:

https://brainly.com/question/16566688

#SPJ5

Answer:

The goal of science is compared to engineering because engineering is there to solve problems while science is to explain natural phenomena

Explanation:

Answer:

D

Explanation:

Move the decimal and count the places

Answer:

The final step of the scientific method is to communicate the results​

Answer:

A. Ba

C. Cu

D. H

Explanation:

HOPE THIS HELPS

Answer:

0J

Explanation:

Work = Force * Distance

Since the distance (or the displacement) in this problem is 0, hence, no work is done. W = 150*0 = 0. The mass of the object is just trying to trick you. Hopes this helps!

Answer:

Detail is given below.

Explanation:

Atomic radius  trend along period:

As we move from left to right across the periodic table the number of valance electrons increases. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

we can see in picture A there is one positive charge and force of attraction is 2.30×10⁻⁸ N

In picture D there are 2 positive charge and force of attraction is 4.60×10⁻⁸ N

So by increasing the positive charge force of attraction also increases.

In F we can see there is more positive charge thus force of attraction is also greater.

Answer:

B) Ca(H2PO4)2

Explanation:

To solve this we must be knowing each and every concept related to chemical formula.  Therefore, the correct option is option B among all the given options.

The chemical formula is indeed a means of expressing information about just the chemical proportion of atoms that comprise a certain chemical compound as well as molecule through the use of chemical element numbers and symbols.

Furthermore, the molecular formula does not contain any words and does not serve as a chemical name. However, it just indicates basic chemical structures and is not the same as the entire chemical structural formula.  The correct formula for calcium dihydrogen phosphate is Ca(H[tex]_2[/tex]PO[tex]_4[/tex])[tex]_2[/tex].

Therefore, the correct option is option B among all the given options.

To know more about  chemical formula, here:

https://brainly.com/question/29031056

#SPJ2

Answer:

1-There Must be some displacement in the direction of force.                                                  2-Angle between force and displacement is 0°.                                                                            

Answer:

730 mL which is .73 L

Explanation:

Answer:

A B C D E

Explanation:

Answer:

No longer emitting heat or light, the white dwarf will become a black dwarf. Because it emits no radiation, it is nearly impossible to see. However, the black dwarf would still retain its mass, allowing scientists to detect the effects produced by its gravitational field.

Explanation:

Answer:

white dwarfs are hot, black dwarfs are cold

Explanation:

a white dwarf is a slowly burning and aging corpse of a main sequence star such as our sun. they are up to 40 times hotter then the sun, ranking among one of the hottest objects in the universe, except their luminosity is so low that all their heat stays in them basically forever.

On the other hand, a black dwarf is a theoretical ending to a white dwarf, over the course of trillions of years, white dwarfs cool down into black dwarfs. black dwarfs rank among the coldest possible temperature. We aren't sure if these are really a thing, because we still haven't given white dwarfs enough time to cool down.

Answer:

A joule divided a second

Explanation:

i took the test

plz give me brainlist :)

Explanation:

Electronic configuration of Nitrogen -

₇N = 1s² 2s² 2p³

Answer:

B. Divergent

The rift formed in the Divegent tectonic boundary between the North America and Eurasian Plates and is located now in Iceland (Im sorry im not good at explaining)

Answer:

Explanation:

It describes how much heat must be added to a unit of mass of a given substance to raise its temperature by one degree Celsius. ... The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT.

Answer:

The formula q=mcΔt explained below

Explanation:

so q represents the amount of heat energy. M is the mass of the object and c is the temperature of the object. Δt also known as delta is the change in temperature. It would be the final temperature minus the original temperature.

Answer:

kingdom, phylum, class, order, family, genus and species.

Explanation:

Answer: temperature liquefaction

Explanation: At the exact time the only used method or strategy the division of helium from natural gas is low temperature liquefaction