The number of particles in 3.5 moles of NaCl is

Answer:

true

Explanation:

Answer:

Answer : The correct answer for mass of KBr = 2.53 g

Given :

Molarity of KBr solution = 0.85 M

Volume of KBr solution = 25 mL

Converting volume from mL to L ( 1 L = 1000 mL )

Volume of solution = 25 mL * \frac{1 L }{1000mL}Volumeofsolution=25mL∗

1000mL

1L

Volume of solution = 0.025 L

Mass of KBr = ?

Mass of KBr can be calculated using following steps :

1) To find mole of Kbr :

Mole of KBr can be calculated using molarity .

Molarity : It is defined as mole of solute present in volume of solution in Liter .

It uses unit as M or \frac{mol}{L}

L

mol

It can be expressed as :

Molarity = \frac{mol of solute (mol)}{volume of solution (L)}Molarity=

volumeofsolution(L)

molofsolute(mol)

Plugging value of molarity and volume

0.85 \frac{mol}{L} = \frac{mol of Kbr}{0.025 L}0.85

L

mol

=

0.025L

molofKbr

Multiplying both side by 0.025 L

0.85 \frac{mol}{L} * 0.025 L = \frac{mole of KBr}{0.025 L} * 0.025 L0.85

L

mol

∗0.025L=

0.025L

moleofKBr

∗0.025L

Mole of KBr = 0.02125

2) To find mass of Kbr :

Mass of Kbr can be calculated using mole . Mole can be expressed as :

Mole (mol) = \frac{mass (g) }{molar mass \frac{g}{mol} }Mole(mol)=

molarmass

mol

g

mass(g)

Mole of Kbr = 0.02125 mol

Molar mass of KBr = 119.00 \frac{g}{mol}

mol

g

Plugging values in mole formula

0.02125 mol = \frac{mass (g)}{119.00 \frac{g}{mol}}0.02125mol=

119.00

mol

g

mass(g)

Multiplying both side by 119.00 \frac{g}{mol}

mol

g

0.02125 mol * 119.00 \frac{g}{mol} = \frac{mass (g)}{119.00 \frac{g}{mol}} * 119.00\frac{g}{mol}0.02125mol∗119.00

mol

g

=

119.00

mol

g

mass(g)

∗119.00

mol

g

Mass of KBr = 2.53 g

Answer:

Option A is correct (barite)

Explanation:

Given data:

Mass of  mineral = 51.00g

Volume of water = 50.0 mL

Volume of water + mineral = 61.4 mL

Density of mineral = ?

Solution:

First of all we will calculate the volume of mineral.

Volume of mineral = (volume of water + mineral) - Volume of water

Volume of mineral = 61.4 mL - 50.0 mL

Volume of mineral = 11.4 mL

Density of mineral:

d = m/v

d = 51.00 g / 11.4 mL

d = 4.48 g/cm³ (1mL = 1 cm³ )

Thus the mineral is barite.

Answer:

Cs, Cr, Cl

Explanation:

The Placement Of The Elements Increase In Electro Affinity.

Answer:

Number of valence electrons

Explanation:

Answer:

There are 12 atoms in the compound

A photon has a frequency of 2.68 × [tex]10^6[/tex] Hz then the energy of a photon is [tex]1.78\times10^{-27}\text{J}[/tex].

What is meant by Planck's equation?

Planck's energy–frequency relation, or Planck's equation, gives the relationship between the energy of a photon and frequency. This equation is given by,

E = hv

Where, E be the energy of a photon

h be the Planck constant

v be the frequency

Given:

Frequency is 2.68 × [tex]10^6[/tex]

Planck's constant is 6.63 × [tex]10^{-34}[/tex] Js

The energy of a photon is given by,

E = hv

substitute the values in the above equation, we get

= 6.63 × [tex]10^{-34}[/tex] Js × 2.68 × [tex]10^6[/tex] Hz

simplifying the above equation, we get

= 1.78 × [tex]10^{-27}[/tex] J

The energy of the photon is 1.78 × [tex]10^{-27}[/tex] J.

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Answer:

i think its c

The ionic compound from the options listed is : ( C )   H₂O₂

Ionic compounds are compounds formed by positively charged ions ( cation ) and negatively charged ions ( anions ) and they are neutrally charged because they are made up of equal number of positive and negative ions.  

Ionic compounds are formed and held together by the electrostatic forces between the ions. Some examples of ionic compounds include ; Table salt ( NaCl ) , potassium chloride ( KCl )  

Hence we can conclude that the ionic compound from the options listed is )   H₂O₂.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of block = 10 g

volume = final volume of water - initial volume of water

volume = 25 - 20 = 5

volume = 5 mL

The density of the block is

[tex]density = \frac{10}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: A mechanical wave is a disturbance in matter that transfers energy through the matter. A mechanical wave starts when matter is disturbed. A source of energy is needed to disturb matter and start a mechanical wave.

Waves can be given as energy transmission without the net movement of the particles in the medium. The statement for the mechanical wave disturbs the matter is true.

The waves can be differentiated as mechanical, electromagnetic, and matter waves.

The mechanical waves can be described as the waves which are not able to transmit is the energy in the vacuum. Thus, the waves required a matter medium for the propagation of the energy.

The matter propagation results in the disturbance in the matter. Thus, the statement for the mechanical wave has been true.

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Answer:

its ph 8

Explanation:

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of brick = 4 kg

volume = 0.8 L

It's density is

[tex]density = \frac{4}{0.8} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: 6.022×1023

Explanation: Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole is equal to 6.022×1023 molecular entities and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole)

Answer: The Answer is C

An Equal Opportunity Employer will make a hiring decision without considering race, color, religion, sex (including pregnancy), national origin, age, disability, or genetic information.

Explanation:

An Equal Opportunity Employer will  make a hiring decision without considering race, color, religion, sex (including pregnancy), national origin, age, disability, or genetic information.

The employer is an individual or an organization in the government, private, nonprofit, or business sector that hires and pays people for their work. As the authority within an organization, the employer defines the terms of employment for employees and provides the agreed-upon terms which include the salary.

Another way to define an employer is  a person who establishes the culture within an organization. Through their behavior, an employer can send a clear message about how employees should communicate with one each other and how the hierarchy within the organization should operate. For example, some employers encourage a more relaxed work environment, while others prefer a more formal and structured relationship with their employees. The way you interact with your employees should depend on the type of company culture you wish to create.

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Answer:

The warming of the ground (or the oceans) is communicated to the air which, dilated and therefore lighter, begins to rise and cools. Convection clouds appear all the more easily when there is cold air at altitude (unstable air mass).

Explanation:

Answer: Two effects may occur during high current flow: 1) the wire may become overheated to the point that surface oxidation or even evaporation may take place, 2) at the connection points at each end of the wire, especially if the terminations are of a different type of metal than the wire, some atoms may migrate into or out of the wire.

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual density = 0.1478 g/mL

error = 0.1478 - 0.1369 = 0.0109

The percentage error is

[tex]P (\%) = \frac{0.0109}{0.1478} \times 100 \\ = 7.37483085...[/tex]

We have the final answer as

Hope this helps you

Answer:

For (a) the independent variable is what stays constant throughout the whole experiment and the dependent variable is changes in the experiment.

Explanation:

I'm not sure about the other parts, but I hope my explanation for a can get you started :)

Answer:

3.6 times 10^4

Explanation:

Scientific notation is between 1-9. So, we move 36000 to 4 decimal places. SO it would be 3.6 times 10^4. Scientific Notation always has the base of 10 . Enjoy :)

16.32 has the least amount of decimal places

Answer:

16.32

Explanation:

Yes its a larger number however, If you were to move the decimal point to the end of each number then 16.32 would be moved the least.

Answer: During Gregory Mendel’s time, scientist believed:

A. The traits of a child’s parents were blended in the offspring, producing a child with intermediate

characteristics (hybrid)

a. Ex: Giraffe = a cross from a camel and a leopard.

B. Because the eggs are much larger than the sperm, some scientists believed that the female had a greater

influence on the characteristics of the offspring than the male.

Explanation:

Answer:

The cycle of prototyping, testing, and refining that's at the core of iterative design offers numerous benefits: Testing gives you a valuable collection of user feedback that you can use to improve your site and to understand what's working for you. It helps you catch problems before they spiral out of control.

Iteration assists you in detecting problems before they go out of control.

Iteration is a design technique that revolves around a cyclical process of developing, testing, evaluating, and refining a product or process. Changes and adjustments are made based on the outcomes of testing the most current version of a concept.

Iteration, or the cycle of prototyping, testing, and refining that is at the heart of iterative design, has multiple advantages. Testing provides you with a valuable collection of user input that you can use to develop your site and understand what works for you.

Hence, Iteration assists you in detecting problems before they go out of control.

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Answer:

It is called Asterism.

Explanation:

It is Asterism because Asterism refers to a pattern of stars that are seen in night sky and are very distinctive and identifiable. These group of starts have patterns. It visually seen collection of stars and it's indicate their properties and the lines that connect the stars together. It actually range from small shapes of stars to more complex stars that cover segment of the sky. The stars may be bright naked or have similar brightness.

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 7 g

density = 1.33 g/mL

The volume is

[tex]volume = \frac{7}{1.33} \\ = 5.26315789...[/tex]

We have the final answer as

Hope this helps you

Answer:positive

Explanation: because there are more protons than electrons in the ion

Answer:

The mesosphere is 22 miles (35 kilometers) thick. ... Those meteors are burning up in the mesosphere. The meteors make it through the exosphere and thermosphere without much trouble because those layers don't have much air. But when they hit the mesosphere, there are enough gases to cause friction and create heat.

Answer:

Meteoroids urn up in mesosphere because there are a lot of gases that cause friction. Friction causes heat, hence meteoroids burn in mesosphere.

Answer:

a: palladium or Pd

b: arsenic or As

c: magnesium or Mg

d: radon or Rn

e: francium kr Fr

Explanation:

i looked at the periodic table haha

a. The element in group 10 and period 5 is palladium or Pd. b. The element in group 15 and period 4 is arsenic or As.  c. The element in group 2 and period 3 is magnesium or Mg. d. The element in group 18 and period 6 is  radon or Rn. e. The element in group 1 and period 7 is francium or Fr.

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

A substance is considered to be an element if it cannot be reduced to a less complex form. They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.

Each element's atom contains a specific number of protons. For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.

Thus,  The element in group 10 and period 5 is palladium or Pd.

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Answer:

It's The amount of matter within the system remains the same and The cycle has a well-defined starting and stopping point.

Explanation:

Answer:  Plato users the correct answer is C but not E

Explanation:   I just took the test.  Hope you do better than I did in finding the correct second answer