The following table lists the number of protons, neutrons, and electrons in several different atoms. Which two
atoms are the same element?
Atoms
# Protons
# Neutrons
# Electrons
A
12
12
11
B
13
12
12
C
13
13
13
D
14
13
13

Answer:

Electron shielding is when the inner electrons shield the outer electrons from the full force of the nucleus

Answer:

Explanation:

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

[tex]n = \frac{N}{L} \\[/tex]

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 we have

[tex]n = \frac{2.3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.3}{6.02} \\ = 0.382059...[/tex]

We have the final answer as

Hope this helps you

Answer:

C

Explanation:

You can eliminate A and D because hand warmers are a chemical reaction. And C is the best answer because heat is released.

Answer:

I belive its liquid if I'm right because liquids are packed together when they take shape but they are still able to move.....brainliest???

Answer:

Liquid

Explanation:

Please don't jugde me if I got it wrong

Answer: E

Explanation:

Answer:

D

Explanation:

When you mix a strong acid and a strong base : ( D ) You will wind up with a pH-neutral salt and water

The mixture of a strong base and an equally strong acid results in a neutralization reaction, because at the point of equivalence the base and acid will completely neutralize each other.

The mixture solution will have a pH value of 7 and the end products will an ionic salt and water.

Hence we can conclude that When you mix a strong acid and a strong base , you will wind up with a pH-neutral salt and water.

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Answer:

They hatch into larvae.

Explanation:

Answer:

Less

Explanation: I took the test.

Answer: negative ions have less protons than electrons.

Explanation:

Answer:

1. Metals

2. Solid, gas, liquid

Explanation:

For #1:

The majority of elements in the periodic table are classified as metals. The transition metals lie in the center of the table, spanning groups three through 12. These elements are solid at room temperature, except mercury, and have the metallic color and malleability expected of metals.

Hope this helps :)

Answer:

A

Explanation:

Answer:

2.7g/cm³

Explanation:

Given parameters:

Dimension of the aluminum  = 10.5cm x 10.5cm x 0.1cm

Mass of the aluminum  = 29.8g

Unknown:

Density  = ?

Solution:

Density of a substance is its mass per unit volume;

  Mathematically;

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

Volume of the aluminum  = 10.5cm x 10.5cm x 0.1cm = 11.025cm³

  So, insert the parameters and solve;

  Density  = [tex]\frac{29.8}{11.025}[/tex]   = 2.7g/cm³

Answer:

The real answer for a is-He(helium)4,002602

The answer for b is-Mg(Magnesium) 24.305

Answer: $46.98

Explanation:

The distance to drive to Los Angeles from San Francisco is 405 miles. Since the car get 25 miles per gallon of gas, for 405 miles, the car will use:

= 405/25 = 16.2 gallons

Since the cost of gasoline is $2.90 a gallon and the car will use 16.2 gallons. The cost will be:

= $2.90 × 16.2 gallons

= $46.98

Answer:

Explanation:

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

[tex]n = \frac{N}{L} \\ [/tex]

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 we have

[tex]n = \frac{4.88 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{4.88}{6.02} \\ = 0.810631229...[/tex]

We have the final answer as

Hope this helps you

The average atomic mass of a sample closer to the mass of Li-6

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.  

So Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu  

Mass atom X = mass isotope 1 . % + mass isotope 2.%  

three Li-6, mass number = 6

two Li-7, mass number = 7

total abundance = 5

abundance for Li-6 =

[tex]\tt \dfrac{3}{5}\times 100\5=60\%[/tex]

abundance for Li-7 =

[tex]\tt \dfrac{2}{5}\times 100\5=40\%[/tex]

Average atomic mass :

[tex]\tt (0.6\times 6)+(0.4\times 7)=6.4[/tex]

Explanation:

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Answer:

See explanation

Explanation:

1. The Ketone was not sown in the question but i can give you a general idea of how to calculate its molecular weight. A ketone has a general molecular formula of CnH₂nO.

The molecular weight is calculated knowing that the relative atomic mass of carbon is 12, that of hydrogen is 1 while that of oxygen is 16.

Hence from the general molecular formula, the molecular weight of any ketone is calculated from; n(12) + 2n(1) + 16. Where n represents the number of atoms of each element in the ketone.

2. Sublimation of dry ice occurs when the molecules in dry ice absorb sufficient energy in the form of heat such that they now have enough energy for some molecules to overcome the inter molecular forces acting in the solid crystal and transform directly into the vapor phase. This process is endothermic.

3.  

cyclohexane and CH2Cl2 molecules are held together by dispersion forces.

CH3CH2OCH2CH3 and  CH3CN are polar molecules held together by  dipole-dipole forces.

Answer:A

Explanation:just casuse

Answer:

Add a coefficient of 3 in front of the 02 to balance the 6 O atoms in the products

Explanation:

Add a coefficient of 3 in front of the 02 to balance the 6 O atoms in the products

Answer: C because I’m smart

Explanation:

The Lymph nodes have been consisted of the lymph fluid that has been able to entrap the bacteria and kill them. Thus, option C is correct.

Lymph nodes have been defined as the small swellings in the lymphatic system that has been consisting of the various parts of the body.

The lymph nodes have consisted in the neck, armpit, chest and abdominal region of the body and have been able to perform the function as the first layer of defense.

The Lymph nodes have been consisted of the lymph fluid that has been able to entrap the bacteria and kill them. Thus, option C is correct.

For more information about the lymph nodes, refer to the link:

https://brainly.com/question/529683

Answer:

The answer is Radiation

Answer:

Convectional

Explanation:

It is the movement of heat through fluid

While radiation travels though a vacuum and conduction accrues between atoms / solids

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Answer:

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 we have

[tex]volume = \frac{50}{0.785} \\ = 63.694267...[/tex]

We have the final answer as

Hope this helps you

Answer:

i think that the answer is B

Explanation:

If a student wants to investigate competition between two organisms in an ecosystem the organisms should have same adaptations and use same resources.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

Learn more about ecosystem,here:

https://brainly.com/question/1061425

#SPJ2

Answer:

Mass = 33.515 g

Explanation:

Given data:

Volume of ammonia = 45.0 L

Temperature = 57.0°C (57 +273 = 330 K)

Pressure = 900 mmHg

Mass of ammonia = ?

Solution:

Formula:

PV = nRT

We will use R = 62.364 (L * mmHg)/(mol * K) because pressure is given in mmHg.

900 mmHg × 45.0 L = n × 62.364L * mmHg/mol * K × 330 K

40500 mmHg.L = n ×  20580.12L * mmHg/mol

n= 40500 mmHg.L/ 20580.12L * mmHg/mol

n = 1.9679 mol

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 1.9679 mol × 17.031 g/mol

Mass = 33.515 g

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

Answer:

D .The particles of matter are arranged in different ways for the different state.

Explanation:

The kinetic molecular theory is used to explain the forces between molecules and the energy the molecules possesses.

One of the key postulate of this theory is that;

Therefore, we can see that the particles of matter are arranged in different ways for different state.

Answer:

Hope this helps! maybe mark me brainliest?

Explanation:

Answer:

Explanation:

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

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

From the question we have

[tex]density = \frac{2.78}{10} \\ = 0.278[/tex]

We have the final answer as

Hope this helps you

Answer:

p = 0.278 g/cm3

Explanation: