3. According to Newton's First Law of Motion, what does an object at rest do?
stays at rest
begins to move
cannot be moved
continues to move

Answer:

Noble gases are called "safe" gases because they are inert.

General Formulas and Concepts:

Explanation:

Because Noble Gases have filled their outer shell electrons fully, they tend not to form compounds with other elements or react with others to produce another compound.

Take Ne (neon) for instance. It's electron configuration is 1s²2s²2p⁶. The outer most shell is the 2p sublevel, and according quantum numbers, the 2p sublevel only has 3 spaces for 2 electrons each that it can hold. Therefore, Ne has a full outer shell and no electron spots to create a bond with other elements.

Answer: any non-living thing

Explanation: abiotic means non-living

The Abiotic observation that the ecologist would record are ;

Abiotic factors in ecosystem are the non-living factors that play an essential role in determining how an ecosystem is different from other ecosystems. Some of the Abiotic factors that will distinguish ecosystems in the rainforest biome include ;

Hence we can conclude that The Abiotic factors/observation that the ecologist would record are ; Soil type, Climate , Precipitation and Sunlight

The options to your question are missing hence a general answer is provided above

Learn more : https://brainly.com/question/15332646

Answer:

Explanation:

We're asked to calculate the number of atoms of

Ca

in

153

g Ca

.

What we must first do is convert the given mass of calcium to moles of calcium, using its molar mass (referring to a periodic table, this is

40.08

g

mol

):

153

g Ca

(

1

mol Ca

40.08

g Ca

)

=

3.82

mol Ca

Using Avogadro's number,

6.022

×

10

23

particles

mol

, we can calculate the number of atoms present:

3.82

mol Ca

(

6.022

×

10

23

atoms Ca

1

mol Ca

)

=

2.30

×

10

24

atoms Ca

Answer:

D) NaNO3 at 10 °C

Explanation:

In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.

As you can see in the curve attached, let's analyze first what is an unsaturated solution.

An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends on the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.

As you can see in the graph attached, what happens to the KCl? we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.

If you watch NaCl, has similar behavior. You just need about 35 g of solute to be saturated.

Finally, the KNO₃ just need 60 g of solute to be dissolved in the solution, completely.

In the case of NaNO 10°C, we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.

Explanation:

Answer:

D

Explanation:

ap

The statement that best describes the reaction [tex]\rm H_2(g) + Cl_2(g) \rightarrow 2HCl(9), AH = -184.6[/tex] is the reaction has no activation energy.

Activation energy is the small amount of energy which is required to start a reaction.

This is the kinetic energy of the reactant molecules, which helps them to collide.

High activation energy means the reaction will be slow.

Low activation energy means a high rate of energy.

Thus, the correct option is B.

Learn more about activation energy

https://brainly.com/question/11334504

Answer:

1. A

2. C

Explanation:

Answer:

there are 3 elements in question 1 and 4 atoms in question 2

Explanation:

Explanation:

Density of object = gram/volume

= 100 g/ 5 cm³

= 20 g/cm³

The density of an object that is 100 grams and has a volume of 5 cubic centimeters is 20 g/cm³.

Density of any object will be calculated by using the below equation:

ρ = m/V, where

m = mass of object = 100g

V = volume of object = 5 cm³

On putting values we get,

ρ = 100/5 = 20 g/cm³

Hence required density is 20 g/cm³.

To know more density, visit the below link:

https://brainly.com/question/6838128

The percentage yield of the reaction : 25%

C₂H₃NaO₂(CH₃COONa)- Sodium ethanoate(MW=82,0343 g/mol)

Reaction

CH₃COONa + NaOH⇒CH₄+Na₂CO₃

mol CH₃COONa :

[tex]\tt \dfrac{8.2}{82.0343}=0.1[/tex]

mol CH₄=mol CH₃COONa = 0.1

mass CH₄ (MW=16.04 g/mol) :

[tex]\tt 0.1\times 16.04=1.604~g[/tex]⇒ theoretical

mol of 560 cm³(0.56 L) of methane (⇒1 mol = 22.4 L at STP) :

[tex]\tt \dfrac{0.56}{22.4}=0.025~mol[/tex]

mass  CH₄ :

[tex]\tt 0.025\times 16.04=0.401~g[/tex]

[tex]\tt \%yield=\dfrac{0.401}{1.604}\times 100\%=25\%[/tex]

Answer:

For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

Explanation:

Make sure to edit so you do get copy-writed

Answer:

Waste incineration is one of many societal applications of combustion. ... Municipal solid-waste furnace designs have evolved over the years from ... To achieve complete combustion, gases produced must remain in the ... do not suffer rapping re-entrainment and dust layer back-corona problems associated with dry ESPs.

Explanation:

Answer:

The beginning

Explanation:

In a nuclear reaction, the  rate of decay is fastest at the beginning of the process.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

Learn more about nuclear reactions,here:

https://brainly.com/question/12649087

#SPJ2

Answer:

Explanation:

D. Se2−

Selenium is in Group 16 of the periodic table, and it typically has 6 valence electrons. To achieve a stable set of valence electrons, it will either try to gain two more electrons to form Se²⁻or lose six electrons to form Se⁶⁺. Therefore, the correct option is option D.

An ion is an atom or a molecule that has gained or lost one or more electrons, resulting in an unequal number of protons and electrons. When an atom gains electrons, it becomes negatively charged and is called an anion. Conversely, when an atom loses electrons, it becomes positively charged and is called a cation.

Ions play a crucial role in chemical reactions and the formation of chemical compounds, as they are attracted to one another based on their opposite charges. This process helps stabilize the electron configuration and achieve a more stable, lower-energy state.

Thus, the ideal selection is option D.

Learn more about Ions, here:

https://brainly.com/question/30663970

#SPJ6

Answer:

The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium. ... All four of these electrons are counted in both the carbon octet and the oxygen octet, so that both atoms are considered to obey the octet rule.

I actually do not know the answer can I help tommorow if you are fine with it tooo sleeeepy have 14 exams tommorow have to prepare.

Sorry:(

Answer:

Chlorine

Explanation:

Since chlorine is above bromine in the periodic table, following the trends of ionization energy in the periodic, the further up you go the more energy is required to ionize an atom.  

Answer:

The gallbladder is a pear-shaped, hollow structure located under the liver and on the right side of the abdomen. Its primary function is to store and concentrate bile, a yellow-brown digestive enzyme produced by the liver. The gallbladder is part of the biliary tract

Answer:

a.............................

Answer: The empirical formula is [tex]C_3NH_5O[/tex].

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 50.69 g

Mass of N= 19.71 g

Mass of H = 7.09 g

Mass of O = 22.51 g

Step 1 : convert given masses into moles.

Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{50.69g}{12g/mole}=4.22moles[/tex]

Moles of N=[tex]\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{19.71g}{14g/mole}=1.41moles[/tex]

Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{7.09g}{1g/mole}=7.09moles[/tex]

Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{22.51g}{16g/mole}=1.41moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =[tex]\frac{4.22}{1.41}=3[/tex]

For N = [tex]\frac{1.41}{1.41}=1[/tex]

For H = [tex]\frac{7.09}{1.41}=5[/tex]

For O =[tex]\frac{1.41}{1.41}=1[/tex]

The ratio of C:N:H: O = 3:1:5:1

Hence the empirical formula is [tex]C_3NH_5O[/tex].

adaptation may be i guess

Answer:

Relative atomic mass  = 24.32 amu.

Explanation:

Given data:

Relative atomic mass of Mg = ?

Abundance of Mg-24 = 79.0%

Abundance of Mg-25 = 10.0%

Abundance of Mg-26 = 11.0%

Solution:

Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) +  (abundance of 3rd isotope × its atomic mass)  / 100

Relative atomic mass  = (79.0×24)+(10.0×25) +(11.0×26) /100

Relative atomic mass =  1896 + 250 + 286 / 100

Relative atomic mass  = 2432 / 100

Relative atomic mass  = 24.32 amu.

Answer:

no

Explanation:

Answer:

The answer is B

Answer:

This is man made and natural

Answer:

yeah its newton's third law

Explanation:

Answer:

The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. ... Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors

Explanation:

i have advancedddd

Answer:

?

Explanation:

Answer:

hydrogen, nitrogen, oxygen, aluminium are elements

salt, sugar, tomato sauce, cake batter, salty water are mixtures

Explanation:

all the elements in the group halogens in the periodic table are compounds.

Answer:

Dark Blue: Symbolizes integrity, knowledge, power, and seriousness. Blue: Peace, tranquility, cold, calm, stability, harmony, unity, trust, truth, confidence, conservatism, security, cleanliness, order, loyalty, sky, water, technology, depression, appetite suppressant.

Answer:

See explanation

Explanation:

Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.

O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.

Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.

P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.

S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.

Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.

Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.

Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.

Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.

Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.

As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.

I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.

Answer:

see the pic for the answer