what is the significant figures of 12.00

Answer:

Your lungs deliver oxygen and remove carbon dioxide from your blood in a process called gas exchange. Gas exchange happens in the capillaries surrounding the alveoli, where the oxygen that is breathed in enters the circulatory system and carbon dioxide in the blood is released to the lungs and then breathed out.

A few important ones........

Answer:

The molecular formula of a compound may be the empirical formula, or it may be a multiple of the empirical formula. For example, the molecular formula of butene, C4H8, shows that each freely existing molecule of butene contains four atoms of carbon and eight atoms of hydrogen. Its empirical formula is CH2.

Explanation:

Answer:

The Earth rotates on its axis at a constant tilt.

Earths rotation on its axis at a constant tilt provides seasonal changes in the different part of the country. This resulted to the distribution of the heat of the sun from northern hemisphere and to southern hemisphere. Making areas with hot temperature may experience rainy season in a year. This will help production of crops or food supply and water supply available for living organism.

If the Earth's rotation is not tilted, then both the northern hemisphere and southern hemisphere will be covered with thick ice sheet. The equatorial region or near the equatorial region will experience tremendous warm temperature. Making our life on Earth not ideal for living.

Magnetic Field

Earth is protected by the magnetic from the dangerous radiation coming from the heat of the sun.

Water and oxygen

These two elements are essential for living organism in order to survive. The existence of waters proves that Earth temperature is conducive for living.

Answer:

E.) 1s^22s^22p^23s^4p^4

Explanation:

Answer:

See explanation.

Explanation:

D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d8;

Explanation: before filling 3d orbitals, 4s needs to be filled. Since s holds 2 electrons, take two from the 3d10.

E. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p3;

Explanation: after the 4s orbital, the 3d orbitals need to be filled. You do not fill the 4d orbitals until the 5s orbital is filled.

Here is a quick review of the order orbitals need to be filled in:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p;

s holds 2 electrons; p holds 6 electrons; d holds 10 electrons; f holds 14 electrons.

Answer:

liquid, solid, gas

Explanation:

Solid, Liquid and gaseous

There are 5 states of matter

1.) Solid

2.) Liquid

3.) Gaseous

4.) Plasma

5.) Bose Einstein

the First three are main

Answer:

So if you divide the kg of butter and the cake that will be your answer and then you should have a fraction so the fraction would be 0.25 over 2 because you simplified it. 0.25/2

Explanation:

Answer:

here is your answer

Explanation:

1. sodium sodium is very reactive metal

2. when it exposed in air it automatically form Na2O.

3. when when it put in water it reacts visoroustly and start burning on water.

( due to this it is called active element)

Explanation:

When the forces acting on an object are balanced , there is no change in the object's motion.

A force acting on a resting object can cause the object to move.

On Earth, gravity pulls all objects toward the ground.

When a force acts in the opposite direction of another force, the forces counteract each other.

More than one force acting on a falling object can reduce its downward acceleration

Air resistance is caused by molecules of air pushing against a moving object

Answer:

The rubber becomes brittle and can break in your hand. The explanation for why this happens concerns cross-linking bonds. Ultra-violet light from the sun provides the polymer molecules with the activation energy they need to be able to form more cross-links with other chains.

Answer:

0.15066667

I tried, hope this helps :)

Answer:j

Explanation:im not stupid??

Answer:

2

Explanation:

student 2 is correct because the number of protons determines what element an atom is, and the number of valence electrons shows how the atom bonds and its reactivity.

Answer:

there is no following so there isnt a answer

Explanation:

I'm assuming you're talking about atomic radius. It'd be the 2nd.

Fluoride has the smallest (group 17)

Oxygen has the 2nd smallest (group 16)

Sodium has the largest (group 1)

Sorry it took so long, didn't know it was multiple choice :)

Answer:

8.4 m/s

Explanation:

Initial velocity of the object is 0 as it was at rest.

We need to find the object’s average velocity during the 3 second to 5 second.

We can see from the graph that from 3 s to 5 s, the graph is a straight line. If we take the slope we can find the average velocity during the 3 second to 5 second.

Displacement between 3 s to 5 s is :

D = 24.8 m - 8 m = 16.8 m

Time = 5 s - 3 s = 2 s

Now,

Average velocity,

[tex]v=\dfrac{\Delta y}{\Delta x}\\\\y=\dfrac{16.8\ m}{2\ m}\\\\y=8.4\ m[/tex]

So, the object’s average velocity during the 3 second to 5 second is 8.4 m/s.

Answer:

Explanation:

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

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

From the question

mass = 70 g

volume = 10 mL

We have

[tex]density = \frac{70}{10} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

I will assume that you mean

STP (Standard Temperature and Pressure)

21

3

≈

7 L

Explanation:

Since we know that

1 mole

of an ideal gas occupies

22.4 L

at

STP

then can establish the following relationships:

22.4 L

1 mole

or

1 mole

22.4 L

Knowing that, we can solve for the volume occupied by the helium gas,

0.35

mole

1

⋅

22.4 L

1

mole

=

7.84 L

as

7.84 L

−

−

−

−

−

The answer makes sense because if

1 mole

occupies

22.4 L

, then

0.35 moles

(roughly a third of the moles) will occupy a third of

22.4 L

(

if we round down 22.4 L to 21 L

)

−

−

−

21

3

≈

7 L

The volume occupied by 0.34 moles of Helium Gas is 7.62 L.

Any gas from the  group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates. — called also inert gas.

They have properties tending to an ideal gas.

It is asked that what volume will be occupied by  0.34 moles Helium Gas

The ideal gas equation is written as

PV = nRT

At STP , T = 273 K

P= 1atm

R = 0.0821 L(atm) mol⁻¹K⁻¹

Substituting the values

1 * V = 0.34 * 0.0821 * 273

V = 7.62 L

Therefore the volume occupied by 0.34 moles of Helium Gas is 7.62 L.

To know more about Noble Gas

https://brainly.com/question/2094768

#SPJ5

Answer:

A

Explanation:

An atom that is a different isotope of a given element would contain 6 protons, 7 neutrons, and 6 electrons. Therefore, option (A) is correct.

Isotopes are atoms of an element that contain the same atomic number as the original element but a different atomic mass. Isotopes of an element possess the same number of electrons and the number of protons but different numbers of neutrons in their respective nucleus.

For example, the isotopes of carbon are carbon-14, carbon-13, and carbon-12. Carbon-14 has a total of 8 neutrons, carbon-13 have a total of 7 neutrons, and carbon-12 has a total of 6 neutrons. So all the isotopes of carbon have different numbers of neutrons.

Given element has 6 protons, 6 neutrons, and 6 electrons. So the isotope of this element will have  6 protons, and 6 electrons but not 6 neutrons. Therefore, the element with 6 protons, 7 neutrons, and 6 electrons is the isotope of the given element.

Learn more about isotopes, here:

brainly.com/question/11680817

#SPJ2

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 = 0.7988 g/mL

error = 0.7988 - 0.7925 = 0.0063

So we have

[tex]P(\%) = \frac{0.0063}{0.7988} \times 100 \\ = 0.788683024...[/tex]

We have the final answer as

Hope this helps you

Answer:

AgCN

Explanation:

Ag+C=N

Answer:

It poisons animals, it coats reefs, and damages ecosystems.

Explanation:

It is the same principle with humans. If we drink oil ( the actual stuff from for example, Spindletop) we would get poisoned, and die. If we eat toothpaste over and over, we have to go to poison control so they can pump your stomach. If we drink cyanide, we will die. If we get poison in our food, we will either starve, try to fix it, or we get poisoned and die. If we were some fish, we might not be able to fix the water, so we starve, or we get poisoned.

It is the same lines as the animals, our pollution and oil floods our environment and we start to die.

Sponsered by: STAF

Save the Animals Foundation

Hope this helps!

I was kidding about the sponsership.

Answer:It is the same principle with humans. If we drink oil ( the actual stuff from for example, Spindletop) we would get poisoned, and die. If we eat toothpaste over and over, we have to go to poison control so they can pump your stomach. If we drink cyanide, we will die. If we get poison in our food, we will either starve, try to fix it, or we get poisoned and die. If we were some fish, we might not be able to fix the water, so we starve, or we get poisoned.It is the same lines as the animals, our pollution and oil floods our environment and we start to die.

Explanation:

Answer:

The answer is A. Construction. The production of raw materials for construction in factories is harmful for the environment due to CO2 emissions. The chemicals used in construction and the diesel used by construction vehicles are also harmful to the environment.

Explanation:

In an ecosystem , human activity which constitutes to air pollution is construction.

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 ecosystem 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.There are different types of ecosystems.

Learn more about ecosystem,here:

https://brainly.com/question/19267717

#SPJ6

Answer:

Explanation

In the Bohr model of the atom, electrons travel in defined circular orbits around the nucleus. The orbits are labeled by an integer, the quantum number n. Electrons can jump from one orbit to another by emitting or absorbing energy.

Answer:

colloid

Explanation:

i think she making meth in her basement

Answer:

B. stored energy

hope this helps!!

if an electron is passed from Ago B then Slides electrons which makes it electropositive i.e A+

According to the redox reactions , when an electron is transferred from A to B , B molecule has been reduced as it gains electrons.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

Learn more about redox reactions,here:

https://brainly.com/question/13293425

#SPJ2