What’s the biggest molecule

Answer:

its called either a physical change or chemical change

Explanation:

Answer:

C₅H₁₂

Explanation:

Using general law of gases we can determine the moles of the sample and, as we know the mass the molecular formula is the ratio between mass in grams per mole of susbtance. With this, we can find the molecular formula, thus:

Moles:

PV = nRT -General gas law-

Where P is pressure: 741mmHg * (1atm / 760mmHg) = 0.975atm

V is volume in liters: 672.0mL = 0.672L

n are moles -Our incognite-

R is gas constant: 0.0821atmL/molK

And T is absolute temperature: 273.15 + 35°C = 308.15K

Replacing:

n = PV/RT

n = 0.975atm*0.672L / 0.0821atmL/molK*308.15K

n = 0.0259moles

And molar mass is:

1.87g / 0.0259moles =

72.2g/mol.

In 72.2g/mol we can have just 5 moles of C:

5 moles of C will weigh: 12.01g/mol * 5 = 60.05g/mol

And the other mass must come from hydrogen:

72.2g/mol - 60.05g/mol = 12.15g/mol / 1.01g/mol = 12 moles of hydrogen

And molecular formula is:

Answer:

The production of bubbles indicates that a new substance formed

Explanation:

A chemical change is characterized by the following:

i) A new substance is formed

ii) It is not easily reversible

iii) Heat is evolved

When Vinegar and baking soda are mixed, a gas is evolved. The evolution of a gas indicates that a new substance has been formed, hence a chemical change has taken place.

Answer:

B

Explanation:

edge 2020

Answer:

See explanation

Explanation:

There are four sets of quantum numbers, they are;

1) Principal quantum number (n): The values of the principal quantum number ranges from 1 - ∞.

2) Subsidiary/azimuthal/orbital quantum number (l): The values of this set of quantum number ranges from 0-3 corresponding to s, p, d, f.

3) Magnetic quantum number (m): The values of the magnetic quantum number ranges from -l to +l.

4) Spin quantum number (ms): The values of spin quantum number are; -1/2 and +1/2

Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.

Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.

When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.

One sodium and fluorine each totaling 2 atoms are enough to make the bond.

As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.

The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.

The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.

The name of the compound is sodium fluoride with formula NaF.

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Answer:

3.57 mg

Explanation:

The following data were obtained from the question:

Half life (t½) = 12.3 years

Original amount (N₀) = 57.0 mg

Time (t) = 49.2 years

Amount remaining (N) =?

Next, we shall determine the rate of disintegration. This can be obtained as follow:

Half life (t½) = 12.3 years

Decay constant (K) =.?

K = 0.693 / t½

K = 0.693 / 12.3

K = 0.0563 /year

Finally, we shall determine the amount remaining after 49.2 years as shown below:

Original amount (N₀) = 57.0 mg

Time (t) = 49.2 years

Decay constant (K) = 0.0563 /year

Amount remaining (N) =?

Log (N₀/N) = kt / 2.303

Log (57/N) = (0.0563 × 49.2) / 2.303

Log (57/N) = 2.76996 / 2.303

Log (57/N) = 1.2028

Take the anti log of 1.2028

(57/N) = anti log (1.2028)

57/N = 15.95

Cross multiply

57 = N × 15.95

Divide both side by 15.95

N = 57 / 15.95

N = 3.57 mg

Thus, 3.57 mg of the nuclide will be remaining after 49.2 years.

Why’d you put chemistry as the subject for a question about mood? What’s the excerpt? What’s the choices in the drop down list?

Answer:

mysterious

Explanation:

took test

Answer:

Glass Hazard

Explanation:

Answer:

Intensive property

Explanation:

The melting point of a substance is the temperature at which a solid metal changes to liquid.

At this stage, the particles of the solid would have gained sufficient energy to break away from the well ordered lattice configuration and they begin to behave like liquids.

An extensive property changes as the mass of the body changes.

Answer:

Explanation:

Rusting of iron occurs during the reaction of iron and oxygen in the presence of moisture to form hydrous iron (III) oxide, which is a reddish brown substance.

By virtue of this, the atoms which are reactants in the redox reaction would e oxygen and iron.

I hope this was clear and easy to understand.

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an element

a compound

Answer:

its actually 18 so you dont have to feel lucky

Explanation:

ywy

Answer:

Greenhouse gases

Explanation:

They are what causes climate change and affects the ozone layer.

Answer:

Oxygen travels to insect tissues through tiny openings in the body walls called spiracles, and then through tiny blind-ended, air-filled tubes called tracheae.

The structure in insects that allows oxygen to diffuse into their body is the spiracle.

Insects are animals that belong to the class Insecta in the phylum Arthropoda. They have a segmented body that is divided into 3 majors parts:

In addition, insects have jointed appendages and an exoskeleton made largely of chitinous proteins.

Gaseous exchange in insects is tracheal. The trachea is a network of tubes that lead to openings in the body of insects known as spiracles. In other words, air enters through the spiracle and connects to the trachea tubes where gaseous exchange occurs.

More on gaseous exchange in insects can be found here: https://brainly.com/question/21538375

Answer:

i think ur right

Explanation:

The study of chemicals is called chemistry.

The correct answer is [tex]2*10^{-7}[/tex]

All the data is given in the question, the data is as follows:-

The formula that will be used in the question is as follows:-

[tex]Wavelength=\frac{c}{v},[/tex]

After putting the value, the wavelength is as follows:-

W[tex]=\frac{3 * 10^8}{1.5 * 10^{15}}[/tex]

The W=[tex]2 * 10^{-7[/tex]

For more information, refer to the link:-

https://brainly.com/question/25305623

Answer: the answer is A

Explanation:

well I just know

Answer:

This means that if a gas is heated up and the pressure does not change, the volume will. So for a fixed mass of gas at a constant pressure, volume ÷ temperature remains the same. The volume of a gas rises as its temperature is raised Balloons shrink when placed inside a beaker of cold liquid nitrogen

Explanation:

Answer: Amount, if the number of particles and the temperature are constant, is inversely proportional to strain. As the volume increases, there are two options for the strain to stay the same. ... In other words , the number of particles is equal to the volume if temperature and pressure are constant.

Answer:

the answer is D

Explanation:

If you're talking about organic and inorganic compounds, they are all classified under one.

However, if you're talking about ionic and covalent compounds, they can be classified under them.

Carbon dioxide: Covalent

I believe you're talking about ChL, which could be considered a chemical compound or covalent.

NaCi does not exist. However, if you're talking about NaCl, which DOES exist, it is ionic.

Ci does not exist, but if it's Cl, once again, covalent.

Henceforth, I have no context. ChL OR NaCl could be considered the answer.

Why ChL? Chemical.

Why NaCl? It is the odd one out and ionic bonds are often considered a compound different from others.

Answer:

Answer Below

Explanation:

Geographers use maps and global positioning systems in their work. Geographers study the Earth and the distribution of its land, features, and inhabitants. They also examine political or cultural structures and study the physical and human geographic characteristics of regions ranging in scale from local to global.

answer:

a geographer uses maps and global positioning systems in their work to study the earth and the distribution of its land & features & inhabitants and to examine political or cultural structures ranging in scale from local to global.

explanation:

that's the role of a geographer ​

i answered your question & hope you have a great day!

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The simple awnser is that it dissolved.

Answer:

alkaline earth metals

Explanation:

group 2A elements are the alkaline earth metals they have two electrons in the outermost energy level because their electron consideration ends in s2. you can add me and I'll help more please give me Brandy is I'm trying to move up I need two more to move up and I'll help you anytime I can

Answer:

Strontium

Explanation:

Elements are classified into groups and periods. Elements that are grouped together in the same group are said to have the same number of valence electrons, hence, they behave the same way chemically. This is the case of Calcium which reacts with Chlorine to form CaCl2. Calcium belongs to Group II in the periodic table, hence, possesses two valence electrons which it transfers to chlorine atoms.

Strontium (Sr) will behave the same way like Calcium because they belong to the same group in the periodic table, meaning that they both have two valence electrons, which they'll transfer. Strontium will form compound SrCl2 with Chlorine.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question we have

force = 1500 × 5

We have the final answer as

Hope this helps you