Which is the correct answer?

Answer:

substance

Explanation:

A pure substance is a form of matter that has a constant composition (meaning it's the same everywhere) and properties that are constant throughout the sample (meaning there is only one set of properties such as melting point, color, boiling point, etc

Answer:

1.79 moles

Explanation:

1.79 moles

1.79 moles

1.79 moles

1.79 moles

Answer:1.79 moles

1.79 moles are there in 100g of iron.

Explanation:

thats the answer for it

Explanation:

C9H2O + 14O2 → 9CO2 + 10H2O

a. How many molecules of nonane will burn in a tank that has 770 mL of oxygen at STP?

From the reaction;

1 mol of nonane reacts with 14 mol of Oxygen

At STP, 1 mol = 22.4 L

Converting 770 ml (0.77 L) to mol;

1 = 22.4

x = 0.77

x = 0.77 / 22.4 = 0.034375 mol

Back to the equation;

1 mol = 14 mol

x mol = 0.034375 mol

Solving for x;

x = 0.034375 * 1 / 14

x = 0.00245535714 mol

1 mol = 6.022 * 10^23 molecules

0.00245535714 mol = x

Solving for x;

x = 0.00245535714 * 6.022 * 10^23

x = 1.4786 * 10^21 molecules

b. If the container were heated to 78O C before the combustion, what would the pressure be?

Initial Pressure P1 = ?

Initial Temperature T1 = 780 +273 = 1053 K

Final Temperature (STP) T2 = 273 K

Final Pressure (STP) P2 = 1 atm

Using gay lusaac's law;

P1 / T1  =  P2 / T2

Inserting the values;

P1 = T1 * P2 / T2

P1 = 1053 * 1 / 273

P1 = 3.857 atm

Answer:

due to the law of conservation of mass, the mass would stay the same.

Answer:

Atomic size decreases on going along a period from left to right because the electron enters into the same shell, therefore, attraction between nucleus and outermost electron increases and thus atomic size decreases. Valency first increases from 1 to 4 and then decreases from 4 to GO along a period from left to right.

Answer:

kha gya vo chasmis ........

Answer:

The mass number

Explanation:

The mass number of an atom is its total number of protons and neutrons.

I hope this helps a bit.

Answer:

16

Explanation:

Answer:

16 hopes this will help you

Explanation:

16 hope this helps

Answer:

three atoms = 1 water molecule

3 × 6 = 18 atoms

................

Answer:

Product

Explanation:

Honestly I’m just guessing based on the fact it’s simplified and doesn’t have a really long chemical equation.

Answer:

When you place an iron nail in a basin of water and leave it for two days, what will happen to the iron nail? It will form rust on the surface of the nail. Rust forms when iron combines with oxygen to form iron oxide.

Explanation:

Assuming they were clean of rust to begin with, and are made of an ordinary steel - they start to rust - will turn orange, and the orange sediment...

Not much if any while it's in the water for that period of time. However once you remove it then it will be exposed two oxygen and will start to ox...

If it is not coated properly It will form Rust .

Answer:

You will need to have a red flower in the top left, a pink flower in the top right and bottom left, and a white flower in the bottom right.

Explanation:

This flower appears to express color through codominance, which means that both genes express themselves. "R" is the dominant gene for red, and "r" is the recessive gene for white. When a flower has RR genotype, the phenotype will be a red flower. When a flower has an Rr genotype, the red and white genes will both be expressed and the phenotype will be pink. When a flower has an rr genotype, it lacks the red gene and will therefore be only white.

Answer:

False

Explanation:

Answer:

true

Explanation:

i dont know if you want more info on how it is true just tell me if you do and i will add it in

Answer:

The cell goes through the cell cycle/mitosis

Explanation:

The cell cycle is basically the process of dividing

G1 phase is where the cell grows in size, and make sure that everything is ready to divide.

Synthesis or the S phase is where the cell copies its DNA.

G2 phase is where the cells check that all its DNA has been correctly copied.

Mitosis or M phase, where the cell finally divides in two. If the cells keep on dividing exponentially, they will become billions of cells.

Explanation:

Equiv means equivalent ...

Answer:

-15-12-14=-13

Explanation:

we simplify by opening the bracket

Answer:

endothermic

Explanation:

Because the value of the heat of reaction is positive .

Answer:

conductors of electricity when in liquid or aqueous state

high melting point

soluble in water

Explanation:

An ionic substance is any substance that is composed of two ions of opposite charge.

In the solid state, ionic substances do not conduct electricity because the ions are trapped inside the crystal. When in liquid state or in aqueous solution, these ions are now free and the solution becomes an electrolyte.

All ionic substances have a very high melting point and dissolve in water easily.

Answer:

A violent reaction will occur and zinc sulphide is formed as a product

Answer:

pH strips and written observations of stream water

Explanation:

Answer:

concave

Explanation:

Answer:

I think it is either a or b

Explanation:

c or d has the correct names and Roman numerals.

Answer:

2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

Explanation:

Answer: 2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

reaction type: Double Displacement

Answer:

Steel and cast iron

Explanation:

They are all metal but assuming that you are finding the best material for your pan i suggest going for steel or cast iron

Answer:

The main difference between Mendeleev and Modern Periodic Table is that Mendeleev’s periodic table orders the elements based on their atomic mass whereas Modern periodic table orders the elements based on their atomic number.

Explanation:

Answer:

calcium is the correct answer :)

Answer:

physical- torn paper, coloring leaves in a coloring book

chemical- burned paper, leaves turning colors during fall and winter

Explanation:

Answer:the answer is a

Explanation:

The density of a gas at standard temperature and pressure conditions is 1.40 grams per liter.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.These values are important to physicists, chemists ,engineers ,pilots and navigators.

Learn more about standard temperature and pressure,here:

https://brainly.com/question/29129606

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Answer:

1.031atm

Explanation: