CHEMISTRY MIDDLE SCHOOL

Is popping popcorn a physical or chemical change? Explain your answers.

Answers

Answer 1
Answer: it would be a physical change because if you were to pop popcorn the popcorn would go from a kernel to a popcorn peice therfore the physical state is alterered/changed\.

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Write this number in standard notation.
1.986 x 10negative exponent 6 or 1.986 x 10^6

Answers

Answer:

0.000001986

Explanation:

We have the number 1.986*10^(-6). Standard notation would basically be this number without the 10^(-6) part.

To get rid of this part, we need to move the decimal point 6 places to the left (we go left because it's negative 6, indicating division).

So, when we move the decimal point 6 places to the left, the resulting number is: 0.000001986, with 5 zeros after the decimal point before a nonzero number.

Thus, the answer is 0.000001986.

How to revise in just 1 whole day for chemistry combined science is it possible to get a good grade

Answers

it will be hard, but you can do it. Just study given the materials for the course. Understand enthalpy and entropy, and various types of bonding and you'll be fine.

What human life process requires hydrochloric acid?

THANKS!!!

Answers

The answer is Enzyme

Which formula is an empirical formula?A. N2O4

B. NH3

C. C3H6

D. P4O10

Answers

The compound that represents empiricalformula is NH3.

EMPIRICAL FORMULA:

  • Empirical formula refers to formula of a compound that depicts the simplest whole number ratio of its constituent element.

  • The empirical ratio of the elements of a compound should not be able to be broken down further. For example: compounds such as N2O4, C3H6, and P4O10 can be further broken down into NO2, CH2 and P2O5.

  • This means that NH3 is the empiricalformula because it is the simplest whole number ratio of the compound.

Learn more at: brainly.com/question/21280037?referrer=searchResults

Hello!

The answer is:

The empirical formula is the option B.NH_(3)

Why?

The empirical formula of a compound is the simplest formula that can be written. On the opposite, the molecular formula involves a variant of the same compound, but it can be also simplified to an empirical formula.

MolecularFormula=n(EmpiricalFormula)

We are looking for a formula that cannot be simplified by dividing the number of molecules/atoms that conforms the compound.

Let's discard option by option in order to find which formula is an empirical formula (cannot be simplified)

A.N_(2)O_(4)

It's not an empirical formula, it's a molecular formula since it can be obtained by multiplying the empirical formula of the same compound.

N_(2)O_(4)=2(NO_(2))

B.NH_(3)

It's an empirical formula since it cannot be obtained by the multiplication of a whole number and the simplest formula. It's the simplest formula that we can find of the compound.

C.C_(3)H_(6)

It's not an empirical formula, it's a molecular formula since it can be obtained by multiplying the empirical formula of the same compound.

C_(3)H_(6)=3(CH_(2))

D. P_(4)O_(10)

It's not an empirical formula, it's a molecular formula since it can be obtained by multiplying the empirical formula of the same compound.

P_(4)O_(10)=2(P_(2)O_(5))

Hence, the empirical formula is the optionB.NH_(3)

Have a nice day!

what would happen if the cell wall in a plant cell just broke like all of them at the same time would it change the color or will it grow faster or will it die what will hapen

Answers

It would not change the color and it would not grow anymore. The cell wall is the outside layer of a plant, so if it eventually breaks off for some reason, it cannot grow anymore. Some plants can survive if their cell wall broke off, like a cactus. Cactuses can keep growing because it can be tall or short. (if someone like cut it in half or something, the cactus can still grow) Cactus does not have any leaves or anything connected to it (except for thorns) and if you break it, it can still grow.

Answer:

the cell will either

Explanation:

Daniel observed and compared some stars at night and recorded his observations in a chart.Daniel later discovered that star X is farther away from Earth than the other stars he observed, and star Z is closest to Earth.

Which conclusion is best supported by Daniel’s observations and discoveries?

Star X is more luminous than both stars Y and Z.
Star X is more luminous than star Z, but not star Y.
Star Y is more luminous than star X.
Star Z is more luminous than star Y.


PLEASE HELP

Answers

Answer:

The Answer is A) Star X is more luminous than both stars Y and Z.

Explanation:

it just is

Answer: A. Star X is more luminous than both stars Y and Z.

Explanation: Edge 2021
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