all matter can be classified as either a pure substance or a mixture classify each of the following as to whether it is a substance or mixture. if it is a mixture, write element or compound in the substance column. if it is a mizture write heterogenous or homogenous in the mixture column

Answer:

The chemistry between you will be instant. Sometimes it may be hard to know if they like you back. Knowing that you can not live without them and that you bump in to each other everywhere you go, is fate at work. You might also just need the courage to ask them out. You never know what will happen if you try. :)

Answer:

You will feel it

Explanation:

Catalysts are molecules that lower the activation energy for a given reaction. The specific term used for biological catalysts is Enzymes.

A catalyst is defined as a substance which increase the rate of the reaction chemical reaction, and lowers the pressure and temperature which are needed to start one, in such a way that it doesn't take participate in the reaction.

Activation energy is the minimum amount of energy which must be needed by the compounds foe the production in a chemical reaction. The activation energy of chemical reaction is mainly measured in joules per mole, kilocalories per mole or in kilojoules per mole.

Enzymes are the chemical catalysts which accelerate the chemical reactions at the physiological temperatures by decreasing their activation energy.

Thus, we concluded that the biological Catalysts that lower the activation energy for a given reaction is Enzymes.

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Answer:

ppsuck

Explanation:

f;lhfadlkahglkaga

Answer:

h B i f M r

Explanation:

that was just my estimated guess but it seems right to me

Answer:

"This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L. It is important to note, however, that if the conditions of the gas are different this conversion will NOT work. Under those conditions you must use the ideal gas law to convert between moles and liters."

Answer:

A raised weight.,Water that is behind a dam,A car that is parked at the top of a hill.----potential energy

The second law of thermodynamics is a physical law based on universal experience concerning heat and energy interconversions. 

Answer:

aristotle din not beileve in anything. he looked at the world describe what happend

Answer:

Explanation:

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O   →  CO  + H₂

ΔH = +131 kj/mol

it can be written as,

C +  H₂O  + 131 kj/mol  →  CO  + H₂

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Answer:

0.037 volts

Explanation:

Answer:

when the atom is neutral

Explanation:

The chemical formula of this compound is NBr₂Cl.

A chemical formula shows the elements in a compound and the relative proportions of those elements.

The name of this compound is N,N-dibromochloroamine.

Molar mass of the compound NBr₂Cl is 209.26 g/mol.

Nitrogen is the central atom in this compound (see the picture below).

Electron configuration for nitrogen: ₇N 1s² 2s² 2p³.

Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.

Electron configuration of bromine: ₃₅Br 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵.

Nitrogen is in group 15 of Periodic table of elements and his atomic number is seven, which means that nitrogen has seven electrons.

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Answer:

Building artificial reefs and limiting fishing activity

Explanation:

The only activity that can successfully increase the natural biodiversity of fishes in the area would be building artificial reefs and limiting fishing activities.

The building of artificial reefs would create several microhabitats for fishes to thrive while limiting fishing activities would ensure that the rate of thriving or multiplication of fishes far outweighs the rate fishes are being removed from the area. Both actions will work synergistically to increase the natural biodiversity of fishes in the area.

The introduction of non-native species can have a negative consequence for the area as non-native species have a history of reducing biodiversity by outcompeting the native species and becoming invasive.

Building artificial reefs and increasing fishing activities would be counterproductive. While artificial reefs can increase the thriving of fishes, increasing fishing activities would take away the gains of the artificial reefs.

Eliminating non-native species and encouraging fishing for large predatory fish will disrupt the ecological balance of the area and might have negative effects on biodiversity.

Answer:

3.9283 x 10^-3

Explanation:

Assuming there is a missing decimal in front of your first zero

Answer:

0.1988 J/g°C

Explanation:

-Qmetal = Qwater

Q = mc∆T

Where;

Q = amount of heat

m = mass of substance

c = specific heat of substance

∆T = change in temperature

Hence;

-{mc∆T} of metal = {mc∆T} of water

From the information provided in this question, For water; m= 22.0g, ∆T = (24°C-19°C), c = 4.18J/g°C.

For metal; m= 34.0g, ∆T = (24°C-92°C), c = ?

Note that, the final temperature of water and the metal = 24°C

-{34 × c × (24°C-92°C)} = 22 × 4.18 × (24°C-19°C)

-{34 × c × (-68°C)} = 459.8

-{34 × c × -68} = 459.8

-{-2312c} = 459.8

+2312c = 459.8

c = 459.8/2312

c = 0.1988

The specific heat capacity of the metal is 0.1988 J/g°C

Answer:

B.  An electron from the sodium atom moves to  the fluorine atom forming two ions.

Explanation:

In forming this ionic compound NaF, an electron is transferred from the sodium atom to the fluorine atom and two ions are formed.

A branch of science which deals with the study of chemicals is called chemistry.

The correct answer to the question is B.

The reaction between the acid and base is called a neutralization reaction and forms the salt.

Salt is an ionic compound in which cation and anion joined together to form a compound. In an ionic compound, one element gives electrons to the other element to complete the outer shell and make a bond. In the question, sodium has more electrons and gives them to fluorine.

Hence, the correct option is B that is An electron from the sodium atom moves to  the fluorine atom forming two ions.

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Answer:

H 13.8mol CO2

Explanation:

we know that per 1 mol there is 6.022x10^23 molecules

so divide 8.23x10^22/ AVG # ( # above) we get 13.8mol of CO2 not to be confused with A

Answer:fire?

Explanation: it gains heat from heat/friction, and losses it if its been lighted up for too long (it can be used as light)

Peanuts, or milk please leave like if right

Answer:

air

Explanation:

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.

Answer:

burning wood is an example of kinetic energy.

Explanation:

because when the wood is burning it is releasing the stored energy.

hope this answer will help you

have a great time

Answer:

64.2

Explanation:

2.8+17.8+13.7+8+21.9 = 64.2

Answer:

for you to get smarter

Explanation:

Why teachers give lots of work:

They teach you new things you may not have known before

They teach you to think.

They teach you to be curious about things you didn’t know you wanted to know.

They try and teach you the reason you should love learning.

They teach you about different perspectives in our world.

They teach you how mistakes can be learned from.

They teach you how to take turns.

They teach you respect.

They teach you about the world - one that is outside your house, town, state, continent, and most of your mind.

They show you books you would never pick up on your own.

They teach you the how, who, what, why, where, and when.

They teach you the importance of communication.

They teach you how to get along with others - even those you don’t like.

They teach you to share.

They teach you patience.

They teach you compassion.

These are only a few things a good teacher will teach you. Some you will learn in a year and other things take several years and several teachers.

domain, kingdom, phylum, class, order, family, genus, and species

domain

Archaea, Bacteria, and Eukarya

kingdom

animal, plant, fungi, protist and monera.

phylum

Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata.]

Answer:

Mass = 80.6 g

Explanation:

Given data:

Mass of N₂ consumed = ?

Mass of CaCN₂ formed = 265 g

Solution:

Chemical equation:

CaC₂ + N₂      →       CaCN₂ + C

Number of moles of CaCN₂:

Number of moles = mass/molar mass

Number of moles = 265 g/ 92.11 g/mol

Number of moles = 2.88 mol

Now we will compare the moles of CaCN₂ and N₂.

                               CaCN₂            :            N₂

                                   1                   :              1

                                  2.88              :            2.88

Mass of N₂:

Mass = number of moles × molar mass

Mass = 2.88 mol × 28 g/mol

Mass = 80.6 g

Answer:

I’m not sure probably false

Explanation:

Answer:

C. Bromine

Explanation:In ionic bond , the metals looses electron and the non metal gains electron.

In the given options ;

Aluminum (Al)= METAL

Copper (Cu) = METAL

Bromine (Br) = NON METAL

Oxygen (O) = NON METAL

That leaves us with bromine and oxygen.

Oxygen has an electronic configuration of 2,6.(see image).

So oxygen needs to gain two electrons.

Bromine has one valence electron ( see image).

So therefore , Bromine needs to gain one electron as It is in Group VII

Answer:

can't do much

Explanation:

baking soda;8,alkaline

bleach:12,alkaline.

coffee:5.10,acidic

coke;coke,acidic

milk;6.9,acidic.

lemon juice;2,acidic

this is all i can do.

Answer:

Wouldn't rust because zinc will lose electrons more readily than iron and will therefore oxidize first.

Explanation:

This process whereby rusting of steel is prevented by coating the steel with a layer of zinc is known as galvanization.

Now, in this process, the steel object will be coated in a thin layer of zinc. This coating will prevent oxygen and water from reaching the underneath metal since the zinc will also act as a sacrificial metal.

Now, Zinc is used because it has a lower reduction potential than iron and thus it will get easily more oxidized than iron. Which means the zinc will lose electrons more readily than iron.

Also, since zinc has a lower reduction potential, it is therefore the more active metal. Thus, even if the zinc coating is scratched and the steel is exposed to moist air, the zinc will still get to oxidize before the iron.

Answer:

1. Foods that have changes that are chemically introduced.

2. corn soybeans apples etc

3. sot they last longer or look better

4. new dna is placed in them and their seeds

5. they are not as good for humans

Explanation:

Answer:

Unicellular organisms do not have levels of organization. Unicellular organisms need fewer resources and some can live in harsh conditions. They are very small and are easily eaten by other organisms

Explanation: