Put the steps below in the order they are performed in the lab experiment by numbering them 1-7. Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases. Measure the final masses of the crucible, cover, and anhydrous salt. Compute differences in masses to find the reactants and products. Measure initial masses of the crucible and cover, with and without the hydrate. Use the numbers of moles to compute the mole ratio. Use stoichiometry to convert these masses to moles. Use the mole ratio to write the hydrate’s formula.

Answer:

I’m not sure probably false

Explanation:

Answer:

viruses can kill you vaccines can save your life.

Explanation:

Answer:

The effect of leaky vaccines on how disease spreads is explained by the “imperfect-vaccine hypothesis”. It holds that, without vaccination, a very virulent virus can get into a population and kill infected hosts (people or animals) very quickly – before they have a chance to spread it. This means that the virus will die out very quickly too, as all potential hosts will be dead or immune to it.

Explanation:

Answer:

Both have a definite mass and volume, but only the frozen Ice cube has definite shape

Explanation:

Water(Liquid) Takes on the forms of other things, Such as cups

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:

Answer:

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

Number of molecules NH₃ = 4.45 x 10²²

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol of NH₃ = n = 0.074

So the number of molecules :

[tex]\tt N=n\times No\\\\N=0.0740\times 6.02\times 10^{23}\\\\N=4.45\times 10^{22}[/tex]

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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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:

The phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside which is a process known as is represented by the arrow 2

Explanation:

The different phase transitions that occur in mater are;

1) A phase transition from the solid phase to the liquid phase which occur by heating, represented by the arrow 2 and the process is known as melting

2)  A phase transition from the liquid phase to the gaseous phase which occur by further heating the liquid, represented by the arrow 1 and the process is known as evaporation

3) A phase transition from the gaseous phase to the liquid phase which occur by cooling the hot gas, represented by the arrow 2 and is known as condensation

4) A phase transition from the liquid phase to the solid phase which occur by further cooling the liquid, represented by the arrow 5 and the process is known as freezing

5) A phase transition from the solid phase to the gaseous phase which occur by heating the cold solid, represented by the arrow 3 and the process is known as sublimation

6) A phase transition from the gaseous phase to the solid phase which occur by cooling the gas, represented by the arrow 6

Therefore, the phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside is represented by the arrow 2

the answer is Brittleness

The characteristic that is not present in metals that can be attributed to the bonding and arrangement of atoms is brittleness. The correct option is A.

Metals are the chemical elements present in the periodic table. They are classified as metals because of their properties of reacting, softness and malleability, etc.

Some metals are iron, oxygen, magnesium, aluminum, etc. They are both solid, liquid, or gas. They are highly electrical or thermally conductive, ductile, and reflective.

On the other hand, non-metals are less reactive, very hard, and non-malleable. Brittleness is the quality of non-metals, not metals. Due to the brittleness of non-metals, they are not easy to the bonding and arrangement of atoms.

Thus, the correct option is A. brittleness.

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Answer:

C

Explanation:

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:

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:

electromagnet

Explanation:

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.

Answer:

when the atom is neutral

Explanation:

Answer:up

Explanation:

Answer:

3.75mole

Explanation:

Given parameters:

Mass of the carbon(C) = 45g

Unknown:

Number of moles of carbon  = ?

Solution:

The number of moles of a substance can be found using;

      Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

Molar mass of carbon  = 12g/mol

    Number of moles  = [tex]\frac{45}{12}[/tex]   = 3.75mole

Ernest Rutherford gave the atomic model based on the centrally located mass of the atom. The α particles passed through the foil as an atom has empty spaces.

Rutherford gave the atomic model by bombarding the gold foil with an alpha particle from radioactive material. It gave the atomic structure constituting the sub-atomic particles.

Most of the alpha particles passed straight through the foil which concluded that most of the space in the atom was empty and the major mass was accumulated at the center.

Therefore, the α particles passed straight as most of the atom has empty spaces.

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Answer:

it contains 2.56 x 10^15.

Explanation:

given no. of moles = 4.26 x 10^-9 atoms

one mole has 6.022 x 10^23 atoms

so it contains 4.26 x 10^-9 x 6.022 x 10^23 atoms

(If we suppose silver's atomic weight as 108.)

I LOVE balancing chemical equations!

Answer:

2 Zn + 2 HCl -> 2 ZnCl + 1 H₂

Explanation:

These coefficients correct balance this equation.

Please add me as Brainliest, I need it to move onto the next level.

Answer:

Gylcerol Back Bone

Carbons and Hydrogens

Explanation:

Answer:

nitrogen dioxide

Explanation:

this was on my chemistry test

Answer:

number 3 i think

Explanation: im sorry if im wrong

Mercury is in a liquid state

Mercury's melting point is somewhere around -34 Degrees Celcius. Thus it should be assumed it will be a liquid at this temperature. Not a gas however as mercury's boiling point is somewhere in the 600 Degree range

Answer:

3.9283 x 10^-3

Explanation:

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

Answer:

Wavelength increases, and frequency decreases.

for my lazy friends its letter C

Explanation:

e2021

The statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).

The term wavelength makes reference to the distance between the picks of the waves in the electromagnetic spectrum.

In conclusion, the statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).

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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:

Answer:

h B i f M r

Explanation:

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