Help me please I’ll give brainliest answer

Answer:

the law of conservation of energy states that energy neither created nor destroyed that means in a chemical reaction Mass reactants ( starting material)=tomass of produt

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Answer:

I think its C

Explanation:

c

Answer:

copper

Explanation:

metallic bonds occur among the metal atoms where iconic bonds join metal and nonmetals metallic bonding joins a bolt of metal atoms a sheet of aluminum foil and a copper wire are both place where you can see metallic bonding in action the Sea of electrons that is free to flow about the crystal of positive metal ions

Metallic bonding occurs between metal atoms. Among the given copper is example of metal in which copper atoms are strongly held by metallic bonds.

Metals are electropositive elements. Metals contains a pool of mobile electrons among the sea of positive ions. Metals exhibit some peculiar features such as conductivity, hardness, malleability, ductility, luster etc.

Metals atoms form well orders crystalline structure in which particles are held together by strong metallic bonds. In periodic table, the first two groups and all the d-block elements are metals.

Copper is a transition metal in d-block. Copper is a very important metal in our lives and in industries since it is used in constructions, electronics, house hold items etc., because of its hardness and conductivity. Hence, option 2 is correct.

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Explanation:

Crystallography. an arrangement in space of isolated points (lattice points ) in a regular pattern, showing the positions of atoms, molecules, or ions in the structure of a crystal.

If an atom experiences sufficient thermal activation, it can move to a neighboring lattice position.4 If the vibration frequency of the atom is v and the atom has Z nearest neighbors, the total number of jump attempts is vZ. However, only a small fraction of the attempts will be successful, with a probability depending on the ratio between the necessary activation energy for a single jump QD and the thermal activation kBT. The effective jump frequency ΓD is then

(5.6)

With each successful jump, the atom travels one atomic distance λ and the total traveling distance in unit time is thus ΓDλ. Substituting the jump frequency ΓD into the expression for the root mean square displacement of a random walker [equation (5.5)] and using the spatial coordinate r leads to

Answer:

D= 0.79 g/mL

Explanation:

Density= mass/volume

D= (15.8 g)/(20.0 mL)

D= 0.79 g/mL

Answer:

156748

Explanation:

The first number is on the magnetism card 1

The combination  contains only the numbers found on the cards showing techniques to separate mixtures 1,5,6,7,8

The last number is on the filtering card

The red is in the middle half of 8 is 4

Answer:

Yes you’re correct :)

Explanation:

Answer: the answer is A. Zinc (ZN)

Explanation: jus did a quiz with this quest thx for da points good luck :D

the correct combo is C

We know sunlight is key factor in photosynthesis so A and D are out.

we also know plants get their bulk by breaking up co2 and using the carbon which releases oxygen as a byproduct so B is also out of the question.

Answer:

jupiter is your answer

Explanation:

you weigh more there

Answer:

(5.50) ( 6.02 *10^23)

Explanation:

The number of molecules equals the number of moles times Avagadro's number.

Answer:

if you want to protect our ozone depletion you have aerosol products that don't contain HCFCs and CFCs as stimulus or incitement

Explanation:

why you should use aerosol because when the liquid mixture is freeded or released from the aerosol the liquid propellant becomes a gas so this can easily break up the product into a fine haze or a mist hope its helpful have a good luck

Answer:

-198.15

Explanation:

sorry if wrong form

Answer:

Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment.

Explanation:

True

Answer:  

Explanation:

Answer:

A. Basic Unit Of Life.

Explanation:

Matter is made up of elements. Also, We have Atoms In our Body.

Answer:

One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.

brainliest plz

Explanation:

a light bulb is the example of chemical energy

Answer:

a light bulb

Explanation:

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Answer:

so wat is it in?.....????

1. too

2. for

3. ate

4.for teen

5. suck`s teen

did i get it right?

The molecular formula for Nickel (IV) Chloride will be NiCl₂. Nickel reacts with chloride to form a salt. The salt is yellow in color and anhydrous.

A molecular formula is a way of presentation of chemical formula of a compound. It gives the information related to the type of atoms, number of atoms which constitutes the compound and the chemical properties.

Molecular formula of a chemical compound can be derived by the valency of element. In this question, molecular formula of the compound can be derived by:

Valency of Nickel = 2

Valency of Chlorine = 1

By the cross-multiplication of valency:

element 1(valency of element 2). element 2 (valency of element 1)

= Ni (1). Cl(2)

= NiCl₂

Therefore, the molecular formula of Nickel (IV) chloride will be NiCl₂.

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Answer:

c

Explanation:

trust me its reasonanle

Per cent composition of Magnesium (Mg) in Magnesium Phosphate compound ie [tex]Mg_3(PO_4)_2[/tex] is 27.74%. Hence, option C is correct.

Percent is from the Latin adverbial phrase per centum meaning “by the hundred.”

Determination of the percentage composition of Mg in Mg₃(PO₄)₂

Molar mass of Mg₃(PO₄)₂ = 262 g/mol

Mass of Mg in Mg₃(PO₄)₂ = 24×3 = 72 g

Percentage composition of Mg =?

[tex]Percentage = \frac{Mass \;of \;elements x 100}{Mass \;of \;compound}[/tex]

[tex]Percentage = \frac{72 X 100}{262}[/tex]

27.74%.

Hence, option C is correct.

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Answer:

B. A scientific law describes what always happens under specific

conditions in nature.

Explanation:

Scientific law is something that has been proven over and over and therefore is always correct under conditions in nature.

Answer:

B. A scientific law describes what always happens under specific

conditions in nature.

Explanation:

Scientific law is based on observation and experiments to support a claim. It usually describes nature.  

Answer:

Lithium and Beryllium

Rubidium and Bromine

Francium and Chromium

Rubidium and Calcium

Lithium and Chlorine

Fluorine and Neo

Answer:

Rb and Br

Fr and Cl

Li and Cl

Explanation:

Answer:

A. A. it will shrink.

A. slow down .

Explanation:

Hello there!

In this case, according to the gas laws, it is possible to answer to this questions:

1. Here, it is required to study a volume-temperature relationship by means of the Charles' law which states that the volume decreases as temperature does; for that reason, when dunking  the balloon into the cold water, one can notice A. it will shrink.

2. Here, according to the kinetic molecular theory, which states that higher temperatures provide higher amounts of energy to the molecules to move faster as they gain thermal energy; it is possible to infer that when a sample of gas is cooled, the particles of A. slow down  as they lose thermal energy.

Best regards!

Answer:

Friction. Hope I helped.

Answer:

See explanation

Explanation:

From the formula for heat;

q (enthalpy change) = (mass of solution) x (specific heat capacity) x (temperature change)

Since the density and heat capacity of the solution are the same as that of pure water.

Mass of copper sulphate solution = 50 g

Heat = 50 * 4.18 * 50.6°C

Heat = 10575.4 J

Number of moles = 1 * 25/1000 = 0.025 moles

10575.4 J/ 0.025 moles = 432016 J/mol/1000

= 423 KJ/mol

or

q = - 423 KJ/mol