12 points and brainest

Answer:

B

Explanation:

Density = mass / volume

66 grams / 10 cm = 6.6 g per cubic cm

Answer:

electromagnetic wave

Explanation:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate.

Answer:

Explanation:

Na 2O + CO 2 → Na 2CO. 3

This is an acid-base reaction (neutralization): Na 2O is a base, CO 2 is an acid.

Hope this helps!!!!!!

Brainlist please

The reaction of N₂O with CO₂ giving Na₂CO₃ is a combination reaction, where two reactants combines to form a product.

There are different kinds of reactions namely, displacement reactions, combination reactions, decomposition reaction etc.

The reaction in which one reactant species displace the constituent group of another reactant it is termed as displacement reactions. On decomposition reaction, one reactant decomposes into two or more products.

In a single displacement reaction, one of the group is displaced to form a new product and in double displacement reactions, two species from reactant side are displaced.

Similarly, a reaction in which two reactants simply combines to form a product is termed as combination reaction.

Therefore, the type of the given reaction is combination.

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Answer: Radioisotopes are used by manufacturers as tracers to monitor fluid flow and filtration, detect leaks, and gauge engine wear and corrosion of process equipment. Small concentrations of short-lived isotopes can be detected whilst no residues remain in the environment.

Explanation: Uranium-235 is used for nuclear fission and as a fuel in nuclear reactors.

An isotope of cobalt is used in the treatment of cancer.

An isotope of iodine is used in the treatment of goiter.

Answer:

It would take you 8 hours.

Explanation:

This would take you 8 hours because you are going 1 mile an hour. So in 1 hour, you would have gone 1 mile.

Answer:

Reactant

Explanation:

The chemical expression is given as:

             2Na        +       Cl₂     →   2NaCl

The species on the left hand side which are Na and Cl₂ are referred to as the reactants.

The specie on the right hand side, NaCl is the product of the reaction.

There is no catalyst shown in this reaction.

Such a reaction as this is called a combination reaction or synthesis reaction in which two reactants gives rise to a product.

Answer:

a. forces cause bonds to form

Answer:

Hey again!

Q1: 4 N

Q2: 24 N

Answer:

A i did it on edge

Explanation:

Aaaaaaaaaaaaaaa

Answer:

electrolytic reaction; oxygen and hydrogen combine to form water, producing electrical energy and releasing heat.

Explanation:

Answer:

A. Something positive and negative

Explanation:

Answer: It's chemical

Explanation:

Because it's chemical :))

Answer:

a

Explanation:

its a

Answer:

a I guess

Explanation:

Answer: 27 is A and 28 is C.

Explanation: I’ll explain 28 but not 27 because that’s just definitions.

In CuSO4 there is a Cu, an S, and 4 O molecules. Add them up you get 6.

Answer:

Answer is in the photo

Explanation:

Have a nice day and if the photo isn’t visible let me know! :)

The balance chemical equation is as,

[tex]2NaCl[/tex] → [tex]2Na + Cl_{2}[/tex]

The 30.1 grams of chlorine are produced when the sodium chloride decomposes and produces 19.5 grams of sodium.

Calculation,

22.99 g of sodium present in 1 mole of sodium atom.

In 19.5 g  of sodium = 19.5 g× 1 mole / 22.99 g = 0.85 mole

The mole ratio = 2:1

It means 2 mole of sodium produce along with  1 mole of chlorine when sodium chloride decomposed.

So, number of mole of chlorine when 0.84 mole of sodium produce =  0.85 mole×1 mole/ 2 mole = 0.424 mole

number of mole of chlorine = given mass/molar mass of [tex]Cl_{2}[/tex] = 0.424

Given mass of [tex]Cl_{2}[/tex] = molar mass  of [tex]Cl_{2}[/tex]×  number of moles of [tex]Cl_{2}[/tex] = 70.9×0.424 = 30.1 gram

The symbolic representation in which number of atoms in reactant side is equal to number of atoms in product side.

learn about balance chemical equation,

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Answer:

b

Explanation:

furutitirhrhirgrkgrigrigrivrgr

Answer:c

Explanation:

Answer:

Zn + K2CrO4 -----> 2K + ZnCrO4

Explanation:

Answer:

exist in fixed amounts

Explanation:

The only attribute that describes nonrenewable resources is the existence in fixed amounts.

Nonrenewable resources are limited in amount and depleted at a much faster rate than they are naturally replaced. Even when they are to be replaced, it cannot be done within a short period.

An example is crude oil which exists as natural deposits deep in the ground. The world's crude oil deposit is limited and cannot be replaced at a rate they are being used by man if at all it can be replaced.

An attribute of nonrenewable resources' is they exist in fixed amount. The  correct option is A.

Non-renewable resources are those resources which are produced in millions of years, and are limited. Once these resources extincted, it will take millions of years again to produce these resources.

Thus, the correct option is A, exist in fixed amount.

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Explanation:

It is mainly the very low density of gases that make them bad conductors of heat. In liquids and solids atoms and molecules are densely packed and transfer of energy has much smaller distances to happen.

hope it helps u

Answer: it would be b time taken by the glass surface to dry

Explanation:

i had took the test and i got it right

Answer:

B: Time taken by the glass surface to dry

Explanation:

because if you go to a store and buy two different brands like for example you but windex or invisible glass then you can say for example if i use windex it will dry faster and with invisible glass i will take longer to dry  but if you use windex witch drys faster then you will not have streaks on the table when someone sits.   and i also got it  right

Answer:

A

Explanation:

_N2 + _H2 - _NH3

LHS RHS

N=2×1=2 N=1×2=2

H=2×3=6 H=3×2=6

1,3,2

Answer:

CO2

Explanation:

we can see one carbon atom and 2 oxygens meaning this is Carbon dioxide or CO2

Here's the question written out so others can find it if they need:

Provide a structure for the following compound: C6H16N2; IR: 3281 cm–1; 1H NMR: δ 1.1 (8H, t, J = 7 Hz), δ 2.66 (4H, q, J = 7 Hz), δ 2.83 (4H, s). (Hint: The triplet at δ 1.1 conceals another broad resonance that contributes to the integral.)

THIS IS THE ANSWER:       CH3-CH2-NH-CH2-CH2-NH-CH2-CH3

I hope this helps! Please give Brainliest if you feel this helped. Have a good day and a good rest of your 2021, best of luck with your classes.

Answer:

the answer is below.

Explanation:

CH3-CH2-NH-CH2-CH2-NH-CH2-CH3

Answer:

58x999 is equal to 57,942

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The number is 6.022 x 10^23 atoms/mol.