The cube has a mass of 72.9 g.What is its density in g/cm3?

What substance is it?

Answers

Answer 1

Answer: If the cube is 3 cm on each side, then it has a volume of 27 cm^3 (3 x 3 x 3). Density is mass divided by volume, so its density is 72.9/27 = 2.7 g/cm^3.

Going by the density, the cube is made of Aluminium - density is a fairly unique quantity

Answer 2

Answer:

Answer: aluminum and 2.7

Explanation:

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The glow emitted by a substance exposed to eternal radiation is called

Answers

The glow emitted by a substance exposed to external radiation is called 'fluorescence'. In fluorescence, a fluorophore is exposed to external radiation, absorbs the energy and emits a form of light or glow. The answer to this question is 'fluorescence'. I hope this helps.

Which is the molar mass of BF3?10.81 g/mol
29.81 g/mol
48.81 g/mol
67.81 g/mol

Answers

The molar mass of BF3 is 67.81 g/mol

Explanation

Molar mass is the mass of all atoms in a molecule in gram per mole.
molar mass of a molecule is calculated by adding atomic mass of constituent atom

use the periodic table to determine the atomic mass of each element in the molecule.

that is;

atomic mass of B = 10.81 g/mol

atomic mass of F = 19 g/mol

since there 3 atoms of F in BF3 the atomic massof F in BF3= 3 x19 = 57 g/mol

total molar mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81 g/mol

67.81 g/mol is the molar mass of BF $_3$ . Therefore, the correct option is option D among all the given options.

The ratio among the mass with the quantity of substance (measured within moles) in any sample of a compound of chemicals is known as the molar mass (M) in chemistry. The molar mass of a material is a bulk attribute rather than a molecular one. The compound's molecular weight is an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average or a function of the relative proportion of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.

atomic mass of B = 10.81 g/mol

atomic mass of F = 19 g/mol

atomic massof F in BF $_3$ = 3 x19 = 57 g/mol

total molar mass of BF $_3$ = 10.81 g/mol + 57 g/mol = 67.81 g/mol

Therefore, the correct option is option D.

To know more about molar mass, here:

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Select the ion.

1)Cu
2)PO4-3
3)SO2

Answers

I believe the answer is B. PO4-3

Answer:

Explanation: the answer is B. PO4-3

Given the balanced equation representing a reaction:6Li +N2 --> 2Li3N
Which type of chemical reaction is represented by this equation?
(1) synthesis (2) decomposition
(3) single replacement (4) double replacement

Answers

Answer : The correct option is, (1) synthesis

Explanation :

Synthesis reaction : A type of chemical reaction in which multiple reactants combine to form a single product.

It is represented as,

$X+Y\rightarrow XY$

Decomposition reaction : A type of chemical reaction in which a single reactant decomposes into two or more products.

It is represented as,

$XY\rightarrow X+Y$

Single replacement reaction : A type of chemical reaction where the more reactive element replace the less reactive element.

It is represented as,

$A+BC\rightarrow AC+B$

(A is more reactive element and B is less reactive element)

Double replacement reaction : A type of chemical reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.

It is represented as,

$AB+CD\rightarrow AD+CB$

(A and C are the cations, B and D are the anions)

The given balanced reaction is,

$6Li+N_2\rightarrow 2Li_3N$

The given reaction is an example of synthesis reaction in which lithium combine with the nitrogen to form a single product as lithium nitride.

Hence, the correct option is, (1) synthesis reaction

(1) synthesis is the answer because only one product is formed~

In the formation of a macromolecule, what type of bond would join two amino acid subunits? A)           ionic bond
                B)            phosphodiester bond
                C)            hydrogen bond
                D)           peptide bond

Answers

I think its an Ionic bond although i am not sure about

A 134.0 g sample of an unknown metal is heated to 91.0⁰C and then placed in 125 g (125 mL) of water at 25.0⁰C. The final temperature of the water is measured at 31.0⁰C. Calculate the specific heat capacity of the unknown metal.