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3 years ago

The mass of the quartz crystal shown below is 10 grams, and its volume is 4 cm3. What is the density of quartz?

Chemistry

1 answer:

Tju [1.3M]3 years ago

8 0

Answer:

${\boxed{\text{b. 2.5 g/cm}^{3}}}$

Explanation:

$\text{Density} = \dfrac{m}{V} = \dfrac{\text{mass}}{\text{volume}}$

Data:

m = 10 g

V = 4 cm³

Calculation:

$\text{Density} = \dfrac{\text{10 g}}{\text{4 cm}^{3}} = \textbf{2.5 g/cm}^{3}\\\text{The density of the crystal is ${\boxed{\textbf{2.5 g/cm}^{3}}}$}$

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Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample

Alenkinab [10]

Answer:

Density, $d=6.38\ g/cm^3$

Explanation:

It is given that, placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL.

It means that the volume of the sample is 12 mL

The weight of the sample is 76.6 g

We need to find the density of the sample.

12 mL = 12 cm³

The formula of density is given by :

$d=\dfrac{m}{V}\\\\d=\dfrac{76.6\ g}{12\ cm^3}\\\\d=6.38\ g/cm^3$

So, the density of the sample is $6.38\ g/cm^3$ .

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2 years ago

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d perovskite single crystals with suppressed ion migration for high-performance planar-type photodetectors, small

Naily [24]

Due to their improved charge transfer and great environmental stability, 2D Dion-Jacobson (DJ) perovskites have recently received a lot of attention.

Unfortunately, due to the scarcity of high-quality single crystals for precise measurements, their fundamental optoelectronic capabilities are mainly unknown. Here, a reactive, low-temperature-gradient crystallization method is created using 1,4-butanediammonium as a short-chain insulating spacer to generate high-quality 2D perovskite single crystal (BDAPbI4). It is discovered that the BDAPbI4 single crystal exhibits a direct bandgap with effective charge collection (μτ = 1.45 × 10−3 cm2 V−1). The BDAPbI4 single crystal in particular exhibits the expected high ion migration activation energy (0.88 eV).

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brainly.com/question/20342415

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1 year ago

5 - HCN + CuSO4 → Type of reaction

lesya692 [45]

Answer:

$CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}$

Explanation:

The valancy of Cu = +2

SO4 = -2

CN = -1

H =+1

So when HCN and CuSO4 react Cu(CN)2 and H2SO4 are formed.

Cu(CN)2 formation :

2 CN = 2 x -1 = -2

Its should attach to +2 charge atom which is Cu

So 1 Cu and 2 CN = Cu(CN)2

Similary,

H2SO4 formation:

SO4 = -2 charge

It require +2 charge so need two H+

2 H = 2x1 = +2 charge

Hence , 1 SO4 and 2 H combine to form H2SO4

Law of conservation of mass: It states that mass can neither be created nor destroyed during a chemical reaction.

Total mass of the reactant must be equal to total mass of product.

Only those equations are balanced which follows law of conservation of mass

Count total number of atoms in the reactant and product .

The number of atoms in the product = The number of atoms in the reactant

In the given equation:

$CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}$

Reactant are 2HCN and CuSO4

atoms of H = 1x2=2 , C=1x2=2 , N=1x2=2 , Cu = 1, S = 1 ,O =4

Products: Cu(CN)2 and H2SO4

atoms of H =2 , S=1 , O=4 ,C = 2x1=2 , N = 2x1 =2 , Cu = 1

Hence this is balance equation

7 0

3 years ago

1. What is the function of fiber in our body

liq [111]

Fiber aids in waste remover

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2 years ago

Select the true statement for the following reaction: N2 + 3 H2 → 2 NH3 1. Each N atom is reduced from 0 to +3. Each H atom is o

ELEN [110]

Answer: option 2

Explanation: each nitrogen is reduced from zero to -3 and Each H is Oxidised from 0 to +1

Since oxidation no of Nitrogen in molecular N2 is always zero and for H2 also zero.

In NH3, x+3(+1)=0

X+3=0

X=-3

And and hydrogen shows +1 Oxidation no when it is combined with non metal(like N,O,cl) and with -2 with metal like Na,Ca etc.

And zero in molecular form H2.

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2 years ago