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3 years ago

Of the objects below, is the most dense. Of the objects below, is the most dense.

1 answer:

8 0

The correct answer is option B.
n object with a volume of 3.91 × 10-24 nm3 and a mass of 7.93 × 10-1 ng is the most dense.
Density is the mass per unit volume. In all the options mass and volume are given but in different units, first convert volume into L, cm3 or ml and mass to g or kg and then we can calculate the density by using the formula:
Density = Mass / Volume

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Which of the following does not affect the electrical resistance of a body?

Nastasia [14]

D. Bodies directly surrounding the body

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3 years ago

What type of reaction is CH 4 (g)+2O 2 (g) CO 2 (g)+2H 2 O(g)

tangare [24]

Answer: combustion

Explanation:

Combustion reactions can be identified by looking at the reactants and the products.

Usually, the reactants will be a hydrocarbon and oxygen. And the products will be CO2 and H2O

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3 years ago

Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+, V5+, Br-

Jet001 [13]

Answer:

CaS, CaBr₂, VBr₅, and V₂S₅.

Explanation:

The ionic compound should be neutral; the overall charge of it is equal to zero.

Binary ionic compound is composed of two different ions.

Ca²⁺ can combined with either Br⁻ or S²⁻ to form binary ionic compounds.

CaS can be formed via combining Ca²⁺ with S²⁻ to form the neutral binary ionic compound CaS.

CaBr₂ can be formed via combining 1 mole of Ca²⁺ with 2 moles of Br⁻ to form the neutral binary ionic compound CaBr₂.

V⁵⁺ can combined with either Br⁻ or S²⁻ to form binary ionic compounds.

V₂S₅ can be formed via combining 2 moles of V⁵⁺ with 5 moles of S²⁻ to form the neutral binary ionic compound V₂S₅.

VBr₅ can be formed via combining 1 mole of V⁵⁺ with 5 moles of Br⁻ to form the neutral binary ionic compound VBr₅.

So, the empirical formula of four binary ionic compounds that could be formed is: CaS, CaBr₂, VBr₅, and V₂S₅.

5 0

3 years ago

Which are the product(s) of this chemical reaction? FeCl 3 + 3NH 4OH ->

Vinvika [58]

The answer is D

FeCl3 + 3 NH4OH → Fe(OH)3 + 3 NH4Cl

5 0

2 years ago

White vinegar is a 5.0% by mass solution of acetic acid in water. If the density of white

Alex_Xolod [135]

The pH = 2.41

<h3>Further explanation</h3>

Given

5.0% by mass solution of acetic acid

the density of white vinegar is 1.007 g/cm3

Required

Solution

Molarity of solution :

$\tt M=\dfrac{\%mass\times \rho\times 10}{MW~acetic~acid}\\\\M=\dfrac{5\times 1.007\times 10}{60}\\\\M=0.839$

Ka for acetic acid = 1.8 x 10⁻⁵

[H⁺] for weak acid :

$\tt [H^+]=\sqrt{Ka.M}$

Input the value :

$\tt [H^+]=\sqrt{1.8\times 10^{-5}\times 0.839}\\\\(H^+]=0.00388=3.88\times 10^{-3}\\\\pH=3-log~3.88=2.41$

7 0

3 years ago

Of the objects below, ________ is the most dense. Of the objects below, ________ is the most dense.

Of the objects below, is the most dense. Of the objects below, is the most dense.