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3 years ago

11

In the event no property damage or loss occurs during an insurance contract period, the premium payments were wasted only if the

policyholder

1 answer:

IRISSAK [1]3 years ago

5 0

...only if the policyholder would have preferred added risk over security.

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Write a net ionic equation for the overall reaction that occurs when aqueous solutions of hydrosulfuric acid (H2S) and sodium hy

vovangra [49]

Answer: 2NH4Br(aq)+Pb(C2H302(aq)-------------------->

2NH4C2H3o2(aq) + PbBr2(s)

Explanation:

The net equation is :Pb2+ (aq)2Br (aq)---------------------->PbBr2(s)

the spectator ions NH4 +C2H3O2 are canceled

6 0

3 years ago

Which statements about moon phases In a lunar month are true?

saveliy_v [14]

Answer:

1. The same pattern of phases repeats monthly

2. Waxing moon phases are visible between the new and full moon

6. A full moon appears toward the middle of a lunar month

Explanation:

Moon has eight phases which is used by the ancient people for the identification of date of the month. Phases of moon tells us about the starting, middle and end of the month. At the starting of the month, waxing crescent appears while at the middle of the month, the moon gains its full shape. Phases which occurs between new and full moon is known as waxing.

6 0

3 years ago

Iron has a density of 7.87 g/cm^3. What volume would 12.5 g of iron occupy?

Ilya [14]

Answer:

<h3>The answer is 1.59 cm³</h3>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass = 12.5 g

density = 7.87 g/cm³

We have

$volume = \frac{12.5}{7.87} \\ = 1.588310038...$

We have the final answer as

<h3>1.59 cm³</h3>

Hope this helps you

7 0

3 years ago

A 0.5895-g sample of impure magnesium hydroxide is dissolved in 100.0 mL of 0.2050 M HCl solution. The excess acid then needs 19

Zepler [3.9K]

Answer:

91.38 %

Explanation:

First we use the following formula to calculate the number of moles of HCl and NaOH contained in the solutions:

molar concentration = number of moles / solution volume

number of moles = molar concentration × solution volume

number of moles of HCl = 0.2050 × 100 = 20.5 mmoles

number of moles of NaOH = 0.1020 × 19.85 = 2.02 mmoles

reaction between NaOH and HCl:

NaOH + HCl → NaCl + H₂O

If 2.02 mmoles of NaOH were used for neutralization of HCl left from the reaction, which are 2.02 mmoles of HCl, it means that the HCl reacted with Mg(OH)₂:

20.5 - 2.02 = 18.48 mmoles of HCl

2 HCl + Mg(OH)₂ = MgCl₂ + 2 H₂O

From the chemical reaction we devise the following reasoning:

if 2 mmoles of HCl react with 1 mmole of Mg(OH)₂

then 18.48 mmoles HCl react with X mmoles of Mg(OH)₂

X = (18.48 × 1) / 2 = 9.24 mmoles of Mg(OH)₂

now the mass of Mg(OH)₂:

mass = number of moles × molecular weight

mass of Mg(OH)₂ = 9.24 × 58.3 = 538.7 mg = 0.5387 g

Now the percent by mass of magnesium hydroxide Mg(OH)₂ in the impure sample (purity):

purity = (mass of pure Mg(OH)₂ / mass of impure sample) × 100

purity = (0.5387 / 0.5895) × 100

purity = 91.38 %

7 0

3 years ago

If the NaOH is added to 35.0 mL of 0.167 M Cu(NO3)2 and the precipitate isolated by filtration, what is the theoretical yield of

Ghella [55]

Answer:

The correct answer is - 0.570 grams

Explanation:

The balanced chemical reaction is given by

Cu(NO3)2(aq) + 2NaOH(aq) --------> Cu(OH)2(s) + 2NaNO3(aq)

1.0 mole 2.0 mole 1.0 mole 2.0 mole

number of mol of Cu(OH)2,

n = Molarity * Volume

= $35.0*0.167 = 5.845$ millimoles

As clear in the equation, 1 mole of Cu(NO3)2 gives 1 mole of Cu(OH)2 , So, 5.845 millimoles of Cu(NO3)2 will produce 5.845 millimoles of Cu(OH)2

Mass of Cu(OH)2 = number of mol * molar mass

= $97.5*5.845*10^-3$

= 0.570 grams

Thus, the correct answer is - 0.570 grams

8 0

3 years ago