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4 years ago

7

For a research project on time management hearing is to calculate how many hours the average high school student spends in schoo

l each year which of these dimensional analyst equations is the correct one for him to use

2 answers:

ivolga24 [154]4 years ago

3 0

Answer: it’s b

Explanation:

Sveta_85 [38]4 years ago

3 0

Answer:

2nd option On edgenuity

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1. when energy increases, amplitude _________.

Ghella [55]

Answer:

1. decreases

2. Transverse

3. Vibrations

5 0

3 years ago

Calculate the mass of 3.4 moles of nitrous acid (HNO2). Explain the process or show your work by including all values used to de

Zina [86]

Answer:

Mass = 159.8 g

Explanation:

Given data:

Mass of HNO₂ = ?

Moles of nitrous acid = 3.4 mol

Solution:

Formula:

Number of moles = mass / molar mass

We will rearrange this formula.

Mass = number of moles × molar mass

Molar mass of nitrous acid = 47 g/ mol

Mass = 3.4 mol × 47 g/ mol

Mass = 159.8 g

8 0

3 years ago

Arrange the bromine-containing compounds CaBr2, Br2, NBr3, CBr4 in order of increasing predicted boiling point.

Fudgin [204]

Explanation:

In an ionic compound, there will be strong force of attraction between the combining atoms due to the opposite charges present on them.

For example, $CaBr_{2}$ is an ionic compound where calcium has a +2 charge and each bromine atom has a -1 charge.

Therefore, in order to break the bond we need to provide more heat. Hence, boiling point of calcium bromide will be the highest.

$NBr_{3}$ is a covalent compound and as nitrogen is more electronegative in nature and also has a lone pair of electron hence, there will be a net dipole moment.

$CBr_{4}$ is also a covalent compound. And, as bromine is more electronegative than carbon atom so, dipole moment is in the outwards direction. Hence, in $CBr_{4}$ there will be zero dipole moment.

Therefore, its boiling is less than the boiling point of $NBr_{3}$ .

$Br_{2}$ is a covalent compound and there will be no dipole moment.

Thus, we can conclude that given bromine-containing compounds are placed in their increasing boiling point order as follows.

$Br_{2}$ < $CBr_{4}$ < $NBr_{3}$ < $CaBr_{2}$

3 0

4 years ago

If 4.35 g of phosphoric acid are added to 5.25g of KOH, what is the percent yield of the reaction if only 3.15g of potassium pho

irina1246 [14]

We are given with
4.35 g Phosphoric acid
5.25 g KOH
3.15 g K3PO4 produced

The reaction is
H3PO4 + 3KOH => K3PO4 + 3H2O

First, convert masses into moles.
Then, determine the limiting reactant.
Next, determine the maximum amount of K3PO4 that can be produced from the limiting reactant.
Lastly, calculate the percent yield by dividing the actual amount produced by the theoretical amount produced.

5 0

3 years ago

Calculate the density of the aluminum cylinder with a diameter 0f 1.3 cm weighing 18 grams. Height of the cylinder is 5.2 Cm. Fi

Masja [62]

Answer:

Percent error = 3.7%

Explanation:

Given data:

Density of Al cylinder = ?

Weight of cylinder = 18 g

Diameter = 1.3 cm

Height = 5.2 cm

Actual density of Al = 2.7 g/cm³

Percent error = ?

Solution:

First of all we will calculate the volume of cylinder through given formula.

V = πr²h

r = diameter /2

V = 22/7 × (0.65 cm)²× 5.2 cm

V = 22/7 × 0.4225cm²× 5.2 cm

V = 6.89 cm³

Now we will calculate the density.

d = m/v

d = 18 g/ 6.89 cm³

d = 2.6 g/cm³

Percent error:

Percent error = measured value - actual value /actual value × 100

Percent error = 2.6g/cm³ - 2.7g/cm³ /2.7g/cm³ × 100

Percent error = 3.7%

Negative sign shows that measured or experimental value is less than actual value.

6 0

3 years ago