CHEMISTRY MIDDLE SCHOOL

What is the mass of the block of iron illustrated below?

Answers

Answer 1

Answer:

Explanation:

Given that,

The dimensions of the block of iron is 2 cm, 10 cm and 5 cm

To find,

The mass of the block.

Solution,

We know that, the density of iron is, d = 7.874 g/cm³

Density, $d=(m)/(V)$

Where

m is mass and V is volume

Solving for m,

$m=d* V$

The block is in the form of a cuboid, $V=lbh$

So,

$m=d* l* b* h\n\nm=7.874 * 2* 10* 5\n\nm=787.4\ g$

Answer,

The mass of the block of iron is $787.4\ g$ .

Reference,

brainly.com/question/5189059

Answer 2

Answer:

Answer : 787.4 g

Explanation : With the given information; the volume of the block will be equal to = 5 cm X 10 cm X 2 cm = 100 $cm^(3)$ .

Therefore, the volume will be100 $cm^(3)$ .

but density of iron is found to be $7.874 g/cm^(3)$

So, now calculating for mass; on the basis of the density formula;

which is density = mass/volume; so, mass = density X volume;

Therefore, mass will be 7.874 g X 100 = 787.4 g

mass of the iron block = 787.4 g

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List 3 ways that scientists investigate and learn about the natural world?

Answers

3 ways that scientists investigate and learn about the natural world would include:
- Experimenting
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What is the formula for photo synthesis

Answers

6CO2 + 6H20 + (energy) → C6H12O6 + 6O2

aka

Carbon dioxide+water+energy(from light)=glucose and oxygen

Answer:Image result for What is the formula for photosynthesis

The Photosynthesis Equation. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen.

Both sides pull with unequal force

Answers

I don't understand what u are trying to say in this question but when two forces r not equal it is an unbalanced force. The item or objet will move whereas in a balanced force both sides r equal and the item or object will not move. I learned this in science.

If youre asking what will happen the side with the stronger force will pull it farther than the lighter force side

Give the masses of the three most abundant Cl2O molecules

Answers

Mass is the quantity of matter present in a substance. The masses of the most abundant molecule of $\rm Cl_(2)O$ are 85.9325, 87.9296, and 89.9267 amu.

What are isotopes?

Isotopes are the elements of the same species with the same atomic number but differ in atomic mass and physical properties.

% abundance and mass of chlorine are:

Cl-35 = 34.9688 amu

Cl-37 = 36.9659 amu

% abundance and mass of oxygen are:

O-16 = 15.9949 amu

O-17 = 16.9991 amu

O-18 = 17.9991 amu

O -16 is the most abundant form of the oxygen isotope and Cl -35 of chlorine.

The masses of the most abundant molecule are given as:

Cl-35, Cl-35, O-16:

$34.9688 \;\rm amu + 34.9688 \;\rm amu + 15.9949 \rm \;amu = 85.9325\;\rm amu$

Cl-35, Cl-37, O-16:

$34.9688 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 87.9296 \;\rm amu$

Cl-37, Cl-37, O-16:

$36.9659 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 89.9267 \;\rm amu$

Therefore, 85.9325, 87.9296, and 89.9267 amu are the masses of the most abundant form of the molecule.

Learn more about mass here:

brainly.com/question/5137820

Chlorine has the following % abundance and mass:

Cl-35 = 75.76 %, 34.9688 amu

Cl-37 = 24.24 %, 36.9659 amu

Oxygen has the following % abundance and mass:

O-16 = 99.757 %, 15.9949 amu

O-17 = 0.038 %, 16.9991 amu

O-18 = 0.205 %, 17.9991 amu

Based in the % abundance O-16 is the most abundant oxygen isotope and Cl-35 is the most abundant chlorine isotope

So the most abundant molecule of Cl2O and their respective mass are as follows:

1) Cl-35, Cl-35, O-16

Mass = 34.9688 amu + 34.9688 amu + 15.9949 amu = 85.9325 amu

2) Cl-35, Cl-37, O-16

Mass = 34.9688 amu + 36.9659 amu + 15.9949 amu = 87.9296 amu

3) Cl-37, Cl-37, O-16

Mass = 36.9659 amu + 36.9659 amu + 15.9949 amu = 89.9267 amu

An 80 kg long jumper in flight accelerates at a rate of 10 m/s^2. What is the force of the long jumper

Answers

Answer:

F = 800 N

Explanation:

Given data:

Mass = 80 Kg

Acceleration = 10 m/s²

Force = ?

Solution:

Formula:

F = m × a

F = force

m = mass

a = acceleration

Now we will put the values in formula:

F = m × a

F = 80 kg × 10 m/s²

F = 800 kg.m/s²

kg.m/s² = N

F = 800 N

What is the most important question to ask to determine whether a change is physical or chemical

Answers

The best question is WHAT and HOW