Question 9 of 10
What type of force slows down a skydiver?
A. Gravity
B. Friction
C. Air resistance
O D. Magnetic force

Answer:

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

Explanation:

Step 1: Write out unbalanced reaction

Fe₂O₃ + H₂SO₄ → Fe₂(SO₄)₃ + H₂O

Step 2: Balance

We need the same number of SO₄²⁻ on each side

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + H₂O

Now we need the same amount of H⁺ on each side

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

Answer:

0.3 grams

Explanation:

you need to convert mg to m, and in doing so, multiply your 300mg by 1000

Hope this helps

Answer:

its base of the number chlorine -37  

Explanation:

Answer:

Hi.

Explanation:

I like turtes.

Answer:

Hi everyone

Explanation:

Answer:

A. Nasal cavity, pharynx, larynx, lungs

Explanation:

The nasal cavity, is the nose, the pharynx is the lining between nose and mouth, larynx is the passage that goes down to the lungs

Answer:u would have 30 grams in it

Explanation:cause u have 12 grams in each mole

Answer:

Chemistry is another word for science just  higher level.the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.

Explanation:

Answer:

Chemistry is a branch of science.

Answer:

Iconic

Explanation:

hope this helps :) x

Answer: frying egg

Explanation:

Answer:

Number of atoms = 5.1345 x 10²³

Explanation:

Given:

Mass of sodium = 19.6

Find:

Number of atoms

Computation:

We know that atomic mass of sodium is 22.98

So,

Number of atoms = [Mass of sodium/atomic mass of sodium]Avogadro's number

Number of atoms = [19.6 / 22.98]6.02 x 10²³

Number of atoms = 5.1345 x 10²³

Answer:

B-they have different dimensions

Explanation:

It was explicitly stated in the question that the both samples are exactly pieces of the same metal. If that is so, pieces of the same metal must have the same density, contain the same quantity of matter, have the same boiling point and have the same amount of matter per unit volume.

However, the two pieces of metal may have different dimensions.

Popcorn and salt as the mixtures are substances which are formed by mixing other substances

Answer:

Time taken 172.8 years

Explanation:

Given data:

Total amount of strontium-90 = 1000.0 g

Amount left = 15.625 g

Half life of strontium = 28.8 years

Time taken = ?

Solution:

Number of half lives:

At time zero = 1000.0 g

At first half life = 1000.0g/2 = 500 g

At second half life = 500 g/2 = 250 g

At third half life = 250 g/ 2 = 125 g

At 4th half life = 125 g/ 2= 62.5 g

At 5th half life = 62.5 g/2 = 31.25 g

At 6th half life = 31.25 g / 2 = 15.625 g

Time taken:

Time taken = number of half lives × half life

Time taken = 6×28.8 years

Time taken = 172.8 years

Answer:

the standard unit of radiation related to biological hazards is known as the Roentgen.

Explanation:

Answer:

include quartzite and marble

Explanation:

non-foliated rocks are

1. metamorphic rocks

2. they are formed in the surrounding of igneous rocks

3. The environmental condition of formation of non-foliated rocks are that temperature is very high

4. pressure is very low but equal from all direction on igneous rocks

5. The constituent material crystalizes to form large rocks in which atoms are tightly and closely packed. Due to this density of these rocks are also higher.

Example of such rocks are

Quartzite : Its  constituent material are mineral quartz and metamorphosed sandstone

Marble : its constituent material are mineral calcite; metamorphosed limestone

Hence, include quartzite and marble is the correct choice.

Answer:

include quartzite and marble

Explanation:

Answer:

Nucleus

The nucleus can be thought of as the cell’s headquarters. There is normally one nucleus per cell, but this is not always the case, skeletal muscle cells, for instance, have two. The nucleus contains the majority of the cell’s DNA (a small amount is housed in the mitochondria, see below). The nucleus sends out messages to tell the cell to grow, divide, or die.

Plasma membrane

To ensure each cell remains separate from its neighbor, it is enveloped in a special membrane known as the plasma membrane. This membrane is predominantly made of phospholipids, which prevent water-based substances from entering the cell. The plasma membrane contains a range of receptors, which carry out a number of tasks, including being:

Gatekeepers: Some receptors allow certain molecules through and stop others.

Markers: These receptors act as name badges, informing the immune system that they are part of the organism and not a foreign invader.

Communicators: Some receptors help the cell communicate with other cells and the environment.

Fasteners: Some receptors help bind the cell to its neighbors.

Cytoplasm

The cytoplasm is the interior of the cell that surrounds the nucleus and is around 80 percent water; it includes the organelles and a jelly-like fluid called the cytosol. Many of the important reactions that take place in the cell occur in the cytoplasm.

Lysosomes and peroxisomes

Both lysosomes and peroxisomes are essentially bags of enzymes. Lysosomes contain enzymes that break down large molecules, including old parts of the cells and foreign material. Peroxisomes contain enzymes that destroy toxic materials, including peroxide.

Cytoskeleton

The cytoskeleton can be considered the scaffolding of the cell. It helps it maintain the correct shape. However, unlike regular scaffolding, the cytoskeleton is flexible; it plays a role in cell division and cell motility — the ability of some cells to move, such as sperm cells, for instance.

The cytoskeleton also helps in cell signaling through its involvement in the uptake of material from outside the cell (endocytosis) and is involved in moving materials around within the cell.

Endoplasmic reticulum

The endoplasmic reticulum (ER) processes molecules within the cell and helps transport them to their final destinations. In particular, it synthesizes, folds, modifies, and transports proteins.

The ER is made up of elongated sacs, called cisternae, held together by the cytoskeleton. There are two types: rough ER and smooth ER.

Golgi apparatus

Once molecules have been processed by the ER, they travel to the Golgi apparatus. The Golgi apparatus is sometimes considered the post office of the cell, where items are packaged and labeled. Once materials leave, they may be used within the cell or taken outside of the cell for use elsewhere.

Mitochondria

Often referred to as the powerhouse of the cell, mitochondria help turn energy from the food that we eat into energy that the cell can use — adenosine triphosphate (ATP). However, mitochondria have a number of other jobs, including calcium storage and a role in cell death (apoptosis).

Ribosomes

In the nucleus, DNA is transcribed into RNA (ribonucleic acid), a molecule similar to DNA, which carries the same message. Ribosomes read the RNA and translate it into protein by sticking together amino acids in the order defined by the RNA.

Answer:

One can conclude that the metal is an alloy.

Explanation:

An alloy is a combination of metal that has two or more elements. Different metals are usually combined to give it more strength or make it more resistant to corrosion.

Cheers!

Answer: electrons are arranged in shells around an atom's nucleus.

Explanation:

Answer:

doesn’t make sense coffee couldn’t make you shorter , yes it might stop you from growing but it doesn’t shrink your body.

Explanation:

Because coffee is made out if coffee beans and has caffeine but theres just no possible way that’s even a question.

5 electrons

Boron atomic number 5 has five electrons in its ground state.

Commonly Boron will lose 3 electrons leaving 2 electrons in its most common ionic form.

Explanation:

The atomic number gives the number of protons. Protons which have a positive charge are balanced by an equal number of electrons in a neutral atom.

Boron number 5 has five protons and therefore as a neutral atom also has five electrons.

Boron has an electron configuration of

1s22s22p1

The most stable electron configuration for Boron is

1s2

+ 3 charges. By losing three electrons Boron can achieve the stable electron structure of Helium

Brainliest? :D

Answer:

12 g/cm³

Explanation:

From the question given above, the following data were obtained:

Dimension = 10 cm × 1 cm × 2 cm

Mass = 240 g

Density =.?

Next, we shall determine the volume of the rectangular prism. This can be obtained as follow:

Volume = 10 cm × 1 cm × 2 cm

Volume = 20 cm³

Finally, we shall determine the density of the rectangular prism as follow:

Mass = 240 g

Volume = 20 cm³

Density =.?

Density = mass /volume

Density = 240 /20

Density = 12 g/cm³

Therefore, the volume of the rectangular prism is 12 g/cm³.

Answer:

B- cooled quickly

Explanation:

credit to the person above me :)

An igneous rock has a coarse texture and is dark in color. The rock can be accurately described as cooled quickly.

Rock are defined as a natural substance made up of crystalline crystals of various minerals fused together to form a solid mass.

It is also defined as any naturally occurring mineraloid substance or solid bulk.

There are basically three types of rock.

Thus, an igneous rock has a coarse texture and is dark in color. The rock can be accurately described as cooled quickly.

To learn more about rock, refer to the link below:

https://brainly.com/question/19930528

#SPJ5

Answer:

Explanation:

Consider the motion of a Hot Wheels car beginning from rest at an elevated position. The Hot Wheels car rolls down a hill and begins its motion across a level surface. Along the level surface, the Hot Wheels car collides with a box and skids to a stop over a given distance. How could work and energy be utilized to analyze the motion of the Hot Wheels car? Would the total mechanical energy of the Hot Wheels car be altered in the process of rolling down the incline or in the process of skidding to a stop? Or would the total mechanical energy of the Hot Wheels car merely be conserved during the entire motion?

Of course the answers to these questions begin by determining whether or not external forces are doing work upon the car. If external forces do work upon the car, the total mechanical energy of the car is not conserved; the initial amount of mechanical energy is not the same as the final amount of mechanical energy. On the other hand, if external forces do not do work upon the car, then the total mechanical energy is conserved; that is, mechanical energy is merely transformed from the form of potential energy to the form of kinetic energy while the total amount of the two forms remains unchanged.

While the Hot Wheels car moves along the incline, external forces do not do work upon it. This assumes that dissipative forces such as air resistance have a negligible affect on the car's motion. This is a reasonable assumption for the low speeds of the car and its streamline characteristics. Since external forces do not do work on the car, the total mechanical energy of the car is conserved while moving along the incline. As the work-energy bar charts in the animation below depict, energy is transformed from potential energy (the stored energy of position) to kinetic energy (the energy of motion). The car gains speed as it loses height. The bar chart also depicts the fact that the total amount of mechanical energy is always the same; when the two forms are added together, the sum is unchanging.

When the Hot Wheels car collides with the box and skids to a stop, external forces do a significant amount of work upon the car. The force of friction acts in the direction opposite the car's motion and thus does negative work upon the car. This negative works contributes to a loss in mechanical energy of the car. In fact, if 0.40 Joules of mechanical energy are lost, then -0.40 Joules of work are done upon the car. As this work is done, the mechanical energy of the car (in the form of kinetic energy) is transformed into non-mechanical forms of energy such as sound and heat.

Answer:

Volume = 35.2×220×6.0 = 46464 centimeters³

Explanation:

Answer:

the basic unit of an ionic compound is called a formula unit and the basic unit of a covalent compound is a molecule.