CHEMISTRY HIGH SCHOOL

A roller coaster car is traveling down a track at 22 m/s. The car has a mass of 2000 kg. What is the Kinetic energy of the car? A) 22,000 J
B) 968,000 J
C) 484,000 J
D) 44,000 J

Answers

Answer 1
Answer:

The kinetic energy of the car is 484000 J

Explanation:

Given

Velocity = 22 m/s

Mass = 2000 kg

To Find:

Kinetic energy of the car= ?

Solution:

Kinetic energy of the car  is given by

Where

m= mass of the car

v= velocity  

KE = kinetic energy

So, substituting the values

tex]KE = \frac{1}{2}\times(2000*22^2)[/tex]

KE = 484000 J

Answer 2
Answer:

I found out the correct answer! All you have to do is plug in the numbers 2000 into m and 22 into v. In the equation: x = 1/2 * m * v^2 Where x equals kinetic energy. So the answer is C)


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MIDDLE SCHOOL

Organize the following metals from least metallic to most metallic :barium,zinc,iron, and strontium

Answers

Zinc, Iron, Strontium, Barium

Answer:

Zinc, Iron, Strontium, Barium

Explanation:

HIGH SCHOOL

Which of the following is the best definition of a mixture? combination of more than one kind of substance

two elements chemically bonded

two elements of different types forming either an ionic or covalent bond


Solubility is the same for all substances, regardless of what they are made of.

True

False


Water can dissolve many substances because it has an overall negative charge, allowing it to attack positively-charged ions.

True

False

Answers

2 elements of different types forming either an ionic or covalent bond

true

false
HIGH SCHOOL

On a cool morning, Uyen’s breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen seeing her breath in this way? melting and condensation vaporization and condensation sublimation and deposition condensation and sublimation

Answers

The correct option is: VAPORIZATION AND CONDENSATION.

Matters have the ability to change from one state to another state, this is called state transition. In the question given above, the carbon dioxide, which Uyen's was breathing out came in form of vapors and forms a cloud by condensing. Condensation is the process by which water droplets are formed when a vapor from comes in contact with cold surfaces. In the question given above, the vaporized gas condenses when it comes in contact with the humid air.


The correct answer is vaporization and condensation.

When we breathe out on cold morning, the moisture in our breathe vaporizes, then the cold air outside condenses the water vapor into tiny droplets of liquid water and ice. We see this as clouds.

The outside cold temperature is very important for this condensation process to occur.

MIDDLE SCHOOL

Describe the formation of a chloride ion

Answers

it is formed when the element chlorine gains an electron or when a compound such as hydrogen chloride is dissolved in water

It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents. Chloride salts such as sodium chloride are often very soluble in water.
MIDDLE SCHOOL

Assuming all volume measurements are made at the same temperature and pressure how many liters of carbon dioxide gas can be produced 12.8 L of oxygen gas react with excess carbon monoxide

Answers

Answer:

25.6 liters of will be produced.

Explanation:

We are given that 12.8 liters of Oxygen gas is reacted with excess Carbon Monoxide to produce of Carbon Dioxide gas, keeping all the volume measurements at the same temperature.

We are to find the number of liters of Carbon Dioxide used in the reaction.

The equation for this reaction will be:

From the equation, we can see that the mole ratio of Oxygen to Carbon Dioxide is 1:2. Therefore, the number of liters of will be double the number of liters of Oxygen.

So, 25.6 liters of will be produced.

25.6 L of carbon dioxide gas will be produced when 12.8 L of oxygen gas react with excess carbon monoxide. The stoichiometric ratio for oxygen gas and carbon dioxide gas is 1:2. For every mole of O2 consumed, 2 moles of CO2 are formed.

Further Explanation:

The balanced chemical equation for this reaction is:

O2 + 2 CO → 2 CO2

To get the amount of CO2 produced, the following steps must be followed:

  1. Convert the volume of O2 to moles O2.
  2. Get the number of moles of CO2 formed using the stoichiometric ratio 1 mole O2: 2 moles CO2
  3. Convert the moles of CO2 produced to liters

Solving the problem,

STEP 1: Convert liters to moles

STEP 2: Get the moles of CO2 formed

STEP 3: Convert moles to liters

Learn More

  1. Learn more about STP brainly.com/question/11676583
  2. Learn more about molar volume brainly.com/question/4172228
  3. Learn more about ideal gas law brainly.com/question/12968132

Keywords: stoichiometry, STP, gases

HIGH SCHOOL

Which of the following statements does not accurately describe Precambrian Earth? A.
The atmosphere was similar to that of early Mars and Venus.

B.
The oceans were chemically different from modern oceans.

C.
The ocean water was salty and rich in dissolved oxygen.

D.
There were large amounts of water in Earth’s mantle.

Answers

Answer:

C. The ocean water was salty and rich in dissolved oxygen.  

Explanation:

The oldest and longest of the Geological Ages, the Pre-Cambrian extends from the formation of the Earth, approximately 4.5 billion years ago, to 570 million years ago.

This period begins with the formation of the Earth about 4.5 billion years ago, where the Earth was an incandescent mass with rivers of dissolved rock, erupting volcanoes and large amount of sulfur. The atmosphere was initially similar to the atmosphere of Mars and Venus and was composed of nitrogen, ammonia, hydrogen, carbon monoxide, methane and water vapor, expelled by volcanoes, and no sign of oxygen.

After 700 million years, most of the rocks on the surface of the earth had already been cooled and a large amount of water had condensed into an ocean. Even so, the volcanic eruptions were still constant and were giving rise to several islands that were pushed toward each other by the movement of the mantle. In this period small unicellular beings in the ocean begin to appear, the primitive algae and bacteria that assimilate the carbon dioxide of the atmosphere transforming it into free oxygen, slowly changing the composition of the atmosphere that, in that period, was composed basically by nitrogen and steam of Water. They are of this period the oldest fossils of the earth.

c. the ocean water was salty and rich in dissolved oxygen

HIGH SCHOOL

Strands of RNA do NOT contain which of the following bases?a)adenine b)cytosine c)guanine d)thymine

Answers


Unlike DNA, RNA doesn't contain Thymine it contains Uracil

Answer:

thymine

Explanation:

MIDDLE SCHOOL

5.75 moles of H2 gas to liters at STP

Answers

5.75mol (22.4L/1mol) = 128.8L
HIGH SCHOOL

The hydrogen ion concentration of a vinegar solution is 0.00010 m. how is this concentration written in scientific notation? 1.0 10–5 m 1.0 10–4 m 1.0 104 m 1.0 105 m

Answers

1.0 x 10^-4 M would be the correct answer

Answer:

B .        1.0 x 10-4m

Explanation:

edge 2020

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