CHEMISTRY MIDDLE SCHOOL

Which of the following is true of an effective scientific model? A.)It seldom needs refining because of its detailed accuracy.
B.)It clearly depicts the particular set of characteristics being modeled.
C.)It is an exact visual representation of the characteristics being modeled.
D.)It is the same size and color as the scientific phenomena being demonstrated.

Answers

Answer 1
Answer: CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC IDK

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Which state of matter has the least amount of energy?
What does it mean if an experiment is replicable ? Why is it important that experiment be replicable
What properties you can observe or measure?
1. What is the volume of 0.900 moles of an ideal gas at 25.0° C and a pressure of 950.0 mm Hg?1.50 liters 17.6 liters 18.0 liters 34.2 liters2. What is the pressure, in mm Hg, of 2.50 moles of an ideal gas if it has a volume of 50.0 liters when the temperature is 27.0° C?  84.2 mm Hg  289 mm Hg  617 mm Hg  936 mm Hg3. When 12.4 grams of KBr are dissolved in enough water to create a 170-gram solution, what is the solution's concentration, expressed as a percent by mass?  6.2% KBr  6.8% KBr  7.3% KBr  7.9% KBr

Is the following sentence true or false. very few minerals are compound

Answers


false very few minerals are a compound

What are some examples of Radiation?

Answers

Examples of Everyday Radiation
Non-ionizing Radiation
Visible light
Infrared light
Near ultraviolet light
Microwaves
Low frequency waves
Radio waves
Waves produced by mobile phones
A campfire's heat
Thermal radiation
Extremely low frequency waves (3 - 30 Hz)
Very low frequency waves (3-30 kHz)
Power lines
Strong magnets
MRI
LEDs
Lasers
Light bulbs
Light from the sun
Remote controls
Cordless phones
Radio-frequency radiation such as televisions, FM and AM radio
Shortwave and CB's
Computer screens
Infrared lamps use to maintain food temperature in restaurants
Ionizing Radiation
Ultraviolet light
X-rays
Gamma-rays
Radioactive decay's particles
Cosmic rays
Alpha rays
Beta rays
Medical imaging equipment
Ionization of food
Sterilization of medical tools
Nuclear power production
Metal mining can result in exposure to ionizing radiation
Coal mining and power production from coal
Nuclear weapons
Galactic Cosmic Radiation (to which astronauts are exposed)
Solar Particle Event radiation (to which astronauts may be exposed)
Natural background radiation
Radiation therapy for specific forms of cancer
Radon
CT scans
Nuclear medical scans
X-Rays
Airport security scanners (in extremely high usage)
examples of radiation would be:

ultraviolet light from the sun.

heat from a stove burner.

light from a candle.

x-rays from an x-ray machine.
alpha particles emitted from the radioactive decay of uranium.

The type of graph that’s most useful for showing how one variable changes in response to another variable is called a _____?

Answers

The type of graph that’s most useful for showing how one variable changes in response to another variable is called a line graph. A line graph is used when you have one independent and one dependent variable. Usually, the independent variable is assigned to the x-axis, while the dependent variable is assigned to the y-axis.

Number 6



Yususueudidididifididi

Answers

The answer is predict, because it fits, and because someone can predict the outcome of something.

Combustion reaction all follow a similar pattern, complete the work equation below Hydrocarbon + ... ---> Carbon... + ....

Answers

Hydrocarbon + Oxygen    →    Carbon dioxide + Water

Compared to the physical and chemical properties of the compound NO2 the compound N2O has(1) different physical properties and different chemical properties

(2) different physical properties and the same chemical properties

(3) the same physical properties and different chemical properties

(4) the same physical properties and the same chemical properties

Answers

Answer: option (1) different physical properties and different chemical properties.


Justification:


1) Any chemical compound has its unique physical and chemical properties.


2) Although formed by the same elements, N and O, NO₂ and N₂O are different compounds, so each will have its proper physical and chemical properties.


3) The union of the atoms by chemical bonds confere the properties to a matter, so being the bonds in N₂O different to the bonds in N₂O means they are different compounds.
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