CHEMISTRY HIGH SCHOOL

Changing the pressure of a system has the highest effect on a substance in which phase?a. gas
b. solid
c. liquid
d. plasma

Answers

Answer 1
Answer: The best answer to the question presented above would be letter a. Changing the pressure of a system has the highest effect on a gaseous phase. Solids and liquids under pressure make little difference, while gas molecules have many behaviors due to change in pressure.

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Given the equation: 2Na + 2H2O → 2NaOH + H2 Which substance in this equation is a binary compound?

Answers

Answer: In the following equation, H_2O is considered as a binary compound.

Explanation: A binary compound is considered as a compound having 2 elements only. In the following chemical equation:

2Na+2H_2O\rightarrow 2NaOH+H_2

There are 2 compounds present because compound is defined as the chemical combination of two or more elements in a fixed ratio.

In the equation, compounds are: H_2O and NaOH

H_2O consists of 2 elements which are hydrogen and oxygen and hence is considered as a binary compound.

NaOH consists of 3 elements which are sodium, hydrogen and oxygen and hence, cannot be considered as a binary compound.

Which diagram below shows the pathway of energy through an ecosystem? A.producer → carnivore → herbivore

B.producer → herbivore → carnivore

C.herbivore → producer → carnivore

D.carnivore → herbivore → producer

Answers

the answer is B. producer,herbivore, carnivore 

Help please more points1 Change 9.0 x 10^7 from scientific to standard notation


2 Change 3.2 x 10^-5 from scientific to standard notation


3 Which types of measurements are appropriate for scientific notation? *


The speed of light

The speed of a snail

The speed of your car


4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.


5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units


6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

Answers

Answer:

The answers are below

Explanation:

1.-  Change 9.0 x 10^7 from scientific to standard notation

Just move the decimal point 7 places to the right

                 90000000

2 Change 3.2 x 10^-5 from scientific to standard notation

Just move the decimal point 5 places to the left

              0.000032

3 Which types of measurements are appropriate for scientific notation? *

The speed of light                  is appropriate

The speed of a snail               isn't appropriate

The speed of your car            isn't appropriate

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

Just move the decimal point 11 places to the right

                       3.72 x 10 ⁻¹¹ grams     =  3.72 x 10 ⁻¹⁴ kg

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

Just move the decimal point 10 places to the left

             4.5 x 10 ¹⁰ km = 4.5 x 10¹³ m

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

I think the digital thermometer is more precise because it can measure decimals, then the reading is closer to the right temperature. The other thermometer can't read decimals.

A physical change is __________ if energy is given off.Select one:
a. exothermic
b. endothermic
c. a chemical change
d. not possible

Answers

Answer:

A

Explanation:

In the equation PbO2 + 4HCl → 2H2O + PbCl2 + Cl2, how many electrons are transferred? A. 1 B. 2 C. 3 D. 4

Answers

The answer is NOT 4... I took the test!
PbO2+2e ->Pb^2+
2Cl^- ->Cl2+2e
so 2e are transferred

When might a large volume of material have little mass

Answers

A large volume of material will have a small amount of mass when thematerial in question is gaseous or porous, and therefore has a lot ofspace within it despite taking up a large amount of space overall.
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