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Serga [27]
4 years ago
9

Mario places 10 mL of water in a test tube and heats the liquid over a Bunsen burner for 2 minutes. After removing the test tube

from the Bunsen burner, there are 6 mL of water left in the test tube. This experiment is a good example of a A. chemical change involving chemical reactions. B. physical change involving chemical reactions. C. physical change involving phase changes. D. chemical change involving phase changes.
Chemistry
2 answers:
Wittaler [7]4 years ago
5 0
The answer is c, hope this helps
Pie4 years ago
3 0
Look on Google it will explain
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The weight of the buggy was 40N on Mars. When the buggy landed on Mars it rested on an area of 0.025 m2. Calculate the pressure
elena-s [515]

Answer:

The pressure exerted by the buggy on the surface of Mars is 1600 pascals.

Explanation:

The pressure is determined by the definition of stress, which is the force exerted by the buggy on the martian surface divided by the contact area of the latter:

\sigma = \frac{F}{A}

Where:

\sigma - Stress, measured in pascals.

F - Force, measured in newtons.

A - Area, measured in square meters.

The force is the weight of the buggy (40 N) and A = 0.025\,m^{2}, the stress is now calculated:

\sigma = \frac{40\,N}{0.025\,m^{2}}

\sigma = 1600\,Pa

The pressure exerted by the buggy on the surface of Mars is 1600 pascals.

4 0
4 years ago
What is known as a double covalent bond?
DIA [1.3K]

Answer:

two atoms

Explanation:

6 0
3 years ago
Choose all the answers that apply.
SashulF [63]

Answer:

answer is 2 I think I'm correct sorry if I'm not

8 0
3 years ago
A gaseous mixture contains 5.0 moles of nitrogen and 10.0 moles of helium . What is the total pressure if the temperature is 25
jolli1 [7]

Answer:

A) 122 atm

Explanation:

PV = nRT

Solve for P --> P = nRT/V

n = 10.0 mol + 5.0 mol = 15.0 mol

R = 0.08206 L atm / mol K

T = 25 + 273 = 298 K

V = 3.0

P = (15.0)(0.08206)(298) / (3.0) = 122 atm

6 0
3 years ago
According to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in which order?
Scilla [17]

According to the IUPAC convention alkyl substituents on a hydrocarbon chain should be listed in alphabetical without considering prefixes order.

<h3>What is IUPAC convention?</h3>

IUPAC convention of organic chemistry is a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).

The name of the compound is written out with the substituents in alphabetical order followed by the base name (derived from the number of carbons in the parent chain).

Types of IUPAC  Nomenclature of a few important aliphatic compounds:

  1. Alkane
  2. Alkene
  3. Alkyne

Example :

Ethane, which has 2 carbon atoms and 6 hydrogen atoms, with the molecular formula of = C₂H₆

Formation of alkyl group:

Methane (CH₄)  Remove 1 hydrogen (H) convert to methyl (H₃-C-)

Example: Propyl (-CH₃ - CH₂ - CH₂ - )

According to the IUPAC convention alkyl substituents on a hydrocarbon chain should be listed in alphabetical without considering prefixes order.

Learn more about IUPAC convention, Here:

brainly.com/question/14706819

#SPJ4

8 0
2 years ago
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