CHEMISTRY HIGH SCHOOL

How many significant digits are in the mass measurement 0.025 g? (a) 1 (B) 2 (c) 3 (d) 4 (e) none of the above

Answers

Answer 1
Answer: The answer is B. Only the 2 and the 5 are significant numbers.
Answer 2
Answer:

Final answer:

The measurement 0.025 g has two significant digits. Leading zeroes are not counted as significant.

Explanation:

The correct answer to the question is (b) 2. The number 0.025 g has two significant digits.

In Physics, a significant digit is any non-zero digit or any embedded or trailing zeroes in a number. Leading zeros, which are zeros at the beginning of a decimal number, are not considered significant digits. In the number 0.025 g, the leading zeros are not counted as significant because they only indicate the decimal place of the significant digits (in this case, the digits 2 and 5). Therefore, the number of significant digits is 2.

Learn more about Significant Digits here:

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What is the percent by mass of water in Na2SOa 10H20?total mass of element in compoundUse%Elementx 100molar mass of compoundO 5.59%O 11.26%44.08%O 55.92%

Answers

Molar mass Na₂SO₄. 10H₂O = 322.19 g/mol

Molar mass  H₂O = 18.0

% Element =  molar mass / total mass x 100

% Element = 18 / 322,19 x 100 

% Element =  5.59 %

Answer A

hope this helps!

Answer:

The answer is D.55.92%

Explanation:

Atoms in a stay in a fixed position and have no freedom to move.

Answers

If atoms stay in a fixed position that means they are a solid

An ideal gas _____. does not exist
perfectly obeys all gas laws
only exists at very low temperatures
only exists at very high pressures

Answers

THE ANSWERS ARE A AND B!!!!

HOPE I HELPED

Answer:

does not exist

perfectly obeys all gas laws

Explanation:

Ideal gases is a simplification of real gases that is made to study them more easily. Then a hypothetical or theoretical, that is to say, imaginary gas is considered ideal gases.   Despite not representing a gas that really exists,  the ideal gas is a tool to facilitate a large number of mathematical calculations

The ideal gas behavior is at low pressures and high temperatures.

The ideal gas equation is based condensing Boyle's law, Gay-Lussac's, Charles's and Avogadro's law:

P * V = n * R * T

where:

  • P = pressure
  • V = volume
  • n = number of moles
  • R = universal gas constant
  • T = temperature

In this way an ideal gas perfectly obeys all gas laws.

The halogens, the elements of Family 17 on the periodic table, combine easily with elements from Family 1. When a halogen reacts with a metal, what type of compound is formed? 1.potassium             2. alloys            3.noble gas             4.salt

Answers

4. salt
and example would be sodium chloride e.g. table salt

Answer:

got it right from study island

Explanation:

Which of the following is a radioisotope used to date rock formations older than 50,000 years?a. Carbon-14.
b. Uranium-235.
c. Cobalt-69.
d. Carbon-12.

Answers

You use uranium, carbon 14 half life is such that after 50000 years there won't be much left in the sample.

which of the following substances diffuses faster in a beaker filled with water  a drop of honey or drop of red ink

Answers

red ink since the substance is has a lower viscosity
red ink because it is more soluble in water than honey.
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