CHEMISTRY MIDDLE SCHOOL

How long would it take for an 88.0 gram sample to decay to only 5.50 grams if it has a half-life of 16.4 seconds?

Answers

Answer 1

Answer:

Answer:

The answer is 65.6 secs.

Answer 2

Answer:

Answer: 65.23

Explanation:

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What are the uses of methanol?

What determines the life cycle of a star

Answers

Hi There! :)

What determines the life cycle of a star?

A star's life cycle is determined by its mass.

HClO4+P4O10=H3PO4+Cl2O7 how do you balance this?

Answers

12 HClO₄ + 1 P₄O₁₀ → 4 H₃PO₄ + 6 Cl₂O₇

Explanation

Balance by the conservation of atoms.

Assign coefficient 1 to the species with the largest number of elements and atoms. H₃PO₄ contains three elements. Each of its molecule contains eight atoms, that's two more than the six atoms in a HClO₄ molecule. Start by assigning H₃PO₄ a coefficient of 1.

? HClO₄ + ? P₄O₁₀ → 1 H₃PO₄ + ? Cl₂O₇

There are now three H atoms, one P atom on the product side. H₃PO₄ is the only product that contains H and P atoms. As a result, there should be the same number of H and P atoms on the reactant side.

Among all reactants, only HClO₄ contains H atoms. Each HClO₄ molecule contains one H atom. Three H atoms correspond to three HClO₄ molecule.
Among all reactants, only P₄O₁₀ contains P atoms. Each P₄O₁₀ molecule contains four P atoms. One P atom corresponds to 1/4 of a P₄O₁₀ molecule.

Thus

3 HClO₄ + 1/4 P₄O₁₀ → 1 H₃PO₄ + ? Cl₂O₇

There are three Cl atoms in three HClO₄ molecules. HClO₄ is the only species that contains Cl among all reactants. There are three Cl atoms on the reactant side and shall be the same number of Cl atoms on the product side.

Cl₂O₇ is the only molecule that contains Cl among the products. Each Cl₂O₇ molecule contains two Cl atoms. Three Cl atoms will correspond to 3/2 Cl₂O₇ molecules.

3 HClO₄ + 1/4 P₄O₁₀ → 1 H₃PO₄ + 3/2 Cl₂O₇

Multiply both sides by the least common multiple of the denominators to eliminate the fraction. Theleast common multiple in this case is four.

12 HClO₄ + 1 P₄O₁₀ → 4 H₃PO₄ + 6 Cl₂O₇

Why do elements in a group on the periodic table have similar chemical properties? A.
same number of outermost electrons

B.
same number of protons

C.
similar atomic masses

D.
similar atomic numbers

Answers

do elements in a group on the periodic table have similar chemical properties because their atoms have the same number of electrons

A. same number of outermost electrons

A bacterium is in a nasty environment. What sort of reproduction would it use in this situation? Why? How else would it protect itself? (hint: what were those special capsules called and why were they special?)

Answers

The bacteria in nasty environment undergoes multiple fission.

Explanation:

The bacteria is a unicellular prokaryotic organisms that are found in each and every places of the world. They can survive in extremes of temperatures and pH. They can save themselves through special processes in the extreme climates.

The bacteria undergoes multiple fission in these climates. They cover themselves up with a strong and tough capsule inside which they undergo several Binary fissions. This leads to the formation of multiple cells enclosed with a capsule.

With the return of the favourable climate, the capsule rupture and these newly formed cells come out.

What type of lava/magma is in Galeras volcano

Answers

Galeras Volcano is located near Pasto, Colombia. It is a Complex volcano. In other words, it is a volcano with more than one feature. Galeras has a B-Type lava/magma

100111111000010100101010011101001001010101001010101001101010010

101010100101111000001011110101001010100101001010101010Explanation:

What is the majority of 0.50 g of na dissolved in a 1.5 L solution