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3 years ago

Give the nuclear symbol (isotope symbol) for the isotope of bromine, Br, that contains 46 neutrons per atom.

1 answer:

5 0

Bromine has 35 protons, and in this case 46 neutrons, so 35 + 46 = 81
Therefore, the symbol is (subscript 35)(superscript 81) Br.

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C. Graphite is used as lubricant.

Vedmedyk [2.9K]

Answer:

is this the question?please

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3 years ago

Ragav: is it a part of a living being? Sophie: yes it is Ragav: Is that living being an animal? Sophie: No, it's not. Ragav: doe

erma4kov [3.2K]

Answer: D. Roots

Explanation:

Sophie said that the part in question does not belong to an animal. This therefore invalidates options B and C as only animals would have lungs or legs.

Sophie then says that the part does not grow in the direction of light so that removes stems as the correct option because stems grow towards light in order to allow leaves to carry out photosynthesis.

Roots on the other hand grow towards gravity so they grow away from light which means that the correct answer is roots.

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3 years ago

In the reaction MgCl2 + 2KOH Mg(OH)2 + 2KCl, how many moles of Mg(OH)2 are produced for every mole of MgCl2?. A. 3. B. 1. C. 2.

aksik [14]

Mole ratio:

 MgCl₂ + 2 KOH = Mg(OH)₂ + 2 KCl

1 mole MgCl₂ -------------- 1 mole Mg(OH)₂

Answer B

hope this helps!

4 0

3 years ago

Read 2 more answers

Atom , classify it helppoppppoeowiie

timama [110]

Answer:

A atom is a small unit to which matter can be divided without releasing electrically charged particles

Explanation:

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2 years ago

What is meant by the term chemical reaction

pantera1 [17]

Answer:

<h3> $\huge{ \underline{ \underline { \bold{ \sf{ \orange{See \: below}}}}}}$ </h3>

Explanation:

▪️ $\underline{ \bold{ \sf{ \blue{Chemical \: reaction}}}}$

⇒The composition , decomposition or displacement of molecules of matter during chemical change is called chemical reaction.

▪️ $\underline{ \bold{ \sf{ \purple{ \: Further \: more \: explanation}}}}$

Various conditions bring about these changes. The chemical reactions are represented by chemicalequation. The compounds or elements that take part in chemical reaction are called reactant. They are written at the left side of an arrow that represent a change while the compound or elements that formed after the chemical change are called product. They are written at the right side of the arrow.

▪️ $\underline{ \bold{ \sf{ \purple{For \: example}}}}$

When nitrogen reacts with hydrogen to form ammonia :

Nitrogen + Hydrogen ⇒ Ammonia

N₂ + 3H₂ ⇒ 2NH₃

Presentation of a chemical reaction in the form of equation is called chemical equation . Chemical equation may be word equations or formula equations.

Hope I helped!

Best regards!!

3 0

2 years ago