CHEMISTRY MIDDLE SCHOOL

The center of an atom is called the

Answers

Answer 1
Answer: The center of an atom is called the nucleus where the protons and neutrons are.  Hope it helps!! 

Related Questions

How many grams are there in 7.4 x 1023 molecules of H2SO4?
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How can a neutral atom become a positively-charged particle?OA. It could lose protons.B. It could lose electrons.C.It could gain neutrons.D.It could gain ions.
When two or more substances combine, but each keeps its own properties, what is the new combination called A) Element B) Mixture C) Compound D) Homogeneous substance
Which of the following best describes a mixture? *two or more substances combine and cannot be separatedtwo or more substances combine chemicallytwo or more substances combine but keep their physical propertiestwo or more substances combine and create an irreversible reaction

Is the Coriolis effect caused by the jet stream.

Answers

YES!!!!!!!!!!!!!!!!!!!!!

Which of these was most important in forming the solar system A-darkness
B-evaporation
C-cooling
D-gravity

Answers

D. Gravity because the solar system wouldn’t stay together without the gravity pulling the planets together.

How might radar images help to reduce damage from an approaching storm?

Answers

They let the meteorologist know how bad the storm is

The cell wall is a rigid structure that surrounds plant cells. The materials found in the cell wall protect the plant cells and give plants structural support.Which conclusion can be made given the above information?
The structures of different types of cell organelles are similar.

The functions of most cell organelles are hindered by their structures.

The structure of a cell organelle is directly related to its function.

The function of a cell organelle can change over time.

Answers

Answer:

The correct answer will be option- The structure of a cell organelle is directly related to its function.

Explanation:

The cell wall is a layer formed around the plasma membrane of the plant cell which helps plant cell by providing stiffness and support to the cell. This cell wall provides protection to the plant cells.

Since the presence of cell wall around the plasma membrane shows that it has a specific function and serves an important function of the plant cell, similarly the structure of various organelles present in the cell is related to their function. The best-known example is the inner folding of the mitochondria called cristae to increase the surface area.

Thus, the selected option is the correct answer.
The structure of a cell organelle is directly related to its function because for example, us. Humans have cells throughout their body. In fact, these cells are all the same. But these cells don't perform the same tasks or else we wouldn't be able to walk, sleep, talk, breath, and bend the way we do.

This reaction is an explosive reaction of a strong acid combining with a strong base.H2SO4 + 2NaOH → 2H2O + Na2SO4

Which compounds are the reactants and which are the products?

A.
reactants: H2SO4 + 2NaOH
products: 2H2O + Na2SO4

B.
reactants: 2NaOH + Na2SO4
products: H2SO4 + 2H2O

C.
reactants: 2H2O + Na2SO4
products: H2SO4 + 2NaOH

D.
reactants: H2SO4 + 2H2O
products: 2NaOH + Na2SO4

Answers

A) reactants: H2SO4 + 2NaOH and products: 2H2O + Na2SO4
The reactants are found on the left side of the equation, before the arrow.
The products are found on the right side of the equation, after the arrow.

Answer:

A. Reactants: H2SO4 + 2NaOH

products: 2H2O + Na2SO4

Explanation:

How many grams of chloride ions are in 8.3 g of copper (II) chloride

Answers

4.4\; {\rm g}.

Explanation

Refer to a modern periodic table for relative atomic mass:

  • Cu- 63.546;
  • Cl- 35.45.

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = 134.446\; {\rm g \cdot mol^(-1)}.

How many {\rm mol} of formula units in 8.3 grams of CuCl₂?

(8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^(-1)}) \approx 0.0617\; {\rm mol}

Note the subscript "2" in the formula CuCl₂. There are 2\; {\rm mol} of chloride ions in every 1\; {\rm mol} formula unit of CuCl₂.

There would be 2 * 0.0617\; {\rm mol} \approx 0.123\; {\rm mol} of {\rm Cl^(-)} ions in 0.0617\; {\rm mol} formula units of CuCl₂.

The mass of 1\; {\rm mol} of chloride ion is 35.45 grams.

The mass of 0.123\; {\rm mol} of {\rm Cl^(-)} ions will be 35.45 * 0.123 \approx 4.4\; {\rm g}.

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

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