An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element? A. 30 protons, 30 electrons B. 15 protons, 15 electrons C. 60 protons, 30 electrons D. 30 protons, 0 electrons

Answers

Answer 1

Answer: Atomic number shows the number of protons in an atom's nucleus. If the atomic number is 30, then it has 30 protons. The question says it is neutral, so it must have the same amount of protons and electrons.

A is the correct answer based on this.

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How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2Sa. 2
b. 4
c. 8
d. 16

Answers

There are eight hydrogen atoms in the following molecule of ammonium sulfide. Thus, the correct option for this question is C.

What is a Molecule?

A molecule may be defined as a cluster of atoms that are significantly bonded together in order to represent the smallest basic unit of a chemical compound that can involve in a chemical reaction.

According to this question, the correct representation of ammonium sulfide is $(NH_4)_2S$ , where the number of the hydrogen atoms is equal to 4 × 2 = 8. Apart from this, the number of nitrogen atoms is 2. While the number of sulfur atoms is only 1.

Therefore, there are eight hydrogen atoms in the following molecule of ammonium sulfide. Thus, the correct option for this question is C.

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The are eight hydrogen atoms in ammonium sulfide because there are 2 molecules of ammonium.

The slope of a speed time indicates

Answers

The slope of a peed versus time graph indicates acceleration. You can prove this by the fact that slope is Δy/Δx and the units for y are m/s and for x are s which means that the slope has the units (m/s)/s which are the same units used for acceleration.
I hope this helps. Let me know in the comments if anything is unclear.

A color change happens during an experiment mixing two liquids. Is this a physical change or chemical change?

Answers

The color change would only effect the appearance of the substance, so it would be a physical change.

Answer: physical change

If you have 4 moles of zinc and 4 moles of hydrochloric acid, which of these would be the limiting reactant?

Answers

The balanced reaction between Zn and HCl is as follows:
Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g)
This means that HCl would be the limiting reactant.

D) Hydrochloric acid

Seriously help please??Assuming all of the atoms attached to the central atom were identical, which of the following geometries would produce a nonpolar molecule? (Only 3 choices are correct.)

-linear
-trigonal planar
-tetrahedral
-trigonal bipyramidal
-octahedral
-bent (angular)

Answers

Covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Linear, tetrahedral and trigonal planar geometries would produce a nonpolar molecule.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Using VSEPR and electron pair repulsion, we can easily find that linear, tetrahedral and trigonal planar geometries would produce a nonpolar molecule if we assume that all of the atoms attached to the central atom were identical. Any geometries which have center of symmetry will produce non polar molecule.

Therefore, linear, tetrahedral and trigonal planar geometries would produce a nonpolar molecule.

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Using VSEPR and electron pair repulsion, we can easily find that:

linear
tetrahedral
trigonal planar

are all non polar molecules.

4 Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have(1) less energy and the same charge
(2) less energy and a different charge
(3) more energy and the same charge
(4) more energy and a different charge

Answers

Moving the electron away from the nucleus requires energy, so the electrons in the outer shell will have more energy than ones in the inner shell. Electrons always have a charge of -1, so the charge in the inner and outer shell will be the same. Therefore the answer is 3

The electrons in the second shell of this atom have (3) more energy and the same charge compared to the first shell

Further explanation

Bohr's atomic model has shown the energy levels of electrons in the path of the atomic shell

The greater the value of n (the atomic shell, the main quantum number), the greater the energy level

In normal circumstances, electrons fill the shell at the lowest energy level starting from the shell K, L M and then N

When an atom gets energy from outside, the electrons will absorb energy so it moves to higher energy. This situation is called excited

Electrons will return to the original path or a lower energy level because the excited state is unstable. In this condition, the electron will release energy

The electron energy at the nth path can be formulated:

$\rm En=(-Rh)/(n^2)$