CHEMISTRY HIGH SCHOOL

1. The speed limit on most city streets is (25 miles). How many meters per minutehour
is this?
This is a conversion.

Answers

Answer 1

Answer:

Answer:

$Speed = 670.56 (m)/(min)$

Explanation:

Given

$Speed = (25 mi)/(hr)$

Required

Convert to meters per minutes

$Speed = (25 mi)/(hr)$

Start by converting the speed from miles to meters

$1\ mile = 1609.34\ meters.$

So, we have:

$Speed = (25 * 1609.34\ m)/(hr)$

$Speed = (40233.5\ m)/(hr)$

Next, we convert time from hours to minutes

$1\ hour = 60\ minutes$

So, we have:

$Speed = (40233.5\ m)/(60\ min)$

$Speed = 670.56 (m)/(min)$

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

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Which subatomic particles are located in the nucleus of an He-4 atom?(1) electrons and neutrons
(2) electrons and protons
(3) neutrons and protons
(4) neutrons, protons, and electrons

Answers

The answer is (3) neutrons and protons. The nucleus of an atom is composed of neutrons and protons. There is only one atom nucleus composed of only protons, Hydrogen. And the electrons are moving in high speed around the nucleus.

The nucleus of an atom contains the majority of its mass and is composed of two types of subatomic particles: protons and neutrons.

1. Protons: Protons are positively charged particles found in the nucleus of an atom. Each proton carries a charge of +1 and has a relatively high mass compared to electrons. The number of protons in an atom's nucleus determines its atomic number, which in turn defines the element. In the case of helium-4 (He-4), it has an atomic number of 2, indicating that there are two protons in its nucleus.

2. Neutrons: Neutrons are electrically neutral particles, meaning they have no net charge. They are also located in the nucleus of an atom. Neutrons contribute to the mass of the nucleus and help stabilize it by balancing the electrostatic repulsion between positively charged protons. Helium-4, being a stable isotope of helium, has two neutrons in its nucleus, along with the two protons.

Electrons, on the other hand, are found in electron shells or orbitals outside the nucleus, not within it. Their role is to move around the nucleus and create the electron cloud or electron configuration, which determines an atom's chemical properties.

In summary, the nucleus of a helium-4 atom consists of neutrons and protons, making option (3) "neutrons and protons" the correct choice. Electrons, which are negatively charged, are located outside the nucleus and are involved in chemical interactions and bonding.

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If 20 milliliters of 4.0 M NaOH is exactly neutralized by 20 milliliters of HCL, the molarity of the HCL is

Answers

Volume of NaOH = 20 mL / 1000 = 0.02 L

Molarity NaOH = 4.0 M

number of moles NaOH :

n = M * V

n = 4.0 * 0.02

n = 0.08 moles of NaOH:

Finally we calculate the number of moles of HCl in the solution from the stoichiometry of the reaction :
HCl + NaOH = NaCl + H₂O

1 mole HCl ---------- 1 mole NaOH
? moles HCl --------- 0.08 moles NaOH

moles HCl = 0.08 * 1 / 1

= 0.08 moles of HCl

Volume of HCl = 20 mL / 1000 = 0.02 L

M ( HCl ) = n / V

M = 0.08 / 0.02

= 4.0 M

hope this helps!

Answer:

4.0

Explanation:

In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})? a. The ion has a more stable electronic arrangement than the atom.
b. The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
c. The ion has two more protons than the atom.
d. The ion will react more readily with free Cl₂. (E)The ion has two more planetary electrons than the atom. Can anyone explain this one?

Answers

The correct answer is A. Atoms and ions only differ in the number of electrons each one has and atoms form ions to achieve a more stable electron configuration.

I hope this helps. Let me know if anything is unclear.

Two or more atoms that have been chemically combined are
called a

Answers

Answer:

compound

Explanation:

A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label. Which element is this?

Answers

234hope it was helpful

In Ernest Rutherford's gold foil experiments, some alpha particles were deflected from their original paths, but most passed through the foil with no deflection. Which statement about gold atoms is supported by these experimental observations?Gold atoms consist mostly of empty space.

Gold atoms are similar to alpha particles.

Alpha particles and gold nuclei have opposite charges.

Alpha particles are less dense than gold atoms.

Answers

According to ErnestRutherford's gold foil tests, the true statement is that space makes up the majority of gold atoms. The correct option is A.

According to Rutherford's studies, the majority of the alphaparticles encountered free space inside the atom since they mostly went through the gold foil with little to no deflection.

This finding helped scientists comprehend that atoms have a small, compact nucleus at their center and are primarily made up of empty space elsewhere in the atom.

The nuclearmodel of the atom was created as a result of the deflection of several alpha particles, which showed that they came into contact with the positively charged atom's nucleus.

Thus, the correct option is A.

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Your question seems incomplete, the probable complete question is:

A. Gold atoms consist mostly of empty space.

B. Gold atoms are similar to alpha particles.

C. Alpha particles and gold nuclei have opposite charges.

D. Alpha particles are less dense than gold atoms

Answer:

Explanation:

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