What do the numbers listed for an element on the periodic table represent? The number with a higher value is the number of protons, and the number with a lower value is the number of neutrons.
The number with a higher value is the number of electrons, and the number with a lower value is the number of protons.
The number with a higher value is the mass, and the number with a lower value is the number of protons.
The number with a higher value is the number of protons, and the number with a lower value is the mass.
Answers
The number with a higher value is the mass. This is because the mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. On the other hand, the number with a lower value is the number of protons. The number of proton in the nucleus of the atom is the atomic number of the element. It involves only numbers of protons, thus, it has the lower value than the mass number.
For example, hydrogen has 1 proton and 1 neutron. Its atomic number is 1 (= number of protons). Its mass number is 2 (1 proton + 1 neutron = 2). Thus, mass number has higher value than the atomic number.
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b. a double bond.
c. ionic.
d. polyatomic.
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Final answer:
A covalent bond where electrons are shared unequally is known as a polar bond. This unequal sharing occurs due to differences in electronegativity between the two atoms involved in the bond.
Explanation:
A covalent bond in which electrons are shared unequally is defined as a polar bond. This corresponds to option a) polar. This occurs because one atom is more electronegative and pulls the shared electron pair towards its nucleus making the bond polar, having a partial positive and partial negative end. Option b) a double bond, refers to a covalent bond where two pairs of electrons are shared between atoms. Option c) ionic refers to a bond where electrons are completely transferred from one atom to another and option d) polyatomic refers to a molecule that consists of more than two atoms.
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Answer is: Democritus.
Democritus (c.460 — c.370 BC) was an Ancient Greek philosopher.
According to his atomic theory:
1) everything is composed of atoms.
2) atoms are physically indivisible
3) there is empty space between atoms.
4) atoms are indestructible and in motion.
5) there is an infinite number of atoms, which differ in shape and size.
Democritus was the first to propose the existence of atoms. Option A is the correct answer.
Thus, In contrast to the outdated idea that matter might be divided into any arbitrarily small quantity, atomic theory argues that matter is formed of discrete units called atoms.
It was first introduced as a philosophical idea by Democritus in ancient Greece and India, and it later became a widely accepted scientific theory. Chemical advancements at the time demonstrated that matter did indeed behave as if it were composed of particles.
A fundamental physical quality of matter is mass. The term "atomic mass" refers to the weight of an atom or molecule. To determine the average mass of elements and molecules as well as to resolve stoichiometry issues, the atomic mass is used.
Thus, Democritus was the first to propose the existence of atoms.
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Answer:
approximately 4.8 grams of oxygen gas is formed.
Explanation:
To determine the amount of oxygen (O2) formed when 12.26 grams of potassium chlorate (KClO3) is heated, we need to consider the chemical reaction that occurs during this process. When KClO3 is heated, it decomposes into potassium chloride (KCl) and oxygen gas (O2).
The balanced chemical equation for this reaction is:
2 KClO3(s) → 2 KCl(s) + 3 O2(g)
From the equation, we can see that 2 moles of KClO3 produce 3 moles of O2.
Calculate the molar mass of KClO3:
K: 39.10 g/mol
Cl: 35.45 g/mol
O: 16.00 g/mol
Molar mass of KClO3 = (39.10 + 35.45 + 3 * 16.00) g/mol = 122.55 g/mol
Calculate the number of moles of KClO3 in 12.26 grams:
Moles of KClO3 = (12.26 g) / (122.55 g/mol) = 0.1 moles
Now, we can determine the number of moles of O2 produced using the mole ratio from the balanced equation:
Moles of O2 = (0.1 moles of KClO3) * (3 moles of O2 / 2 moles of KClO3) = 0.15 moles
Finally, convert moles of O2 to grams:
Mass of O2 = (0.15 moles) * (32.00 g/mol for O2) = 4.8 grams
So, when 12.26 grams of KClO3 is heated, approximately 4.8 grams of oxygen gas is formed.
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Answer:
Explanation:
A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.
A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.
A rubber band stretching is a physical change. No new substances are made and the chemical makeup remains the same.
Answer:
physical
Explanation:
this is a physical action to create a change. does not involve chemicals or elements