Milk tea with boba balls is an example of a(n) Heterogeneous mixture Element Compound Homogeneous mixture Which of the following is an example of a chemical change? Methane burning Ice melting Boiling water Cutting rope An ion has a charge of +2, with 30 electrons and a mass number of 66. The number of neutrons is . 38 34 32 36 When an element A, from group 1, combines with element B, from group 16, the formula of the resulting compound will be _. A2B AB AB2 AB3 The hypothetical element tryon, Tr, has two isotopes: 35Tr has an atomic mass of 34.88 amu, and a percent abundance of 38.0%. 38Tr has an atomic mass of 37.95 amu, and a percent abundance of 62.0%. The average atomic mass of tryon is amu. 39.1 36.0 36.8 34.5
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- Milk tea with boba balls is an example of a Heterogeneous mixture.
- A heterogeneous mixture contains components that are not uniformly distributed, meaning that the different substances remain separate and distinct. In this case, the milk tea and boba balls can be seen and distinguished from one another.
- In contrast, a homogeneous mixture has components that are uniformly distributed, such as sugar dissolved in tea.
- An example of a chemical change is Methane burning.
- A chemical change involves the transformation of a substance into one or more new substances. Burning methane (CH₄) combines it with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O), a chemical reaction.
- Ice melting and boiling water are physical changes, as the substances (water and ice) change state but their chemical composition remains the same.
- Cutting rope is also a physical change, where the rope is divided into smaller pieces but its material remains unchanged.
- The number of neutrons in an ion with a charge of +2, 30 electrons, and a mass number of 66 is 36.
- An ion with a charge of +2 means it has lost two electrons. Since it has 30 electrons, its neutral atom would have had 32 electrons (30 + 2).
- The mass number is the total number of protons and neutrons. If the mass number is 66 and the number of protons (atomic number) is 32, the number of neutrons would be:
66 – 32 = 34 neutrons.
- When element A from group 1 combines with element B from group 16, the formula of the resulting compound will be AB₂.
- Group 1 elements (like lithium, sodium) form +1 ions, while Group 16 elements (like oxygen, sulfur) form -2 ions. To balance the charges, you need two +1 ions for every -2 ion. Therefore, the formula will be AB₂.
- The average atomic mass of Tryon (Tr) is 36.0 amu.
- The average atomic mass is calculated by multiplying the atomic mass of each isotope by its percent abundance, then adding the results. Average atomic mass=(34.88 amu×0.38)+(37.95 amu×0.62)\text{Average atomic mass} = (34.88 \, \text{amu} \times 0.38) + (37.95 \, \text{amu} \times 0.62)Average atomic mass=(34.88amu×0.38)+(37.95amu×0.62) Average atomic mass=13.23 amu+23.54 amu=36.0 amu\text{Average atomic mass} = 13.23 \, \text{amu} + 23.54 \, \text{amu} = 36.0 \, \text{amu}Average atomic mass=13.23amu+23.54amu=36.0amu
