Exams & Certification

Exams & Certification

Identify the following as physical (P) or chemical (C) changes.

PHYSICAL CHANGE \ a change in size, shape, or state \ no new substance is formed CHEMICAL CHANGE \ a change in the physical and chemical properties \ a new substance is formed Identify the following as physical (P) or chemical (C) changes. 1. NaCl (Table Salt) dissolves in water. 2. Ag (Silver) tarnishes. 3. An apple is cut. 4. Heat changes H2O to steam.

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Expresa en kilogramos cada masa

Expresa en kilogramos cada masa a. 753 lb. b. 250 onzas. lo necesitoo rapidoooooooo plissssssssss doy corona The Correct Answer and Explanation is: Claro, vamos a hacer esas conversiones. a) 753 lb a kilogramos: 1 libra (lb) = 0.453592 kilogramos (kg). Entonces, para convertir 753 libras a kilogramos:753 lb×0.453592 kg/lb=341.73 kg753 \, \text{lb} \times 0.453592 \, \text{kg/lb} =

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You borrow50 from dad

You borrow50 from dad. You buy a shirt for3 in change. You give1 back to dad. You keep The Correct Answer and Explanation is: This is a classic “missing dollar riddle” that plays on confusion about how the amounts are being accounted for. Let’s break it down clearly: So the $49 you “keep” is not

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Chemical Bonding

Chemical Bonding: Predicting Bond Order and Paramagnetism Using the MO Model To determine the stability and magnetic properties of diatomic molecules, we can use the molecular orbital (MO) model. The table below provides information about some diatomic molecules. Please complete the table by deciding whether each molecule is stable or not, whether it would be

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CHEMICAL BONDING Using the MO model to predict bond order and paramagnetism Complete the table below, which lists information about some diatomic molecules or molecular ions

CHEMICAL BONDING Using the MO model to predict bond order and paramagnetism Complete the table below, which lists information about some diatomic molecules or molecular ions. In particular: Decide whether each molecule is stable or not Decide whether each molecule would be diamagnetic or paramagnetic. Calculate each molecule’s bond order; diamagnetic or paramagnetic? molecule stable?

CHEMICAL BONDING Using the MO model to predict bond order and paramagnetism Complete the table below, which lists information about some diatomic molecules or molecular ions Read More »

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