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Questions in Grade Middle-school

[Homework Help] Which atom has the largest atomic radius? A. potassium B. rubidium C. francium D. cesium

[Homework Help] What did the Declaration of Independence do?

[Homework Help] The coefficients in a balanced chemical equation represent: 1. the mass ratios of the substances in the reaction 2. the mole ratios of the substances in the reaction 3. the total number of electrons in the reaction 4. the total number of elements in the reaction

[Homework Help] Compared to the physical and chemical properties of the compound NO2, the compound N2O has 1. different physical properties and different chemical properties 2. different physical properties and the same chemical properties 3. the same physical properties and different chemical properties 4. the same physical properties and the same chemical properties

[Homework Help] Given the balanced equation representing a reaction: \[ \text{O}_2 \rightarrow \text{O} + \text{O} \] What occurs during this reaction? 1. Energy is absorbed as bonds are broken. 2. Energy is absorbed as bonds are formed. 3. Energy is released as bonds are broken. 4. Energy is released as bonds are formed.

[Homework Help] Who lived in America before the Europeans arrived?

[Homework Help] What would be the cost to each person in the United States to build a Death Star if its cost is [tex]$9 \times 10^{14}$[/tex] dollars? Express your answer to one significant figure.

[Homework Help] Who was President during World War I?

[Homework Help] What ocean is on the West Coast of the United States?

[Homework Help] A sample of a substance has these characteristics: - Melting point of 981 K - Hard, brittle solid at room temperature - Poor conductor of heat and electricity as a solid - Good conductor of electricity as a liquid or in an aqueous solution This sample is classified as: 1. a metallic element 2. a radioactive element 3. a molecular compound 4. an ionic compound