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Questions in Grade Middle-school

[Answered] Name one problem that led to the Civil War.

[Answered] Which term represents a type of nuclear reaction? 1. condensation 2. vaporization 3. single replacement 4. natural transmutation

[Answered] The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the percent by mass of water in the hydrate to be 37.8%. What is the percent error for the student's measured value? (1) 5.0% (2) 4.8% (3) 1.8% (4) 0.05%

[Answered] What is the name of the national anthem?

[Answered] A bird flies 2.8 units due west and then 2.7 units due north. Another bird flies 2.7 units due west and 2.8 units due north. What is the angle between the net displacement vectors for the two birds?

[Answered] Which condensed structural formula represents an unsaturated compound? 1. CH3CH=CHCH3 2. CH3CH2CH3 3. CH3CH3 4. CH4

[Answered] Given the balanced ionic equation: \[ 3\text{Pb}^{2+} + 2\text{Cr} \rightarrow 3\text{Pb} + 2\text{Cr}^{3+} \] What is the number of moles of electrons gained by 3.0 moles of lead ions? 1. 5.0 mol 2. 2.0 mol 3. 3.0 mol 4. 6.0 mol

[Answered] Which formula represents an organic compound? 1. CaH₂ 2. C₄H₈ 3. H₂O₂ 4. P₂O₅

[Answered] Find the value of 15.0 Newtons in pounds.

[Answered] Which energy conversion must occur in an operating electrolytic cell? 1. Electrical energy to chemical energy 2. Electrical energy to nuclear energy 3. Chemical energy to electrical energy 4. Chemical energy to nuclear energy