Calculate the precent error:

The density of an aluminum block determined in an experiment was 2.69 g/cm^3. (True value 2.70 g/cm^3.)

I keep getting

.37% ish

0.37% is correct.

Percentage error
=(observed value-correct value)/Correct value * 100%
= -0.01/2.7*100%
=-0.37%

.702

To calculate the percent error, you need to use the formula:

Percent Error = [(Measured Value - True Value) / True Value] x 100

In this case, the measured value is 2.69 g/cm^3 and the true value is 2.70 g/cm^3.

Substituting these values into the formula, we get:

Percent Error = [(2.69 g/cm^3 - 2.70 g/cm^3) / 2.70 g/cm^3] x 100

Simplifying the numerator, we have:

Percent Error = [-0.01 g/cm^3 / 2.70 g/cm^3] x 100

Dividing the two values and multiplying by 100, we get:

Percent Error = -0.0037 x 100

Percent Error = -0.37%

So, the percent error in this case is approximately -0.37%. It is negative because the measured value is slightly smaller than the true value.