All categories

3 years ago

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and

Chemistry

1 answer:

vredina [299]3 years ago

3 0

C) 6.781 g

Explanation:

Precision in a reading is the ability to reproduce the same set of results.

Accuracy is the nearness of the measured value to the true value.

Every measurement must be taken accurately and precisely.

Now to determine the value of the block's mass that would be the most precise, let us arrange the masses in their increasing order.

6.759 g, 6.786 g, 6.812 g, 6.779 g

Arranging in increasing order;

6.759 g , 6.779 g, 6.786 g 6.812 g

An value from the option that falls within the given values will make it even more precise;

6.781 g would perfectly fit this condition.

Other values are lower or higher than the given sets.

learn more:

Repeating experiments brainly.com/question/10934170

#learnwithBrainly

You might be interested in

AlCl3 is lewis acid. Explain how?

professor190 [17]

For AlCl3 to be a Lewis acid, it would have to react in such a way that it accepted a lone pair from some other atom or molecule from a Lewis base.AlCl3 has an electron-deficient aluminum atom. It has only six electrons in its valence shell. It readily accepts electrons from other atoms, in an attempt to get a full valence shell of eight electrons.

3 0

4 years ago

A 4.5 liter sample of a gas at 2 atm and 300 K has 0.80 mole of gas. If 0.35 mole of the gas is added to the sample at the same

Elis [28]

Answer:

6.5 liters.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If P and T are constant, and have different values of n and V:

(V₁n₂) = (V₂n₁)

Knowing that:

V₁ = 4.5 L, n₁ = 0.80 mol,

V₂ = ??? L, n₂ = 0.35 + 0.80 = 1.15 mol.

Applying in the above equation

(V₁n₂) = (V₂n₁)

∴ V₂ = (V₁n₂)/n₁ = (4.5 L)(1.15 mol)/(0.8 mol) = 6.469 L ≅ 6.5 L.

So, the right choice is: 6.5 liters.

6 0

3 years ago

A student titrated 20 ml of 0.410 m hcl with 0.320 m naoh. determine the volume of naoh needed at equivalence point

Aleksandr-060686 [28]

Answer:

25.6mL NaOH

Explanation:

We are given the Molarity of the solution ( $\frac{moles}{liters}$ ) and the volume of the solution (.02L).

By multiplying the two together, we can find the moles of solution that are reacted with HCl.

$moles = \frac{.410 moles}{L} *.02L$

This gives us .0082 moles of HCl.

We then find the moles of NaOH that are needed to react with the HCl using the equation.

$HCl + NaOH = NaCl + H_{2} O$

As HCl and NaCl have a 1:1 ratio, we need .0082 mol of NaOH.

Dividing this value by the Molarity of the solution

$\frac{.0082mol}{.320mol/L}$

Gives us the answer, in Liters (.0256), which we can then divide by 100 convert to mL.

3 0

3 years ago

Which of the following is an example of chemical weathering

bagirrra123 [75]

Acid rain is a form of chemical weathering that wears away marble buildings.

7 0

4 years ago

Read 2 more answers

Do temperature and kinetic energy follow a straight-line graph at lower temperature? Explain.

yawa3891 [41]

I think is NO because lowering the temperature increase of kinetic energy therefore kinetic energy is inversely to temperature.

3 0

3 years ago