All categories

3 years ago

A volume is measured experimentally as 4.26mL. what is the percentage error, given that the correct value is 4.15mL

2 answers:

8 0

% error = | accepted value - experimental value | / accepted value × 100

Step one- | 4.15mL - 4.26mL | = 0.11

Step two- 0.11 / 4.15 = 0.027

Step three- -0.027 × 100 = 2.7%

kherson [118]3 years ago

5 0

Answer: The percentage error is 2.65 %.

Explanation:

To calculate the percentage error, we use the equation:

$\%\text{ error}=\frac{|\text{Experimental value - Accepted value}|}{\text{Accepted value}}\times 100$

We are given:

Experimental value of volume = 4.26 mL

Accepted value of volume = 4.15 mL

Putting values in above equation, we get:

$\%\text{ error}=\frac{|4.26-4.15|}{4.15}\times 100\\\\\%\text{ error}=2.65\%$

Hence, the percentage error is 2.65 %.

You might be interested in

Rare earth elements plz

Slav-nsk [51]

Rare earth metals are a group of 17 elements - lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground

3 0

3 years ago

Read 2 more answers

A person suspects that an unknown liquid is water. he adds 110.0 J of heat to 55.0 g of liquid. The temperature of the liquid in

Tema [17]

Explanation:

First thing first, you mistyped the specific heat of water, which should be

water

4.18

∘

Now, a substance's specific heat tells you how much heat is required to increase the temperature of

1 g

of that substance by

∘

In the case of water, you would need

4.18 J

to increase the temperature of

1 g

of water by

∘

Notice that your sample of water has a mass of

1 g

as well, which means that the only factor that will determine the amount of heat needed will be the difference in temperature.

The equation that establishes a relationshop between heat and change in temperature looks like this

⋅

, where

- heat absorbed

- the specific heat of the substance, in your case of water

- the change in temperature, defined as the difference between the final temperature and the initial temperature

Plug in your values and solve for

to get

1.00

⋅

4.18

⋅

∘

⋅

(

83.7

−

26.5

)

∘

239.096 J

Rounded to three sig figs, the answer will be

239 J

5 0

3 years ago

Which of the following has the largest atomic radius: F-, F, CL-, or CL?

Anna007 [38]

As you go down the table, more electron shells are added to make the radius larger, but as you go to the right, the protons' attraction increases so the radius actually shrinks. Therefore, according to the trend, Cl has a larger radius because it is lower in the table.

Answer: CL has a larger Atomic Radius.

6 0

3 years ago

Read 2 more answers

What is the net ionic equation of H3PO4(aq) + Ca(OH)2(aq) yields Ca3(PO4)2(aq) + H2O(l)

aalyn [17]

Answer:

The net ionic equation is:

6 OH⁻(aq) + 6 H⁺(aq) ⇒ 6 H₂O (l)

Explanation:

First it is convenient to determine the cation and the anion in each compound. Cations are the positive ions of a compound and are usually metals. Anions are the negative ions of a compound and are nonmetals.For that it is important to recognize polyatomic ions in a reaction. Polyatomic ions are charged molecules that bind so strongly that they cannot disassociate during chemical reactions. In other words, polyatomic ions are groups of two or more atoms that are chemically linked. These have a specific load and do not separate into individual components. Polyatomic ions can have both positive and negative charges. Some of the most common polyatomic ions are CO₃²⁻, NO₃⁻, NO₂⁻, SO₄²⁻, SO₃²⁻, ClO₃⁻, PO₄³⁻ and OH⁻.

Then you must make sure that the initial equation is completely balanced. To balance an equation, you must add coefficients in front of the compounds to match the amount of atoms of each element on both sides of the equation.

In this case, the final balanced equation after balancing is:

3 Ca(OH)₂(aq) + 2 H₃PO₄(aq) ⇒ 6 H₂O(l) + Ca₃(PO₄)₂(s)

When a species or compound dissociates, it separates into its positive (cation) and negative (anion) components. These will be the components that are balanced at the end for the net ionic equation.

Given that strong acids such as H₃PO₄ and strong bases such as Ca(OH)₂ are completely dissociated, in addition to everything previously mentioned related to polyatomic ions, the net ionic equation will be:

3 Ca⁺² (aq) + 6 OH⁻(aq) + 6 H⁺(aq) + 2 PO₄⁻³(aq) ⇒ 6 H₂O (l)+3 Ca⁺² (aq) + 2 PO₄⁻³ (aq)

In this case it was taken into account that the coefficients located in front of each molecule indicate the amount of each molecule for the reaction and that the subscripts next to each atom or ion is the number of atoms or ions in the equation. By multiplying the coefficient mentioned by the subscript, you get the amount of each element or ion present in the reaction.

The spectator ions are those that are present on both sides of the reaction and are not changed by the reaction, that is, they are present in exactly the same amount on both sides of the equation. In this way, they can be canceled from both sides of the reaction. The spectator ions in this case are PO₄³⁻(aq) and Ca²⁺(aq).

This leaves you with the net ionic equation:

6 OH⁻(aq) + 6 H⁺(aq) ⇒ 6 H₂O (l)

7 0

3 years ago

If we supply additional heat to a solid in equilibrium with its liquid at the melting point, the thermal energy added is used to

trapecia [35]

Answer:

c. change solid to liquid.

Explanation: Heat is an energy which is present in a substance which is obtained through the transfer of temperature from a substance or material of high temperature to a substance or material of lower temperature. Heat is measured in JOULES OR KILOJOULES,

When heat is applied to a solid material it tends to cause the atomic particles of the solid to have a high kinetic energy making them to loose attachment to each other,when this particles starts to get detached their is the chance of a CHANGE OF STATE WHICH CAN BE FROM SOLID TO LIQUID OR FROM LIQUID TO GAS.

6 0

3 years ago