A balance is used to determine: my answer is a weight mass gravity

QUESTION POSTED AT 14/02/2020 - 09:40 AM

Answered by admin AT 14/02/2020 - 09:40 AM

Answer: A balance is used to determine accurate mass of substances.

Explanation: Electronic balance is used to measure the small to large mass of substance from miligrams to grams to kilograms according to their features. Differnt different Electronic balances are used on the basis of amount to be measure.

In pharmaceuticals , other laboratories , schools , colleges mainly electronic balance is used , as it measure accurate weight of the substances.

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The force of gravity on the surface of a planet will affect a person's or object's _

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ANSWERED AT 28/02/2020 - 05:23 PM

QUESTION POSTED AT 28/02/2020 - 05:23 PM

The correct answer is c. Energy processing from corn biofuels is not energy efficient.


ANSWERED AT 28/02/2020 - 05:17 PM

QUESTION POSTED AT 28/02/2020 - 05:17 PM

What is the molarity of a solution of kno3 (molecular mass = 101 that contains 404 grams of kno3 in 2.00 liters of solution? a 1.00 b 2.00 c 0.500 d 4.00?

(1 mol KNO3/ 101 g KNO3)(404 g KNO3)= 4 moles

ANSWERED AT 28/02/2020 - 04:37 PM

QUESTION POSTED AT 28/02/2020 - 04:37 PM

A certain vinegar is 6.02% acetic acid (hc2h3o2, by mass. how many grams of acetic acid are contained in a 355 ml bottle of vinegar. assume a density of 1.01 g/ml.

First, determine the amount of vinegar in grams by multiplying the volume by the density. That is,
                                        mass = (355 ml) x (1.01 g/mL) = 358.55 g
Then, multiply the calculated mass above by the decimal equivalent of the given percentage above. 
                      amount of acetic acid = (358.55 g)(0.0602) = 21.58 g

ANSWERED AT 28/02/2020 - 04:11 PM

QUESTION POSTED AT 28/02/2020 - 04:11 PM

Determining missing genotypes

What are the genotypes

ANSWERED AT 28/02/2020 - 03:42 PM

QUESTION POSTED AT 28/02/2020 - 03:42 PM

Write the symbol for every chemical element that has atomic number less than 74 and atomic mass greater than 173.8u

You should be able to locate them on the periodic table as long as you know which part the atomic number is and which part the atomic mass is.

ANSWERED AT 28/02/2020 - 03:22 PM

QUESTION POSTED AT 28/02/2020 - 03:22 PM

Suppose 13.00 mL of 0.100 M barium hydroxide is required to neutralize 17.00 ml of nitric acid with an unknown concentration. What is the concentration of the nitric acid. Express your answer in mol/L

The concentration of {\text{Ba}}{\left( {{\text{OH}}} \right)_2}solution is \boxed{{\text{0}}{\text{.076 M}}}

Further Explanation:

The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:

1. Molarity (M)

2. Molality (m)

3. Mole fraction (X)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.

The molarity equation is given by the following expression:

{{\text{M}}_{\text{1}}}{{\text{V}}_{\text{1}}} = {{\text{M}}_{\text{2}}}{{\text{V}}_{\text{2}}}


{{\text{M}}_{\text{1}}} is the molarity of the first solution.

{{\text{V}}_{\text{1}}} is the volume of the first solution.

{{\text{M}}_{\text{2}}} is the molarity of the second solution.

{{\text{V}}_{_{\text{2}}}} is the volume of the second solution.

In the concerned question, {\text{Ba}}{\left( {{\text{OH}}} \right)_2}is neutralized by {\text{HN}}{{\text{O}}_{\text{3}}}. So molarity equation becomes,

{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} = {{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}                           …… (1)


{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is the molarity of {\text{Ba}}{\left( {{\text{OH}}} \right)_2} solution.

{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}is the volume of {\text{Ba}}{\left( {{\text{OH}}} \right)_2}solution.

{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is the molarity of {\text{HN}}{{\text{O}}_{\text{3}}}solution.

{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is the volume of {\text{HN}}{{\text{O}}_{\text{3}}}solution.

Rearrange equation (1) to calculate {{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}.

{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} = \frac{{{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}}}{{{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}}}                                       …… (2)

The value of {{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is 13 mL.

The value of {{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is 0.100 M.

The value of {{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is 17 mL.

Substitute these values in equation (2).

\begin{aligned}{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}&=\frac{{\left( {{\text{0}}{\text{.100 M}}} \right)\left( {{\text{13 mL}}} \right)}}{{\left( {{\text{17 mL}}}\right)}}\\&=0.{\text{07647 M}}\\&\approx {\text{0}}{\text{.076 M}}\\\end{aligned}

Hence the concentration of barium hydroxide solution is 0.076 M.

Learn more:

1. What is the mass of 1 mole of viruses: brainly.com/question/8353774

2. Determine the moles of water produced: brainly.com/question/1405182

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: molarity, 13 mL, 17 mL, 0.076 M, Ba(OH)2, M1, V1, M2, V2, HNO3, 0.100 M, molarity, volume.

ANSWERED AT 28/02/2020 - 02:39 PM

QUESTION POSTED AT 28/02/2020 - 02:39 PM

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? a) 1.00 b) 18.0 c) 36.0 d) 324

Number of moles = Given Mass / Molar mass

Here, Given mass = 18 g
Molar mass = 18 g/mol

Substitute their values, 
n = 18/18
n = 1 mol

In short, Your Answer would be: Option A

Hope this helps!

ANSWERED AT 28/02/2020 - 12:46 PM

QUESTION POSTED AT 28/02/2020 - 12:46 PM

Precision is _____. I cant find a proper answer.? help??

Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.

ANSWERED AT 28/02/2020 - 12:19 PM

QUESTION POSTED AT 28/02/2020 - 12:19 PM

Science A. is truth B. attempts to answer questions we have based on our observations C. is the answer to all questions D. relies heavily on beliefs and opinion

B. attempts to answer questions we have based on our observations

ANSWERED AT 28/02/2020 - 12:18 PM

QUESTION POSTED AT 28/02/2020 - 12:18 PM

Balance the equation in acidic conditions: Cu+No3- ---> Cu2+ + No

2Cu+No3----> Cu2+3No

ANSWERED AT 28/02/2020 - 12:08 PM

QUESTION POSTED AT 28/02/2020 - 12:08 PM

What is the difference between a mixture and a compound? (need an easy two sentence answer (able to explain it to a 8 your old).)

 A mixture is made from two or more substances that are chemically unlike and are not chemically joined. A compound is a substance formed when two or more elements chemically react with each other to ... substances because no new substance is formed, therefore they do not have any fixed properties.

ANSWERED AT 28/02/2020 - 12:02 PM

QUESTION POSTED AT 28/02/2020 - 12:02 PM

I need help with balancing equations

It is 2 1 1 3 give thanks please

ANSWERED AT 28/02/2020 - 11:58 AM

QUESTION POSTED AT 28/02/2020 - 11:58 AM

5. In this lab, you continued to add Reagent D to each solution until it turned blue. The purpose was to remove the oxygen to measure how much was left. The more drops you had to add to acquire the blue color, the more oxygen was present in the tube. In which phase(s) did the solution turn blue before you added Reagent D? What do you think that means? NO FALSE ANSWERS

A solution is turning blue means, it is turning it's behavior to Basic from Acidic. Reagent D must be a Basic component so it is increasing the pH of the solution. As reaction does not depend on the phase of the component, it could be anything i.e., Solid, Liquid or gas.

Hope this helps!

ANSWERED AT 28/02/2020 - 11:42 AM

QUESTION POSTED AT 28/02/2020 - 11:42 AM

Which of the following would increase the conductivity of a connecting wire? (More than one answer). A) increase the diameter B) increase the length of the wire C) decrease the temperature o the wire D) switch from steel wire to gold wire

All but length I suppose. Diameter would definitely increase the conductivity of a wire, that's why jumper cables are so big, to conduct very large amounts of electricity. Also decreasing temperature allows for a faster flow of electrons causing better conductivity. Finally, Gold is very, very conductive and would be used in wires everywhere if it weren't so expensive(that's why copper is used a lot instead) also gold is quite delicatewouldn't want to bend it back and forth a lot like most wires but simply put, yes. Gold would also very much up the conductivity.

ANSWERED AT 28/02/2020 - 11:29 AM

QUESTION POSTED AT 28/02/2020 - 11:29 AM

A sample of water is mixed with a surfactant. What will most likely happen to the viscosity of the water? Explain your answer.

--The viscosity of the water will decrease.

--Surfactants disrupt intermolecular forces within a liquid.

--Viscosity is directly related to intermolecular forces.

--If intermolecular forces are decreased, viscosity should also decrease.

ANSWERED AT 28/02/2020 - 11:23 AM

QUESTION POSTED AT 28/02/2020 - 11:23 AM

The forces between water molecules are stronger than the forces between ethanol molecules. Which liquid would probably be most difficult for an insect to walk on? Explain your answer.

An insect would have an easier time walking on the surface of water than on the surface of ethanol. Water's stronger intermolecular forces lead to higher surface tension. Higher surface tension allows water to support the insect. I hope this helps.

ANSWERED AT 28/02/2020 - 11:20 AM

QUESTION POSTED AT 28/02/2020 - 11:20 AM

A sample of nitrogen in a glass bulb has a mass of 245 mg what is its mass in kilograms


245*10⁻⁶ kg



Mass of nitrogen in a glass bulb = 245 mg

In order to convert mass from mg (milligrams) to kg (kilograms) use the following relation

1 mg = 0.001 gram = 10⁻³ g

1 g = 0.001 kg = 10⁻³ kg


1 mg = 10⁻⁶ kg

The given mass of 245 mg would correspond to :

\frac{245 mg * 10^{-6} kg}{1 kg} = 245*10^{-6} kg

ANSWERED AT 28/02/2020 - 10:55 AM

QUESTION POSTED AT 28/02/2020 - 10:55 AM

What is the purpose of adding nahso3 at the end of the oxidation? write a balanced equation for the reaction it undergoes?

The purpose of adding NaHSO3 at the end of the oxidation is to quench the excess oxidizing agent NaOCl. 
NaHSO3 + NaOCl → NaCl + NaHSO4

ANSWERED AT 28/02/2020 - 10:33 AM

QUESTION POSTED AT 28/02/2020 - 10:33 AM

Please determine the concentration of fe in the original solution

You need to give us the rest of the problem if you want us he answer it

ANSWERED AT 28/02/2020 - 07:57 AM

QUESTION POSTED AT 28/02/2020 - 07:57 AM

In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. write the balanced chemical equation describing this reaction (using lowest whole-number coefficients.


2H₂ + O₂ → 2H₂O


The problem tells us that hydrogen gas (H₂) and oxygen gas (O₂) are the reactants, while water (H₂O) is the only product. Thus, the reaction is:

H₂ + O₂ → H₂O

In order to balance this equation, we begin with counting the atoms of O present in the left side and in the right side of the equation. Because there are two O atoms in the left but only one on the right, we add a coefficient of 2 in the right side:

H₂ + O₂ → 2H₂O

Now we count the H atoms, there are 2 in the left and 4 in the right, so we add a coefficient of 2 for the hydrogen gas:

2H₂ + O₂ → 2H₂O

Now there are 4 H atoms in both sides, and 2 O atoms in both sides, so the equation is balanced.

ANSWERED AT 28/02/2020 - 07:55 AM

QUESTION POSTED AT 28/02/2020 - 07:55 AM

Kelly has some sand in a bucket, but she thinks that there may be some salt mixed in with her sand. How can she determine if there is salt in the sand?


Use dissolution, filtration and evaporation


There are a few steps to follow to determine if there is salt in the bucket

1. Pour deionized water into the bucket covering all the sand

2. Filter this mixture leaving the sand as the residue and the water running through as the filtrate

3. Heat the filtrate and evaporate the water. If there is salt left behind in the heating dish then there was salt mixed in with the sand

ANSWERED AT 28/02/2020 - 06:31 AM

QUESTION POSTED AT 28/02/2020 - 06:31 AM

Determine the number of Nitrogen atoms present in 4.00 moles of N2O5

Multiply this number by avogadro's number- 6.02 times 10^23

ANSWERED AT 28/02/2020 - 05:46 AM

QUESTION POSTED AT 28/02/2020 - 05:46 AM

For #11 how to determine the signs?

The first reaction is exothermic as it releases heat as shown by the '+ 48 kJ'. When a reaction is exothermic the enthalpy change (ΔH) is negative as the system is losing heat. The entropy change (ΔS) is also negative as 4 moles of gas are reacting to form 2 moles of gas, reducing the disorder in the system. Since the spontaneity of a reaction is governed by ΔG = ΔH - TΔS, where ΔG must be negative for a spontaneous reaction, the reaction is only spontaneous at low temperatures as both ΔH and ΔS are negative, so as temperature increases, so does ΔG, toward 0.
The second reaction is endothermic as it absorbs heat therefore having a positive ΔH, and a positive ΔS as one mole of liquid is converted to one mole of more disordered gas. Using the same equation as before it can be shown that the reaction is only spontaneous at higher temperatures. These answers all hold true for the 3rd reaction as well (i.e. positive ΔH, positive ΔS and spontaneous at high temperatures).
Finally, reaction 4 is exothermic, therefore negative ΔH, and has a positive ΔS as 2 moles in solution are produced from one mole of solid. Therefore using the equation shown before, ΔG will always be negative regardless of temperature, and therefore the reaction is always spontaneous.
Hope this helps! If you could I would greatly appreciate you making this the brainliest answer :) If you have any questions feel free to ask.

ANSWERED AT 28/02/2020 - 04:54 AM

QUESTION POSTED AT 28/02/2020 - 04:54 AM