CHEMISTRY HIGH SCHOOL

Which physical method can separate a mixture of steel ball bearings and marbles ?a. boiling
b. evaporation
c. filtration
d.sorting

Answers

Answer 1
Answer:

SORTING METHOD can easily be used to separate a mixture of steel ball bearing and marbles. This separation method is suitable because the two substances that are mixed together have big sizes, so it is easy to separate the two by hand picking the particles. Sorting method is usually used as a separation technique when the size of the mixture is big and the mixed substances are in the same state.
Answer 2
Answer:

Answer:

D. Sorting

Explanation:

Just tested

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A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?Use: Mi Vi = Mf Vf

A.) 125 mL
B.) 250 mL
C.) 500 mL
D.) 2,000 mL

Answers

Mi = 2.0 M

Vi = 1.0 mL

Mf = 0.0080 M

Vf = ?

Mi * Vi = Mf* Vf

2.0 * 1.0 = 0.0080 * Vf

2 = 0.0080* Vf

Vf = 2 / 0.0080

Vf = 250 mL

answer b

hope this helps!.

Answer: Option (B) is the correct answer.

Explanation:

The given data is as follows.

              M_(1) = 2.0 M,           V_(1) = 1.0 ml

              M_(2) = 0.008 M,         V_(2) = ?

Therefore, calculate the volume of given solution as follows.

              M_(1) * V_(1) = M_(2) * V_(2)

Now, putting the given values into the above formula as follows.

            M_(1) * V_(1) = M_(2) * V_(2)

            2.0 M * 1.0 ml = 0.008 M * V_(2)    

                   V_(1) = 250 ml

Therefore, volume of the solution obtained is 250 ml.

Which must be a mixture of substances?
1. solid
2. liquid
3. gas
4. solution

Answers

the one that must be a mixture of substance is : 4. Solutionhere are some examples that proof option 1 - 3 could consist only with a single substance :Solid = Fe ( most commonly known as iron)Gas = He ( Most commonly known as helium)Liquid = Hg (most commonly known as mercury)

4.Solution

Further explanation

Mixtures are materials composed of two or more kinds of substances that still possess their original properties. Mixtures can also be said to represent a combination of several substances, elements or compounds

There are two types of mixtures, i.e., homogeneous mixture (or solution) and heterogeneous mixture.

  • Homogeneous mixture: mixture which each part contains a similar amount of solute, for example, vinegar acid solution, sugar solution, and salt solution.
  • Heterogeneous mixes: mixtures of which each part contains an unequal amount of solute, for example, river water, sewage water, and coffee drinks.

The solution is a homogeneous mixture of two or more substances that dissolve one another and each of the constituent substances cannot be distinguished physically anymore.

  • The solution consists of two components, i.e., solute and solvent.
  • For example, a salt solution consists of salt as a solute and water as a solvent.

In chemistry, we already know the phase of matter or state of matter, i.e., solid (s), liquid (l), gas (g), and aqueous (aq). Every chemical solution in a reaction is labeled as an aqueous phase, e.g, \boxed{ \ NaCl_((aq)) \ } as a salt solution.

Consider the following examples:

  • \boxed{ \ Fe_((s)) \ } as a solid metal iron, an element.
  • \boxed{ \ H_2O_((l)) \ } as liquid water.
  • \boxed{ \ H_2O_((s)) \ } as ice solids.
  • \boxed{ \ H_2O_((g)) \ } as water vapor with a gaseous phase.
  • \boxed{ \ H_2O_((l)), H_2O_((s)), H_2O_((g)) \ } are compounds of the same chemical formula but different phases.

Learn more

  1. About the mass and density of substances  brainly.com/question/4053884
  2. Calculating the pH value of weak base brainly.com/question/9040743
  3. How was the water filtered to remove debris and living organisms?  brainly.com/question/5646770

Keywords: which must be, a mixture of substances, solid, liquid, gas, solution, homogeneous, heterogeneous, phase of matter, state, aqueous, salt, water

#1. The arrangement of atoms at the peak of the activation energy barrier is known as the _____. A. activation rate B. activated complex C. transition state D. both B and C #2. Two opposing reactions (A + B C + D) occurring simultaneously at the same rate is an example of:A. reversibility./B. chemical equilibrium./C. neither a nor b/D. both a and b
#3. A substance that interferes with the action of a catalyst is known as a(n) _____.

A. negative inhibitor
/B. either an inhibitor or negative inhibitor /C. inhibitor /D. activated complex
#4. The reducing agent in the reaction described in Fe + 2HCl → FeCl2 + H2 is


A. Fe./B. HCl./C. FeCl2.

Answers

1) Answer is: D. both B and C.

Activated complex  is collection of intermediate structures in a chemical reaction that forms while bonds are breaking and new bonds are forming.

The transition state is the configuration at the peak of the diagram while the activated complex can refer to any point near the maximum.

Activation energy is the minimum energy colliding particles must have in order to react.

2) Answer is: B. chemical equilibrium.

Balanced chemical reaction: A + B ⇄ C + D.

1) In a chemical reaction, chemical equilibrium is the state in which both reactants ( and BA) and products (C and D) are present in concentrations which have no further tendency to change with time.  

2) At equilibrium, both the forward and reverse reactions are still occurring.

3) Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.

3) Answer is: C. inhibitor.

Inhibitor is a substance that decreases the rate of a chemical reaction.

Inhibitor can reduce the effectiveness of a catalyst in a catalysed reaction.

Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.  

Reactions occur faster with a catalyst because they require less activation energy.  

4) Answer is: A. Fe.

Balanced reaction: Fe + 2HCl → FeCl₂ + H₂.

Oxidation reaction: Fe⁰ → Fe⁺² + 2e⁻.

Reduction reaction: 2H⁺ + 2e⁻ → H₂⁰.

Reducing agent is an element or compound that loses an electron to another chemical species in a redox chemical reaction and they have been oxidized.

Iron (Fe) change oxidation number from 0 to +2 (lose electrons), iron is oxidized (reducing agent).

Answer :

1) The correct option is, (D) both B and C.

2) The correct option is, (D) both A and B

3) The correct option is, (C) inhibitor.

4) The correct option is, (A) Fe

Explanation :

For part 1 :

Activated complex or transition state : It is the state where the bonds are loosened and new lose bonds are formed between them. It is unstable state and immediately dissociates to form the stable products. The arrangement of atoms takes place at the peak of the activation energy barrier.

For part 2 :

The balanced chemical reaction is,

A+B\rightleftharpoons C+D

Chemical equilibrium : It is defined as a state where the rate of forward reaction is equal to the rate of backward reaction. That means there is no net change in the concentration of the reactants and the products.

Reversibility : It is defined as, in a reversible reaction when reactant A and B react to form products C and D and in the reverse reaction, C and D react to form A and B. That means process is reversible.

For part 3 :

Inhibitor : It is the substance that decreases the rate of the chemical reaction. It can reduce the effectiveness of the catalyst in a catalyzed reaction.

Or we can say that it is a substance that interferes with the action of a catalyst.

For part 4 :

The balanced redox reaction is :

Fe+2HCl\rightarrow FeCl_2+H_2

The half oxidation-reduction reactions are:

Oxidation reaction :Fe\rightarrow Fe^(2+)+2e^-

Reduction reaction :2H^++2e^-\rightarrow H_2

From this we conclude that the 'Fe' is the reducing agent that loses an electron to another chemical species in a redox chemical reaction and itself oxidized.

Hence, the reducing agent is, Fe

If the Kelvin temperature of a gas is tripled and the volume if doubled, the new pressure will be ___. A. 3/2 the original pressure B. 1/6 the original pressure C. 5 times the original pressure D. 2/3 the original pressurethe answer isnt b or c

Answers

The answer is 3/2 the original pressure. The concept behind this is the ideal gas law wherein it states that Pressure (P) times volume(V) is equal to number of moles (n) times ideal gas constant (R ) times temperature (T). Since you’re trying to calculate for the pressure you use P=nRT/V. Input 3 to Temperature and 2 to volume. You’ll get a pressure of 3/2 which is 3/2 times the original pressure. 

What are the four states of matter?

Answers

Solid, Liquid, Gas, and Plasma
Solid, Liquid, Gas, and Plasma

Calculate the density of a sample of liquid with a volume of 130 ml and a mass of 585 g.

Answers

Answer:

4.5 g/ml

Explanation:

Density is the ratio of the mass of the liquid to the volume of the liquid.  The unit of mass, volume and density are g, ml and g/ml  respectively.

Density is directly proportional to the mass of the substance and is inversely proportional to the volume.

Given,

Mass of the liquid = 585 g

Volume of the liquid = 130 ml

Density = (mass)/(volume) = (585 g)/(130 ml) = 4.5 g/ml

The density of the sample of liquid with a volume of 130 mL and mass 585 g is \boxed{4.5\;{\text{g/mL}}}

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, energy, size, weight, and length are some of the examples of extensive properties.

Density is a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by \rho.

The formula to calculate the density of the liquid is,

{\mathbf{Density of liquid}}\left({\mathbf{\rho}}\right){\mathbf{=}}\frac{{{\mathbf{Mass of liquid}}\left({\mathbf{M}}\right)}}{{{\mathbf{Volume of liquid}}\left({\mathbf{V}}\right)}}              …… (1)

The mass of liquid (M) is 585 g. The volume of liquid (V) is 130 mL.

Substitute 585 g for the mass of liquid and 130 mL for the volume of liquid in equation (1).

\begin{gathered}{\text{Density of liquid}}\left(\rho\right)=\frac{{{\text{585 g}}}}{{{\text{130 mL}}}}\n=\boxed{4.5\;{\text{g/mL}}}\n\end{gathered}

So the density of the liquid with a volume of 130 mL and mass 585 g is {\mathbf{4}}{\mathbf{.5}}\;{\mathbf{g}}{\text{/}}{\mathbf{mL}}.

Learn more:

1. Calculation of volume of gas: brainly.com/question/3636135

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: Middle School

Subject: Chemistry

Chapter: Density

Keywords: density, mass, volume, 130 ml, liquid, intensive, extensive, characteristic property, 585 g, substance, amount, nature, same, additive.
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