1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
blondinia [14]
2 years ago
12

1. Something must have mass in order to create change.

Chemistry
1 answer:
nignag [31]2 years ago
8 0

These are three questions each with its complete answer.

Question 1. Something must have mass in order to create change.

A. True

B. False

Answer:

  • <u><em>False</em></u>

Explanation:

Two counter examples will prove that the statement is false.

  • light and fire

Neither light nor fire have mass, so they are not considered matter, but yet both can create changes.

Light is an electromagnetic wave, so it is energy, and as such it, of course, can cause some changes. One example are the chemical reactions, like photosynthesis, which require light to happen.

Ligth may also be described either as quanta named photons. Although photons behave like particles they do not have mass.

So, that example contradicts the statement that something must have mass in order to create change.

Fire also contradicts the statement. Fire is a manifestation of energy, it does not have mass, and sure you know how fire create changes in living and no living things.

Question 2. Powdered medicine fills a pill capsule. Which of the following is the best description of the state of the powder?

A. It is a solid because all powders are solid.

B. It is a gas because it takes up the entire volume of the pill capsule.

C. It is a liquid because it does not hold a definite shape.

Answer: the best description is the choice A:

  • A. It is a solid because all powders are solid.

Explanation:

Indeed, although sometimes the powder may be very fine (dust), yet it is not liquid or gas. Powders are always solid.

There are four main states of matter: solid, liquid, gas, and plasma.

Liquids are able to take the form of the container but do not occupy the entire container. Gases do occupy the entire container.

When powder is very fine it could resemble some properties of liquid, but the structure of powders is not crystaline, this is it is not an ordered arrangement. The structure of powders is an ordered arrangement, so powders are solids and not liquids.

It is easy to discard that a powdered medicine could be a gas, because it definetly do not occupy the entire volume of the pill capsule.

Question 3. Find an example of something that you do NOT know the state of. Describe it, and tell me your best guess of what state it is. Explain your guess.

Answer:

Two examples come to my mind:

  • A paste like Nutella or toothpaste

  • Wax of a candle

Explanation:

I will use the example of Nutella to complete the answer.

Nutella is not a gas because when you open the jar it will not escape and fill the room around it.

When you put Nutella in a plate it will not flow over the whole plate, is it a solid ? But yet you can spread it easyly over a cookie. Is it a liquid?

So, Nutella behaves like a solid until you apply some force over it and then it seems a liquid.

I would guess that pastes are solids because they should have an inner structure that keep the particles together.

If you do some research you will find that pastes are neither liquid nor solids, they are named gels. And gels may be seen as a dispersion of molecules of a liquid within a solid, i.e. in liquid particles dispersed in the solid medium

This sure meets the requirements of this question.

You might be interested in
What is the molarity of a solution that contains 25 g of HCl in 150 mL of solution??
Stels [109]
To find molarity 
1) number of mol of solute.
Solute is HCl.
M(HCl)= 1.0+35.5 =36.5 g/mol

25g *1 mol/36.5 g = 25/36.5 mol HCl

2) Molarity is number of mole of the solute in 1 L solution.
150 mL = 0.150 L

(25/36.5 mol HCl )/(0.150 L) = 25/(36.5*0.150) ≈ 4.57≈4.6 mol/L


3 0
3 years ago
Read 2 more answers
The progress of the reaction:
Blababa [14]

Answer:

The Equilibrium constant K is far greater than 1; K>>1

Explanation:

The equilibrium constant, K, for any given reaction at equilibrium, is defined as the ratio of the concentration of the products raised to their stoichiometric coefficients divided by the concentration of reactants raised to their stoichiometric coefficients.

It tells us more about how how bigger or smaller the concentration of products is to that of the reactants when a reaction attains equilibrium. From the given data, as the color of the reactant mixture (Br2 is reddish-brown, and H2 is colourless) fades, more of the colorless product (HBr is colorless) is being formed as the reaction approaches equilibrium. This indicates yhat the concentration of products becomes relatively higher than that of the reactants as the reaction progresses towards equilibrium, the equilibrium constant K, must be greater than 1 therefore.

6 0
3 years ago
Consider the second-order reaction:
kirza4 [7]

Answer:

Initial concentration of HI is 5 mol/L.

The concentration of HI after 4.53\times 10^{10} s is 0.00345 mol/L.

Explanation:

2HI(g)\rightarrow H_2(g)+I_2(g)&#10;

Rate Law: k[HI]^2&#10;

Rate constant of the reaction = k = 6.4\times 10^{-9} L/mol s

Order of the reaction = 2

Initial rate of reaction = R=1.6\times 10^{-7} Mol/L s

Initial concentration of HI =[A_o]

1.6\times 10^{-7} mol/L s=(6.4\times 10^{-9} L/mol s)[HI]^2

[A_o]=5 mol/L

Final concentration of HI after t = [A]

t = 4.53\times 10^{10} s

Integrated rate law for second order kinetics is given by:

\frac{1}{[A]}=kt+\frac{1}{[A_o]}

\frac{1}{[A]}=6.4\times 10^{-9} L/mol s\times 4.53\times 10^{10} s+\frac{1}{[5 mol/L]}

[A]=0.00345 mol/L

The concentration of HI after 4.53\times 10^{10} s is 0.00345 mol/L.

5 0
3 years ago
I need three examples of objects with high density and three with low density!!
Anuta_ua [19.1K]

Answer:

For example, a suitcase jam-packed with clothes and souvenirs has a high density, while the same suitcase containing two pairs of underwear has low density. Size-wise, both suitcases look the same, but their density depends on the relationship between their mass and volume. Mass is the amount of matter in an object.

5 0
3 years ago
Read 2 more answers
What happens to an electromagnetic wave as it passes from space to matter
Angelina_Jolie [31]
<span>When an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy. The wave may reflect and some part may pass through the matter depending on the amount of energy they have. The amplitude of the wave decreases if some parts of it are reflected. </span>
8 0
3 years ago
Other questions:
  • Plates that are floating on molten<br> 5. The Earth's surface is made of<br> rock.
    12·1 answer
  • In the dilution process of a solution, the moles of ___________ does not change.
    12·1 answer
  • Where are the most reactive metals on the periodic table? to the far right in the middle at the top to the far left
    7·2 answers
  • What are the coefficients needed to balance the equation for the combustion of
    12·2 answers
  • On which body in the Solar system would some life forms from Earth be most likely to survive?
    7·2 answers
  • How many atoms of Cu are<br> in 385 grams?
    11·2 answers
  • An object has balanced forces acting on it. Which of the following describes the result these balanced forces have on the object
    15·1 answer
  • Balance the equation <br> C2H6O+O2 ——&gt; CO2 + H2O
    9·1 answer
  • What is the definition of an Isomer?
    12·2 answers
  • SCIENCE ANSWER ASAP PLEASE!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!