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List the different signs that tell you a chemical reaction may have occurred.
Then for each sign, write down TWO examples from day to day life where you have seen these reactions occur. (you should have 10 total; try to come up with examples on your own. although you may have to research the one where a solid is formed.)

Answers

Answer 1

Answer:

Color Change.

Production of an odor.

Change of Temperature.

Evolution of a gas (formation of bubbles)

Precipitate (formation of a solid)

Chicken turning color

Explanation:

I have when i have put a mint in the coke and it exploded and then another is when i dyed my water purple for no reason and when i heat water it start do evaporate or bubble and water turning into ice and when you know  you cook chicken the chicken is pink then when you season the chicken it turn golden brown and when you put milk and cereal together and if you leave it in to long it get soggy.


Related Questions

what is chemical bonding?​

Answers

Answer:

Chemical bonding - a mutual adhesion of atoms in an molecule and the crystal lattice.

Explanation:

Hope you have a great day

The best way to increase the amount of a solid solute dissolved in a saturated solution would be to

Answers

Answer:

The solubility of a saturated solution can be increased by increasing the temperature.

Explanation:

Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.

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Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*​

Answers

Explanation:

According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.

For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]

Mass of Na = 23 g/mol

Mass of Cl = 35.5 g/mol

Sum of mass of reactants = mass of Na + mass of Cl

= 23 + 35.5 g/mol

= 58.5 g/mol

Mass of product formed is as follows.

Mass of NaCl = mass of Na + mass of Cl

= (23 g/mol + 35.5) g/mol

= 58.5 g/mol

As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.

As a result, law of conservation of mass is obeyed.

what do electrons in the same shell have in common

Answers

Answer:

 They have the same amount of energy. They are all positively charged. They are all made up of atoms.

Answer:

they have the same quantity of energy...

How many grams of copper (II) oxide will react with 10 liters of hydrogen gas?​

Answers

Answer:

maybe 200g

I don't know thats just a guess

HOPE ITS TURE



How many pairs of electrons are shared by adjacent carbon atoms in an alkane?

Answers

Answer:

one

Explanation:

So, the number of pair of electrons are shared between two adjacent carbon atoms in a saturated hydrocarbon is 1

When you mix water and salt you get a. ​

Answers

Salt water , from the ocean

Birds use their feathers for flight and fluff their feathers to keep warm. Based on Natalia's feather experiment, how do oil spills affect birds’ ability to use their feathers?

Answers

A new study finds that even small smudges of oil can have huge impacts on flight and a bird's energy budget. ... For seabirds, oil can sink their natural buoyancy and literally drag them into a watery grave. And the birds that try to clean themselves ingest a sticky poison that ravages their livers, lungs, and intestines.

Answer:

As shown previously on Natalia's experiment, oil spills will dangerously affect birds' abilities to user their feathers. When oil gets on a feather, the mass of it increases and it becomes soggy and wet. If birds try to go in water like the ocean, it will not get any better because the ocean is cold. Flying won't be easy because they have additional weight stuck to them.

Explanation:

Hope this helps you!

how many carbon atoms are in 26-hydrogen alkyne

Answers

An alkyne contains four carbon atoms.... so if you do 26 multiplied by 4 it equals 104... I do not know if that’s the answer so I apologize if it’s wrong :,)

If I have 6 moles of a gas at a pressure of 10.6 atm and a volume of 48 liters, what is the temperature of this gas?
An unknown quantity of gas is at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of 97 0C, how many moles of gas exist in this situation?

Answers

Answer: 1). The temperature of this gas is 1032.88 K.

2). There are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].

Explanation:

1). Given: No. of moles = 6 moles

Pressure = 10.6 atm

Volume = 48 L

Formula used to calculate temperature is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 atm

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\10.6 atm \times 48 L = 6 mol \times 0.0821 L atm/mol K \times T\\T = \frac{10.6 atm \times 48 L}{6 mol \times 0.0821 L atm/mol K}\\= \frac{508.8}{0.4926} K\\= 1032.88 K[/tex]

Hence, temperature of this gas is 1032.88 K.

2). Given: Pressure = 14.5 atm

Volume = 45 L

Temperature = [tex]97^{o}C = (97 + 273) K = 370 K[/tex]

Formula used to calculate number of moles is as follows.

[tex]PV = nRT\\14.5 atm \times 45 L = n \times 0.0821 L atm/mol K \times 370 K\\n = \frac{14.5 atm \times 45 L}{0.0821 L atm/mol K \times 370 K}\\= \frac{652.5}{30.377} mol\\= 21.48 mol[/tex]

Hence, there are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].

what does climate change have to do with glacial change ​

Answers

Answer:

Because glaciers are so sensitive to temperature fluctuations accompanying climate change. so if it gets hotter then the ice glaciers will melt.

Explanation:

Which of the following is not a fossil fuel?

o copper
natural gas
O petroleum
O coal

Answers

Answer:

copper

Explanation:

coal, petroleum, and natural gas are all related to fossil fuels.

Copper is not a fossil fuel and the correct option is option 1.

What are fossil fuels?

Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure.

Fossil fuels are a non-renewable source of energy. Most of the energy used by us is obtained by the burning of fossil fuels. These fossil fuels are used up at a faster rate. They cannot be regrown at a scale compared to their consumption.

Therefore, Copper is not a fossil fuel and the correct option is option 1.

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On the left a Circuit A, which is a square box. The top, left, and right sides have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short. On the right a Circuit B, which is a square box. 2 extra lines cross the box near its top, parallel with the top side. The top side and the 2 extra lines have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short.
Use the diagram and drop-down menus to answer each question.

Which circuit is a parallel circuit?

Which circuit is a series circuit?

In which circuit do the light bulbs all shine at their maximum brightness?

Answers

Answer:

B A B  sorry if its wrong

Explanation:

Circuits can be connected in series or parallel but the maximum voltage is obtained in series connection, thus, light bulbs shine brightest in series connection.

What is parallel and series connection in a circuit?

A parallel circuit connection is one in which the terminals of all the components in th circuit meet at two points.

The components are parallel to each other and current flows in multiple directions.

A series connection in a circuit is one in which the terminals of the component parts in a circuit are joined end to end. Current flows in one direction.

The voltage in a series connection is the sum of all the individual cells, therefore, the light bulb in series connection shines brightest.

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How many moles are in 2.8x10^24 atoms of silicon?

Answers

Answer:

4.6 mol Si

General Formulas and Concepts:

Atomic Structure

Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 2.8 × 10²⁴ atoms Si

[Solve] moles Si

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[DA] Set up:                                                                                                   [tex]\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})[/tex][DA] Divide [Cancel like units]:                                                                        [tex]\displaystyle 4.64962 \ mol \ Si[/tex]

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.64962 mol Si ≈ 4.6 mol Si

A heterogeneous mixture always contains
only one substance.
O more than two substances.
O two or more substances that are visibly distinguishable.
O two or more substances that are not visibly distinguishable.

Answers

Answer:

two or more substances that are visibly distinguishable.

How many moles of NO are made from
mixing 7.2 moles of NH3 and 9.6 moles
of O? Identify the limiting reagent.

Answers

Answer:

216 g of NO

Explanation:

We begin from the reaction:

4NH₃ + 5O₂ →  4NO  + 6H₂O

We determine the limiting reactant with the moles of each reactant:

4 moles of ammonia react to 5 moles of oxygen

Our 7.2 moles of ammonia may react to (7.2 . 5) /4 = 9 moles

It's ok because we have 9.6 moles of oxygen. 0.6 moles still remain.

5 moles of oxygen react to 4 moles of NH₃

Our 9.6 moles of oxygen may react to (9.6 . 4) /5 = 7.68 moles

We only have 7.2 moles of NH₃ and we need 7.68; so there is no enough ammonia and that's our limiting reagent.

Now we determine the moles of product.

4 moles of ammonia can produce 4 moles of NO

Definetely our 7.2 moles, will produce 7.2 moles of oxide.

We convert to mass: 7.2 mol . 30 g/mol = 216 g

Would an alkali metal make a good replacement for tin in a tin can? Explain.

Answers

Answer:

No

Explanation:

If tin is heated, it can react with alkalis' with the release of hydrogen.

Tin is a great metal that is used for packaging purposes.

It does not react with any acid that may be present in the food material stored inside the tin can which makes it a useful metal. It keeps the food safe.

However, if the tin in the tin can is replaced with alkali metals then they will readily react with the acid present in the food materials stored inside, thereby rendering the food unsafe.

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In which reaction are the atoms of elements rearranged?

Answers

Explanation:

A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.

In a chemical reaction, the atoms and molecules that interact with each other are called reactants.

In a chemical reaction, the atoms and molecules produced by the reaction are called products.

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Answer:

It is B

Explanation:

The formation of water is a chemical reaction which rearranges atoms. The other reactions are nuclear reactions.

What do plants do with sugar? *


Release it through their stoma

Eat it for energy

Convert it into oxigen

Convert it into water

Answers

Answer:

its B .Eat it for energy.

True or False: Molecular formula gives you the smallest whole number ratio of elements in a compound. *

Answers

Answer:true

Explanation:The molecular formula indicates the exact number of atoms in the molecule. The empirical formula expresses the smallest whole number ratio of the atoms in the element.

How many electrons does GeH4 have

Answers

I do not know this question
36 electrons. You multiply the atomic number by the number of atoms and then add them.
Ge has 32 electrons. H has 1 electron.
32 + 1(4) = 36

What is the hydroxide ion concentration of a solution with a pH of 4?

A. 1x10^-4
B. 1x10^-7
C. 1x10^-14
D. 1x10^-10

Answers

Answer:

Jules

Explanation:


How do textbooks usually describe Le Châtelier's famous principle

Answers

Answer:is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system

Explanation:

What will the volume be of 50 moles of helium at 25°C and 2.5 atm?​

Answers

The answer for this question would be 6 L

Organisms that depend on other organisms for food are consumers. Which consumer you think is a herbivore (eats plants only)?

Answers

Answer:

Prairie dog#3

Explanation:

:)

Find the total pressure (in atm) of a mixture that contains 3 gases with the following partial pressures. Gas A is 4.2atm, Gas B is 780 mmHg, Gas C is 250.00kPa

Answers

Answer: The total pressure of given mixture that contains 3 gases is 7.68 atm.

Explanation:

Given: Partial pressure of gases is:

Gas A = 4.2 atm

Gas B = 780 mm Hg

Convert mm Hg into atm is as follows.

[tex]1 mm Hg = 0.00131579 atm\\780 mm Hg = 780 mm Hg \times \frac{0.00131579 atm}{1 mm Hg}\\= 1.02 atm[/tex]

Gas C = 250 kPa

Convert kPa into atm as follows.

[tex]1 kPa = 0.00986923 atm\\250 kPa = 250 kPa \times \frac{0.00986923 atm}{1 kPa}\\= 2.46 atm[/tex]

Total pressure is the sum of partial pressures of gases present in the mixture.

Therefore, total pressure of given mixture is calculated as follows.

[tex]P_{total} = P_{A} + P_{B} + P_{C}\\= 4.2 atm + 1.02 atm + 2.46 atm\\= 7.68 atm[/tex]

Thus, we can conclude that the total pressure of given mixture that contains 3 gases is 7.68 atm.

Help i’m taking a test!!
What new element is formed from the equation below? (Answer form is
MN:, AN: , S)

Answers

Answer:

Element Z

Explanation:

I hope this is correct and helps you!

A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine is

Answers

I think it’s 40% but I’m not sure

A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy, then efficiency of the engine is 25%.

How do we calculate efficiency?

We can calculate the efficiency by using the below equation as:

Efficiency = (Actual production / Theoretical production) × 100%

Given that,

Actual production = 604 kJ

Theoretical production = 2,416 kJ

On putting values in given equation, we get

Efficiency = (604/2,416) × 100% = 25%

Hence efficiency of the engine is 25%.

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What is the percent by mass of carbon in carbon dioxide (CO2)?
A. 27%
B. 33%
C. 43%
D. 73%

Answers

The answer is going to be a.27

True or False?

When it is summer in the Northern Hemisphere, it is summer all around the word

Answers

True.................
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