Answer:
Color Change.
Production of an odor.
Change of Temperature.
Evolution of a gas (bubbles)
Precipitate (formation of a solid)
There are 5 so you can choose 4.
The four signs that a chemical reaction has occurred are as follows:
Change in color.Alteration in temperature.Change in the state along with precipitation.The evolution of gas in form of bubbles. What is a Chemical reaction?A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.
Every chemical reaction involves the four signs which are mentioned above. These signs are delivered by chemical reactions along with determined products. But the mass of the reactants and products always remains the same. Precipitation is only visualized in specific reactions with the possessions of certain characteristics.
Therefore, the four signs that a chemical reaction has occurred are well-mentioned above.
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How many valence electrons do Oxygen has
Answer:
6
Explanation:
As water moves through the water cycle, the total amount of water on Earth *
increases
decreases
stays the same
fluctuates with the seasons
Answer: Stays the same
Explanation:
The amount of water on the earth never leaves or runs out, so there will always be water. When water disappears, its just the process of evaporation. When water is evaporated into water vapor (gas state of matter), and the molecules are scattered through the air. Making the air humid, although you can not see the molecules, not even with a microscope.
Copper is an element that is used in electrical wires. What is the smallest unit of copper that maintains the characteristics of copper?
the atoms
O the proton
O the nucleus
O the electron
O the atoms
Answer:
I believe it is the last option: atoms
I’m very confused...
Answer:
D. in Carbon dioxide released by factory's in to the atmosphere
Explanation:
hope this helps.
Answer:
I think in B drinking water supplies
or D.
Explanation:
it had to be D instead
10 pts.
Please help me with my Chemistry question. :'(
plz.
Answer:
dang this hard I don't understand...
Manny kicked a 2kg soccer ball at a rate of 5m/s. What is the KE of the ball???
Answer:
25
Explanation:
This questoin about physics but solution is there
Kinetic energy = 1/2 . m. V. V
m=weight
V=velocity
1/2 . 2. 25 = 25
Which best explains how the body maintains homeostasis? All systems work together to stabilize the body. Each system works independently to stabilize the body. All systems work together to match the external environment. Each system works independently to match the external environment.
Answer:
All systems work together to stabilize the body.
Explanation:
Homeostasis refers to the ability of the body to maintain a stable internal state despite the changes in the external environment. Among the options, option A, explains it bests.
Option B: This answer is partly correct in the sense that stability is achieved, however the systems work together and not independently.
Option C: This option is wrong. Stability is the goal and not matching the external environment.
Option D: This option is wrong. Stability is the goal and not matching the external environment.
The best explains how the body maintains homeostasis is all systems work together to stabilize the body.
What is homeostasis?Homeostasis is a condition in which a biological system changes its condition suitable to the environment. It is needed to survive and function properly.
Thus, the correct option is A.
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All plants and animals contain carbon
True or False?
Answer:
true.
Explanation:
Carbon is an essential element for all life forms on Earth. Whether these life forms take in carbon to help manufacture food or release carbon as part of respiration, the intake and output of carbon is a component of all plant and animal life. Carbon is in a constant state of movement from place to place.
What is the molar mass of (NH4)2CO3
Answer:
96.11 g/mol
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableExplanation:
Step 1: Define
(NH₄)₂CO₃
Step 2: Identify
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Step 3: Find
Molar mass of (NH₄)₂CO₃ - 2(14.01) + 8(1.01) + 12.01 + 3(16.00) = 96.11 g/mol
Answer: 96 g is the molar mass of (Nh4)2CO3
Explanation:
How do you find the significant figure of 505kg-450.25kg
Answer:
4 significant figures
Explanation:
505 has 3 significant figures
450.25 has 5 significant figures
First do simple subtraction
505 - 450.25 =54.75
And then evaluate any number that has significance or is important if the decimal were to be moved.
4 significant figures
How many moles of tin atoms are in a pure tin cup with a
mass of 38.1 g?
Answer:
0.32mole
Explanation:
Given parameters:
Mass of tin cup = 38.1g
Unknown:
Number of moles in the cup = ?
Solution:
To find the number of moles, use the expression below;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass = 118.7g/mol
So;
Insert the parameters and solve;
Number of moles = [tex]\frac{38.1}{118.7}[/tex] = 0.32mole
What property of matter does not change even though the appearance may change?
Answer:
The law of the conservation of mass states that matter is neither created nor destroyed, only converted to other forms. Therefore, the mass never changes, even if its appearance does.
Explanation:
9. Frontal Lobe is responsible for? M
(5 Points)
artistic expression
sensory information
visual information
O coordination and motor movement
Answer:
Artistic expression
Explanation:
Think of it as the control panel of our personality and our ability to communicate
Atomic #
Mass #
#p
#e
#n
charge
Symbol
1) 17
19
0
2)
180
71
109
3)
40
38
46
4) 92
238
86
206
5)
Pb4
82
6)
34
45
-2
7)
113
48
49
8) 21
42
0
31
9)
p.
15
10)
83
80
126
In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
identify the type of bond shown in the figure. explain your reasoning.
Answer:
could you please provide more info for the question you want an answer for?
Explanation:
IF CONSTRUCTIVE INTERFERENCE PRODUCES A WAVE WITH
GREATER AMPLITUDE, THIS MEANS THE WAVE IS BIGGER OR
SMALLER?
Answer:
This means that the wave is bigger because amplitude is the hight of the crest of the wave!
Explanation:
SO IT MEANS THE WAVE IS BIGGER AND TALLER :D
asap if right brainly pls help
Answer:
mountains and continental drift seafloor spreading
Explanation:
A
B
C
Help
How are nuclear reactions different from chemical reactions?
Answer:
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical changes involve only a rearrangement of electrons.
Explanation: Hope this helps
Brainliest?
Answer:
Chemical Reaction
Atoms are rearranged during a chemical change to create a new substance The new substance is formed during a chemical reaction cannot be changed back to its original state During a chemical reaction, the chemical bonds are broken and new chemical bonds form
Nuclear Reactions
Nuclear reactions are defined as the reaction in which there occurs change in the nucleus of an atom due to change in number of protons or neutrons of an atom.
Explanation:
I NEED HELP IM ON TIMER
A base is added to water. What happens when the position of equilibrium lies to the left?
The base is completely dissociating into products.
The base is partially dissociating into products.
The base is not dissociating into any ions.
The base is present in very small amounts.
Answer:
Option 2 or B
Explanation:
The base is partially dissociating into products.
HAVE A GREAT DAT STAY SAFE!
The correct answer is: The base is not dissociating into any ions.
When the position of equilibrium lies to the left, it means that the equilibrium favors the formation of the reactants rather than the products. In the context of a base being added to water, it implies that the base does not dissociate significantly into ions or dissociates only to a small extent.
When a base is added to water, it can undergo a process called ionization or dissociation, where it breaks apart into ions. In the case of a strong base, such as sodium hydroxide (NaOH), it completely dissociates into its constituent ions (Na+ and OH-) in water. This means that all the base molecules break apart, and a high concentration of ions is present in the solution.
However, if the base is weak or the equilibrium lies to the left, the base molecules do not dissociate significantly into ions. This can be due to factors such as the nature of the base or the conditions of the reaction. In such cases, only a small fraction of the base molecules dissociate into ions, and the concentration of ions in the solution is relatively low.
Therefore, when the position of equilibrium lies to the left, it indicates that the base is not dissociating into any ions or is dissociating only to a small extent. The base remains mostly in its molecular form and is present in the solution in relatively small amounts.
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55. Which is a characteristic of all ions? (1 point)
They are made of one type of atom.
They have one overall charge.
They are made of two or more types of atoms.
They have two or more overall charges.
Answer:
I do believe it's they have one overall charge. Not sure though.
Explanation:
please help, 15 points
1rst is D, second is A
Explanation:
When a substance goes from a liquid to a gas, this process is considered a what
Answer:
Evaporation
Explanation:
Answer:
Boiling
Explanation:
The temperature at which a liquid begins to boil is called the boiling point (bp).
Which number is the subscript in the following formula?
2Li3N4-
- 2
- 3
- 4
Answer:
4
Explanation
It states there is two before the Li, and I ruled out three because four is the only number that goes after the particles that stands alone, the three means that there are three particles of N4
What is the density of nitrogen gas if 0.186 g occupies a volume of 110 mL?
Answer:
[tex]d=1.69\times 10^{-3}\ g/mL[/tex]
Explanation:
Given that,
Mass, m = 0.186 g
Volume occupies, V = 110 mL
We need to find the density of Nitrogen gas. The mass per unit volume is called density of an object. It is given by the formula as follows :
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{0.186\ g}{110\ mL}\\\\=1.69\times 10^{-3}\ g/mL[/tex]
So, the required density is [tex]1.69\times 10^{-3}\ g/mL[/tex].
Methanol and ethanol are said to be miscible in one another. What does this tell you?
Answer:
That they are miscible in one another
Why do atoms with greater numbers of protons have greater electronegativity?
Answer:
the positivity charged protons in the nucleus attract the negatively charged elections.bas the number of protons in the nucleus increases, the electronegativity or attraction will increase
How is the movement of the electrons different when the atoms are close?
Answer: The electrons move around between the two atoms. their positive nuclei repel each other. A covalent bond is an electric force of attraction between two atoms that share outer electrons.
Explanation: I hope that helps.
For better understanding let's explain what the statement means.
Always know that movement of the electrons often differs when the atoms are close because then electrons are said to be inclined or attracted to the other proton only when both protons are closer and the results of what happens if an individual moves the atoms very close to each other they will automatically repel or push away from each other because the same charge is present in themFrom the above we can therefore say that the answer the movement of the electrons different when the atoms are close because when two atoms are very close to each other, the electrons of each atom will then be attracted to both nuclii. If the atoms tries to get two close then the nuclii will repell each other is correct
Learn more about Electron movement from:
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Carbon can react with oxygen to form carbon dioxide. Which of the following statements about this chemical change is true?
Carbon can react with oxygen to form carbon dioxide. Which of the following statements about this chemical change is true? ... Carbon and oxygen atoms are destroyed as new atoms are formed. Carbon and oxygen atoms have the same properties as molecules of carbon dioxide.
As Mia mixed two substances in a test tube, she noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, what was most likely occurring inside the test tube?
Answer:
This question lacks options. The options are:
A. The two substances underwent a physical change
B. The two substances were melting
C. A new substance was forming
D. A change in the mass of the two substances
The answer is C
Explanation:
Changes in chemistry can either be physical or chemical. A physical change as the name implies does not alter the chemical content of the susbtances involved. However, chemical changes affect the chemical composition of the substances, hence, new substances are produced.
A chemical change is also characterized with a color change, temperature change, gas evolution etc. In this question, Mia mixed two substances in a test tube and noticed that the test tube became warm, gas came out from the test tube. This implies a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCES.
What occurs during the recharge process? Why is recharging with a salt brine solution that
contains sodium chloride (NaCl) necessary?
(This question refers to hard water treatment)
Answer:
During the recharge process, the water infiltrates at the land's surface and flows through the unsaturated zone. It then crosses the water table and enters the groundwater system. Chloride (NaCl) is important and necessary because the sodium ions are held loosely and exchanged easily with calcium and magnesium ions.
Explanation:
