Which is evidence that a chemical Reagan occurred?A. A phase change occurs
B. A new gas is observed in the form of bubbles
C. Red and yellow paint mixing to make orange
D. The temperature of the substance remains constant updates
Answers
To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option B that is a new gas is observed in the form of bubbles.
What is chemical reaction?
Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The characteristics of chemical reaction are:
Evolution of a Gas
Change in temperature
Change in color
Formation of Precipitate
The evidence that a chemical reaction has occurred is a new gas is observed in the form of bubbles.
Therefore, the correct option is option B that is a new gas is observed in the form of bubbles.
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Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain.3NO2 + H2O 2HNO3 + NOHow many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?200.00 mol200.09 mol450.00 mol450.02 mol
Regular copyright is more restrictive than any other kind of license. true or flase
A) synthesis
B) decomposition
C) single replacement
D) double replacement
Answers
Answer:
Double replacement.
Explanation:
In the given reaction, there is not synthesis of compound.
The decomposition reactions are those in which a compound dissociates into simpler molecules or ions.
So the given reaction is not decomposition even.
In single replacement reactions, there is replacement of one group from a compound to other compound or element or ion.
Here two groups are being replaced (sulfate and nitrate) so the given reaction will be classified as double replacement.
Aluminium Nitrate + Salt Cake = Aluminium Sulfate + Sodium Nitrate
Answer D ( double replacement )
hope this helps!
(1) CCl4 (3) C6H12O 6
(2) CH3OH (4) Ca(OH)2
Answers
Answers
In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral.
Answer:
A
An acid and a base
Explanation:
B) coordinates
C) degrees
D) time zones
Answers
Answer is: D) time zones.
Earth is divided into 24 timezones.
Most timezones are exactly one hour apart.
Timezone is a region on Earth bounded by lines of longitude.
Coordinated Universal Time (UTC) is the basis for modern civil time.
For example, UTC±00:00 is the Western European Time (Ireland, Portugal and UK).
UTC+01:00 is Central European Time, West Africa Time.
The earth is divided in 24 time zones. The correct option is D.
What is the earth divided into?
The earth is divided into 24 time zones. Each time zone represents a region where the same standard time is used. These time zones are approximately 15 degrees of longitude wide and are centered on the Prime Meridian (0 degrees longitude).
As the Earth rotates 360 degrees in 24 hours, each time zone covers roughly 1 hour of time difference from its neighboring zones. Time zones are crucial for coordinating activities and scheduling across different regions, ensuring global synchronization and smooth functioning in a world that spans multiple longitudes.
Read more about earth here: brainly.com/question/25624188
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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 = =
= 4.5 g/ml
The density of the sample of liquid with a volume of 130 mL and mass 585 g is
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 .
The formula to calculate the density of the liquid is,
…… (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).
So the density of the liquid with a volume of 130 mL and mass 585 g is .
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.
Answers
Answer:
Explanation:
Substances with giant covalent structures are solids with high melting and boiling points due to the nature of the covalent bonds and the three-dimensional network they form within the crystal lattice. This structure is also often referred to as a network covalent structure. Let's break down the key reasons why these substances have such properties:
1. **Strong Covalent Bonds**: In giant covalent structures, each atom forms strong covalent bonds with neighboring atoms. Covalent bonds involve the sharing of electrons between atoms. This sharing results in the formation of very strong and directional bonds, which require a significant amount of energy to break.
2. **Three-Dimensional Network**: In these substances, the covalent bonds extend in a three-dimensional network throughout the entire structure. This means that every atom is bonded to several neighboring atoms in all three spatial dimensions. This extensive network of covalent bonds creates a robust and interconnected structure.
3. **Lack of Weak Intermolecular Forces**: Unlike some other types of solids (e.g., molecular solids or ionic solids), giant covalent structures lack weak intermolecular forces, such as Van der Waals forces. In molecular solids, weak intermolecular forces are responsible for their relatively low melting and boiling points. In giant covalent structures, the primary forces holding the atoms together are the covalent bonds themselves, which are much stronger.
4. **High Bond Energy**: The covalent bonds in giant covalent structures have high bond energies, meaning that a substantial amount of energy is required to break these bonds. When a solid is heated, the energy provided must be sufficient to overcome the covalent bonds' strength, leading to the high melting and boiling points.
5. **Rigidity and Structural Integrity**: The three-dimensional covalent network imparts rigidity and structural integrity to the substance. This network resists deformation and allows the substance to maintain its solid form at high temperatures, as the covalent bonds continuously hold the structure together.
Examples of substances with giant covalent structures include diamond (composed of carbon atoms), graphite (also composed of carbon atoms but arranged differently), and various forms of silica (e.g., quartz and silicon dioxide). Diamond, in particular, is known for its exceptional hardness, high melting point, and remarkable optical properties, all of which are attributed to its giant covalent structure.
In summary, giant covalent structures have high melting and boiling points because of the strong covalent bonds, the three-dimensional network of bonds, and the absence of weak intermolecular forces. These factors combine to create a solid with exceptional stability and resistance to temperature-induced phase changes.
Final answer:
Substances with giant covalent structures have high melting and boiling points due to the strong covalent bonds that exist throughout their structure. The size of the molecules and the polarizability of the atoms also impact these properties. However, covalent compounds generally have lower melting and boiling points than ionic compounds.
Explanation:
Substances with giant covalent structures are typically solids with high melting and boiling points due to the extensive network of strong covalent bonds that require a lot of energy to break. An example of this would be carbon dioxide (CO₂) and iodine (I₂) which are molecular solids with defined melting points. The size of the molecule impacts the strength of the intermolecular attractions.
Larger atoms have valence electrons that are further from the nucleus and less tightly held, making them more easily distorted to form temporary dipoles leading to stronger dispersion forces. This concept is known as polarizability. Therefore, substances which consist of larger, nonpolar molecules tend to have higher melting and boiling points due to larger attractive forces.
However, compounds with covalent bonds have different physical properties than ionic compounds. Covalent compounds generally have much lower melting and boiling points than ionic compounds, due to the weaker attraction between electrically neutral molecules than that between electrically charged ions.
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