Answer:
its is a subtance
Explanation:
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Coffee is considered a mixture rather than a pure substance because it is made up of multiple components that can be separated. Coffee is a mixture, not a pure substance, due to the variety of components that combine to make it, such as caffeine, water, oils, and other organic compounds.
Explanation:In chemistry, coffee is considered a mixture rather than a pure substance. A mixture is a combination of two or more substances that are not chemically joined together. Coffee is made up of various components such as water, caffeine, oils, and flavor compounds, which can all be separated through various methods.
For example, if you were to run a coffee extraction process using water, you would separate the soluble components of coffee from the insoluble ones. This demonstrates that coffee is not chemically pure but rather a mixture.
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HELP!!!!! a car traveling at a constant 50 miles per hour turns left on the interstate. what is happening here? A) nothing because the speed is constant B) velocity because the direction is changing C) acceleration because speed is constant but, direction is changing D) displacement because the car is moving
Answer is: B) velocity because the direction is changing.
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.
if a hill or Mountain has a high gradient (slope) what happens to the speed of a river flowing downward and the rate of erosion?
Which two forms of heat transfer work together to heat water in a plastic bottle
The two forms of heat transfer that work together to heat water in a plastic bottle are conduction and convection.
Heat transferHeat is transferred through solid materials by a process known as conduction.
In liquids, heat is transferred by convectional currents.
For water in a plastic bottle, heat will first have to travel through the solid plastic bottle by conduction before heating the water inside the bottle by convection.
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Which two structures would provide a positive identification of a plant cell under a microscope? A. cytoskeleton, cell wall B. endoplasmic reticulum, chloroplasts C. chloroplast, large central vacuole D. large central vacuole, flagellum
What is the chemical name and formula of a compound that has one carbon atom and four chlorine atoms?
carbon tetrachloride; CCl4
chlorine carbide; Cl4C
carbon chloride; Cl4C
monocarbon tetrachloride; CCl4
The correct chemical name and formula for a compound that has one carbon atom and four chlorine atoms is carbon tetrachloride, represented by the formula CCl4. Therefore option 1 is correct.
"carbon tetrachloride; CCl4," is the correct answer. Carbon tetrachloride is a compound composed of one carbon atom (C) bonded to four chlorine atoms (Cl).
The prefix "tetra-" indicates that there are four chlorine atoms, and "chloride" refers to the chlorine ion. Therefore, the name "carbon tetrachloride" accurately describes the compound's composition.
Thus, the correct chemical name and formula for a compound with one carbon atom and four chlorine atoms is carbon tetrachloride (CCl4).
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write the symbols for the ions that form when potassium and iodine react to form the ionic compound potassium iodide?
The symbols for the ions that form when potassium and iodine react to create potassium iodide are K+ for potassium and I- for iodine. These ions combine to form the compound with the chemical formula KI.
Explanation:When potassium and iodine react to form the ionic compound potassium iodide, the symbols for the ions involved are K+ for the potassium ion and I- for the iodine ion. Potassium, being in group 1 of the periodic table, loses one electron to form the K+ ion, while iodine, in group 17, gains one electron to form the I- ion. This transfer of electrons results in the formation of an ionic bond between the two ions.
Potassium iodide is represented by the chemical formula KI, indicating that there is a one-to-one ratio of potassium ions to iodine ions in the compound.
Final answer:
The symbols for the ions are K+ for potassium and I- for iodine, which together form the ionic compound potassium iodide (KI).
Explanation:
The symbols for the ions that form when potassium and iodine react to form the ionic compound potassium iodide are K+ and I−. Potassium, which is in group 1 of the periodic table, loses one electron to form a K+ ion. Iodine, on the other hand, is in group 17 of the periodic table and gains one electron to form an I− ion. When these two ions combine, they form the ionic compound potassium iodide (KI).
what is the mass of 4.00 cm3 piece of sodium chloride having a density of 2.16 g/cm3 chemistry
Answer : The mass of sodium chloride is, 8.64 grams
Explanation : Given,
Volume of sodium chloride = [tex]4cm^3[/tex]
Density of sodium chloride = [tex]2.16g/cm^3[/tex]
Formula used :
[tex]\text{Density of }NaCl=\frac{\text{Mass of }NaCl}{\text{Volume of }NaCl}[/tex]
Now put all the given values in this formula, we get mass of sodium chloride.
[tex]2.16g/cm^3=\frac{\text{Mass of }NaCl}{4cm^3}[/tex]
[tex]\text{Mass of }NaCl=8.64g[/tex]
Therefore, the mass of sodium chloride is, 8.64 grams
You see a burning candle. You feel heat above the flame, you see black smoke rising from the wick, and wax melts. List each of the changes that occurred and tell the type of change that caused it.
A burning candle undergoes several changes: heat production, smoke emission, and wax melting. The forming of water vapor and carbon dioxide during heat production and the generation of soot particles during smoke emission are chemical changes. The melting of the wax is a physical change.
Explanation:Three changes occur when you see a burning candle: the production of heat, the emission of smoke, and the melting of wax.
Production of Heat: When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick towards the flame. The heat of the flame vaporizes the liquid wax (turns it into a hot gas) and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, water vapor, and carbon dioxide. This process is an example of a chemical change because new substances (water vapor, carbon dioxide) are formed. Emission of Smoke: This is also a chemical change resulting from incomplete combustion. When the flame doesn't get enough oxygen, it can't totally break the hydrocarbons, resulting in small soot particles that scatter light (black residue). Melting of Wax: The wax near the wick melts due to the heat of the flame. This is a physical change since it involves a change of state (solid wax to liquid), but the chemical composition of the wax stays the same. Learn more about Candle Burning here:
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Which of these is an example of physical change?
Melting a Substance
Breaking chemical bonds
Forming chemical bonds
Nuclear decay
Melting a substance is an example of physical change. Thus option A is correct.
What is physical change?Change is defined as the act, procedure, or outcome of changing: for instance. Change refers to a shift in the weather, transformation refers to a period of profound social change, and substitution refers to a change in the environment.
Change can also be defined as a procedure whereby one or more compounds are chemically transformed into others.
There are two types of changes.
Chemical change - It is defined as a transformation of one material into another, the formation of new materials with distinct properties, and the creation of one or more new substances.Physical change - It is defined as a sort of transformation in which the composition of matter changes but no new material is created. Cutting, bending, dissolving, freezing, boiling, and melting are some of the example of physical change.Thus. melting a substance is an example of physical change. Thus option A is correct.
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a model is any representation of an object or
Which one is a true statement about exothermic reactions?
A. Energy from an outside source is continuously being added.
B. The reaction container always feels cold.
C. The reactants have more heat energy than the products.
D. More heat is given off than is put into the reaction.
How many grams of Hydrogen (H) would need to react with 190 grams of Fluorine (F) to make 200 grams of HF (Hydrofluoric Acid)? Question 6 options: 200 20 10 5
10 g of H₂
Solution:The Balance chemical equation is as follow,
F₂ + H₂ → 2 HF
Step 1: Calculate Amount of F₂ required to form 200 g of HF:
According to balance equation,
40 g (2 mol) HF is formed by = 38 g (1 mol) of F₂
So,
200 g of HF will be formed by = X g of F₂
Solving for X,
X = (200 g × 38 g) ÷ 40 g
X = 190 g of F₂
Step 2: Calculate amount of H₂ to react with 190 g of F₂:
According to equation,
38 g (1 mol) F₂ required = 2 g (1 mol) of H₂
So,
190 g of F₂ will require = X g of H₂
Solving for X,
X = (190 g × 2 g) ÷ 38 g
X = 10 g of H₂
Which one is a true statement about exothermic reactions?
A. Energy from an outside source is continuously being added
B. The reaction container always feels cold
C. The reactants have more heat energy than the products
D. More heat is given off then is put into the reaction
Which of these substances are molecules?
1. H2O
2. NaCl
3. N2
4. O2
Question 12 options:
3 and 4
All of them
1 and 2
None of them
The answer is; All of them
A molecule is a stable chemical unit (with neutral charge) of atoms chemically bonded together (these bonds can be covalent, metallic, ionic, and etcetera). The molecule can, therefore, be of an element (contain atoms of the same element – in this case, N2 and O2) or a compound (atoms of different elements- in this case, H2O and NaCl).
Which of these substances are molecules
Copper is more reactive than calcium. True or false?
Answer;
The above statement is false
Explanation;
Copper is less reactive than Calcium.
This is because Calcium is higher in the reactivity series of metals compared to copper and thus reacts more than copper.
The reactivity series of metals is vital tool that is used in determining the products of displacement reactions and the reactivity of metals in other reactions. The higher the metal is in the reactivity series, the more reactive it is and conversely the lower the metal in the reactivity series the less reactive it is.
In this case, calcium is higher in the reactivity series than copper thus more reactive.
Answer: The given statement is false.
Explanation:
Electronic configuration of calcium is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}[/tex], that is, there are two extra electrons. So, in order to attain stability calcium loses two electrons readily.
Whereas electronic configuration of copper is [tex][Ar]4s^{1}3d^{10}[/tex]. Since, it has completely filled d-orbital so, it is stable in nature and thus, does not react readily.
Therefore, we can conclude that reactivity of calcium is more than copper. That is why, the given statement is false.
Heterogeneous mixtures can be physically separated into their individual components. True False
How does the understanding of the structure of the atom help you see both unity and diversity in forms of matter?
Understanding the structure of atoms reveals unity in the form of consistency of atomic properties within the same element and diversity in the unique structures and behaviors of atoms across different elements. This combination of unity and diversity is essential in explaining the wide range of properties and behaviors observed in different forms of matter.
Explanation:Understanding the structure of an atom provides insight into both unity and diversity of matter. An atom, being the smallest component of an element retains all of the chemical properties of that element, illustrating unity because every atom of the same element is identical and exhibits the same properties. The structure of an atom consists of a nucleus, which is surrounded by electrons.
The nucleus contains protons and neutrons, and these substructures determine the characteristics of atoms including its interactions and stability.Dalton's atomic theory, with its principles of law of conservation of matter and indivisibility, further explains unity in the types and characteristics of atoms across different elements.
On the other hand, diversity is highlighted by different elements having unique atomic structures which produce different types of atoms. This diversity results in vast differences in physical properties across various forms of matter. By observing the atomic substructure, it is possible to understand why some elements are metals, others are nonmetals, and yet others are semiconductors. Furthermore, the behavior of atoms during combinations, for example, ionic or covalent bonding, provides another layer of diversity as it results in a vast array of complex molecules with distinct characteristics.
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How do you know if a reaction is endothermic?
Place the events in order as the temperature of a gas in a container slowly increases .
The events in order as the temperature of a gas in a container slowly increases are -
The molecules of the gas begin to gain kinetic energy.
The fast-moving molecules strike the sides of the container more often.
The molecules striking the sides increase the pressure of the gas.
The molecules of gas use increased energy to move more quickly.
The container breaks open under extreme pressure.
As the temperature of a gas in a container increases, the gas molecules gain kinetic energy and move faster. This leads to more frequent and energetic collisions with the container walls, causing an increase in pressure inside the container.
With further temperature rise, the gas molecules gain even more energy, moving more rapidly and colliding with greater force. If the temperature and pressure exceed the container's structural limits, it may break open.
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describe one way lack of water affect cell function
Vegetable oil has the density of .92 g/mL and honey has the density of 1.42 g/mL. Which liquid will float?
The equation below shows the products formed when a solution of silver nitrate (AgNO3) reacts with a solution of sodium chloride (NaCl).
AgNO3 + NaCl → NaNO3 + AgCl
(Reactants) → (Products)
In this equation, the total mass of the reactants is
A) equal to the mass of AgCl.
B) less than the mass of AgCl.
C) equal to the total mass of the products.
D) greater than the total mass of the products.
In the given equation, the total mass of the reactants is equal to the total mass of the products. Therefore, option (C) is correct.
What is the balanced chemical equation?A chemical equation can be defined as the representation of a chemical reaction in terms of symbols of the substances. A balanced equation consists of reactants, formed products, and an arrow representing the direction of the chemical reaction.
The chemical equation in which the number of atoms of each element participated in the reaction is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass must obey by a balancing of a chemical equation. According to this law, in a chemical reaction, the mass can neither be created nor destroyed.
The total mass on the reactant side should be equal to the total mass on the product side in a balanced chemical equation.
For the given chemical equation total mass of AgNO₃ and NaCl is equal to the total mass of NaNO and AgCl.
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very reactive nonmetal element has most protons in the halogen group
how did ernest rutherford change the atomic model?
He showed that most of an atom's mass was located in the atom's nucleus.
Ernest Rutherford changed the atomic model by postulating that most of the mass of an atom is present in it's nucleus.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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what is the percent composition of the u.s quarter, which has the mass of 5.670g
and contains 5.198g Cu and 0.472g Ni
Final answer:
The percent composition of Cu in the US quarter is approximately 91.72%.
Explanation:
The percent composition of an element in a compound is the percentage of the total mass of the compound that is due to that element.
To calculate the percent composition of Cu in the US quarter, we need to divide the mass of Cu by the total mass of the quarter and multiply by 100.
Percent composition of Cu = (Mass of Cu / Mass of quarter) x 100
Mass of quarter = Mass of Cu + Mass of Ni = 5.198g + 0.472g = 5.670g
Percent composition of Cu = (5.198g / 5.670g) x 100 = 91.72%
Final answer:
The U.S. quarter, with a mass of 5.670g, is composed of approximately 91.67% copper and 8.32% nickel, calculated using the mass of the individual elements and the total mass of the coin.
Explanation:
To find the percent composition of the U.S. quarter with a mass of 5.670g, which contains 5.198g of copper (Cu) and 0.472g of nickel (Ni), you can use the formula:
Percent Composition = (mass of element/mass of compound) × 100%.For copper (Cu): Percent Composition of Cu = (5.198g / 5.670g) × 100% = 91.67%.For nickel (Ni):
Percent Composition of Ni = (0.472g / 5.670g) × 100% = 8.32%.Therefore, the U.S. quarter is composed of approximately 91.67% copper and 8.32% nickel.
1.which of the following correctly describes carbon, represented by c?
It is an element because it is made of atoms that are all the same type
It is a compound because it is made of different types of atoms that are chemically joined together.
It is a mixture because it is made of different type of atoms that are not chemically joined together.
2. Which of the following correctly describe carbon dioxide represented by CO2
It is an element because it is made of atoms that are all of the same types
It is a compound because it is made of different types of atoms that are chemically joined together.
It is a mixture because it is made of different types of atoms that are not chemically joined together.
dust mites are microscopic bugs that are too small to see with the dissecting microscope. to see the details of a dust mite's skin, which of the following microscopes would you use? Please help fast with make brainiest
A.dissecting microscope
B.compound microscope
C.transmission electron microscope
D.scanning electron microscope
I know the answer is not A.
Nevermind got the answer it is D.
The scanning electron microscope is used to see the details of a dust mite's skin. Thus option D is correct.
What is microscope?Microscope is defined as an optical equipment that magnifies an object by using a lens or a combination of lenses.
It can also be defined as an optical equipment consisting of a lens or group of lenses used to magnify images of small things.
There are five types of microscopes.
Simple microscopeCompound microscopeElectron microscopeStereomicroscopeScanning electron microscopeThus, the scanning electron microscope is used to see the details of a dust mite's skin. Thus option D is correct.
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An atom has 16 protons and 16 neutrons. Which of the following could be the symbol for that atom, including its mass numbe? Consult the periodic table.
A. 35CL
B. 32S
C. 32Cl
D. 35S
Answer:
Option b. 32S
Explanation:
Given:
No. of protons = 16
No. of neutrons = 16
Atomic number of an element is equal to the number of protons present in it.
Therefore, atomic number of the element = 16
Mass number of the element is equal to sum of number of protons and neutrons.
Therefore, Mass number = 16 + 16 = 32
Element 'S' has atomic number 16 and its mass number is 32.
So among the given options, option b is correct.
The substance that gets broken down in a homogeneous mixture is the (A)colloid (B)solution (C)solvent (D)solute