Answer: B- molecule
Explanation:
An atom is the smallest entity of a substance which may or may not have independent existence.
Molecule is a pure substance which is composed of similar kind of atoms.It can not be decomposed into simpler constituents using chemical reactions.Example: Hydrogen [tex]H_2[/tex]
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water [tex]H_2O[/tex]
Graphene is a crystalline allotrope of carbon and thus is a molecule as it is made up of similar kind of atoms.
A teacher makes the following statement.
“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”
What topic is the teacher most likely talking about?
distillation of a mixture
filtration of a pure substance
evaporation of a mixture
sorting of a pure substance
Answer:
Distillation of mixture.
Explanation:
Distillation is the process in which we separate the components of a mixture based on the boiling points.
The mixture is boiled and the components separates, lower boiling point substance separates first and then so on.
In petroleum refining fractional distillation is used.
In the given question teacher is talking about the distillation of gasoline or petroleum product.
You are given samples of the elements bromine, chlorine and iodine, each labels A,B, and C. At room temperature (20°C) sample A is solid, sample B is liquid and sample C is gas. What are the identities of these 3 samples?
Final answer:
Given the samples' physical states at room temperature, Sample A (solid) is iodine, Sample B (liquid) is bromine, and Sample C (gas) is chlorine, due to the distinct physical properties of halogens.
Explanation:
To determine the identities of samples A, B, and C, we must consider the physical properties of halogens at room temperature. The given information states that Sample A is solid, Sample B is liquid and Sample C is gas at room temperature. Knowing the room temperature states of halogens, we can match these to iodine, bromine, and chlorine respectively. Here's why:
Iodine is a dark purple-gray solid at room temperature.Bromine is a dark orange liquid with a high vapor pressure, noticeable by its reddish vapor.Chlorine is a greenish-yellow gas, lighter than bromine and iodine, and thus exists as a gas at room temperature.Therefore, Sample A which is solid at room temperature must be iodine, Sample B which is liquid must be bromine, and Sample C which is a gas must be chlorine.
Which contribution is a modification to Thomson's plum pudding model?
A-Atoms are indivisible.
B-Electrons are scattered in an atom.
C-A positively charged nucleus sits at the center of an atom.
D-Atoms of the same element have the same properties.
Answer is: C) A positively charged nucleus sits at the center of an atom.
J.J. Thomson placed two oppositely charged electric plates around the cathode ray. He did experiments using different metals as electrode materials and found that the properties of the cathode ray remained constant no matter what cathode material he used.
Tomson concluded that atoms are divisible and that the corpuscles are their building blocks (atoms are made up of smaller particles).
J. J. Thomson discovered the electron in 1897.
His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.
With this model, he abandoned his earlier hypothesis (the atom was composed of immaterial vortices).
Rutherford theorized that atoms have their charge concentrated in a very small nucleus.
This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).
Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.
That is different from Plum Pudding model, because it shows that most of the atom is empty space.
Answer:
C-A positively charged nucleus sits at the center of an atom.
Explanation:
The 'plum-pudding' model was put forth by J.J Thomson to explain the structure of an atom. According to the model, the electrons which are negatively charged particles are essentially dispersed in cloud of positive charges. This was later modified by his student Rutherford through the goil foil experiment.
Rutherford's experiment essentially suggested that the positive charges are concentrated in a core or the center of an atom while the electrons move around it in fixed orbits.
What about matter can change and what does not change according to the law of conservation?
Final answer:
The Law of Conservation of Matter states that the total mass of matter remains constant in a closed system, despite undergoing physical or chemical changes. In a nuclear reaction, there's a significant conversion between matter and energy, but the total content of matter and energy combined remains fixed.
Explanation:
The Law of Conservation of Matter is a fundamental principle in chemistry stating that the total mass of matter remains constant during any chemical change. Matter undergoes various transformations, such as a chemical change or a change in state from solid to liquid or gas. However, during these changes, the matter is neither created nor destroyed. The reconfiguration of atoms and the conversion of substances, such as during the brewing of beer or in the operation of batteries, illustrates this principle. In both examples, the mass and number of atoms before and after the reaction remain unchanged, embodying the conservation of matter.
However, when considering nuclear reactions, the scenario is different. Here, the energy changes are so vast that there is a measurable change in mass, showcasing a matter-energy conversion. This advanced topic aligns with the principle that the total quantity of matter and energy in the universe remains fixed. To summarize, whether considering the conversion of glucose to ethanol and carbon dioxide during brewing or the change in substances within a lead-acid car battery, the law maintains that matter can change form but is neither created nor destroyed in a closed system.
Which best describes the role of a secondary consumer in a food web?
Carnivore that feeds on producers
Herbivore that feeds on producers
Herbivore that feeds on primary consumers
Carnivore that feeds on primary consumers
d is the answer :) hpe for D
Final answer:
A secondary consumer in a food web is a carnivore that feeds on primary consumers, indirectly obtaining energy from plants and residing on the third level of the food chain. They play a crucial role in ecosystem balance.
Explanation:
The role of a secondary consumer in a food web is best described as a carnivore that feeds on primary consumers. Secondary consumers get their energy indirectly from plants by consuming herbivores. These carnivores are on the third level of the food chain and play a critical role in transferring energy from plants to higher trophic levels. For example, a lion, which eats herbivorous animals such as zebras, is a secondary consumer. Secondary consumers may also be omnivores that, along with primary consumers, consume producers directly. It's important to note that secondary consumers are essential components of an ecosystem, helping to maintain balance by controlling the population of herbivores, thus preventing overgrazing and depletion of plant life.
Where is most of the high-level waste from nuclear reactors stored?
WILL GIVE BRAINIEST.
the ocean
abandoned salt domes
at reactor site
natural caves
After analyzing rock core samples in an area with frequent earthquakes, many geologists believe a severe earthquake will occur in the area in the next 50 to 80 years. Other geologists, however, believe that such a prediction cannot be determined from the data collected. If these two groups of scientists have access to the same data, how can they form such different hypotheses?
A. Geologists manipulate data to fit their hypotheses, which results in different conclusions.
B. Scientific predictions must list every possible outcome to make sure that they are never incorrect.
C. Geologists have different specialties that can cause them to interpret data differently.
D. Scientific hypotheses need to be proven many times, so predictions of earthquakes are probably incorrect.
Answer: C. Geologists have different specialties that can cause them to interpret data differently.
Explanation:
The data is the outcome of a research study that is obtain after the implementation of the experimental methodology or by direct observation. The interpretation of data can vary among the scientists as they may have different perspective, knowledge and experience.
Thus according to the given situation, on the examination of rock samples in an area which exhibit frequent earthquakes, one type of geologists believe that a severe earthquake will occur and others believe that the prediction cannot be known by the data. This is indicating towards the fact that geologists in the given study may have different expertise, knowledge and perception which make them to interpret the data differently.
Where should the author of a case study introduce the central question of the text?
The author of a case study should introduce the central question in the beginning of the text.
What is a case study?
Case study is an examination on a particular case, be it person, group, or event, in real world context. It will be based on a particular central question. So, the case study is mainly intended to answer the central question.
The central question is the question that can be asked about the topic in the first part of the case study.
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An imaginary gas which perfectly obeys the gas law in a(n)
An imaginary gas which obeys that gas law is called an ideal gas. Details about ideal gases can be found below.
What is an ideal gas?Ideal gas in chemistry refers to a hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.
In other words, an ideal gas is said to obey the gas laws and do not interact with each other.
Therefore, it can be said that an imaginary gas which obeys that gas law is called an ideal gas.
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which of these is an example of biomass fuel?
A oil
B natrual gas
C wood
D coal
???HELP ill give good ratings if it helps me
What is the symbol for molarity?
The answer in chemistry is mol/L and altho it is represented by the symbol M usually.
Answer:
the answer is "M"
Explanation:
capital M not lower m
how can deforestation Both decrease the amount of oxygen in the atmosphere and increase the amount of carbon dioxide in the atmosphere
Which of the following organisms are carnivores?
Consumers
Decomposers
Omnivores
Producers
Answer:
consumers
Explanation:because they depend on the producers
Carnivores are the organisms that eat other animals and among the options provided, only 'carnivores' accurately hit the mark. Consumers, decomposers, and producers are classifications of organisms based on their source of food and method of energy acquisition, but only carnivores specifically feed on other animals.
Explanation:Which Organisms are Carnivores?
Among the options provided, carnivores are the organisms that feed on animals, either herbivores or other carnivores. Examples of carnivores include lions, polar bears, hawks, frogs, salmon, and spiders. Some carnivores are obligate carnivores, meaning they can only eat animals because they cannot digest plants, while other carnivores can digest both but primarily consume animal matter.
Consumers are organisms that depend on other organisms for food and include all animals, which means they can be herbivores, omnivores, or carnivores. Decomposers, like fungi, are actually consumers that break down dead organisms for energy but do not fit the category of carnivores. Producers, such as plants, are the base of food chains and are not considered carnivores as they produce their own food via photosynthesis. Omnivores consume both plants and animals, examples include humans and bears, but they are not exclusive carnivores.
Which of the following is true during an exothermic reaction?
Heat is created.
Heat is released.
Heat is destroyed.
Heat is absorbed.
need help as fat as u people can help me
The statement which is true during an exothermic reaction is that is Heat is released. (option B)
Endothermic reactionEndothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products substances
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What is the symbol for molarity?
The standards used to make a judgment or decision when designing a product are called _______. A. prototypes B. criteria C. designs D. investigations
If an atom’s mass number is 210 and its atomic number is 85, how many neutrons does it have?
Answer:
the answer is 125, i got this right
Magnesium, calcium, and strontium are examples of ____________. A) non-metals B) alkali metals C) transition metals D) alkaline earth metals
Answer:
D) Alkaline earth metals.
Explanation:
The alkaline earth metals are the metals of the group 2 in the periodic table.They are 6 elements in this group.They have similar properties such as: they are silvery-white, shiny, ans reactive at STP.The alkaline earth metals in group 2 of the periodic table are: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).So, Magnesium, calcium, and strontium are examples of Alkaline earth metals.What contains pigments that absorb light energy
40cm^3 of oxygen are reacted with 40cm^3 of carbon monoxide. what are the volumes of the gases remaining, measured at the original temperature and pressure? (pls help )
Although you can see the pencil, it appears broken in the glass of water. This is because
A) electromagnetic waves cannot travel through solids.
B) electromagnetic waves travel at different speeds through different media.
C) electromagnetic waves compress more when they travel through denser media.
D) electromagnetic waves get closer together when they go through dense media like glass.
An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?
Answer:
density changed would be the answer
Explanation:
Which structure supports the formation of a snowflake
Examine the reactants of the incomplete synthesis reaction. 2Mg + O2 → __________.
Which of the answer choices correctly predicts the product of the synthesis reaction?
O2 + 2Mg
Mg + Mg + O2
2MgO
O2Mg
Answer: [tex]2MgO[/tex]
Explanation:
Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
Thus the products of chemical reaction will be [tex]2MgO[/tex]
I was out and I don't know any of this
Match each base with its common use.
1.magnesium hydroxide A.laxative
2. sodium hydroxide B.soap
3. calcium hydroxide C.plaster
4. aluminum hydroxide D.deodorants
5. ammonium hydroxide E. household cleaner
Answer:
Many hydroxides find applications in everyday household items.
For example, Magnesium hydroxide is used as laxative. It can be consumed for this.
Sodium hydroxide is used as soap. The sodium hydroxide is melted, the essential oils are added and the soap is formed on cooling.
Calcium hydroxide is used as plaster.
Aluminium hydroxide is used as deodorant. It plugs the sweat pores to prevent more sweat.
Ammonium hydroxide is used as household cleaner. Ammonium hydroxide dissolves grease and other dirt.
Answer:
the answer is calcium hydroxide
Explanation:
cause it is bro trust me
The idea of arranging the elements in the periodic table according to their chemical and physical properties is attributed to
A vertical column of elements in the periodic table is called a ...
The vertical columns on the periodic table are called groups or families.
Explanation:The vertical columns on the periodic table are called groups or families. Elements within the same group share similar chemical properties due to their identical outer electron configurations. There are 18 groups in the modern periodic table, each denoted by a number or a specific name.
Elements in the same group often exhibit comparable reactivity and bonding characteristics, providing a systematic way to understand and predict the behavior of elements. This grouping facilitates the organization of elements based on their shared characteristics and contributes to the periodic table's utility in chemistry.
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Cathy’s favorite salad dressing is a liquid with particles of salt, pepper, and garlic. When comparing a spoonful of salad dressing to a cell, what would the liquid be equivalent to? What would the particles be equivalent to? The liquid would be equivalent to cytoplasm or oil or water .The particles would be equivalent to objects or organelles organs
Answer:
The liquid is proportional to cytoplasm and the particles would be proportional to organelles.
Explanation:
The cytoplasm in cell biology refers to all the substances inside a cell, enveloped by the cell membrane. The majority of the activities in the cell occurs inside the cytoplasm. The cytoplasm comprises about 80 percent of water and is generally transparent.
On the other hand, a tiny cellular composition, which does unique activities inside a cell is known as an organelle. The organelles are enclosed inside the cytoplasm of both prokaryotic and eukaryotic cells.
How is a pure substance different from a mixture?
A. Mixtures can be seperated by physical means.
B. Pure substances are made up of mixtures.
C. A pure substance is heterogeneous.
D. A mixture is made of one substance.
It is A the answer is A and I'm doing homeschooling and I do quizzes and I got a A on it so the answer is A