In the chemical symbol for nitrogen gas, N2, what does the “2” represent?
Anton van Leeuwenhoek made his own version of the microscope and discovered something very odd when he looked at the gunk on his teeth. What did he discover?
Anton van Leeuwenhoek discovered tiny, single-celled organisms known as animalcules, now identified as bacteria, by examining dental plaque under his homemade powerful simple microscope.
Explanation:Anton van Leeuwenhoek, often referred to as the Father of Microbiology, made groundbreaking discoveries using a microscope he crafted himself. One of his most notable findings was when he examined the plaque from his own teeth. What he saw were tiny living organisms with a single cell, which he termed animalcules, now known as bacteria. His simple microscopes, through his superior lens-making skill, were almost as powerful as modern light microscopes. Leeuwenhoek's microscopes provided better resolution than other microscopes of his time, enabling him to observe human cells and bacteria closely. The discovery of these microorganisms laid the foundations of microbiology, a field that has evolved significantly since his time.
Anton van Leeuwenhoek discovered bacteria, which he called animalcules, with self-made microscopes almost as powerful as modern ones, marking a seminal event in microbiology.
Explanation:When Anton van Leeuwenhoek examined the plaque from his teeth under his homemade microscope, he discovered tiny living entities, which he named animalcules ("tiny animals"). These observed organisms are what we today refer to as bacteria
Leeuwenhoek's skill in crafting lenses led to the creation of a microscope that was nearly as powerful as our modern light microscopes, enabling him to be the first person to observe human cells and bacteria. His work marked a significant leap in the field of microbiology, confirming the existence of microscopic life which was previously only speculated.
The earths core is made up of two parts-the inner and outer core. The inner core is made mostly of
The answer is (D) Solid Metal
A student places a beaker on a hot plate. To the beaker, he adds a clear liquid and a white powder. The mixture instantly begins to bubble. He concludes that a chemical reaction has occurred. Do you agree with his conclusion? Why or why not? Please explain.
Scientists are testing a new drug, which they think might allow people to memorize large amounts of information. Group A is taking a sugar pill. Group B is taking the new drug. Both groups are 25–35 years old and are not taking any other medicine. After a month, both groups will be given a memorization test, and scientists will compare each group’s ability to memorize new information. Which choice is the controlled variable (constant) in the experiment? A. the sugar pill B. the new drug C. the ability to memorize D. the age of the test subjects
Which of these are chemical changes in matter? Check all that apply.
Answer are B,D, and E
Which of the following elements has the largest atomic radius?
Potassium
Calcium
Cobalt
Nickel
Potassium has the largest atomic radius.
Explanation:Using periodic table trends one can easily compare the atomic radii of elements. The trends in atomic radii are as follow,
Trends in Groups:
Moving from top to bottom along the groups the atomic radii increases because as you move from top to bottom the number of shells increases hence, the distance of valence electrons from nucleus also increases and therefore, atomic radius increases.
Trends is Periods:
Moving from left to right along the periods the atomic radii decreases. This is because the number of protons and electrons increases but the the valence shell remain the same hence, causing more nuclear charge and more attraction between the valence electrons and nucleus.
Result:Potassium, Calcium, Cobalt and Nickle all are present in same period. Potassium present at the extreme left will have greater atomic radii of 0.227 nm while Co and Ni at the middle of period will have atomic radii of 0.125 nm each. While, the atomic radius of Calcium next to K is 0.197 nm.
Potassium has the largest atomic radius because the atomic radius generally increases as you move down on the periodic table, and Potassium is highest in the given options.
Explanation:The atomic radius generally increases as you move down a group in the periodic table because as you go down a group, an additional electron shell is added, increasing the distance between the nucleus and the outermost electron shell. Of the elements listed: Potassium, Calcium, Cobalt and Nickel, Potassium is highest in Group 1 (also known as Alkali metals), and thus it has the largest atomic radius.
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3.72 L/h to cubic centimeters per minute
what does the part of the equation to the left of the arrow represent in a chemical formula
PLEASE HELP FAST WILL MARK BRAINLIEST
Which element(s) is/are not balanced in this equation?
Pb(NO3)2 + 2KCl -> PbCl2 + KNO3
A.) K
B.) K, N, and O
C.) N amd O
D.) Pb, N, and O
(Even though you don't need the Periodic Table to figure this out, feel free to use it if you think it will help you)
in terms of newtons 3rd law of motion desribe this picture.
Newton's third law is: For every action, there is an equal and opposite reaction.
Newton's third law of motion declares that forces always come in action-reaction pairs; every action force has an equal and opposite reaction force. This principle explains the motion and equilibrium in every interaction between two objects, highlighting the intrinsic symmetry of forces in nature.
Explanation:Newton's third law of motion is a fundamental principle that provides insight into the interactions between two objects. The law states that for every action, or force, exerted by one object onto another, there is an equal and opposite reaction force. This means that whenever one body applies a force onto a second body, the first body will experience a force that is equal in magnitude but opposite in direction. This reciprocal action is what maintains the balance of forces in the universe.
For example, if you were to push against a wall, the wall pushes back against you with an equal force in the opposite direction. This is why you do not move the wall, and you feel the force of your own push being reflected back onto you. Another classic illustration is when two ice skaters push off against each other; both move in opposite directions due to the equal but opposing forces exerted.
In any interaction, no force exists alone; there are always action-reaction pairs. These forces are part of the same interaction and cannot be separated, reflecting a basic symmetry in nature. Newton's third law reveals the connectedness of forces and ensures that there is a constant state of motion or equilibrium in a system as long as external forces are balanced.
which of these describe radiation?
A: transfer of heat between two objects that are touching
B: transfer of heat by the actual movement of warmed matter
C: the process in which energy is emitted by one object transmitted through space and absorbed by another
D: the process in which energy is released by molecules breaking apart
which of these conduction?
A: transfer of heat between two objects that are touching
B: transfer of heat by the actual movement of warmed matter
c: the process in which energy is emitted by one object transmitted through space and absorbed another
D: the process in which energy is released by molecules breaking apart
which of these describes how heat transferred by conduction
A: air molecules touch the warm ground heating them up
B: warm air rises and takes heat with it eventually it cools and sinks
C: sunlight travels through space without the aid of fluids or solids
D: air at the equator rises and sinks at the poles
1. Radiation is the process in which energy is emitted by one object transmitted through space and absorbed by another.
2. Conduction is transfer of heat between two objects that are touching.
3. An example of conduction is when air molecules touch the warm ground, which heats them up. Therefore, For 1. option C, 2. option A, 3. option A is correct.
What is radiation ?The term radiation is defined as the energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field linked with it, and has wave-like properties.
Conduction is heat transportation between two objects that are touching each other. When two objects touch and one has a greater temperature than the other than heat is transferred to the object with the lower temperature.
A common example of conduction is the process of heating a pan on a stove. The heat from the burner convert directly to the surface of the pan.
Thus, For 1. option C, 2. option A, 3. option A is correct.
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The softest and hardest minerals are:
Rocks are made up of minerals. The hardest mineral is diamond. The softest mineral is talc, which is ground up to make talcum powder.
The excretory system _____.
- removes waste from the body
- pumps blood through the body
- helps the body move around
- protects internal organs
The excretory system removes waste from the body.
It includes several organs such as the kidneys, large intestine, liver, skin, and lungs. These organs work together to filter out harmful metabolic waste products and excess water from the blood, ensuring that waste does not build up to harmful levels and maintaining the body's homeostasis.
Functions of the Excretory System:
The kidneys filter blood to produce urine, removing waste and excess water.The lungs exhale carbon dioxide and water vapor.The skin eliminates waste through sweat, which contains water and electrolytes.The length of a copper wire is 1.6 centimeters (cm). What is the length of this wire in meters (m)?
Why are plastic building blocks good for building molecules
balance the equation: ch4 + 02 --> co2 + h2o
Answer:
CH4 + 2O2 → CO2 + 2H2O
ch4 +202-->co2+2h20
Steps in Balancing a Chemical Equation
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
Steps in Balancing a Chemical Equation
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
Many of Earth’s nonrenewable resources are very rare. Other nonrenewable resources, such as coal, are abundant but not easily replaced. What would happen if we used up all the coal on Earth?
Answer: There would be no more coal left to use.
Explanation:
nonrenewable resources are rare and not so easily to be replaced
Use chemistry in a sentence not love chemistry science chemistry
Answer:
Pollution in our environment is actually changing the chemistry of large bodies of water.
Explanation:
Pls mark brainliest.
Answer:Chemistry is the branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Explanation: verified answer
To which period does the Lanthanide series belong? Actinides?
The Lanthanide series belongs to the f-block of the periodic table, while the Actinide series belongs below the Lanthanide series in the f-block.
Explanation:The Lanthanide series belongs to the f-block of the periodic table and is located below the main body of the periodic table. It consists of the 15 elements from lanthanum (atomic number 57) to lutetium (atomic number 71). The Lanthanide series is also known as the rare earth elements.
The Actinide series, on the other hand, belongs to the f-block of the periodic table and is located below the Lanthanide series. It consists of the 15 elements from actinium (atomic number 89) to lawrencium (atomic number 103). The Actinide series is also known as the actinides.
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Why are both absolute dating and relative dating used to determine the age of fossils?
please help meeeeee brainly given!
Answer:
The one you chose is the correct answer! You can count on the other persons answer.
Explanation:
Also.... Im in CAVA too, 6th grade
Identify three factors that characterize aquatic systems.
Aquatic systems are characterized by abiotic factors, biodiversity, and water quality/chemistry. Each of these factors impacts the types of organisms that can survive in the environment and overall health of the system.
Explanation:Aquatic systems are characterized by three principal factors: abiotic factors, biodiversity, and water quality/chemistry.
Abiotic factors refer to the nonliving elements like sunlight, temperature, and salinity that directly affect the organisms living in these ecosystems. For example, in warmer temperatures, the water can hold less dissolved oxygen which can limit the types of species that can survive.
Biodiversity pertains to the variety of life forms present in the aquatic environment. It can range from microscopic organisms like phytoplankton to large mammals such as whales. The level of biodiversity often provides a measure of the health of the system.
Water quality/chemistry is extremely important in determining the types of organisms that can live in an aquatic habitat. Factors such as pH level, the amount of dissolved oxygen, nutrient content, and presence of pollutants all play an essential role.
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Complete the sentence. The higher the hydrogen ion concentration, the ______ the pH.
higher
lower
closer to 7
closer to 14
Answer: Higher the hydrogen ion concentration, lower will be the pH.
Solution:
The negative logarithm of hydrogen ion concentration in mol per litre of the solution.
pH= power of hydrogen ions
[tex]ph=-log[H^+]=log\frac{1}{[H^+]}[/tex]
As we can see from the formula ,if the concentration of hydrogen ion is inversely proportional to pH.
The higher the hydrogen ion concentration, the lower the pH. Therefore, option B is correct.
The pH scale is a measurement of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.
The pH of a solution is determined by the concentration of hydrogen ions (H+) present in the solution.
When the concentration of hydrogen ions increases, the solution becomes more acidic, and the pH value decreases. This is because hydrogen ions are responsible for the acidic properties of a solution.
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what does selectively permeable mean
Suppose you have 100 kg of fresh strawberries what would be the approximate mass of strawberries after you freeze dry them
The approximate mass of strawberries would be the same on freezing as according to the law of conservation of mass , mass can neither be created nor destroyed, it would only have change in density.
What is law of conservation of mass?
According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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Which of these peices off evidence did Alfred Wegners original theory of continental drift have access to?
reversing paleomagnetism in rocks on the ocean floor
a seafloor that was geologically active with earthquakes, volcanoes, and mountain chains
seafloor spreading at mid-ocean ridges
mountains in North America appearing to match up with mountains in Northern Europe
The answer is A seafloor that was geologically active with earthquakes, volcanoes, and mountain chains.
How many moles are in 79.85g Fe2O3?
Answer:
in 79.85 g of Fe2O3 there will be 0.5 moles of Fe2O3
Explanation:
To find the number of moles we must calculate the molecular weight of iron oxide, for that we use the periodic table:
mFe = 55.845 g/mol
mO = 15.999 g/mol
mFe2O3 = (2x55.845) + (3x15.999) = 159.687 g/mol
1 mole of iron oxide weighs 159.687 g, therefore, to calculate the number of moles present in 79.85 g it will be equal to:
nFe2O3 = 79.85/159.687 = 0.5 moles
Read the list of common household substances. Antacid, orange juice, toothpaste, yogurt Which of these substances are likely to have a sour taste? A.Antacid, yogurt B.Antacid, toothpaste C.Orange juice, yogurt D.Orange juice, toothpaste
Answer : The correct options is, (C) Orange juice, yogurt.
Explanation :
Acid : It is a substance that has ability of donating proton or hydrogen ion, [tex]H^+[/tex].
The properties of an acid are :
Acids are sour in taste.The texture of an acid solution is sticky.It changes the color of the litmus paper to red.It react with a metal to give compound and hydrogen gas.Base : It is a substance that has ability of donating hydroxide ion, [tex]OH^-[/tex].
The properties of an base are :
Base are bitter in taste.The texture of an base solution is slippery.It changes the color of the litmus paper to blue.It does not react with a metal.As we know that,
Antacid : It is a base that is used for the neutralization of stomach acidity. So, it is bitter in taste.
Orange juice : It is an acid in which citrus acid present in it. So, it is sour in taste.
Toothpaste : It is a base that is used for cleaning teeth. So, it is bitter in taste.
Yogurt : It is an acid in which lactic acid present in it. So, it is sour in taste.
Hence, the substance likely to have a sour taste are orange juice, yogurt.
Which graph shows negative acceleration? Graph A shows negative acceleration because the velocity is changing.
Graph A shows negative acceleration because the velocity is increasing.
Graph B shows negative acceleration because the velocity is decreasing.
Both graphs show negative acceleration.