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.
Sulfur has fewer valence electrons than chlorine. True or False
Answer:
True
Explanation:
Valence electron:
No. of electrons present in the outermost shell of any atom is called valence electrons. Valence electrons determines the chemical properties of element.
Atomic no. of S = 16
Electronic configuration of S = [tex]1s^22s^22p^63s^23p^4[/tex]
Energy shell (n = 3) is the outermost shell
Valence electrons = 6
Atomic no. of Cl = 17
Electronic configuration of S = [tex]1s^22s^22p^63s^23p^5[/tex]
Energy shell (n = 3) is the outermost shell
Valence electrons = 7
So, sulfur has 6 valence electrons and Cl has 7 valence electrons.
The statement 'Sulfur has fewer valence electrons than chlorine.' is true.
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.
ANSWER ASAP WILL BE GIVING MEDAL HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! On cold winter nights a mother places a portable heater in her toddler's bedroom. the heater does not have a fan to blow hot air, it only has simple metal coils that get very hot. A) Convection B) Conduction C) Radiation D) Induction
On cold winter nights, a mother places a portable heater in her toddler's bedroom. The heater does not have a fan to blow hot air, it only has simple metal coils that get very hot. Therefore, option C is correct.
What is metal coil ?Metal coil is created by winding or coiling a finished steel product, such as a sheet or strip, after it has been rolled. The width of the steel coil is substantially greater than the thickness. Steel coils can be categorized as Hot Rolled, Cold Rolled, or Galvanized, depending on the production process.
Depending on the industry, different uses for steel coil can be found, but some of the more common and well-known ones are pipe manufacture, structural steel components, electronic components, consumer goods, automobile parts, and many more.
In the ignition system of a vehicle, the metal coil is an induction coil that converts the battery's voltage to the thousands of volts required to produce an electric spark in the spark plugs that ignites the fuel.
Thus, option C is correct.
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what is sinking cold air and rising warm air?
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.
what does the part of the equation to the left of the arrow represent in a chemical formula
Which of the following muscles can you control?
biceps
quadriceps
deltoid
all of the above
Answer:
All of the above i think sorry if im wrong
Explanation:
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
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
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.How many oxygen atoms are in the product H2CO3 H2O+CO2
The products H₂O and CO₂ from the decomposition of H₂CO₃ contain a total of 3 oxygen atoms, with one from the water and two from the carbon dioxide.
The question How many oxygen atoms are in the product H₂CO₃ H₂O+CO₂is a chemistry problem that involves counting the number of oxygen atoms in the products of a chemical reaction. The compound H₂CO₃ decomposes into H₂O (water) and CO₂ (carbon dioxide). To determine the number of oxygen atoms, we look at the products H₂O and CO₂. Water has one oxygen atom, and carbon dioxide has two oxygen atoms. Therefore, each molecule of H₂O has one oxygen, and each molecule of CO₂ has two oxygens.
We sum the number of oxygen atoms from both products: 1 oxygen from H₂O and 2 oxygens from CO₂, giving us a total of 3 oxygen atoms in the products of the reaction.
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.
which structures function mainly in transport
C and D structures function mainly in transport. Hence, option D is correct.
What structures function in active transport?The membrane structures that function in active transport eg. integral proteins.
A major role of the plasma membrane is transporting substances into and out of the cell.
The plasma membrane is selectively permeable, allowing only certain substances to pass through.
Proteins embedded within the plasma membrane helps to move hydrophilic, polar molecules into the cell.
Hence, option D is correct.
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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
3.72 L/h to cubic centimeters per minute
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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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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Complete the sentence electrical conductivity of a sample will _____ when the size of the sample increases
The most appropriate word to complete the sentence is: stay the same.
The complete sentence is then written as: "The electrical conductivity of a sample will stay the same when the size of the sample increases."
Conduction refers to the transfer of thermal energy or electric charge as a result of the movement of particles through a conductor such as a metal.
Generally, when conduction relates to electric charge (current), it is referred to as electrical conduction.
Hence, electrical conductivity is a measure of the ability of a material or metal to conduct electricity by allowing the flow of electrons and current.
In Science, there are three (3) main factors that affect the electrical conductivity of a material and these include;
Temperature.Type of electrolytes (ions).Concentration of ions.However, the size of a material does not affect its ability to conduct electricity.
In conclusion, the electrical conductivity of a sample will stay the same when the size of the sample increases.
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Describe two ways that carbon can get from seashells to the atmosphere
Answer: Two different ways carbon can get from shells to the environment is through limestone, lithosphere, spring of gushing lava, + barometrical CO2. The subsequent method to arrive would be through the maritime CO2, marine creatures + plants, silt, flammable gas, power plants, and afterward environmental CO2.
Explanation:
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.
Select the correct chronological order for the discoveries by the following scientists
a)Thompson. Dalton. Rutherford, Bohr
b)Dalton, Thompson, Rutherford, Bohr
c)Bohr, Rutherford, Dalton, Thompson
d)Rutherford, Dalton, Thompson, Bohr
The correct chronological order for the discoveries by the scientists are Dalton, Thompson, Rutherford, Bohr. Therefore, option B is correct.
What are discoveries ?The act of discovering something, whether it be data, a location, or an item, particularly when doing so for the first time: the discovery of electricity.
Leonardo was a prolific scientist. a travel or exploration voyage. An investigation into a murder was opened when a corpse was found in the brush.
While Discovery aids in identifying the adjustments and enhancements that are required, it also aids in streamlining and ranking those changes, helping you choose which requests are most crucial and how to accommodate everyone's requirements.
In order to make a discovery, one must present observational data and make an effort to form a preliminary knowledge of a phenomenon.
Thus, option B is correct.
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Which of these are chemical changes in matter? Check all that apply.
Answer are B,D, and E
how does the sun cause wind
Waters states of matter include steam liquid water and ice. What about water is the same in the states? What can you conclude about what changes and what does not change during a change of state?
Water's composition remains as H2O across all states—solid (ice), liquid (water), and gas (steam)—while the arrangement and kinetic energy of the molecules change, affecting the density and physical properties of water.
Explanation:Understanding Water's States of Matter
Water can exist in solid, liquid, and gas states; namely ice, liquid water, and steam, respectively. The composition of water does not change across these states; it is always H2O, with two hydrogen atoms bonded to one oxygen atom. However, what changes during a change of state is primarily the amount of kinetic energy of the water molecules, which affects their movement and arrangement.
As water moves from solid to liquid, the molecules gain kinetic energy and start to move more freely, allowing the water to take the shape of its container. As a liquid transforms into a gas, the molecules gain even more kinetic energy, move faster, overcome attractive forces, and spread out to fill the entire volume of the container. The changes in states of matter are physical changes and do not affect the chemical makeup of water molecules.
The density of water also changes with the state it is in. The density is highest in the liquid state and decreases when water is in the form of its solid state, ice. This is due to the molecular arrangement in ice that creates a crystalline structure with more space between the molecules. Conversely, water vapor has the least density as the molecules are spread out the most.
Use the term chloroplast and organelle in a sentence
what does selectively permeable mean
What is the solid, rocky outer layer of the mantle?
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
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.