A chemical reaction includes two or more reactants and the products separated by an arrow. The reactants are separated each other by a plus sign and the same in between the products.
What is a reaction?A chemical reaction is the combination of two or more reactants or reacting species. Through effective collision, they form products.
The reactants and products are separated each other by a right arrow. Let A and B the reactants and C be the product. Then, the reaction is written as below:
A + B [tex]\rightarrow[/tex] C.
Sometimes the reactions can be reversible where we can use a reversible arrow ' ⇄ ' which indicates that the products can in turn convert into the reactants.
Sometimes an equal sign is used to indicate the product side in a reaction but it is not scientific and an arrow is used more properly.
Therefore, the symbol used to separate reactants from each other r products from each other is a plus sign. Hence, D is correct.
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Final answer:
In a chemical equation, reactants are written on the left hand side and products on the right hand side. The arrow is used to indicate the direction of the reaction, and plus signs (+) separate individual reactant and product formulas.
Explanation:
A chemical equation uses symbols to describe a chemical reaction. In a chemical equation, reactants are written on the left hand side of the equation and the products on the right. The arrow is used to show the direction of the reaction. Plus signs (+) separate individual reactant and product formulas.
On Earth, the mass of one of the lunar landing modules used to explore the moon was measured to be about 4,200 kg. The acceleration due to gravity on the moon is about one-sixth that of Earth. What is the lunar landing module’s weight on Earth? N What is the mass of the lunar landing module on the moon? kg The weight of the lunar landing module on the moon is its weight on Earth. The calculated weight of the lunar landing module on the moon is N.
Answer:
41,160 is the first
4,200 is the second
less than is the third
6,860 is the last one
Explanation:
The weight of the Lunar Landing module on Earth is 41202 N
The mass of the lunar landing module on the moon is 4200 N
The weight of the lunar landing module on the moon is less than its weight on Earth.
The calculated weight in the moon is 6867 N
What is Lunar Landing Module?
A lunar landing module is a lunar landing designed to enable astronauts to travel via a spacecraft in a lunar orbit as well as the lunar surface.
From the given parameters:
mass of the lunar landing module on earth = 4200 kgacceleration on moon = 1/6th of earth's accelerationThe weight of the Lunar Landing module on Earth is:
Weight on Earth = mass (m) × acceleration due to gravity (g)
Weight on Earth = 4200 kg × 9.81 m/s²
Weight on Earth = 41202 N
The mass of the Lunar Landing module on the Moon is calculated by using the formula:
Weight on Moon = mass (m) × acceleration in the moon
Where;
acceleration on moon = 1/6 ×9.81 m/s² = 1.635 m/s²Since mass on earth = mass in the moon;
The mass of the lunar landing module on the moon is 4200 NThe weight of the lunar landing module on the moon is less than its weight on Earth.
The calculated weight in moon = 4200 × 1.635 m/s²
The weight in moon = 6867 N
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Give the number of significant figures: 0.011 cm
Significant figures:
Answer:
Significant figures: 2
Explanation:
There are 2 significant figures since the zeros at the left side don’t count and the number can be expressed in its scientific notation as 11x10-3 cm
Which factor causes a decrease in the rate of dissolution?
Answer: Size of Solute and Surface area
Explanation: Rate of dissolution is the speed at which the given solute gets dissolved in the given solvent.
Now this rate of dissolution depends on may factors like-
a) Size of Solute - If the solute size is bigger then it will take much more time to get dissolved. Thus smaller size solute are easily dissolved in the solvent.
b) Surface area - If the surface area of the solvent is larger, then the collision between the solute and solvent will be much higher and thus rate of dissolution will increase.
Thus decreasing the surface area of solute will lead to decrease in the rate of dissolution.
Why is it hard to prove the law when a gas is produced?
Chemical reactions occur when the starting materials called the reactants rearrange their electrons to create new bonds. It is very difficult to prove the law of conservation of mass in the case of gases.
What is law of conservation of mass?According to the law of conservation of mass, mass can neither be created nor be destroyed. It can be converted from one form to another. The law of conservation of mass says that the mass of reactants must be equal to the mass of products.
The gas molecules move quickly into the outside space and away from the system. When a gas is produced, it quickly diffuses away from the site of synthesis making it difficult to measure the mass of the products.
So the law of conservation of mass cannot be proved in the case of gases. Randomness is found to very high in gas molecules, so that the measurement of mass is difficult and could not be accurate.
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why is the principle about the relationship between mass volume always true of substances , but not always true for mixtures
For pure substances, the mass and volume will always be the same or will always change the same way because all substance are the same throughout.
While for mixtures, you can have varying amount of each component therefore mass and volume will not change the same way for substances.
explain how the nettle is adapted for defence and protection
Answer:
In biology, adaptation has three related meanings. The definition that relates most to this question is given below:
Adaptation is the dynamic evolutionary process that fits organisms to their environment, enhancing their evolutionary fitness.
A Nettle plant also known as common nettle, stinging nettle nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae with the ability to sting.
Explanation:
One of the biological traits that the nettle has is its ability to produce inflammatory effect (that is a burning stinging sensation on the skin known as "contact urticaria"). This unpleasant effect is achieved by impaling the skin of the animal via spicules. The spicules cause mechanical irritation.
The stinging effect is also achieved by the introduction of biochemical irritants such as histamine, serotonin and choline among other chemicals into the skin.
This sort of defence or protection mechanisam keeps animals away from the nettle.
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the fuel tank of an automobile has a capacity of 14.8 gallons. if the density of gasoline is 42.0 lb/ft^3, what us the mass of fuel in kilograms when the tank is full?
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What is the difference between a terrestrial planet and a gas giant
Gas Giants are usually bigger than Terrestrial Planets. Gas Giants also have thicker atmospheres, and have gaseous surfaces. Terrestrial planet tend to be smaller, and have solid surfaces. In our solar system, Mercury, Venus, Earth (home), and Mars are Terrestrial planets. While Jupiter, Saturn, Uranus (the planet), and Neptune are Gas Giants. Gas Giants are also known as Jovian planets.
Which of the following is a unit of volume in the English system of measurement? A. Meters B. Gallons C.liters per cubic gram D. Kilograms per cubic centimeter
Answer : The correct option is, (B) Gallons
Explanation :
English system : It is defined as the measurement system that is used in many countries including the United States.
The English system measured the things in feet, inches and mile for length, ounce, ton, pint and gallons for volume.
As per question, we conclude that the unit of volume in the English system of measurement is gallons.
Hence, the correct option is (B) Gallons
A block has sides that are 2cm long, 3 cm wide, and 2cm high. What is the volume ?
what is the density of a cube that has a mass of 25 grams and a volume of 125cm
The density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.
What is density?
The density of the material is defined as the mass of the substance per unit volume or it is the ratio of mass of the substance to the volume of the substance and the unit will be centimeter cube.
To calculate density the given formula is mass of material to the volume of material.
density = mass / volume
mass = 25 grams
volume = 125 cm
Substituting the value in the formula,
density = 25 / 125
= 0.2 centimeter cube.
Therefore, density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.
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Always report their observations and results truthfully
How might a hurricane in Florida cause anomalous nest data
science question below fast answer please
Different material do not form compounds in mixtures. True or false
what do you think he will found out when he swings the pendulum for 15 seconds
For the following experiment, write a possible hypothesis, and then identify the independent variable, dependent variable, and controlled variables. Susan wants to find the fastest route to drive to youth group. She can take the freeway, arterials, or residential roads on her way to youth group.
We discussed the importance of having only one independent variable, but trying to test more than one independent variable is an error many people make. In the following experiment, identify the errors that the experimenter made and summarize a valid way to test his research question: What cooking spray best keeps food from sticking to a pan? In the morning, Dan uses grapeseed oil to cook eggs for breakfast; for lunch, he uses vegetable oil spray to coat a muffin tray and cooks cornbread to eat with his chili; for dinner, he uses olive oil to pan cook a hamburger patty.
Design a simple experiment that you could conduct at home. What is your hypothesis? What are the independent, dependent, and…
What is a boundary between geologic units?
geologic map
geologic unit
contact
fault line
list the major points in daltons atomic theory
Dalton's atomic theory proposed that elements are made of atoms, which are indivisible and have specific mass and properties for each element. His theory also stated that atoms combine in fixed ratios to form compounds and cannot be created or destroyed in chemical reactions. Modifications have been made to this theory, as atoms can be divided and isotopes and nuclear reactions exist.
Dalton's Atomic Theory
John Dalton's atomic theory was a groundbreaking attempt to explain the nature and behavior of atoms. The main points of Dalton's atomic theory include:
Elements are composed of extremely small particles called atoms.
Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in these properties.
Atoms cannot be subdivided, created, or destroyed in chemical reactions.
Atoms of different elements can combine in whole number ratios to form chemical compounds.
In chemical reactions, atoms are rearranged, combined, or separated.
Despite its success, modifications to Dalton's atomic theory have been made. We now know that atoms can be divided into subatomic particles (electrons, protons, and neutrons), isotopes of elements can have different masses, and atoms can be transformed via nuclear reactions.
desides the hurricane force winds and roads filling with snow, what other hazards do you think the blizzard caused?
Blizzards pose hazards beyond hurricane-force winds and snow-filled roads, including infrastructure failures leading to fatalities, potential health issues like respiratory ailments, injuries due to hazardous conditions, and significant economic impacts.
Explanation:Beyond the direct impact of hurricane-force winds and snow-filled roads, blizzards can cause various other hazards that affect both people and the environment. Critical infrastructure can fail, as seen in the south Texas freeze, where electrical capacity faltered leading to widespread blackouts. The lack of power in freezing temperatures can lead to fatalities and other severe consequences, including the inability to heat homes, frozen and burst water pipes, and the loss or contamination of the water supply.
Another major hazard caused by blizzards is the health impact on individuals. This includes conditions like 'dust pneumonia,' especially among those vulnerable such as children and the elderly, due to prolonged exposure to dust and soot inhalation. In addition, extreme weather conditions can lead to a higher incidence of injuries and exacerbate chronic health conditions, including respiratory diseases. Moreover, the economic damage from such a storm can be immense, disrupting local economies and livelihoods long after the storm has passed.
A sample of a substance that has a density of 0.824 g/mL has a mass of 0.451g. Calculate the volume of the sample.
The volume of the substance can be calculated by dividing the given mass (0.451g) by the density (0.824 g/mL). Therefore, the volume equals approximately 0.547 mL.
Explanation:The subject of this question is the calculation of volume using the given mass and density of a substance. The density is defined as mass per unit volume. Thus, you can calculate volume by dividing the mass by the density.
For this specific question, the given mass of the substance is 0.451g and the density is 0.824 g/mL. To calculate volume, divide the mass by the density. So, Volume = mass/density = 0.451g / 0.824 g/mL = 0.547 mL.
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What is the formula for germicide that is sufficient to kill blood-borne pathogens?
Starting with the unbalanced equation for the combustion of ethanol,
C2H5OH(l)+O2(g)→CO2(g)+?H2O(l)
what coefficient should be placed in front of H2O to balance the hydrogen atoms
Final answer:
The coefficient that should be placed in front of H2O to balance the hydrogen atoms for the combustion of ethanol is 3. After balancing the hydrogen atoms, the fully balanced chemical equation for the combustion of ethanol is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).
Explanation:
To balance the hydrogen atoms in the combustion of ethanol, we start with the unbalanced equation C2H5OH(l) + O2(g) → CO2(g) + H2O(l). Ethanol (C2H5OH) contains 6 hydrogen atoms, and since each molecule of water (H2O) contains 2 hydrogen atoms, we need 3 molecules of water to account for all the hydrogen atoms from ethanol. Therefore, the coefficient for H2O in the balanced equation is 3.
After placing 3 in front of H2O, the equation looks like this: C2H5OH(l) + O2(g) → 2CO2(g) + 3H2O(l), which balances the hydrogen atoms. To complete the balancing, the oxygen atoms also need to be accounted for. In the product side, there are a total of 7 oxygen atoms (4 from the 2CO2 and 3 from the 3H2O). There is 1 oxygen atom in the ethanol molecule, so we need 6 more oxygen atoms from O2, which means we need 3 O2 molecules. Thus, the coefficient for O2 is 3. The fully balanced equation is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).
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What advantage do computers give scientist as tools for investigations?
Visible light represents a very small portion of the electromagnetic spectrum. Radiation to the left in the image, such as microwaves, has a longer wavelength than visible light. Radiation to the right has a shorter wavelength than is observable. Which radiation has a higher frequency than visible light?
x- ray is the answer, believe old dude if you want to.. I just had this question on USA Test Prep
Answer: It is xrays
Explanation: because i got it right just trust me
During an investigation a scientist heated 27 g of mercuric oxide till it decomposed to leave a dry product. The total mass of the product formed was 25 g. Does the law of conservation of mass hold true in this case?
Answer:
Yes.Explanation:
The law of conservation of mass holds true, because the mass missing is in gas form. The fact that matter can change, doesn't mean they violate this law of conservation.
So, this law is always happening.How many atoms are equal to 1.5 moles of helium
One mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present. 1.5 moles of Helium, there are [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.
Mole Concept:
In one mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present.
This number is as many as Carbon atoms present in 12g of Carbon 12. [tex]6.02 \times10^2^3[/tex] is also known as Avogadro's constant.As we know 1 mole = [tex]6.02 \times10^2^3[/tex]
hence,
1.5 moles of Helium = [tex]1.5 \times 6.02 \times10^2^3 = \bold{9.03 \times 10^2^3}[/tex]
Therefore we can conclude that in 1.5 moles of helium, there are [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.
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