Compounds may be represented by chemical formulas. In the chemical formula for water which is H20, the 2 which represents the number of hydrogen atoms is called_______?
A) the reactant.
B) the subscript.
C) the coefficient.
D) the atom factor.
how many elements in CuSO4
science question down below
calculate the percentage of a solution formed by dissolving 10g of glucose in 240g of water
what is the density of object with volume of 20 ml and a mass of 5 grams?
give the number of protons, electrons, and neutrons in the following atoms a. 90Zr b. 202Hg c. 58Ni d.222Rn
Answer:
are those numbers the atomic mass?
Explanation:
The number of protons, neutrons, and electrons for the atoms Zr, Hg, Ni, and Rn correspond to their atomic numbers and mass numbers, with Zr having 40 of each proton and electron and 50 neutrons, Hg with 80 of each proton and electron and 122 neutrons, Ni with 28 of each proton and electron and 30 neutrons, and Rn with 86 of each proton and electron and 136 neutrons.
To determine the number of protons, neutrons, and electrons in an atom, you need to know its atomic number (which is the same as the number of protons and electrons in a neutral atom) and its atomic mass number (which is the sum of protons and neutrons). Here's how to calculate them for each of the given isotopes:
Zirconium (Zr), with an atomic number of 40 (90Zr), has 40 protons, 40 electrons, and 50 neutrons (90-40).
Mercury (Hg), with an atomic number of 80 (202Hg), has 80 protons, 80 electrons, and 122 neutrons (202-80).
Nickel (Ni), with an atomic number of 28 (58Ni), has 28 protons, 28 electrons, and 30 neutrons (58-28).
Radon (Rn), with an atomic number of 86 (222Rn), has 86 protons, 86 electrons, and 136 neutrons (222-86).
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is it’s density?
The density of a substance is calculated by dividing its mass by its volume. For the aluminum block in question, its density is calculated by dividing its mass (40.5 g) by its volume (15.0 mL), yielding a density of 2.7 g/mL.
Explanation:The subject of this question is density, which is a property of matter defined as mass per unit volume. In this case, you have been given the mass of the aluminum block (40.5 g) and its volume (15.0 mL). To find the density, we simply divide the mass by the volume.
The formula we use is: Density = Mass/Volume.
Therefore the density of the block is 40.5 g divided by 15.0 mL, which results in a density of 2.7 g/mL. So, the density of the aluminum block is 2.7 g/mL.
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Josie bought a soda and 2 candy bars the soda cost $1.10 her bill was $2.40. how much was her candy bar?
what happens when an electron falls to a lower energy level?
When an electron falls to a lower energy level, a photon is emitted representing the energy difference between the higher and the lower state. This process is a fundamental aspect in atomic physics and basis of many light effects.
Explanation:When an electron falls to a lower energy level, energy is released. This energy transition is represented as an emitted photon, a packet of electromagnetic energy. Based on Bohr's model, a hydrogen atom is most stable in its ground state, when an electron is in its lowest energy orbit. An atom can absorb energy, causing an electron to shift to a higher energy level, or an excited state. However, an atom usually exists in the excited state for a brief period before the electron naturally transitions back to a lower energy level, or ground state. During this decline, a photon of specific wavelength is emitted, accounting for the energy difference between initial and final energy levels.
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Sodium has more valence electrons than magnesium. True or False
Which description is not a property of an acid? A turns litmus paper red B bitter taste C corrosive D dissolve metals
Answer:
Bitter Taste
Explanation:
Acids have a sour taste and Bases have a Bitter taste. Acids turn litmus paper red because their pH level is less than 7. They are corrosive and can break down materials. They can also dissolve metals. Hope this helped ú⩊ù
what organelle is found in paramecia cell but not plant cells
Which of the following techniques can be used to separate a homogeneous mixture into its component parts?
Sort by color
Sort by size
Separation by density
Use magnetism
The right is Separation by density .
Take the blood which is a good example of a heterogeneous mixture.
Blood is a vital liquid in our body, which transports oxygen from the air to our lungs so we can breathe. It is also used to eject wastes, such as carbon dioxide, to bring cells and molecules of the immune system to the tissues, and to spread hormones throughout the body. It corresponds to plasma, red blood cells, white blood cells, platelets and hemoglobins combined.
In medical tests centrifugal force is used to separate the different components of the blood.
In general, the centrifugation will allow to separate and analyze the different components of the blood, to know if the rate of white blood cells in the blood of a patient, for example, is normal, and therefore to know if his system Immune is integrity.
Under the action of centrifugal force, the solid components in the blood are drawn to the bottom of the tube in which the blood is contained. The centrifugal force then acts as an accelerated settling. It separates plasma from red blood cells and white blood cells.
Answer:
The answer is seperation by density! Hope this helped
Explanation:
Franklin ordered 6 boxes of popsicles for a pool party. each box had 20 popsicles. there will be 50 guests at the party. which can we use to find the number of popsicles (p) each person can have if they are divided equally between the guests
Answer:
ok so the answer is 6×12÷24= THE Answer if u were look for this
Explanation:
SO IN KHAN I DID IT AND I GOT IT RIGHT
THX PERSON
The sales tax rate is 8%. If Jim bought a new Buick and paid a sales tax of $1,920, what was the cost of the Buick before the tax?
Answer:
$24000
Explanation:
We are given that
Sales tax=8%
Sales tax amount=$1920
We have to find the cost of the Buick before the tax.
Let x be the cost of Buick before the tax.
According to question
8% of x=1920
[tex]\frac{8}{100}\times x=1920[/tex]
[tex]x=\frac{1920}\times \frac{100}{8}[/tex]
[tex]x=24000[/tex]
Hence, the cost of the Buick before the tax=$24000
In the following reaction, the sodium and chlorine are ____. 2NaCl->2Na + Cl^2
Answer : The sodium and chlorine are the products.
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on the reactant side must be equal to the product side.
The given balanced chemical reaction is,
[tex]2NaCl\rightarrow 2Na+Cl_2[/tex]
In the balanced chemical reaction, the species present on the left side of the reaction is known as reactant and the species present on the right side of the reaction is known as product.
From this we conclude that, the sodium, [tex]Na[/tex] and chlorine, [tex]Cl_2[/tex] are the products and sodium chloride, [tex]NaCl[/tex] is the reactant.
Hence, the sodium and chlorine are the products.
Why is it important to dispose of wastes from nuclear power plants carefully? A) The wastes cause the greenhouse effect. B) The wastes are radioactive and could cause cancer. C) The wastes do not decompose and take up a lot of space. D) The wastes flow into ponds and lakes and cause algal bloom.
Why do organisms need to maintain homeostasis
Organisms maintain homeostasis to ensure the optimal functioning of cellular processes, enabling them to adapt to various environmental conditions and maintain internal stability necessary for survival.
Explanation:Organisms need to maintain homeostasis to ensure that their cellular processes occur under optimal conditions. Through homeostasis, organisms maintain internal equilibrium by adjusting biological processes, despite external environmental changes. This is vital for survival, as it enables cells to function correctly and supports overall health and stability.
For example, thermoregulation is a form of homeostasis that helps organisms regulate their body temperature. Polar bears have adapted to cold climates with features like fur and blubber to conserve heat, while in hot climates, humans perspire and dogs pant to release excess body heat.
Furthermore, organisms use feedback mechanisms to regulate growth, reproduction, and to maintain a dynamic homeostasis. These mechanisms provide a way to respond and adjust to changes, ensuring that internal conditions remain within a narrow, favorable range.
a substance that has a definite shape and volume is a
A solid
B liquid
C gas
D fluid
Hydrocarbon with empirical formula c3h8
The hydrocarbon with the empirical formula C3H8 is Propane, a saturated hydrocarbon that belongs to the alkane family.
Explanation:The hydrocarbon with an empirical formula of C3H8 is Propane. The empirical formula provides the simplest, reduced ratio of elements within a compound. In the case of C3H8, this represents 3 carbon atoms to 8 hydrogen atoms, which is the formula for propane. Propane is a member of the alkane family of hydrocarbons, which are characterized by single bonds between the carbon and hydrogen atoms, therefore classified as saturated hydrocarbons.
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how many total atoms are in CuSO4
How high in meters must a column of glycerol be to exert a pressure equal to that of a 760-mm column of mercury? The density of glycerol is 1.26g/mL, whereas that of mercury is 13.6g/mL.
if I drop a watermelon from the top of one tower dorms at csu , and it takes 3.34 seconds to hit the ground , calculate how tall the building is in feet . 1 meter =3.2 ft
What is an astronomical unit? Why is this unit used to measure distances in the solar system?
Matt did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 50 g of Substance A in the beaker labeled A and 50 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Experimental ObservationsSubstance Mass of Undissolved Substance at Different Temperatures (gram)
20 °C 40 °C 60 °C 80 °C
A 50 50 50 50
B 10 8 5 2
Part 1: Which, if any, substance is soluble in water?
Part 2: Explain how the data helped you determine solubility for both substances for temperatures 20 °C to 80 °C.
Part 1 : Answer is only B substance is soluble in water.
In this experiment undissolved mass of each substance was measured. According to the given data, undissolved mass of substance B at 20 °C is 10 g while A is 50 g. Since, the initial added mass of each substance is 50 g, we can see that substance A is not soluble in water since the undissolved mass is 50 g.
Part 2 : Substance A is not soluble in water and substance B is soluble in water.
According to the given data, the undissolved mass of substance A remains as same as initial added mass, 50 g throughout the temperature range from 20 ° to 80 °C. Hence, we can conclude that substance A is not soluble in water.
But, according to the data, undissolved mass of substance B at 20 °C is 10 g. That means, 40 g of substance B was dissolved in water. When the temperature increases the undissolved mass of substance B decreases. Hence, we can conclude that substance B is soluble in water and solubility increases with temperature.
Is the following chemical equation balanced? 2Na + 2H2O 2NaOH + H2
yes because you have 2 H 2Na 2O on both sides
Answer : Yes, the given chemical reaction is balanced equation.
Explanation :
Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.
The given chemical reaction is,
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
In this reaction, there are 2 atoms of sodium, 4 atoms of hydrogen and 2 atoms of oxygen are present on both side of the reaction. So,
This chemical reaction is a balanced reaction because in this reaction, the number of atoms of sodium, hydrogen and oxygen are balanced on the side of the reaction.
Hence, yes the given chemical reaction is balanced equation.
Transport of glucose enters a liver cell through a protein Chanel
Which has more volume a kilogram of feathers or a kilogram of bricks please answer quickly thank you
What is the relationship between density and buoyancy of a fluid explain
Many fish can adjust the density of their bodies by controlling the amount of gas in a sack called a swim Blatter how what do you amount of gas in swimbladder have to change in order for the fish to swim deeper underwater explain your answer you guys please help me with these questions it is due tomorrow and I really need help
A sample has a mass of 15 g and a volume of 3 mL calculate the density
WHAT ARE NEWTON'S 3 LAW'S
Final answer:
Newton's three laws of motion are fundamental principles in classical mechanics, explaining how objects behave under various forces. The first law, or law of inertia, says objects maintain their state of motion unless acted upon by an external force. The second law relates force, mass, and acceleration, while the third law states that every action has an equal and opposite reaction.
Explanation:
Isaac Newton's three fundamental laws of motion form the basis for classical mechanics, describing the relationship between a body and the forces acting upon it. The laws are integral to our understanding of interactions and forces in physics.
Newton's first law, also known as the law of inertia, asserts that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an external force. Newton's second law advances this concept by stating that the acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass. Lastly, Newton's third law establishes that for every action, there is an equal and opposite reaction, meaning that forces between two interacting objects are equal in magnitude and opposite in direction.