Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
A) kg is your answer
"Mass" is weight without gravity, and so the SI unit would also use the weight measurement. (You solve by dividing the force of gravity from the total weight to get mass.)
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You can be electrocuted if you try to use water to put out a class_ fire ?
The air,soil,and most foods and beverages are example of?
Molecules or atoms. One of those. although atoms make up everything so i would go with atoms.
Answer:
Mixtures
Explanation:
The air,soil,and most foods and beverages are example of Mixtures. Mixtures are a combination of two or more substances into a single substance. Air is a mixture of gases, soil is mixture of elements, most foods are also mixtures.
The mixture can be both homogeneous or heterogeneous. A homogeneous mixture has a uniform appearance throughout and uniform composition as well. Whereas, a heterogeneous mixture neither has uniform composition nor it has uniform appearance.
Please Help!
Complete and balance the following equation: Cd(NO3)2 + NH4Cl
((Include explanation please! I cant find how to do it and I need the explanation...))
CdCl2+2NH4NO3
It is substitution reaction
Cd is metal with 2+ which connect with Cl(-)
NO3 with NH4 form salt
Answer:
Cd(NO₃)₂ + 2NH₄Cl → CdCl₂ + 2NH₄NO₃
Explanation:
The reaction given is a double replacement reaction, which means that the reactants will dissociate and the ions will be changed between them. So, let's identify the ions.
At Cd(NO₃)₂, the metal Cd has cation Cd⁺², and the anion is NO₃⁻ (the number of ions is changed and the cation is the first to appear in the formula). At NH₄Cl, the cation is NH₄⁺ and the anion is Cl⁻, so the products are CdCl₂ and NH₄NO₃ (the cation comes first, and the charges are replaced between them).
So, the reacion will be:
Cd(NO₃)₂ + NH₄Cl → CdCl₂ + NH₄NO₃
To balance the equation, all the elements must have the same number on both sides, thus we need to multiply NH₄Cl and NH₄NO₃ by 2:
Cd(NO₃)₂ + 2NH₄Cl → CdCl₂ + 2NH₄NO₃
Which sub shell is likely to be filled after the rest of the sub shells at a particular energy level? 1. p
2. f
3.d
4.s
The subshell thats likely to be filled is s subshell
after the rest of the subshells at a particular energy level.
1. p
2. f
3.d
4.s
Answer:
2.f
Explanation:
At a particular energy level, say energy level 4. So lets compare subshells within the particular shell or energy level. Comparing 4s, 4p, 4d and 4f. Subshell s has the lowest energy and subshell f has the highest energy. So 4s orbital will be filled first, followed by 4p, 4d and 4f. This is in accrdance to Aufbau principle.
Therefore the f subshell is likely to be filled after the rest of the sub shells at a particular energy level are filled.
Which statement is true about the elements present in a pure substance?
A They maintain their chemical properties.
B They are composed of many compounds.
C They can be separated by physical methods.
D They can only be separated by chemical methods.
Answer: Option (D) is the correct answer.
Explanation:
An element is defined as a substance that contains atoms of one type.
For example, a piece of sodium metal will contain only atoms of sodium.
Therefore, it is a pure substance. Whereas a compound is a substance that consists of two or more different atoms in similar composition.
For example, [tex]CaCl_{2}[/tex] is a compound.
When elements change into compounds then they tend to change their chemical properties.
Hence, we can conclude that the statement they can only be separated by chemical methods, is true about the elements present in a pure substance.
What determines the average kinetic energy of the particles in a gas? A. the number of collisions B. the number of particles C. the size of the particles D. the temperature
Answer:
The correct answer is
D. the temperature
Explanation:
According to the forces of attraction,the average kinetic energy of the particles in a gas is determined by the temperature.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
As the forces of attraction are least in gases they have maximum average kinetic energy which is further increased by an increase in temperature.
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Which of the following molecules experience dipole-dipole forces as its strongest IMF? A) H2 B) SO2 C) NH3 D) CF4 E) BCl3
Answer: [tex]NH_3[/tex]
Explanation:
a) [tex]H_2[/tex]: This is a non polar covalent compound which are held by weak vanderwaal forces of attraction.
b) [tex]SO_2[/tex]: This is a covalent compound which is polar due to the presence of lone pair of electrons and are held by dipole-dipole forces of attraction.
c) [tex]NH_3[/tex]: These are joined by a special type of dipole dipole attraction called as hydrogen bond. It forms between electronegative nitrogen atom and hydrogen atom and is the strongest interaction.
d) [tex]CF_4[/tex]: This is a covalent compound and is non polar which are held by weak vanderwaal forces of attraction.
e) [tex]BCl_3[/tex]: This is a covalent compound and is non polar which are held by weak vander waal forces of attraction.
NH3 (Ammonia) experiences dipole-dipole forces as its strongest IMF due to its polar nature and the uneven distribution of electron density within the molecule.
Explanation:The student's question asks to identify which molecule experiences dipole-dipole forces as its strongest intermolecular force (IMF). Dipole-dipole forces occur in polar molecules where there is an uneven distribution of electron density that creates dipoles, meaning one end of the molecule is slightly positive while the other end is slightly negative. Given the list of molecules, NH3 (Ammonia) experiences dipole-dipole forces as its strongest IMF because it is a polar molecule with a trigonal pyramidal structure, leading to a net dipole moment. Ammonia has a nitrogen atom with a lone pair that causes the molecule to be asymmetrical and polar, resulting in dipole-dipole attraction between molecules.
There are 0.3 moles of xenon gas in a 0.5-liter container at 30 degrees C. What is the pressure exerted by the xenon gas
Answer : The pressure of the gas is, 14.925 atm
Solution :
using ideal gas equation,
[tex]PV=nRT[/tex]
where,
n = number of moles of gas = 0.3 mole
P = pressure of the gas = ?
T = temperature of the gas = [tex]30^oC=273+30=303K[/tex]
R = gas constant = 0.0821 Latm/moleK
V = volume of the gas = 0.5 L
Now put all the given values in the above equation, we get the pressure of the gas.
[tex]P\times (0.5L)=(0.3mole)\times (0.0821L.atm/mole.K)\times (303K)[/tex]
[tex]P=14.925atm[/tex]
Therefore, the pressure of the gas is, 14.925 atm
Which sentence best describes part of the process for generating electricity in a nuclear power plant?
A. Atoms join together to produce water molecules.
B. An atom releases electrons, producing an electric current.
C. Protons and neutrons join together to create atoms.
D. Heat is released when atomic nuclei split.
Answer is: D. Heat is released when atomic nuclei split.
Nuclear fission is a nuclear reaction or a radioactive decay where nucleus of atom split into smaller ligher nuclei.
Nuclear fission is exothermic reaction which release large amounts of energy (electromagnetic radiation or as kinetic energy, which heat reactors where fission reaction take place).
Nuclear energy is the energy found in the nucleus of an atom.
Answer is: D. Heat is released when atomic nuclei split.
Nuclear fission is a nuclear reaction or a radioactive decay where nucleus of atom split into smaller ligher nuclei.
Nuclear fission is exothermic reaction which release large amounts of energy (electromagnetic radiation or as kinetic energy, which heat reactors where fission reaction take place).
Nuclear energy is the energy found in the nucleus of an atom.
which actions would increase the rate at salt dissolves in water
□ stir the water
□ crush the salt
□ use less water
□ heat the water
□cool the salt
Answer : The correct options are, stir the water, crush the salt and heat the water.
Explanation :
As we know that the increase or decrease of the rate depends on many factors which are, temperature, surface area, etc.
Stir the water : By this action the rate increases because when we are stirring the water, the some amount of energy is released that means the temperature of the solution increases. Thus the salt dissolves easily in water by stirring.
Crush the salt : By this action the rate increases because the surface area of solute (salt) increased by the crushing. So, the salt will be dissolved easily in water.
Heat the water : By this action the rate increases because when we are heating the water the temperature of the water increases. As the temperature increases, some empty voids created in the water molecule. Thus, the more salt will be dissolved in water.
But by the use of less water and cool the salt action, the rate decreases.
Hence, the correct options are, stir the water, crush the salt and heat the water.
Answer: The answer is B: Crush The Salt.
Based on your answer in part B, arrange the five elements in order of their reactivity. Drag the most reactive element to the top and the least reactive element to the bottom. Tiles magnesium iron copper zinc hydrogen
Answer: Order of the elements from most reactive to least reactive is:
Mg > Zn > Fe > H > Cu
Explanation: Reactivity of the elements is the tendency of the elements to loose or gain electrons with ease.
As, all the given elements are metals, so the metals which will loose electrons easily will be more reactive. To study the reactivity of metals, we use reactivity series.
The metals which are more reactive are placed on the top of the reactivity series and which are less reactive are placed at the bottom.
Hence, the order of the elements from most reactive to least reactive is:
Mg > Zn > Fe > H > Cu
Reactivity series is attached below.
Answer:
magnesium
Zinc
Iron
hydrogen
copper
Explanation:
Just took the course activity
A solid is cooled to a very low temperature. Assuming the mass remains constant, how, if at all, does this affect the density of the solid?
Enter your answer in the space provided
it is making a new form so the density would be the same because water becoming into ice a solid are the same thing.
when a solid is cooled, its molecules slow down n vibrate less. usually its volume will decrease. as the mass remains constant and density = mass/volume, density will decrease.
can an excited lithium atom give off photos of light?
Yes or no
YYYEAAA
100% bro
Hope that help
Which MOST closely defines population density?
A. the number of organisms of a species per unit area
B. it determines how many organisms can survive in a given population
C. the number of organisms in a population that an ecosystem can sustain
D. it consists of all organisms of a species living together in a given area at given time
your answer should be
A. the number of organisms of a species per unit area
Brainliest?
Answer: Option (A) is the correct answer.
Explanation:
Usually, density is defined as mass present in per unit volume.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
Since density is directly proportional to mass so, more is the mass of an object more will be its density.
Similarly, population in terms of density is the number of organisms of a species per unit area.
Thus, we can conclude that out of the given options the number of organisms of a species per unit area MOST closely defines population density.
Which of these actions would decrease heat transfer between two objects?
increasing the temperature of the warmer object
increasing the area of their contact
reducing the thermal energy of the cooler object
reducing the time of their contact
Answer: Reducing the time of contact between the two objects will decrease the heat transfer between them.
Explanation:
increasing the temperature of the warmer object will raise its own temperature and hence the heat transfer will increase.increasing the area of contact will also increase the heat transfer because the rate of transfer will increase and the loss to surrounding will decrease.reducing the thermal energy of the cooler object will decrease its own temperature and this will increase the heat transfer to reach the equilibrium temperature.reducing the time of contact between the two objects will decrease the amount of heat transferred between the two objects according to the time that will be in contact.the answer is d you guys and girls i just took it on the test
balance 2Mg +O2 = 2MgO
The chemical equation [tex]2Mg + O_{2} = 2MgO[/tex] reflects the principle of conservation of mass, showing an equal number of atoms for each element on both sides of the equation, thus balancing it.
Explanation:The balance of the chemical equation [tex]2Mg + O_{2} = 2MgO[/tex] shows the principle of conservation of mass in chemistry. This principle states that the quantity of matter does not change in a chemical reaction.
Here, we have 2 atoms of magnesium (Mg) reacting with 1 molecule of oxygen ([tex]O_{2}[/tex]) to form 2 molecules of magnesium oxide (MgO). If you count the number of atoms of each element on both sides of the equation, you can see the balance: 2 magnesium atoms and 2 oxygen atoms on both sides.
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The given equation 2Mg + O₂ = 2MgO is already balanced, as there are equal number of each type of atom on the reactants and the product side.
Explanation:To balance the chemical equation 2Mg + O₂ = 2MgO, we need to ensure that the number of molecules or atoms for each element on the reactant side (left) is the same as on the product side (right). This is in accordance with the Law of Conservation of Mass which states that matter cannot be created or destroyed. In this particular equation, we have 2 molecules of Magnesium (Mg) and one molecule of Oxygen (O₂) combining to give 2 molecules of Magnesium Oxide (MgO). If we inspect the equation, we'll see it's already balanced because the number of Mg and O atoms are same on both sides.
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How does fluorine's electronegativity compare to the electronegativity of oxygen and chlorine?
The electronegativity of fluorine compare to the electronegativity of oxygen and chlorine as below
Fluorine has the highest electronegativity than oxygen and chlorine.
Explanation
Generally the electronegativity increase across the period ( from the left to the right) and decreases down the group.
Both oxygen and fluorine are in period 2 in periodic table. since fluorine is on fur right side as compared to oxygen , fluorine has higher electronegativity than oxygen.Answer:
Fluorine is a smaller atom so when it forms a covalent bond, the shared electrons are closer to the nucleus and there is less shielding, electronegativity of oxygen is greater.
Can someone please define the Cohesion of water?
cohesion is the "stickiness" that water molecules have for each other and for other substances.
Hope this helped :)
describe what water does to pavement when it continually freezes and thaws
Before it was launched, a helium-filled balloon had a pressure of 201 kPa at a temperature of 27°C. At an altitude of 15,000 m, the pressure had decreased to 2.5 kPa and the temperature had dropped to -14 °C. The volume of the balloon increased to 59.3 m3. What is the original volume of the balloon? please help
The original volume of the balloon is approximately 29 L.
Explanation:To calculate the original volume of the helium-filled balloon, we can use the combined gas law equation: PV/T = PV/T. Let's assume the unknown original volume as V1. Conversion of the temperatures from Celsius to Kelvin gives us T1 = 27 + 273 = 300K and T2 = -14 + 273 = 259K. Plugging the given values into the equation, we have (201 kPa)(59.3 m3)/300K = (2.5 kPa)(V1)/259K. Solving for V1, we find the original volume of the balloon to be approximately 0.029 m3 or 29 L.
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To solve for the original volume of the balloon, we can use the Ideal Gas Law. After converting the temperatures to Kelvin, we can rearrange the formula of the Ideal Gas Law to solve for the original volume. Doing this, we find that the original volume is approximately 1.73 cubic meters.
Explanation:To solve this physics question, we need to use the Ideal Gas Law that states PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. In this case, we assume that the number of moles doesn’t change and the R is a constant. Therefore, we can simplify the law to the formula P1V1/T1=P2V2/T2 to find the original volume of the balloon.
Firstly, you need to convert the temperatures from Celsius to Kelvin by adding 273.15. That gives us 300.15K for 27°C and 259.15K for -14°C. The initial pressure (P1) is 201 kPa, the final pressure (P2) is 2.5 kPa, and the final volume (V2) is 59.3 m3.
So applying the equation P1V1/T1 = P2V2/T2, we can solve for V1, the original volume:
V1 = (P2*V2*T1)/(P1*T2) = (2.5 kPa*59.3 m3*300.15K)/(201kPa*259.15K)
This gives us the original volume as V1 = 1.73 m3.
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As you move down group one of the periodic table, what happens to the atomic radii? They increase, because of the higher number of occupied energy levels. They increase, because of the stronger attraction between electrons and the nucleus. They decrease, because of the weaker effective nuclear charge. They decrease, because of the lower number of protons.
The correct answer is the atomic radius increase because of the higher number of occupied energy levels.
Atomic radius increases when going down a group. The valence electrons hold the higher levels because of the enhancing quantum number (n). As a consequence, the valence electrons get further away from the nucleus with the increase in n. The electron shielding inhibits these outer electrons from getting fascinated towards the nucleus. Therefore, they are held, and the resulting atomic radius is greater.
Answer:
they increase, because of the higher number of occupied energy levels
Explanation:
A mixture is made up of evenly spaced atoms of copper and silver. Is this mixture a solution? Explain your answer.
Answer: This is a mixture.
Explanation:
A solution consists of solute (which can be solid, liquid or gas) mixed in a given amount of solvent.
A mixture is a combination of two or more substances which are not present in a definite proportion.
We are given two solids: copper and silver.
As, they are not present in definite proportion hence, they are considered as mixtures.
What is the energy transformation taking place as a moving roller coaster slowly climbs a steep hill?
Potential energy to kinetic energy
Kinetic energy to potential energy
Radiant energy to chemical energy
Chemical energy to radiant energy
Answer:
The answer will be (B) Kinetic energy to potential energy
Explanation:
When something is in movement, it has kinetic energy. When that object beings to slow down it gains more potential energy than kinetic.
The potential needed to do work is called energy. It can exist in several forms like kinetic, potential, thermal, nuclear etc.
The correct answer is:
option B. Kinetic to potential energy.
This can be explained by the following:
When an article is in motion then the energy the object posses is called kinetic energy.When energy is stored in an article depending on its location is called potential energy.Kinetic and potential energy can get transmuted into each other.Therefore, when a roller coaster slowly climbs a steep hill then the kinetic energy gets transformed into potential energy.
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Why is soap used to remove grease
It works because soap is made up of molecules with two very different ends.
Hope this Helps
Soap breaks up the oil (grease) into smaller drops, which can mix with the water. This is why we use soap to clean grease because it break it apart causing it to wash off object clean. Hope this help!!!:)
Given the following reaction: H2SO4+2LiOH=Li2SO4+2H20, what mass of water is produced from 19 g of sulfuric acid?
Hi,
To solve the question, first of all we will find out the no. of moles of H2SO4 in 19 g of sulfuric acid.
As we know:
No . of moles = Mass/ Molar mass
No. of moles= 19 g/98.08 g
No. of moles= 0.1937
Now we know the no of moles of H2SO4 that will react with 2LiOH. We also know the molar equivalence of H2SO4 , and 2LiOH that will react.
So, the water that will be produced will be 2H2O and 1 Li2SO4 when H2SO4 that will react with 2LiOH.
0.1937 x 2x 18.01
=6.977
=6.98
Therefore, approximately 6.98 grams of water will be produced from 19 g of sulfuric acid.
Hope it helps!
Can anyone help me to solve this question?
Vinegar is a dilute ethanoic acid with a molecular formula of CH3COOH.
Find the percentage composition by mass of carbon in ethanoic acid.
The percentage composition by mass of carbon in ethanoic acid is 40%
Answer:
40.00 %
Step-by-step explanation:
Let's rewrite the formula of ethanoic acid as C₂H₄O₂.
The masses of each element are:
2C = 2 × 12.01 = 24.02 u
4H = 4 × 1.008 = 4.032 u
2O = 2 × 16.00 = 32.00 u
TOTAL = 60.05 u
=====
% C = 24.02/60.05 × 100
% C = 0.400 × 100
% C = 40.00 %
Which of the following electromagnetic waves carries the most energy?
A) ultraviolet waves
B) infrared waves
C) microwaves
D) visible light
In the electromagnetic spectrum , among the following ultraviolet rays carry the most energy.
What is electromagnetic spectrum?The electromagnetic spectrum consists of electromagnetic radiation which consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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Final answer:
Ultraviolet waves carry the most energy out of the options provided, as they have a higher frequency than visible light, infrared waves, and microwaves.
Explanation:
The electromagnetic wave that carries the most energy among the options provided is ultraviolet waves (A). The energy of electromagnetic waves is related to their frequency. The higher the frequency, the more energy the waves carry. Ultraviolet waves have higher frequencies than visible light, infrared waves, and microwaves, which means they have more energy. It is important to note that waves like X-rays and gamma rays carry even more energy than ultraviolet waves. The general order from lowest to highest energy in electromagnetic waves is radio, microwave, infrared, visible, ultraviolet, X-ray, and gamma.
Balance the following reaction: AI2O3+HCI-AICI3+H2O
the balanced equation is:
Al2O3 + 6HCl -> 2AlCl3+3H2O
what is the weighted-average mass of all known isotopes for an element
Atomic mass of an element is the weighted average.
When you rub your hands together on a cold day, you use friction to transform
A. mechanical energy into thermal energy.
B. thermal energy into nuclear energy.
C. nuclear energy into electrical energy.
D. electrical energy into electromagnetic energy.
A. mechanical energy to thermal energy