Answer:
the number of protons in the nucleus that are found in an atom is what determines an element's atomic number.why you may ask and thats because Protons contribute to the mass of an atom.(along with neutrons but they dont have a charge)but protons provide a positive charge to the nucleus.
Explanation:
because the atom is electrically neutral, the number of electrons must equal the number of protons.
The particles that contribute to the atomic number are the number of protons. Protons contribute to the atomic number because it is positively charged and present inside the nucleus. The correct option is c.
What is the atomic number?The quantity of protons in an atom's nucleus is known as the atomic number. The number of protons determines an element's identity. The atomic number contributes to the number of protons.
There are three subatomic particles present inside the particles. These are electrons, protons, and neutrons. The electron is negatively charged, a proton is positively charged, and a neutron is neutral.
Because the atom is electrically neutral, the number of electrons must equal the number of protons.
Thus, the correct option is c. protons.
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The question is incomplete. Your most probably complete question is given below:
a. atoms
b. neutrons.
c. protons.
d. electrons.
A scientist thinks she has discovered a new element. She took some samples to her colleagues and they performed some tests. Here is what they found: the element is a silver, malleable solid at room temperature the element is not very reactive with metals the element has 4 valence electrons the element has 32 protons in its nucleus Which of the discoveries listed above is the most influential in proving her theory incorrect?
Answer:
Proton number of the supposed discovery debunked the theory.
Explanation:
Proton number of an element is also its atomic number.
For the element in question to have had a proton number that wasn't 119, it could not have been a new element.
Furthermore, the characteristics described (proton number especially) describe exactly the Germanium element.
I believe this was helpful.
When you touch an object, why do you feel hot or cold?
Answer:
When two different objects touch heat is always transferred from the warmer object to the colder object. If you touch something hot, energy is transferred from the hot object to you.
Explanation:
Explain how the magnitudes of the solute-solute, solvent-solvent, and solute-solvent interactions compared in order to account for the solution formation process being endothermic or exothermic
Answer:
See explanation
Explanation:
Energy is absorbed by solute molecules as the solute-solute interactions are broken in order to make solute-solvent interactions as a solution is formed. The nature of solven-solvent interaction also determines the possibility of a solute-solvent interaction because like dissolves like. Polar substances can only dissolve in polar solvents and nonpolar substances only dissolve in nonpolar solvents.
Therefore, the solution formation process is exothermic if solute-solvent interaction is greater than solute-solute and solvent-solvent interaction.
Similarly, solution formation process is endothermic if the magnitude of solute-solvent interaction is less than the magnitudes of solute-solute and solvent-solvent interaction.
How many milliliters of water will it take to fill a 2 L bottle that already contains 1.87 L of water?
Answer:
0.00013
Explanation:
I'm pretty sure. I first subtracted 1.87 from 2. I got 0.13. The conversion from mL to L is 0.001. I multiplied 0.13 and 0.001 and got 0.00013 mL.
Question 5 Multiple Choice Worth 4 points)
(01.02 MC)
Two objects of different masses are sitting on different balance scales. Object A has a greater mass than object B. How will the weights of
the objects compare to each other?
The weights of the objects will be the same.
The weight of object A will be less than the weight of object B.
The weight of object A will be greater than the weight of object B.
This cannot be determined without knowing the actual mass of the objects.
Answer:
This cannot be determined without knowing the actual mass of the objects.
Explanation:
its like trying to compare the letter A and letter B
Answer:
Its A i took the test
Explanation:
Convert the Following
10 hm to cm
Answer:
1x 10⁴ m or 1000 meters
Explanation:
1 hectometer = 100 meters
10 hectometers = 10 x 100 meters = 1000m
or in scientific form = 1 x 10⁴
A 0.380 kg sample of aluminum (with a specific heat of 910.0 J/(kg x K)) is heated to 378 K and then placed in 2.40 kg of water that is at 293 K. If the system is left to reach its equilibrium state, what will the equilibrium temperature be? Assume that no thermal energy is lost to the external environment. Use 4.186 J/(g x K) as the specific heat of water.
Answer:
The equilibrium temperature of the system is 276.494 Kelvin.
Explanation:
Let consider the system formed by the sample of aluminium and water as a control mass, in which the sample is cooled and water is heated until thermal equilibrium is reached. The energy process is represented by First Law of Thermodynamics:
[tex]Q_{water} -Q_{sample} = 0[/tex]
[tex]Q_{water} = Q_{sample}[/tex]
Where:
[tex]Q_{water}[/tex] - Heat received by water, measured in joules.
[tex]Q_{sample}[/tex] - Heat released by the sample of aluminium, measured in joules.
Given that no mass is evaporated, the previous expression is expanded to:
[tex]m_{w}\cdot c_{p,w}\cdot (T-T_{w}) = m_{s}\cdot c_{p,s}\cdot (T_{s}-T)[/tex]
Where:
[tex]m_{s}[/tex], [tex]m_{w}[/tex] - Mass of water and the sample of aluminium, measured in kilograms.
[tex]c_{p,s}[/tex], [tex]c_{p,w}[/tex] - Specific heats of the sample of aluminium and water, measured in joules per kilogram-Kelvin.
[tex]T_{s}[/tex], [tex]T_{w}[/tex] - Initial temperatures of the sample of aluminium and water, measured in Kelvin.
[tex]T[/tex] - Temperature which system reaches thermal equilibrium, measured in Kelvin.
The final temperature is now cleared:
[tex](m_{w}\cdot c_{p,w}+m_{s}\cdot c_{p,s})\cdot T = m_{s}\cdot c_{p,s}\cdot T_{s}+m_{w}\cdot c_{p,w}\cdot T_{w}[/tex]
[tex]T = \frac{m_{s}\cdot c_{p,s}\cdot T_{s}+m_{w}\cdot c_{p,w}\cdot T_{w}}{m_{w}\cdot c_{p,w}+m_{s}\cdot c_{p,s}}[/tex]
Given that [tex]m_{s} = 0.380\,kg[/tex], [tex]m_{w} = 2.40\,kg[/tex], [tex]c_{p,s} = 910\,\frac{J}{kg\cdot K}[/tex], [tex]c_{p,w} = 4186\,\frac{J}{kg\cdot K}[/tex], [tex]T_{s} = 378\,K[/tex] and [tex]T_{w} = 273\,K[/tex], the final temperature of the system is:
[tex]T = \frac{(0.380\,kg)\cdot \left(910\,\frac{J}{kg\cdot K} \right)\cdot (378\,K)+(2.40\,kg)\cdot \left(4186\,\frac{J}{kg\cdot K} \right)\cdot (273\,K)}{(2.40\,kg)\cdot \left(4186\,\frac{J}{kg\cdot K} \right)+(0.380\,kg)\cdot \left(910\,\frac{J}{kg\cdot K} \right)}[/tex]
[tex]T = 276.494\,K[/tex]
The equilibrium temperature of the system is 276.494 Kelvin.
Answer:296
Explanation:
I got it right :) and mark me brainlest please
How many moles of argon, Ar, are in 1.63×1024 Ar atoms?
Answer:
Explanation:
Hello! To begin, remember Avogadro's number, 6.02*10^23 molecules!
You take your number of Ar atoms and divide it by Avogadro's number:
[tex]\frac{1.63 * 10^{24} Ar atoms}{6.02 * 10x^{23} }[/tex] = 2.7076412 moles...
round to 3 sig dig's (based on "1.63")
Final answer = 2.71 moles Ar
Convert 3.99/gallon to dollars per liter
Explanation:
Gas prices in the U.S. are given by the gallon; to convert them to liters, you'll divide the price by the number of liters in a gallon, 3.78541. So if gas costs $3.50 per gallon, you have $3.50 ÷ 3.78541 = $0.92460 per liter, which would typically be rounded to $0.92 per liter.
Question 30 (10 points) All unauthorized experiments are prohibited . O True False
Answer:
All unauthorized experiments are prohibited. You are allowed to enter the chemical preparation/storage area any time you need to get an item. Laboratory aprons should be worn during all lab activities. It's okay to pick up broken with our bare hand as long as the glass is placed in the trash.
Explanation:
Cohesion, adhesion, and surface tension are characteristics of water that ________. increase when pH increases increase when temperature increases are a result of hydrogen bonding are a result of polar covalent bonding
Answer:
are a result of hydrogen bonding.
Explanation:
The surface tension is the amount of energy required to stretch or increase the surface of a liquid by a unit area. Liquids that have strong intermolecular forces also have high surface tensions. Thus, because of hydrogen bonding, water has a considerably greater surface tension than most other liquids.
Another example of surface tension is capillary action. A thin film of water adheres to the wall of the glass tube. The surface tension of water causes this film to contract, and as it does, it pulls the water up the tube. Two types of forces bring about capillary action.
One is cohesion, which is the intermolecular attraction between like molecules (in this case, the water molecules). The second force, called adhesion, is an attraction between unlike molecules, such as those in water and in the sides of a glass tube. If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the water in the tube.
This characteristics of water are a consequence of a particularly strong type of intermolecular attraction, called the hydrogen bond, which is a special type of dipole-dipole interaction between the hydrogen atom in a polar bond, such as N-H, O-H, or F-H, and an electronegative O, N, or F atom.
in a chemical reaction known as decomposition, carbonic acid breaks down into water, and what other compound?
Answer: it’s carbon dioxide
Explanation:
This is it because decomposition takes place when carbonic acid breaks down So that’s why I put carbon dioxide
Answer:
carbon dioxide
Explanation:
in our country .we have to study it by heart.
trust me
When two carbon atoms are joined by a double bond, how many electron pairs are shared between the two carbons
Answer:
Two (2) electron pairs
Explanation:
The sharing of electron pairs by atoms forms a type of bond called COVALENT bond. Atoms that form covalent bonding (share electrons) do so in order to fill their outermost electron shells, hence, gain chemical stability.
However, when two atoms like carbon share TWO PAIRS of electrons with each other, a DOUBLE BOND is formed. An example is the double bond formed in Ethylene (2HC=CH2). A total of four valence electrons (a pair from each carbon) are shared between the two carbon atoms.
What are the three major subatomic particles?
Answer:
the answer will be protons neutrons and electrons:)
Explanation:
write the chemical symbols for three different atomic cations with 20 protons
Answer:
The 3 elements that has 3 electrons are:
Li, Be+ and B2+
Explanation:
Hoped that helped :)
The label says the rope is 2.15 ft long, John measures the rope as 1.85 ft. What is the percent error?
Answer:
2.15-1.85=0.3.
so therefore.
0.3/2.15×100
=13.953 ~ 14.
Select all that apply. Atoms are made up of _____. protons neutrons compounds elements electrons
Answer:
protons, nuetrons, electrons
Explanation:
compounds and electrons are made up of atoms.
Answer:
protons, nuetrons, electrons
Explanation:
what does balancing the charges mean when writing an ionic formula
Answer:
Balancing the charges in compound's ionic formula means ensuring that the sum of the charges of the radicals making up the ions is zero that is altogether, there is no net charge of the radicals
Explanation:
The guide to writing an ionic formula is as follows;
The radical with the positive charged ion or cation, is written first and the number of the atom with the charge is written as a subscript followed by the radical with the negatively charged ion, is written and the number of the atom possessing the charge is written as a subscript
The sum charges of the of positive and negative ions must be zero such that must be no net charge of the ions.
3. An adult rhino is 1350 kilograms. What is its mass in micrograms? Please write your answer in correct Scientific Notation. Micrograms
Answer:
1.35×10¹² μg
Explanation:
Mass (Kg) = 1350 Kg
Mass (μg) =?
Thus, we can obtain the mass of the adult rhino in micrograms (μg) by converting 1350 Kg to microgram (μg) as follow:
1 Kg = 1×10⁹ μg
Therefore,
1350 Kg = 1350 kg / 1 kg × 1×10⁹ μg
1350 Kg = 1.35×10¹² μg
Therefore, 1350 Kg is equivalent to 1.35×10¹² μg.
Answer:
To convert 1350 kilograms to micrograms, we need to multiply by a conversion factor that takes us from kilograms to micrograms.
1 kilogram = 1,000,000,000 micrograms (by definition)
So,
1350 kilograms = 1350 x 1,000,000,000 micrograms
= 1.35 x 10^12 micrograms (in scientific notation)
Therefore, the mass of an adult rhino is 1.35 x 10^12 micrograms.
(A)Ch3ch2ch2ch2oh + [o] =?
(B)CH3CH2CH(OH)CH3 + H/heat=?
(C) (CH3)2CH=CH2 + Br2/CCl4 =?
(D) cyclohexane + Br2/peroxide
Answer:
d
Explanation: i think
elements, compounds and mixtures
Explanation:
10ml = Volume of water
14ml = Volume of water + Volume of marble
Therefore the volume of the marble is 4ml.
The volume of water is 10 ml and the total volume of the cylinder is 14 mi, then the volume of the marble is 4ml.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The basic formula for volume is length, breadth, and height, as opposed to length, width, and height for the area of a rectangular shape. The calculation is unaffected by how you refer to the various dimensions; for instance, you can use "depth" instead of "height."
Volume is a unit used to describe how much space a substance takes up. A physical material with mass and space-occupying properties is referred to as matter. The usual measurement of volume in physical sciences like chemistry is in cubic meters (m3).
The volume of water is 10 ml
Volume of water + Volume of marble
=14 ml
Thus, the volume of the marble is 4ml.
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How is using a bow and arrow mechanical and potential energy?
Answer:A bow and arrow possesses mechanical energy. When the arrow is drawn it has potential energy and when it is released it produces a force to propel the arrow towards the aimed target, therefore giving the arrow kinetic energy. When you combine both energies it creates mechanical energy.
Explanation:
Answer:
Building up potential energy when pulling it back
Explanation:
What is the density of an object that has a mass of 6.82g and when placed in water displaces the volume from 1.67mL to 7.87mL? Record your answer to the hundreds place.
Answer:
1.10 g/mL
Explanation:
The amount of volume an object displaces is the amount of volume that object takes up.
7.87 - 1.67 = 6.2
The object has a volume of 6.2 mL.
You have the mass (6.82 g) and the volume (6.2 mL). Divide the two value to find the density.
(6.82 g)/(6.2 mL) = 1.10 g/mL
The density of the object is 1.10 g/mL.
20. What will be the concentration, in mol dm, of the resulting solution when 200 cm' of
0.200 mol dmhydrochloric acid, HCl(aq) are mixed with 300 cm of 0.100
mol dm HCl(aq)?
Answer:
0.140mol/dm^3.
Explanation:
200cm3 = 0.2dm^3.
0.2dm^3 * 0.200mol/dm^3 = 0.040mol
300cm^3 = 0.3dm^3
0.3dm^3 * 0.100mol/dm^3 = 0.030mol
The number of moles is 0.070mol of HCl (aq).
The volume of the solution is 0.5dm^3.
Hence the concentration is 0.140mol/dm^3.
The concentration is 0.140mol/dm³.
What is concentration?The concentration of solution is the amount of solute that are dissolved in solution.The concentration can be measured by dividing the weight of solute in grams to the volume of solution.200cm³ = 0.2dm³
0.2dm³ x 0.200mol/dm³= 0.040mol
300cm³ = 0.3dm³
0.3dm³ x 0.100mol/dm³ = 0.030mol
The number of moles is 0.070mol of HCl
The volume of the solution is 0.5dm³
Concentration = Number of moles/volume in dm³
= 0.070mol/0.5dm³
= 0.140mol/dm³
Hence, the concentration is 0.140mol/dm³
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PLEASE HELP! The density of baby oil is 0.820 g/mL. What is the mass if the volume is 57.1 mL of baby oil.
Answer:
Density=mass / volume.
0.820=mass /57.1.
mass=0.820×57.1
=46.822g.
what are pollen grains? where are
are they formed?
Answer:
Only ask one question
Explanation:
What mass, in grams, of water would form if 4.8 grams of hydrogen reacted with 38.4 grams of oxygen?
Answer: 4.8 grams of hydrogen is 2.4 moles, and 38.4 grams of oxygen is 1.2 moles. This is exactly the Stoichiometry ratio of the reaction, therefore the two will both completely react giving rise to the same total mass of water.
What is the difference between sucrose? Table sugar? And Artificial Sweeteners?
SUCROSE IS A NATURALLY OCCURRING SUGAR, COMMONLY KNOWN AS TABLE SUGAR. SUCRALOSE, ON THE OTHER HAND, IS AN ARTIFICIAL SWEETENER, PRODUCED IN A LAB.....
HOPE IT HELP.....☺☺☺
What is generally the best approach when liquid from a large reagent bottle is needed in an experiment
Answer:
See the answer below
Explanation:
The best approach would be to pour the liquid from the large reagent bottle into a small-size beaker or reagent bottle first, before measuring the required quantity out into the reaction vessel. This is necessary in order to maintain safety in the laboratory.
Pouring the liquid directly from the large reagent bottle into the measuring cylinder or directly into the reaction bottle can compromise safety in the laboratory. The liquid might splash out and cause harm to the handler or create other harmful circumstances in the laboratory.
The information regarding the liquid should be explained below;
The following information should be considered;
The best approach should be to pour the liquid from the large reagent bottle into a small-size beaker or reagent bottle first, prior determining the required quantity out into the reaction vessel. This is necessary in order to maintain safety in the laboratory.Learn more: https://brainly.com/question/5566317?referrer=searchResults
A serving of potato chips contains 2400 mg of sodium. How many significant figures are in the number? Question 3 options: 4 3 2 1
Answer:
2
Explanation:
The last zeros don't count because there is no decimal. So only 2,4 are left over. Counting them gives us 2 digits. So 2.