Answer: 57
Explanation: Because the atom is neutral, it’s #e= Protons + zero charge (for all neutral atoms)
Hence, #e= 57+0=57 electrons
An electrically neutral atom have 57 protons so it will be having 57 electrons .
What do you mean by electrically neutral atom ?An atom is electrically neutral when the overall charge of an atom is zero. The atoms are made of three subatomic particles called protons, electrons and neutrons.
Protons are positively charged particles, electrons are negatively charged and neutrons are neutral.
The number of electrons is equal to the number of protons due to which positive and negative charge cancels each other out.
According to the question,
Because the atom is neutral , it’s
Electrons= Protons + zero charge (for all neutral atoms)
Hence,
Electrons= 57+0
=57 electrons
Hence, an electrically neutral atom have 57 protons so it will be having 57 electrons .
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Help with science!!!!
Answer:
the answe would be (c) temperate continental
Explanation:
Which type of wave has a longer wavelength than infrared radiation but it's shorter than radio waves
Answer: Infrared rays
Explanation:
Marcus has a mass of 75 kg here on Earth. What would his mass be if he was standing on
the Moon?
Remember, gravity on Earth is 9.8 m/s2 gravity on the moon is 1.6 m/s2.
NO LINKS OR FILES PLEASE
Answer:
It is given that the mass of a man is 75 Kg in earth. Then his mass would be same in moon as mass of anything cannot be changed. The weight of the man in earth can be calculated by W=mg=75×9.8=735 N.
NO LINKS please help!
Answer:
True True False
Explanation:
I need y’all’s help please
Answer:
6 mass
Explanation:
because the si unit of gram is mass
Joel is studying a certain organ system of the human body. It interacts with the respiratory system to transport oxygen and carbon dioxide gases between the lungs and different parts of the body. It interacts with the digestive system to transport nutrients throughout the body, and it interacts with the urinary system to remove wastes from the body.
What is Joel studying?
A. the nervous system
B. the circulatory system
C. the skeletal system
D. the muscular system
A mixture of 0.119 g of boron trifluoride (BF3) gas and 0.007 g of hydrogen sulfide (H2S) gas is held in a 1.74 L vessel at 19.24 ∘C. What are the mole fractions of the individual gases?
Answer:
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Explanation:
gshsjsjjdnbshd had 3the 3most 3PM and humiliatin to get 3rid 3in the body 3to 33and to remove
Match each term with the appropriate definition.
spectroscopy
the study of the absorption and emission of
light by atoms
absorption spectrum
represents energy absorbed as dark bands
atomic spectrum
represents energy emitted or absorbed
during electron jumps
emission spectrum
represents energy emitted as colored lines
Answer:
Spectroscopy — the study of the absorption and emission of light by atoms
Absorption spectrum — represents energy absorbed as dark bands
Atomic spectrum — represents energy emitted or absorbed
during electron jumps
Emission spectrum — represents energy emitted as colored lines
Explanation:
Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.
What is spectroscopy?Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.
The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are correct.
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explain why carbon dioxide is a gas, water is a liquid, and salt is solid at room temperature based on how the particals are held together.
Please help I'm having a hard time explaining this.
Answer:
Carbon dioxide is held together by weak intermolecular forces (only London dispersion LD) and is a non-polar molecule. Because of this weak attraction, it exists as a gas. Water on the other hand is polar (dipole forces DP), and has a stronger hydrogen bond existing within it (in addition to LD). This makes it attract itself more than say carbon dioxide molecules, so it commonly exists as a liquid. Finally, salt like water is polar, and has ionic bonds that are even stronger than a hydrogen bond. This makes salt have a great attraction to itself, sticking together as a solid because its molecules cant easily be broken up.
Explanation:
These are the strongest intermolecular forces ranked from strongest to weakest.
1. Network Covalent
2. Ionic
3. Hydrogen Bonding
4. Dipole Dipole
5. London Dispersion
What is the molarity of a solution containing 3.6 mol of KCl in 750 mL?
Answer:
[tex]\boxed {\boxed {\sf 4.8 \ M \ KCl}}[/tex]
Explanation:
The molarity of a solution is found by dividing the moles of solute by the liters. of solvent.
[tex]molarity=\frac{moles}{liters}[/tex]
We know the solution has 3.6 moles of potassium chlorine. We know there are 750 milliliters of solvent, but we need to convert this to liters.
1 liter is equal to 1000 milliliters. Set up a proportion.[tex]\frac {1 \ L }{1000 \ mL}[/tex]Multiply by 750 mL and the units of mL will cancel.[tex]750 \ mL * \frac {1 \ L }{1000 \ mL} = \frac {750 \ mL}{1000 \ mL}= 0.75 \ L[/tex]Now we know the moles and liters, so we can calculate molarity.
moles= 3.6 mol KCl liters= 0.75 LSubstitute these values into the formula.
[tex]molarity= \frac{3.6 \ mol \ KCl}{0.75 \ L}[/tex]
Divide.
[tex]molarity= 4.8 \ mol \ KCl/ L[/tex]
1 mole per liter is equal to 1 molar. Our answer of 4.8 moles of potassium chloride per liter is equal to 4.8 M KCl[tex]molarity= 4.8 \ M \ KCl[/tex]
The molarity of the solution is 4.8 M KCl.
I need help with science pls help me :(!
What do the nuclei of H hydrogen atoms contain?
Answer:
brainliest plss
Explanation:
Most hydrogen atoms have a nucleus with only a single proton. About 1 in 10,000 hydrogen nuclei, however, also has a neutron; this particular isotope is called deuterium. An extremely rare hydrogen isotope, tritium, has 1 proton and 2 neutrons in its nucleus. ... Most hydrogen atoms have only a proton in the nucleus
help me pleaseeeee #5
Answer:
Red
Explanation:
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs
and the water temperature drops rapidly. Which of the following statments best supports this
observation?
A. An endothermic reaction occurred
B. The water was originally warmer than the compound
C. An exothermic reaction occurred
D. The beaker was contaminated by another compound
Answer: An endothermic reaction occurred
Explanation:
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs and the water temperature drops rapidly which indicates that an endothermic reaction occurred. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
An endothermic reaction means that heat is absorbed during this reaction (enthalpy change value has a positive sign).
During the endothermic reaction heat is absorbed from the surroundings (here, water) and hence the temperature of the water in which the reaction is taking place decreases.
Hence, option A is correct.
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What are some benefits and limitations of using models.
Explanation:
Models do not behave exactly like the things they represent. Accuracy—In order to make models simplistic enough to communicate ideas some accuracy is lost. For example, ball and stick models of atoms do not show all the details that scientists know about the structure of the atom.
Modeling Benefits
Viewing systems from multiple perspectives.
Discovering causes and effects using model traceability.
Improving system understanding through visual analysis.
Discovering errors earlier and reducing system defects.
Exploring alternatives earlier in the system lifecycle.
What are the six atmospheric conditions that make weather?
Is hydrogen the only non-metal positive ion?
Answer:
Why hydrogen is the only non-metal elements which loses electron to form positive ions ? ... When hydrogen bonded with most electronegative element then it forms a positive ions but when it bonded with less electronegative element then it forms a negative ion.
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A fluorinated organic gas in a cylinder is com-
pressed from an initial volume of 930 ml at
156 Pa to 400 mL at the same temperature.
What is the final pressure?
Answer in units of Pa.
Answer:
Final pressure = 362.7 Pa
Explanation:
Given that,
Initial volume, V₁ = 930 ml
Initial pressure P₁ = 156 Pa
Final volume, V₂ = 400 mL
We need to find the final pressure. We know that the relation between volume and pressure is inverse i.e.
[tex]V\propto \dfrac{1}{P}\\\\\dfrac{V_1}{V_2}=\dfrac{P_2}{P_1}\\\\P_2=\dfrac{V_1P_1}{V_2}\\\\P_2=\dfrac{930\times 156}{400}\\\\P_2=362.7\ Pa[/tex]
So, the final pressure is equal to 362.7 Pa.
If 500.0 mL of olive oil, initially at 25.0°C, receives 1.25 kJ of heat energy, what is its final temperature? (Specific heat olive oil = 2.0 J/g °C, density= 0.19 g/mL)
Answer:
500.00
Explanation:
400+20+50+49+17+59
Which of the following is best classified as a compound?
A. Oxygen, because it contains two of same
B. Carbon dioxide, because it contains two different types of atoms
Answer:
The answer is B
Explanation:
Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.
Hope this helps!
what is the difference between a substance that low concentration and one high concentration
Answer:
Explained below
Explanation:
First of all we need to know that diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
Now, the meaning of a substance having higher concentration or lower concentration is that the amount of solute of a given concentration is higher in the higher concentration region than that in the region of lower concentration.
Suppose that a sample of gas occupies 187 mL
of volume at 298 K and a pressure of 277 torr.
What would be the volume (expressed of
this sample) if the pressure were changed to
571 torr at 298 K?
Answer in units of mL.
Answer:
V2 = 90.7 mL
Explanation:
pressure and volume are inversely proportional, if the pressure is increased, the volume will decrease. In an isothermal process:
p1V1 = p2V2
V2 = p1V1/p2 = (277 torr×187 mL)/571 torr
V2 = 90.7 mL
Magnesium hydroxide is an ingredient in some antacids. Antacids react with excess hydrochloric acid in the stomach to relieve
indigestion.
a) balance the reaction that occurs between Mg(OH)2 and HCI.
(select choice) Mg(OH)2 + (select choice) HCI = (select choice) MgCl2 + (blank) H2O
b) what are the mole ratios that would be used to determine the number of moles of MgCl2 produced when HCl reacts with Mg(OH)2.
(blank) mol MgCl2/ (blank) mol Mg(OH)2
(blank) mol MgCl2/ (blank) mol HCI
Answer:
a. 2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. 1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
Explanation:
a. The reaction of an acid (HCl) with a base (Mg(OH)2) produce water (H2O) and the salt (MgCl2):
_HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the Cl:
2HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the oxygen:
2HCl + _Mg(OH)2 → _MgCl2 + 2H2O
The reaction is now balanced
2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. Based on the balanced reaction, the moles ratios are:
1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
What happens to wavelength as wave frequency increases?
Answer:
As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
How many moles are in 100 grams of gold?
Answer:
0.01 mole
Explanation:
What two types of elements are ionic compounds made of?
Answer:
ionic compounds are made from metal and non mental elements
Explanation:
in this case it is know as an ionic compound because it contains a charge. For example, NaCl is simply a compound as it contains no charges (the charges cancel out as Cl is -1 and Na is +1)
but OH- is an ionic compound as it has a charge if -1 (O has a -2 charge and H has a +1 charge, so -2+1=-1 so OH has -1 charge)
.How many moles of NaCl are in 28.0 g?
Answer:
0.48 mols
Explanation:
to convert moles to mass u need to divide mass by the molar mass of NaCl which is 58.44g/mols.
28g ÷ 58.44g/mol = 0.48 mols
Help meeeeeeeeeeewweeee
Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.
Hope This Helps You ❤️When [H+] = 3.33 x 10-7 what is the ph?
Answer:
6.48Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]
We have the final answer as
6.48Hope this helps you
A liquid changes color as it cools and becomes solid. How can you confirm
the type of change that took place?
A. Determining that the mass of the solid and liquid are different
would confirm that a chemical change took place.
B. Identifying the solid and liquid as the same substance would
confirm that a physical change took place.
O c. The color change and the formation of a solid confirm that a
chemical change took place.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Answer: Hello, There! your answer is Below.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
Hope this helps you!!!
Have a great day!!!
When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.
What are physical changes?Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.
The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.
Therefore, option D. solid from liquid shows a physical change.
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