Answer:
35
Explanation:
Given parameters:
Atomic number of zinc = 30
Mass number of zinc = 65
Unknown
Number of neutrons = ?
Solution:
The mass number of an atom is the sum of its protons and neutrons;
Mass number = Protons + neutrons
Atomic number is the number of protons in an atom;
Atomic number = Protons
So;
Mass number = Atomic number + Neutrons
Neutrons = Mass number - Atomic number
Neutrons = 65 - 30 = 35
The number of neutrons in the atom is 35
when water changes state from a liquid to a solid is energy absorbed or lost?
Answer:
Loses
Explanation:
liquid changes into solid, heat is released. The energy released upon freezing, known as the enthalpy of fusion, is a latent heat, and is exactly the same as the energy required to melt the same amount of the solid.
Answer:
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings.
Explanation:
40POINTS AND BRAINLIEST Discuss the orders in which electrons are filled in the s and d subshells of the first three elements in group11
Step 1: add electrons to fill the 1s subshell (maximum of 2 electrons), when this is full, go to step 2. Step 2: add electrons to fill the 2s subshell (maximum of 2 electrons), when this is full, go to step 3. Step 3: add electrons to fill the 2p subshell (maximum of 6 electrons), when this is full, go to step 4. Step 4: add electrons to fill the 3s subshell (maximum of 2 electrons), when this is full, go to step 5. Step 5: add electrons to fill the 3p subshell (maximum of 6 electrons), when this is full, go to step 6. Step 6: add electrons to the 4s subshell (maximum of 2 electrons), when this is full, go to step 7. Step 7: add electrons to the 3d subshell (maximum of 10 electrons), when this is full, go to step 8. Step 8: add electrons to the 4p subshell (maximum of 6 electrons), when this is full, go to step 9. etc
So for Cu would be: 1s^22s^22p^63s^23p^63d^9
Ag would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^1
Au would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^25p^64f^145d^106s^1
NH3 is a _______________
Answer:
compound
Explanation:
Answer:
your answer would be compound
C12H7Cl3FNaO2 what are the elements in that chemical formula
Answer:
hope it helped you
Explanation:
Sodium fluoride - 5-chloro-2-(2,4-dichlorophenoxy)phenol (1:1:1) | C12H7Cl3FNaO2 |
name the gas formed when metals react with dilute hcl
Answer:
im maybe 80% sure it's hydrogen gas
Answer:
When a metal reacts with dilute hydrochloric acid, it forms a metal chloride salt and hydrogen gas.
Why are prefixes used in naming covalent compounds?
A. The prefixes identity the only way the atoms can combine.
B. The same atoms can combine in more than one ratio.
C. The atoms can have different numbers of valence electrons
D. Oxidation states of the atoms are identified with prefixes
Answer:
B
Explanation:
The same atoms can combine in more than one ratio.
The same atoms can combine in more than one ratio. Hence, option B is correct.
What is a covalent bond?A covalent bond shares one or more pairs of electrons between two atoms.
Covalent bonds are the bond between non-metals that are linked together by shared electrons. Covalent compounds are named with different prefixes to identify the number of atoms in the molecule.
Hence, option B is correct.
Learn more about covalent bond here:
brainly.com/question/19382448
#SPJ5
H2+ 02 H2O
how do you balence this
Answer:
As the number of atoms in the reactants side is equal to the number of atoms in the product side, the reaction is balanced
Two hydrogen molecules per oxygen molecule are produced because water (H2O) has a ratio of two hydrogen atoms to one oxygen atom. A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B.
H2O is the chemical formula of water. It means that each molecule of water is made up of two hydrogen atoms, indicated by the letter H, and a single oxygen atom, represented by the letter O. Water is chemical substance with no smell, taste or color.
What is the freezing point on this graph?
Answer:
Point a becuse it is the closest to -5*
Explanation:
Answer:
-5
Explanation:
Negative numbers get you confused.
- = Negative
5 = Number
You know 5 right?
I I I I I - 5
5 is a really less number already.
If you add a negative it will be double small.
Now lets figure out the problem:
What is the freezing point on this graph?
-5 is the smallest number
5 is bigger than -5
15 is bigger than 5 and -5
25 is bigger than all the numbers.
I know what your thinking. 25 is totally not the answer. Its the biggest number. Freezing is a very low number. What number is the lowest out of -5, 5, 15, 25. You see -5.
Therefore, -5 is freezing.
BE FIRST TO ANSWER PLEASEEE ASAP! :D
Answer:
I want to say E or B
Explanation:
Which element would be the least similar to magnesium
Answer:
Chemistry Q&A Library decide which element probably forms a compound with chlorine that has a chemical formula most and least similar to the chemical formula of the compound formed by chlorine and magnesium most and least similar to magnesium:strontium,rubidium,phosphorus, cesium
Explanation:
hope this helped ❤✨
Explain why the gamma rays do not bend.
How can you tell if an element is a metal or a nonmetal??
Answer:
Elements to the left of the line are considered metals. Elements just to the right of the line exhibit properties of both metals and nonmetals and are termed metalloids or semimetals. Elements to the far right of the periodic table are nonmetals. The exception is hydrogen (H), the first element on the periodic table.
Explanation:
Answer:
looking at its metallic luster
Explanation:
Elements may be classified as either metals or nonmetals based on their properties. Much of the time, you can tell an element is a metal simply by looking at its metallic luster, but this isn't the only distinction between these two general groups of elements. Most elements are metals.
Which of the following is the abbreviation for the element Gold?
Answer:
Au
Explanation:
trust me, the abbrevation for gold is Au. chemicaly, Medicaly, and in dentistry
Gases ___ out and fill their container completely
Answer: Gases have the lowest density of the three, are highly compressible, and completely fill any container in which they are placed. Gases behave this way because their intermolecular forces are relatively weak, so their molecules are constantly moving independently of the other molecules present. Solids, in contrast, are relatively dense, rigid, and incompressible because their intermolecular forces are so strong that the molecules are essentially locked in place.
Explanation:
what makes alkali metals a family?
Answer:
The metals in this group are lithium, sodium, potassium, rubidium, cesium, and francium. The gas hydrogen is also put in this group because it shares similar reactivity with the alkali metals.
I don't know if this is what you wanted or not sorry if it isn't
Which changes involve forming or breaking chemical bonds?
A.burning and digesting
B.boiling and melting
C.burning and melting
D.rusting and cutting
Answer:
d
Explanation:
i took the test
Which of the following occurs when a liquid becomes a gas
Answer:
Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.
Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Answer:
A
Explanation:
Answer:
A. Sorry if wrong, but if i'm right can you mark brailniest pls?
Question 1
Why can't wee see atoms?
Answer:
They're too small
Explanation:
Atoms are smaller than the wavelength of visible light
Answer:
too small
Explanation:
Put the following scientists in order of their discoveries: 1. Dalton, 2. Bohr, 3. Rutherford, 4. Democritus, 5. Thomson
Please help me I really need the answer
An airplane travels east with a velocity of 90 m/s. How long does it take the airplane to cover a distance of 405 meters?
A. 4.5 seconds
B. 60.0 seconds
C. 90.0 seconds
D. 3.0 seconds
Answer:
The answer is option AExplanation:
To find the time taken given the velocity and distance covered we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
From the question we have
[tex]t = \frac{405}{90} \\ [/tex]
We have the final answer as
4.5 sHope this helps you
Which statement is not
true?
A. Protons are positive and neutrons are
neutral
B. Electrons have the most mass of the
subatomic particles
C. Protons and Neutrons are found in the
nucleus
Electrons are found outside the nucleus
and have a negative charge
Answer:
B. Electrons have the most mass of the
subatomic particles
Compared to the mass of neutron and proton, mass of electron is negligible.
Answer:
B
Explanation:
when creating a Bohr model, you will usually mark protons + or P and neutrons are usually 0 or N.
Electrons are on the rings surrounding the nucleus, but everything else is inside.
Electrons are typically represented by - or E
Does Magnesium or Carbon have similar properties to Beryllium ? Which one ?
Answer:
Yes, Magnesium
Electron configuration always starts with the lowest energy electrons.
true or false
Answer:
True I think..-
Explanation:
Sorry if it's wrong.-
The distance of the Kentucky Derby, a classic horse race, is 1.25 miles. How is this distance expressed in furlongs ?
the human eye has three types of cones cells. damage to any one of the types of cone cells doesn't cause total blindness because of the
A. presence of rod cells
B. other two functional Cone cells
C. presence of optic nerves
they have rod cells - this helps them be able to see colors through a spectrrum located in the retina
HELPP
A monatomic ion always have one unit of charge. (+1 or -1) on the species
true or false
Answer:
No, this is invalid. The term mono in front of monoatomic simply refers to the number of atoms that are present in a compound or simply by itself it has no relationship with respect to the overall charge of the compound.
Explanation:
For instance Ca is considered as a monoatomic ion but it has a charge of +2.
Explain the law of conservation of mass.
Answer:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.
Explanation:
Your answer should be- that in a chemical reaction mass is neither created nor destroyed.
Explanation:
Is that good?
During which phase of the moon do neap tides occur?
A: full
B: gibbous
C: new
D: quarter
Plz I need help I think it’s A plz tell me before time runs out
IT IS NOT A
the full moon is incorrect I just don know the right answer sorry
need a top pick for another slide to talk about crystals
Answer:
tigers eyes
Explanation: