Weight changes with location, but mass does not. True or False?
Answers
Answer:
true
Explanation:
your weight can change if you are let's say on the moon, but your mass doesn't.
explanation:
i just know
Related Questions
3
The chemical formula NHCl indicates that the formula contains -
A 1 nitrogen atom, 1 hydrogen atom, and 1 chlorine atom
B 1 nitrogen atom, 4 hydrogen atoms, and 4 chlorine atoms
Ci nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom
D 4 nitrogen atoms, 4 hydrogen atoms, and 1 chlorine atom
Answers
The formula contains : C. 1 nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom
Further explanationGiven
NH₄Cl compound
Required
The number of atoms
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
A molecular formula is composed of two or more elements formed of the same or different types.
A subscript indicating the number of atoms forming a molecule
So for NH₄Cl , there are 3 different elements, N, H and Cl, and the number is shown from the subscript
N : 1 atomH : 4 atomsCl : 1 atom
Chemical & Earth Science Name:______________________________________
Date: ________________________________
Nonmetals & Metalloids Worksheet
Write the letter of the correct answer on the line at the left.
1. _____ Which of the following is NOT a
property of most nonmetals?
A found on the right side of the
periodic table
B solids tend to be dull and brittle
C excellent electric conductivity
D many are gases at room temperature
3. _____ Two of the same atoms bonded
together is called a(n)
A isotope
B diatomic molecule
C binary atom
D semiconductor
2. _____ The only nonmetal in Group 14 is
A carbon
B oxygen
C nitrogen
D fluorine
4. _____ The highly reactive nonmetals of
Group 17 are called the
A noble gases
B metalloids
C halogens
D actinides
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
5. ___________________ Atoms of nonmetals usually lose electrons when they combine
with other atoms.
6. __________________ When two or more atoms bond by sharing electrons, they form
a molecule.
7. __________________ The elements that have some properties of metals and some
properties of nonmetals are called halogens.
8. __________________ Helium has chemical properties so different from those of the
other elements that it cannot be placed in any group.
9. __________________ Substances that can carry electric current under some
conditions but not under others are called semiconductors.
10. __________________ The Group 15 element oxygen is used to make compounds
known as fertilizers.
Answers
Answer:
whoa this question is long
Explanation:
how did u write it gosh
An unknown substance is a white solid at room temperature and has a melting point of 78 "c. Which of the following substances is most likely to be the identity of
the unknown sample?
Answers
The molecular solid naphthalene had always been the unidentified solid with such a melting point around 78 degrees Celsius.
At normal temperature as well as pressure, an ionic compound would be almost certainly a solid, even though a covalent compound could be a solid, a liquid, or even a gas.
The temperature when a solid can transform into a liquid is known as that of the melting point.
Strong intermolecular interactions have led to greater melting points for some substances, while weakly attractive molecules have lower melting points.
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Question 20 of 30
What does the absorption spectrum of an atom show?
A. The wavelengths of light that an atom gives off when electrons
fall back to lower energy levels
OB. The temperature of the phase transitions of the element at
different pressures
O C. The amount of energy that is absorbed as the element changes
phase
O D. The wavelengths of light that cause the electrons in the atom to
move to higher energy levels
Answers
The wavelengths of light that cause the electrons in the atom to move to higher energy levels. Option D
What is the atomic spectrum?The wavelengths of light that are absorbed by an atom as its electrons move from lower to higher energy levels are shown by the atom's absorption spectrum. When exposed to light, atoms are able to absorb a range of wavelengths depending on the energy differences between the levels of their electrons.
The encouragement of electrons to higher energy levels within the atom results from this absorption. The absorption spectrum, which is often represented graphically as dark lines or bands on a continuous spectrum, is a representation of the wavelengths of light that are absorbed by the atom.
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According to the law of conservation of momentum, what is the momentum of the object after the collision? 4,500 g · m/s 1,750 g · m/s 1,500 kg · m/s 3,000 kg · m/s
Answers
Answer:
C. 1,500 kg · m/s
How much H₂ is needed to react with 6.58 g of O₂ in this reaction?
H₂ + O₂ --> H₂O
Answers
For this reaction the balanced chemical equation is
2
H
2
+
O
2
→
2
H
2
O
The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.
2
m
o
l
H
2
:
1
m
o
l
O
2
:
2
m
o
l
H
2
O
The mole ratio for
O
2
H
2
O
is:
2
m
o
l
H
2
:
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
or
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
:
2
m
o
l
H
2
O
1
m
o
l
O
2
2
m
o
l
H
2
O
or
2
m
o
l
H
2
O
1
m
o
l
O
2
I hope this was helpful.
Practice problem 9.4
the equilibrium constant for the system at this temperature?
6.4 x 10 mol/dm³ of N2, 1.7 x 10 mol/dm³ of O2 and 1.1 *10^ - mol/dm³ of NO. What is
An equilibrium mixture of N_{2} U_{2} and NO gases at 1500K is determined to consist of
Answers
The equilibrium constant for the system at the given temperature is 1.1×10⁻⁵
What is equilibrium constant?Equilibrium constant for a given is defined as the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient
For example:
eB <=> cD
The equilibrium constant for the reaction above is given as
Ke = [D]^c / [B]^e
How to determine the equilibrium constant N₂(g) + O₂(g) <=> 2NO(g)[N₂] = 6.4×10⁻³ M[O₂] = 1.7×10⁻³ M[NO] = 1.1×10⁻⁵ MEquilibrium constant (Ke) =?The equilibrium constant for the reaction reaction can be obtained as follow
Ke = [NO]² / [N₂][O₂]
Ke = [1.1×10⁻⁵]² / [6.4×10⁻³][1.7×10⁻³]
Ke = 1.1×10⁻⁵
Thus, the equilibrium constant for the reaction at the given temperature is 1.1×10⁻⁵
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Complete question
See attached photo
40.0 ml of .2n naoh is mixed with 60.0 ml of .3n hcl. what is the normality of the remaining h if the final volume is 100 ml
Answers
The normality of the remaining H+ ions is 0.1 N.
To find the normality of the remaining H+ ions after mixing NaOH and HCl, we can use the concept of normality equivalence. Since an acid and base react in a neutralization reaction, the number of equivalents of acid (HCl) and base (NaOH) must be equal:
Equivalents of HCl = Equivalents of NaOH
To calculate the equivalents, use the formula:
Equivalents = Normality × Volume
For HCl:
Equivalents of HCl = 0.3 N × 60.0 mL = 18.0 meq
For NaOH:
Equivalents of NaOH = 0.2 N × 40.0 mL = 8.0 meq
Since the reaction goes to completion, all of the NaOH reacts with a portion of the HCl:
Remaining equivalents of HCl = 18.0 meq - 8.0 meq = 10.0 meq
Now, calculate the normality of the remaining H+ ions:
Normality = Remaining equivalents of HCl / Final volume
Normality = 10.0 meq / 100 mL = 0.1 N
So, the normality of the remaining H+ ions is 0.1 N.
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A hydrobromic acid (HBr) solution has a molar concentration of 0.055 M, Calculate the and pH of the solution. (Remember that Kw= 1.0x10-14M2.)
A) [H3O+]= 5.5x10-2M, [OH-]=1.82x10-13M, pH=1.26
B) [H3O+]= 3.8x10-13, [OH-]=2.6x10-2M, pH=12.42
C) [H3O+]= 4.8x10-3, [OH-]=1.6x10-12M, pH=9.2
D) [H3O+]= 1.0x10-8 [OH-]=1.0x10-6M, pH=8.0
E) cannot be calculated with the information given
Answers
Answer: Im not sure but i think its B
Explanation: Its hard to explain so im
not gonna do it
Taking into account the definition of strong acid, pH and pOH, it is obtained that the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26
It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). In other words, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.
Hydrobromic acid HBr is a strong acid, so a concentration of 0.055 M of the acid generates a H₃O⁺ concentration of the same value. This is:
[HBr]= [H₃O⁺]= 0.055 M= 5.5×10⁻² M
On the other hand, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically it is calculated as the negative logarithm in base 10 of the activity of hydrogen ions:
pH= -log [H₃O⁺]
Being [H₃O⁺]= 5.5×10⁻² M, the pH in this case is:
pH= -log (5.5×10⁻² M)
Solving:
pH= 1.26
Similarly, pOH is defined as the negative base 10 logarithm of the activity of the OH⁻ ions:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
Then, being pH = 1.26, the pOH is calculated by:
1.26 + pOH= 14
pOH= 14 - 1.26
pOH= 12.74
Replacing in the definition of pOH:
12.74= - log [OH⁻]
and solving you get:
[OH⁻]= 1.82×10⁻¹³ M
Finally, the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26
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Balance the following chemical equation:
As4S6+
02
->
As406+
SO2
What the answer
Answers
How are force, mass, and inertia related? A. An object that requires a larger force to accelerate has a greater mass and a greater inertia. B. An object that requires a larger force to accelerate has a smaller mass and a greater inertia. C. An object that requires a smaller force to accelerate has a smaller mass and a greater inertia. D. An object that requires a smaller force to accelerate has a greater mass and a greater inertia.
Answers
An object that requires a larger force to accelerate has a greater mass and greater inertia. Hence, option A is correct.
What is inertia?A property of matter by which it remains at rest or in motion in the same straight line unless acted upon by some external force.
The more mass found in an object, the more inertia it contains and therefore the greater its tendency to resist change.
That is precisely why applying a net force on two objects of different masses will cause the lighter mass to accelerate more than the object that has a higher mass.
An object that requires a larger force to accelerate has a greater mass and greater inertia. Hence, option A is correct.
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Answer: The answer is A
Explanation:
An object that requires a larger force to accelerate has a larger amass and a greater inertia
How much water is needed to make 7.2moles of glucose?\(6CO2 + 6H2O -\ \textgreater \ C6H12O6 + 6O2\)
Answers
Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
The balanced equation provided is:
6CO2 + 6H2O -> C6H12O6 + 6O2
From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.
The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:
(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)
Solving for x, we can cross-multiply:
6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose
43.2 moles H2O = x moles H2O
Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.
To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:
Mass of water = moles of water * molar mass of water
Mass of water = 43.2 moles * 18 g/mol
Mass of water = 777.6 g
Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
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what is the mass in kilograms of 25L of hydrophosphoric acid?
Answers
Answer:
0.0345kg is the mass of 25L of the sample
Explanation:
Hydrophosphoric acid, H₃P = Phosphine has a density of 1.38g/L.
To solve this question we need to convert the volume of the gas to mass in grams as first and then to kilograms as follows:
Mass in grams:
25L * (1.38g / L) = 34.5g
Mass in kilograms:
34.5g * (1kg / 1000g) = 0.0345kg is the mass of 25L of the sample
Which of the following properties is a common property of acids?
a) pH values < 7
b) insoluble in water
c) does not conduct electricity
d) does not react with metals
Answers
The correct answer is a) pH values < 7. Acids are substances that donate hydrogen ions (H+) when dissolved in water, which increases the concentration of H+ ions in the solution.
This excess of H+ ions causes the pH of the solution to decrease below 7, which is considered neutral. Therefore, solutions with pH values below 7 are acidic, while solutions with pH values above 7 are basic or alkaline.
Insolubility, lack of conductivity, and lack of reactivity with metals are not properties common to all acids. Some acids can be soluble in water, conduct electricity, or react with metals, depending on their specific chemical properties.
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Which two events will happen if more H2 and N2 are added to this reaction after it reaches equilibrium?
3H2 + N2 to 2NH3
Answers
If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)
1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).
2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.
It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).
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Which of the following is the correct way to do it for 3753 Scientific notation
Answers
Answer:
b
Explanation:
it is b because it has 4 spots and that would be 3 zeros so it is to the 3rd power
Elements that are shiny and are good conductors of electricity are:
a. Non-metals
b Metals
c. Halogens
d. Compounds
Answers
Answer:
Metals
Explanation:
What is an ionic solid?
A. A crystalline solid held together by a shared electron pool
B. A crystalline solid held together by dipole-dipole forces
C. A crystalline olid held together by covalent bonds
D. A crystalline solid held together by charge attractions
Answers
Answer:
D
Explanation:
An ionic solid is a crystalline solid held together by charge attractionsAn example is a salt crystal (Na⁺ + Cl⁻ → NaCl)An ionic solid is a crystalline solid held together by charge attractions or an ionic bond.
What is an ionic bond?
Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are good conductors of heat and electricity. They have high melting points. These compounds are brittle.
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Salt is considered to be an ionic substance, while sugar is commonly thought of as a
covalent (or molecular) substance. Keeping that in mind, if you were given 2
unidentified white crystals and asked to classify them as either ionic or covalent in
nature, what steps would you take and what evidence would you look for?
Answers
To classify two white crystals as either ionic or covalent in nature, you could perform a series of tests and observations to gather evidence and make a determination.
what are the steps that are followed ?
Solubility: Ionic substances tend to dissolve readily in water, forming a clear solution, while covalent substances are often insoluble in water and form a cloudy solution. You could dissolve a small amount of each crystal in water and observe the solution.
Conductivity: Ionic substances are good conductors of electricity in aqueous solution, while covalent substances are poor conductors. You could measure the conductivity of the solutions from step 1.
Melting and boiling points: Ionic substances have high melting and boiling points due to the strong electrostatic forces between ions, while covalent substances have lower melting and boiling points due to weaker intermolecular forces. You could measure the melting and boiling points of the crystals.
Crystal structure: Ionic substances form a crystal lattice structure due to the repeating arrangement of ions, while covalent substances often have a more random molecular arrangement. You could observe the crystal structure of the substances under a microscope.
By performing these tests and observations, you should be able to gather enough evidence to classify the two white crystals as either ionic or covalent in nature.
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Gases are most ideal at high temperature and low pressure. (T/F)
Answers
Answer:
true
Explanation:
Members in the same family have similar chemical properties because they all
2 points
Have the same atomic radius
Have the same # of protons
Have the same # of valence electrons
Have the same # of core electrons
The number of electrons in the outermost shell of the Sodium (Na) atom is (aka valence electrons) (Hint: check the “A” group # on your Periodic Table)
2 points
6
2
1
4
Answers
Answer:
68 plys 83
Explanation:
The true structure of a resonance hybrid is the structure of the most stable resonance contributor. Equivalent resonance forms contribute equally to the overall structure of a resonance hybrid.
Answers
The true structure of a resonance hybrid is determined by the most stable resonance contributor. Equivalent resonance forms contribute equally to the overall structure of the resonance hybrid.
In a resonance hybrid, molecules or ions can have multiple resonance structures, which are different representations of electron distribution. These resonance structures are connected by double-headed arrows to indicate the delocalization of electrons. The true structure of a resonance hybrid is not any single resonance structure but a combination of all resonance contributors.
The stability of a resonance contributor depends on factors such as formal charges, electronegativity, and resonance energy. The most stable resonance contributor, also known as the major contributor, has the lowest energy and contributes the most to the overall structure of the resonance hybrid.
Equivalent resonance forms have the same energy and contribute equally to the resonance hybrid. They can be interconverted through resonance, where electrons are delocalized over multiple atoms. This delocalization of electrons enhances the stability of the system.
By considering the most stable resonance contributor and the equal contribution of equivalent resonance forms, we can determine the true structure of a resonance hybrid, which represents the actual electron distribution in the molecule or ion.
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People can obtain groundwater by drilling a well
Answers
Answer:
yes this is I think a true statement
Fill in the blanks
The _____________ _____________ is the atomic mass rounded to a whole number.
Answers
The mass number is the atomic mass rounded to a whole number.
What is mass number?The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons as well as neutrons in an atomic nucleus however if it is approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.
It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.
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When measuring the volume of a liquid, why is it best to use a measuring container that is narrow?
Answers
Answer:
n the sciences, the “tools” for measuring the volumes of liquids are generally made from glass, plastic or occasionally metal, although professionals referred to all of them as “glassware.” Scientists, and chemists in particular, have a variety of glassware at their disposal for measuring volumes. The particular piece of glassware chosen in any situation will depend primarily upon two factors: the required volume and the accuracy required for the measurement.
Explanation:
Hope this helps leave a heart c:
Which of the following regulates food labels? HACCP FSIS FDA EPA
Answers
Answer:
FDA
Explanation:
Answer:
FDA
Explanation: it right ;)
URGENT:
Do you switch charges for ionic or covalent bonds when naming them?
Answers
Answer:
ionic
Explanation:
Would having a strong metallic stability make a metal more or less likely to corrode?
Answers
Having strong metallic stability makes a metal less likely to corrode.
What should you know about metallic stability?A metal's reactivity happens because of its location in the reactivity series or the electrochemical series.
Lower in the series metals are more stable and less likely to corrode, whereas, metals tht are higher in the series metals are more reactive and more prone to corrosion.
Gold and platinum are seen as very stable metals and are resistant to corrosion. This is because they are lower in the series of metals.
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How are the vapor pressure and boiling point of alkynes affected as the chain length increases?
Answers
Answer:
Answer to the following question is as follows;
Explanation:
Alkynes' vapour pressure and normal boiling points are altered when chain length grows, since vapour pressure rises while boiling point falls.
Vapour pressure always include pressure entered by vapour with its condensed phase, pressure include molecules force of attraction include vapour
From the following list, select all the reducing agents that are commonly used in organic reactions.
Answers
H₂ with a metal catalyst, NaBH₄, and Na in NH₃ (l) are the common reducing agents in organic reactions.
What are reducing agents?In a chemical process, a reducing agent, also known as a reductant, loses electrons and is oxidized. The electron donor is a reducing substance, which is normally in one of its lower oxidation states. A reducing substance undergoes oxidation because of the redox reaction's electron loss.
Most common reducing agents in organic reactions are sodium borohydride (NaBH4), lithium aluminum hydride (LiAlH4), and diisobutyl aluminum hydride (DIBAH), H₂ with a metal catalyst, Na in NH₃ (l).
I understand the question you are looking for is this:
From the following list, select all the reducing agents that are commonly used in organic reactions.
A. NaNH2
B. CrO3 in acid
C. H2 with a metal catalyst
D. NaBH4
E. Na in NH3 (l)
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