Answer:
C) NaCl
Explanation:
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl
This because it is an ionic compound.
Ionic compounds are formed via the electrostatic attraction between oppositely charged ions. Ionic substances have high melting point as solids and as liquids, they have a high boiling point. In aqueous solutions or in molten form, ionic compounds can conduct an electric current using free mobile ions as carriers. In solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity.Compounds like NaCl, MgO, NaF are in this category.
The hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
ElectrolytesElectrolytes are substances which conduct electricity when in the molten or solution state.
Properties of Electrolytes.They are solids with high melting pointsThey conduct electricity in the molten or solution state. Thus they were poor conductors in the solid state.They are usually acids, salts or bases.Examples are NaCl, KCl, HCl, KOH, etc.Ionic compoundsIonic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces. Ionic compounds all are electrolytes .
Properties of Ionic compounds They are solids with high melting points They are crystalline in nature They conduct electricity. Examples are NaCl, KCl, etc.Therefore, the hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
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in rutherford's gold foil experiment a very small number of alpha particles were deflected. what about the structure of the atoms that could have caused this?
Answer:The atom being mostly empty space. A small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil. There is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charge
Energy due to the position of an object is called
A. potential energy
B. conditional energy
C. kinetic energy
D. nuclear energy
Which description best characterizes the motion of particles in a solid?
a. slow but able to move past one another
b. fast and widely spaced
c.not moving
d.vibrating around fixed positions
Answer:
Explanation:
Slow but able to move past one another
2) The respiratory and digestive system work together to help the body
function efficiently. What is ONE way in which the two body systems
work together?
A)
The respiratory and digestive systems work together
to provide nutrients to tissues.
B)
The respiratory and digestive systems work together
to rid the body of carbon dioxide.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
The respiratory and digestive systems work together
to make enzymes for the breakdown of nutrients,
D)
A is the correct answer
Answer:
The correct option is C.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
Explanation:
DIGESTIVE SYSTEM is the System the body that help to breakdown compound molecules into smaller pieces that can easily by absorbed by the body hence release nutrients and ATP. Energy are stored as glucose and resuable as ATP.
RESPIRATION is a process whereby oxygen is inhaled and it help to breakdown large compounds to release energy (ATP) and carbon dioxide is released. Both system work together to release ATP for cells.
Therefore , The respiratory and digestive systems work together
to make usable ATP energy for cells. Is the correct option.
Igneous intrusion D is younger than layers B, C, and E according to
Law of superposition
Law of cross-cutting relationships
Original horizontality
Uniformitarianism
Answer:
Law of cross-cutting relationships
Explanation:
This interpretation is based on the law of cross - cutting relationships.
This law states that "faults and fractures that cuts through a rock are younger than the rocks they cut through".
In a sequence of strata, the strata that are not cut through by these features are younger than the cross -cutting features. The igneous intrusion is younger since it cuts through the rock layers.Which term is the rate at which work is done
Answer: power
Answer:
Power
Explantaion:
You said it yourself...
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer
The question is incomplete, the complete question is
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer? Ag^+ + 1 e^- rightarrow Ag Edegree = 0.7993 V V^2+ + 2e^- right arrow V E degree =-1.125 V Ag+ is reduced V is oxidized 1.924 V V2^+ is reduced Ag is oxidized I and II III, IV, and V I, II, and III III only IV and V
Answer:
only IV and V
Explanation:
If we look at the values of reduction potential for the two species, we will discover that vanadium has a negative reduction potential indicating its tendency towards oxidation.
On the other hand, solve has a positive reduction potential indicating a tendency towards reduction.
This implies that vanadium must be oxidized and silver reduced and not the not her way ground? Hence the answer above.
Choose the mole ratio below that is INCORRECT based on the given balanced equation:
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
O 2 moles C2H5OH = 4 moles CO2
O 7 moles O2 = 2 moles C2H5OH
O 4 moles CO2 = 4 moles O2
O 6 moles H2O = 7 moles O2
Answer:
4 moles CO₂ = 4 moles O₂
Explanation:
The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.
Let us write the reaction equation:
2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O
To write mole ratios in a chemical reaction, we must ensure the equation is balanced.
Since the given expression is balanced,
Then 4 moles CO₂ = 4 moles O₂ is not correct;
Rather;
4 moles CO₂ = 7 moles O₂ is the right expression
What is the atomic mass for cl
Answer:
Chlorine's (Cl) atomic mass if 17.
Explanation:
"Chlorine (atomic number 17) is a yellowish-green toxic gas. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37."
What is the predominant intermolecular force in the liquid state of each of these compounds: hydrogen fluoride (HF), carbon tetrabromide (CBr4), and nitrogen trifluoride (NF3)? Force(s): Dipole-dipole Hydrogen Bonding Dispersion
Answer:
HF - hydrogen bonding
CBr4 - Dispersion
NF3 - Dipole-dipole
Explanation:
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc. Hence the dominant intermolecular force in HF is hydrogen bonding.
CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments cancel out leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.
NF3 has a resultant dipole moment hence the molecules are held together by dipole-dipole interaction.
The predominant intermolecular force in the liquid state of the compounds are as follows:
HF - hydrogen bondingHF - hydrogen bondingCBr4 - DispersionHF - hydrogen bondingCBr4 - DispersionNF3 - Dipole-dipoleDiscussion:
Hydrogen bonding is a bonding characterized covalent bonding of hydrogen to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc.In essence, the dominant intermolecular force in HF is hydrogen bonding.
Carbon tetrabromide, CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments neutralise leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.Nitrogen trifluoride, NF3 has its molecules held together by dipole-dipole interaction as a result of its resultant dipole moment.Read more:
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If I wanted to convert from nanograms to centigrams which directions would I move my decimal?
Right or Left
Answer:
Left
Explanation:
To convert from Nanograms to centigrams, you have to move the decimal to the left hand side.
1 nanograms = 1 x 10⁻⁹g
1 centigrams = 1 x 10⁻² g
So to convert from nanograms to centigrams,
Multiply by 1 x 10⁻⁷ or move 7 places to the left
What does Le Châtelier's principle state?
How much of glucose (C6H1206) is needed to make 1 L of a 1-M solution? Use details to support your answer.
Answer:
200 g C₆H₁₂O₆
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
1 M C₆H₁₂O₆
1 L of solution
Step 2: Identify Conversions
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar mass of C₆H₁₂O₆ - 6(12.01) + 12(1.01) + 6(16.00) = 180.18 g/mol
Step 3: Find moles of solute
1 M C₆H₁₂O₆ = x mol C₆H₁₂O₆ / 1 L
x = 1 mol C₆H₁₂O₆
Step 4: Convert
[tex]1 \ mol \ C_6H_{12}O_6(\frac{180.18 \ g \ C_6H_{12}O_6}{1 \ mol \ C_6H_{12}O_6} )[/tex] = 180.18 g C₆H₁₂O₆
Step 5: Check
We are given 1 sig figs. Follow sig fig rules and round.
180.18 g C₆H₁₂O₆ ≈ 200 g C₆H₁₂O₆
A bottle with a mass of 6.8 g has 23.1 mL of a liquid placed in it. The combined mass of the bottle and the liquid is now 48.8 g. Find the density of the liquid. Give the correct number of significant figures in the answer according to the rule.
Answer:
d = 1.8 g/mL
Explanation:
Given data:
Mass of bottle = 6.8 g
Volume of liquid = 23.1 mL
Mass of bottle + liquid = 48.8 g
Density of liquid = ?
Solution:
First of all we will calculate the mass of liquid.
Mass of liquid = combined mass - mass of bottle
Mass of liquid = 48.8 g - 6.8 g
Mass of liquid = 42 g
Density of liquid:
d = m/v
d = 42 g/ 23.1 mL
d = 1.8 g/mL
What is the frequency of a photon that has a wavelength of 754 um?
Answer:
0.39760273
Explanation:
I typed into calculator hope it's right.
HELPPP FAST
a. list the following from the smallest atomic size to the largest atomic size.
aluminum, chlorine, magnesium, sodium
sodium
magnesium
aluminum
chlorine
Similar cells with the same function, all working together for the same purpose, form the 2nd level of organization in an organism. This level is called a(n)
Answer:
tissue
Explanation:
cell→tissue→organ→systems→organism
What is the current in a 160V circuit if the resistance is 5Ω?
Answer:
use v=IR
Explanation:
so, 160=I*5
I = 160/5
=32 ampere
The current = 32 A
Further explanationElectric current is a ratio between the voltage and the amount of resistance at the conductor.
Can be formulated
[tex]\large{\boxed{\bold{I=\frac{V}{R}}}[/tex]
V = Voltage (volts)
R = resistance (ohms)
This formula is also known as Ohm's Law, which states that
the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.
V=160 V
R=5Ω
[tex]\tt I=\dfrac{160}{5}=32~A[/tex]
If 20.00 moles of KClO3 react, how many molecules of O2 will form?
Answer:
30
Explanation:
20 KClO³ —> 30 O² +.....
When solving by using the Quadratic Formula, what are the steps to follow? a. factor, find values for a,b,c, subtract c. substitute into the formula, find values for a,b,c, simplify b. simplify, find values for a,b,c, factor d. find values for a,b,c, substitute into the formula, simplify
Answer:
D!
Explanation:
When solving by using the Quadratic Formula, The steps to follow are to find values for a, b, c, substitute them into the formula, and simplify. The correct option is d.
What are Quadratic Formulas?A quadratic equation is a mathematical equation that shows the equation in an arranged form in which the unknown variables are x and known variables are a, b, and c. Where a is not equal to 0.
The standard quadratic equation
ax² + bx + c = 0
To solve the quadratic equation, first, find the variable value, and substitute the value of a, b, and c. Simplify it and ans solve it and then get the solution. There is another thing in the quadratic equation, which is factorization.
Thus, the correct option is d. find values for a, b, c, substitute them into the formula, and simplify.
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Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Electrical energy can produce many other types of energy.
When electricity runs through the speaker of a stereo, what other types of energy are produced?
A. sound energy
B. energy of motion
C. chemical energy
D. light energy
which word or words best describe Haversian systems?LigamentLigamentBone Bone marrowmarrowCircular Circular structuresstructuresCartilageCartilage
sodium will do an ionic with
1. bromine
2. magnesium
3. potassium
4. element in group 2
In UV region measurements, the üsed cell must be Oa. Plastic cell O b. KBr cell C. Fused silica cell d. Glass cell
Answer:
i think it is d Glass cell
Explanation:
wich of the following is hereditary materials found in human and almost all organism
I NEED THIS ASAP!!!!!!!!!!!
What describes using organisms that were only alive during a specific time period to estimate the unknown age of items?
Group of answer choices
Radioactive dating
Law of superposition
Relative dating
Index fossils
Answer:
index fossil
Explanation:
If you have a voltage of 120 volts entering your house and a light bulb with 0.625 amperes flowing through it, how many watts is your light bulb?
Plzzzz help right answer gets a Brainly!
Answer:
75 watts
Explanation:
if you perfom 30 joules of work lifting a 20-N box from the floor to a shelf how high is the shelf
Answer: 1.5 m
Explanation: E=mgh=Fh
30 J = 20 N * h
h = 30/20 = 1.5 m
Answer:
1.5 m
Explanation:
it just is its easy made A on test
⦁ Which of the following has the greatest Fe content: FeS, Fe2(SO4)3, or FeCl2? Complete calculations must be shown to support your choice. (
Answer:
Fe2(SO4)3 has the greater iron content.
Explanation:
Hello!
In this case, considering the content of a specific element in a compound, we must take into account the subscript is has in the formula, for instance FeS has one iron atom, Fe2(SO4)3 has two iron atoms and FeCl2 has one iron atom; thus, by assuming one mole of each compound, we can compute the moles of iron there:
[tex]n_{Fe}^{FeS}=1molFeS*\frac{1molFe}{1molFeS}=1molFe \\\\n_{Fe}^{Fe_2(SO_4)_3}=1molFe_2(SO_4)_3*\frac{2molFe}{1molFe_2(SO_4)_3}=2molFe\\\\n_{Fe}^{FeCl_2}=1molFeCl_2*\frac{1molFe}{1molFeCl_2}=1molFe[/tex]
It means that Fe2(SO4)3 would have the greatest iron content.
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