Answer:
B
Explanation:
Which of the following units would be best for measuring the mass of a penny?
A. Grams
B. Kilograms
C. Milligrams
D. Centigrams
Answer:
Grams
Explanation:
The mass of a penny is closer to the mass of a grape than to the mass of a book. So, use grams to measure the mass of a penny.
How much heat is required to melt 42.0 grams of water at 0*C?
Hurry...
Answer:
Heat required to melt 42 g if ice is 13,860 J
Explanation:
The amount of heat required to melt grams of water at 0°C is given as follows;
The mass of the ice (water), m = 42 g
The latent heat of fusion of ice Δ[tex]H_f[/tex]= 330 J/g
Therefore, heat required to melt 42 grams is given as follows;
Heat required to melt ice = Mass of the ice, m × The specific latent heat of fusion of the ice, Δ[tex]H_f[/tex]
Heat required to melt 42 g if ice = m × Δ[tex]H_f[/tex] = 42 g × 330 J/g = 13,860 J
Heat required to melt 42 g if ice = 13,860 J.
What is the main difference between gases and liquids
Answer:
1.Liquids have less force of attraction between molecules than solids and more than gases; gases have a very weak force of attraction between the molecules which is the least amongst the three states of matter. 2.Liquids have definite volume; gases do not have definite volume.
Explanation:
:) HOPE THIS HELPS
Answer:
particles
Explanation:
particles are buzzing around very quickly when in a gas, but when in a liquid they vibrate.
A sodium atom has 11 protons, 10 electrons, and 12 neutrons. What is its charge
Answer:
An ion with 11 protons, 11 neutrons, and 10 electrons would have a charge of 1+, also expressed as a charge of positive one or +1.
Jakasia needed to find the volume of a plastic container in L to see if the 170 L of
solution that she had would fit inside. She knew that one side was 2.5 ft, the
height of the box was 60 cm, and width of the box was 0.8 m. Use dimensional
analysis to determine if Jakasia's solution will fit in the container.
Answer:
The solution will fit into the container.
Explanation:
The following data were obtained from the question'
Volume of solution = 170 L
Length of container (L) = 2.5 ft
Height of container (H) = 60 cm
Width of container (W) = 0.8 m
Volume of container (V) =?
Next, we shall express the length, height and breadth I the same unit of measurement. In this case, we shall all in centimetres (cm).
For the length:
1 ft = 30.48 cm
Therefore,
2.5 ft = 2.5 ft × 30.48 cm / 1 ft
2.5 ft = 76.2 cm
Thus the length is 76.2 cm
For the width:
1 m = 100 cm
Therefore,
0.8 m = 0.8 m × 100 cm / 1 m
0.8 m = 80 cm
Thus, the width of the container is 80 cm.
Next, we shall determine the volume of the container as follow:
ength of container (L) = 76. 2 cm
Height of container (H) = 60 cm
Width of container (W) = 80 cm
Volume of container (V) =?
Volume = length × width × height
Volume = 76.2 × 80 × 60
Volume = 365760 cm³
Finally, we shall convert 365760 cm³ to litre (L). This can be obtained as follow:
1000 cm³ = 1 L
Therefore,
365760 cm³ = 365760 cm³ × 1 L/ 1000 cm³
365760 cm³ = 365.76 L
Therefore, the volume of the container is 365.76 L
Since the volume of the container (i.e 365.76 L) is bigger than the volume of the solution (i.e 170 L), therefore, the solution will fit into the container.
What is the temperature 128 K expressed in degrees Fahrenheit (just the number with two decimal places)?
Answer:
-229.27°
Explanation:
(128K − 273.15) × 9/5 + 32 = -229.3°F
which of these is a balanced chemical equation
Answer:
C
Explanation:
Answer:
C
Explanation:
Balanced equations have the same number of atoms of each element on both sides of the equation (right and left side of the arrow).
First count the number of atoms of each element of the original equation.
CO(g) + O₂(g) ⟶ CO₂(g)
RHS: 1C, 3O
LHS: 1C, 2O
Balancing the O atoms,
2CO(g) + O₂(g) ⟶ 2CO₂(g)
LHS: 2C, 4O
RHS: 2C, 4O
Thus, the equation is balanced.
*General rule: balance O and H atoms last (in this case C atoms were initially balanced)
LHS= left- hand side
RHS= right- hand side
A) Incorrect as there are 3 O atoms on the LHS and only 2 O atoms on the RHS.
B) Incorrect as there is 1 C atom on the LHS and 2 C atoms on the RHS. Also, on the LHS there is 3 O atoms while there is 4 O atoms on the RHS.
D) Incorrect.
LHS: 2C, 6O
RHS: 2C, 4O
Draw a structural formula for the alkene you would use to prepare the alcohol shown by hydroboration/oxidation.
Answer:
See explanation
Explanation:
The question is incomplete because the image of the alcohol is missing. However, I will try give you a general picture of the reaction known as hydroboration of alkenes.
This reaction occurs in two steps. In the first step, -BH2 and H add to the same face of the double bond (syn addition).
In the second step, alkaline hydrogen peroxide is added and the alcohol is formed.
Note that the BH2 and H adds to the two atoms of the double bond. The final product of the reaction appears as if water was added to the original alkene following an anti-Markovnikov mechanism.
Steric hindrance is known to play a major role in this reaction as good yield of the anti-Markovnikov like product is obtained with alkenes having one of the carbon atoms of the double bond significantly hindered.
What is 8S8
In need for a quick answer
Answer:
8x8 Inc. is a provider of Voice over IP products. 8x8 products include cloud-based voice, contact center, video, mobile and unified communications for businesses.
Explanation:
How many grams are in 5.90 moles of C8H18?
Mass =672.6 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
MW = molecular weight
MW C₈H₁₈ = 8x12 + 18 x1 = 114 g/mol
mass:
[tex]\tt mass=mol\times MW\\\\mass=5.9\times 114=672.6~g[/tex]
How is calculating a weighted average
different than calculating a non-weighted
average (like a mean average)?
Answer:
The Key difference between average vs weighted average is that simple average is nothing but simply adding up all the observation values and dividing the same by the total number of observations to calculate the average whereas weighted average is an average where each observation value will have a frequency assigned.
Explanation:
The weighted average involve the frequency of scores while the non-weighted average do not include the frequency of scores.
To calculate a non-weighted average such as a mean average, all we need to do is to sum up the scores and divide this sum by the number of scores. For a weighted average, each score must have a frequency attached to it. This frequency is called specific weight.
While the non-weighted average such as a mean average is a measure of central tendency, the weighted average tends to be biased towards the scores that have the largest frequency.
Learn more:https://brainly.com/question/14283892
On July 4, 2020, America turned 7.69 x 10^9
seconds old. On that day, how old was America
in years? (Assume 365 days in a year)
America's age = 243.85 years
Further explanationWhen converting units, list and multiply all the units until you find the unit you want
Time unit conversion
1 year = 365 days
1 day = 24 hours
1 hour = 3600 s
7.69 x 10⁹ seconds to years :
[tex]\tt =7.69\times 10^9~s\times \dfrac{1`hour}{3600~s}\times \dfrac{1~day}{24~hours}\times \dfrac{1~years}{365~days}\\\\=\dfrac{7.69\times 10^9}{3600\times 24\times 365}\\\\=\boxed{\bold{243.85~years}}[/tex]
Using the formula M=dx v, Calculate the mass of a liquid with a density of
17.5 g/mL and a volume of 7mL.
Answer:
The answer is 122.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 7 mL
density = 17.5 g/mL
We have
mass = 17.5 × 7
We have the final answer as
122.5 gHope this helps you
Please choose the best description, or definition of Faunal Succession.
principle stating that specific groups of organisms lived and died within a specific
time frame due to the ice age
principle stating that specific groups of fawns lived in a specific region and are
found in the rocks shoing fawns onl live in specific areas.
principle stating that specific layers of the earth have contain fauna of different
types showing biodiversity.
rinciple stating that specific groups of organisms have followed, or succeeded.
one another in a definite sequence through Earth history
Answer:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history
Explanation:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history describe Faunal succession because it is a principle that indicate that fossil plants and animals succeed each other in a sequential manner even if they occur in different places. Successive strata and faunas are linked together to form composite section in the Earth's history.
Answer:
the last one
Explanation:
Please help!!
What colors do acids and bases turn litmus paper?
Answer:
acid turns blue litmus red and base turns red litmus blue
Answer:
turns red or pink if it is acid and turns green if it is a base
Explanation:
litmus paper is blue
A car with a mass of 800 kg is accelerated with a force of 6000 N. If resisting forces are ignored, what is the acceleration of the car? yen
Answer:
The answer is 7.5 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{6000}{800} = \frac{60}{8} = \frac{15}{2} \\ [/tex]
We have the final answer as
7.5 m/s²Hope this helps you
Carbon-12 and Carbon-14 are elements that are isotopes of each other. What do Carbon-12 and Carbon-14 have in common
Answer: Carbon-12 and Carbon-14 both have the atomic number of 6.
Explanation: They are both isotopes of one another. This means they have different amount of neutrons, resulting in different atomic masses.
Answer:
They have the same atomic number. Carbon has the atomic number of 6 which means that all isotopes have the same proton number. However, the number of neutrons is different, thus giving different mass numbers.
Explanation:
A piece of wood that measures 2.7 cm x 5.5 cm x 3.9 cm has a mass of 84 g what is the density of the wood
The density of the wood : 1.45 g/cm³
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Volume of the wood[tex]\tt V=2.7\times 5.5\times 3.9=57.915~cm^3[/tex]
density[tex]\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{84~g}{57.915~cm^3}=\boxed{\bold{1.45`g/cm^3}}[/tex]
Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
A stable arrangement of eight valence electrons : ³⁵Cl⁻¹
Further explanationChlorine is a halogen gas, located in group 17, p block
Chlorine has an atomic number of 17 and an atomic mass of 35
Electron configuration: [Ne] 3s²3p⁵
If we look at the electron configuration, then Cl will bind 1 more electron so that the configuration is stable like Argon (atomic number 18)
So by binding this one electron, chlorine forms negative ions (anions)
³⁵Cl⁻¹
B. Cl⁻² binds 2 electrons, exceeding the octet rule
C. Cl⁺¹, releases 1 electron, remains unstable
D. Cl, the neutral form of Cl, is still unstable with a 7-electron valence configuration
How many minutes are In 3,417 seconds?
Answer:
57 minutes and 35 seconds, or 56.95
Explanation:
Answer:
56.95 minutes
Explanation:
hope it helps
hello nice ppl(ɔ◔‿◔)ɔ ♥
Answer:
Hi
Explanation:
How has your brainly experience been so far? Are you liking?
Answer:
Thx you are sooo noice
Explanation:
UwU U3U
Answer question number 3
How do combination circuits help prevent problems in circuits in a home? If it helps, think about a bedroom since all electrical work in a bedroom is on the same circuit.
Which is the balanced equation for S8 + O2 → SO2?
S8 + O16 → 8SO2
S8 + O2 → S8 + O2
S8 + O2 → S8O2
S8 + 8O2 → 8SO2
Answer:
The answer is A S8 + O16 → 8SO2
Explanation:
The balanced chemical equation is -:
S₈ + O₂-----> 8SO₂ therefore (d) is correct .
What do you mean by balanced chemical equation ?A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.
Methods to balance the chemical equation -:
The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.
The coefficients in front of the formulas to show how many molecules of that material are used or produced.
Hence , the balanced chemical equation is -:
S₈ + O₂-----> 8SO₂ ,hence option (d) is correct .
Learn more about balanced chemical equation, here:
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?
The group number tells the number of
Elements in the column
Number of valence electrons
O Number of energy levels
O Number of protons in the elements
Answer:
number of valence electrons
Explanation:
elements in the same group has same number of valence electrons
Chlorine has an atomic number of 17. How many protons are in
the nucleus of a chlorine atom?
Answer:17 protons
Explanation:
An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons.
1. State the properties of matter in the liquid state.
Answer:
Liquids take the shape of their container, they are one of the three stages in between a solid and a gas. A liquids particles are not in a fixed position like a solids, nor do they move as freely as a gas.
Sodium, an alkali metal, and chlorine, a halogen, are both in Period 3 of the periodic table. Which element has
a higher ionization energy? Explain your answer.
Answer:
Chlorine has higher ionization energy.
Explanation:
Sodium is present on left side of periodic table in period 3 while chlorine is present on right side of periodic table in period 3.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required. Thus chlorine have higher ionization energy as compared to the sodium.
Define the concept of Energy in your own words
Answer:
In general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change. The most common definition of energy is the work that a certain force (gravitational, electromagnetic, etc) can do. Due to a variety of forces, energy has many different forms (gravitational, electric, heat, etc.) that can be grouped into two major categories: kinetic energy and potential energy. According to this definition, energy has the same units as work; a force applied through a distance. The SI unit of energy, the joule, equals one newton applied through one meter, for example. Energy has no direction in space, and is therefore considered a scalar quantity. Energy is a conserved quantity, meaning that it cannot be created or destroyed, but only converted from one form into another. Thus, the total energy of the universe always remains constant. One form of energy can be readily transformed into another; for instance, a battery converts chemical energy into electrical energy.
Explanation:
Methane (CH4) combines with oxygen gas (O2) to form carbon dioxide
(CO2) and water (H20). Describe the number and type of atoms for a
molecule of each substance.
Explanation:
this is the balanced equation
