Answer:
A
Explanation:
rest are nonmetals and they are not shiny
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.
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
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
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.
Sodium + oxygen
What colour is the flame produces
Answer:
Orange
Explanation:
I used google my b
Answer:
ORANGE
explanation:
Small pieces of sodium burn in air with often little more than an orange glow. Using larger amounts of sodium or burning it in oxygen gives a strong orange flame.
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
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.
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
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.
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:
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.
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
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]
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.
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:
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
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
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
?
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
What element would have this electron configuration:
1s22s22p5
HELP ME OUT PLEASE!! I NEED HELP !
This diagram represents one of the four levels of industry. Which term best
completes the diagram?
Factory employees
Oil refinery workers
Butchers
A. Quaternary sector
OB. Secondary sector
C. Tertiary sector
D. Primary sector
Answer: OB. Secondary Sectors.
Explanation: Make sure to study as the text provided, and study guide state manufacturers, butchers, and factory employees are apart of the secondary sector in the world economy. You’ll do great on Quiz 3.2.5! Make sure to study, have a g’day. Please don’t listen to people who say this answer is falsen as many other questions do, don’t be the one to spread false information as this people’s academics, here’s a picture as well ❤︎. Again, its B!
1. What is the charge of an oxide ion?
O
2+
3+
2-
оо
3-
Answer:
2+
Explanation:
An oxide ion is diatomic
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]
Calculate the molarity of 0.207 grams of Ca(OH)2 in an aqueous solution with a total volume of 40.0 mL
Answer:
40.0 mL. (4 marks)...
Explanation:
Which is the best way to determine if an object is made of pure silver?
O Determine the solubility of the object.
O Test to see if the object is chemically reactive.
Determine the density of the object and compare the known density of pure silver.
O Compare the mass of the silver object to the mass of a piece of pure silver.
Answer:
The correct option is;
Determine the density of the object and compare the known density of pure Silver
Explanation:
The density of the object is found by finding the weight of the object, and then finding the volume (of water) the object displaces when it is immersed (in water)
The density is then fond by dividing the weighed mass by the volume the object displaces when immersed
Compare the result of the measured density with that of pure silver. If the two have density, as well as other similar physical characteristics, then the object is likely to be pure silver.
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
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
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.
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:
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.
