Answer:
26.7°C
Explanation:
Using the formula; Q = m × c × ΔT
Where; Q = amount of heat
m = mass
c = specific heat
ΔT = change in temperature
In this question involving iron placed into water, the Qwater = Qiron
For water; m= 50g, c = 4.18 J/g°C, Initial temp= 25°C, final temp=?
For iron; m = 30.5g, c = 0.449J/g°C, Initial temp= 52.7°C, final temp=?
Qwater = -(Qiron)
m × c × ΔT (water) =- {m × c × ΔT (iron)}
50 × 4.18 × (T - 25) = - {30.5 × 0.449 × (T - 52.7)}
209 (T - 25) = - {13.6945 (T - 52.7)}
209T - 5225 = -13.6945T + 721.7
209T + 13.6945T = 5225 + 721.7
222.6945T = 5946.7
T = 5946.7/222.6945
T = 26.7
Hence, the final temperature of water and iron is 26.7°C
Use the information below to explain why the atomic radius decreases down a group.
Answer:
Detail is given below
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
In A we can see that there is one positive charge and force of attraction is 2.30×10⁻⁸ N and distance is 0.10 nm
In B we can see that negative charge is further away from nucleus because of greater distance thus force of attraction will be less. 0.58×10⁻⁸ N
In C this distance further increases and force also goes in decreasing 0.26×10⁻⁸ N.
Which surface will most likely cause a rolling ball to slow down?A.grassB.iceC.tile
Answer:
grass
Explanation:
ice and tile are smooth and without any bumps or large ridges, unlike grass which is spiky and flexible. grass will most likely slow down a ball that is rolling, unlike answer choices B and C.
Answer:
grass
Explanation:
ice and tile are bothe a flat surface where grass has texture
What is NOT an example of evidence of a super continent?
Question 5 options:
Fossil Record
Continuous Chain
Ocean Currents
Climate
A supercontinent is a landmass that consists of an aggregate mass of entire earth lithospheric landmasses. Pangaea was the last supercontinent that split about 200 million years ago.
The German geologist Alfred Wegener gave numerous pieces of evidence to support his theory of continental drift. These theories include fossil records, glacial chains, coal despites. In some places, he has also mentioned the presence of a similar climate type.Hence the option C is correct.
Learn more about the not an example of evidence of a supercontinent.
brainly.com/question/25322191.
Is this a compound,mixture or solution? (10 points)
Answer:
it is a compound it is a solution when they say they are ablle to seperate it give out they did not mix it
Explanation:
How do I write the following :
One atom of Nitrogen
Five atoms of Nitrogen
One molecule of Nitrogen
Five molecules of Nitrogen
One molecule of Sulfur
One atom of Sulfur
Eight molecules of Sulfur
Answer:
Five molecules of nitrogen and eight molecules of sulfur
Explanation:
Determine what elements are denoted by the following electron configurations:
1s22s22p63s23p4s23d104p65s1
Answer:
Electron Configurations - Solutions
Note: The electron configurations in this worksheet assume that lanthanum (La)
is the first element in the 4f block and that actinium (Ac) is the first element in the
5f block. If your periodic table doesn’t agree with this, your answers for elements
near the f-orbitals may be slightly different.
1) sodium 1s2
2s2
2p6
3s1
2) iron 1s2
2s2
2p6
3s2
3p6
4s2
3d6
3) bromine 1s2
2s2
2p6
3s2
3p6
4s2
3d104p5
4) barium 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s2
4d105p6
6s2
5) neptunium 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s2
4d105p6
6s2
4f145d106p6
7s2
5f5
6) cobalt [Ar] 4s2
3d7
7) silver [Kr] 5s2
4d9
8) tellurium [Kr] 5s2
4d105p4
9) radium [Rn] 7s2
10) lawrencium [Rn] 7s2
5f146d1
11) 1s2
2s2
2p6
3s2
3p4
sulfur
12) 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s1
rubidium
13) [Kr] 5s2
4d105p3
antimony
14) [Xe] 6s2
4f145d6
osmium
15) [Rn] 7s2
5f11 einsteinium
16) 1s2
2s2
2p6
3s2
3p6
4s2
4d104p5 not valid (take a look at “4d”)
17) 1s2
2s2
2p6
3s3
3d5
not valid (3p comes after 3s)
18) [Ra] 7s2
5f8
not valid (radium isn’t a noble gas)
19) [Kr] 5s2
4d105p5 valid
20) [Xe] not valid (an element can’t be its own electron configuration)
Draw arrows for all of the attractive and repulsive forces between the negatively charged electrons and positively charged protons in these atoms. Make sure your arrows clearly show the difference between attractive and repulsive forces. Note that the particles without a charge label are neutral.
Answer:
Attraction
(e-) ---> <--- (H+)
Repulsion:
<---(e-) (e-)-->
Neutral:
(e-) (Helium)
Explanation:
Accordingly to coulomb's law:
In the attraction, the hydrogen without an electron has a positive charge and needs to be fulfilled with a negative charge found in an eletron.
In the repulsion, both electrons has the same charge and repulse each other.
In the neutral case, the Helium is highly stable therefore the electron is not attracted.
which two is it if u get it correct u get brainlist
Answer:
The answer is D and B
Explanation:
It is a quanity because it is because it is being measured in terms of numerical information.
Its is also continuous beause it does not show random change in the mathmatics, it it a slow yet constant change of measurement.
What is the darkest layer of soil at the top of the photograph called?
A. Aggregate
B. Subsoil
C. Bedrock
D. Topsoil
Answer: D.)Topsoil
Explanation: Have agriculture
4. A 100.0 mL sample of 0.2516 M aqueous barium chloride was treated with an excess of sulfuric acid. The
resulting barium sulfate precipitate was filtered, dried, and found to have a mass of 4.9852 g. Compute the
percentage yield of barium sulfate in this process.
365,000,000 scientific notation
What is the Scientific
Method?
Answer:
I just finished a unit on Scientific Method in my science class! Anyway, it's defined in the screenshots below. Hope this helps!
what is a group that does not change and represents a normal pattern of response
Answer:
Constant
Explanation:
Trust
identify the PowerHouse of a cell
A. Golgi
B. lysosome
C. ribosomes
D. nucleus
E. mitochondrion
F. cytoplasm
G. rough endoplasmic reticulun
H. membrane
I'm not sure which category this is. But please help me on this!!
Two piles of heavy boxes must be lifted onto a shelf. Each pile has 20 boxes and each box is the same size and weight. Tom and Claudia are each responsible for a pile. Tom lifts each box straight up from the pile to the shelf. Claudia places a long, gradual ramp that leads from the pile to the shelf. She pushes each box up the ramp until it rests on the shelf.
(Tom used more force.)
Compare the distance each person moved each box. Who moved the boxes a longer distance?
Answer:
Tom
Explanation:
Simply because we see Claudia used a shortcut. Tom uses more physical force than Claudia, since Claudia only had to push the boxes into there required shelves.
Which statement best explains why heating a liquid affects its viscosity?
O The molecules move faster at higher temperatures and overcome attractions more easily.
O The molecules move faster at higher temperatures, and the attractions between them increase.
O The molecules move slower at higher temperatures and overcome attractions more easily
The molecules move slower at higher temperatures, and the attractions between them decrease.
Answer:
A
Explanation:
took test I'm pretty sure and found respond else where
Answer:
A) The molecules move faster at higher temperatures and overcome attractions more easily.
Explanation:
Edg 2020
An agronomist hypothesized that add ran intots
the growth of Bermuda grass seedlings. He
planted three samples of grass and watered each
with a different pH solution.
How did plant growth in the pH 3.1 group compare
to plant growth in the other groups?
Answer:
D
Explanation:
Answer:
1. D
2. A
Explanation:
explain all ways your atom and symbol for it would change if you removed 2 electrons from the atom
Each atom/element has an electron configuration
The electron configuration shows the energy level of the electron
Each electron configuration has 4 quantum numbers, namely n, l, ml, and ms
n = the principall = the angular momentum / azimuthal ml = the magnetic ms = the electron-spinWe make an example of the element Mg which is in group 2 with the atomic number 12
Electron configuration of Mg: [Ne] 3s² or 1s² 2s² 2p⁶ 3s²
if Mg removes 2 electrons then Mg will form a positive ion (cation) Mg²⁺
This cation is included in the monatomic ion because it is formed from one element (in contrast to the polyatomic ion, which is formed from two or more elements such as SO₄²⁻, ClO₃⁻)
Electron configuration of Mg²⁺ : 1s² 2s² 2p⁶
So atoms can be positively or negatively charged depending on removing or attracting electrons
What are two substances that are useful because of their viscosity? (Please describe why they are useful)
Answer:
The two substances are Grease and Oil.
Explanation:
- Grease is used for other lubrication outside of the engine when it is really cold.
- Oil is used for lubricating when your engine is really hot.
what is the heat of reaction H2 + 1/3N2 2/3NH3
Can someone explain cellular respiration?
Answer:
Explanation:
set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules[1
Based on the oxidation states of the atoms in this reaction, answer the questions. 4Fe(0) + 3O2(0) → 2Fe2(3+)O3(2-) How many electrons does the iron half-reaction lose? How many electrons does the oxygen half-reaction gain? What is the total number of electrons that are moved in this oxidation-reduction reaction?
Answer:
Twelve electrons
Explanation:
If we look at the product side, we will notice that iron lost twelve electrons and oxygen gained twelve electrons.
Hence, we have 4Fe^3+ and 2O3^2- showing twelve electrons lost/gained.
Answer:
How many electrons does the iron half-reaction lose?
12
How many electrons does the oxygen half-reaction gain?
12
What is the total number of electrons that are moved in this oxidation-reduction reaction? 12
Explanation:
How do you find the mass number of an isotope?
Answer:
The mass number of an isotope is the total number of protons and neutrons in an atomic nucleus. If you know that a nucleus has 6 protons and 6 neutrons, then its mass number is 12. If the nucleus has 6 protons and 7 neutrons, then its mass number is 13.
Explanation:
What is the relationship between the number of particles and the overall pressure?
When the volume of the gas is decreased, do the gas particles get smaller?
Yes or No?
Answer:
The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law). Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules
Explanation:
the neuron of the basic unit of structure and _____of the nervous system
I NEED THIS ASAP
thank you
Answer:
with out answer choices i will assume dendrites
Explanation:
hey Google please how what types of elements are crop in P block right with example
Answer:
The elements of groups 13, 14, 15, 16, 17, 18 are called p block elements.examples: boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl),and so on
Explanation:
a drop of water has a volume of about 0.05 mL. How many molecules of water are in a drop of water?
Answer:
20 drops
Explanation:
You have a graduated cylinder with 10 mL of water in it.
You add 300 g of lead weights, and the volume of the
water rises to 40 mL. What is the density of the lead?
Answer:
The answer is 10 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 300 g
volume = final volume of water - initial volume of water
volume = 40 - 10 = 30 mL
We have
[tex]density = \frac{300}{30} = \frac{30}{3} \\ [/tex]
We have the final answer as
10 g/mLHope this helps you
Express the following as a whole number or as decimals: 3.5 x 10-3 m
15 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
Questions 1 is Letters
Questions 2 is H I believe
Questions 3 is hardness
Explanation:
hope I helped
Answer:
1. c
2. a
3. b
you're welcome