most of the earth's landmasses is covered by a mixture of bits of rock and bit of once~living part of plants or animal. this material is called
and its not fossil
when a rotting log was turned over, pill bugs, termites , ants , fungi , and earthworms were living there. the termites represent ____ in its
a. an environment
b. a population
c. a niche
d. an abiotic factor
Who's the first person to reach the moon
Answer: Neil Armstrong
Explanation
On July 20, 1969, Neil Armstrong became the first human to step on the moon. He and Aldrin walked around for three hours. They did experiments. They picked up bits of moon dirt and rocksExplanation:
Answer:
In 1969, Neil Armstrong was the first person to reach the moon.
Explanation:
Aluminum oxide reacts with hydrochloric acid to produce salt. What is the name of the salt produced?
Answer:
IT IS CHLORIDE!
There is 10 green marbles and 10 blue marbles in a bag. What is the minimum number of marbles you need to pull out of the bag to be 100% sure that you have two marbles of the same color without looking at the marbles
Answer:
3
Explanation:
3 see below.
Take a much much easier problem that you might actually encounter in your life.
Suppose you have a sock drawer in your room that you haven't had the energy to put in order. Suppose you only look at that drawer when it is pitch black in the room. There are only 2 color socks in there -- red and green. How many socks to you have to pull out to assure that you have 2 of one color when you pull them out.
No cheating!
Three right. Suppose you pull out 1 green and 1 red. The next sock you pull out will have to be one of those 2 colors, right?
The Earth's early atmosphere consisted of what
Select the most reactive metal from the options below
Iron
Copper
Zinc
Gold
Answer: Hello, This is my most favorite class so I know this is right.
The most Reactive metal source is Copper.
Explanation:
This is the most reactive because it contains Lithium supplement.
Your Welcome! Mark me as Brainliest! :)
What is the name of the polyatomic ion with the molecular formula
SO32-
Answer:
sulfite ion SO32
Explanation:
A molecular ion is a covalently bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero.
Using the rules of electron configurations is this a valid orbital diagram?
A rod measuring 13.870000 x 3.640000 x 5.980000 cm was plated by means of a current of 84.780000 milliamps for 3.670000 hours. What is the thickness in millimeters of the silver deposit on the rod, given that the density of silver is 10.650000 g / cm3
Answer:
0.024 mm
Explanation:
The quantity of charge deposited Q = It where I = current = 84.780000 mA = 0.084780000 A and t = time = 3.670000 hours = 3.670000 × 3600 s = 132120000 s.
Also Q = nF where n = number of moles of electrons silver deposited and F = Faraday's constant = 96500 C/mol
So, It = nF
n = It/F = 0.084780000 A × 132120000 s/96500 C/mol = 1120.1134 C/96500 C/mol = 0.012 mol
So, we have 0.012 mol of electrons
Our chemical equation is
Ag⁺ + e⁻ → Ag
Since 1 mol of electrons deposits 1 mol of silver atoms, then, 0.012 mol of electrons deposits 0.012 mol of silver atoms.
Since number of moles of silver atoms, n' = m/M where m = mass of silver atoms deposited and M = molar mass of silver = 107.868 g/mol
So, m = n'M
since n' = 0.012 mol,
m = 0.012 mol × 107.868 g/mol = 1.294 g
Since density of silver ρ = m/V where m = mass of silver deposited = 1.294 g and V = volume of silver deposited
V = m/ρ
Since, ρ = 10.650000 g/cm³
V = 1.294 g/10.650000 g/cm3 =
V = 0.122 cm³
Since the dimensions of the measuring rod are 13.870000 x 3.640000 x 5.980000 cm which represent its length, l, width, w and height, h respectively, the volume of silver deposited V = Ah' where A = area of the rod, lw and h' = thickness of silver deposited
So, V = Ah
V = lwh'
h' = V/lw
= 0.122 cm³/13.870000 cm x 3.640000 cm
= 0.122 cm³/50.4868 cm²
= 0.0024 cm
= 0.024 mm
There are 5 moles of N20 at STP. What is the density?
Answer:
5 mole of N2O : 112 litre of N2O
5 mole of N2O : 220 g of N2O
Then,
Density = mass/ volume
= 220/112
= 1.96 g per litre
a wave transfers from one place to another
Answer:
mhm
Explanation:
help meeeeeeeeeeeeee
Answer:
XCl₂ + 2AgNO₃ —> X(NO₃)₂ + 2AgCl
The coefficients are: 1, 2, 1, 2
Explanation:
XCl₂ + AgNO₃ —> X(NO₃)₂ + AgCl
The equation can be balance as follow:
XCl₂ + AgNO₃ —> X(NO₃)₂ + AgCl
There are 2 atoms of Cl on the left side and 1 atom on the right side. It can be balance by writing 2 before AgCl as shown below:
XCl₂ + AgNO₃ —> X(NO₃)₂ + 2AgCl
There are 2 atoms of Ag on the right side and 1 atom on the left side. It can be balance by writing 2 before AgNO₃ as shown below:
XCl₂ + 2AgNO₃ —> X(NO₃)₂ + 2AgCl
Now, the equation is balanced.
The coefficients are: 1, 2, 1, 2
What is the name of this hydrocarbon?
Answer:In the given molecule the methyl group is attached at the second carbon atom of the parent chain. Therefore the name of hydrocarbon is 2-methylbutane.
Explanation:
True or False; the atomic number always equals the number of protons, neutrons and electrons found in an atom.
"" ANSWER""
Protons are values of atomic numbers that do NOT change, that is, they are located inside the nucleus of the atom, whereas electrons are located in the electrosphere that can gain or lose electrons, the electron has a negative charge and the Proton positive, that is, if in any atom it wins an electron the atom will be negative and if the atom loses it will be positive because we already know that the number of protons does not change. To calculate the number of neutron we have to make the number of rounded atomic mass which becomes mass less the number of protons for example oxygen gas has 8 protons which is the atomic number and has atomic mass 15,999 which rounding up to 16 to find the number of neutrals we do 16-8 = 8 so now we know that oxygen has: 8 protons, 8 electrons and 8 neutrons but the values will not always be the same but the possibility of protons and neutrals having the same value is 75% by my count .
● ○ ● RULES ○ ● ○ ●
Atomic number = number of protons
Atomic mass ROUNDNESS = mass
Number of neutrons = number of protons - mass number
OBSERVATION- EXPLANATION FOR STUDENTS OF 9 YEARS BECAUSE IN THE HIGH SCHOOL UP SOME CHANGES CHANGE.
■■ GOOD STUDIES ■■
Titanium is a transition metal used in many alloys because it is extremely strong and lightweight. Titanium tetrachloride (TiCl4) is extracted from titanium oxide using chlorine and coke (carbon). TiO2(s) + C(s) + 2 Cl2(g) TiCl4(s) + CO2(g) (a) What mass of Cl2 gas is needed to react with 1.60 mol TiO2? g (b) What mass of C is needed to react with 1.60 mol of TiO2? g (c) What is the mass of all the products formed by reaction with 1.60 mol of TiO2? g
Answer:
a) 226.6 grams of Cl₂
b) 19.2 grams of C
c) 303.2 grams of TiCl₄ and 70.4 grams of CO₂
Explanation:
The balanced chemical reaction is the following:
TiO₂(s) + C(s) + 2 Cl₂(g) → TiCl₄(s) + CO₂(g)
(a) What mass of Cl₂ gas is needed to react with 1.60 mol TiO₂?
From the chemical equation, 1 mol of TiO₂ reacts with 2 moles of Cl₂. So, the stoichiometric ratio is 2 mol Cl₂/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of Cl₂ we need:
1.60 mol TiO₂ x 2 mol Cl₂/1 mol TiO₂ = 3.2 mol Cl₂
Now, we convert from moles to mass by using the molecular weight (MW) of Cl₂:
MW(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol
mass of Cl₂= 3.2 mol x 70.8 g/mol = 226.6 g
Therefore, 226.6 grams of Cl₂ are needed to react with 1.6 mol of TiO₂.
(b) What mass of C is needed to react with 1.60 mol of TiO₂?
From the chemical equation, 1 mol of TiO₂ reacts with 1 moles of C(s). So, the stoichiometric ratio is 1 mol C/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of C(s) we need:
1.60 mol TiO₂ x 1 mol C(s)/1 mol TiO₂ = 1.60 mol C(s)
So, we convert the moles of C(s) to grams as follows:
MW(C) = 12 g/mol
1.60 mol x 12 g/mol = 19.2 g C(s)
Therefore, a mass of 19.2 grams of C is needed to react with 1.60 mol of TiO₂.
(c) What is the mass of all the products formed by reaction with 1.60 mol of TiO₂?
From the chemical equation, we can notice that 1 mol of TiO₂ produces 1 mol of TiCl₄ and 1 mol of CO₂. So, from 1.60 moles of TiO₂, 1 mol of each product will be produced:
1 mol TiO₂/1 mol TiCl₄ ⇒ 1.60 mol TiO₂/1.60 mol TiCl₄
1 mol TiO₂/1 mol CO₂ ⇒ 1.60 mol TiO₂/1.60 mol CO₂
Finally, we convert the moles to grams by using the molecular weight of each compound:
MW(TiCl₄) = 47.9 g/mol Ti + (35.4 g/mol x 4 Cl) = 189.5 g/mol
1.60 mol x 189.5 g/mol = 303.2 g
MW(CO₂) = 12 g/mol C + (16 g/mol x 2 O) = 44 g/mol
1.60 mol x 44 g/mol = 70.4 g
Therefore, from the reaction of 1.60 mol of TiO₂ are formed 303.2 grams of TiCl₄ and 70.4 grams of CO₂.
1 and 2 answer choice help please?
Answer:
I think its b be ause it looks like a better answer and it has some detail to it
how do i make chrystals using home suppplies
You could use sodium accetate a put it in water...
Which statement about tendons and ligaments is true?
a. Ligaments connect muscle to bone
b. Tendons connect muscle to bone
c. Ligaments connect bone to bone
d. Tendons connect bone to bone
Answer:
Option C is true to be honest
Answer:
i put c and got it wrong its b
Explanation:
Which series reveals the source of energy for coal? i will mark brainlest!!!!!!!!!!!!!!!!!!!!!!!! giving 20 points
coal chemicals sun
coal plants chemicals
coal animals sun
coal plants sun
Answer:
coal chemicals sun
Explanation:
A 25.00 mL sample of the ammonia solution
was accurately diluted to 250.0 mL. A 25.00mL
aliquot of the diluted ammonia solution was
placed in a conical flask. Indicator was then added
and the solution was titrated with 0.208 molL-1
hydrochloric acid. The indicator changed colour
permanently when 19.64 mL of the acid had been
added. Calculate the concentration of ammonia in
the original solution.
Answer:
1.634 molL-1
Explanation:
The mol ration between NH3 and HCl is 1 : 1
Using Ca Va / Cb Vb = Na / Nb where a = acid and b = base
Na = 1
Nb = 1
Ca = 0.208 molL-1
Cb = ?
Va = 19.64 mL
Vb = 25.00mL
Solving for Cb
Cb = Ca Va / Vb
Cb = 0.208 * 19.64 / 25.0
Cb = 0.1634 molL-1 (Concentration of diluted ammonia solution)
Using the dilution equation;
C1V1 = C2V2
Initial Concentration, C1 = ?
Initial Volume, V1 = 25.00 mL
Final Volume, V2 = 250 mL
Final Concentration, C2 = 0.1634 molL-1
Solving for C1;
C1 = C2 * V2 / V1
C1 = 0.1634 * 250 / 25.00
C1 = 1.634 molL-1
If you form 3.28 moles of FeCl3 in a reaction, how many moles of FeCl2 did you start with? SHOW ALL WORK Plz
Answer:
molerat
Explanation:
Answer:
3.28 mol
Explanation:
2 mol FeCl3 forms from 2mol of FeCl2
therefore 3.28 mol of FeCl3 forms from=2/2×3.28 mol=3.28 mol
two types of subatomic particles in the nucleas of an atom
Explanation:
protons and neutrons.....
...
Answer:
The subatomic particles are Protons and Neutrons.
How are beef and gas productions related to methane levels?
Plzzz answer quick
Answer:
Cows and other ruminant animals (like goats and sheep) emit methane, a potent greenhouse gas, as they digest grasses and plants. This process is called “enteric fermentation,” and it's the origin of cows' burps.
Explanation:
how many protons electrons and neutrons does the following isotopes contain 1H+
Answer:
The other name for this isotope is a proton. This is because it contains just a single proton.
Explanation:
H+
Protons = 1
Electrons = 1 - 1 = 0 (The + sign means it has lost a single electron)
Neutrons = 0
I REALLY NEED HELP HERE IM BEGGING YOU!!!
Answer:
what grade is this for and i think ik what the answer is
Explanation:
1 In what type orbital are the outer electrons of the atoms of the elements of Group 1 (IA) and Group 2 (IIA)?
Answer:
s orbital
Explanation:
The elements of Group 1 (IA) and Group 2 (IIA) have one and two electrons in their outermost shells respectively.
For the elements in group Group 1 (IA), the general outer electron configuration is ns1. This last electron is accommodated within an s orbital.
For the elements in Group 2 (IIA), the two outermost electrons are accommodated in an ns orbital, hence the answer.
Which of the following is an example of kinetic energy?
Answer: A river flowing at a certain speed
Explanation: as water has certain velocity and mass.
Crossing a Dd parent with another Dd parent results in
Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb = 5.47. Calculate the pH of a .00250 M oxycodone solution.
Answer: The pH of a 0.00250 M oxycodone solution is 9.96
Explanation:
[tex]C_{18}H_{21}NO_4\rightarrow C_{18}H_{20}NO_3^++OH^-[/tex]
cM 0 M 0 M
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\times \alpha[/tex]
So dissociation constant will be:
[tex]K_b=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
Give c= 0.00250 M and [tex]pK_b[/tex] = 5.47
[tex]pK_b=-log(K_b)[/tex]
[tex]K_b=3.38\times 10^{-6}[/tex]
Putting in the values we get:
[tex]3.38\times 10^{-6}=\frac{(0.00250\times \alpha)^2}{(0.00250-0.00250\times \alpha)}[/tex]
[tex](\alpha)=0.036[/tex]
[tex][OH^-]=c\times \alpha[/tex]
[tex][OH^-]=0.00250\times 0.0369=9\times 10^{-5}[/tex]
Also [tex]pOH=-log[OH^-][/tex]
[tex]pOH=-log[9\times 10^{-5}]=4.04[/tex]
[tex]pH+pOH=14[/tex]
[tex]pH=14-404=9.96[/tex]
Thus pH of a 0.00250 M oxycodone solution is 9.96