Answer:
the answer for your question is veins
Answer:
blood vessels aka veins
find the pOH of a solution made by dissolving 10.4g of HCl in a 500mL solution of water
The pOH of a solution : 13.756
Further explanationMass HCl=10.4 g
mol HCl (MW=36.5 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}=\dfrac{10.4}{36.5}=0.285[/tex]
Volume of HCl = 500 ml = 0.5 L
[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{0.285}{0.5}=0.57~M[/tex]
HCl ⇒ H⁺ + Cl⁻
[H⁺]=[HCl]=0.57 M
pH= - log[H⁺]
pH=-log[0.57]=0.244
pH+pOH=14
pOH=14-0.244
pOH=13.756
Which of the following steps will slow down the reaction between coal and oxygen?
Answer:
decrease temperature of the oxygen
Explanation:
Answer: I believe it it decrease temp of oxygen
Explanation:
how many molecules of H3PO4 are in 125 g of H3PO4
Answer:
2.11 * 10^3 molecules of phosphoric acid
Explanation:
Values of R, the ideal gas constant, and the ideal gas equation are given below. Use these to solve the problems.
PV = nRT
A 10.0-L rigid container holds 3.00 mol H2 gas at a pressure of 4.50 atm. What is the temperature of the gas? (Round to the nearest whole number)
K
Answer:
183 K
General Formulas and Concepts:
Chemistry - Gas Laws
Combined Gas Law: PV = nRT
P is pressureV is volume (in Liters)n is amount of molesR is gas constant - [tex]0.0821 \frac{L \cdot atm}{mol \cdot K}[/tex]T is temperature (in Kelvins)Explanation:
Step 1: Define
10.0 L
3.00 mol H₂
4.50 atm
Step 2: Find Temperature
Substitute [CGL]: [tex](4.50 \ atm)(10.0 \ L) = (3.00 \ mol)(0.0821 \frac{L \cdot atm}{mol \cdot K})(x \ K)[/tex]Isolate temperature x: [tex]\frac{(4.50 \ atm)(10.0 \ L)}{(3.00 \ mol)(0.0821 \frac{L \cdot atm}{mol \cdot K})} = x \ K[/tex]Rewrite: [tex]x \ K = \frac{(4.50 \ atm)(10.0 \ L)}{(3.00 \ mol)(0.0821 \frac{L \cdot atm}{mol \cdot K})}[/tex]Evaluate: [tex]x = 182.704 \ K[/tex]Step 3: Check
Round to the nearest whole number.
182.704 K ≈ 183 K
materials that prevent the heat to flow call
Answer:
Materials that prevent heat to flow are known as heat insulators.
Explanation:
hope it helps! ฅ'ω'ฅ
I am lost someone help me!!
Try tissue
Explanation:
Question 11 of 32
When do scientists form a hypothesis?
A. Before they form a theory
B. After they form a theory
O C. Before they perform an experiment
D. After they perform an experiment
SUBMIT
Answer:
C
Explanation:
a hypothesis always comes first
Answer:
C
Explanation:
They form hypothesis first, then perform the experiment to test the hypothesis. After multiple experiments, they form a theory.
Thus C is correct
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Compared to compounds with network structures, compounds arranged in molecules (covalent bonds) have ____________ melting points.
Explanation:
.... have lower melting points.
What happens to the velocity of an object when balanced forces act on it?
a.
There will be no change
c.
There will be negative acceleration
b.
There will be positive acceleration
d.
Velocity will change, but not acceleration
Answer:
There will be negative acceleration.
Explanation:
I majored in Physics
Answer:
A. There will be no change
Explanation:
Velocity is defined as the directional speed of an object in motion. Balanced forces do not result in any change in motion. Thus, there would be no change in velocity.
he amount of sun that an area receives affects the movement of water through the water cycle, which is illustrated below.
water cycle diagram
Which of the following processes in the water cycle is most directly caused by water absorbing energy from the sun?
Group of answer choices
precipitation
condensation
evaporation
runoff
Answer:
evaporation
Explanation:
The process of evaporation is as a result of water absorbing energy from the sun.
The process is a phase change in which liquid water changes into gaseous form.
The water in gaseous form is called vaporThis water cools and condenses in the atmosphere as it loses the energy it has gained. For evaporation to take place, water must absorb energy from the sun or other heating bodies. This will then cause vaporization of the liquid water into a gaseous form.10 points Which of these is the best example of heat transfer by radiation? *
1 point
a) A satellite is warmed by sunlight.
b) A ceiling fan cools a warm room.
c) Butter melts on warm bread.
d) Puddles of water cool a warm tile floor.
Answer:
a) A satellite is warmed by sunlight.
Explanation:
Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.
Which of the following correctly describes a proton? Group of answer choices Location: nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: virtually none, charge: positive Location: outside nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: usually about half, charge: none
Answer:
Location: nucleus, contribution to mass: usually about half, charge: positive
Explanation:
Protons are a part of the nuclear particles alongside the neutrons. Protons and neutrons are all together called sub-atomic particles and they share the nucleus at the center of an atom together.
Protons carry positive charges. They determine the mass of the atom alongside the neutrons. They contribute half to the mass of an atom and the other part is lies on the mass of a neutron. Neutrons do not carry any charges.1 What is the approximate altitude of Polaris when viewed from New York City?
Answer:
44° to 45°
Explanation:
The altitude of Polaris star when viewed from New York City is somewhat between 44° to 45°. However, Polaris is directly overhead at the North Pole (90° of latitude); in other words, the angle between Polaris and the horizon at the North Pole is 90°. This angle is called "the altitude" of Polaris.
look.............................................
Answer:
Your answer is correct.
Explanation:
The steel paper clip would only move because it has steel in it, which is a magnetized material, plastic on the other side, is made up of polymers which are not attracted to the magnetic force, causing it not to move.
A student mixes two chemicals in a test tube. She notices that the mixture starts to bubble and the test
tube feels very warm. The student most likely concludes that the mixture is-
F. a chemical reaction that happened too quickly.
G. an endothermic reaction that absorbed thermal energy.
H. an exothermic reaction that released thermal energy.
J. not a chemical reaction.
Answer:
H. an exothermic reaction that released thermal energy.
Explanation:
The student will most conclude that this is a chemical reaction in which thermal energy is released to the environment.
Such reactions accompanied by the release of thermal energy are exothermic reactions.
In an exothermic change, heat is liberated to the surrounding. The surrounding becomes hotter at the end of the changes. For such reaction we say that enthalpy change is negative.For endothermic reactions, heat is absorbed. At the end of the reaction, the system is cold.
Please answer fast, shouldn't take long to do ^-^ (will give brainliest)
Which is the correct formula for iron (II) phosphate?
a. Fe2PO4
b. Fe3(PO4)2
c. Fe2PO3
d. Fe(PO4)2
e. Fe(PO3)2
Answer:
B
Explanation:
Which reverses the flow of current through an electric motor?
A brush
B battery
C armature
D commutator
Answer:
D
Commutator is the answer
Explanation:
The commutator systematically converts the current direction between the rotor and the outer circuit. As the shaft revolves, the commutator converts the course of current in a winding. For a separate armature winding, when a cylinder has reached one-half perfect turn, the winding is now attached so that current passes through it in the reverse of the original direction.
Answer:
D. Commutator
Explanation:
I just took the quiz. credit to the person above me.
can bees really fly if so why
What is a transform boundary, and how does it affect the land?
Answer:
simple
Explanation:
A transform fault or transform boundary is a fault along a plate boundary where the motion is predominantly horizontal.[1] It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.[2]
In a covalent compound like O2, two pairs of electrons are shared between the atoms. What is the name given to a bond like this?
Explanation:
The bond is a covalent bond.
Please help! This is due in 10 minutes!
Answer:
Nitrogen-15
Explanation:
To use the correct notation, you need to use the mass number. The mass number is the number of protons plus the number of neutrons. Nitrogen has 7 protons. This isotope of nitrogen has 8 neutrons.
The correct notation is nitrogen-15.
The process of burning a fossil fuel to release energy is called
Answer:combustion
Explanation:
2. How many moles are found in 3.2 x 1023 atoms of NaCl?
Answer:
0.53 mol NaCl
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.2 × 10²³ atoms NaCl
Step 2: Identify Conversions
Avogadro's number
Step 3: Convert
[tex]3.2 \cdot 10^{23} \ atoms \ NaCl(\frac{1 \ mol \ NaCl}{6.022 \cdot 10^{23} \ atoms \ NaCl} )[/tex] = 0.531385 mol NaCl
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
0.531385 mol NaCl ≈ 0.53 mol NaCl
What is the volume of 2 moles of He at STP?
Answer:
STP conditions imply a temperature of 273.15 K and a pressure of 100 kPa. When tose conditions are met, 1 mole of any ideal gas will have a volume of 22.7 L. So, if 1 mole occupies a volume of 22.7 L, 2 moles will occupy a volume twice as big. Likewise, 0.5 moles will occupy half the volume 1 mole occupies. Assuming that the gas is at standard temperature and pressure (STP), one mole of any gas occupies 22.4 L . This means the number of moles of O2 is 222.4=0.089 mol .
Explanation:
A syringe with 32.0 mL contains gas at 649.0 mmHg. The plunger is pushed in and now the volume is 19.5 mL. What is the new pressure?
Answer:
1.40 atm
Explanation:
P1V1 = P2V2
P2= P1* V1/V2
P1=649.0mmHg
V1= 32.0mL
V2= 19.5mL
P2=649.0mmHg*32.0ml/19.5ml=
1065.03mmHg
To get mmHg to atm. The formula is 1atm/760mmHg
Use the answer you got in mmHg to convert into (atm), If you were asked
1065.03mmHg*(1atm/760mmHg)= 1.40atm
(2k-1)²
what the answer pls.
Answer:
4k^2-4k+1
Explanation:
Plx give brainlyest
What mass of gold (Au) contains the same number of atoms as 2.61 g of aluminum (Al)?
Answer:
19.11g
Explanation:
mole = mass ÷ molar mass
mole = 2.61 ÷ 27
mole = 0.097mol
Number of atoms in 2.61g of Aluminum = 6.022 × 10^23 × 0.097
= 0.584 × 10^23
= 5.84 × 10^22atoms
To get the same number of atoms for Gold (Au), we multiply the atomic mass of Au by 0.097mol
Atomic mass of Au = 197g/mol
mass = mole × molar mass
mass = 0.097 × 197
mass = 19.109g
mass = 19.11g
What happens in a chemical reaction and what does it require
Answer: i need a pic of it plz
Explanation:
plx
What is causing the Hot Springs to be so hot? What is causing Hot Springs to be so acidic?
Answer:
Hot springs are hot because of geothermal heat. The Hot springs are acidic because hydrogen sulfide and carbon dioxide get in touch with water they evaporate which causes acid.
Explanation:
element compound mixture
