Answer:
Paraffin oil is used for determination of boiling point and melting point for the following reasons: It has a very high boiling point and so it can be used to maintain high temperatures in the boiling and melting point apparatus without loss of the substance.
What is the product of the first beta decay in this series?
A)
AC-227
B)
Ac 228
Ra-227
D
Rn 224
Answer:
B)
Explanation:
In beta decay the nucleus loses a neutron and gains a proton. The mass therefore remains constant but the atomic number increases by one.
Two moles of phosphoric acid (H3PO4) contain, respectively: "x" moles of hydrogen atoms, "y" moles of phosphorous atoms, "z" moles of oxygen atoms.
Options:
a)9,3,12
b)2,2,2
c)3,1,4
d)6,2,8
Answer:
d)
Explanation:
in one mole of phosphoric acid you have 3 mol hydrogen, 2 mol phosphorus, and 4 mol oxygen. just multiply everything by 2 and you get 2 mol of phosphoric acid
8. Label the type and parts of the waves shown here.
longitudinal wave
WORD BANK
engitudinal wave
• transverse wave
compression
• rarefaction
crest
trough
Houghton Mifflin Harcourt
Which statement best describes a heart attack?
A. Certain blood vessels expand
B. Certain blood vessels shrinks
C. Blood vessels are normal
D. Certain blood vessels are blocked by fatty acids
Answer:
I think number D is correct
Answer:
D. Certain blood vessels are blocked by fatty acids
Explanation:
A heart attack occurs when the flow of blood to the heart is blocked. The blockage is most often a buildup of fat, cholesterol and other substances, which form a plaque in the arteries that feed the heart (coronary arteries). Sometimes, a plaque can rupture and form a clot that blocks blood flow.
9. The role of an organism in an ecosystemis called alan
O A. habitat
O B. niche
O C. evolution
D. community
1 In general, how many major glands are found in human body?
A. Eight
B. Ten
C! Thirty-two,
D. Forty six
Answer:
A. Eight
Explanation:
Although there are eight major endocrine glands scattered throughout the body, they are still considered to be one system because they have similar functions, similar mechanisms of influence, and many important interrelationships.
It refers to the number of waves produced in one second.
Answer/Explanation:
f is the number of waves produced by a source per second, it is measured in hertz (Hz). T is the time it takes for one complete oscillation, it is measured in seconds. All waves, including sound waves and electromagnetic waves, follow this equation. A radio wave has a time period of 0.0000003333333 seconds.
Which component is missing from the process of photosynthesis?
Carbon Dioxide +
+
Sunlight → Glucose + Oxygen
1-water
2-light energy
3-sugar
4-plants
the ph of a naoh solution is 12.05. what is the concentration of [oh-] of the naoh solution? express your answer in standard notation
Answer:
0.01 M
Explanation:
NaOH (sodium hydroxide) is a strong base, so it is completely dissociated into ions in aqueous solution:
NaOH ⇄ Na⁺ + OH⁻
So, we have OH⁻ ions in solution.
From the problem, we have the pH value. The pH is calculated as:
pH = -log [H⁺]
As NaOH is a base, we can also calculate the pOH:
pOH = -log [OH⁻]
Thus. we can use the relation between pH and pOH to calculate the pOH and then use it to calculate [OH⁻]:
pH + pOH = 14 ⇒ pOH = 14 - pH = 14 - 12.05 = 1.95
pOH = -log [OH⁻] ⇒ [OH⁻] = [tex]10^{-pOH}[/tex]= [tex]10^{1.95}[/tex]= 0.0112 M ≅ 0.01 M
Answer:
0.0112
Explanation:
They said that was the answer.
Rocks are classified on the basis of
Answer:
Rocks are classified according to characteristics such as mineral and chemical composition, permeability, texture of the constituent particles, and particle size. This transformation produces three general classes of rock: igneous, sedimentary and metamorphic. Those three classes are subdivided into many groups.
Explanation:
Am I correct?
As gravity/distance increases between two objects, the gravitational pull between them weakens/strengthens
Yes, As the gravity/distance increases between two objects, the gravitational pull between them weakens/strengthens.
Explanation:There is a gravitational force of attraction between every object in the universe. The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases.
Is hot lava a mineral?
Answer: No.
Explanation:
:)
Answer:
Lava is made up of many different molten minerals and other things such as silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium.
Explanation:
Please brainlist me
HEY COULD SOMEONE HELP ME WITH THIS PLS PLS ITS DUE TODAY PLS
Tell me, how the different states of matter are different and the same.
Answer:
Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. Gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
Kinetic energy is the energy of motion. How could a person determine how much kinetic energy an object has?
A. by finding its position and form
B. by finding its speed and direction
C. by finding its height and width
D
by finding its mass and speed
Reset
Submit
Answer:
B. by finding its speed and direction
Kinetic energy is the energy an object has due to its motion. As long as an object is moving at the same velocity, it will maintain the same kinetic energy. The kinetic energy of an object is calculated from the velocity and the mass of the object.
the Rockies and the Appalachians are two major mountain ranges in the United States. Which type of plate movement caused these mountain ranges to form
Answer:
Convergent
Explanation:
I don't know whether this is one of your answers but It is convergent because convergent boundaries are when two plates collide against each other which can create mountains and volcanos.
How much heat (J) is required to heat a 75.00 g copper block from 35.0°F to 59.0°F?
Answer:
[tex] \sqrt[.132 = ]{32 = ? = 1} = .82[/tex]
Answer:
693 j
Explanation:
weight =75 g * specific heat of copper = .385j/g * change in temp = 24
= 693
What water system is part of the hydrological cycle and generally collects water from precipitation through a drainage basin from
surface runoff and other sources such as groundwater recharge and springs? This water system is usually freshwater flowing towards
an ocean, sea, or lake. In a few cases, it simply dries up completely at the end of its course, and does not reach another body of water.
es 0))
A)
tidal area
B)
watershed
09
wetland
D)
river
Blank is ____ rock in molten form
What is this please help
Answer:
Rock In molten form is Lava
^_^
which is the command center of the body
Answer:
nervous system
or u can say brain too
Explanation:
hope this is what u want
Answer:
Your nervous system is your body's command center.
Explanation:
since it is originated from your brain, it controls your movements, thoughts and automatic responses to the world around you.
complete the equation C14H30 = ________ + C7H14
Answer:
C14H30 -----> C7H14 + C2H4 +C5H10
Explanation:
२
1. A ratio of the parts of a mixture are exact true or false.
which is an example of conduction?
Answer:
i think its b
Explanation:
Move the red warning icon to focus of the earthquake.
Move the green location icon to the epicenter of the earthquake.
Move the blue star icon to the fault.
Answer:
Red goes in the spiky yellow box. Green goes where the red circles are. Blue goes in the small yellow box that is pointing to the line.
Explanation:
The focus of an earthquake is where it starts in the earth. The epicenter is the part directly above the focus on the surface. The fault is the part where the earth's crust splits.
The temperature of a sample of water in the liquid phase is raised 30 degrees Celsius by the addition of 3762 J. What is the mass of the water in grams?
A. 0.03
B. 0.30
C. 30
D. 300
4. What is the maximum no. of electrons that can be associated with the following set of
quantum numbers?
n=4, l=1, m=-1
a) 10
b) 6
d) 2
c) 4
Answer:
d) 2
Explanation:
We are given;
n = 4, l = 1, m = -1
We can tell that is is an orbital with sub shell as 3P.
Now, from Paul's exclusion principle, each orbital will have maximum of 2 electrons of each π with a spin of +½ and -½.
Since the maximum is seen to be 2, then option D is correct.
Molten zinc chloride can be electrolysed.
Describe how this experiment can be carried out in a laboratory, explaining how the products of this electrolysis are formed.
(6) marks
Answer: The products of electrolysis are Zn(l) and [tex]Cl_2[/tex] gas
Explanation:
Electrolysis of a subastance is breaking it into its constituents by the action of electrical current.
In the electrolysis of molten zinc chloride, zinc metal is produced at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode.
[tex]ZnCl_2(l)\rightarrow Zn^{2+}+2Cl^-[/tex]
At anode : [tex]2Cl^-(l)\rightarrow 2e^-+Cl_2(g)[/tex]
At cathode : [tex]Zn^{2+}(l)+2e^-\rightarrow Zn(l)[/tex]
PLEASE HURRY. This is a project please help me as soon as possible.
1. What do you think would have happened if the light pollution had been a permanent condition
on planet Oopsa?
2. What do you think would have happened if the light pollution were green instead of red?
Please help asap. Will give brainliest.
Answer:
Light pollution is excessive, misdirected or inappropriate outdoor lighting. Too much light pollution washes out the view of the Universe, increasing energy consumption, interferes with astronomical research, disrupts ecosystems, and affects the health and safety of humans and wildlife.
Explanation:
Light pollution radically alters their nighttime environment by turning night into day. ... “Predators use light to hunt, and prey species use darkness as cover,” Kyba explains “Near cities, cloudy skies are now hundreds, or even thousands of times brighter than they were 200 years ago.
QUESTION 3
Which statement is WRONG about electromagnetic waves?
A. Electric field is perpendicular to magnetic field.
B. Vibration of electric fields is perpendicular to propagation direction.
C. Different visible waves show different colors.
D. Different waves propagate in different speed.
Answer:
Different visible waves show different colors
In the electromagnetic spectrum, different visible waves show different colors.
What is electromagnetic spectrum?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
Learn more about electromagnetic spectrum,here:
https://brainly.com/question/23727978
#SPJ2
2.)what is the place value of 7 in 970 123 885
3.)in 292.145,what number is in the thousands place?
4.)what is the place value of 9 in 6547.965?
5.)in 476.8976,what is the
value of underline digi?...si number 7 po naka underline.
Answer:
2.place value is 70 000 00
