Answer:d
Explanation:
d
Hydrogen molecules being forced together by gravity is what best describes how a star is fuelled.
What is Gravity?This is defined as the the universal force of attraction acting between all matter.
Hydrogen molecules is forced together by gravity which is how stars are fuelled in space thereby making option D the most appropriate choice.
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What is the specific heat of ethanol if 4650 j are required to raise the temperature of 250.0g of ethanol from 22.0oc to 29.6 degrees Celsius
Answer:
[tex]C=2.45\frac{J}{g\°C}[/tex]
Explanation:
Hello there!
In this case, since the thermodynamic definition of heat in terms of mass, specific heat and temperatures is given by:
[tex]Q=mC(T_2-T_1)[/tex]
We are to calculate the specific heat of the ethanol as shown below:
[tex]C=\frac{Q}{m(T_2-T_1)}[/tex]
Thus, by plugging it the given data we can obtain:
[tex]C=\frac{4650J}{250.0g(29.6-22.00\°C)} \\\\C=2.45\frac{J}{g\°C}[/tex]
Regards!
WHAT IS THE PH OF LEMON JUICE IF IT HAS A HYDROGEN ION CONCENTRATION [AT]ON[H^ + ]=5.0*10^ -2 M.
Can somebody help me please !!!!!!
Answer:
ph=2
Explanation:
how many grams of chromium are needed to react with of cuso4 to produce 10.2g cu
Answer:
14.7 g of chromium
Explanation:
are you chemistry because you just blew up my heart
Answer:
i needed that lol
thank you
Explanation:
How does every single cell in the body get the substances it needs to carry out the chemical reaction that provides it energy?
You use 50.00 mL of a 12.0 M solution of HCl solution to make a 500.00 mL solution. What is the concentration of the new solution? *
Answer:
1.2 M
Explanation:
If you use the dilution equation (M1V1=M2V2), you end up with (50)(12)=(500)(M2), and when you solve for M2 you get 1.2 M.
What is the density of 1.00 mol of carbon monoxide gas at STP?
Answer:
Density = mass / volume.
If this is an ideal gas then 1mol will take up 22.4L of volume (fact about ideal gases you should remember)
Since you have 1mol then you know the volume of the gas that you have (22.4L)
Now, just convert 1mol of CO to grams.The ptable tells you that the mass of 1 mol of C is 12g and the mass of 1 mol of O is 16g. So the mass of 1 mol of CO is......... :):)
Now you have the mass and the volume, so just divide :) enjoy
How many atoms are in 14 moles of I? Watch your significant figures.
A. 8.4 x 10^24 atoms of l
B. 8.43 x 10^24 moles of l
C. 8.4 x 10^23 atoms of I
D. 8.43 atoms of l
Answer:
8.43 x 1024 moles of I
Explanation:
what is a pure substance?
Answer:
A pure substance is a substance or an element whose impurities are extracted by concentration by chemical means.
e.g Aluminium is made pure by concentration of it's ore, bauxite by treatment with excess Sodium Hydroxide solution.
.Which best describes the structure of 2-butene?
A. a four-carbon hydrocarbon with a double bond between the second and third carbon atoms
B. a four-carbon hydrocarbon with a branching point at the second carbon atom in the chain
C. a four-carbon hydrocarbon with a double bond between the first and second carbon atoms
Answer:
A.
Explanation:
The 2 - butene is an alkene with the formula C4H8, which can be used as the polybutene monomer or co-polymer. It is a compressed liquefied gas colorless, highly flammable characteristic odor. Prolonged exposure to this gas can cause frostbite causing a lowering of consciousness. Its formula is C4H8 and it is made up of 4 carbon atoms.
The best structure that describes 2-butene is that of Option A.
1. A student performed the titration as in this experiment. He transferred a 2.00 mL sample of the
acid into a flask, diluted it with water, and then began to add sodium hydroxide solution from the
buret. After adding 50 mL of NaOH solution, the sample in the flask still had not turned pink.
What error did the student make?
Answer:
The student shouldn't have added water to the acid.
Explanation:
The aim of titration is to standardize an unknown solution. Recall that a standard solution is one whose concentration is known.
After the acid has been prepared, it has a particular concentration. The student should't have diluted it further. The further dilution of a small volume of acid drastically reduces the concentration of the acid to such low value that the H^+ ions present are insufficient to react with the OH^- from base in order to turn the solution to pink.
What is the name of the element represented in the model?
O A. Beryllium
B. Boron
O C. Oxygen
O D. Flourine
Answer:
Your answer is B
Boron
Good luck
Explanation:
What volume of a 40.0 % by volume acetone solution can be
made with 20.0 mL of acetone?
Answer:
50 milliliters of acetone solution
Explanation:
If a solution is 40% by volume of acetone, then we have 40 mL of acetone in a 100 mL solution. So if we have 20 mL of acetone, we get: 100 mL solution 40 mL ( CH3) 2CO⋅
20mL (CH3) 2CO =50mL solution
The volume percent of 40% indicates that 40 ml of acetone is present in 100 ml solution. Then, 20 ml acetone can be made into 50 ml solution.
What is volume percentage ?Volume percentage is a common term used to express the concentration of a solution. Volume percentage of a solution is the ratio of the volume of the solute to the volume of the solvent multiplied by 100.
The volume percentage of the solution measures how much volume of the solute is present in 100 ml of the solution. Thus a 50% by volume solution is 50 ml solute in 100 ml solution.
Given that volume percentage of acetone = 40%.
that is 40 ml of acetone is present in 100 ml of the solution.
Therefore, the volume of the solution containing 20 ml of acetone is :
(20 × 100)/40 = 50 ml.
Therefore, 50 ml of 40% by volume o solution can be made by 20 ml of acetone.
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1. Friction acts in a direction
to the
direction of an object's motion.
a. unrelated
b. opposite
c. equal
d. perpendicular
Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.
What is Friction?Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.
Friction can be described as a force that is dependent on external factors. Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.
Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.
The force of friction acts in the opposite direction to the direction of an object's motion.
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DUE TONIGHT!
I need help doing this question and please type an ACTUAL answer. I don’t want none of that “aNsWeR iN FiLe”. Thank you!
Calculate the specific heat (Cp) for indium metal given a 1.0 mole absorbs 53.0 J
while increasing in temperature from 297.5K to 299.5K.
Answer:
27J/Kmol
Explanation:
Heat = number of moles times the Moeller heat capacity chimes the change in temperature.
^ Q = nC△T
^ C = Q/ n△T = +53J / (1mol) (299.5K - 297.5K)
^ = 26.5 (rounded to 27)
Science please help. I will add you and please don’t give me any random websites
Answer:
C
Explanation:
Answer:
D)
Explanation:
On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.
BRAINLIEST IF EXPLANATION IS GIVEN AND ANSWER IS CORRECT:
How much energy is required to raise the temperature of 15.6 grams of ice from -8.76 degrees Celsius to 85.9 degrees Celsius? Use 3 sig figs.
Answer:
Q = 2997.69 J
Explanation:
Given that,
The mass of ice, m = 15.6 grams
The temperature increases from -8.76 degrees Celsius to 85.9 degrees Celsius.
The specifc heat of ice is 2.03 J/g°C
We need to find the amount of energy required. The formula for energy required is given by :
[tex]Q=mc\Delta T\\\\=15.6\times 2.03\times (85.9-(-8.76))\\\\=2997.69\ J[/tex]
So, the required heat is equal to 2997.69 J.
What is the density of a block of wood with a volume of 16.5 ml and mass of 6.39g?
Answer:
0.38
Explanation:
The formula for finding density is mass/volume. So the equation becomes 6.39/16.5 which gives you 0.38
can someone do this for me i wasent there when we learned it
Can anyone list me all the 8 groups of the periodic table , going in order of course?
Answer:
alkali metals
alkali earth metals
transition metals
non metals
noble gases
halogens
rare earth metals
Explanation:
The heart works directly with which
Liver
Lungs
Kidneys
Brain
Answer:
Lungs.
Explanation:
They bring the blood throughout the body, to help it function properly
A ball is sitting at the top of a ramp. As the ball rolls down the ramp, the potential energy of the ball decreases. What happens to the potential energy as the ball moves
Answer:
it is converted to kinetic energy
2. Energy that is stored in an object because of its temperature is called ___________________. *
Answer:
Thermal Energy
Explanation:
The thermal energy of an object increases as the temperature increases, causing atoms and molecules to move faster. When the temperature decreases, the thermal energy decreases, causing atoms and molecules to move slower. Another term for thermal energy is heat energy.
PLEASE HELP!!
Which statement describes the first step in soil formation?
A: Small, simple plants begin to grow.
B: Parent rock breaks into smaller pieces.
C: Humus begins to mix with sediment.
D: Organic material starts decomposing.
Answer:
B: Parent rock breaks into smaller pieces.
Explanation:
Weathering the first step in the process of soil formation. The process of breaking up off the parent rocks into simple forms, is termed as weathering. The formation of soil is a very gradual and slow process. It takes millions of years for the rocks to become soil. The dead and decaying matter of plants and animals are also included in the rocks. Water, sun, climatic conditions and rain are some of the factors that effect weathering.
Answer:
32
Explanation:
I found it
what is the difference between isotopes and allotrope not more than three line
Answer:
An allotrope is one way that atoms can be arranged in a solid. An isotope is one way that protons and neutrons can form the same atomic element.
how does this data provide evidence for base pairing in dna
Answer:
There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
determining the molecular formula of a hydrocarbon with a relative molecular mass of 54
Answer:
C₄H₆
Explanation:
A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.
To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:
54g/mol / 12g/mol = 4.5
As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:
12g/mol*4 = 48g/mol
And the hydrogens necessaries to suply the molecular mass are:
54 - 48 = 6 hydrogens
That means molecular formula is:
C₄H₆Chemistry Questions
5) What is matter? Mention the characteristic of particles of matter.
Answer:
As known matter is anything that occupies space and has mass.
You have 1 1/2 moles of 1 kg bottles of O2. What is the mass of O2 that you have?
A. 9.033x10^23 kg
B. 9.033x10^23 atoms
C. 1.80x10^27 kg
D. 1.806x10^24 moles
It is not B as I have already tried it :(
Answer:
A: 9.033 × 10^(23) kg
Explanation:
According to avogadro's number, we know that;
1 mole = 6.022 × 10^(23) kg
Thus;
1½(1.5) mole of O2 will produce;
(1.5 × 6.022 × 10^(23))/1 = 9.033 × 10^(23) kg
Looking at the options, the correct one is Option A.
What is the main need or want the wave technology shown meets?
Answer: To efficiently communicate with others
Explanation:
this was the right on answer for me might be different for others
The main need or want the wave technology shown meets to see objects surrounding more clearly.
What is wave technology ?It is a floating device that operates in the same direction as the waves. With the use of the technology, energy may be captured even from relatively small waves. The device that is moved by waves activates a hydraulic system that can power a generator. The tube segment contains all the generation equipment and systems.
Early mechanization (1770s to 1830s), steam power and railroads (1830s to 1880s), electrical and heavy engineering (1880s to 1930s), Fordist mass production (1930s to 1970s), and information and communication are the five waves that have so far slammed into our society (1970s to 2010s).
Wave energy, also known as wave power, is the energy that ocean surface waves carry and absorb. The energy is then put to use in a variety of productive ways.
Thus, The main need or want the wave technology shown meets to see objects surrounding more clearly.
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