Answer:
B
Explanation:
The goal of cellular respiration is to produce energy (in the form of ATP) for the cell.
During cellular respiration, food materials are broken down metabolically and the energy locked-up in them is extracted for day-to-day usage by the cell. This energy is usually in the form of the energy currency of the cell - Adenosine Tri Phosphate. The cellular respiration could either be in the presence of oxygen (aerobic) or in the absence of it (anaerobic).
Correct option: B.
I need help with this one please it’s science
Answer: A change in appearance. (Please say thanks!)
Explanation:
The biggest sign of a chemical change is change in appearance.
Answer:
d
Explanation:
If a star has a higher apparent magnitude, what does that mean? A low apparent magnitude?
How do the products of chemical reactions compare to their reactants?
Question 5 options:
The products often have completely different properties than the reactants.
The products usually weigh more than the reactants.
The products usually have more atoms than the reactants.
The products are usually more toxic than the reactants.
Answer: The products usually weigh more than the reactants.
Explanation:
Answer:
A
Explanation:
i just took the k12 test
Which is the last section of the digestive system?
small intestine
liver
large intestine
rectum
The last section of the digestive system is the rectum.
What is digestive system?Digestive system is the system of the body that comprises of organs,enzymes that help to break down large molecules of food into smaller mole yles which is easily absorbed by the body.
Therefore, The last section of the digestive system is the rectum.
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Answer:
r3ctum
Explanation:
for people on edge.
10. A gas sample that has a mass of 6g occupies 400 mL at 504°C and a pressure of 600 mm Hg. Calculate the gas’s density at STP.
Answer:
51 g/mol
Explanation:
Whenever you see molar masses in gas law questions, more often than not density will be involved. This question is no different. To solve this, however, we will first need to play with the combined ideal gas equation PV=nRT to make it work for density and molar mass. The derivation is simple but for the sake of time and space, I will skip it. Hence, just take my word for it that you will end up with the equation:
1 You place a 28.95-g piece of gold in a 10-ml graduated cylinder. The level of the water rises 1.50 mL. What is the density of gold?
Answer:
What mass of silver will raise the level of the water in the graduated cylinder 1.50 mL? (Ans) 28.95 g / 1.50 mL = 19.3 g/mL (The gold's density)
19.3 gm/ml³ is the density of gold .
What do you mean by the density of the substance?Density, mass of a unit volume of a material substance. Density of a substance tells how close the particles of a substance are packed.
The formula for density is D = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimeter.
The SI unit of density is kilogram per cubic meter (kg/m3).
It is also represented in the c g s unit of grams per cubic centimeter (g/cm3).
To calculate density of gold (here):
Given,
Mass of gold=28.95 gm
Volume of water=1.50 mL
Density=?
Density =Mass/Volume
Density=28.95/1.50
Density=19.3 gm/ml³
Hence, 19.3 gm/ml³ is the density of gold .
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What is the function of enzymes in living organisms?
Answer:
jh
Explanation:
What has modern media shown you about atoms
PLEASE HELP!!!!
What is the molar mass of 18.12 g of gas
exerting a pressure of 3.05 atm on the
walls of a 5.85 L container at 280 K?
Answer:
23.3 g/mol
Explanation:
The molar mass of 18.12 g of gas exerts a pressure of 3.05 atm on the walls of a 5.85 L container at 280 K is 23.3 g/mole.
What is the molar mass?Molar mass is the concentration of a substance that is present in a specific liquid. It is also called the concentration of a substance.
The molar mass can be calculated by the formula of an ideal gas:
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the constant of gas.
T is the temperature.
The given amounts are the molar mass of 18.12 g.
The pressure is 3.05 atm.
The volume is 5.85 L
The temperature is 280 K
Putting the value in the equation
n = PV/RT = (3.05) (5.85) / (0.0821) (280) = 0.777 moles of gas
Molar mass = 18.12 g/0.777 moles = 23.3 g/mole
Thus, the Molar mass is 23.3 g/mole.
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The half-life of carbon-14 is about ____________ years.
Fill in the blank.
Answer:
5730 years
Explanation: for more on radiocarbon dating.) and hence explain why the amount of carbon-14 in the sample decays by half over any period of 5730 years.
How many electrons does each atom have? What group is each in?
In an atom, the electron's spin around the center, also called the nucleus. The electrons like to be in separate shells/orbitals. Shell number one can only hold 2 electrons, shell two can hold 8, and for the first eighteen elements shell, three can hold a maximum of eight electrons. ( This is the answer to both questions!)
Neutral atoms have the same number of____
What’s the missing word?
Answer:
electrons and protons
Explanation:
PLS HELP
True or False: Water molecules, as a liquid, are very spread apart because of their attractions for one another. *
Where do you find the Group 1 and Group 2 metals?
Answer:
far left
Explanation:
Harry dissolved 9.36 g sample of LiOH into water in a calorimeter. The temperature of the calorimeter rose from 36.9 degrees Celsius to 52.8 degrees Celsius. The heat capacity of the calorimeter and its contents is 639 J/ degC. What is the enthalpy for the solution process if Harry repeats the lab again and 2.85 mol of the LiOH was dissolved? Given: the molar mass of LiOH is 23.95 g/mol
Answer:
did u get the answer?
Explanation:
PLEASE HELP ME
1) What is the difference between an exothermic and an endothermic process?
2) Which changes of state are exothermic and which are endothermic
Answer:
1)In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system
2)Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes.
Answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
Explanation:
googled it for you hope it helps.
:)
4) How does an atom have a charge of -3?
Answer:
When the electrons hit the atoms in the chamber, they cause some of the electrons in the atoms to be stripped or knocked away. ... When one or more electrons is knocked off of an atom, it becomes positively charged. It is now an positive ion. A negative ion can be made by adding an electron to an atom.
Explanation:
please only do the ones I didn't do I will give brainiest
Heat transfer has to do with the movement of heat from one point to another.
What is heat transfer?The term heat transfer has to do with the movement of heat from one point to another. There are three modes of heat transfer and these are;
1 Conduction
2 Convection
3 Radiation
Now, we shall try to establish the modes of heat transfer here;
1) The oven get warmer while transporting a hot baking dish - conduction
2) Maslow heats over fire - Radiation
3) The sun causes water in the pond to evaporate - Convection
4) Hot air inflates a balloon - conduction
5) Heat from the air is absorbed by ice cubes - conduction
6) A hot horseshoe transfers heat to tongs - conduction
7) A pot sitting on a hot burner - conduction
8) A bowl of cereal cools - convection
9) Water is warmed over fire - conduction
10) spoon gets warmer after sitting over a bowl of soup - Conduction
11) A microwave heats food - Radiation
12) An infrared sensor detects body heat - radiation
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What are isotopes?
A.) Atoms of the same element that have a different number of protons
B.) Atoms of the same element that have a different number of neutrons
C.) Atoms of different elements that have the same number of neutrons
D.) Atoms that are unstable
Answer:
B
Explanation:
Answer:
B. ATOMS OF THE SAME ELEMENT THAT HAVE A DIFFERENT NUMBER OF NUETRONS
Explanation:
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
What does it mean when an element has no subscript in a chemical formula?
Answer:
the element has no subscript because it is only one atom of it
Explanation:
If there isn't a subscript, it's presumed that there is only one atom of that element present.
What is subscript?Subscript is defined as a character that is printed slightly below and to the side of another character, commonly a letter or a number. A subscript is a character that is printed slightly below and to the side of another character, commonly a letter or a number. Chemists frequently employ subscripts in their formulations.
There is no number written if there is just one atom. The number is given as a subscript after the atom if there are multiples of a particular kind of atom. The number on the right side of the symbol indicates how many atoms of that element are contained in the molecule. The atomic number of an element is shown as a subscript on the left-bottom corner of a stand-alone symbol.
Thus, if there isn't a subscript, it's presumed that there is only one atom of that element present.
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50 points:
Several thousand years ago, people sought after the truth about the nature of matter by
Answer:
Is this a true or false?
Explanation:
is this a t or f question?
What term is used for the electrons in the outermost shell or energy level
Answer:
Valence Electrons
Explanation:
Answer:
Valence
Explanation:
The outermost shell are the valence electrons
This is Q7 and I need help, can someone help.
Answer:
Answer to A. helium, neon, argon, krypton, xenon, and radon, B. Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2). C. Elements Compounds
Ar (argon) HBr (hydrogen bromide) C 3H 8 (propane)
Kr (krypton) HI (hydrogen iodide) C 4H 10 (butane)
Xe (xenon) HCN (hydrogen cyanide)* CO (carbon monoxide)
Rn (radon) H 2S (hydrogen sulfide) CO 2 (carbon dioxide)
Explanation:
This is a science question. What is the acceleration of the dragster?
Answer:
8.89m/s^2
Explanation:
The question is asking what rate the dragster is accellerating. In science, acceleration is a change in velocity (speed) and direction. So, the speed decreases 40 m/s. It does this in 4.5 seconds. That's 40m/4.5 seconds. So, when you simplify that, it's 8.999999...m/s.
Which of the following describes a species with the greatest fitness?
The species that can reproduce beter than the others
The species that is faster than the others
The species that is stronger than the others
The species that is larger than the others
Answer:
C is it!
Explanation:
Why was the International System of Units (SI) developed?
A.It was developed to compete with the English Standard System of Units.
B.It was developed to allow countries to follow their own systems of measurement.
C.It was developed to help scientists keep their data, observations, and measurements secret from other scientists.
D.It was developed to help scientists compare measurements made by different people in different locations using different tools.
PLEASE NO FAKES!
Answer:
C
Explanation:
it to avoid mistakes and understand each other more easily and ensures wide world dissemination of the Si and modifies the Si to its latest advanced in technology. I hope this help!
Answer:
C. makes the most sense to me.
So sorry if this is not right. But Hope This Helps!
Janet is sliding a box across the floor what does she need to know to calculate the force on a box?
Answer:
She needs to know the Mass and acceleration
Janet needs to know the mass of the box and acceleration .
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What represents a community?
pond
B
a snail
snails
D snails, guppies and plants
D snails, guppies and plants. The community should be diverse and have lots of biodiversity.
Answer:
to
Explanation:
to
.Which statement about transition elements is correct?A Their soluble salts usually form coloured aqueous solutions. B They are all in the same group of the Periodic Table. C They are non-metals with high melting points. D They can be mixed together to form compounds
Answer:
A Their soluble salts usually form coloured aqueous solutions
calculate the number of moles
for 66 gram of CO2
Answer:
1.55
Explanation:
The number of moles = given mass / molar mass
The given mass is 66 g and the molar mass is 44 g/molar mass
Substituting the values in, we get that:
the number of moles = 66/44
the number of moles = 1.55
hope this helped!
