Elements that are generally shiny when smooth and clean.
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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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.
What has modern media shown you about atoms
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.
Fossils of sea creatures have been found near the top of Mount Everest (8848m above the sea level). How do you think they could have got there?
Explanation:
The fossils can be found on top of mount Everest due to regional uplift of the crust.
Mount Everest is located a along a convergent margin between two tectonic plate. Due to similarity in density between the two margins, when they collide, there is tectonic build up.
Sedimentary rock layers originally at sea levels are uplifted to those tower peaks as the plate continues to grind against each other.
Most sedimentary rocks contains fossils. As the grinding continues, the uplift and deformation continues.
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!)
If a star has a higher apparent magnitude, what does that mean? A low apparent magnitude?
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:
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:
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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True or False: Water molecules, as a liquid, are very spread apart because of their attractions for one another. *
C3H5(NO3)3
How many atoms of oxygen are there?
Answer: 6
Explanation:
Mark brainliest plzzz if correct
In C₃H₅( NO₃ )₃ there are total six number of oxygen atoms are present and three atoms of carbon, 5 atoms of hydrogen and 3 atoms of nitrogen present.
What is oxygen ?The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.
Dioxygen is the name given to the colorless, odorless, and tasteless gas that is oxygen at standard pressure and temperature.
Chemical elements are substances that only contain one kind of atom, such as oxygen. Since oxygen has an atomic number of 8 and the official chemical symbol O, an oxygen atom has eight protons in its nucleus. At room temperature, oxygen is a gas that has no flavor, color, or odor.
Thus, In C₃H₅( NO₃ )₃ there are total six number of oxygen atoms are present.
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What is the molarity of a solution prepared by diluting 43.72 ml of 1.005 M aqueous K2CR2O7 to 500 ml
Answer:
43.72
Explanation:
that is the answer hope u liked it and I did this already along time ago
The molarity of the solution will be "0.088 M".
Given values are:
Volume,
[tex]V_1 = 43.72 \ ml[/tex][tex]V_2 = 500 \ ml[/tex]Molarity,
[tex]M_1 = 1.005 \ M[/tex][tex]M_2 =?[/tex]By using the Dilution principle, we get
→ [tex]M_2 = \frac{M_1 V_1}{V_2}[/tex]
By substituting the given values, we get
→ [tex]=\frac{1.005\times 43.72}{500}[/tex]
→ [tex]= \frac{ 43.9586}{500}[/tex]
→ [tex]= 0.088 \ M[/tex]
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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.
Use the equation below to solve the problem that follows.
2H2 (g) + O2 (g) → 2H2O (g)
When David reacts 13.8 grams of hydrogen gas with excess oxygen, 87.0 grams of water are formed. Calculate his percent yield of water.
Im very loss with this question
Percent yield of water : 70%
Further explanationReaction
2H₂ (g) + O₂ (g) → 2H₂O (g)
mol H₂(MW= 2 g/mol) :
[tex]\tt \dfrac{13.8~g}{2~g/mol}=6.9~mol[/tex]
mol H₂O = mol H₂ = 6.9
mass H₂O(theoretical) :
[tex]\tt 6.9\times 18~g/mol=124.2~g[/tex]
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{87}{124.2}\times 100\%=70\%[/tex]
What is the function of enzymes in living organisms?
Answer:
jh
Explanation:
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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Give the IUPAC name:
Answer:
hope the answer helps you
Explanation:
3 ethyl 2 hexene
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By the IUPAC Naming Convention followed by every chemical standards, the structure from the question is named as 4,4-dimethyl heptane.
IUPAC Stands for International Union of Pure and Applied Chemistry.This organisation issued some standards for naming any chemical components that is followed world wide.
According to the IUPAC Standards:
First of all we have to identify the longest carbon chain which is an alkane group according to this question.As a result of 7 carbon linked with single bonds it will be named heptane.Now moving to the other parts:
[tex]-CH3[/tex] is termed as methyl
As the both the methyl group( [tex]-CH3[/tex] ) is linked with the fourth carbon the numbering is 4 for methyl.So,the IUPAC name of this compound in the image is 4,4-dimethyl heptane.
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The top layer of a flat lying sedimentary rock is the…
most eroded
most under formed
oldest
youngest
youngest
hope this helps anyone<3
Answer:
The answer is youngest.
Explanation:
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:
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
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:
What is one way land helps reduce the force of hurricane as it moves inland
Answer:
because they are fueled by evaporation from warm ocean water, which dry land surfaces do not provide.
Explanation:
Answer: Other person was wrong correct answer is Land filters the water forced up from the sea by the wind :)
Explanation:
.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
Neutral atoms have the same number of____
What’s the missing word?
Answer:
electrons and protons
Explanation:
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:
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!
the following body systems is responsible for releasing waste?
Answer:
the urinary system??
Explanation:
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?
