Explanation: Walking for 30 minutes covers a distance of 2.0 to 2.5 km and burns about 125 calories
Answer:
4.8 hours
Explanation:
12÷2.5= 4.8 hours
two gasses in the air that cause rusting
Answer:
oxygen and Hydrogen
Explanation:
Oxygen and Hydrogen causes rusting on metals after combining with moisture
Elements from which group of the periodic table are most likely to form covalent network solids?
A. Group 6
B. Group 3
C. Group 4
D. Group 5
Answer:
C. group 4 .................
You can tell if an object is in motion if ___.
A. Its reference point is in motion
B. Its reference point is stationary
C. Its position changes relative to a reference point
D. It appears to move backward when another object moves forward
Answer:
c
Explanation:
I think that's the answer
an object with a mass of 300 kg is observed to accelerate at the rate os 4m/s² what is the total force required
Answer:
75 Newton
Explanation:
In order to find the force of the object, you must remember that the equation N = (mass x acceleration). Therefore meaning you would divide 300 kilograms, the mass, by 4 meters per second (squared), the acceleration.
Which of the following is NOT a sign of a chemical reaction:
a
bubbles
b
precipitate
c
changing from liquid to gas
d
color change
Which of the following statements about nonmetal elements is true?
A.) Nonmetal elements are stronger than metals.
B.) Nonmetal elements are never used in computers.
C.) Nonmetal elements are sometimes cheaper to make.
D.) Nonmetal elements are used only in laptop computers.
Answer:
C
Explanation:
The statement which is true about non-metal elements is as follows:
Nonmetal elements are sometimes cheaper to make.Thus, the correct option for this question is C.
What are Non-metals?Non-metals may be defined as those chemical elements that significantly lack the attributes of metals. They generally range from colorless gases to shiny and high melting point solids. Some examples of non-metals include boron, carbon, nitrogen, etc.
Non-metals are not stronger than metals because the arrangement of bonds in metals is highly compacted. Non-metals are very frequently utilized in the manufacture of computers, laptops, and other electronic devices along with metals. But most of the time non-metals are cheaper to synthesize.
Therefore, non-metal elements are sometimes cheaper to make is a statement that is true about non-metal elements. Thus, the correct option for this question is C.
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Can anyone explain this to me?
How many oxygen atoms are there in 5 molecules of Al2(SO4)?
Answer:
There are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.
Explanation:
In 5 molecules of Al₂( SO₄ ) there are 20 oxygen atoms are present. In one molecule of aluminum sulphate there are 4 oxygen atoms present and in 5 molecules of Al₂( SO₄ ) 20 oxygen atoms present.
What is molecule ?According to the environment, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by the attractive forces known as chemical bonds.
There are three different kinds of molecules: atom-sized molecules, element-sized molecules, and compound-sized molecules.
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all the substance's physical and chemical characteristics. Further atom division occurs within molecules.
Thus, In 5 molecules of Al₂( SO₄ ) there are 20 oxygen atoms are present.
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A student heats a LaTeX: 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) to CaO(s) + CO2(g)
Select one:
a) 1.4 g CaO
b)2.1 g CaO
c)2.5 g CaO
d)1.0 g CaO
Answer:
2.5
Explanation:
Hydrogen sometimes is “blank” an electron and sometimes it has an “blank” electron.
Hydrogen sometimes is missing an electron and sometimes it has an extra electron.
Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.
Because it has no neutrons in its nucleus, hydrogen (particularly hydrogen -1) is unusual. There is only one proton in the nucleus of hydrogen. The only element without neutrons is this one. Although it has a single electron orbiting its nucleus as well, hydrogen typically contributes this electron to form a single, positively charged proton instead.
Thus, Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.
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hey martin991 im sorry i just realized that was a dif account please forgive me plz help me and HAPPY NEW YEAR ♧
Energy stored in the bonds between atoms is called
A.kinetic energy.
B.mechanical energy.
C.chemical energy.
D.thermal energy.
Answer:
A. Kinetic energy
Explanation:
Kinetic energy is stored in the bonds between atoms.
how are molecules, mixtures, and pure substance related
Answer:
Pure substances are further broken down into elements and compounds. ... A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Explanation:
Dr. Murrays science class recently read about an experiment that had surprising results. The decided to perform the experiment in their class, but they used more advanced methods. Their results
The question is incomplete, the complete question is;
Dr. Murray's science class recently read about an experiment that had surprising results. They decided to perform the experiment in their class, but they used more advanced methods. Their results
must be completely different, but they are more reliable.
could be the same as before, or they could be completely different.
must be the same as the recorded results, but they are more reliable.
could be the same as the recorded results, or they must be inconclusive.
Answer:
could be the same as before, or they could be completely different.
Explanation:
Now we know that in carrying out a scientific research, there is such a thing as replication.
Replication means that other scientists in other places carry out the same experiments previously done and expect to obtain the same results as the first time the experiment was done.
However, this is not a case of replication because a different and more advanced method was used in the experiment. Once the methodology of the experiment has been changed, then the results could be the same or different. Hence the answer above.
2) If 100.0 J of heat are added to 20.0 g of water at 30.0°C, what will be the final
temperature of the water? What would the temperature be in Kelvin?
Which two body systems are most affected when a person is participating in a marathon running event?
A. endocrine and digestive
B. Endocrine and muscular
c. skeletal and digestive
d. skeletal and muscular
Answer:
d. skeletal and muscular
Cesium-133 has an atomic number of 55. It has
neutrons.
Answer:
The answer is 78
Explanation:
133 - 55 = 78
What is the balanced chemical equation for Benzoic acid + octanol ?
Answer:
C7H6O2+C8H17OH=C15H22O2+H2O
Explanation:
by reacting alcohol and acid we get ester and water
Dry hydrogen chloride was bubbled in methylbenzene and sodium carbonate added . Explain this observation.
Answer:
No observable change, unless dry hydrogen Chloride reacted in presence of a peroxide (ROOR)
Which statement describes why the viscosity of olive oil is higher than that of rubbing alcohol?
Answer:
D
Explanation:
Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.
What is viscosity?The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.
A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).
Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.
Thus the correct option is D.
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Who discovered phosphate?
Answer:
Hennig Brand
Explanation:
PLEASE HELP ME DO THIS ONE ITS DUE IN 5 MINUTES THANKS!! HAVE A GREAT DAY!!
Answer:
To persuade at any means necessary. Ex. I bribed a man with money.
Answer:
the underlined word is "bribes" which means you try to temp the gaurds to take money and in return you get something back. for example, i bribe someone with money to bring me a zebra from africa because its illiegal but you get persuaded with money to do it
Explanation:
If a sodium ion has 11 protons, 12 neutrons, and 11 electrons, what is the atomic mass of the atom?
Answer:
23
Explanation:
we do not care about electrons, so 11 + 12 = 23
Please help me!!!!!!!!!!!!!!
outline two methods used by designers to assemble packages
Answer:
Product packaging design refers to the production of a product's exterior. Develop an organization. All these specifics allow one to consider what the sealed substance is about how to use it, who can use it, and maybe, What do you sell? For your product, there are several different packaging forms available.
Explanation:
The chemical or mechanical processes by which rocks when exposed to the weather undergo changes in character and break down are called?
gravity sedimentation weathering magma
Answer:
weathering
Explanation:
the rocks due to rain generate cracks . heat and wind helps the rock to break into smaller chunks .
this process continuous till the rock is converted into sand. and is called weathering
Explain the horizontal periodic trend
Answer:
Trends on the Periodic Table have a vertical component and a horizontal component. Vertical trend: as more “shells” are added to the electron cloud, it expands. Horizontal trend: if atoms have the same number of “shells”, atoms with more protons will draw the electron cloud in tighter.
Explanation:
Why does the complete combustion of methane and octane produce the same product?E
Answer:
Because they are both of the same functional groups (alkane)
What kind of material will reduce the flow of heat energy?
what are the significance of chemical bond?
Explanation:
it helps to provide the energy which is necessary to hold two different atoms together as part of chemical compound.
How many atoms are in 2NaCHO2