Answer:
When measuring a patient's height growth over 10 years
Explanation:
please help, i have my test today
(a) A carbon atom contains 6 electrons, 7 neutrons and 6 protons.
(i) State the mass number of this carbon atom
Answer:
carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12), so they are called carbon-12. Carbon atoms with 7 neutrons have an atomic mass of 13 (6 protons + 7 neutrons = 13). These atoms are the isotope called carbon-13.
an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
how was crude oil formed
Explanation:
Crude oil is formed from the remains of dead organisms (diatoms) such as algae and zooplankton that existed millions of years ago in a marine environment. As they lived these organisms absorbed energy from the sun and stored it as carbon molecules within their bodies.
Name:
ELEMENTS COMPOUNDS MIXTURES WORKSHEET
I. Fill in the Blanks:
1. A
can be either an element or compound.
2. A liquid in which the particles settle out is a
mixture called a
3. A substance which contains only one type of atom is an
4. Define matter
mixture also
5. When two or more substances are mixed evenly this is a
called
6. What are two differences between a compound and a mixture?
7. A
mixture is one in which particles or layers can be seen.
8. What are two things that element and compounds have in common?
9. A
separated by physical means, and a
can be separated by chemical means, a
can be
can't be separated by physical or chemical means
10. A
particles do not settle.
is a heterogeneous mixture that has particles farge enough to scatter light, but the
Answer:
Explanation:
coffe
A chemical equation is balanced when the number of each type of __________ is the same on both sides of the yield sign.
A.)Compound
B.)Molecule
C.)Formula
D.)Atom
Answer:
D. Atom
Explanation:
Isotopes of the same element have different numbers of what. a. Protons b. Neutrons. c. Neutrons and electrons d. Protons and electrons
Answer:
b. Neutrons
Explanation:
Isotopes of the same element have different number of neutrons. The number of neutrons is the determinant of an isotope.
Isotopes of an element have the same electronic configuration hence they have the same chemical properties.
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
The number of neutrons makes the difference in isotopes.
A machine have 75% efficiency,what does it mean.
Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. Fe + CuSO4 --> FeSO4 + Cu
b. H2O --> H2 + O2
c. H2O2 --> H2O + O2
d. Na + Cl --> NaCl
Answer:
A
Explanation:
This is the only reaction where a element is displaced out of a solution and turn a soild, due to it been less reactive than the other causing its displacement The electrochemical series can be used as reference.
What is this please
Answer:
it's c
Explanation:
convention cells
A certain type of stainless steel cookware has a layer of copper applied to the bottom to help it heat evenly. The copper transfers heat to the pan by
Answer:
Conduction
Explanation:
Conduction seems to be the mechanism whereby heat energy is transferred from adjacent molecules by interactions. In solids and liquids, where even the objects are near to each other, conduction happens more easily than in liquids, where even the molecules are farther separated.
Work is the only way which energy passes between system and surroundings.
O True
Tree
False
Answer:
true :)
Explanation:
Answer:
Explanation:
The First Law of Thermodynamics Work and heat are two ways of transfering energy between a system and the environment, causing the system’s energy to change. If the system as a whole is at rest, so that the bulk mechanical energy due to translational or rotational motion is zero, then the
How many molecules are there? How many elements? 5CO2
Answer:
No number means one atom. For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxygen and two atoms of hydrogen. A molecule can be made of only one type of atom.
Explanation:
A molecule is a group of two or more elements held together by chemical bonds. There are 5 molecules and 15 elements are present in the [tex]\bold {5 CO_2 }[/tex].
Molecule:
It is a group of two or more elements held together by chemical bonds. Molecules are electrically neutral.
For example- Carbon dioxide [tex]\bold {CO_2}[/tex], is composed of two elements Carbon and 2 oxygen atoms.
Here, the prefix 5, represents the number of molecules, hence there are 5 molecules of carbon dioxide are present.
So, there are 5 elements of carbon and 10 elements of oxygen. It means a total of 15 elements in the given molecules.
Therefore, there are 5 molecules and 15 elements are present in the [tex]\bold {5 CO_2 }[/tex].
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Prove Conservation of Mass
This is the combustion of pentane. How do I prove that there’s a conservation of mass? I can’t find a way to make it add up.
Answer:
2C5H12O+15O2→10CO2+12H2O
Explanation:
To prove the Law of Conservation of Mass, this equation is not balanced. To balance it, you need to show the work to find out how to balance it. To do that, You look at the C’s first and question are they balanced? They aren’t so you add a CO2 and continue that process until it’s balanced for each element.
Luke's collection has 27 postcards in it than brian's collection. Put togteher, their collections have 135 postcards how many postcards does luke have how many postcards does brian have
Answer:
I. Luke has 81 postcards.
II. Brian has 54 postcards.
Explanation:
Let Luke's collection be L
Let Brian's collection be B
Translating the word problem into an algebraic equation, we have;
L = 27 + B
L + B = 135
Substituting equation 1 into equation 2, we have;
27 + B + B = 135
27 + 2B = 135
2B = 135 - 27
2B = 108
B = 108/2
B = 54
Therefore, Brian has 54 postcards.
To find the value of L;
L = 27 + B
L = 27 + 54
L = 81
Therefore, Luke has 81 postcards
WILL GIVE BRAINLIEST!! :)
Nitrogen is a critical component of what organic compounds?
a.) lipids and carbohydrates
b.) lipids and DNA
c.) proteins and carbohydrates
d.) proteins and DNA
Answer:
D
Explanation:
Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.
Nitrogen is a critical component of proteins, which are building blocks and DNA, which are the main genetic material of our body.
What are organic compound?Those compounds which are formed by the combination of carbon, hydrogen, oxygen and nitrogen through covalent bonds are known as organic compounds.
Proteins are the large macromolecules which are present in the human body, formed by the combination of large no. of amino acids and main constituent of this acids is nitrogen. Similarly, DNA is the main genetic material in our body formed by the combination of nucleic acid and its main component is also nitrogen.
Hence, Nitrogen is a critical component of proteins and DNA.
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What nonmetal gains 3 electrons to be stable like neon?
Help me answer this question
How many stages are in each phase of the cell cycle?
Answer:
The cell cycle is a four-stage process in which the cell increases in size (gap 1, or G1, stage), copies its DNA (synthesis, or S, stage), prepares to divide (gap 2, or G2, stage), and divides (mitosis, or M, stage). The stages G1, S, and G2 make up interphase, which accounts for the span between cell divisions
how many molecules are contained in 201 g of magnesium sulfate heptahydrate?
Answer:
Its not 1.01x10^24
Explanation:
I am not sure why I got it wrong but when I put the answer in, it said it what wrong. Lol do you have Mr.Hays??
Answer:
4.91 • 10^23
Explanation:
201 • 6.02 • 10^23 ÷ 246
i used that formula and go it right i’m also in mr hays class lol .
Which statement is a description of a chemical reaction?
• A solid is dropped into a beaker of liquid and a gas is released.
• Two liquids are mixed in a beaker and a solid form at the bottom of the beaker.
A solid is dropped into a beaker of liquid and an explosion occurs.
Can someone help please
Answer:
1. 252.535
2. 790.830
3. 8,730,000 atoms
4. 4.0 x 10^-9 mol
5. one mole of mole of water contains 6.02 x 10^23
Explanation:
hope you like it... :)
What is the difference between the outer shell of sodium and the outer shell of fluorine?
The outer shell (the outermost shell) of Na there is 1 electron while in F there are 7 electrons
Further explanationGiven
Sodium and Fluorine
Required
The outer shell difference
Solution
Sodium (symbol Na) is an element in group 1 (alkaline) which has the atomic number 11
So the electron configuration is: [Ne] 3s¹
Meanwhile, Fluorine (symbol F) is a halogen element (group 17) which has atomic number 9
So the electron configuration is: [He] 2s² 2p⁵
If we look at the electron configurations of these two elements, it shows that the element Na to achieve its stability will release 1 electron in the outer shell so that it has an electron configuration like Ne
Meanwhile, Fluorine will need 1 more electron so it can be stable like Ne
So in the outer shell of Na there is 1 electron while in F there are 7 electrons
paulina is heating a test tube in a lab. which tool is she most likely using?
Answer:
what's the options to choose from
Which is the most common category of elements on the periodic table?
A.non-metals B.metalloids C. semi-metals D.metals
Answer:
D.metals
Explanation:
The majority of elements in the periodic table are classified as metals.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option D s correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
The majority of elements in the periodic table are classified as metals. Then the number of non metals come then the metalloids. Metals are kept on the left of the periodic table.
Therefore, the correct option is option D that is metals.
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What is the effect of thermal energy on the atoms/molecules in a sample of matter?
Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
Answer:
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
How many moles is 125 g CuO2?
Answer:
1.31moles
Explanation:
Given parameters:
Mass of CuO₂ = 125g
Unknown:
Number of moles = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CuO₂ = 63.6 + 2(16) = 95.6g/mol
So;
Number of moles = [tex]\frac{125}{95.6}[/tex] = 1.31moles
What is the charge that a nitrogen ion will form and explain
Answer:
A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−. The symbol for the ion is N3−, and it is called a nitride ion.
Please help fast, I will give brainliest!
Answer:
4.0 mol
Explanation:
Which observation would most likely indicate that an endothermic reaction has occurred? O A. a color change O B. the production of gas bubbles O C. an increase in temperature OD. a decrease in temperature
Answer:
The temperature decreases
Explanation:
It decreases because an endothermic reaction absorbs heat so it would make sense if it were lower temperature.
The observation which would most likely indicate an endothermic reaction is
a decrease in temperature.
Endothermic reaction involves the absorption of heat from it surroundings
while exothermic reaction involves the release of heat into the
surroundings(environment).
Endothermic reaction involving absorption of heat from the surroundings will result in a decrease in the temperature which depicts that it has occurred.
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Which of the following reactions is an example of a single replacement reaction?
Select one:
a. C2H6 + O2 --> CO2 + H2O
b. HgO --> Hg + O2
c. CuCl2 + Al --> Cu + AlCl3
d. NO + O2 --> NO2
C5H12() + 502(9)=
5CO2(g) + 6H2(9)
A. Decomposition
B. Combustion
C. Neutralization
D. Precipitation
