Name 3 elements that are found in the human body
Answer:
oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
Explanation:
the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
An independent variable is
a.
directly changed by the experimenter.
b.
manipulated by changes to the dependent variable.
C.
a variable that is kept constant.
d.
a variable that is used as a control.
Answer:
a. directly changed by the experimenter.
Explanation:
In the case of mathematical modeling, analytical modeling , and experimental sciences, the number of dependent variables based upon the amount of independent variables.
The dependent variables represent the result or outcome whose changes is being determined.
An independent variable expressed in the name form like experimental or expected variable, is a variable i.e. created in an experiment in order to verify the effect on a dependent variable
Therefore the option a is correct
An atom of an element always contains
Answer:
An atom of an element always contain three fundamental particles called electrons(e-) , neutron ( n zero) and protons ( p+)
An atom of an element always contains a proton, electron and neutron.
What is an atom ?Every atom is made up of a nucleus and one or more electrons that are attached to the nucleus. One or more protons and a number of neutrons make up the nucleus. Only the most common type of hydrogen is neutron-free. Every solid, liquid, gas, and plasma is made up of atoms that are either neutral or ionized.
But when it comes to the word atom, we must go back to 400 B.C. Greece. And Democritus, a brilliant philosopher, proposed the Greek word atomos, which means uncuttable.
Every atom is made up of a nucleus and one or more electrons that are attached to the nucleus. One or more protons and a number of neutrons make up the nucleus.
Thus, An atom of an element always contains a proton, electron and neutron.
To learn more about an atom, follow the link;
https://brainly.com/question/29695801
#SPJ2
The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction?
Answer:
Redox type
Explanation:
The reaction is:
2Cr + 3Fe(NO₃)₂ → 2Fe + 2Cr(NO₃)₃
2 moles of chromium can react to 3 moles of iron (II) nitrate in order to produce 2 moles of iron and 2 moles of chromium nitrate.
If we see oxidation state, we see that chromium changes from 0 to +3
Iron changed the oxidation state from +2 to 0
Remember that elements at ground state has 0, as oxidation state.
Iron is being reduced while chromium is oxidized. Then, the half reactions are:
Fe²⁺ + 2e⁻ ⇄ Fe (Reduction)
Cr ⇄ Cr³⁺ + 3e⁻ (Oxidation)
When an element is being reduced, while another is being oxidized, we are in prescence of a redox reaction.
Which of these forces does not act over a distance?
A. Friction
B. Electric
C. Magnetic
D. Gravitational
What’s is CO written?
Answer:
CO is a chemical formula that contains one carbon atom (C) and one atom of oxygen (O). Altogether, CO translates to "carbon monoxide."
Explanation: Why monoxide and not dioxide? Well, the prefix mono means "one," and di means "two." Since there is only one oxygen atom (-oxide), then it must be monoxide! Voila!!
-->
Give the products of this neutralisation reaction: Sulfuric acid + magnesium hydroxide
Magnesium combined with sulfuric acid produces magnesium sulfate and hydrogen gas.
Which is an example of a medicine that is made up of synthetic materials?
Fish Oil
Aspirin
Aloe Vera
Fresh water
Answer: Aspirin
Explanation:
What do u mean by electronic configuration? What are basic requirements while writing electronic configuration of an element (atom) ?
The basic requirement while writing the electronic configuration of an element (atom) is its atomic number.
Explanation:
The electronic configuration of an element is the distribution of its electrons in different energy levels around the atomic nucleus.It only requires an atomic number of an element to write its electronic configuration.The atomic number is equal to the number of protons in an atom and that is equal to the number of electrons.And the filling of electrons is done according to the Aufbau principle, the electrons will be first filled in the atomic orbitals with lower orbital energy before filling the atomic orbital with higher energy.The sequence of the atomic orbitals from lower energy to higher energy is:[tex]1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d...[/tex]
For example:
The atomic number of gallium is 31, its electronic configuration will be:
[tex][Ga]=1s^2 2s^2 2p^63s^2 3p^6 4s^2 3d^{10} 4p^1[/tex]
Learn more about an electronic configuration of an atom here:
brainly.com/question/11628377
brainly.com/question/18444398
what does 3 hour change mean?
Answer:
like what happens In 3 hours
What is the mass, in amu, of an atom with one proton and two neutrons?
mass of proton mp=1.672621898e-27 kg and 1 amu=1.66053904e-27kg so it’s just divition (1.672621898e-27 / 1.66053904e-27) =1.007276 amu
Answer:
hi
Explanation:
hi
Four major bahiagrass varieties
Carbon is one of a few elements that bonds to itself. The scientific term for this is
Answer:
Alkanes
Explanation:
Explanation:
The answer is Alkanes.Alkanes are compound that consists entirely of atoms of carbon and hydrogen joined to one another by single bonds
what phase of matter changes volume when moved from one container to another ?
Answer:
gas
Explanation:
Gas
Explanation:
The volume of gas varies inversely with the pressure, when temperature is kept constant.
If the amount of gas in a container is increased, the volume increases. If the amount of gas in a container is decreased, the volume decreases.
what is atomic number of sodium
Answer:
Explanation:
Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.
Answer: Atomic number for sodium is 11
Symbol: Na
Melting point: 207.90°F (97.72°C)
The electronic configuration of sodium is 2, 8, 1
Please help me with dis
Answer:
c
Explanation:
3) Find the mass, in grams, of 5.08 mol Ca(NO3)2
Answer:
833.12g
Explanation:
Use the mole=mass/mr equation (rearrange this to find mass)
Mr= 164
So, 5.08 x 164 = 833.12g
The mass in grams of 5.08 mol Ca(NO3)2 is =833.12g
What is a mole?
The mole is the amount of substance of a gadget which includes as many standard entities as there are atoms in zero.012 kilogram of carbon 12;
Molecular mass of Ca(NO3)2 = 40+(14+48)*2
=40+124
= 164 g
1 mole of Ca(NO3)2 = 164 g
5.08 mole of = 5.08*164g
=833.12g
Learn more about mole here:-https://brainly.com/question/15356425
#SPJ2
Can you help me plz I think it’s b or c
i think its C pls dont get mad if it is wrong
9. Good insulator should be
(a) Fire proof
(b) Chemically inert
(c) Odourless in use
(d) All of the above
Ar
Answer:
A fire proof
Explanation:
I hope this is help
Can you bond 2 silicon atoms (Si) together to form a complete (real) molecule? Explain your reasoning
Answer: no
Explanation: because silicon cannot share over 3 bonds
What is the percent composition of each element in the compound below:
CrPO4
If combining cation A with a +3 charge and anion X with a -3 charge, how would we write the compound?
O AX
O A3X3
O 3AX
Answer: it’s not A3X3
Explanation:
1. AX
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.If a cation A carries +3 charge and an anion X carries -3 charge, the compound so formed is AX. Since the charges gets cancelled out.For example: consider aluminum phosphate, aluminum carries +3 charge and phosphate carries -3 charge, the molecular formula for the compound will be AlPO₄.Learn more:
brainly.com/question/11164440
please help! Will give Brainliest!
Answer: the answer is c
Explanation:
also, is that canvas? sajdasds
PLZ HELP WILL BRAINLIEST
Balance the following equation: Fe2(SO4)3 + KOH --> K2SO4 + Fe(OH)3
Write the coefficients that you decide to balance the equation like this 3, 4, 3. If you do not add a coefficient in front of an element or compound, use a 1 in your answer. For instance the for this balanced equation: 2H2 + O2 --> 2H2O you would write your answer: 2, 1, 2
Answer:
6,3,2
Explanation:
Fe2(SO4)3 + 6 KOH = 3 K2SO4 + 2 Fe(OH)3
Think of the of the body that we need in order to do things like walk, run etc. What systems are these? How do they work together so you can do these activities?
Answer:
I dont get this
Explanation:
Science activity 1.4.2
How many moles of carbon dioxide are produced when 5.12 moles of glucose undergoes a combustion reaction?
Answer: 30.72 moles of [tex]CO_2[/tex] will be produced from 5.12 moles of glucose.
Explanation:
The balanced chemical equation for combustion of glucose is:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
According to stoichiometry :
1 moles of glucose produce = 6 moles of [tex]CO_2[/tex]
Thus 5.12 moles of glucose produce =[tex]\frac{6}{1}\times 5.12=30.72moles[/tex] of [tex]CO_2[/tex]
Thus 30.72 moles of [tex]CO_2[/tex] will be produced from 5.12 moles of glucose.
Can anyone help me with this algebraic expression
(4a+3b)² (3a-4b)²
Answer:
=144a⁴−168a³b−239a²b²+168ab³+144b⁴
Explanation:
=144a⁴−168a³b−239a²b²+168ab³+144b⁴
Answer:
[tex](4a + 3b)(4a + 3b)(3a - 4b)(3a - 4b) \\ {16a}^{2} + 12ab + {9b}^{2} + 12ab + {9a}^{2} + 12ab + 12ab + {16b}^{2} \\ {16a}^{2} + {9a}^{2} + {9b}^{2} + {16b}^{2} + 12ab + 12ab + 12ab + 12ab \\ {25a}^{2} + {25b}^{2} + 48ab[/tex]
If I had 50 graham cracker squares, 15 marshmallows, and 100 little
chocolate pieces, how many total s'mores could I make before I ran out of
ingredients?
1 point
When substances that make up baking powder are mixed with water,
carbon dioxide gas is formed. This is an example of *
a nuclear reaction
a physical reaction
a change of state
a chemical reaction