Answer:
the answer is b
Explanation:
i just did quizz
Plz help! :D
What element is as hard as magnesium?
Answer:
Calcium
Explanation:
Im not 100% sure tho
Write this measurement in scientific notation: 0.000130 L
Answer:1.30 x 10 to the 4th
Explanation:
Just know
A compound has an empirical formula of CH2 and a molar mass of 56 g. What is its molecular formula?
O C5H10
O C4H8
O C3H6
O C2H4
Answer:
C4H8
Explanation:
First find the molar mass of CH2;
2(1.01) + 1(12.01) = 14.03g
Now divide the molar mass of the compound by the molar mass of CH2;
56g/14.03g = 3.9914 Round to nearest whole number = 4
Multiply CH2 by 4 to get the molecular formula;
CH2* 4 = C4H8
Answer:
C4H8
Explanation:
calculate the amount of grams each formula turns out to be
C5 = 60.05g well C5 is already larger than 56g so its not A
C4= 48.04g and H8= 8.08g, 48.04 + 8.08 = 56.12 so this is really close to our answer
C3 = 36.03g and H6= 6.06g, 36.03 + 6.06 = 42.09
C2 = 24.02g and H4 = 4.04g, 24.02 + 4.04 = 28.06
so the answer would be C4H8
What is this phenomenon called?
A.
codominance
B.
coinheritance
C.
incomplete dominance
D.
single gene dominant/recessive trait
Based on the results the students record, which group makes the most accurate measurements of the object?
Answer:
B.
Explanation:
It’s because when you subtract 78.5 and 77.5 you get 1. And when you do 79.5 and 78.5 you get 1 too. I know this because I got the answer right
If a compound is made up of more than one element why is it considered a pure substance? Choose 2 Group of answer choices The compound has different properties than the individual elements A compound can not be physically separated A compound can not be chemically separated A compound can be physically and chemically separated
Answer:
A compound can not be physically separated
Explanation:
A compound is a chemical substance that comprises of atoms of more than one element i.e. two or more elements are chemically combined to form a compound. However, as stated in this question, compounds are referred to as pure substances.
This reason is attributed to the fact that a compound cannot be physically separated i.e. the constituents of a compound cannot be separated using physical changes or methods. This is because the atoms of the constituent elements are combined or joined together by chemical bonds.
Answer:
Even though a compound can be made of two or more types of atoms, it is still a pure substance because the compound can be isolated, like salt or water.
Explanation:
Alexandra is preforming this combustion reaction i lab: C3H8 + 5O2 + 3CO + 4h20. If she carefully measures out 220 g of C3H8 and discovers she has produced 660 g of carbon dioxide and 360 g of water, how many grams of oxygen must have been required to react with the C3H8?
Answer:
800 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Next, we shall determine the masses of C3H8 and O2 that reacted from the balanced equation. This is illustrated below:
Molar mass of C3H8 = (12×3) + (8×1)
= 36 + 8
= 44 g/mol
Mass of C3H8 from the balanced equation = 1 × 44 = 44 g
Molar mass of O2 = 16 × 2 = 32 g/mol
Mass of O2 from the balanced equation = 5 × 32 = 160 g
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Finally, we shall determine the mass of O2 needed to react with 220 g of C3H8. This can be obtained as follow:
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Therefore, 220 g of C3H8 will react with = (220 × 160)/44 = 800 g of O2.
Thus, 800 g of O2 is needed for the reaction.
How many atoms are there in 4.13 moles of nickel (Ni)
Answer:
24.87× 10²³ atoms of Ni
Explanation:
Given data:
Number of atoms of Ni= ?
Number of moles of Ni = 4.13 mol
Solution:
we will calculate the number of atoms of Ni by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
4.13 mol × 6.022 × 10²³ atoms /1 mol
24.87× 10²³ atoms of Ni
Matter is anything with (1)
and volume. A (2)
is a form of
matter with a uniform and unchanging composition. Substances have specific, unchanging
(3)
that can be observed. Substances have both physical and chemical properties.
properties colate observed without changing a substance's chemical
composition. Color, hardness, and (5)
are examples. Other properties cannot be
observed without changing the composition of a substance. These are called (6)
properties
An example is the tendency of iron to form rust when exposed to air.
Matter is found all around us and is present in all substances in the universe. Substances have a uniform composition and changes in this composition of of a substance is called chemical reaction.
The appropriate words that fill in the blanks are;
1) Mass
2) Substance
3) Properties
4) Physical
5) Density
6) Chemical
Matter has mass and occupy space. Matter with a uniform and unchanging composition is called a substance.
Substances have physical and chemical properties. The physical properties of a substance such as density can be observed without changing the composition of the substance.
Chemical properties of a substance such as rusting can only be observed when the chemical composition of the substance is altered(chemical reaction).
Learn more: https://brainly.com/question/6284546
PLEASE HURRY (WILL MARK BRAINLIEST)
What happens when the sound waves released by a bat hit an object?
The sound waves are diffused.
The sound waves are reflected.
The sound waves are refracted.
The sound waves are absorbed,
Answer:
B.) The sound waves are reflected.
Explanation:
On edge,
i also answered so the other person could get the brainliest
Answer:
b
Explanation:
Please help me, I am struggling please help
Using the choices below, which is the complete symbol for the isotope that has the following subatomic particles: 19 protons, 21 neutrons, and 18 electrons.
(A: 40 19 K -1)
(B: 40 21 Sc +1)
(C: 38 19 K +1)
(D: 40 19 K +1)
(E: 39 18 Ar +1)
a. A
b. B
c. C
d. D
e. E
Answer:
Option D. ⁴⁰₁₉K⁺¹
Explanation:
The following data were obtained from the question:
Proton number = 19
Neutron number = 21
Electron number = 18
Complete symbol of isotope =.?
Next, we shall determine the atomic number of the isotope. This is illustrated below:
Atomic number of an element is simply the number of protons in the atom of the element. Thus,
Atomic number = proton number
Proton number = 19
Therefore,
Atomic number = proton number = 19
Since the atomic number of the isotope is 19, the isotope is simply potassium with symbol K.
Next, we shall determine the mass number of the isotope. This can be obtained as follow:
Proton number = 19
Neutron number = 21
Mass number =.?
Mass number = Proton + Neutron
Mass number = 19 + 21
Mass number = 40
Next, we shall determine the charge on the isotope. This can be obtained as follow:
Proton number = 19
Electron number = 18
Charge =.?
Charge = Proton – Electron
Charge = 19 – 18
Charge = +1
Summary:
Atomic number = 19
Mass number = 40
Symbol = K
Charge = +1
Complete symbol = ⁴⁰₁₉K⁺¹
Which technology is shown in the photograph?
A. Negative controls
B. Biostimulation reaction
C. Gel electrophoresis
D. Polymerase chain reaction
Answer:
C
Explanation:
Apex
Do you think MgO has a higher or lower
melting point than NaCl? Why?
Answer:
Magnesium Oxide (MgO) has a higher melting point than Sodium Chloride (NaCl) which is around 2,800 degrees Celcius. This is because its Mg2+ and O2- ions have a greater number of charges, and so form stronger ionic bonds, than the Na+ and Cl– ions in Sodium Chloride.
which way do heat flow
Answer:
Right side of the heart
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Explanation:
What happens to a solute?
A. It gets dissolved in something else.
B. It settles out of the solution.
C. It forms a solid in the solution.
O D. Something gets dissolved in it.
A solute gets dissolved in something else. (solvent)
What is a solute?A solute is a substance which dissolves in something else, like a solution. As a result, a homogeneous mixture is formed. A solute can be a gas, solid or a liquid.
What is a solvent?A solvent is a substance in which a solute happens to dissolve in order to produce a homogenous mixture. Solvents can also exist as solids, liquids as well as gases.
For example, NaCl is a solute which dissolves in water, which is a solvent. The equation is as follows
NaCl (aq) + H2O (l) → NaOH (aq) + HCl (aq)
Hence, option A is the correct option.
To learn more about solute and solvent here
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#SPJ2
what is called when a paragraph studies data carefully
✅Paraphrasing and summarizing .✅
IamSugarBee
Approximately how many joules of heat energy are released when 50 grams of water are cooled from 70°C to 60°C?
Answer:
Q = -2090 J
Explanation:
Given that,
Mass, m = 50 g
Water is cooled from 70°C to 60°C.
We need to find how many heat energy are released. Heat released is given by :
[tex]Q=mc\Delta T[/tex]
c is the specific heat of water, [tex]c=4.18\ J/g-C[/tex]
Putting all the values,
[tex]Q=50\times 4.18\times (60-70)\\\\Q=-2090\ J[/tex]
So, the heat energy released is 2090 J and negative sign shows heat is released.
Answer:
it is 2,100J
Explanation:
the density of titanium metal is 4.51 g/cm at 25°C. what mass of titanium displaces 125.0mL of water at 25°C?
Answer:
The answer is 563.75 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 125 mL = 125 cm³
density = 4.51 g/cm³
We have
mass = 125 × 4.51
We have the final answer as
563.75 gHope this helps you
How are the atoms in an object affected when the temperature of the object increases? *
They join together.
They vibrate faster.
They vibrate slower.
They split apart.
HURRY PLS!
A wave has a wavelength of 915 meters. what is the frequency of the light?
Answer:
327.8689 (Hz)
0.3279 (KHz)
0.0003 (MHz
0 (GHz)
Please answer quick
2. Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g ofSubstance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there is a small pile Substance A at the bottom of the first
beaker. None of Substance B is visible in the second beaker. Which of the following statements is true?
A. Substance A is less soluble in water than Substance B.
B. Substance A is more soluble in water than Substance B.
C. Substance A is not soluble in water,
D. Substance B is not soluble in water,
Answer:
A. Substance A is less soluble in water than Substance B.
Explanation:
Solubility: The term "solubility" is described as a specific property determining the capability of a particular solute, substance to get dissolve in a "solvent". Thus, solubility is being measured with respect to the "maximum amount" of a specific solute that is dissolved or mixed in a solvent at "equilibrium". After the given process, the resultant solution is referred to as a saturated solution.
In the question above, the correct answer is option-A.
PLZ ANSWER WILL GIVE BRAINLIEST ASAP
Given the data below, what substance does not show a reaction for any of the tests? Hint: (+)= reaction occurred, (-)= no reaction
unknown
salt
Corn starch
Gelatin
Answer:
Salt
Explanation:
It has all -
which element would most likely be a shiny solid at room temperature and a good conductor of electricity?
a. Co
b. I
c. F
d. Cl
Answer:
A
Explanation:
rest are nonmetals and they are not shiny
TRUE OR FALSE!!
All solids have a closely packed, fixed arrangement of particles.
A. True
B. False
this is a test, help!!
Answer:
false
Explanation:
jk true
1. The human eye can detect wavelengths of light as short as 0.000037 cm. What is this
wavelength in nanometers?
Answer:
0.000037 cm is 370 nanometers
Explanation:
Lewis diagrams of molecules of three different hydrocarbons are shown above. Which of the following claims about the molecules is best supported by the diagrams?
Answer:
D
Explanation:
Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.
What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third
What we can deduce from this is that these are alkanes , alkenes and alkynes
The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix
Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds
The correct claim about the molecules that best supports the diagrams is :
( D ) The strongest carbon to carbon bond occurs in molecule 3
The first molecule ( molecule 1 ) is an alkane because the molecule is made up of only single bonds connecting the carbon atoms.
while the second mole ( molecule 2 ) is an alkene because of the presence of a double bond connecting carbon atoms.
and the third molecule ( molecule 3 ) is an alkyne because of the presence of a triple bond connecting carbon atoms.
Therefore Alkynes have the strongest of of bonds between its carbon atoms because of the presence of a triple connecting carbon atoms.
Hence we can conclude that The strongest carbon to carbon bond occurs in molecule 3
Learn more about alkynes : https://brainly.com/question/22138155
As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction. Identify the scientific law that is of importance here. Explain why this is not true, and describe where the matter goes.
Answer:
Well we know that matter is neither created nor destroyed by chemical reactions or physical transformations. It is not destroyed it simply was converted to gas. =D
The scientific law that is of importance here is the 'Law of conservation of mass'.
The law of conservation of mass states that ' mass can neither be created nor be destroyed.In other words, a mass of an element before and after the chemical reaction remains the same.The airplane uses energy generated in the reaction of burning fuel to run the engine for movement.A fuel burned in an airplane had undergone a chemical reaction that converted fuel into a gaseous product.These gaseous products are then eliminated through exhaust from the airplane leaving the tank empty.No mass is destroyed during this process only conversion of mass took place.So, from this, we can conclude that the scientific law that is of importance here is the 'Law of conservation of mass'.
Learn more about the 'law of conservation of mass':
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What will the coefficients be for the following balanced equation? (a) N2 + (b) H2 → (c) NH3
Answer:
his reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.
N
+
H
→
N
H
3
We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to
N
2
+
H
2
→
N
H
3
Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.
We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.
N
2
+
3
H
2
→
2
N
H
3
This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.
I hope this was helpful.
Explanation:
Answer:
1N2 + 3H2 →2NH3
Explanation:
Plato answer
List and describe six forms of energy.
Answer:
Gravitational energy, electric energy, magnetic energy, nuclear energy, thermal energy, chemical energy.
Explanation:
gravitational energy - the energy resulting from the attraction of two masses to each other
electric energy - energy from a static or moving electrical charge.
magnetic energy - energy from the attraction of opposite magnetic fields, repulsion of like fields, or from an associated electric field
nuclear energy - energy from the strong force that bonds protons and neutrons in an atomic nucleus
thermal energy - also called heat, this is energy that can be measured as temperature. It reflects the kinetic energy of atoms and molecules
chemical energy - energy contained in chemical bonds between atoms and molecule
mechanical energy - the sum of the kinetic and potential energy
radiant energy - energy from electromagnetic radiation, including visible light and x-rays (for example)
