Answer:
chemical reaction
Explanation:
i think i have tried
Answer:
The substance's heat changes.
Explanation:
Substances can be made to change phases by fluctuating the temperature, the pressure, or both.
I need help with this question! Can someone answer it for me? thank you!
Answer:
One Valence Electron
Explanation:
It is classified as an alkali metal. Potassium atoms have 19 electrons and 19 protons with one valence electron in the outer shell. Potassium is considered chemically similar to sodium, the alkali metal above it on the periodic table. Under standard conditions potassium is a soft silvery-white metal.
DESPERATE WILL GIVE BRAINLIST AND THANKS
The half-life of an element is 150 years. If a 40-gram sample was originally deposited, how much is left
after 300 years?
Question 4 options:
30 grams
20 grams
10 grams
5 grams
Answer:
20 grams
Explanation:
40g= 300
x = 150
cross multiply, 40*150/300
6000/300= 20g
A student has 0.75 L of a 5.0 M solution and dilutes it to make 3.5 liters. What’s the molarity of the diluted solution?
1.1 M
2.0 M
1.6 M
.93 M
The molarity of the diluted solution : 1.1 M
Further explanationDilution is the process of adding solvent to get a more dilute solution.
The moles(n) before and after dilution are the same.
Can be formulated :
[tex]\tt n_1=n_2\\\\M_1.V_1=M_2.V_2[/tex]
M₁ = Molarity of the solution before dilution
V₁ = volume of the solution before dilution
M₂ = Molarity of the solution after dilution
V₂ = Molarity volume of the solution after dilution
M₁=5
V₁=0.75
V₂=3.5
[tex]\tt M_2=\dfrac{M_1.V_1}{V_2}\\\\M_2=\dfrac{5\times 0.75}{3.5}\\\\M_2=1.07\approx 1.1[/tex]
Which equation illustrates conservation of mass?
A) H2 + Cl2 - HCI
B) H2 + O2 + H20
C) H2 + O2 + 2H2O
D) H2 + Cl2 - 2 HCI
The equation that has been following the law of conservation has been [tex]\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl[/tex]. Thus, option D is correct.
The law of conservation of mass states that in a chemical equation, the atoms of reactants and atoms of products for each elements are equal.
In the given reactions,
A. [tex]\rm H_2\;+\;Cl_2\;\rightarrow\;HCl[/tex]
The equation has 2 atoms of hydrogen and chlorine at reactant side, while 1 atom on product side. Thus, the equation does not follow the law of conservation.
B. [tex]\rm H_2\;+\;O_2\;\rightarrow\;H_2O[/tex]
The equation has 2 atoms of hydrogen and oxygen at reactant side, while 1 atom on product side. Thus, the equation does not follow the law of conservation.
C. [tex]\rm H_2\;+\;O_2\;\rightarrow\;2\;H_2O[/tex]
The equation has 2 atoms of hydrogen and oxygen at reactant side, while 2 atoms of oxygen and 4 atoms of hydrogen on product side. Since, the equation has imbalanced hydrogen it does not follow the law of conservation.
D. [tex]\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl[/tex]
The reaction has 2 atoms of hydrogen and chlorine at reactant side, and 2 atom of each on product side. Thus, the equation does follow the law of conservation.
The equation that has been following the law of conservation has been [tex]\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl[/tex]. Thus, option D is correct.
For more information about the conservation of mass, refer to the link:
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HELP ME ASAP
Samantha and Claire determined the mass and volume of a piece of metal to be 24.16 g and 3.22 mL respectively. Determine the density of the metal.
Answer:
7.5031055900621
Explanation:
D= M/V
Which model is based on Bohr's quantum model?
Model A
Model B
Model C
Model D
Answer:
Model D
Explanation:
Bohr's Model has a planetary look. Where the electrons are in an orbit.
Answer:
The answer is model D
what do punnet squares do
Answer:
The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. ... The diagram is used by biologists to determine the probability of an offspring having a particular genotype.
Explanation:
in biology it predicts the possible offspring provided the features of the mother or father
If the half-life of an element is 150 years, how much of a 400 gram sample would remain in 750 years?
Answer:
y
Explanation:
if something weighs 66 pounds on earth how much does it weigh on the moon
Answer:
about 12 pounds
Explanation:
Answer:
10.91 pounds
Explanation:
That is because an object or person on the moon would weigh 16.5% its weight on earth.
Genesis lays an object on the table in a well-lighted room the object absorbs all visible light waves what color object does genesis see?
Answer:
The object Genesis sees is black.
Explanation:
The color an object reflects represents what the object's color is. For example, if a block reflects blue light, then only blue light is sent to our eyes, and hence we see the block as blue.
If an object absorbs all visible light waves, then, that means there's no visible light reflected, and we cannot see any color the object has. Hence, it is black in our eyes.
Hope this helped!
23) Assuming STP, how many moles are in 30 L SO2?
Answer:
1.34 moles SO₂(g)
Explanation:
At STP 1 mole of any gas occupies 22.4 Liters. So, for 30 Liters ...
moles SO₂(g) = 30L/22.4L·mol⁻¹ = 1.34 moles SO₂(g)
PLEASE HELP
WILL GIVE BRAINLIEST
If 175.0g of nitrogen is reacted with 250.0g of hydrogen, what is the theoretical yield of the reaction? What is the excess reactant? What is the limiting reactant? Show your work.
Answer:
Nitrogen gas is the limiting reactant
Hydrogen gas is the excess reactant
The theoretical yield is 425 g of ammonia
Explanation:
Equation of reaction: 3H2 + N2 ---> 2NH3
From the equation of reaction, 3 moles of hydrogen gas reacts with 1 mole of nitrogen to produce 2 moles of ammonia gas.
Molar mass of hydrogen gas = 2.0 g
Molar mass of nitrogen gas = 14.0 g
Molar mass of ammonia gas = 17.0 g
Number of moles of hydrogen gas in 250 g = 250/2 = 125 moles
Number of moles of nitrogen gas in 175 g = 175/14 = 12.5 moles
Mole ratio of Hydrogen to Oxygen = 125/12.5 = 10 : 1
Therefore, nitrogen gas is the limiting reactant.
Hydrogen gas is the excess reactant
14 g of nitrogen gas produces 17 × 2 g of ammonia = 34 g of ammonia
175 g will produce (34 × 175)/14 = 425 g of ammonia
Therefore the theoretical yield is 425 g of ammonia
What causes objects to speed up, slow down, and change directions?
Besides being classified by their composition, how else are rocks classified?
a.
by their texture
c.
by their color
b.
by their mass
d.
by their volume
Answer:
A. By their texture
Explanation:
Rocks can be classified their texture.
Atoms are indivisible spheres.
Answer:
urm is that an answer lol
Hayley is at the beach. She applies sunscreen to her skin to protect it from which energy from the Sun? visible light infrared radiation ultraviolet radiation thermal energy
Answer:
(C) Ultraviolet Radiation
Explanation:
Answer:
The correct answer is ( C- ultraviolet radiation )
Explanation:
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays.
Which group in the periodic table is known as the as the noble gases?
what would be the theoretical yield of 2SO2 + O2 + 2H2O --> 2H2SO4
Answer:
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Explanation:
How would one make a 2 M solution of a compound?
O A. By dissolving 1 molar mass of the compound in 2L of water
OB. By dissolving 2 moles of the compound in 1 L of water
Oc. By dissolving 2 g of the compound in 1 L of water
D. By dissolving 1 mole of the compound in 2 L of water
Answer:
B. By dissolving 2 moles of the compound in 1 L of water.
Answer:
b
Explanation:
a pe x :)
How can air pollution affect plants?
Answer:
yes air pollution can affect a plants health
Explanation:
You react 14.5 grams of sodium hydroxide with 14.5 grams of copper II sulfate. At the end of the lab you find that you recovered 7.99 grams of precipitate. When you write the balanced equation for you reaction, what is the coefficient in front of sodium hydroxide?
Answer: The coefficient in front of sodium hydroxide is 2.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
the balanced reaction between sodium hydroxide and copper (II) sulphate is :
[tex]2NaOH+CuSO_4\rightarrow Na_2SO_4+Cu(OH)_2[/tex]
Thus the coefficient in front of sodium hydroxide is 2.
How many moles of no are produced from a reaction if it’s mass is 2.05
Answer:
6.83 × 10^–2 mol NO
Explanation:
The number of moles of nitric oxide NO produced from a reaction if its mass is 2.05 is equal to 0.0683 mol.
What is a mole?A mole is represented by the symbol mol and can be defined as a scientific unit that is used to measure the amount of the substance. The substance can commonly be chemical entities but they are individually distinct.
A mole of the substance can be used to evaluate a large number of constituent particles. The amount of substance can be measured in terms of chemical entities of a substance in a sample.
The number of elementary units in 1 mole of a substance is equal to 6.023×10²³ which is called Avogadro’s constant.
Given, the mass of the Nitric oxide, NO = 2.05 g
The mass of one mole of Nitric oxide, NO = 30 g
We can calculate moles of the substance as, n = Mass/molar mass
Then, the number of moles of Nitric oxide, NO = 2.05/30 = 0.0683 mol
Therefore, the number of moles of Nitric oxide, NO is 0.0683 mol.
Learn more about the mole, here:
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How does carbon (C) differ from silicon (Si)?
A) carbon has 1 less electron energy shell than silicon
B) carbon has 1 less electron than silicon
C) carbon has 8 more electron energy shells than silicon
D) carbon has 1 more proton energy shell than silicon
Explanation:
carbon has 1 less electron energy shell than silicon
Carbon has 1 less electron energy shell than silicon. Hence, option A is correct.
What is an atom?An atom is any particle of matter which contains at least one proton.
Carbon is a nonmetal but silicon is a metalloid. Carbon and silicon belong to the same group (group 14) of the periodic table. And have four electrons in the outer energy level. Both occur in two oxidation states, +2 and +4.
Hence, option A is correct.
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I don’t understand what I am supposed to do with this
Which of the following would most likely make up a team of scientists?
OA. Younger people from educated families
B. People with the same perspectives but from different
backgrounds
OC. People with different experiences and backgrounds
OD. Older men with similar opinions
Answer:
I would go with C
Explanation:
Because if in a group of scientists, the people that are educated with different experiences will be helpful to invent a new thing by giving their own ideas and mixing them.
Hope i got to be Helpful!
4. milk turning sour
Is the change physical or chemical?
Why do you thinks so? (2-3 reasons/indicators)
Answer:
Chemical change
Explanation:
Hi again. The lactose in the milk is converted to lactic acid by microbes. It has turned into a new substance that is irreversable.
The number of protons + number of neutrons is
equal to the
Answer: mass
Explanation: the protons and neutrons make up the nucleus and nearly the entire mass of the atom
When 33 g of CaO and 10 g of H2O react, how many grams of calcium hydroxide would you expect to be produced* Explain your answer.
Answer:
Calculate the number of moles of oxygen required to react exactly with 4.30 ... How many moles of NH3 can be made from 2.00 moles of Nz if you have excess Hz? ... 10. How many grams of water are made when 3.00 moles of butanol is combusted? ... If 50.0 g of calcium oxide were produced, how many grams of calcium ...
Answer:
41.44 g
Explanation:
First of all, we must put down the equation of the reaction;
[tex]CaO + H2O ----->Ca(OH)2[/tex]
Number of moles of CaO = 33g/56 g/mol = 0.59 moles
Number of moles of H20 = 10g/18 g/mol = 0.56 moles
Since the reaction is in 1:1 mole ration, H2O is the limiting reactant
Hence;
mass of Ca(OH)2 produced = 0.56 moles * 74 g/mol = 41.44 g
a speed-time graph which the displayed data forms a straight line is a example of?
Answer:
constant speed or a horizontal line is an rest
Explanation:
What is the mass of a 10 gram sample of potassium-42 that will remain unchanged after 12.4 hours
Answer:
ok
Explanation:
I accutly don't know the answer sorry