When a substance changes from one phase to another which of the following occurs
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.
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:
https://brainly.com/question/2175724
Radiation _____.
Occurs is solids.
Occurs in liquids.
Requires physical contact between molecules
Is the method of heat transfer used by the sun
Answer:
Option (d) is the correct answer.
Explanation:
Radiation is defined as electromagnetic energy that travels in space in the form of waves or particles. This means that heat energy will always travel from a warmer object to a colder object. For example, radiations coming from the Sun are able to transfer heat energy to the substance on which they fall. Thus, we can conclude that radiation is the method of heat transfer used by the Sun.
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.
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
How do solids and liquids compare with each other?
O A. Solids change volume to match their containers, but liquids do
not.
B. Liquids change volume to match their containers, but solids do
not.
C. Liquids change shape to match their celtainers, but solids do not.
D. Solids change shape to match their containers, but liquids do not.
Answer:
C
Explanation:
I do not really have an explanation... But I took the test on a.p.e.x...
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.
I don’t understand what I am supposed to do with this
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.
Learn more about atom here:
brainly.com/question/1566330
#SPJ2
Atomic theory helps us explain many things about the universe. Which of the following is a part of atomic theory? (A)Atoms can be seen with the naked eye. (C) Atoms always move faster than the speed of light. (B)Atoms are the most massive objects in the universe. (D)All matter in the universe is made up of atoms. (10 points)
Answer:
D
Explanation:
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.
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.
What mass of HCl (in Kg) is required to create 8.80 Liters of hydrogen gas?
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
How can air pollution affect plants?
Answer:
yes air pollution can affect a plants health
Explanation:
Name a sensory organ, and briefly explain its function.
Answer:
Eyes are sensory organs because sight is one of the major senses. Eyes process light, allowing us to differentiate colors and shapes to create an image of the surrounding environment.
Explanation:
Edmentum Sample Answer
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:
brainly.com/question/26416088
#SPJ2
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
Atoms are indivisible spheres.
Answer:
urm is that an answer lol
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:
3 waves are shown with a line through their center. The bottom of the first wave is labeled C. A bracket labeled D connects the bottom of the second and third waves. A line from the center to the top of the first wave is labeled A. The line leading to the top is labeled B.
Label the parts of this wave.
Answer:Label the parts of this wave.
A:
✔ crest
B:
✔ amplitude
C:
✔ trough
D:
✔ wavelength
Explanation:
Answer:
A- crest
B- Amplitude
C- Trough
D- wavelength
Explanation:
Just did it on Edge Trust me 2022
someone help me with this rly quick
105006hm/ds to. m/s
convert and show the works
Answer:
10500600m/s
1ds=100m/s
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!
Which group in the periodic table is known as the as the noble gases?
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.
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
Mohs hardness strontium
Answer: 5.5
Explanation: Strontium titanate is both much denser (specific gravity 4.88 for natural, 5.13 for synthetic) and much softer (Mohs hardness 5.5 for synthetic, 6–6.5 for natural) than diamond.
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 :)
Both the nucleus and the vacuole have membranes that isolate the material inside them from the rest of the cell. Which of the following best describes why both organelles have membranes?
A.
The nucleus protects food, and the vacuole protects cytoplasm.
B.
The nucleus protects genetic material, and the vacuole protects food.
C.
The nucleus and the vacuole both protect genetic material.
D.
The nucleus protects water, and the vacuole protects waste.
Answer:
B
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.