What classifies something as a chemical reaction?
Answer:
changes that change the matter of the object and made it into another object
Explanation:
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:
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
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?
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)
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:
I don’t understand what I am supposed to do with this
someone help me with this rly quick
105006hm/ds to. m/s
convert and show the works
Answer:
10500600m/s
1ds=100m/s
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 :)
Which option identifies why Tony does NOT purchase the strawberries in the following scenario?
Tony checks the Country of Origin label before purchasing organic strawberries and decides against buying them when he sees they
came from Chile.
He is not sure the strawberries are organically grown
O He does not believe the strawberries are fresh.
He only purchases strawberries grown locally
He is not sure of the strawberries' nutritional content
Answer:
He only purchases strawberries grown locally.
Explanation:
Based on the information we are given, this is the only reasonable answer.
Answer :He only purchases strawberries grown locally.
Explanation: The correct answer is He only purchases strawberries grown locally. Many consumers have preferences as to where their food comes from. Some want to avoid products that have been shipped extensively and prefer to purchase locally produced goods and services. Country of Origin labeling does not indicate whether a product is organic, its nutritional content, or whether it is fresh, and a consumer would need to determine this information another way.
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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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
Which of the following biogeochemical cycles uses the reaction 2N2 + 6H20 --> 4NH3 + 302? (3 points)
The nitrogen cycle
The carbon cycle
The water cycle
The phosphorus cycle
Answer:
phosphorus cycle
Explanation:
the phosphorus cycle because 302 equals to it
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.
What causes objects to speed up, slow down, and change directions?
Atoms are indivisible spheres.
Answer:
urm is that an answer lol
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.
what contribution to atomic theory resulted from albert einstein’s work?
Answer:
Albert Einstein is perhaps most famous for introducing the world to the equation E=mc2. In essence, he discovered that energy and mass are interchangeable, setting the stage for nuclear power—and atomic weapons. His part in the drama of nuclear war may have ended there if not for a simple refrigerator.
Explanation:
Albert Einstein is perhaps most famous for introducing the world to the equation E=mc2. In essence, he discovered that energy and mass are interchangeable, setting the stage for nuclear power—and atomic weapons. His part in the drama of nuclear war may have ended there if not for a simple refrigerator.
The contribution to atomic theory resulting from Albert Einstein's work is A new understanding that the nucleus contains protons and neutrons.
Albert Einstein's work contributed to the development of the theory of relativity, which had profound implications for our understanding of the structure of atoms. Through his work, it became clear that the nucleus of an atom contains positively charged protons and electrically neutral neutrons. This understanding of the composition of the atomic nucleus was a significant advancement in atomic theory.
While Albert Einstein made significant contributions to physics and our understanding of the universe, the specific discoveries mentioned in the other answer choices were made by other scientists and not directly attributed to Einstein.
Hence, the correct option is option b.
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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
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.
what would be the theoretical yield of 2SO2 + O2 + 2H2O --> 2H2SO4
Answer:
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ﾟ you are the Impostor. 。 .
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Explanation:
11. Do the blue dots on the graph represent an object that
sinks or floats in the water? How do you
know?
a. Floats because the blue dots are all
above the line with a slope of 1 g/mL.
b. Floats because the blue dots are all
below the line with a slope of 1 g/mL.
c. Sinks because the blue dots are all above
the line with a slope of 1 g/mL.
d. Sinks because the blue dots are all below
the line with a slope of 1 g/mL.
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
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.
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!
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
The volume of water in a graduated cylinder was increased from 52.0 mL to 75.5 mL when a piece of irregular metal was placed in the water. If the piece of metal has a mass of 265.6 g, what is the density of the metal?
Answer:
11.30 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
volume = final volume of water - initial volume of water
volume = 75.5 - 52 = 23.5
From the question we have
[tex]density = \frac{265.6}{23.5} \\ = 11.302127...[/tex]
We have the final answer as
11.30 g/mLHope this helps you
Answer:
Approximately 11.3 g/mL
Explanation:
The formula for density is mass divided by density. In this problem, the mass is already given: 265.6 grams. The density is the part with the milliliters. 75.5 mL - 52.0 mL is 23.5 mL.
After plugging these numbers into the formula, you get 265.6 g/23.5 mL. After divided those numbers, you get 11.30212..... g/mL, which rounds to 11.30 g/mL.
I hope this helps!
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:
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.
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