Final answer:
The mass of 36 dm3 of CO2 at room temperature is 66.02 grams, calculated by first determining the number of moles and then multiplying by the molar mass of CO2.
Explanation:
To calculate the mass of 36 dm3 of CO2 at room temperature, we can use the molar volume of a gas at room temperature, which is approximately 24 dm3/mol. Given that the molar mass of CO2 is 44.01 g/mol, we can first find the number of moles of CO2 by dividing the volume by the molar volume.
Number of moles = Volume / Molar volume = 36 dm3 / 24 dm3/mol = 1.5 moles
Now, to find the mass, we multiply the number of moles by the molar mass of CO2.
Mass = Number of moles × Molar mass = 1.5 moles × 44.01 g/mol = 66.02 g CO2
describe the nucleus. what can be found inside the nucleus?
The small, central core of an atom. The nucleus of an atom is made up of both protons "positive charges" and neutrons "no charge."
Evidence of a chemical change would be a ___________________. Question options: spinning top. rusting car fender. spilled bucket of water. melting popsicle.
two objects of different masses are sitting on a different balance scales. object A has a greater mass than object B how will the weights of the objects compare to each other?
Explanation:
Since it is given that object A has greater mass this means that object A is heavier than object B.
Therefore, when both object A and object B is placed on a balance scale on either side then the balance scale will move downwards on the side where object of heavier mass is placed.
That is, balance scale will be in downward direction where object A is placed. Whereas balance scale will move upwards where object B is placed.
several scientists are working together to study the change in the number of whales born each year along the northern coast of California. What is the controlled parameter
I believe that in this case the controlled parameter is the type of animal that they are observing. There are a lot of animals in the ocean, therefore to have a scope of their study of observation, they are controlling or limiting their observations on the whale alone. Hence the controlled parameter is the type of animals, whales.
What are the main concepts that make up the study of earth science?
Answer:
to study the earth.
Explanation:
there are five branches.
geology-geologists- people who study the earth.
oceanography- oceanographers- people who study the oceans
environmental science- environmental scientists- people who study the environment.
meteorology- meteorologists- people who study the weather.
astronomy- astronomers- people who study the universe beyond earth.
Explain whether nitrogen atoms will form bonds with other atoms
What things can water do while in the gaseous phase?
Atoms can gain lose or share electrons durning a chemical change why doesn't this cause the atoms identities to change?
___ Particles of which of the following have the greatest thermal energy
A. a liquid
B. a crystalline solid
C. a gas
D. an amorphous solid
Which of these is an example of a chemical change? Fireworks exploding
grinding powder
melting cheese
ironing a shirt
fireworks exploding is the answer
Answer is B. Fireworks Exploding.
Which of the following statements is true regarding scientific hypotheses?
A.There are no valuable hypotheses.
B. A testable hypothesis is valuable only if all evidence supports it.
C. Every hypothesis is valuable, whether or not it is testable.
D. A testable hypothesis is valuable, even if evidence shows that it is false.
I would say D.
A is incorrect by simple reasoning.
B is also incorrect. A hypothesis is made before evidence supports it, therefore, it doesn't matter if all evidence supports it, as it shows an guess. It sometimes can also lead to more experimentation even if it's not true for the current experiment.
C is also incorrect. An untestable hypothesis isn't useful as you cannot test anything relating to it, and it cannot be proven or disproven.
Hope this helps!
The statement that is true regarding scientific hypotheses B. A testable hypothesis is valuable, even if evidence shows that it is false.
Explanation:In the scientific method, a hypothesis is a proposed explanation for a phenomenon or observed behavior. A testable hypothesis is one that can be tested through experiments or observations. Even if the evidence shows that the hypothesis is false, it is still valuable because it helps researchers eliminate incorrect explanations and refine their understanding of the topic.
For example, let's say a researcher hypothesizes that a new drug will cure a particular disease. They conduct experiments and analyze the data, only to find that the drug does not have the desired effect. The hypothesis may be proven false, but the research process can still provide valuable insights and pave the way for new hypotheses or solutions.
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A certain ore is 29.9% nickel by mass. How many kilograms of this ore would you need to dig up to have 75.0 g of nickel?
To obtain 75 g of nickel from an ore that is 29.9% nickel by mass, approximately 0.252 kilograms of the ore would be required.
Explanation:This type of problem is a matter of conversion between the mass of the ore overall and the mass of the specific component, in this case, nickel. The ore is 29.9% nickel by mass, which means for every 100 g of ore, there are 29.9 g of nickel.
To find out how much ore is needed to yield 75 g of nickel, we can set up a proportion: (29.9 g nickel / 100 g ore) = (75 g nickel / x g ore).
Solving for x, we find x = (75 g nickel * 100 g ore) / 29.9 g nickel = approximately 251.67 g ore.
This is the mass of the ore required in grams. Since the question asks for the answer in kilograms, we will need to convert this to kg. Knowing that 1 kilogram = 1000 grams, we divide the answer by 1000 and find that approximately 0.252 kg of the ore would need to be dug up in order to have 75.0 g of nickel.
Learn more about Mass conversions in Chemistry here:https://brainly.com/question/31389471
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Object A has a mass of 10 g and a volume of 8 cm3. Object B has a mass of 10 g and a volume of 6 cm3. Which object has a greater density and by how much? Object A, by 2 grams per cubic centimeter Object A, by 0.42 gram per cubic centimeter Object B, by 2 grams per cubic centimeter Object B, by 0.42 gram per cubic centimeter
It’s D honey, Object B, by 0.42 gram per cubic centimeter
Water has a density of 1.0 g/cm3. Glycerin, a liquid used in some soaps, has a density of 1.26 g/cm3. If an object sinks in water but floats at a constant depth in glycerin, its density is _____.
A. between 1.0 g/cm3 and 1.26 cm3
B.exactly 1.26 g/cm3
C.greater than 1.26 cm3
D.less than 1.0 g/cm3
Hello! Since the object will sink in the water that has a density as 1.0, then it obviously cannot be D. If it floats at the Glycerin level at 1.26, then it cannot be C. An object or a substance can float on the exact level of density as water or liquids. The answer is B. Exactly 1.26 g/cm3. I hope I helped! Please mark me brainliest if you find suitable! Have a fantastic day! :)
(26+2)÷7 what is the answer
If a compound is separated into separate parts does the substance remain the same substance