Answer:
1x 10⁴ m or 1000 meters
Explanation:
1 hectometer = 100 meters
10 hectometers = 10 x 100 meters = 1000m
or in scientific form = 1 x 10⁴
Convert 78.9 kJ into calories (can you also explain how pls, ty <3)
Answer:
1 Joule=0.2390057361 Calorie
789kj=789×0.2390057361×1000
=188575.5257829calorie
Explanation:
Hope u have understand
How can a mixture be separated into pure substances?
Answer:
mixture can be separated into pure substances by simple distillation
A mixture can be separated into pure substances with the utilization of several techniques of physical methods like simple distillation, centrifugation, sedimentation, etc.
What is the function of simple distillation?Simple distillation may be defined as a type of separation technique that involves the separation of solvent from a solution. This technique is utilized for purifying the liquids that comprise either nonvolatile impurities such as sand, salt, and other very small amounts of particles.
Apart from simple distillation, evaporation is also used to eliminate water or any liquid substance from a mixture. It makes the solution or mixture dry with the absolute absence of water.
The Centrifugation technique is used to separate the particles on the basis of their size, shape, density, viscosity, and rotor speed.
Therefore, with the utilization of separation techniques, one can easily separate a mixture into pure substances.
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i’m stuck on part b of this question :( this is from the ap chem textbook on pg. 35 just so u know. please help!
Answer:
b) Aluminum sphere: 11.4J
Silver sphere: 44.3 J
Explanation:
a) Mass of aluminum sphere
= 2.70(196)
= 529.20g
= 0.5292kg
Mass of silver sphere
= 10.49(196)
= 2056.04g
= 2.05604 kg
b) Work done (Joules)
= force (Newton) ×distance moved in the direction of the force (in meters)
[tex] \boxed{W = F \times d} [/tex]
To raise the sphere, the work done is against gravity.
For the formula for weight (or force of gravity), the mass needed is in kg, which we have already converted to in part (a).
Since they asked for the work done on each sphere, let's calculate the work done for the aluminium sphere first.
Aluminium sphere:
F= mg
F= 0.5292(9.8)
F= 5.18616N
W= Fd
Work done
= 5.18616(2.2)
= 11.4J (3 s.f.)
Silver sphere:
F= mg
F= 2.05604(9.8)
F= 20.149192N
W= Fd
Work done
= 20.149192(2.2)
= 44.3J (3 s.f.)
You find two containers on a chemical shelf, one labeled Cu2O(s) and a second labeled CuO(s). Are these substances the same or different explain.
Given :
Two chemicals [tex]Cu_2O(s)[/tex] and [tex]CuO(s)[/tex] .
To Find :
Are these substances same or different explain.
Solution :
It might seem that the difference is none because the atoms used in the molecules are same but in different proportion .
But , their is a lot of difference between them .
The change in configuration impacts a lot in physical as well as chemical properties .
For ex :
[tex]Cu_2O[/tex] is red powder while [tex]CuO[/tex] is black powder .
[tex]Cu_2O[/tex] is fungicide while [tex]CuO[/tex] is used in batteries .
Hence , this the required solution .
Which feature of a hypothesis leads to a new experiment?
a basis on research
a dependency on prior knowledge
a possible explanation
an ability to be tested
Answer:
d
Explanation:
The feature of a hypothesis leads to a new experiment is an ability to be tested and the correct option is option 4.
A hypothesis is a proposed explanation or prediction for a phenomenon or observation. It is a tentative statement that can be tested through experimentation or further investigation.
A hypothesis is typically based on prior knowledge, research, and observations, and it serves as a starting point for scientific inquiry. It is a crucial step in the scientific method and provides a framework for designing experiments to gather evidence and support or refute the hypothesis.
A well-formed hypothesis should be clear, specific, and testable, allowing for the collection of data and analysis to draw conclusions about the validity of the proposed explanation.
Thus, the ideal selection is option 4.
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What is the relationship between molar mass in grams per mole (g/mol) and average atomic mass in amu of each element?
Answer:
The molar mass and atomic mass are essentially the same for an element
Explanation:
The molar mass of a substance can be obtained by dividing the mass of the substance by the no of moles of the substance present.
The atomic mass of an element is the number of protons and neutrons present in the substance.
These two measurements usually give the same values because they both make reference to the 1/12th the mass of carbon-12 for their measurement.
Because they both have the same reference point, though they have different calculating procedures, the results obtained will be similar.
If a lab experiment is not completed, you should:___________.
A. discuss the issue with your instructor.
B. sneak in after school and work alone.
C. come in during lunch and finish while eating lunch.
D. make up some result
If a lab experiment is not completed, the appropriate course of action would be to discuss the issue with your instructor. The correct option is A.
They may provide guidance on how to proceed, such as rescheduling the experiment or offering an alternative solution. By discussing the issue with your instructor, you can ensure that you follow the appropriate steps to resolve the situation and avoid any potential negative consequences.
Sneaking in after school and working alone (option B) is not a recommended solution, as it is important to follow proper procedures and protocols when conducting experiments.
Coming in during lunch and finishing the experiment while eating lunch (option C) is also not a suitable solution.
Making up some result (option D) is not an appropriate action to take. Falsifying data is unethical and goes against the principles of scientific integrity.
Thus, the correct option is A.
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Which table best shows some functions of the circulatory, respiratory, digestive, and endocrine systems?
Answer:
This question is incomplete as it does not include the table. However, the functions of the systems on the table with their associated systems are;
- Releases hormones: Digestive and endocrine systems
- Supplies the body with oxygen: respiratory and circulatory systems
- Supplies the body with nutrients: digestive and circulatory systems
- Removes carbon dioxide: respiratory and circulatory systems
Explanation:
Endocrine system of the body constitutes endocrine glands that secrete hormones into the bloodstream. Example of endocrine glands are the adrenal gland, pituitary gland, hypothalamus, thyroid, ovaries etc. However, the PANCREAS, which is an organ in the digestive system is also an endocrine gland that secretes INSULIN and GLUCAGON hormones into the bloodstream. Hence, the endocrine and digestive systems releases hormones
The respiratory system comprises organs that regulate gas exchange in the body i.e. take in oxygen, take out carbon dioxide. However, the circulatory system, which comprises the arteries, veins, capillaries transports the oxygen throughout the body via the blood. The oxygen enters via the respiratory system and is circulated by the circulatory system.
Ingested food is broken down via the digestive system, which comprises of organs like small intestine, stomach, pancreas, large intestine, liver etc. The digested food releases nutrients into the bloodstream, which gets transported by the blood to other parts of the body. Hence, the circulatory and digestive systems play a part in supplying the body with nutrients.
Respiratory system via the process of gas exchange removes carbon dioxide from the body system. However, the carbon dioxide waste enters into the bloodstream (circulatory system) initially before getting transported to the lungs where the respiratory system takes over by exhalation
Answer:
I think it is the third option.
Explanation:
How do you find the mass of an element or compound?
Answer:
[tex]147515[/tex]
no inglés sorry
Answer:
by addding up the the mass of protons and neutrons
Which characteristic should describe all evidence collected by a scientist?
A. true
B. obvious
C. objective
D. subjective
Answer:
Option C
Objective
Explanation:
When dealing with the study of natural phenomena, a purely objective approach must be made by scientists. This is because natural phenomena exist, devoid of human feelings or emotions. There is no room for subjectivity as the natural occurrences do not vary based on human thoughts and perceptions; rather they exist on their own.
Therefore, every evidence collected by scientists should be objective and analysis should be made based on characteristics displayed and not from their previous experiences or personal point of view.
PLEASE HELP I HAVE THIS TEST TOMORROW AM GIVING MORE POINTS THAN I SHOULD
When 33 g of CaO and 10 g of H20 react, 2 g of Cao remain unreacted. What is the mass of calcium hydroxide produced?
Answer:
41.11 g of Ca(OH)2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
CaO + H2O —> Ca(OH)2
Next, we shall determine the masses of CaO and H2O that reacted and the mass of Ca(OH)2 produced from the balanced equation. This can be obtained as follow:
Molar mass of CaO = 40 + 16 = 56 g/mol
Mass of CaO from the balanced equation = 1 × 56 = 56 g
Molar mass of H2O = (2x1) + 16
= 2 + 16
= 18 g/mol
Mass of H2O from the balanced equation = 1 × 18 = 18 g
Molar mass of Ca(OH)2 = 40 + 2(16 + 1)
= 40 + 2(17)
= 40 + 34
= 74 g/mol
Mass of Ca(OH)2 from the balanced equation = 1 × 74 = 74 g
From the balanced equation above,
56 g of CaO reacted with 18 g of H2O to produce 74 g of Ca(OH)2.
Finally, we obtained the mass of calcium hydroxide, Ca(OH)2 produced from the reaction of 33 g of CaO and 10 g of H2O. This can be obtained as follow:
From the question given above, we were told that when 33 g of CaO and 10 g of H2O reacted, 2 g of CaO were remaining. This implies that H2O is the limiting reactant and CaO is the excess reactant.
Thus, we shall use the limiting reactant to determine the mass of calcium hydroxide, Ca(OH)2 produced because it will give the maximum yield as all of it is consumed in the reaction.
The limiting reactant is H2O and the mass of calcium hydroxide, Ca(OH)2 produced can be obtained as follow:
From the balanced equation above,
18 g of H2O reacted to produce 74 g of Ca(OH)2.
Therefore, 10 g of H2O will react to produce = (10 × 74)/18 = 41.11 g of Ca(OH)2.
Therefore, 41.11 g of Ca(OH)2 were obtained from the reaction.
is adding hydrochloric acid to milk a physical or chemical change?
Look at the diagram below- what evidence is there that it
represents a chemical change?
Answer:
The second one resprents a chemical change because a chemical change is when a new substances is combined with the other substances to form a new substances
Explanation:
The diagram with the orange and grey in the middle plus the orange and white that is what the other substance created.
the sample of matter of air
a car travels 120 kilometers due north, 82 kilometers due west and 120 kilometers south going from town A to town B, what is the cars total displacement from town A to B?
[tex]\rm{\pink{\underline{\underline{\blue{GIVEN:-}}}}}[/tex]
A car travels 120km due to North .82km due to west .120km due to south ..At last the car reached on town B from town A .[tex]\rm{\pink{\underline{\underline{\blue{TO\:FIND:-}}}}}[/tex]
The car's total displacement from town A to B .[tex]\rm{\pink{\underline{\underline{\blue{SOLUTION:-}}}}}[/tex]
✍️ See the attachment diagram .
✯ Hence, Total displacement from town A to town B is “ 82km ” .
Answer:
displacement is the is shortest distance travelled by an object between the initial and final the position.
So, the displacement between towns A and town B is 82 km.
pls follow me!
Explain why volume is an example of an extensive property and density an intensive property.
Extensive property is dependent on mass. Intensive property is property that depends only on the type of matter rather than the amount. Hense, Volume is an example of Extensive property and Density is an example of Intensive property.
Hope this helps :)
How many sig figs does 0.00002 have?
Identify from the following list which examples are controlled experiments. You make two pitchers of lemonade and only change the amount of lemonade mix you add. only change the amount of water you add. change both the amount of water and the amount of lemonade.
Answer:
It s A) only change the amount of lemonade mix you add, and B). only change the amount of water you add. I just did it
Answer:
It's the first two, only adding water and only adding lemonade mix, not both
Explanation:
Just got it right on Edge 2022
State two example of how engineers use their knowledge of atoms to create new technologies?( I am giving you high points for this give a good answer And I will give you brainliest)
The correct answer to this open question is the following.
Two examples of how engineers use their knowledge of atoms to create new technologies would be the following.
1.- Engineers can develop new medicines for chronic diseases when they use their knowledge about atoms. With new technologies and different scientific approaches, this new molecular medicine can be more effective in the treatment of terrible diseases that affect humans. The challenge lies in how to make these new medicines more affordable to all kinds of people, not only rich people.
2.- Engineers can also apply their knowledge about atoms to improve the water conditions so more people can have freshwater. Engineers that specialize in the environment can research the properties of water molecules and atoms, so they can develop new ways to purify and improve the quality of water, that we know that water scarcity is a major problem in many parts of the world.
Name a intensive and extensive property of iron
Answer: An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. ... Color, temperature, and solubility are examples of intensive properties.
Explanation:
An intensive property of iron is density while an extensive property of iron is mass.
WHAT ARE INTENSIVE AND EXTENSIVE PROPERTIES?
Intensive properties of a substance/element are those properties that do not depend on the amount of matter. Examples of intensive properties are density, boiling point, melting point etc. Extensive properties are those properties that depend on the amount of matter in a substance. Examples are mass, weight, volume etc.Regarding iron as an element, one intensive property it posseses is density while one extensive property is its mass.
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Which of the following is NOT classified as matter?
rock
B.
steam
C.
air
D.
light
What's 1.02 x 10^2 in standard notation?
Describe the relationship between nitrogen, oxygen and air. Be as specific and as
thorough as possible.
The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen
What is common to both physical
and chemical properties? List as
many similarities as you can.
Answer:
Chemical properties are very useful in identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.
Explanation:
HELPPPPP ASAP! A student listed the characteristics of chemical and nuclear reactions. Chemical and Nuclear Reactions X Y Changes the identity of the element Does not change the identity of the element Which of these statements best explains the identity of Reaction X? (5 points)
It is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.
It is a chemical reaction because the identity of elements change when there is a change in the mass of the atoms involved.
It is a chemical reaction because the identity of elements change when there is a change in the overall energy of the system.
It is a nuclear reaction because the identity of elements change when there is a change in the number of outermost electrons.
Answer:
It is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.
Explanation:
Reaction X is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.
A chemical reactions involves the combination of two or more elements to form a compound. A nuclear reaction occurs when an element is transformed into another element.
Reaction X is a nuclear reaction. This is because, the identity of elements changes when there is a change in the number of protons and neutrons.
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please help asap !!!!
identify the values that should be tested to see if a change occurs
x - values
y - values
z - values
h - values
Answer:
I think that it is A. x - values
who is allowed to go into a crime scene after its released?
Answer:
detectives, police officers and occasionaly lawyers/attorneys.
Explanation:
Non essential officers, judges, district attorney investigators, federal agents, victums, witnesses and politics are not permited to enter crime scenes unless they can provide information and history about the event.
How many electrons will oxygen gain when it becomes an ion?
A. It will lose electrons.
B. 2
C. 1
D. 3
Answer:
two electrons
Explanation:
Since every electron has a single negative charge, the addition of two electrons results in an oxygen ion with a charge of - 2
The digit that would have to be estimated in reading this instrument would be the nearest:
A: 0.001 g
B:0.01 g
C: 0.1 g
D: 0.0001 g
Answer:C
Explanation:
.1 is secure
.01 is secure because shows the lines and can line it up.
.001 you can not tell for sure what the last digit it.
The digit that would have to be estimated in the reading given instrument is the nearest 0.1 g. Therefore, option (c) is correct.
What is the uncertainty in the measurements?
Uncertainty means the range of possible values within which the true or actual value of the lies. The term accuracy is commonly used to mean the difference between the actual or true value and a measured result. Since the actual value of a measurement is not known, the accuracy of a measurement is generally not known either.
Uncertainty is almost always to one significant digit. If the uncertainty starts with a one, then sometimes uncertainty to two significant digits. The experimental measurement always rounds to the same decimal place as the uncertainty.
The uncertainties have two components one is bias related to accuracy and the unavoidable random variation that takes place when doing repeated measurements which are related to precision.
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2.
Reflect polygon P using line l.
P