The answer is 1.25e-8.
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
What is scientific notation
scientific notation is a mathematical way to turn large of small numbers into a simpler form.
ex. 9000000000 is 9*10^9 in scientific notation
ex. 0.000000009 is 9*10^-9 in scientific notation
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!
1. Isotopes of are atoms of the same element that vary in
A. protons
B. neutrons
C. protons and neutrons
D. neutrons and mass
2. What do these 2 atoms have in common? B-10 and B-11?
A. both have same number of neutrons
B. both have 5 electrons
C. both have 6 protons
D. both have same mass
Explain how you got your answer
Answer:
1. D
2. B
Explanation:
1. Isotopes vary in neutrons. Due to this variance, the difference in neutrons change the mass of the element.
Note: the amount of protons in an element never changes. The number of protons (the atomic number on the periodic table) identifies the element in question. If you add or subtract protons, you change the element.
2. B-10 and B-11 are two isotopes of the element Boron: One with 10 neutrons, and another with 11 neutrons. Because they contain a variance of neutrons, they do not have the same mass. This cancels choices A and D.
The protons of an element are equal to the atomic number of that element. Borons atomic number is 5 (according to the periodic table), so it contains 5 protons. This cancels choice C as the element with 6 protons is Carbon.
Note: The amount of protons in an atom is balanced out by the same amount of electrons to allow for a neutral charge of the element (i.e., the protons, which contain a positive charge, and electrons, which contain a negative charge, cancel each other out. In the case of Boron: +5 protons - 5 electrons = 0 charge). This is why choice B is correct, as the consideration of an ion is not necessary for this question.
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.
Suppose now that you wanted to determine the density of a small crystal to confirm that it is phosphorus. From the literature, you know that phosphorus has a density of 1.82 . How would you prepare 20.0 mL of the liquid mixture having that density from pure samples of ( = 1.492 g/mL) and ( = 2.890 g/mL)? (Note: 1 mL = 1 .)
Answer:
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
Explanation:
Given that:
the density of the mixture = 1.82 g/mL
From the density of the pure samples
The density of [tex]CHCl_3[/tex] = 1.492 g/mL
The density of [tex]CHBr_3[/tex] = 2.890 g/mL
The total volume of the liquid mixture = 20.0 mL
Suppose the volume of [tex]CHCl_3[/tex] = P ml
and the volume of [tex]CHBr_3[/tex] = Q ml
the sum of their volumes should be equal to the total volume of the mixture
[tex]P \ ml + Q \ ml = 20 ml[/tex] ----- (1)
However, we know that Density = mass/volume
∴ mass = density × volume
The equation can now be expressed as:
[tex]\mathtt{(Density \ of \ CHCl_3 \times Vol. \ of \ CHCl_3 ) + (Density \ of \ CHBr_3 \times \ volume \ of \ CHBr_3)} = \mathtt{ (Density \ of \ mixture \times volume \ of \ the \ mixture)}[/tex]
1.492 g/mL × P mL + 2.890 g/mL × Q mL = 1.82 g/mL × 20 mL ---- (2)
From equation (1) ;
let Q = 20 - P
The replace the value of P into equation (2)
1.492 g/mL × P mL + 2.890g/mL × (20 - P) mL = 1.82 g/mL × 20 mL
1.492 P g + 57.8g - 2.890 P g = 36.4g
1.492 P g - 2.890 P g = 36.4g - 57.8g
-1.398 P g = -21.4g
P = -21.4g/-1.398g
P = 15.31 mL
Q = 20 - P
Q = (20 - 15.31) mL
Q = 4.69 mL
∴
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
gottfried wilhelm von leibniz invented digital mechanical calculator called
Answer:
It was called The Step Reconer
stepped reckoner was invented by digital mechanical calculator
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
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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How many significant figures are in $10,000,210
7
3
Answer:
7
Explanation:
Answer:
7
Explanation:
The significant figures are: 1,0,0,0,0,2,1
Remember the rules is
1. Non-digits are always significant.
2. Any zeros between two significant digits are significant.
3. A final zero or trailing zeros in the decimal portion only are significant
Those are three rules you have to follow in order to see how many significant figures there are in 10,000,210.
So I’m guessing 7 is the answer
Therefore the answer is 7.
Hope this helps! :)
Brainliest would be highly appreciated! Thanks! :)
The density of helium is 0.17 g/L. What Is the mass of helium in a 5.4 L helium balloon? (2 sig figs) *
Answer:
The correct answer is 0.92 g
Explanation:
The density is defined as the mass per unit of volume:
Density= mass/volume
From the data provided:
volume= 5.4 L
density= 0.17 g/L
Thus, to calculate the mass of helium:
mass= density x volume = 0.17 g/L x 5.4 L= 0.918 g ≅ 0.92 g
What products are formed when a hydrocarbon combusts?
A. Hydrogen and oxygen
B. Carbon dioxide and water
C. Carbon dioxide and hydrogen
D. Water and hydrogen
Answer:
b
Explanation:
The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.
Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.
During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.
The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.
Thus, the ideal selection is option B.
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What problem did the development of the metric system solve?
Answer:
The problems solved by the metric system includes, the eradication of fraud prevalent by the use of the approximately 800 units that were defined in 250 thousand ways due to the difference of the associated quantity to the units in different towns
The development of the metric system also solved the issues scientist had with working with the medieval system which were mainly national and regional systems that hindered scientific communication across regions
Explanation:
Dalton’s theory states that atoms are the smallest possible parts of elements. In a chemical reaction, atoms will rearrange and form new substances with new properties. change form into completely new atoms with new properties. be destroyed and remade into new substances. be turned completely into energy.
Answer: A rearrange and form new substances with new properties.
Explanation: Got it right on Edgenuity
Answer:
a
Explanation:
got it right
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:
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
A covalent bond is likely to be polar when ________. one of the atoms sharing electrons is more electronegative than the other atom carbon is one of the two atoms sharing electrons the two atoms sharing electrons are equally electronegative the two atoms sharing electrons are of the same elements 0
Answer:
one of the atoms sharing electrons is more electronegative than the other atom
Explanation:
A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom. Therefore, option (A) is correct.
What is a covalent bond?A covalent bond can be described as a chemical link formed by the exchange of electron sets between particles. A covalent bond can be formed by equal sharing of electrons from both contributing atoms.
The pair of electrons in this type of bonding is known as shared pair or bonding pair. Covalent bonds are the sharing of bonding pairs that will ensure that the atoms gain stability in their outer shell.
Elements with very high ionization energies are incapable of transferring electrons and elements having low electron affinity cannot accept electrons. Covalent bonding takes place between two non-metallic atoms characterized by the equal sharing of electron pairs between the atoms and other covalent bonds with an electronegativity difference is more than 2.0.
Therefore, the covalent bond can be polar if one atom is more electronegative than the other atom.
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hydrogen ions cannot exist alone but they exist after combining with water molecules true or false
How are the Celsius, Kelvin, and Fahrenheit scales similar? How are they different? Considering their differences, think of one scenario in which each scale is more convenient to use.
Answer:
The Celsius scale is in general use wherever metric units have become accepted, and it is used in scientific work everywhere. Kelvin temperature scale is the base unit of thermodynamic temperature measurement in the International System (SI) of measurement
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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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:
A standard gold bar has a mass of 12.4 kg. When the gold bar is placed into a container of water the volume changes by 642 mL. What is the density of gold in g/mL
Answer:
19.3 g/mL
Explanation:
The following data were obtained from the question:
Mass (m) = 12.4 kg
Volume (V) = 642 mL.
Density (D) =.?
Next, we shall convert 12.4 kg to grams. This can be obtained as follow:
1 kg = 1000 g
Therefore,
12.4 kg = 12.4 × 1000
12.4 kg = 12400 g
Therefore, 12.4 kg is equivalent to 12400 g.
Finally, we shall determine the density of the gold as follow:
Density is simply defined as the mass of the substance per unit volume of the substance. It can be represented mathematically as:
Density (D) = mass (m) / volume (V)
D = m/V
With the above formula, the density of gold can easily be obtained as follow:
Mass (m) = 12400 g
Volume (V) = 642 mL.
Density (D) =.?
D = m/V
D = 12400/642
D = 19.3 g/mL
Therefore, the density of hold is 19.3 g/mL
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.
What happens to particles when they are heated ?
Answer:
the molecules and atoms vibrate faster.
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determine the state of matter of the substance. The result of increased molecular motion is that the object expands and takes up more space.
➡ this answer is based on my research. I hope it can help you
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A sample has a volume of 10 ml and a mass of 4.2 g what density of the object
Answer:
0.42g/cm³ or 420kg/m³
Explanation:
1cm³ = 1ml
10 × 1cm³ = 10cm³
Density = Mass ÷ Volume
4.2g ÷ 10cm = 0.42 g/cm³
Density = 0.42g/cm³ or 420kg/m³
How does the amount of matter change when water changes state? (2 points)
a
The amount of matter always increases as water changes state.
Ob
The amount of matter always decreases as water changes state.
Ос
The amount of matter stays the same as water changes state.
o
d
The amount of matter varies depending on how water changes state.
Answer:
C, because matter can not be created or destroyed.
Explanation:
Hey there!
I believe your answer woukd be "The amount of matter stays same as water changes state."
Hope this helps!
Have a great day!
Uun element full name
Answer: Darmstadtium
Hope that helped
Answer:
Ununnilium
Explanation:
Uun on the table of elements is Ununnilium.
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.)
What is the volume of the table tennis ball?
cm3
The volume of the water in the graduated cylinder rose
as some of the water was displaced by the table tennis
ball. Find the volume of the ball using the formula
Vb = Vf-Vi
where Vb is the volume of the ball, Vf is the final volume
of the water, and Vi is the initial volume of the water.
Record the volume of the ball in Table A of your Student
Guide.
The volume of the ball is the same as the volume of fluid that it displaces.
Even though the question is incomplete but i will try to help you the much i can. We have to recall that the volume occupied by the tennis ball is equal to the volume of the water displaced and this offers a convenient way of measuring the volume of solids.
The volume of the tennis ball is obtained by accurately measuring he volume of the water before putting in the tennis ball. The volume of the ball is the same as the volume of fluid that it displaces which is Vb = Vf-Vi
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Answer:
40cm^3
Explanation:
I did this assignment and this was the answer so