The law of conservation of mass is directly represented in a balanced chemical equation.
What is the law of conservation of mass?In chemistry, the law of conservation of mass says that in a closed or isolated system, matter cannot be created or destroyed in a chemical reaction.
For example: If we burn wood, the mass of ashes and gases is equal to the mass of wood before burning.
Thus, the Law of conservation of mass represent a balanced chemical equation.
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Which problem can NOT be answered by experiment?
A) Do ultraviolet rays cause skin cancer
B) Does a certain drug kill the AIDS virus
C) Which wavelength of light has the most energy
D) Did continental drift cause the extinction or the megalodon?
Answer:
the answer is C
Explanation:
Explanation is C
Answer: the answer above is wrong, the correct answer is: Did continental drift cause the extinction of the megalodon
Explanation:
Where is an electron located within an atom?
O A. Anywhere within the atom
B. Attached to a proton
C. In the nucleus of the atom
D. In the cloud around the nucleus
Answer:
D because electron is negatively charge around the nucleus
electrons are found outside the nucleus
An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.
What is an atom?Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons. Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.
The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.
The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.
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Fill in the blanks
Kinetic energy is the energy of
Potential energy is the energy of
It increases with
It increases with
and
or
Answer:
Here is the answers I got 8 out of 8 correct :D))
Explanation:
How can you determine the number of neutrons in an atom?
A. Atomic number minus mass number
B. Mass number minus atomic number
C. Atomic number plus mass number
D. Mass number plus number of electrons
the first one to answer gets the brainliest UwU
Answer:
d
Explanation:
Answer: B. Mass number minus atomic number
Explanation: The atomic # is equal to the # of protons. The mass number is the total mass of neutrons & protons. You subtract the protons (atomic number) from the mass of the atom, the formula would be as shown:
Mass - Protons = Neutrons
An example is shown below
Element: Tin
Name shown on periodic table: Sn
Atomic #: 50
Mass # 118.711
118.711 - 50 = 68.711 <--- answer
Mass^ ^Protons/ Atomic #
I hope this helps :)
Question: How many grains of rice are in a 453.6 g (1lb.) bag of rice?
The rice is white.
The height of the bag of rice is 2.54 cm.
The length of the bag of rice is 20 cm.
The width of the bag of rice is 8 cm.
A grain of rice has a length of 6.0 mm.
20 grains of rice weigh .58 grams.
Answer:
453.6/58/2=453.6/2.9=156.314 grains
The number of grains in a 453.6 g (1lb.) bag of rice is equal to 157 grains of rice.
What is weight?The weight can be described as the force acting due to gravity. Weight can be considered as a vector quantity if the gravitational pull is acting on the body.
Therefore, in free fall, the weight of the object would be zero. Therefore, terrestrial objects can be weightless while ignoring air resistance.
The unit for measurement of weight is the same as of force, which is the newton. A body with a mass of 1 kilogram will exhibit a weight of about 9.8 Newton on the surface of the Earth, and about 1/6th as much weight on the Moon.
Given the weight of the 20 grains = 58 g
The weight of one grain = 58/20 = 2.9 g
The number of grains (n) of rice in weight 453.6 g of the bag of rice can be calculated as:
n = 453.6/2.9
n = 156.4 ≈ 157
Therefore, the number of grains can be considered equal to 157 grains of rice.
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I need help with studying for my finals!!! Can somebody explain how to get the answer please :)
A sample of hydrogen gas is prepared by water displacement at a pressure of 760 torr and a temperature of 22C. If the vapor pressure of H2O at that temperature is 20 torr, what is the partial pressure of the hydrogen?
Answer:
This informative text, written in easily understood language, will allow those without a mechanical engineering background to understand air calculation and ventilation problems.
how is cell wall made up of and what is its function ?
Explanation:
The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants. The three layers are the middle lamella, primary cell wall, and secondary cell wall
Answer:
The cell wall is an outer protective membrane in many cells including plants, fungi, algae, and bacteria. ... The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants.
Explanation:
How many sublevels are in L energy level?
Answer:
14
Explanation:
during a 2 hour trip,a family is able to travel 140 kilometers. what is the average speed of the family during this portion of this trip?
The average speed of the family : 70 km/h
Further explanationGiven
time = 2 hour
distance = 140 km
Required
The average speed
Solution
Distance is the length traveled by an object within a certain time
Average speed = total distance/total amount of time
Can be formulated :
Avg speed = d : t
Total distance traveled : 140 km
Total time : 2 hr
Avg speed = 140 : 2 = 70 km/h
1) Click the orange button to "Break Bonds." What is needed in order to break a
chemical bond?
what is the role of carbon dioxide in photosynthesis
Answer:
During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. Then, via respiration processes, cells use oxygen and glucose to synthesize energy-rich carrier molecules, such as ATP, and carbon dioxide is produced as a waste product
2AlF3 + 3K2O → 6KF + Al2O3
How many grams of AlF3would it take to make 15.524 g of KF?
?g AlF3 (use 5 sig figs)
7.4797 g AlF₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN] 2AlF₃ + 3K₂O → 6KF + Al₂O₃
[Given] 15.524 g KF
Step 2: Identify Conversions
[RxN] 6 mol KF = 2 mol AlF₃
Molar Mass of K - 39.10 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of Al - 26.98 g/mol
Molar Mass of KF - 39.10 + 19.00 = 58.1 g/mol
Molar Mass of AlF₃ - 26.98 + 3(19.00) = 83.98 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 15.524 \ g \ KF(\frac{1 \ mol \ KF}{58.1 \ g \ KF})(\frac{2 \ mol \ AlF_3}{6 \ mol \ KF})(\frac{83.98 \ g \ AlF_3}{1 \ mol \ AlF_3})[/tex]Multiply/Divide: [tex]\displaystyle 7.47966 \ g \ AlF_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
7.47966 g AlF₃ ≈ 7.4797 g AlF₃
5. If you combine 15.6 g Mg with 13.9 g of Br, what is the percent composition of each
element in the mixture.
Answer:
Mg: 52.9%
Br: 47.1%
Explanation:
2C,H.19)
70, (9) + 400, (9) + 6H,00).
Answer:
g) 400 (h) 1331 (i) 11 (j) 20 (k) 13 (l) 15 ... (e) 1 , 2, 3, 6, 9, 18 (f) 1, 5, 25 (g) 1, 2, 4, 5, 8, 10, 20, 40. (h) 1, 2 ... 19. 70 x. (h) x. 6. (i). 9. 8 x. (j). 27. 24 x. (k). 5. 4. 20 a b. +. (l). 8. 3. 24 x y. +. (m).
How many neutrons are in the nucleus of an atom that has an atomic mass of 53 and an atomic number of 25
Answer:
I think it will 25 this is the answer of this qn
neutrons : atomic mass - atomic number so
53-25
28 is the answer
jowl is a derived unit give reason
Answer:
Explanation:
Joule is the unit of energy and work done.
It is a derived quantity because it is not a fundamental or basic unit.
A derived unit is formed by the combination of two or more fundamental quantities.
Since work done = Force x distance
Force = mass x acceleration
= mass x acceleration x distance
The unit then becomes kgm²/s²
So, 1joule = 1kgm²/s²
In a crash test demonstration, a car with a bowling ball inside hits a brick wall. The bowling ball
then flies out of the car because it is not restrained. Which statement best describes why this
happened?
A. An object will remain at rest or move in a straight line unless it is acted upon by another
force.
B. An object acted upon by an unbalanced force will accelerate in the direction of the force.
C. An object will resist motion if the surfaces of the two objects resist each other.
D. For every action, there is an equal but opposite reaction.
explain how the addition of thermal energy (heat) from matter affects its particles
Answer:
when a substance is heated it gains thermal energy. Therefore its particles move faster and its temperature rises. when a substance is cool it loses thermal energy which causes its particles to move more slowly and its temperature to drop
A substance gains thermal energy when it is heated. As a result, its temperature increases, and its particle motion accelerates.
What is thermal energy?Thermal energy is the heat energy that is given to a substance when its temperature is increased.
As we know, all matter are made up of atoms, and atoms are made up of charged particles. These particles become random or come in motion when they get thermal energy or heat.
When substances get thermal energy or heat energy. They become active, and the particles move apart from each other.
So, due to thermal energy, the atoms become loose, and the substance loses its shape, the temperature decrease the atoms come closer to each other.
Thus, when a substance cools, thermal energy is lost, which slows down the movement of its particles and lowers the substance's temperature and vice versa.
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As temperature changes, rocks expand and
contract. The rocks eventually break into
smaller pieces. Which process accounts for
this expansion and contraction of rocks?
Answer:
Thermal heating and cooling
Explanation:
This process described results from thermal heating and cooling as a mechanism of mechanical weathering of rock bodies.
It is often more pronounced in the arid regions of the world where there is a significant difference between day and night temperatures. With mechanical weathering, rocks are broken down into fragments by physical disintegration. During the day, the high temperature causes the rock to expand significantly. At night, the rock contracts and on the long run, joints and fractures begins to appear on the rock surface.What would the mass be, in grams, of 0.89 moles of Cl2?
Answer:
Mass = 63.19 g
Explanation:
Given data:
Number of moles of Cl₂ = 0.89 mol
Mass in gram = ?
Solution:
Formula:
Mass = number of moles × molar mass
Molar mass of Cl₂ = 71 g/mol
by putting values,
Mass = 0.89 mol × 71 g/mol
Mass = 63.19 g
Which of the following indicates that a chemical reaction system has reached equilibrium?
a)the temperature of the system is increasing.
b)the concentration of reactants is decreasing.
c)the temperature of the system is decreasing.
d)the concentration of products is constant
the volume of the system is changing.
TRUE FALSE? The MOLE is a unit in Chemistry that serves as a bridge between the ATOMIC and MACROSCOPIC worlds?
Answer:
True
Explanation:
A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
100 POINTS AND BRAINLIEST
Answer:
please brainliest
Explanation:
the equation formula answer is [tex]x^{2} fxb\sqrt{3[/tex]
Answer:
the equation formula answer is x2 fxb[tex]\sqrt{3}[/tex]
Why does the body need nitrogen compounds?
To make carbohydrates
To make lipids
To make proteins
Answer:
To make proteins....
It is used to make amino acids in our body which in turn make proteins.
Explanation:
hope it was helpful.....
What causes Bread to be fluffy? What kind is bread of the fluffiest?
Use the following information to answer Q1-Q3
The shuttle has a separate fuel tank containing liquid hydrogen and liquid
oxygen.
Explain why hydrogen and oxygen are transported as liquids rather than as gases.
Answer:
Likely the reason behind carrying them in liquid for is to condense them. liquid takes up far less space than gases do and will last far longer. they can be transformed back into gases through heating them back up. To keep them solid would require frigid temperatures but liquid will transfer more easily through space.
PLEASE ANSWER QUICK 20 PTS AND ILL MARK YOU BRAINLIEST
What is Sodium (Na) level of reactivity?
Low Reactivity
Medium Reactivity
High Reactivity
Not Reactive- Stable
Help me if u got at science:)
Please
What are two benefits of this model volcano over a real volcano?
0 A. The model is more complex than a real volcano.
B. The model is smaller than a real volcano.
O c. The model is more expensive than a real volcano.
O D. The model is safer than a real volcano.
Answer:
the answer is C
Explanation:
Answer:C B
Explanation:
If a gas had a volume of 6.7 L and started at STP, what would the new pressure be
if the volume ended at 1.5 L?
The new pressure would be = 4.46 atm
Further explanationGiven
V₁=6.7 L(at STP, 1 atm 273 K)
V₂=1.5 L
Required
The new pressure
Solution
Boyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
P₂ = (P₁V₁)/V₂
P₂ = (1 atm x 6.7 L)/1.5 L
P₂ = 4.46 atm
Chris tested several metallic objects to see if they were magnetic. He concluded that many metallic objects were not magnetic. Which observation would have led Chris to this conclusion?
Answer:
the metallic objects not sticking to a magnet