Answer:
A. a ball dropped from the top of a building increases in speed until it hits the ground.
A ball dropped from the top of a building in speed until it hits ground is the situations violates the law of conservation of energy. Therefore, option A is correct.
What is the law of conservation of energy ?According to the law of conservation of energy, energy is neither created nor destroyed. When you roll a toy car down a ramp, and it collides with a wall, the energy is transferred from kinetic to potential.
Energy conservation does not imply energy savings. Instead, energy is neither created nor destroyed, according to the law of conservation of energy. When people use energy, it does not vanish. Energy is transformed from one form of energy to another.
The law of conservation of energy is violated when a ball is dropped from the top of a building at high speed until it hits the ground.
Thus, option A is correct.
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7. Jasmine wants to prevent getting burned by accidently touching a hot metal pipe, What would be the worst
insulator for her to use to put around the pipe?
a, Glass
b. Rubber
c. Cloth
d. Wood
Answer:
A) Glass
Explanation:
Glass is a conductor, so it allows heat to go through it (Ex. Touching a pie pan that came right out of the oven)
Rubber is an insulator, so heat has a hard time passing through (Ex. Using a rubber grip on a cast iron pan.
Cloth is also an insulator, so heat has a hard time passing through (Ex. Using a pot holder to prevent the counter from getting scarred)
Wood is also an insulator, so heat has a hard time passing through (Ex. Bedding for a rabbit hutch)
Hope this helps!!
Is water a reactant or product?
Answer: Reactant
Explanation:
In simple wording, Water act as a reactant and it broke or we can say split the larger molecule in the smaller ones, The H and OH bonds are attached to the two products that are formed after the reaction. Another process in which water is used as an important reactant is photosynthesis.
Which formula is an empirical formula?
A.CH4
B.C2H6
C.C3H6
D.C4H10
Answer:
CH4
Explanation:
What is the charge for the cation in MnS2
what’s the correct answer !!
Answer:
From my side the correct option is "A"
Explanation: Reasons for its correction are ,
1) Highly reactive: Nanoparticles are therefore extremely unstable and easily change themselves or react with active substances to reach a relatively stable state in some cases. This causes desired changes or undesired changes to nanoparticles and thus makes them exhibit a high reactivity and a poor stability.
2)Small size: Nanotechnology can provide rapid and sensitive detection of cancer-related molecules, enabling scientists to detect molecular changes even when they occur only in a small percentage of cells. Nanotechnology also has the potential to generate entirely novel and highly effective therapeutic agents.
Astronomers send probes to other planets to take pictures of their surfaces. An astronomer thinks that briny water flows on Mars because he noticed certain features in one picture of Mars. Which method did the astronomer
use to form this hypothesis?
1.reading scientific literature
2.making careful observations
3. analyzing a natural experiment
4. conducting a controlled experiment
Answer:
Its obviously 2 or 3 and since 2 isn't a method its 3
Explanation:
There you have it
To solve this we must be knowing each and every concept related to planet. Therefore, the correct option is option C among all the given options.
What is planet?A planet must accomplish three things: circle a star, be large sufficient to have sufficient gravity to compel a spherical form, and be large sufficient that its gravity swept away any similar-sized objects near its orbit.
Our solar system's planets did not arise out of nothing. The sun didn't either. They were all engulfed in a massive gas and dust cloud. Gravity gathered a lot of material inside the center to form the sun.
Astronomers send probes to other planets to take pictures of their surfaces. An astronomer thinks that briny water flows on Mars because he noticed certain features in one picture of Mars. Analyzing a natural experiment is a method to form this hypothesis.
Therefore, the correct option is option C.
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What is the percent yield if the actual yield is 1.5g and the theoretical yield is 4.5g?
Answer:
infinite yield
fortmatting clear and easy to udnerstnadx
Explanation:
90.5 g inf ytield
The proton number of barium (Ba) is 56. It is in Group II of the periidic table how many electrons would you expect a barium atom to contain in its outer energy level?
Answer:
A barium atom would be expected to contain 2 electrons in its outer energy level.
Explanation:
The columns of the periodic table are called groups. There are eighteen groups, numbered from 1 to 18.
The elements of each group have the same number of electrons in their last atomic shell, which is why they have similar chemical properties, because the chemical properties of chemical elements are strongly related to the electrons located in the last atomic shell.
That is, in a group, the chemical properties are very similar, because all the elements of the group have the same number of electrons in their last or last shells.
A barium atom would be expected to contain 2 electrons in its outer energy level.
How many grams of sugar are in 50 mL sample of a 2.4 sucrose solution?
Mass of sucrose : = 41.076 g
Further explanationGiven
50 ml sample of a 2.4 M sucrose solution(C₁₂H₂₂O₁₁)
Required
Mass of sugar
Solution
Mol sucrose :
= M(molarity) x V(volume)
= 2.4 x 50
= 120 mlmol
= 0.12 mol
Mass of sugar :
= mol x MW
= 0.12 x 342,3 g/mol
= 41.076 g
What is one bad thing that can happen when humans build more and more streets and buildings?
Answer:
there will be less and less space
Explanation:
What are the three main parts of an atom and what are their charges?
Where are the electrons found in an atom?
Answer:
Three main parts are Protons (pos charge) Neutrons (no charge) Electrons (negative charge) and the electron is found on the outside of the nucleus
Explanation:
Can two compounds be used as reactants for a synthesis reaction?
Why are some energy resources more expensive to use than others?
What are two sources of phosphorous?
A. Cows
B. Erosion
C. stratosphere
D. Fossil fuels
E. Fertilizer
Answer: A. Cows
E. Fertilizer
Explanation:
any help welcome on this, chem balancing equations btw !
Answer:
A. 1, 1, 1, 1
B.1,1,1
C. 2, 1, 2, 1
D. 2, 1, 1, 1
E.1,2,1,1
F.1, 1, 1, 2
G. 1, 6, 3, 4
H. 2, 3, 2, 3
As the human population grows, the size of cities increases. As cities grow, more land must be cleared to make way for homes, businesses, and roads. Which two events would be likely effects of replacing a forested area with an urban area? A. More air pollution because there are fewer trees to take in carbon dioxide B. Less erosion of soil as plants covering the ground are added to gardens C. Fewer birds and other wildlife because they have fewer places to live D. More trees because of increased solar energy in the area
Answer:1. Introduction
The main air pollutants are represented by gases forms, particles in suspension, different ionizing radiation and noise.
The gases forms are: oxidized and reduced forms of carbon (CO2, CO, CH4), of nitrogen (NO2, NO, N2O4, NH3, NH4+), SO2, O3, C6H6 vapours, Hg, volatile phenols, Cl2, etc.
The particulate forms are: PM10 and PM2.5 particulate matter, heavy metals with toxic effect (Pb, Ni, Cd, As), polycyclic aromatic hydrocarbons PAHs, etc.
Atmospheric pollutants have a negative effect on the plants; they can have direct toxic effects, or indirectly by changing soil pH followed by solubilization of toxic salts of metals like aluminum. The particulate matters have a negative mechanical effect. They cover the leaf blade reducing light penetration and blocking the opening of stomata. These impediments influence strongly the process of photosynthesis which rate declines sharply.
Explanation:
Answer:
A More air pollution because there are fewer trees to take in carbon dioxide
C Fewer birds and other wildlife because they have fewer places to live
Explanation:
I took the test on A P E X
The nucleus of a fluorine atom has a charge of?
A. +19
B. 0
C. +9
D. +1
Answer: B
Explanation: A fluorine atom has nine protons and nine electrons, so it is electrically neutral. (neutral =0)
The nucleus of a fluorine atom has a charge of zero as the atom has equal number of positive and negative charges.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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HELP LIKE HELP HURRY I HAVE 2 hours. To finish
Answer: hello, the answer would be rotates, revolves
hope this helps :)
Explanation:
Zn + 2MnO2 + 2H2O → Zn(OH)2 + 2MnO(OH) (balanced equation)
a. How many moles of Zn reacts when 0.200 moles of MnO(OH) is formed? (0.100)
b. How many moles of H2O reacts with 0.150 moles of Zn? (0.300)
c. how many moles of Zn(OH)2 are formed when 0.100 moles MnO2 reacts? (0.050)
d. How many moles of H2O react when 0.600 moles of MnO2 react? (0.600)
Answer:
Do you still need help?????????
How are rocks and water cycles similar? how are they different?
Answer: The water cycle is condensation, precipitation, evaporation, and transpiration. The rock cycle and water cycle overlap with erosion, transporting, and deposition.
There are various cycle in nature like water cycle, nitrogen cycle, rock cycle. In terms of cycling, water cycle and rock cycle are similar but in terms of steps these are different.
What is biological cycle?Biological cycle is a cycle in which recycling of element or compound take place in nature. It is circulation of a substance to its original form. It is rhythmic repetition of biological phenomena in associations of organisms. It involves multiple process.
There are various steps in water cycle like condensation, precipitation, evaporation, and transpiration while the process in rock cycle is erosion, transporting, and deposition.
Therefore in terms of cycling water cycle and rock cycle are similar but in terms of steps these are different
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Tropical climates generally __________. A. have warm temperatures year-round and little precipitation B. have warm temperatures year-round and lots of precipitation C. have warm temperatures in summer, cold temperatures in winter, and little precipitation D. have warm temperatures in summer, cold temperatures in winter, and lots of precipitation Please select the best answer from the choices provided A B C D[]
Answer:
B. Warm year round with lots of precipitation
Explanation:
GIVEN
What is the empirical formula for the following molecular formula: C10H5O2
The empirical formula is the same as the molecular formula : C₁₀H₅O₂
Further explanationGiven
Molecular formula : C₁₀H₅O₂
Required
The empirical formula
Solution
The empirical formula (EF) is the smallest comparison of atoms of compound forming elements.
The molecular formula (MF) is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
(EF)n=MF
(EF)n = C₁₀H₅O₂
If we divide by the number of moles of Oxygen (the smallest) which is 2 then the moles of Hydrogen will be a decimal number (not whole), which is 2.5, then the empirical formula is the same as the molecular formula
How do I balance "Lithium hydroxide + hydrogen acetate --> lithium acetate + water"
Answer:
LiOH+CH3COOH=C2H3LiO2+H2O balanced equation
Explanation:
lithium hydroxide-> LiOH
hydrogen acetate->CH3COOH
lithium acetate->C2H3LiO2
water->H2O
LiOH+CH3COOH=C2H3LiO2+H2O
Li=1,O=3,H=5,C=2 --> Li=1,O=3,H=5,C=2
the two sides have same numbers so it is balanced.
1
a)Put the metals used (magnesium, copper, iron, zinc)
in order from the least reactive to the most reactive.
The more reactive metal will displace the other metal
from the solution of its metal salt.
Answer:
Magnesium
Zinc
Iron
Copper
Explanation:
The given elements are:
Magnesium, copper, iron and zinc
We are to put them in the order from the least reactive to the most reactive of all.
To solve this problem, we simply use the activity series of metals to arrange the elements.
The activity series arranges metals from the most reactive to the least reactive. The more reactive metals displaces the lesser one from solutions.
So;
Magnesium
Zinc
Iron
Copper
At which temperature is the vapor pressure of ethanol equal to the vapor pressure of propanone at 35°C?
Answer: 60 C
Explanation:
Please help meee 25 points and please dont guess
Answer:
Reactant
Explanation:
B
Answer:
i belive that it is an elemnt
Explanation:
For species that reproduce asexually, all their offspring are
A. genetically identical
B. genetically different
C. almost identical
D. slightly different
Answer:
A. genetically identical
Explanation:
Asexual reproduction produces offspring that are genetically identical to the parent because the offspring are all clones of the original parent. A single individual can produce offspring asexually and large numbers of offspring can be produced quickly
All the offspring that are produced in the process are genetically identical.
When we talk about this mode of reproduction, we talk about a mode of reproduction in which an organism reproduces without the fusion of gametes. This occurs essentially by cell division.
When this occur, there is no crossing of genetic material as such, all the offspring that are produced in the process are genetically identical.
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Balance the following chemical equations.
1. Al + HCl → AlCl3 + H2
2. Al+S → ALS:
3. NO2 + O2 + N2O5
4. A1,03 → A1+ O2
5. Ba(C103)2 → BaCl2 + O2
The basic principle of the number of elements in reactants and products is the same used in balancing chemical equations
Further explanationGiven
The chemical equation
Required
The balanced equation
Solution
Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.
• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product
• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1
We give an example for reaction number 1:
aAl + bHCl → AlCl₃ + cH₂
Al, left = a, right = 1⇒a=1
Cl, left = b, right = 3⇒b=3
H, left = b, right = 2c⇒b=2c⇒3=2c⇒c=3/2
The equation becomes :
Al + 3HCl → AlCl₃ + 3/2H₂ x2
2Al + 6HCl → 2AlCl₃ + 3H₂
The steps are the same for the other reactions
2. 2Al + 3S → Al₂S₃
3. 4NO₂ + O₂ → 2N₂O₅
4. 4Al + 3O₂ → 2Al₂O₃
5. Ba(ClO₃)₂ → BaCl₂ + 3O₂
How many moles of H₂O can be produced when 5.5 moles of CO₂ is produced? C₂H₄ + 3 O₂ --> 2 CO₂ + 2 H₂O
Answer:
5.5 mol H2O
Explanation:
Given over what you need and then mole ratio of coefficients in the balanced equation then cross multiply and do PEMDAS for that, and then you got your answer :) hope this helped.
what is the correct answer !
Answer:
Hi there, The correct answer is, OPT A
Explanation:
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