Answer:
15° C
Explanation:
30-15=15
checking* 15+15=30 or 15x2=30
Which of the following areas would most likely see the largest amount of heat
flowing up towards the surface of Earth?
a. any area that just experienced an earthquake
b. an area of active volcanoes
c. all areas around the equator
d. heat never flows to the surface of the earth
Answer:
c. because all countries around the equator experiences heat
Which of the following is a physical change?
Dissolving salt in water
Digesting food
Burning wood
Oxidation
Are two atoms of same element identical
Answer:
No. Two atoms of the same chemical element are typically not identical. Since the states of the electrons in an atom are what determine the nature of the chemical bonding that the atom experiences, two atoms of the same element can react differently if they are in different states.
Answer: No
Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.
which factor increases as the efficiency of a machine increases
Answer:
Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. Another machine that loses input work is a bicycle.
Explanation:
Hope this helps.
The factor which increases as the efficiency of a machine increases is: work output.
Efficiency can be defined as a ratio of work (energy) output to work (energy) input.
Mathematically, the efficiency of a machine is given by the formula:
[tex]Efficiency = \frac{W_O}{W_I} \times 100[/tex]
Where:
Wo is the work output.Wi is the work input.Work can be defined as the amount of energy required to move an object from one point to another.
Hence, the work done by a machine is the product of the perpendicular force acting on the machine and the distance it covers or travels.
Ideally, the work output of a machine is highly dependent on its efficiency and as such, it is a factor which increases as the efficiency of a machine increases
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0.2 mol of the transition metal (M) comhine with excess chlorine gas to form 30.3 g of MCl3. What is the electronic configuration of the ion of the metal (M) in this compound?
(Sc=45, Cr=52, Fe=55.8, Co=58.9, Cl=35.5)
A) [Ar], 3d3
B)[Ar], 3d5
C)[Ar], 3d6
D) [Ne], 3s2 3p6
Given metallic chloride formula =MCl3
Means M has valency 3It belongs to Nitrogen(N) family.
The elements given by Nitrogen,Phosphorus,Arsenic,Stubnum(Tin),Bismuth.But the condition is that its transition element.
The element is vanedium(V)EC given by
[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^3[/tex]
[tex]\\ \sf\longmapsto [Ar]3d^3[/tex]
A dump truck, a sports car, and a bicycle are traveling at the same velocity. Which is true?
A The bicycle has the least kinetic energy.
B More information is needed to compare their kinetic energy.
C They all have the same kinetic energy.
D The sports car has the most kinetic energy.
Answer:
a
Explanation:
The object with greater mass is having greater kinetic energy. Here, all the objects has the same velocity therefore, the bicycle is having least kinetic energy.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of the motion of the object. The kinetic energy is related to the mass and velocity of the body by the expression below:
KE = 1/2 mv².
As per this equation, kinetic energy increases with an increase in mass or/ and velocity. The substance with greater mass is possessing the greater kinetic energy.
A dump truck has greater mass than a car and bicycle. Thus, at the same velocity for all, the greater kinetic energy is for the truck and the least kinetic energy is for the bicycle having the least mass here. Thus, option A is true.
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Someone pls help me I will make you brain
Answer: It has to be stratosphere because This region of the atmosphere is called the stratosphere. It is present in stratosphere According to NASA earth have 6 atmospheric layers..the layer just above the earth is troposphere and above this layer is the stratosphere.
Explanation:
what is change in science??
Answer:
A transition from one accepted theory to another or from one employed method to another.
Explanation:
What are the relationships among a hydrogen atom's energy levels, sublevels, and atomic
orbitals?
The relationship between an hydrogen atom's energy levels, sublevels and atomic orbitals lies in the fact that hydrogen atom has a shell with energy level of 1 and the energy sublevels are similar as there's only one and have the same energy, and lastly, only one atomic orbital exists in a hydrogen atom
Generally, an atoms energy level, sublevels and atomic orbitals are described by the four quantum numbers if it's Valence electrons.Among laws of atomic theory is the fact that no two electrons can have the same value for all four quantum numbers in an atom.Ultimately, the hydrogen atom has only one electron In the energy level 1, sublevels with equal energy as there are no sublevels in the energy level 1 and only the 1s atomic orbital.
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what is the second most abundant gas in the atmosphere
name the gas produced when nitric acid is added to copper metal
Answer:
Nitrogen dioxide gas
Explanation:
Just need to make sure if this is right
Answer:
yeah think that’s correct
Explanation:
not exactly sure how to explain this, I just know that it’ll prolly just stay the same and not move to any high and low regions of the cell
The region around a nucleus in which electrons are likely to be found is called the
(1 point)
O pudding
O empty space
O atomic orbital
atomic orbit
Which factor of production would tools fall under?
A) Land
B) Labor
C) capital
D) entrepreneurship
Answer:
Capital (20 characteristics nanaman bago masend sagot)
Answer:
C) capital
Explanation:
What is a compound?
a combination of two or more substances that are not chemically combined
a combination of two or more elements that are combined in a certain ratio
Answer:
a combination of two or more elements that are combined in a certain ratio
Explanation:
A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.
What does this picture represent?
А. 0
Hot Plate
B.
Graduated cylinder
С.
Goggles
D.
Electronic Balance
the answer is d electronic balance
How many cm of a solution of 0.100 mol dm NaOH are required to completely -3 neutralize 25.0 cm of 0.250 mol dm H3PO4?. a) Write a balanced equation for the reaction (4 marks) b) How many moles of H3PO4 need to be neutralized? (1 marks) c) How many moles of NaOH are needed to neutralize the H3PO4? (1 marks) d) How many cm of 0.100 mol dm NaOH contain the moles in question 5(©) above? (1 marks)
Answer:
Explanation:
How many cm of a solution of 0.100 mol dm NaOH are required to completely neutralize 25.0 cm of 0.250 mol dm H3PO4?.
a) Write a balanced equation for the reaction NaOH to neutralize (4 marks
?. ) 25.0 cm of 0.250 mol dm H3PO4
H3PO4 + 3NaOH----------> Na3PO4 +3 H2O
b) How many moles of H3PO4 need to be neutralized? (1 marks)
25.0 cm3 of 0.250 mol dm3 H3PO4: 1 liter has 0.25 moles. 100 ml has 0.025 moles 25 ml has o.025/4 molea or 0.00625 moles)
c How many moles of NaOH are needed to neutralize the H3PO4? (1 marks)
for every moles of H3PO4, WE NEED 3 MOLES OF NaOH. FOR 0.00625 MOLES WE NEED 3X 0.00625 =0.01875 MOLES OF NaOH
d) How many cm3 of 0.100 mol /l NaOH contain the moles in question 5(©) above? (1 marks)
1 L CONTAINS 0.100 Moles
100 ml contains 0.010Moles
we need 187.5 ml since (187.5 X 0.100)/1000=0.01875
A cat has volume 40 m3 and density 980 kg/m3. Calculate the mass of the cat.
describe the critical processes by which nitrogen is cycled through the biotic and abiotic components of earth’s ecosystems and identify the primary storage sink for nitrogen.
Nitrogen is one of the major elements that are cycled in nature. The major sink for nitrogen in nature is the atmosphere.
Biogeochemical cycles in nature show the diverse ways that elements move through the various spheres on earth.
Nitrogen is trapped from the atmosphere by nitrogen- fixing bacteria that live in the root noodles of leguminous plants which convert atmospheric nitrogen to nitrates. This nitrogen is transferred to living organisms when they eat those plants and become incorporated into biomass.
Decomposition returns this nitrogen in biomass to the soil. The action of denitrifying bacteria converts nitrates in soil back to atmospheric nitrogen. Also several anthropogenic sources release nitrogen into the atmosphere as NOx.
The atmosphere consists of 78% nitrogen hence it serves as the largest sink for nitrogen in nature.
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Which have different numbers of electrons?
different ions of an element
different isotopes of an element
the nucleus of an element
each of the atoms of an element
Answer: different ions of an element, the answer is A
Explanation: Took the quiz
Answer:
different ions of an element, the answer is A
Explanation:
edge 2022
An effective treatment for some cancerous tumors involves irradiation with fast neutrons.
The neutrons from one treatment source have an average velocity of 5.7 x 10 m/s. If the velocities of individual neutrons are known to within 2% of this value, what is the
uncertainty in the position of one of them?
__m
Here is your answer look at your image below
You will mostly find me in solid form at room temperature.
a
Metal
b
Nonmetal
what is the purpose of the dts other auths and pre audits screen?
Answer:
It allows the traveler to justify questionable expense items.
hope that helped <3
calculate the volume of a box with the following dimensions: length=8 cm
width = 6cm and height = 5 cm
Answer: 240 cm³
Explanation:
Volume of the box = l × w × h
= (8 cm × 6 cm × 5 cm)
= 240 cm³
I will brainless who can answer this all pleaseeeeej
examine the graph to determine half life of strontium -90
Calculate the volume of a clear liquid that has a mass of 20 g and a density of 15.77 g/mL.
Answer:
20 g g/mL. 15.77
Explanation:
i think i answer it
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
We have that the time that will have elapsed when 25.00 grams remains is
T=72hours
From the question we are told
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
Generally the equation for the Half life is mathematically given as
Where
[tex]X=\frac{25}{100}\\\\X=0.25\\\\Therefore\\\\\frac{1}{2}^n=0.25\\\\n=2 half lives[/tex]
Therefore
T=2*36
T=72 hours
Hence
the time that will have elapsed when 25.00 grams remains is
T=72hours
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Answer:
A
Explanation:
Answer:
It's the first one I think "it absorbs the other greenhouse gases and becomes more potent
based on the activity series, which metal dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam or liquid water?
Answer: Iron
Explanation: does not react with water, but hydrochloric acid will dissolve them, displacing the hydrogen from the HCl. Iron reacts with hydrogen chloride to produce iron chloride, FeCl2 — sometimes known as ferrous chloride.
To solve such this we must know the concept of chemical reaction. Iron is the metal, which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When metals react with acid the liberation of hydrogen gas take place. Metal which is at top of reactivity series react with both acid and steam or liquid water. Iron is the only metals which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam or liquid water.
Therefore, iron is the metal, which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam.
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