Answer:
ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid
Explanation:
i really need help please will give brainliest
Answer:
Astatine is a halogen, Nitrogen is a nonmetal, Krypton is a Nobel gas, Chlorine is a halogen and Sulfur is non metal
Explanation:
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coefficients to lowest possible
ratio, if necessary.
Which best explains how convection affects the atmosphere
Answer:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds
How many liters of NO2 are in 80.0 grams at STP
Answer: answwer is22.4 L
At STP that is standard temperature and pressure 22.4 liters of NO₂ are present in 80 grams.
What is standard temperature and standard pressure?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.
These values are important to physicists, chemists ,engineers ,pilots and navigators.
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why should scientists perform expierements
Answer:
Experiments are most useful when investigating predictions derived from explicit theories, and it is theories, rather than experimental results, that are properly used to explain features of natural settings.
Answer:
to explore new possibilities
hope it helps
Waves often bounce off objects such as water. What is this form of wave movement called?
A.
reflection
B.
refraction
C.
interference
D.
resonance
Answer:
Reflection
Explanation:
Reflection is when something is bounced off something else such as light bouncing off objects therefore the waves are reflecting. Also when light bounces off of a surface it reflects rather than refraction which refers to the light bending as it enters a new medium
oven mitts reduce which type of thermal energy transfer when you take a hot pan out of an oven
Answer:
conduction
Explanation:
Conduction is a form of thermal energy transferred through direct contact. Using an oven mitt reduces the amount of heat transferred:)
Answer:
The answer is Conduction.
Explanation:
I took AP3X quiz. Hope this helps.
Arrange the following elements in order from lowest to highest first ionization energy : , Ar , Cs, Na *
Answer:
Lowest Cs, Na, highest is At
Explanation:
a metal worker uses a cutting torch that operates by reacting acetylene gas, C2H2(g), with oxygen gas, O2(g), as shown in the unbalanced equation below: C2H2(g)=O2(g)= CO2(g) = H2O(g) = heat determine the mass of 25 moles of acetylene (gram-formula mass = 26 g/mol
Answer:
650 grams
Explanation:
Given that acetylene gas reacts with oxygen to produce caobon dioxide, water and heat and the unbalnced equation is
[tex]C_2H_2(g)+O_2(g) \rightarrow CO_2(g) + H_2O(g)+ heat[/tex]
Gram-formula mass of [tex]C_2H_2= 26[/tex] g/mol
So, mass of 1 mole of acelylene is 26 grams
Therefore, mass of 25 moles of acelylene=25x26=650 grams
Hence, the mass of 25 moles of acelylene is 650 grams
The mass of 25 moles of acetylene has been 0.65 kg.
Moles are the count of a number of molecules in an entity and the mass based on the formula mass. 1 mole of a substance has [tex]\rm 6.023\;\times\;10^2^3[/tex] molecules.
The moles can be calculated as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Given, mole of acetylene = 25 mol
molecular mass of acetylene = 26 g/mol
Mass of acetylene = moles [tex]\times[/tex] molecular weight
Mass of acetylene = 25 [tex]\times[/tex] 26
Mass of acetylene = 650 grams
1000 grams = 1 kg
650 grams = 0.65 kg.
The mass of 25 moles of acetylene has been 0.65 kg.
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All objects have mass
O True
O False
When a candle burns, the reaction produces:
• oxygen and water
• carbon dioxide and wax
• wax and oxygen
• carbon dioxide and water vapor
Answer:
B
Explanation:
Hope this helps you
Coefficients are used in a chemical formula to show the number of each element. True or False
Answer:
The same number of each element present before the reaction takes place must also be present on the product side of the equation. Coefficients are placed in front of a chemical formula to show the number of moles of that substances that are necessary for the reaction to occur.
Explanation:
What is the freezing point of neon F and C?
Answer:
-415.5°F and -246°C
Explanation:
Science hmk due tmr morning need help!! pls answer all 3 and number which one is which for example...
1.j
2.j
3.j
which type of energy would most likely create the worst environment disaster from an accident or spill
Answer:
the dessert
Explanation:
because it is dry and very few anmals live there
What type of rock is this?
Answer:
I'm gonna say igneous
Explanation:
The texture looks rough and the rock looks like it's composed of different types of minerals making it an igneous rock
I hope this helps :)
Answer: Igneous
Explanation: Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.
Which form of energy can be connected closely to climate change?
hydroelectric
coal
solar
wind
Answer:
coal
Explanation:
Hope this helps please mark brainliest
The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things. Potential energy and kinetic energy are the two categories of energy.
Which source of energy has a direct impact on climate change?Renewable energy is frequently cited as the most important shift the world can make to fend off the worst consequences of global warming. This is due to the fact that renewable energy sources like solar and wind don't produce greenhouse gases like carbon dioxide, which contributes to global warming.
Wind, sunlight, bioenergy (organic matter burned as fuel), and hydroelectricity, including tidal energy, are a few examples of renewable energy sources.
The ability to exert a force that causes an object to move is what the definition of energy as "power to accomplish work" refers to. Despite the ambiguity of the definition, the meaning is clear: energy is simply the force that moves things. The two types of energy are potential energy and kinetic energy.
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Which of the following atoms has the largest radius?
a. lithium
b. lead
C. cesium
d. fluorine
e. carbon
Explanation:
first one, a. lithium. it's the largest
Determine the atomic number, atomic mass and element name of the following:
14 N
14
7
Answer:
Carbon-14
Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14.
Based on the diagram shown, how many electrons does this atom have?
a.six
b.three
c.nine
d.one
Answer:
B. Three
Explanation:
The three dots that are surrounding the nucleus are electrons.
Explanation:
According to the diagram, the atom has 3 electrons.
Electronic configuration =
1s² 2s¹
Element = LithiumSymbol = LiPeriod = 2Group = 1 (Alkali metal) valency = 1Therefore,
Option B is correct✔
Explain, in your own words, what an electron configuration shows :
What are the characteristics of a neutron
Answer:
The no. Of neurons are equal to the number of protons
Which sentence needs to be broken into two separate sentences?
Science fiction was not Barry's favorite genre, so he looked for a short book to read.
When Barry finished reading the novel, he decided that he liked science fiction after all.
The novel Barry chose was so short that he read it in one night it was that good too.
Barry's teacher told the class that they would have to read a science fiction novel
Answer:
The third sentence.
Explanation:
It could be: The novel Barry chose was so short that he read it in one night. It was that good too.
Or
The novel Barry chose was so short that he read it in one night; it was that good too.
Answer:
The novel Barry chose was so short that he read it in one night it was that good too.
Explanation
Which of these is an example of a biotic factor?
hot desert sun
Mojave River
acrid desert air
Mojave grasshoppers
Answer: Mojave grasshopper
Explanation: this is the answer because it is living
Why packaging lemons in cans might not be a good idea?
A reaction begins with 130.5g of substance X and substance Y. How many grams of
substance X and Y are there at the end of the reaction?
A) not enough information provided
B) 100g
C) 65.25g
D) 130.5g
Answer:
130.5g
Explanation:
At the of the reaction, the combined mass of X and Y will be 130.5g.
The premise for this conclusion is based on the law of conservation of matter.
This law states that "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".
In essence, in a chemical reaction, there is no mass loss.
The amount of product in the reaction is expected to be the same as the amount of reactants used in the experiment. When we start with 130.5g then we should end with 130.5gThe rate of a chemical reaction is NOT affected by which of the following:
A.temperature
B.particle size (surface area)
C.concentration
D.All of these affect reaction rates
Answer:
Option B
Explanation:
Option (B) Particle size
Using the diagram to guide your answer, which of the following statements are true? Choose all that apply.
I The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen
The products (final) contain two atoms of nitrogen and six atoms of hydrogen
I The number of atoms is the same in the initial and final boxes
2 molecules of nitrogen react with 3 molecules of hydrogen to produce 2 molecules of ammonia
The number of molecules is the same in the initial and final boxes
Answer: The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen
The products (final) contain two atoms of nitrogen and six atoms of hydrogen
The number of atoms is the same in the initial and final boxes
Explanation:
Atom is the smallest unit of an element which may or may not exist independently.
Molecule is the smallest unit of a pure substance that consists of two or more atoms held together by a chemical bond .
Molecule of a Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. Example: [tex]NH_3[/tex]
Molecule of an element is a pure substance formed by combination of same types of atoms bonded by a chemical bond. Example: [tex]H_2[/tex] and [tex]N_2[/tex]
Here one molecule of nitrogen ([tex]N_2[/tex]) combines with 3 molecules of hydrogen ([tex]H_2[/tex]) to give 2 molecules of ammonia. ([tex]NH_3[/tex]).
The __________________ is the process by which gases in the atmosphere absorb and reradiate heat.
Answer:
I am sure it is the greenhouse effect
Explanation:
Answer:
the greenhouse effect
I think this is the answer. Pls correct me if I'm wrong.
Need answer ASAP!!
Which of the following elements has the greatest atomic radius? *
A) Mg
B) Sr
C) Ca
D) Ba