Answer:
Cells are the basic structural and functional unit of life.
50 pts don't dare to answer wrong or just write irrelevant.
answer must be with explanation. would mark brainliest.
Answer/Explanation:
Part 1 and 3: Test tube 4. The hot water and Acid added to the substance makes it much more reactive, which is the reason why the new substance is bubbling. Hot water allows the particles in a chemical reaction have enough force and more chances to go through actual reaction process. This also caused it to create the most bubbles.
Part 2 and 4: Test tube 1 had the least amount of chemical reactivity. Cold water slows down the amount of times a particle in the substance hits another. This reduces the chance of it reacting and the strength of it's reaction. Test tube 1 was also missing the citric acid. Since acids have low pH it is very reactive with other particles with substances that contain less than 8 valence electrons. Without the acid it doesn't have ad much urge to react with. The lower the pH the better reactivity.
What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?
Ideal Gas Law Formula.
Brainliest?
What are three factors homeowners should consider when choosing the site for a new house?
Answer:
location
topography (quality)
other facilities close by e.g gas station (it is not advisable to live close to a gas station, incase of explosion)
Answer:
school district, daily commute, neighborhood character, property value, nearby amenities
Should future robots be built if they might take away jobs?
Does this action make a physical or chemical change: hydrogen burns in chlorine gas
Answer:
I CANT
Explanation:
Answer:
phisical i think
Explanation:
chemical would be baking powder in a pancake, the pancake would be in turn more brown cause of baking powder mixing with flower.
Will give Brainliest! Can you answer fast?!?
According to Dalton's atomic theory, which of the following best describes an atom?
Can be destroyed
Present in all matter
Composed of elements
Does not contain particles
Answer:
B. Presented in all matter!
Answer:
B- presented in all matter :)
Explanation:
good luck!
HURRYYY!!!!
Convert 7.13 x 10^28 atoms of calcium (Ca) to moles of calcium.
Answer:
118,438.5 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L}\\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.13 \times {10}^{28} }{6.02 \times {10}^{23} } \\ = 118438.538...[/tex]
We have the final answer as
118,438.5 molesHope this helps you
Which 300 this way < or this way >
Answer:
c
Explanation:
that's the direction the truck is moving
electric configuration for calcium
Answer:
this is answer brother
An atom is a neutral particle why
Answer:
Explanation:
an atom is a neutral particle because it contain equal number of positive and negatively charge particle
Answer:
because it consists of the equal number of protons
Precipitation can mean rain, snow or hail. In chemistry, precipitation is the formation of a _________ from _____________?
Answer:
percipitate or sedements from chemical reactions
Match each electron configuration to the correct element. Use the periodic table to determine the number of electrons that each element has. Drag the tiles to the correct boxes to complete the pairs.
Answer:
Explanation:
Edmentum
The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.
The distribution of an element's atoms' electrons throughout several atomic orbitals is symbolically represented by the electronic configuration of that element.
A standardized nomenclature is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript.
The correct matches are:
Zn: [Ar] 3d¹⁰ 4s²
Fe: [Ar] 3d⁶ 4s²
Sn: [Kr] 4d¹⁰5s²5p²
Cl: [Ne] 3s² 3p⁵
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3. Plate movement is caused by heat-related movement in which layer of
the Earth? *
O the inner core
O the outer core
O the mantle
O the crust
Answer:
the plate movement that caused by heat-related movement is the mantle
Explanation:
If an element has no electrons to share and is stable, what family is it found in?
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. If an element with no electrons to share belongs to noble gas family.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Noble gas is the group 18 elements whose octet is complete and they are not ready to give or take electrons from other element. They are very much stable on its own.
Therefore if an element has no electrons to share and is stable then that element belongs to group 18 or noble gas family.
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The gradual temperature change from one season to the next is due to what? view attachment
Answer:
The greenhouse effect
Explanation:
The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.
easy points !
What was the problem with the Dalton model of the atom?
Which scenario would result in a population growth of zero? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration) 12 individuals emigrate, 12 individuals die, 12 individuals are born, 0 individuals immigrate 16 individuals emigrate, 3 individuals die, 13 individuals are born, 0 individuals immigrate 8 individuals emigrate, 0 individuals die, 20 individuals immigrate,12 individuals are born 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Answer:
12 individuals are born 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Explanation:
From the formula:
Population growth = (birth rate + immigration) – (death rate + emigration)
= (b + i) - (d + e)
For the first option, b = 12, i = 0, d = 12, e = 12
population growth = (12+0) - (12+12) = -12
For the second option: b = 13, i = 0, d = 3, e = 16
population growth = (13+0) - (3+16) = -6
For the third option: b = 12, i = 20, d = 0, e = 8
population growth = (12+20) - (0+8) = 24
For the last option: b = 0, i = 14, d = 4, e = 10
population growth = (0+14) - (4+10) = 0
Hence, the last option is the correct option.
Answer:
d because i got a 100%
Explanation:
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20 to 75
Answer:
55°C
Explanation:
original is 20
after gaining heat is 75
75 - 20 = 55
Answer:
17242,5J
Explanation:
Given parameters:
Mass of water = 75g
Initial temperature = 20°C
Final temperature = 75°C
Unknown:
Amount of heat absorbed = ?
Solution
To find the amount of heat absorbed by water;
H = mcΔt
m is the mass
c is the specific heat capacity of water = 4.18J/g°C
Insert the parameters and solve;
H = 75 x 4.18 x (75 - 20)
H = 17242,5J
Which element in the boxes above belongs in column 3 on the periodic table?
Answer: Element 1
Explanation:
If an element has 3 valence shells, then it must be in the third column so element 1 is the right answer. Hope this helps! :)
is nitride on the periodic table
Answer:
yes
Explanation:
Nitride, any of a class of chemical compounds in which nitrogen is combined with an element of similar or lower electronegativity, such as boron, silicon, and most metals.
The question, Is nitride on the periodic table, would have the answer of No as it is not an element.
Why is Nitride not on the periodic table ?The periodic table lists the elements, which are the basic building blocks of matter. Nitride is not an element, but rather a compound that is formed when nitrogen combines with another element.
Nitrogen is a non-metal that is found in group 15 of the periodic table. It has an atomic number of 7, which means that it has 7 protons in its nucleus. Nitrogen is a very reactive element, and it can combine with many other elements to form compounds.
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How many moles of SO3
are in 2.4 x 1024
molecules of S03?
Answer:
2457.6
Explanation:
I calculated the answer and got it right.
PLEASE HELP MEEEE
Africa
Asia (India)
Australia
Europe
Answer:
Australia is correct
Explanation:
Because it is not attached to any other place
i think it's physical changes but ima need a second opinion lol
how are sponges and he coral in coral reefs similar
Answer:
They are both alive organisms. They can breathe and they are known as living creatures. The stay in the same place and food comes to them and they dont hunt for food. They are both like traps.
Explanation:
CH4 + 2 02 - CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
answer: 6.875 moles
nCH4 = nCO2 = 110/(12 + 4) = 6.875
6.875 moles of carbon dioxide are produced from the combustion of 110 g of CH4.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is
[tex]\rm CH_4 + 2O_2 = CO_2 + 2 H_2O[/tex]
To calculate the number of moles, we will use the following formula
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{110g}{12 + 4 } =6.875[/tex]
Thus, the number of moles are 6.875.
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Which of the following represents a process in which a species is reduced?
a) Ca(s) - Ca2+ (aq)
b) Hg() - Hg22+(aq)
c) Fe2+(aq) - Fe3+(aq)
d) NO3 (aq) - NO(9)
e) 5032 (aq) - S04- (aq)
Answer:
D
Explanation:
Option D is the right answer. A substance that has been reduced undergoes chemical reduction. They show the following properties;
Removal oxygen from the species. Option D goes from 3 oxygen to just 1 oxygen. Addition of hydrogen to a specie. Gain of electrons by an atom. Decrease in oxidation number of an atom. Decrease in the number of electronegative atoms surrounding an element in changing from reactants to products.The equation that represents the process of reducing a specie is : ( D )
NO₃ (aq) - NO(g)
The reduction of a specie is a chemical reaction process which involves the removal of oxygen atom(s) and the the addition of hydrogen.
A reduced specie gains/accepts electrons therefore becoming more electronegative ( i.e. the number of electronegative atoms around it is reduced ) and It also experiences a decrease in its oxidation number
From the options provided the number of oxygen present in NO₃ reduces from O₃ to O This makes option D the correct option representing the reduction of specie
Hence we can conclude that the The equation that represents the process of reducing a specie is
NO₃ (aq) - NO(g)
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How does molecular shape affect polarity?
A. If the molecule contains nonpolar bonds, a bent shape will make it
polar.
B. If the molecule contains atoms of similar size, polarity will cancel
out.
C. If the molecule contains more than two bonds, shape will not
affect polarity.
D. If the molecule is symmetrical, the effects of polarity will cancel
out.
Answer:
An attraction between the positive end of one molecule and the negative end of another
Explanation:
The molecular shape affects the polarity as:
A. If the molecule contains nonpolar bonds, a bent shape will make it polar.
Effect of polarity on molecular shape:The sub-atomic math of a particle influences its extremity. Every CO bond has a dipole second, however they point in inverse bearings so the net CO2 atom is nonpolar. Conversely, H2O is polar in nature of the fact that the OH bond minutes don't offset.
Thus, option A is correct.
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HELP PlEASE!! What Causes a glacier to move down a mountain?
A. Rain
B. Gravity
C. Wind
D.Ice
Complete the sentences
( solid, liquid or gas)
What do you notice about the temperature?
(increases or decreases)
What do you notice about the movement of the molecules and the spacing between the molecules?
( INCREASES or DECREASES)
1. When you
click on the yellow button,
The solid becomes
Liquid
The temperature
increases
The movement of the molecules ____increases__________________
and the space between molecules __increasing_____________________
2. When you click on the green button
The liquid becomes
Gas
The temperature
increases
The movement of the molecules ______increases________________
and the space between molecules ________________________
3. Click on the yellow button again
And the gas becomes
liquid
The temperature
decreases
The movement of the molecules ______________________
and the space between molecules ________________________
4. Click on the red button,
And the liquid becomes
The temperature
The movement of the molecules ______________________
and the space between molecules ________________________
Answer:
xcvbn
Explanation:
nkj
Answer:
what he said
Explanation:
Which two rocks contain the mineral quartz?
1.
gabbro and schist
2.
dunite and sandstone
3.
granite and gneiss
4.
pumice and scoria
Answer:
3. Granite and Gneiss.
Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Banded gneisses called migmatites are composed of alternating light colored layers of granite or quartz feldspar and dark layers rich in biotite.
Granite is a purely natural stone that comes directly from stone quarries and is then cut into thin slabs, polished, and fabricated into countertops. So-called quartz countertops are engineered stone products that may contain a large percentage of natural quartz but may also include other minerals.