When would it be appropriate to use a model instead of a controlled experiment
a
is the correct answer
*blank* carry blood away from the heart, while *blank* carry blood back to the heart.
fill in the blank spaces...
A. capillaries
B. arteries
C. Blood vessels
D. Veins
Answer:
i think its C im not so sure
Explanation:
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Explain how Earth is heated through radiation
Answer:
Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.
what happens to the electronegatity when you go from top to bottom on the periodic table?
Answer:
It decreases
Explanation:
As you go down a group from top to bottom, the electronegativity decreases. Across a period, electronegativity increases from left to right.
Electronegativity is the tendency with which the atoms of the element attracts valence electrons in a chemical bond. The more electronegative an element is, the stronger its affinity for electrons. Electronegativity values less than 2 shows an element is a metal. Metals are generally electropositive.Determine the mass of 2.86 mole Co(NH3)6Cl3
Answer:
765 g Co(NH₃)₆Cl₃
General Formulas and Concepts:
Reading the Periodic Table of ElementsExplanation:
Step 1: Define
2.86 mol Co(NH₃)₆Cl₃
Step 2: Define conversions
Molar Mass of Co - 58.93 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of Co(NH₃)₆Cl₃ - 58.93 + 6(14.01) + 18(1.01) + 3(35.45) = 267.52 g/mol
Step 3: Dimensional Analysis
[tex]2.86 \ mol \ Co(NH_3)_6Cl_3(\frac{267.52 \ g \ Co(NH_3)_6Cl_3}{1 \ mol \ Co(NH_3)_6Cl_3} )[/tex] = 765.107 g Co(NH₃)₆Cl₃
mol Co(NH₃)₆Cl₃ and mol Co(NH₃)₆Cl₃ cancel outWe are left with grams (mass)Step 4: Simplify
We are given 3 sig figs. Follow sig fig rules.
765.107 g Co(NH₃)₆Cl₃ ≈ 765 g Co(NH₃)₆Cl₃
If you wanted to change the polarity of hydrogen bromide (HBr) by substituting the bromine by a different atom. Which atom would increase the polarity of the molecule?
Answer:
Chlorine
Explanation:
The Polarity of an atom is characterized as the dipole to dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule. Thus, the 'chlorine' atom would help in enhancing the polarity of hydrogen bromide(HBr) with 3.16 electronegativity as we know, the electronegativity increases if we move upwards in the periodic table.
This is a science question. What is the skateboarder’s acceleration?
Answer:
2.4
Explanation:
Divide 7.0 by 3.0 you get 2.333333 then round it of to 2.34
Select The on that most applys
Will mark brainliest
Answer:
A and b
Explanation:
Please help! I’ll mark brainliest for best answer!
Answer:
The Atomic Number
Explanation:
The X would be the Atomic Number or amount of protons sorrounding the nucleus of that atom.
please help ASAPPP
will mark brainliest!!!
The polyatomic ions are those ions which has more than two atoms involved such as the other options than OH^-1 in the question. The OH^-1 ion is the diatomic ion because it has only 2 atoms
______________________________________HOPE IT HELPS!What happens to the dry ice after sometime?
Answer:
As a rough rule, five pounds of dry ice will turn from a solid to a gas in 24 hours. It's best to pick up the block of ice just a few hours before your party so it's as frozen as possible when the bash starts.
Explanation:
True or False: Plants don't have brains, but they still adapt to their environments.
Answer:
True
Explanation:
I just took that last year, and got a100%
True, Plants don't have brains, but they still adapt to their environments.
What is adaptation?Adaptation is a process where they are changing their nature to suit the environment.
We have seen that plants do adaptation according to the environment, as in the summer season their leaves are hanging down but in the rainy season they show blossoms and green leaves. So, according to the environment for the survival and reproduction they adapt their body.
Hence, plants have no brains, but they still adapt.
To learn more about adaptation, visit the below link:
https://brainly.com/question/2396978
Explain What is an elementary reaction and how is it related to a reaction mechanism
Answer:
The sequence of individual steps, or elementary reactions, by which reactants are converted into products during the course of a reaction is called the reaction mechanism. The overall rate of a reaction is determined by the rate of the slowest step, called the rate-determining step.
Explanation:
The reaction for the combustion of acetylene is shown. Explain why this reaction is a redox reaction by identifying the oxidation numbers that change, what is oxidized, what is reduced, and what happens to the electrons during the reaction. 2C2H2 + 5O2 → 4CO2 + 2H2O
Answer:
2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O (l)
Explanation:
Redox reaction: In this type of reaction, oxidation and reduction reaction occurs simultaneously in same chemical reaction.
2C_2H_2+5O_2\rightarrow 4CO_2 + 2H_2O2C
2
H
2
+5O
2
→4CO
2
+2H
2
O
This reaction is a redox reaction :
Removal of hydrogen or addition of oxygen is termed as oxidation. in above reaction, removal hydrogen from acetylene gives carbon-dioxide.
Removal of oxygen or addition of hydrogen is termed as reduction. in above reaction, removal of one oxygen atom from oxygen molecule with addition of two hydrogen atoms gives water
The oxidation number of carbon in acetylene is -2.
The oxidation number of carbon in carbon-dioxide= +4
Oxidation number of carbon increases after the reaction which means that carbon is getting oxidized.
The oxidation number of oxygen in oxygen gas = 0
The oxidation number of oxygen in water = -2
Oxidation number of oxygen decreases after the reaction which means that oxygen is getting reduced.
The electrons released during oxidation are transferred to the species which are undergoing reduction reaction.
Answer:
Just put this, or something like it:
The oxidation number of carbon changes from -1 to +4.
The oxidation number of oxygen changes from 0 to -2.
Carbon is oxidized.
Oxygen is reduced.
Electrons are transferred from carbon to oxygen.
Explanation:
The mass of a block is 2.5 g the volume of the block is 4.1 mL.  what is the density of the block
Answer:
6.6g
Explanation:
I need help (yes again)
Answer:
with what?
Explanation:
The density of water is 1.00 g/mL. Which substance below can float on water?
Answer:
ice, air, ducks and fabric
Explanation:
its common sense
If you triple the force on an object , the acceleration will
a
reduced by 1/3
b
double
c
tripled
d
halve
Answer:
C triple
Explanation:
please crown me
Copernicus challenged the way in which people of his time thought about the solar system. How did Copernicus describe the motion of the sun?
A.The sun is stationary.
B.The sun revolves around Earth.
C.The sun moves in an elliptical orbit.
D.The sun moves in a straight line through space.
Answer:
A. The sun is stationary and we rotate around it.
Hope This Helps!
Answer:
A
Explanation:
the sun is stationary
HELP! will mark brainliest if gotten right
I need help ASAP ... please
Answer:
help with what?
Question 6 (1 point)
Sound, earthquakes, and waves in water are rechanical waves because they require
a physical to transport energy. (Lesson 4.02)
O electromagnetic field
O disturbance
O medium
location
Answer: The answer is MEDUIM
Explanation:
True or False Gases do have a definite shape and volume.
Answer:
false
Explanation:
Answer:
False
Explanation:
It is false as the particles of gases keep moving. They have very weak molecular bonds. They are so weak that they can move freely anywhere and in any direction. Even if you trap some gases and a closed bottle, they keep moving. We can't measure what the shape is or what the volume is. Therefore, it is false.
Hope this is helpful and mark it Brainliest if possible! Good Luck!!!
Could cellular respiration
happen without photosynthesis? Explain your
reasoning
Answer:
No
Explanation:
Without photosynthesis, there would be no sugar, without which there could be no cellular respiration.Both animal cells and plant cells depend on cellular respiration for their energy needs, because both animal cells and plant cells need ATP.
3. How are the protons held in the
nucleus?
O opposite charges
O strong nuclear force from neutrons
Owhich nuclear wall
What cause a earthquake
Answer:
Sudden motions in Earths mantle causeing the crust to shift.
Explanation:
What are the two parts of an atom ?
Answer:
The nucleus and the outer region.
Explanation:
How many total atoms are in K2(H2AsO4)2
5
18
16
12
Answer:
18
Explanation:
go go evhdj kk nm go go go
The tendency of an atom to attract electrons to itself is ionization energy. effective nuclear charge. electron affinity. electronegativity.
Answer:
electronegativity
Explanation:
Answer:
THe tendoncy is electronegstivity
Explanation:
Im a big brain person
Why would farmers in the United States be especially concerned about a decrease in ground water?
Answer:
yes probably
Explanation:
the decrease would affect the plants growing in the ground cause there is no access water they can get
