Answer:
The heart
Blood
Blood vessels
Explanation:
hope this helps
pls mark brainlest
Answer:
The heart, blood, and the blood vessels.
ASAP PLEASE!!!!!!!! Organic chem
Answer:
a. more mosquitos more malaria
b. DDT worked to keep malaria numbers down by killing mosquitos
c. silent spring's great PR campaign got it banned and with the help of the EPA it was banned almost worldwide and if it was not banned manufacturing it stopped
d. it will continue to increase and 100s of millions of dead will be stacked even higher from malaria
Explanation: it is a tragedy, not sure if that is what you were given to read but that is the side that is rarely told
the birds all dying was not correct, it is not a cartcinogen, it doesn't poison the ocean
here is an interesting quote that is rather telling about how some with power make their decisions
My own doubts came when DDT was introduced for civilian use. In Guyana, within two years it had almost eliminated malaria, but at the same time the birth rate had doubled. So my chief quarrel with DDT in hindsight is that it has greatly added to the population problem.
– Alexander King, cofounder of the Club of Rome, 1990
Absolutely horrific, he is saying that the problem with DDT is that it saved lives
A medallion was dropped into 20.0 mL of water. The water level rose to 25.3 mL. What is the volume of the medallion? (Vobj = Vf - Vi)
Answer:
5.3 mL
Explanation:
We solve this problem using Archimede's principle, which states that the volume displaced by a submerged object is equal to the volume of the object.
With that in mind we calculate the volume of water displaced by the medallion:
25.3 mL - 20.0 mL = 5.3 mLAs the medallion displaced 5.3 mL of water when submerged, the volume of the medallion is also 5.3 mL.
(M1)(M2)+(M2)(P2)=(12.000000)(.9890)+(13.003354)(.1100)=amu
Answer:
The answer would most likely be 4.0004
Explanation:
Looking at the Periodic Table, how can you determine if an element is a metal, metalloid or nonmetal?
Answer:
It depends on where it's located on the periodic table.
Explanation:
Metals are on left side of the periodic table except Hydrogen (H), which is a nonmetal, then there's the staircase, which has the metalloids, and on the right of the staircase are the nonmetals.
Using the empirical formula, calculate the formula weight of the compound. Use the periodic table to help you.
Type the correct answer in the box. Round your answer to three decimal places.
Answer:
The formula weight of the compound is
46.069 g/mol.
Explanation:
Determine the molar mass from the empirical formula (C2H6O) by multiplying the molar mass of each element in the compound by the number of atoms of it and adding the resulting masses of the elements:
molar mass of C2H6O = (2 × 12.011 g/mol) + (6 × 1.008 g/mol) + (1 × 15.999 g/mol) = 46.069 g/mol.
Plants use evaporative cooling.
Question 4 options:
True
False
Answer:
true
Explanation:
ever heard of "plant perspiration"?
Salinity is another word for
Question 3 options:
saltiness
density
temperature
depth
Answer:
Saltiness
Explanation:
There is no step-by-step. It h us is what it is.
Which of these would be a good insulator of electricity?
Group of answer choices
Steel
Rubber
Copper
Aluminum
Answer:
Rubber
Explanation:
Answer:
copper
Explanation:
what are the group of magnesium and nitrogen ? write the balanced chemical equation for the reaction between two element . what type of chemical reaction is it .
Explanation:
Magnesium - Group 2
Nitrogen - Group 5
The balanced equation for the reaction is given as;
3Mg + N₂ --> Mg₃N₂
Type of reaction;
Synthesis / Direct Combination
Help ASAP I will mark brainliest to he correct answer
Answer:
513.3 km/h
Explanation:
PLEASE HELP!!!
Used to determine an elements reactivity
A. atomic number
B. atomic mass
C. valence electrons
D. electron cloud
Answer:
it is c
Explanation:
the number of electrons in the outermost shell of an atom determines its reactivity
1. Find the mass of 0.89 mol of CaCl2.
Answer:
97.9
Explanation:
m= n*M
M CaCl2= 40+ 35.5*2= 110
m= 0.89*110= 97.9
The mass of the given mole of [tex]CaCl_2[/tex] is required.
The mass of the given compound is 98.78 g.
Molar mass of [tex]CaCl_2[/tex]
[tex]M=40.078+35.453\times 2=110.984\ \text{g/mol}[/tex]
n = Number of moles = 0.89 mol
Mass is given by
[tex]m=Mn\\\Rightarrow m=110.984\times 0.89\\\Rightarrow m=98.78\ \text{g}[/tex]
The mass of the given compound is 98.78 g.
Learn more:
https://brainly.com/question/14896336
https://brainly.com/question/13798430
help me with this question please !
Answer:
its C
Explanation:
Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. Wind turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity.
Answer: I wanna say B
Explanation:
It makes the most scenes out of all of those answers let me know if im right:)
Calculate the number of moles of nitrogen dioxide, that contain 4.0*1023 nitrogen dioxide molecule.
0.66 mol NO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
4.0 × 10²³ molecules NO₂ (Nitrogen dioxide)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 4.0 \cdot 10^{23} \ molecules \ NO_2(\frac{1 \ mol \ NO_2}{6.022 \cdot 10^{23} \ molecules \ NO_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.664321 \ mol \ NO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
0.664321 mol NO₂ ≈ 0.66 mol NO₂
Most females have one X and one Y (XY) sex chromosome.
true or false
Answer:
falseeee a female has two X's and the male has XY
Explanation:
learned this in biology last year
What causes hydrogen bonding? A.attraction between ions, B.motion of electrons, C.bonding of a covalently bonded hydrogen atom with an unshared electron pair, D.sharing of electron pairs between two adjacent hydrogen atoms
How far does a car travel if its traveling 15 m/s for 28 seconds.
A popsicle melts on a table. Select ALL statements that are true. A The particles gained thermal energy and changed from a solid to a liquid B The particles lost thermal energy and changed from a solid to a liquid C A physical change occurred D A new chemical substance was made when it melted
Answer:
its "a" nd "C" Big Dawg if im wrong im sorry dawg been a min since i took a test like dis
Explanation:
The half reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron?
A.
It is neutralized.
B.
It is oxidized.
C.
It is reduced.
D.
It has dissolved.
E.
It has precipitated.
Answer: C. It is reduced.
Explanation:
Answer:
C
Explanation:
Because it is reduced.
What is condensation ?
Answer:
gvapor or gas to liquid
Explanation:
water which collects as droplets on cold surface when humid air is in contact with it
Given the reaction: 2 H2 + O2 => O2 = 2 H2O.
What is the total mass of water formed when 497.80 g of oxygen reacts with hydrogen?
PLEASE HELP!!!What are the factors of climate change
Answer:
According to The genic variations in atmospheric compositions and proper use of land or the other factors the cahs climate change
Can somebody help me plz
Answer:r=1.2 d=2.4
Explanation:
Radius is half the diameter and the diameter is 2.4 m
Answer:
Divide the 2.4 by 3.14
Explanation:
NUCLEAR REACTIONS
complete the nuclear reaction...
125
125
53
53
y HeeHn
ODRAG
The correct option for the following reaction is [tex]\gamma[/tex].
In the given reaction we can easily see that the reaction is already complete as a nuclear equation. There is no need for the product to balance the equation as it is not a chemical reaction where reactants and products interact to form new substances.
In this question we can see that a radioactive isotope of iodine-125 ( [tex]^{125}_{53} I[/tex] ) is decaying to produce another isotope of iodine-125 ( [tex]^{125}_{53}I[/tex] ) this process is called beta decay.
As no new element is required to balance the reaction we can say that the answer to this is [tex]\gamma[/tex] as it doesn't add up anything to the reaction.
Learn more about Beta decay at:
https://brainly.com/question/22624428
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1. What is the volume
occupied by 20.4 liters of
CO2 at 1200 Torr when it is
at STP
Answer:
Explanation:
From your question you’ll have to assumethat the temperature is constant,since you do not have an initial temperature.
If thats the case thrn you can use;
P1V1=P2V2 to calculate the second volume.
P1=1200 torr
P2=760 torr
V1 = 20.4L
The volume occupied by 20.4 liters of Carbon dioxide (CO₂) at 1200 Torr when it is at Standard temperature pressure is 32.21 L.
How we calculate the volume?Volume of gas can be calculated by arranging the ideal gas equation as:
P₁V₁ = P₂V₂, where
P₁ = given pressure = 1200 Torr
V₁ = given volume = 20.4 L
P₂ = standard pressure = 760 Torr
V₂ = to find?
Here, we consider the moles and temperature of gas is constant, on putting all these value on the above equation we get:
V₂ = (1200 × 20.4) / 760 = 32.21 L
Hence, 32.21 L is the required volume.
To know more about ideal gas equation, visit the below link:
https://brainly.com/question/20348074
In two or more complete sentences describe the relationship between traits, genes, chromosomes and DNA?
Answer:
Chromosomes threads of DNA that make up a twisty, coiled shape. DNA strands carry genes, and traits are influenced by the genes that people get from their biological parents.
Explanation:
I got this from goggle ...
How many grams of H2 will react with 350 g of N2?
Answer:
10.80
Explanation:
As per the equation, let us calculate the mole ratio. N2+3H2→2NH3. As per the equation one mole of nitrogen reacts with 1 mol of hydrogen.
In terms of mass. 28.01 g of nitrogen needs 3 mol of hydrogen or 6.048 g of hydrogen.
We can set up the ratio;
28.01 g of
l
N
2
needs
6.048 g of
l
H
2
1 g of
l
N
2
needs
6.048
28.01
g of
l
H
2
50.0 g of
l
N
2
needs
6.048
×
50.0
28.01
l
g of
l
H
2
=
10.80 g of
l
H
2
An example of a change of state is __________. *
liquid filling a glass
paper burning
ice cubes melting
Answer:
ice cube melting
Explanation:
bcoz it's a chemical change
What is thought to cause the Earth's magnetic field
Answer:
It is caused by currents of electricity that flow in the molten core.
how many moles are in 160.4 grams of calcium hydroxide show work
Answer:
2.1648562314118083
Explanation:
1 mole = 74.09268.
We assume you are converting between grams Calcium Hydroxide and mole.
Plus you will need to round up the number for answer