Answer:
A. to absorb as much sunlight as possible.
Explanation:
Because they are in the understory, it's a constant competition for sunlight to perform photosynthesis, so they need wider leaves to capture what is filtered by canopy trees.
Answer:to absorb as much sunlight as possible
Explanation:
Apple seeds contain a compound that forms cyanide when it comes into contact with enzymes in the
digestive system. According to the CDC, a fatal dose of cyanide for humans is 1. 8mg/kg BW. You measure
2. 0mg of cyanide in a single, crushed-up apple seed. How many apple seeds would you need to ingest to
reach this level the threshold dose? Hint: Don't forget to include your body weight in kg in your calculations). (50 kg weight)
[tex]\tt \dfrac{2}{50}\times x=1.8\\\\x=\dfrac{1.8\times 50}{2}=45~apple~seeds[/tex]
John Snow studied cholera in London in the 1800s. He determine that the source of this epidemic was a contaminated well. In this example, the contaminated well was the
carrier.
host.
reservoir.
pathogen.
Answer:
C -- Reservior
Reservior -- a supply or source of something.
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heating is repeated to ensure all water molecules have evaporated
Mass%
Mass of element/Mass of solution×10025/175+25×10025/200×10025/212.5%Option B
A piece of iron is heated to 120'C then placed in a calorimeter containing 50g of water. The water temperature is raised from 30°C to 40°C. Assuming the specific heat of water is 4. 18 J/8'C and the specific heat of
Iron is 0. 44 J/g C, what is the mass of the piece of iron?
118. 8
59. 45
39. 6
752
Answer:
Mass of iron = 59.375 gm
Explanation:
Calories ( or joules) are added to the water by the hot steel so at the endpoint they are BOTH at 40 C
The water gains:
4.18 j/g-C * 50 * (40-30 C) = 2090 j
The steel gave up 2090 j going from 120 to 40 C
2090 = .44 j/g-C * m * (120-40) solve fro m = 59.375 gm
What is the carbon load (g CO2 per mil fuel) of Gas
Answer:
Mass =116.16 g
Explanation:
Given data:
Moles of CF₄ = 1.32 mol
Mass of CF₄ = ?
Solution:
Molar mass of CF₄= 88 g/mol
Formula:
Number of moles = mass/ molar mass
Number of moles × molar mass = Mass
Mass = 1.32 mol × 88 g/mol
Mass =116.16 g
The form of energy from the sun can be transformed into the energy needed for a tree to grow. What types of energy occur in this transformation?
Question 5 options:
Electromagnetic - mechanical
Potential - kinetic
Light - chemical
Nuclear - thermal
The form of energy from the sun can be transformed into the energy needed for a tree to grow is light to chemical energy.
What is energy transformation?Energy transformation is a process in which one form of energy is transfered into another form without any loss of energy.
Sun provides solar energy to the earth surface and that will be used by plants and trees for the production of food to grow. So that plants will convert the solar energy means light energy into chemical energy for their use.
Hence conversion of light energy to chemical energy takes place.
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Acids or bases can be tested by chemical_________
Answer:
acids or bases can be tested
by chemical indicators
A Fine grained texture and a Coarse grained texture.
B. How is each texture related to the cooling rate?
Please helppp!
Explanation:
Slow cool rate in coarse
Fast cool rate in fine
Which properties are true of petroleum? Select all that apply.
A)Petroleum was once living organisms.
B)Petroleum is found in sedimentary rock.
C)Petroleum is made from silicon based compounds.
D)Petroleum is used to make plastics.
E)Petroleum is used to make petrochemicals.
Petroleum is used to make plastics,Petroleum is used to make petrochemicals,Petroleum is found in sedimentary rock these properties are true of petroleum.
What is mean by Petroleum?Petroleum, also known as crude oil, or simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, and is found in geological formations. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that consist of refined crude oil.Petroleum is used to make plastics,Petroleum is used to make petrochemicals,Petroleum is found in sedimentary rock these properties are true of petroleum.
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How many ml of a 14. 0 m nh3 stock solution are needed to prepare 200 ml of a 4. 20 m dilute nh3 solution?.
Answer:
60 mL
Explanation:
200 mL = 0.2 L
We know that:
Molarity = Moles / Liters
So:
4.20 M = moles / 0.2 L
moles = 4.20 x 0.2 = 0.84
Then:
14.0 M = 0.84 moles / Liters
Liters = 0.84 moles / 14.0 M = 0.06 L
Since they want the answer in mL, convert 0.06 to get 60 mL
According to the World Health Organization (WHO), an estimated 240 million people are chronically infected with hepatitis B. This number describes hepatitis B's
incidence.
prevalence.
mortality.
virulence.
Answer:
A -- incidence -- the occurrence, rate, or frequency of a disease, crime, or something else undesirable.
Explanation:
A student wants to test an unknown chemical solution. What test should they perform to determine whether the chemical is an acid or base?
A.
Test the solution by testing its conductivity
B.
Test the solution by increasing its temperature.
C.
Test the solution by tasting it.
D.
Test the solution's pH by using litmus paper.
Answer: D
Explanation:
The litmus paper will help determine the pH, and thus if it is an acid or a base.
2. When a person gets too cold, his or her body will begin
Shiver
until the body's temperature is back to
normal. In sentences explain why this is an example of
homeostasis.
Answer:
The body will react because your body needs warmness to survive and coldness can make you sick and even kill you.
the atomic number tells you the number of _______ in one atom of an element. It also tells you the number of ______ in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the Periodic Table. No two different elements will have the _____ atomic number.
Answer:
Protons, electrons, same in that order is the answer.
Explanation:
this has to do with the periodic table information.
Protons, electrons and the same are answers to the blanks.
What is a proton?A proton is a subatomic particle found in the nucleus of every atom.
The atomic number tells you the number of Protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the Periodic Table. No two different elements will have the same atomic number.
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What is the effective nuclear charge for magnesium?.
Answer: Heyo Kenji Here! Here's your answer- Mg =1s2 2s2 2p6 3s2 = [Ne]3s2, therefore magnesium has 10 core electrons from its 1s2, 2s2, 2p6 orbitals. Magnesium is element 12, so it has 12 protons and a nuclear charge of 12.
Explanation: Hope this helps!
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Select the correct statement.
Acidic solutions contain no OH - ions.
Basic solutions contain no H + ions.
Basic solution contain no OH - ions.
Basic solutions contain some H + ions.
Answer:
d) basic ions contain some H+ ions got it right
Explanation:
i got it right
If it is 9 am in San Francisco, is it also 9 am in New York? Why or why not?
PLEASE HURRY PLEASE
Answer:
It wouldn't be 9am in New York because San Francisco is 3 hours behind of New York
Explanation:
A gas a temperature of 269.5K. What is the temperature in C°
Answer:
269.5k is equivalent to -3.65 c
Explanation:
1 Kelvin = 1 - 273.15 = -272.15 Celsius
269.5 Kelvin = 269.5 - 273.15 = -3.65 Celsius
hope it helped :)
269.5 K
to find:269.5 K in C°
solution:formula= 0K − 273.15 = -273.1°C
= -3.65 °C.
if you mix baking soad with vinegar what will happen DONT CHEAT will it be a cheimcal reaction or a Physical reation
Answer:
Chemical Reaction
Explanation:
because one is a base and the other is an acid. Baking soda is a basic compound called sodium bicarbonate.
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A balloon contains 6.5 L of helium and has a pressure of 1.5 atm. If the balloon expands to a volume of 10.0 L, what would the pressure be in the balloon?
Answer:
The pressure of the balloon is 0.98 atm
Explanation:
Using the equation P1V1 = P2V2, you can solve for the value of V2, which is 0.98 atm.
(P1V1)/P2 = V2
Plug in the numbers:
(6.5*1.5)/10.00
=0.975 atm
=.98 atm
Empirical formula of a compound is XY2 if its empirical formula weight is equal to its vapour density calculate the molecular formula of the compound.
Explanation:
Hope it helps you!!Gold is an element. Which is
true about gold?
A. It cannot be broken down into another
substance.
B. It cannot be bonded together.
C. It can be broken down into another
Answer:
Gold is dense, soft, shiny, and most malleable of all the metals known. Gold is a transition metal that is attacked by chlorine, fluorine, and cyanide. Gold is the 79th element in the periodic table. it has 79 protons in its nucleus and 79 outter electrons.
Explanation:
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Answer:
The answer should be A. It cannot be broken down into another substance. :)
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How many outer atoms and lone pairs are present in a molecule with a trigonal pyramidal shape?.
Answer:
There are three nuclei and one lone pair, so the molecular geometry is trigonal pyramidal.
Explanation:
Which is the simplest amino acid?
Alanine
Tyrosine
Serine
Glycine
Answer:
Glycine
Explanation:
Glycine is the simplest amino acid and most commonly found in animal proteins.
Hope this helped! Have a nice day!
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Which type of bond shows two or more atoms sharing electrons?.
Answer:
Covalent blood
Explanation:
A covalent bond is the force of attraction that holds together two atoms that share a pair of valence electrons. The shared electrons are attracted to the nuclei of both atoms. This forms a molecule consisting of two or more atoms. Covalent bonds form only between atoms of nonmetals.
A section of a topographic map is shown below
Answer:
1800
Explanation:
2000 - 40(5) = 1800
You are asked to perform an experiment. When you perform the experiment you notice the vessel is warming. What type of reaction is taking place
Exothermic type of reaction is taking place because this type of reaction generates heat energy.
What is exothermic reaction?Exothermic reactions refer to those chemical reactions that produce heat energy and release that heat energy to the surrounding environment.
So we can conclude that exothermic type of reaction is taking place because this type of reaction generates heat energy.
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Which type of chemical reaction occurs in c6h12 9o2 right arrow. 6co2 6h2o? synthesis combustion single replacement double replacement
Balanced chemical reaction: C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O
Answer: Combustion
Explanation: Edge
classify the reaction MgCO3(s) → MgO(s) + CO2(g)
70 POINTS NEED HELP ASAP. ONLY CORRECT ANSWERS PLEASE.
A calorimeter was filled with 200 g of water. The temperature of the water in the calorimeter dropped from 55.0 °Celsius to 22.6 °Celsius. The specific heat of water is 4.184 J/g°C. Calculate, q, the heat released by the reaction.
A. -27,112 J
B. -2710 J
C. 1891 J
D. 18,911 J
Answer:
A
Explanation:
We can use the heat transfer equation:
[tex]\displaystyle q = mC\Delta T[/tex]
Therefore:
[tex]\displaystyle \begin{aligned} q_\text{sol} & = m_\text{sol}C_\text{sol}\Delta T \\ \\ & = (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(22.6\text{ $^\circ$C}-55.0\text{ $^\circ$ C}) \\ \\ &= (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(-32.4\text{ $^\circ$C}) \\ \\ & \approx -27112 \text{ J} \end{aligned}[/tex]
In conclusion, the answer is A.
Note: Assuming that the reaction took place in the water, the heat released by the reaction should be positive instead of negative. Because the temperature of the water decreased, the reaction is endothermic. Hence, the water lost heat (what we calculated above) while the reaction absorbed heat. The heat released (or, rather, absorbed) by the reaction is thus +27,112 J. However, for the purposes of this question, A is the best choice.