Answer:
glucose and oxygen
Explanation:
Glucose and oxygen are needed for cellular respiration to occur:)
19) Which one of the following statements describes a chemical property of hydrogen gas?
A) Hydrogen gas has a density of 0.00009 g/cm’ at STP.
B) Hydrogen gas burns in air.
C) Hydrogen gas has a boiling point of 20. K at standard pressure.
D) Hydrogen gas is colorless.
How can we prepare a weak acid from
carbondioxide ? Write with chemical equation
SAP
Answer:
H2O+CO2--------> H2CO3
Answer:
Carbonic acid- H2CO3
Explanation:
Water+co2 gives H2CO3
H2CO3 is an acid, which Carbonic acid that is H2CO3 is a weak acid
It decomposes into CO2 and H2O
If you squeeze a sealed bottle in the middle, what force is applied at the top of the bottle?
A) less force
B) more force
C) the same force
D) cannot be predicted
Just help please
And does anybody know Johnny from NCT
What can be concluded from the following statements about a property of metats? • Acast-iron skillet on a stove is used to try bacon • A metal spoon left in a pot of soup heating on a stove is too hot to touch - An aluminum playground slide gets hot on a summer day. O A Metals combine with nonmetals.O B. Metals are good insulators. O C Metals conduct electricity D Metals conduct heat.
Answer:
D - metals conduct heat
pls help, what is this compound called?
Answer:
Ammonium
Explanation:
ammonium is a compound because it has 2 elements
Generally, when food is cooked:
choose all that apply
The food absorbs energy.
An exothermic reaction takes place in the food.
An endothermic reaction takes place in the food.
Answer:
An exothermic reaction takes place in the food
2) Why do some earthquakes cause more damage than others?
Answer:
Earthquakes are more intense the faster the planet's crust slams together, which explains why the shaking causes so much damage in some of the most populated areas around mountain chains. ... One reason for this connection is that when two plates come together quickly, the area over which an earthquake occurs is larger.Explanation:
Based on the methods used in the video, answer the following gram to gram conversion question:
2 C2H6 + 7 O2 --------> 4 CO2 + 6 H2O
In the combustion of ethane (C2H6), 4.12 grams of water (H2O) was produced. How much ethane (C2H6), in grams, was used in this reaction?
molar mass H2O= 18.02 g/mol
molar mass C2H6= 30.08 g/mol
2.47 g C2H6
2.29 g C2H6
20.63 g C2H6
20.97 g C2H6
Answer:B
Explanation:
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Answer: 2 The Proximity toward the ocean
Explanation:
May i plz have brainiest
Energy is transferred
between the ocean and the
air to make sure that the
temperature in the air is
higher than the temperature
on the surface.
True or false
which of the following represents the atoms of 2 different elements?
Answer:
B
Explanation:
1. the moderns periodic table, elements are ordered
a. according to decreasing atomic mass
b. according to mendeleev's original design
c. according to increasing atomic number
Answer:
In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom In a periodic table arranged in order of increasing
If the [H3O+] of a solution is less than the [OH-], what can be said about the solution?
(A) The solution would have a higher pH than its pOH.
(B) The solution could still have a neutral pH.
(C) The solution would have a higher pOH than its pH.
(D) The solution would be basic only if the solution contained a weak acid.
Answer:
I was looking for this same answer.
Explanation:
If the [H₃O⁺] of a solution is less than the [OH⁻], then the solution would have a higher pH than its pOH.
How pOH is define?pOH is define as the negative logarithm of the concentration of OH⁻ ion and for a basic solution its value should be less than 7.
In the question it is clear that concentration of H⁺ ion is les than the concentration of OH⁻ ion, so the given solution is basic in nature. Basicity of basic solution is calculated by using the pOH scale and for this solution value of pOH is less than 7, because more than 7 shows the acidic character. And according to the pH scale value of this solution should be more than 7.
Hence, option (A) is correct i.e. The solution would have a higher pH than its pOH.
To know more about pOH scale, visit the below link:
https://brainly.com/question/854299
A 30L sample of N2 at 20*C is heated to 50*C. The pressure at 20*C was at 3 atm. What is the pressure of N2 after its temperature increased?
Volume stays constant, so: P1/T1 = P2/T2
P1 = 3 atm
T1 = 20*C = 293 K
P2 = ?
T2 = 50*C = 323 K
Solve for P2: P1T2/T1 = P2
P2 = (3 atm)(323 K)/(293 K) = 3.3 atm
The Pressure of N2 after its temperature increased will be "3.3 atm". To understand the calculation, check below.
Pressure and Temperature:According to the question,
Pressure, P₁ = 3 atm
Temperature, T₁ = 20°C or,
= 293 K
T₂ = 50°C or,
= 323 K
We know the relation,
→ [tex]\frac{P_1}{T_1}[/tex] = [tex]\frac{P_2}{T_2}[/tex]
or,
Pressure, P₂ = [tex]\frac{P_1\times T_2}{T_1}[/tex]
By substituting the values,
= [tex]\frac{3\times 323}{293}[/tex]
= [tex]\frac{969}{293}[/tex]
= 3.3 atm
Thus the above response is correct.
Find out more information about pressure here:
https://brainly.com/question/26040104
30 points if you tell me your favorite food! ☺️
Answer:
Pizza, salad, tacos, burgers, etc.
Explanation:
:D
What is the molarity of a solution containing 12.0 g of NaOH in 250.0 mL of solution?
Answer:
1.196 M NaOH
Explanation:
Molarity = moles/Volume (L)
moles NaOH = mass NaOH/MM NaOH = 12/40.01 = 0.299 moles NaOH
Volume solution = 250 mL = 0.250L
M = 0.299/0.250=1.196 M NaOH
What pressure is required to compress 196.0 liters of air at 1.00 atmosphere into a cylinder whose volume is 26.0 liters?
Answer:
if volume of the gas increases, its pressure decreases, and vice versa. mathematically, if the volume of the gas is
V
1
and its pressure is
P
1
. Let us suppose that its volume has been increased to
V
2
, the as per the Boyle's law its pressure will decrease and let us assume the new pressure is
P
2
.
P
1
V
1
=
P
2
V
2
P
1
= 1 atm
V
1
= 196 L
P
2
= ?
V
2
= 26 L substitute the values;
1 atm x 196 L =
P
2
x 26 L
P
2
= 1 atm x 196 L / 26 L
P
2
= 196 atm L / 26 L = 7.53 atm
Explanation:
I hope this helps.
Answer:
7.53 atm
Explanation:
Boyle studied the relationship between the pressure of a trapped gas and its volume. The data obtained by him shows that the product of pressure and volume for the trapped air sample is constant at a constant temperature. if volume of the gas increases, its pressure decreases, and vice versa. mathematically, if the volume of the gas is V 1 and its pressure is P 1 . Let us suppose that its volume has been increased to V 2 , the as per the Boyle's law its pressure will decrease and let us assume the new pressure is P 2 . P 1 V 1 = P 2 V 2 P 1 = 1 atm V 1 = 196 L P 2 = ? V 2 = 26 L substitute the values; 1 atm x 196 L = P 2 x 26 L P 2 = 1 atm x 196 L / 26 L P 2 = 196 atm L / 26 L = 7.53 atm
50g of potassium chloride is dissolved in 500 cm3 of water. Calculate the concentration of the solution. Give your answer in g/dm3
There are three factors in which natural selection occurs. Select one statement from the list below that is a true statement about natural selection.
Answer: There is no list in your question. But the three factors in which natural selection occurs are:
1. A struggle for existence,
2. Variation and
3. Inheritance
Explanation:
Darwin’s theory of natural selection is the way in which organisms change overtime.
These changes allow organisms to become better adapted to their environment and increase their chances for survival.
The three major factors through which natural selection occurs are:
1. A struggle for existence,
2. Variation and
3. Inheritance
Darwin’s theory of natural selection will occur if the three conditions above are met and unless these factors are in place, natural selection will not occur.
Which diagram represents matter with a definite volume but no
definite shape?
i think it is Substance C
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!! THIS IS DUE IN 10 MINUTES!!!!!
Forensic chemists are analyzing blood samples taken from a murder victim. They run tests for any trace of substances that do not naturally occur in the bloodstream. Nothing odd registers but they do find extremely high levels of caffeine. What does this most likely indicate about the murder victim?
A) They drank a lot of coffee.
B) They worked on a coffee bean plantation.
C) They were poisoned with powdered caffeine.
D) Someone put arsenic in their coffee.
Answer:
c
Explanation:
Answer:they were poisoned with powdered caffeine (C)
Explanation:
I just took the test! And got all the points for this question :) hoped I could help
bromine water can be used to distinguish between these two molecules?? true or false
Answer:i dkd
Explanation:
jsach
In the levels of organization of an organism, what does a group of cells make up?
Answer:
they make tissue. form organ and whole body an i true..
The following diagram shows a single cell. Is the cell eukaryotic or prokaryotic? Explain your reasoning. *
Answer:
because it is a single cell. Cell A, because a nuclear membrane contains the cell’s DNA. Cell B, because it is much smaller. Cell B, because it contains genetic material
Explanation:
What three sedimentary rocks form from chemical precipitates and evaporites?
Answer: Rocks formed in this way include halite, gypsum, anhydrite, and some limestones. Layers of precipitated rocks are called evaporite deposits because they typically form where evaporation is high in arid regions like the desert southwest and in the eastern Mediterranean.
Explanation:
The three sedimentary rocks form from chemical precipitates and evaporites are halite, gypsum and anhydrite.
What are sedimentary rocks?Pre-existing rocks or bits of once-living animals constitute sedimentary rocks. They are formed by the accumulation of sediments on the Earth's surface.
Halite, gypsum, anhydrite, and various limestones are examples of such rocks. Evaporite deposits are layers of precipitated rocks that occur in arid locations like the desert southwest and the eastern Mediterranean where evaporation is considerable.
Hence three sedimentary rocks are Halite, gypsum and anhydrite.
To know more about sedimentary rocks, visit the below link:
https://brainly.com/question/195844
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The enzyme amylase will affect the breakdown of carbohydrates, but it will not affect the breakdown of proteins. The ability of an enzyme molecule to interact with specific molecules is most directly determined by the
Answer:
Shape of the enzyme and its active site
Explanation:
A water solution containing an unknown quantity of a
nonelectrolyte solute is found to have a freezing point of
–0.23°C. What is the molal concentration of the solution?
Answer:
The molal concentration of the solution is approximately 0.124 molal
Explanation:
The given parameters are;
The reduced freezing point of the water = -0.23°C
For freezing point depression of a solution, we have;
[tex]\Delta T_f[/tex] = [tex]K_f[/tex]· b·i
Where;
[tex]\Delta T_f[/tex] = The freezing point depression
[tex]K_f[/tex] = Cyroscopic constant (The freezing-point depression constant) = 1.86° Cm⁻¹ for water
b = The molality of the solution
i = van't Hoff factor = 1
Therefore;
[tex]\Delta T_f[/tex] = [tex]T^{\circ}_f - T_f[/tex]
Where;
[tex]T^{\circ}_f[/tex] = The freezing point of pure water = 0°C
[tex]T_f[/tex] = The freezing point of the solution = -0.23°C
∴ [tex]\Delta T_f[/tex] = [tex]T^{\circ}_f - T_f[/tex] = 0°C - (-0.23°C) = 0.23 °C
From, [tex]\Delta T_f[/tex] = [tex]K_f[/tex]· b·i, we have;
0.23°C = 1.86°C/m × b × 1
∴ b = (0.23°C/1.86°C/m) ≈ 0.124 molal
Therefore, the molal concentration of the solution, b ≈ 0.124 molal.
how many atoms are in 1.6g C? Answer in units of atoms.
(no answer choices were given)
Answer:
6.022 ×10(index 23) / 7.5 = 0.8293 ×10(index 23)
Explanation:
molar mass of C = 12gmol
therefore in 12g of C there is one mole or an amount of 6.022 ×10(index 23)
∴12g/6.02210(index 23) ×1.6g
A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon ?
Answer:
A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon? A It would cause the wagon to move faster.
Explanation:
Hoped this helped you guys!