Answer:
control group
Explanation:
Answer:
control book
Explanation:
I found it online and it's very helpful
can somebody please help me with this question please
Answer: D
Explanation:
An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as the result of its position. When assuming its usual position (i.e., when not drawn), there is no energy stored in the bow. Yet when its position is altered from its usual equilibrium position, the bow is able to store energy by virtue of its position. This stored energy of position is referred to as potential energy. Potential energy is the stored energy of position possessed by an object. https://taraenergy.com/blog/an-introduction-to-potential-energy/
Match each organism to its part in the food chain.
people:
deer:
horse:
snake:
goldfish:
grass:
lion:
bacteria:
Answer:
Explanation:
Grass. Producer
Goldfish. Pri. Consumer and Herbivores
Deer. Pri. Consumer and Herbivores
Horse. Pri. Consumer and Herbivores
Snake. Sec. Consumer and Carnivores
Lion. Tert. Consumer and
carnivores
People Pri. Sec. and tert. Consumers
Bacteria. Decomposers
a solution has a pH of 2. What best describes the solution?
a strong acid
a strong base
a neutral solution
a weak base
What metal is often extracted and purified from its ore using both smelting and electrolysis?
Answer:
Aluminium
Explanation:
The bauxite is purified to yield a white powder – aluminium oxide (also known as alumina) – from which aluminium can be extracted.
dose PLA Plastic float?
Answer:
No, it should sink
Explanation:
How many moles are in 2. 5 g of N2? 0. 089 moles 0. 18 moles 1. 3 moles 11 moles.
Answer:
moles = mass divided by molar mass
Molar mass of Nitrogen gas (N2) = 14*2 = 28 g/mol
Mass of Nitrogen gas = 5g
Moles = 5/28
Moles = 0.18 (rounded)
What is the coefficient for iodide ions (I-) when the equation is balanced?
Answer:
When the following redox equation is balanced with smallest whole number coefficients, the coefficient for the iodide ion will be __6__.
Explanation:
From the redox equation, we can see that NO₃⁻ is reduced to NO (from oxidation state +5 to +2), whereas I⁻ is oxidized to I₂ (from oxidation state -1 to 0). The half reactions are balanced with H⁺ (acidic solution), as follows:
Reduction : 2 x (NO₃⁻(aq) + 3 e- + 4 H⁺ → NO(g) + 2 H₂O)
Oxidation : 3 x (2 I⁻(aq) → I₂(s) + 2 e-)
----------------------------------------------------------------------
Total equation: 6 I⁻(aq) + 2 NO₃⁻(aq)+ 8 H⁺ → 3 I₂(s) + 2 NO(g) + 4 H₂O
That is the redox equation with the smallest whole number coefficients.
Accordin to this, the coefficient for the iodide ion (I⁻) is: 6.
in a compressional wave, when the particles are far apart, what is the part known as
Answer:
The answer is: "Rarefactions"
Explanation:
In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. Places where particles of a medium crowd closer together are called compressions, and places where the particles spread farther apart are called rarefactions.
How are force, mass, and velocity related in collisions?
Answer:
force=d/t, n
Mass=v/t
velocity=m/d
Someone pls help me :( tysm if u do
Density is mass/volume.
Let's find the volume.
Volume = lwh = (2)(2)(2) = 8
The volume is 8 and the mass is 16.
D = m/v
D = 16/8
D = 2
2 grams per cm^3
Calculate the frequency of 4.1 x 10^-19
16. Which is NOT true of an atom obeying the
octet rule?
A. obtains a full set of eight valence electrons
B. acquires the valence configuration of a noble gas
C. electron configuration is unusually stable
D. has an s'p valence configuration
E. will lose electrons
Lures
The statement that is not true in the list of options is that an atom that is obeying the octet rule will loose electrons. An atom that is obeying the octet rule will neither loose nor gain electrons.
According to the octet rule, an atom is stable when it has eight electrons in its outermost shell. We must note that stability of atoms is the driving force for all chemical reactions.
Hence, the statement that is not true in the list of options is that an atom that is obeying the octet rule will loose electrons.
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Which of the following is NOT a benefit of renewable energy? *
O generates power on smaller scale
O can decrease pollution
O combats climate change
Answer:
O generates power on a smaller scale
Explanation:
The other two options are benefits of renewable energy. You're looking for a con instead of a pro.
Hydrochloric acid and potassium hydroxide
Answer:
what is the question?
Explanation:
A force that is not opposed by an equal and opposite force
Answer:
Balanced Force
Explanation:.
3. What makes water a polar covalent compound?
Answer:
Water is a polar covalent compound since it has Oxygen and Hydrogen which are 2 non-metals and the atoms have an unequal distribution of charge. Oxygen has δ- since it is more electronegative and Hydrogen has δ+. The shape of the water molecule is not symmetrical and dipoles are cancelled out making it a polar covalent compound.
Answer:
it is colourless
Explanation:
its tastleś
Minerals are all naturally occurring solid substances with a definable chemical composition. They must also possess ________. Group of answer choices
Answer:Minerals are all naturally occurring solid substances with a definable chemical composition They must also possess what property
Minerals are all naturally occurring solid substances with a definable chemical composition. They must also possess . Two distinct minerals may have the same chemical formula. The most useful diagnostic property of minerals is their color in hand sample.
Explanation:
The abiotic components of an
ecosystem are
B. the animals and plants.
A. not important.
D. invisible.
C. nonliving.
Answer:
C. nonliving.
Explanation:
Where to start as a beginner in chemistry?
Answer:
Maybe try a Course Outline or talk to a professional for advice.
Explanation:
for the following pairs of elements, identify the element that would be expected to be more electronegative based on periodic tables
Answer:
Chlorine (Cl)
Explanation:
Bromine: 2.96 electronegative
Chlorine: 3.16 electronegative
3.16 > 2.96
Hope this helps!!
2 C4H10+13 O2 = 8 CO2+10 H2O
identify the above chemical reaction type.
how many moles of water are produced when 43 grams of oxygen gas are reacted.
Answer:
This chemical reaction is a combustion.
n = 1.8mol
Explanation:
The ratio of oxygen to water is 13 to 10
The ratio of oxygen to water is also 43 grams to x
Cross multiply: 13x = 430 grams
Isolate x: x = 33.0769g
Remember that n = mass/Molar mass
The molar mass of water is 18.01528 g/mol
n = 33.0769/18.01528
n = 1.836048
HELP PLSSSS!!!!!!!!
Using what you can recall from this unit, write one or two short paragraphs describing Ernest Rutherford's
atomic model. If needed, you may search the Internet for descriptions of the model.
Answer:
Ernest Rutherford's atomic models the basis of our understanding of atoms. The model describes the atom as a tiny and dense with a positively charged core called a nucleus with neutral subatomic particles called neutrons. The model includes negative-charged subatomic particles called electrons that orbit the nucleus.
Ernest Rutherford and his fellow scientist created an experiment in which they bombarded very thin sheets of gold foil with fast moving alpha particles. Alpha particles are a type of radioactive particles that are positively charged. During their time, the current atomic model showed that an atom’s mass and charge are uniformly distributed throughout the atom. Using that model, they expected that the alpha particles would pass through the gold foil with slight deflection or even none at all. While the experiment did show that they were undeflected, they were surprised to see that a small amount bounced of the the foil a large angles.
This experiment led Rutherford to conclude that the particles that were highly deflected must have experienced powerful enough force within the atom to be deflected. He concluded that all of the positive charges and the majority of the mass of the atom must be condensed in a very small space in the atom’s interior, which he called the nucleus. In the nuclear model, the proton and neutrons are in the nucleus, the center of the atom. Electrons a distributed throughout the atom, orbiting the nucleus.
I hope you understand! :)
Ernest Rutherford's model describes the atom as a tiny and dense with a positively charged core called a nucleus with neutral subatomic particles called neutrons. The model includes negative-charged subatomic particles called electrons that orbit the nucleus.
Ernest Rutherford and his fellow scientist created an experiment in which they bombarded very thin sheets of gold foil with fast moving alpha particles. Alpha particles are a type of radioactive particles that are positively charged. During their time, the current atomic model showed that an atom’s mass and charge are uniformly distributed throughout the atom. Using that model, they expected that the alpha particles would pass through the gold foil with slight deflection or even none at all. While the experiment did show that they were undeflected, they were surprised to see that a small amount bounced of the the foil a large angles.
To know more about Rutherford here
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Why does ammonia gas diffuse faster than hydrogen chloride gas?
A) Ammonia has a higher boiling point than hydrogen chloride.
B) Ammonia is a base, hydrogen chloride is an acid.
C) The ammonia molecule contains more atoms than a hydrogen chloride molecule.
D) The relative molecular mass of ammonia is smaller than that of hydrogen chloride.
Ammonia gas will diffuse faster than hydrogen chloride gas because the relative molecular mass of ammonia is smaller than that of hydrogen chloride.
Diffusion rates of gasesAccording to Graham's law, the diffusion rate of gases is inversely proportional to the square root of their molecular weights.
Thus, the lower the molecular weight of a gas, the faster it will diffuse.
The molecular weight of ammonia is 17 while that of hydrogen chloride is 36.5. Thus, ammonia will diffuse faster than hydrogen chloride.
More on Graham's law can be found here; https://brainly.com/question/12415336
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Answer: Maybe Unkown 1. I am not sure.
Explanation:
Which of the following is an example of a ground in a building?
A. A metal rod in the air
B. A pipe to the ground
C. An extra electrical cord
D. A plastic rod
I'll give brainliest to whoever gives the correct answer :D
Answer:
The answer is B
Explanation:
A pipe to the ground
What is the name of Sn3(PO4)4 under the Stock system of nomenclature?
Answer:
Tin (IV) Phosphate
Explanation:
"Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals."
4.
How many grams would .50 moles of Mg be?
5.
10 moles of Al = ? atoms
6.
How many atoms are in 10 moles of Zinc?
7.
If you had 3,5 x 10 - atoms of carbon how many grams would you have?
8.
Given 100g of C = ? atoms
Answerl
see explanation
Explanation:
Question
4.
How many grams would 0 .50 moles of Mg be?
Mg has an atomic weight of 24 so 1 mole of Mg weighs 24 gms
0.50 moles weigh 0.50 X24gm = 12 gm
5.
10 moles of Al = ? atoms
1 mole = 6.02 X10^23 atoms ...Avogadros number
10 moles is 10 X6.02X10^23 = 6.02X10^24
6.
How many atoms are in 10 moles of Zinc?
a mole is Avogadros number
same as 10 moles of Al,10 moles of Zn= 6.02 X10^24 atoms
7.
If you had 3,5 x 10 - atoms of carbon how many grams would you have?
what is the power of the 10-in the question...it was cut off and the question cannot be answered as isif it was 3.5 x10^23 that would be 3.5/6.02 =0,581 moles of C and would weigh0.581X12 = 6.97 gm,
8.
Given 100g of C = ? atoms
Carbon has an atomic of 12 100 gm of C are 100/12 = 8.33 moles of C
each mole comtains Avogadros number so there are
8.33 X 6.02 X10^23 = 5.01 X10^24 atoms of C
How many CO2 molecules are in 1 mole of carbon dioxide?
I think there are 6.02 × 10power23 ( Avogadro's constant)
A sample of an unknown gas occupies 5.51 L at 1.31 atm. What pressure would thisgas exert in a 0.520 L container if the temperature is held constant?
Answer:
13.9atm
Explanation:
Use Boyle's Law: P1V1 = P2V2
Manipulate the equation: P2 = P1V1/V2
Substitute the values: P2 = (1.31atm)(5.51L)/0.520L
P2 = 13.88096atm
Optionally round to 3 sig figs to get 13.9atm
I- A sound is produced at one extremity of a metallic pipe of 1000 m of length. A person being at the other extremity discerns two sounds. (Vsound in the air is 340m/s)
a- Explain this phenomenon.
b- The interval time between the two perceptions is equal to 2.5 s. Calculate the speed of sound in the metal.
The sound was repeated because of the phenomenon of echo. The speed of sound in the metal is 800 m/s.
Echo results from the reflection of sound waves. The reason why a sound may be heard twice owes to the phenomenon of reflection which leads to echo.
To determine the speed of sound in the metal;
Length of metal = 1000 m
Time taken between the two sounds = 2.5 s
Using the formula;
V = 2d/t
V = 2(1000)/2.5
V = 800 m/s
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