Answer: iron
Explanation: Metals' atoms are closely bonded in a crystal lattice. In metallic bonds, the electron cloud boundaries of atoms touch each other. Many nonmetals occur as diatomic molecules. The electron clouds of these two bonded nonmetal atoms overlap .
Hydrogen atoms are most likely to touch each other without overlapping because of their small size and simple atomic structure.
A hydrogen molecule is a particle of the synthetic component hydrogen. The electrically unbiased molecule contains a solitary emphatically charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
Hydrogen exist as diatomic particle, I.e., it can exist by attaching to another hydrogen. You realize that hydrogen has just a single electron in it's furthest and just shell. Yet, to accomplish a steady design, there should be two electrons in this shell. So two hydrogen molecules share their electrons by holding.
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An exothermic reaction
In an endothermic reaction, the energy of the products is
the energy of the reactants.
Activation energy is
the potential energy of the products.
Answer:
An exothermic reaction
✔ produces energy
.
In an endothermic reaction, the energy of the products is
✔ more than
the energy of the reactants.
Activation energy is
✔ always greater than
the potential energy of the products
Answer:
Produces energy
More than
Always greater than
Explanation:
Which of the below is not a characteristic of a liquid?
Has a definite volume
Particles are spread far apart
Particles move at a medium speed
Takes the shape of its container
where do the sun rays hit Earth's surface nearly at right angles
Answer:
The Sun Ray's hit earths surface at Earths Equator
How many protons, neutrons, and electrons does potassium-38 have?
Answer:
19 protons, 20 neutrons and 18 electrons.
Explanation:
Can someone please help with this !!!!
In terms of percentages, what are the 3 biggest uses of natural gases?
1) Using Gas In The Home. In our homes, we end up utilizing the material every day.
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
Hope this helps. Btw, I love ur pfp!
Answer:
1) Using Gas In The Home. In our homes, we end up utilizing the material every day. ...
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
explain what is ment by solvent front
Answer:
In paper chromatography, the wet moving edge of the solvent that progresses along the surface where the separation of the mixture is occurring.
Explanation:
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Q1. Consider respiration, one of the most common chemical reactions on earth occur according
to the reaction:
C6H1206 +602 = 6CO2 + 6H2O + energy
What mass of CO2 forms in the reaction of 25g of glucose with 40g of oxygen?
Answer: First we need to know how many moles of each reactant there are.
C6H12O6 : 25g/180.06g/mol=0.1388mol
O2: 40g/32g/mol=1.25mol
The equation tells us we need 6 moles of O2 for every 1 mole of Glucose.
6 x 0.1388 = 0.8328
So, we have more O2 then needed – it is in excess.
Glucose is the limiting reagent – we use this for the calculation.
The equation tells us we make 6 moles of CO2 for every 1 mole of Glucose
So, we make 0,8328 moles of Carbon Dioxide
Explanation:
In a simple food chain, a frog eats insects and a snake eats the frog. The primary role of the frog in the food chain is?
Answer:
It is clear from the above food chain that the grass occupies the first topic level which consists of producers. The second tropic level consist of primary consumers which is Insect. And the Frog assign the Third tropic level of food chain consisting of secondary consumers.Explanation:
Which location in the diagram above is the Northern Hemisphere experiencing winter?
Location A
Location B
Location C
Location D
Answer:
location b
Explanation:
Answer:
Location D
Explanation:
is true answer
difference between vegetative and reproductive part
Answer:
The vegetative parts includes the roots, stems,leaves and the reproductive parts include flowers. ... The vegetative parts can reproduce new plants by the process of vegetative propagation but the reproductive parts cannot produce new plants directly instead they produce precursor of new plants that are seeds or fruits.
Given a 0.5 M stock solution of aqueous NaCl, how much of the stock solution would you need to make a 50 mL sample of 0.25 M aqueous NaCl solution? How much water would you need to add to the NaCl solution?
Answer:
25 ml of stock
Explanation:
Molarity x Volume of Concentrated Stock = Molarity x Volume of Diluted Stock
=> Mc x Vc = Md x Vd => (0.5M)(x) = (0.25M)(50 ml)
=> x = Vc = (0.25M x 50 ml) / (0.50M) = 25 ml of stock
A 5.0L balloon in a freezer is at a temperature of - 50 degrees * C has a pressure of 800 mm Hg. What will be the new pressure if the balloon is taken out and placed in a warm room (Temperature 37°C) and the volume expands to 7.0 L?
Answer:
794 mmHg
Explanation:
We are going to be using the Combined Gas Law for this problem as well. Just to refresh out memory - the Combined Gas Law expresses the relationship between pressure, volume, and temperature (in KELVIN) of a fixed amount of gas. The equation itself? Right here: [tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Now, looking at the problem, let's assign the values to its corresponding variable:
P1 = 800mmHg; V1 = 5.0L; T1 = -50°C + 273 = 223K
V2 = 7.0L; T2 = 37°C + 273 = 310K; P2 = ?
We are looking to find the new pressure, a.k.a. P2. So, let's plug and chug the values into the equation.
Set up: [tex]\frac{(800 mmHg)(5.0L)}{223K} = \frac{(7.0L)(P_{2})}{310K}[/tex]
==> [tex]\frac{(800 mmHg)(5.0L)}{223K} * 310K = (7.0L)(P_{2})}[/tex]
==> [tex]P_{2} = \frac{(800 mmHg)(5.0L)}{223K} * \frac{310K}{7.0} }[/tex]
==> [tex]P_{2} =[/tex] 794.36 = 794 mmHg
What is the cation in KF?
Answer:
K, or Potassium
Explanation:
The oxidation state for Cl is A. -1 as a reactant and +1 as a product B. -1 as a reactant and 0 as a product C. -1 as a reactant and -1 as a product D. +1 as a reactant and +1 as a product
Answer:
no sure
Explanation:
O
The ester functional group is symbolized as ||
R-C-R
True False
Answer:
False
The ester functional group is not symbolized as R-C-R
Explanation:
The general formula of ester functional group is RCOOR′ where R represents a hydrogen atom or aryl group or an alkyl group while R' represents the alkyl group or an aryl group
Hence, the given statement is false
Why do you think it would be important for scientists to test local water?
Answer:
It would be important because they will know if the water is infected by some type of disease or harmful bacteria
Explanation:
g Consider (12.5 A) micro-grams of a radioactive isotope with a mass number of (78 B) and a half-life of (32.6 C) million years. If energy released in each decay is 32.6 keV, determine the total energy released in joules (J) in 1 (one) year. Give your answer with three significant figures.
Answer:
Energy released = 18.985 J
Explanation:
The exponential decay of radioactive substance is given by -
N(t) = N₀ [tex]e^{-kt}[/tex]
where
N₀ = initial quantity
k = decay constant
Half life, [tex]t_{1/2} = \frac{ln 2}{k}[/tex]
⇒[tex]k = \frac{ln 2}{t_{1/2} }[/tex]
Given,
N₀ = 12.5 + 3 = 15.5 × 10⁻⁶ gm
[tex]t_{1/2}[/tex] = 32.6 + 18 = 50.6 × 10⁶ years
So,
[tex]k = \frac{ln 2}{50.6 * 10^{6} }[/tex] = 1.361 × 10⁻⁸ year⁻¹
Now,
N(1) = 15.5 × 10⁻⁶ [tex]e^{-1.361*10^{-8} *1}[/tex]
= 15.49999978904
Now,
Substance decayed = N₀ - N(t)
= 15.5 × 10⁻⁶ - 15.49999978904 × 10⁻⁶
= 21.095 × 10⁻¹⁷ kg
⇒Δm = 21.095 × 10⁻¹⁷ kg
So,
Energy released = Δmc²
= 21.095 × 10⁻¹⁷ × 3 ×10⁸ × 3 × 10⁸
= 189.855 ×10⁻¹
= 18.985 J
⇒Energy released = 18.985 J
Another name for a single-celled organism is
A. uni-cellular
B. one cellular
C. multi-cellular
D. eukaryotic
Answer:
A. Uni-cellular
120 g of KI at 0 °C solution is
Answer:
i dont care to you
Explanation:
cause you are tuyo
solution is 9°5
Which statement describes a physical property of copper?
Answer:
Copper is typically a solid and has a coppery, bronzy color. It is a metal and has a relatively high melting point. It has a strong luster and can conduct electricity.
Answer:
RESHAPE BY A FORCE.
Explanation:
1. It can be reshaped by a force. Physical property can be observed and measured without any changes in molecular composition.
2. A physical property is one that can be change without altering the identity of the substance. These set of properties is not concentration dependent they are use to describe matter. Example are: density, solubility, melting point and color and odor. For this case the second option seems to fit the description it can be reshape by force.
Which of the following descriptions is correct?
А. a mixture consists of two or more pure substances which can only be separated by chemical methods
B. a colloid is a 'cloudy' mixture containing particles which will not easily settle out when the colloid is left standing
C. a solution consists of a solvent dissolved in a solute
D. a suspension contains particles which will not settle out if the suspension is left standing
A 10.35 kg block of ice has a temperature of −22.3 °C. The block absorbs 4.696 x 10^6 J of heat. What is the final temperature of the liquid water?
Answer:
: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question
Explanation:
can someone help me???
Answer:
Waning Crescent
Explanation:
Hope iT Help
Brainliest please
help MEEEEE!!!!!!!!!!!
Answer:
Equation
Mark as brainlist
Answer:
equation
Explanation:
chemical changes can be shown in an equation/reaction because you can see products and reactants.
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A ball of ice, rock, dust, and gas that orbits the Sun is called a(n) comet. asteroid. meteor. meteorite.
Answer: comet
Explanation: :)
Arctic foxes grow new fur with different seasons. They grow brown fur in the summer and white fur in the winter. These changes are examples of which survival characteristic?
adaptation
hibernation
metamorphosis
migration
Answer:
Adaptation.
Explanation:
The survival characteristic adopted by Arctic foxes during different seasons is called adaptation.
The term adaptation is used to define any behavioral or physical characteristics adopted by animals to help them survive their environment. The survival characteristics in the animal can be categorized into three domains: body parts, body coverings, and behaviors. In Arctic foxes, we see body coverings survival characteristics.
Therefore, option A is correct.
What transition energy corresponds to an absorption line at 502 nm?
A. 4.56 x 10-19
B. 1.76 10-19
C. 2.53 x 10-19
D. 3.96 10-19 J
Answer:
D 3.96 10-19J
Explanation:
I took the test
Today, there are ____ GMO crops currently produced in the US.
A. 120
B. 10
C. 55
D. 1000
Answer: I think that is 55
Explanation: I hope I help
true or false atoms can be made up of just one type of atom
Answer:
false
Explanation:
A compound has the combined properties of the elements from which it is made. Atoms show the macro properties of an element.