Hydrogen bonding occurs when hydrogen is bonded to N, O, or F. Which of the following molecules has hydrogen bonding, when bonding with
their same molecules?
A. CBr4
O B.H2S
C. NO2
OD. NH3

Its Iron and Potassium because if you look at the periodic table,and you go down the list of metals, you can see what metals are there.

Answer:

The correct answer is - mass number.

Explanation:

The atomic number the number of electrons or protons present in a neutral atom.

Atomic number = Number of electrons = Number of protons

Whereas, the mass number the sum of the number of protons and the number of neutrons present in an atom.

Mass number = Number of protons + Number of neutrons

For C-14 and N-14:

C-14 isotope:

Atomic number = number of proton = number of electron = 6.

Mass number = 14

Number of neutrons = 14 - 6 = 8

In N-14 isotope:

Atomic number = number of proton = number of electron = 7

Mass number = 14

Number of neutrons = 14 - 7 = 7

Thus, these two isobars have same mass number.

Answer:

[HBr] = 0.0910 M

Explanation:

NaOH → Strong base

HBr → Strong acid.

This is a titration that involves a strong acid and a strong base, so the recaction is about acid base equilibrium.

Formula for titration in the equivalence point is:

mmoles of acid = mmoles of base

M . Volume of acid = M . volume of base

We replace data:

M . 36.60 mL = 0.150 M . 22.20 mL

M = (0.150 M . 22.20 mL) / 36.60 mL

M = 0.0910 mol/L

Answer:

b

Explanation:

e2020

Answer:B

Explanation:It was correct

Answer

35 torr

Explanation:

The mixture contains 320 torr of hydrogen, 485 torr of oxygen, a total pressure of 840 torr, so you need to find the leftover

320(hydrogen) + 485(oxygen) = 805 torr

840(total) - 805 = 35 torr

Answer:

penicillin could protect mice against infection from deadly Streptococci.

Explanation:

Answer:

In 1940, Florey carried out vital experiments, showing that penicillin could protect mice against infection from deadly Streptococci.

Answer:To calculate the molar mass, first calculate the number of moles of gas using the ideal gas equation. 1 atm. 750 mmHg. (1.00 L). 760 mmHg. 0.0306 mol. L atm.

Explanation:

Answer:

The Lewis dot structure is not correct

Explanation:

Each atom ought to be surrounded by eight electrons or two electrons according to the octet rule. We now need to closely examine the structure to see if it fits into this description.

All the atoms in the molecule have the correct valence except the hydrogen which is directly attached to the oxygen.

The positive charge ought to mean that more than two bonds were formed between hydrogen and oxygen which is clearly not the case here.

Thus, the hydrogen atom attached directly to oxygen does not display the correct valence.

Answer

b b b b b b b b b b b b b b b

Explanation:

Answer:

118 elements have been discovered so far

Explanation:

Answer:

26.98°C

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = Heat transferred to the soil, c = specific heat capacity of dry soil, m = mass of the soil, t₂ = final temperature, t₁ = initial temperature.

From the question,

Given: Q = 11 kJ = 11000 J, m = 2300 g = 2.3 kg, t₁ = 21°C

Constant: c = 800 J/kg.°C

Substitute these values into equation 1

11000 = 800×2.3(t₂-21)

Solving for t₂

t₂-21 = 11000/(800×2.3)

t₂-21 = 11000/1840

t₂-21 = 5.98

t₂ = 5.98+21

t₂ = 26.98°C

Answer:

The forum user pointed out that energy began transferring into the lake as ... How can you use the information from the Sim to respond to the blogger

Explanation:

umm how do you begin answering that ??

Answer:

Raise awareness of the dangers of harmful traditions. ...

Tackle violence against girls in school. ...

Challenge and speak out about violence in the home. ...

Transform attitudes towards harmful practices at multiple levels. ...

Listen to girls' experiences of violence - and their solutions.

Answer:

Potassium carbonate is soluble in water, while calcium carbonate is insoluble. Weigh a sample of the unknown mixture accurately and stir the sample with water. Filter the suspension and find out the mass of the residue collected. It gives the amount of insoluble calcium carbonate present in the mixture.

Explanation:

Answer:

convection within Earth’s interior

Explanation:

Complete question

Name this event

Solution

During the convection within Earth’s interior , the earth's core undergo convection leading to turbulent dynamic that further leads to changing of magnetic field.

Due to movement of core material, there is interaction between the  mantle convection and plate motions.

Answer:

3.00 × 10²³ atoms H

Explanation:

Step 1: Given data

Step 2: Calculate the number of atoms of hydrogen

According to the chemical formula of water, the atom ratio of H to O is 2:1.

1.50 × 10²³ atoms O × 2 atoms H/1 atom O = 3.00 × 10²³ atoms H

Answer:

This is my favorite topic to address. Do you think the Genesis story and Big Bang Theory support one another? Why or why not?

No, the Genesis story and the Big Bang Theory support one another. I'll explain why, God has the power to do the marvelous, the everything that seems impossible to human eyes. Scientist say there was an explosion that originated the universe. That is possible. However, it must have been a controlled explosion.

"Awake 1996 The Awesome Universe  What the Big Bang Explains—What It Doesn’t":

What the Big Bang “Explains”: The most popular version of creation says that about 15 to 20 billion years ago, the universe didn't exist. There was no time, no matter—nothing except an infinitely small point called a singularity, which exploded into the present universe. During the first few minutes of the big bang, nuclear fusion took place on a universal scale. After that it gave rise to the currently "measured concentrations of hydrogen and helium" and part of the lithium in "interstellar space". After around "300,000 years, the universe wide fireball dropped to a little below the temperature of the surface of the sun, allowing electrons to settle into orbits around atoms and releasing a flash of photons, or light."

Questions the Big Bang Does Not Answer: "As the report goes on to note, “other data indicate that certain stars are at least 14 billion years old".

"Still another problem for the big bang has come from evidence of “bubbles” in the universe that are 100 million light-years in size, with galaxies on the outside and voids inside. Margaret Geller, John Huchra, and others at the Harvard-Smithsonian Center for Astrophysics have found what they call a great wall of galaxies some 500 million light-years in length across the northern sky. Another group of astronomers, who became known as the Seven Samurai, have found evidence of a different cosmic conglomeration, which they call the Great Attractor, located near the southern constellations of Hydra and Centaurus. Astronomers Marc Postman and Tod Lauer believe something even bigger must lie beyond the constellation Orion, causing hundreds of galaxies, including ours, to stream in that direction like rafts on a sort of “river in space.”  Also, "Cosmologists say the blast from the big bang was extremely smooth and uniform, according to the background radiation it allegedly left behind. How could such a smooth start have led to such massive and complex structures? “The latest crop of walls and attractors intensifies the mystery of how so much structure could have formed within the 15-billion-year age of the universe,” admits Scientific American—a problem that only gets worse as Freedman and others roll back the estimated age of the cosmos still more."

Do the parallels between the Big Bang/Evolution and the Genesis Creation story strengthen your belief in the idea that God created everything? Why or why not?

Romans 1:20 states: "For his invisible qualities are clearly seen from the world’s creation onward, because they are perceived by the things made, even his eternal power and Godship, so that they are inexcusable." The book "Draw close to Jehovah" further states: "Just think of the blinding flashes and rumbling booms of a thunderstorm, the glorious cascade of a mighty waterfall, the overwhelming vastness of a starry sky! Do you not see the power of God in such displays? Yet, few in today’s world truly recognize God’s power.  Still fewer view it properly. Understanding this divine attribute, though, gives us many reasons for drawing closer to Jehovah."

Based on the book: "Draw Close to Jehovah" it say's: "We do not need to witness a miracle to discern that God possesses this attribute (power). It is readily apparent. The Bible tells us that creation gives proof of Jehovah’s “eternal power and Godship.” Based on the magazine: "Awake 1996 The Awesome Universe  What the Big Bang Explains—What It Doesn’t" states that "EVERY morning is a miracle." And its true! Deep inside the morning sun, hydrogen is being fused into helium at high temperatures that are at million degrees. X rays and gamma rays pour out "of the core into the surrounding layers of the sun." If the sun was transparent, "the rays would blast their way to the surface in a few seconds. Instead, they begin to bounce from tightly packed atom to atom of solar “insulation,” gradually losing energy." Days, weeks, centuries, pass. Thousands of years later, that once deadly radiation finally emerges from the sun’s surface as a gentle shower of yellow light—no longer a menace but just right for bathing earth with its warmth.

Answer:

0.025 liters

Explanation:

divide 25 into 1000

Answer:

25 mL = 0.025 L

Explanation:

edge 2023

Answer:

2.05 x 10²⁴ molecules

Explanation:

The balanced equation for the chemical reaction is the following:

2 HCl + Mg → MgCl₂ + H₂

According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:

moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl

We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:

molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules

Answer:

A

Explanation:

because number of particle = moles × 6.02 × 10^23

which gives the answer as an A

2.41x10²⁴ molecules are in 4 moles of carbon monoxide (CO). Therefore, the correct option is option A.

The smallest recognizable unit into that a pure substance may be divided while retaining its composition as well as chemical properties is a molecule, which is a collection of atoms that are at least two in number. Until parts made up of a single molecule are reached, the division of an example of a substance smaller progressively smaller parts does not result in a change with regard to its composition nor its chemical properties.

Still smaller sections of the substance are produced by further subdivision, and these components are always different chemically and typically have different compositions from the initial substance. The chemical links that link the atoms in the molecule together are severed during this final step of fragmentation.

molecules =  moles × 6.022×10²³

                  = 2.41x10²⁴  

Therefore, the correct option is option A.

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Answer:

"Francium"

Explanation:

"Francium" is a chemical element with the symbol "Fr" and the atomic number "87". Classified as an "alkali metal", Francium is a solid at room temperature.

Atomic Mass: "223.01973u"

Year Discovered: "1939"

Answer:

strong acid

Explanation:

<FIRST ANSWER>  

The answer is A; tundra is at a higher latitude than a desert

Explanation:

Both a tundra and a desert are very dry, so that eliminates B and C.

And as for D, Tundra receives more rain than a desert does, so that eliminates D.

Answer:

The name of the reaction was coined after Alexander William Williamson developed it in 1850.Williamson Ether Synthesis is a reaction that uses deprotonated alcohol and an organohalide to form an ether. 1. Williamson Ether Synthesis usually takes place as an SN2 reaction of a primary alkyl halide with an alkoxide ion.

Explanation:

yeah

Answer:

The development of modern atomic theory revealed much about the inner structure of atoms. It was learned that an atom contains a very small nucleus composed of positively charged protons and uncharged neutrons, surrounded by a much larger volume of space containing negatively charged electrons. The nucleus contains the majority of an atom’s mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom’s volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m—about 100,000 times smaller. For a perspective about their relative sizes, consider this: If the nucleus were the size of a blueberry, the atom would be about the size of a football stadium (Figure 1).

Figure 1. If an atom could be expanded to the size of a football stadium, the nucleus would be the size of a single blueberry. (credit middle: modification of work by “babyknight”/Wikimedia Commons; credit right: modification of work by Paxson Woelber)

Atoms—and the protons, neutrons, and electrons that compose them—are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g, and an electron has a charge of less than 2 × 10−19 C (coulomb). When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu) and the fundamental unit of charge (e). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are assigned masses of exactly 12 amu. (This isotope is known as “carbon-12” as will be discussed later in this module.) Thus, one amu is exactly 112112 of the mass of one carbon-12 atom: 1 amu = 1.6605 × 10−24 g. (The Dalton (Da) and the unified atomic mass unit (u) are alternative units that are equivalent to the amu.) The fundamental unit of charge (also called the elementary charge) equals the magnitude of the charge of an electron (e) with e = 1.602 × 10−19 C.

A proton has a mass of 1.0073 amu and a charge of 1+. A neutron is a slightly heavier particle with a mass 1.0087 amu and a charge of zero; as its name suggests, it is neutral. The electron has a charge of 1− and is a much lighter particle with a mass of about 0.00055 amu (it would take about 1800 electrons to equal the mass of one proton. The properties of these fundamental particles are summarized in Table 3. (An observant student might notice that the sum of an atom’s subatomic particles does not equal the atom’s actual mass: The total mass of six protons, six neutrons, and six electrons is 12.0993 amu, slightly larger than 12.00 amu. This “missing” mass is known as the mass defect, and you will learn about it in the chapter on nuclear chemistry.)

Answer: A & D

Explanation:

The two main forces are temperature and salinity.

An insect needs mud wallows to breed; that insect pollinates several flowers in that ecosystem.

Having mud in an ecosystem is important because Insects are very important as primary or secondary decomposers in the ecosystem. These insects need mud wallows to breed. That insect pollinates several flowers in that ecosystem.

Therefore, the mud in an ecosystem is most important as it provides a place for insects to breed and these insects play a major role in the ecosystem like pollination.

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Answer:

i believe it is titanium.

Explanation:

Answer:

2. Chromium

Explanation: