Screenshot very easy

Answer:

4.5 times 10 = 45

Explanation:

"Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."

Answer:

Both are small

Explanation:

Atom comprises to die molecules, and cell comprise to for tissues

Answer:

Erosion, and soil damage

Explanation:

We do not use the plutonium (Pu) from reprocessed / used nuclear fuel because Plutonium has high rate of spontaneous fission and Uranium is the main fuel which is used for nuclear reactor.

A nuclear reactor is a device which is used to initiate and control a chain reaction to release large amount of steady heat there by produces energy.

Thus from above conclusion we can say that We do not use the plutonium (Pu) from reprocessed / used nuclear fuel because (i) Plutonium has high rate of spontaneous fission and (ii) Uranium is the main fuel which is used for nuclear reactor.

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Answer:

7 mol Fe

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

RxN:     Zn (s) + FeSO₄ (aq) → ZnSO₄ (aq) + Fe (s)

Given:   7 moles Zn

Step 2: Stoichiometry

[tex]7 \ mol \ Zn(\frac{1 \ mol \ Fe}{1 \ mol \ Zn} )[/tex] = 7 mol Fe

Step 3: Check

We are given 1 sig fig.

Since our final answer is in 1 sig fig, there is no need to round.

Answer:

[tex]Speed = 670.56 \frac{m}{min}[/tex]

Explanation:

Given

[tex]Speed = \frac{25 mi}{hr}[/tex]

Required

Convert to meters per minutes

[tex]Speed = \frac{25 mi}{hr}[/tex]

Start by converting the speed from miles to meters

[tex]1\ mile = 1609.34\ meters.[/tex]

So, we have:

[tex]Speed = \frac{25 * 1609.34\ m}{hr}[/tex]

[tex]Speed = \frac{40233.5\ m}{hr}[/tex]

Next, we convert time from hours to minutes

[tex]1\ hour = 60\ minutes[/tex]

So, we have:

[tex]Speed = \frac{40233.5\ m}{60\ min}[/tex]

[tex]Speed = 670.56 \frac{m}{min}[/tex]

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

Answer:

sodium I think .............

Answer:

Rosalind Elsie Franklin (25 July 1920 – 16 April 1958)was a British biophysicist and X-ray crystallographer who made critical contributions to the understanding of the fine molecular structures of DNA, RNA, viruses, coal and graphite. The DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed from parents to children.

rosalindfranklin

Franklin is best known for her work on the X-ray diffraction images of DNA which led to discovery of DNA double helix. Her data, according to Francis Crick, was "the data we actually used" to formulate Crick and Watson's 1953 hypothesis regarding the structure of DNA.Franklin's X-ray diffraction image confirming the helical structure of DNA were shown to Watson without her approval or knowledge. Though this image and her accurate interpretation of the data provided valuable insight into the DNA structure, Franklin's scientific contributions to the discovery of the double helix are often overlooked. Unpublished drafts of her papers (written just as she was arranging to leave King's College London) show that she had independently determined the overall B-form of the DNA helix and the location of the phosphate groups on the outside of the structure. However, her work was published third, in the series of three DNA Nature articles, led by the paper of Watson and Crick which only hinted at her contribution to their hypothesis.

After finishing her portion of the DNA work, Franklin led pioneering work on the tobacco mosaic and polio viruses. She died in 1958 at the age of 37 from complications arising from ovarian cancer.

Answer:

D. P

Hope it works!

Explanation:

Answer: lithium < strontium < magnesium < tellurium < chlorine < oxygen  

Explanation:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

In a period, the ionization energy increases as we move across a period as the size decreases. The electrons get added to the same shell and the nuclear charge increases.The valence shell moves nearer to the nucleus.  Thus more energy is required to remove the valence electron.

In a group , the ionization energy decreases from top to bottom as we move down a group. The size increases as the electrons get added up in the new shell, the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be easier to remove. Thus, lesser energy is required to remove the valence electron.

The correct order of increasing ionization energy will be:

lithium < strontium < magnesium < tellurium < chlorine < oxygen  

Ionization energy is the energy required to remove the most loosely bound electron from the last shell.

In the periodic table, there are groups and periods.

In a period, the ionization energy increases as we move across a period as the size decreases. The electrons get added to the same shell and the nuclear charge increases.

The valence shell moves nearer to the nucleus.  Thus more energy is required to remove the valence electron.

In a group, the ionization energy decreases from top to bottom as we move down a group.

The size increases as the electrons get added up in the new shell, the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be easier to remove. Thus, lesser energy is required to remove the valence electron.

The correct order of increasing ionization energy is:

lithium < strontium < magnesium < tellurium < chlorine < oxygen

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Answer:5) super Volcano eruption

Explanation:

Answer:

#1, #2, #4, and #6 are the answers.

Explanation:

#2, #4, and #6 have something to do with radioactivity which is mostly categorized in nuclear reactions, #3 and #5 are partly categorized in thermal reactions while a chemical plant explosion is almost categorized as a chemical bomb; Chemical explosions may be either decomposition or combination reactions. Decomposition reactions occur in materials such as trinitrotoluene (TNT) and nitroglycerine. Combination reactions require that two or more components react together exothermically to produce hot gases. Some examples are ammonium nitrate and fuel oil (ANFO), and gunpowder (potassium nitrate, carbon, and sulfur). In conclusion, #1, #2, #4 and #6 are the answers.

Answer:

B) 14g of nitrogen

Explanation:

To calculate number of molecules in 9g of water, we first convert mass to mole by using mole = mass/molar mass i.e.

mole = 9g/18g/mol of water

mole = 0.5mol

Next, we multiply by 6.022 × 10^23 molecules to get 3.011 × 10^23 molecules in 9g of water (H2O).

- For hydrogen gas: Molar Mass = 2g/mol, mass = 2g

mole = 2/2 = 1

No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.

- For Nitrogen gas: Molar Mass = 28g/mol, mass = 14g

mole = 14/28 = 0.5mol

No. of molecules = 0.5 × 6.022 × 10^23 = 3.011 × 10^23 molecules.

- For Oxygen gas: Molar Mass = 32g/mol, mass = 32g

mole = 32/32 = 1mol

No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.

- For carbondioxide gas: Molar Mass = 44g/mol, mass = 44g

mole = 44/44 = 1mol

No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.

Based on he results of each calculation, NITROGEN contains the same number of molecules as 9g of water

Answer:

500N/m²

Explanation:

The Pressure can be calculated using the formula:

P = F/A

Where;

F = force (N)

A = Area (m²)

Based on the information provided in the question, F = 30N, A = 0.06m²

P = F/A

P = 30/0.06

P = 500N/m²

Answer:

Explanation:

  3BaBr₂       +       2Na₃PO₄     =       6BaBr + Ba₃(PO₄)₂ (s)

3 x 297 = 891 gm                                          1 x 602 = 602 gm

891 gram of BaBr₂ yields     602 gram of precipitate

15.2 gram of BaBr₂ yields     602 x 15.2 / 891 gram of precipitate

= 10.23 gram

actual yield = 9.5 gram

percent yield = 9.5 x 100 / 10.23

= 92.86 % .

Answer:

1. 4

Explanation:

there are four atoms of hydrogen. you can tell because there is a 4 after the H.

Answer:

um okay lol

Explanation:

Answer:

Oh ok

Explanation:

Also can u pls mark me brainliest im new pls

Answer:

In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.

Answer:

An atom becomes charged when there is an unequal amount of positive and negative particles in the nucleus.

An atom gets a positive charge when there is an increase in protons or a decrease in electrons, such that there are more protons than electrons in the nucleus.

An atom gets a negative charge when there is an increase in electrons or a decrease in protons, such that there are more electrons than protons in the nucleus.

An atom can get a charge with a change of particles in the nucleus if that change results in an uneven number of protons and electrons.

Explanation:

Because protons are positively charged particles and electrons are negatively charged particles, a neutral atom has an equal amount of protons and electrons, so that the opposite charges of the particles cancel each other out.

However, if there is an unequal amount of protons or electrons in the nucleus, the charge of the particles will no longer be canceled out, and the atom as a whole will take on a positive or negative charge.

Answer:

4 valence electrons.

Explanation:

Answer:

anawer is none of the above

Answer:

i think none of the above is the answer

Answer:

E = 3.035× 10-¹⁹J = 1.9eV

f = 4.58 × 10¹⁴Hz

Explanation:

wavelength = 6.55 × 10-⁷m

c = 3 × 10⁸m/s

f = ?

E = ?

a) f = c/wavelength

f = 3 × 10⁸/6.55 × 10-⁷

f = 4.58 × 10¹⁴Hz

b) E = hc/wavelength

E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷

E = 3.035 × 10-¹⁹J

1ev = 1.6 × 10-¹⁹J

Therefore E = 3.035/1.6 = 1.9eV

Answer:

I do believe the answer is false.

Hope This Helps!!

Answer: Lithium fluoride is an inorganic compound with the chemical formula LiF.

Answer:

The chemical formula for lithium fluoride is LiF. I hope this helps

Answer:

Wasim and Nehra did the Proper testing  

Explanation:

In acidic condition Blue litmus turns red

In basic condition Red litmus turns Blue

In order to test an Acidic solution we need Blue litmus.

Wasim Dipped the blue litmus in the solution : it will turn red and shows acid

Akram  Dipped the red litmus in the solution : No it will not show, it's a test for base

Neha: Dipped both the blue and the red litmus in the solution one after other.

          Blue litmus will turn red which will show Acidic nature, after that Adding Red litmus in it will not show any change as Red litmus only changes in Basic condition.

Therefore,  Wasim and Nehra did the Proper  testing  

Answer:

D

Explanation:

Answer:mark as brainliest

Explanation:H2SO4 and anhydrous calcium chloride CaCl2 are not used to dry ammonia because they react with it. The gas is passed through fresh quicklime (solid calcium oxide lumps) to effectively dry it.

Answer:

a

Explanation:

A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map. The maritime polar has formed immediately north of Antarctica in the image.

The north Pacific Ocean produces the majority of the maritime polar air masses that affect the United States. However, maritime polar air occasionally forms in the North Atlantic Ocean and moves into the New England states.

In the winter, for example, an arctic air mass can move over the ocean, picking up some warmth and moisture from the warmer ocean and transforming into a maritime polar air mass (mP), which is still fairly cold but contains moisture.

In the image, the maritime polar has formed immediately north of Antarctica. The temperature of mP air varies between just above freezing and below 70 degrees Fahrenheit. As it moves over elevated terrain, mP air changes. Mountain ranges on the windward side

Thus, The maritime polar has formed immediately north of Antarctica in the image.

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{45.3}{60} \\ = 0.755[/tex]

We have the final answer as

Hope this helps you

Explanation:

The atomic mass of elements on the periodic table are derived from the proportion of the geonormal abundance of the different isotopes of an element.