12. A satellite in space experiences direct sunlight and heats up. During periods when it receives no direct sunlight, (1 point)
the satellite cools off by radiation.
the satellite cools off by conduction.**
the satellite maintains a constant temperature.
the satellite cools off by convection.
13. Use the image below to answer the following question.

A photo shows a pair of sandals and a sunglass case on a beach.
A beachgoer leaves a pair of sandals on the shore while she swims. When she puts the sandals on again, the bottom of her feet will feel hot because _____. Choose all that apply.

(2 points)
the sandals were warmed by radiation**
heat will transfer to her feet by radiation
heat will transfer away from her feet by conduction
heat will transfer to her feet by conduction
14. Four positively charged particles are at various distances from a positively charged plate. The particles are equally charged and do not influence each other. Which particle has the greatest potential energy?

The bottom of a rectangular area shows a row of positive signs that represent the positively charged plate. Four starburst icons labeled A, B, C, and D represent the positively charged particles. A is closest to the plate; B is farther away than A; C is farther away than B; and D is farther away than C.In row 1, column 1 is labeled upper A, column 2 is labeled upper B,
column 3 is labeled upper C, and column 4 is labeled upper D. In row 2, there is a symbol representing a positively charged ion near the bottom of column 1. The symbol is shaded a different color than the background. In row 2, column 2, the ion symbol is a little higher than it was in column 1. In row 2, column 3, the ion symbol is a little higher than it was in column 2. In row 2, column 4, the ion symbol is near the top of the column. In row 3, all of the columns are merged together. The row is shaded the same color as the ion symbols in row 2, and there are 9 positive signs, spaced evenly across the row. (1 point)
A
B
C**
D
15. Use the image below to answer the following question.
A man prepares to use a bow and arrow by pulling the arrow back against the string of the bow.
Which of the following energy changes occurs as a bow is drawn and released?

(1 point)
gravitational potential to chemical potential**
magnetic potential to kinetic
elastic potential to kinetic
kinetic to thermal
16. Jerri is planning to rebuild the engine of an antique car. She has chosen all the materials she needs, including a high-quality synthetic oil to reduce friction in the engine. What effect will reducing friction have on the engine’s performance? Choose all that apply. (2 points)
Reduced friction means reduced efficiency.
Reduced friction means reduced heat transfer.
Reduced friction means increased efficiency.
Reduced friction means increased heat transfer. **
17. During a space shuttle landing, a parachute deploys from the back of the shuttle as it taxis down the runway. In addition to the speed brake, the parachute helps the shuttle come to a complete stop. How does the parachute help during this process? (1 point)
It increases the weight of the shuttle.
It increases the potential energy of the shuttle.
It increases friction by air resistance.**
It increases heat transfer by radiation.

Answer : The chemical formula for aluminum fluoride is [tex]AlF_3[/tex]

Explanation :

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

Ionic compound are usually formed when a metal reacts with a non-metal.

The nomenclature of ionic compounds is given by:

1. Positive ion is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

3. In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.

The given compound is, aluminum fluoride.

Aluminum fluoride is an ionic compound because aluminum element is a metal and fluorine element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The charge on aluminum is (+3) and the the charge on fluorine is (-1). Both combine with the an ionic bond by the criss-cross method. Thus, the formula of the compound potassium chloride will be [tex]AlF_3[/tex]

Hence, the chemical formula for aluminum fluoride is [tex]AlF_3[/tex]

The chemical formula for aluminium fluoride is AlF₃. Therefore, option C is correct.

A chemical formula is a notation that represents the composition of a chemical compound. It uses chemical symbols and subscripts to indicate the types and number of atoms present in the compound.

In the chemical formula, the chemical symbols of the elements are used to represent the different types of atoms. Subscripts are used to indicate the number of atoms of each element in the compound. They are written as small numbers to the right of the chemical symbol.

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Answer is: A.) R represents chemical energy, P represents thermal energy.

A natural gas stove transforms R energy into P energy.

For example methane is natural gas.

Balanced chemical reaction of methane combustion:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) ΔH = -802.3 kJ.

This is exothermic reaction, energy is released in form of heat.

The law of conservation of energy states that the total energy of an isolated system remains constant; energy can neither be created nor destroyed; it can only be transformed or transferred from one form to another.

The mass of 2.80 grams of h2o is 18.02 amu I believe

Answer:

D

Explanation:

electromagnet STUDY ISLAND :)

Electromagnetic waves best describes the signals sent and received by satellites. Therefore, the correct option is option D.

In classical physics, electromagnetic radiation refers to the movement of energy through a material medium or across empty space at the speed of light in the form of the magnetic and electrical fields that comprise up electromagnetic waves like electromagnetic radiation, visible light, including gamma rays.

Time-varying magnetic and electric fields are linked to one another at right angles or perpendicular towards the direction that of motion in such a wave. The strength and wavelength v of the time fluctuation of the magnetic and electricity fields define an electromagnetic wave. Electromagnetic waves best describes the signals sent and received by satellites.

Therefore, the correct option is option D.

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Polar Covalent is the name used to describe bonds that have both ionic and covalent character because the electrons are shared unequally. The Pauling Scale is used to assign electronegativity to atoms. It ranges from to 4.00 (fluorine).

Final answer:

The electronegativity difference between two atoms in a bond determines the ionic or covalent character of the bond. A greater difference in electronegativity indicates a more polarized electron distribution and larger partial charges of the atoms. Small or zero electronegativity differences indicate nonpolar covalent bonds.

Explanation:

The electronegativity in the determination of the ionic or covalent character of a bond is calculated by finding the difference in electronegativity between the two atoms in the bond. Electronegativity is a measure of the tendency of an atom to attract electrons towards itself in a chemical bond. The greater the difference in electronegativity, the more polarized the electron distribution and the larger the partial charges of the atoms. If the electronegativity difference is very small or zero, the bond is covalent and nonpolar. When the difference is large, the bond is polar covalent or ionic.

I think it would either be (A) or (B)

It would slow down or stay constant - but it wouldn't speed up.

I think the answer is C. because I got this question wrong when I picked answer choice B. And it would be impossible for the ball to speed up.

Reactions spontaneous at high temperatures are endothermic with both positive enthalpy and entropy changes, and positive enthalpy change implies an endothermic reaction. In 3A + B yields 2AB, for every two AB produced, three A are required. On a potential energy diagram, activation energy and enthalpy change are found by comparing potential energy of different stages.

If a reaction is only spontaneous at high temperatures, then it must be endothermic, with both positive enthalpy and entropy changes. When a reaction has a positive enthalpy change, this means it's endothermic and heat is added to the system. In response to part 3 of your question, for the reaction 3A + B yields 2AB, it's accurate to say that for every two AB produced, the reaction requires three A.

Now, regarding how to use a potential energy diagram to find out about required activation energy and enthalpy change of a reaction: The activation energy is represented by the difference in potential energy from the reactants to the top-most point (peak) of the diagram.

The enthalpy change of the reaction, on the other hand, is determined by the difference in potential energy between the reactants and the products. If the products have less potential energy than the reactants, the reaction is exothermic; if they have more, the reaction is endothermic.

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Shrimp burrow which is one of the examples of trace fossils.

Answer:

Option (1)

Explanation:

Trace fossils are defined as those traces such as the impressions and signs of ancient remains of an organism, that are found over relatively softer sediment.  

These play a very important role in the field of paleontology as it provides information about the ancient organism that lived in the past in a particular location.

Some of the examples of trace fossils are track and trails, burrows, footprints, cast and mold.

Shrimp burrows are an example of trace fossils, which are made by the marine organisms named shrimps, that are usually found at the bottom of the ocean.

Thus, the correct answer is option (1).

According to the Law of Conservation of Mass,

The mass of the products in a chemical reaction must equal the mass of the reactants.

∴ D is the Answer

Answer:

D) the mass of the reactants always equals the mass of the products

Explanation:

I got this right during a test :)

[tex]W_{I}= F_{I}[/tex]×[tex]D_{I}[/tex]

where [tex]W_{I}[/tex] is the work input

[tex]F_{I}[/tex] is effort force or force input

[tex]D_{I}[/tex] is the input distance

1) Aufbau principle is a scheme used to reproduce the electron configurations  of the ground states of atoms by successively filling subshells with electrons in a specific  order, filling subshells in the following order: 1s, 2s,  2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

First exceptions to the Aufbau principle is for example chromium atom (Cr).

Chromium has atomic number 24, it means it has 24 protons and 24 electrons.

The Aufbau principle predicts the configuration  [Ar] 3d⁴ 4s².

But the correct electron configuration of chromim atom is:

₂₄Cr 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹ or   [Ar] 3d⁵ 4s¹.

In chromium, half full d-sub level (3d) is more stable than a partially filled d sub-level (3d⁴), that is why an electron from the 4s orbital goes to a 3d orbital.

2) Second example is gallium atom (Ga).

Gallium has atomic number 31, it has 31 protons and 31 electrons.

The Aufbau principle predicts the configuration:

₃₁Ga 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹.

The correct electron configuration for gallium atom is:

₃₁Ga 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹.

That is because 3d subshell has lower energy, when is filled with electrons, than 4s subshell.

Valence electrons are in 4s and 4p orbitals, because when gallium loses three electrons, it has electron configuration:

₃₁Ga³⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰.

H2O2 i think this is it

H2O2 i believe is the answer sorry if im wrong

Correct answer is: A

Answer: The correct answer is Option A.

Explanation:

We are given some ions, which are:  [tex]Na^+,PO_4^{3-},V^{3+}\text{ and }Cl^-[/tex]

The compounds which may be formed from these ions will be [tex]Na_3PO_4,NaCl,VPO_4\text{ and }VCl_3[/tex]

Precipitates are defined as the substances which are not soluble in water at any temperatures. They remain undissolved in water.

Out of the formed salts, the soluble ones are [tex]Na_3PO_4,NaCl\text{ and }VCl_3[/tex]

[tex]VPO_4[/tex] remains insoluble in water and thus, the correct answer is Option A.

In this case there are 3 significant figures.

Any zeroes after another number, (i.e. 9300.000), you consider these numbers.  

If there is something like 0.0060, this would be two significant digits.  

Zeroes before a number are not significant, anything after are.  

Hope this helps any confusion!

Please mark me brainliest!

Answer:

3 significant figures

Explanation:

The rules for deciding which digits in a measurement are significant are as follows:

1) All nonzero digits are significant.

2) Sandwiched (or embedded) zeros, those between significant digits, are significant.

3) Leading zeros, which are zeros at the beginning of a decimal number less than 1, are not significant.

4) Trailing zeros, which are zeros at the end of a number, are significant only if the number has a decimal point.

By rule 4 since 60.0 has a decimal point all 3 figures are significant

Answer: The given element is non-metal and the number of valence electrons are 7

Explanation:

There are 2 types of elements in the periodic table:

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

We are given:

Fluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]

This element will gain 1 electron to form [tex]F^-[/tex] ion

Number of valence electron in fluorine element = 2 + 5 = 7

Hence, the given element is non-metal and the number of valence electrons are 7

It's internal energy or heat energy.

C. Rapping, is your answer.

Mass is calculated by using an objects inertia. Since inertia is a quality of matter that resists motion, we can apply an increasing force to an object until it accelerates.

Then, by measuring its acceleration we can now determine its mass using the simple equation F=m×a, except rewritten as m=Fa.

So we divide the force that we applied by the acceleration rate and we get the objects mass.

Without inertia this cannot be done.

∴ Answer is C

The true statement among the options is C, stating that the mass of an object can be measured by its inertia. This highlights the direct relationship between an object's mass and its inertia, distinguishing mass from weight, which is gravity-dependent.

The question asks to choose the TRUE statement from the given options regarding mass, weight, and inertia. The correct answer is C. The mass of an object can be measured by its inertia. This statement is true because mass is a measure of the amount of matter in an object and determines its inertia - i.e., its resistance to changes in motion. Newton's first law, often called the law of inertia, illustrates that objects with more mass (more "stuff") have more inertia. Hence, an object's mass, an intrinsic property that does not change with location, can indeed be measured by its inertia. Weight, however, is the force of gravity acting on an object and can vary based on the object's location in a gravitational field.

Hi,

An isosceles triangle is a triangle containing two sides of same length & one side of larger length.

Suppose we have a  isosceles triangle ABC as depicted in the figure attached.

Here we see that side AB is equal to the side BC

The angle at point  A is same as the angle at point C that is almost 45 degrees, Moreover, triangle BDC and ABD are also isosceles.

                       If: BD=AD=x , then , BD=DC=x

We can see in the figure that AC is equal to AD+ DC

Which means,                  AC= x+ x= 2x

Now we need to find out the length of AB, here we will use Pythagorean Theorem.

                                    AC^2 = AB^2 + BC^2

Since BC= AB, so we can write it as:

                                    AC^2 = 2AB^2

Taking sq. root on both sides

                                        AC= 2AB

                                        AB= AC/√2

Putting the value of AC as 2x

                                        AB=  2x/√2

Which means                 AB= x√2

Therefore,the length of one leg of the large right triangle in terms of x will be x√2

Hope it helps!

Answer:

X square root 2

Explanation:

Hello hello hello! I am taking this quiz right now and will take it down if it is wrong and correct it, but I think it is right!

Answer :

In general trend,

The size of the element increases as we go down in a same group.

And the electronegativity of the element decreases as we go down in a same group.

For example : The two elements Magnesium and Calcium in a same group number 2.

The size of calcium is greater than the magnesium because as we go down in a group the atomic radius increases and the size also increases. And the electronegativity of calcium is less than the magnesium because as we go down in a group the electronegativity decreases.

D. circuit breaker

Hope This Helped

In case of heteroatomic molecules there is possibility of difference in electro negativity of the two hetero atoms bonded, this results in development of charges on the two atoms

more electronegative element will have a negative charge

less electronegative element will have a positive charge

Case

a) if the difference is less than 0.4 the molecule is  nonpolar.

b) if the difference is from 0.4 to 1.7 the molecule is  polar covalent.

c) if the difference is more than than 1.7 the molecule ionic (polar).

Answer : the statement that is true about the atom is It is present in the second group of the periodic table.

Explanation :

The Lewis dot model shows the number of valence electrons present in the atom.

Since the given metal has 2 dots, it indicates that the metal atom must have 2 electrons in its outermost shell.

Therefore option 2 : It has two electrons in the innermost energy level, is wrong because it contains 2 electrons in the outermost energy level

Option 1 : It is most likely to form covalent bonds is also wrong because a metal atom always forms ionic bond

Option 3 : It requires six other atoms to form a stable compound, is also wrong as the metal can form a stable compound by donating its 2 electrons to a non metal.

On periodic table, representative elements are arranged in groups based on their valence electrons. Therefore by knowing the outermost electrons, we can predict the group in which the element can be categorized.

Since the given metal atom contains 2 electrons, it must be present is second group.

Therefore the statement that is true about the atom is It is present in the second group of the periodic table.

Answer is: qcalorimeter is 8635.9273 J.

ΔT= 22.35°C - 18.94°C.

ΔT = 3.41°C = 3.41 K; temperature change.  

m(H₂O) = 600.0 g; mass of water.  

mr = 605.0; mass of solution.

cp= 4.186 J/g·K, specific heat capacity of the solution.  

qcal = mr · ΔT· cp.  

qcal = 605 g · 3.41 K · 4.186 J/g·K.  

qcal = 8635.9273 J; amount of heat absorbed.

Amount of heat absorbed of calorimeter when 5g of NaHCO₃ is added to 600g of water in a ‘coffee cup calorimeter' is 700,396.4968 J.

Amount of absorbed heat will be calculated as:
Q = mcΔT, where

ΔT = change in temperature = 22.35°C - 18.94°C = 3.41°C = 276.56 K

m = mass of solution = (5g + 600g) = 605g

c = specific heat of calorimeter = 4.186 J/g.K

On putting these values on the above equation, we get

Q = (605)(4.186)(276.56)

Q = 700,396.4968 J

Hence heat of calorimeter is 700,396.4968 J.

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1. c. ionic___ NaCl .  

2. a.covalent___CO2

3. b.metallic ___ZnCu

Answer : The change in internal energy is, 900 Joules.

Solution : Given,

Heat given to the system = +1400 J

Work done by the system = -500 J

Change in internal energy is equal to the sum of heat energy and work done.

Formula used :

[tex]\Delta U=q+w[/tex]

where,

[tex]\Delta U[/tex] = change in internal energy

q = heat energy

w = work done

As per question, heat is added to the system that means, q is positive and work done by the system that means, w is negative.

Now put all the given values in the above formula, we get

[tex]\Delta U=(+1400J)+(-500J)=900J[/tex]

Therefore, the change in internal energy is 900 J.

The change in internal energy depends on the heat energy and work done. As we will change in the heat energy and work done, then changes  will occur in the internal energy. Hence, the energy is conserved.

Answer:

55.0 g/mol

Step-by-step explanation:

Step 1. Partial pressure of hydrogen

You are collecting the gas over water, so

[tex]p_{\text{atm}} = p_{\text{H}_{2}} + p_{\text{H}_{2}\text{O}}[/tex]

[tex]p_{\text{H}_{2}} = p_{\text{atm}} - p_{\text{H}_{2}\text{O}}[/tex]

[tex]p_{\text{atm}} = \text{756.0 Torr}[/tex]

At 25 °C,[tex]p_{\text{H}_{2}\text{O}} = \text{23.8 Torr}[/tex]

[tex]p_{\text{H}_{2}} = \text{756.0 Torr} - \text{23.8 Torr} = \text{732.2 Torr}[/tex]

===============

Step 2. Moles of H₂

We can use the Ideal Gas Law.

pV = nRT                                       Divide both sides by RT

n = (pV)/(RT)

p = 732.2 Torr                               Convert to atmospheres

p = 732.2/760  

p = 0.9634 atm

V = 291 mL                                     Convert to litres

V = 0.291 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 25 °C                                        Convert to kelvins

T = (25 + 273.15 ) K = 298.15 K    

n = (0.9632 × 0.291)/(0.082 06 × 298.15)      

n = 0.2804/24.47

n = 0.011 46 mol

===============

Step 3. Moles of metal

The partial chemical equation is

M + H₂SO₄ ⟶ H₂ + …

The molar ratio of M:H₂ is 1 mol M:1 mol H₂.

Moles of M = 0.011 46× 1/1

Moles of M = 0.011 46 mol M

===============

Step 4. Atomic mass of M

Atomic mass = mass of M/moles of M

Atomic mass = 0.630/0.011 46

Atomic mass = 55.0 g/mol

The nuclear charge of lithium-6 and lithium-7 is +3 for both isotopes. This is because both isotopes have 3 protons. The difference in isotopes lies only in the number of neutrons.

To understand the nuclear charge of lithium isotopes, it is essential to know that the nuclear charge (Z) is determined by the number of protons in an atom. Lithium, regardless of its isotope, always has 3 protons. Therefore, the nuclear charge of lithium-6 is +3 and the nuclear charge of lithium-7 is also +3.

Here's a brief description of both isotopes:

Regardless of the difference in their neutrons, the nuclear charge remains the same for both isotopes because the nuclear charge depends solely on the number of protons present.

The isotope is phosphorus-32.  

It possesses 15 protons that make it phosphorus, 15 electrons, thus, the charges get balanced, and it is electrically neutral. It has 17 neutrons, so in combination, it has 32 protons/neutrons in the nucleus. Therefore, the name is phosphorus-32.  

The phosphorus-32 is a beta-emitter with a half-life of 14.3 days that is, used regularly in life-science projects, mainly to generate radiolabeled RNA and DNA probes, like for application in Southern Blots and Northern Blots.  

Answer:

32P

Explanation: