How does thermal energy transfer when a room is heated by a furnace? a
Hot air is absorbed by the objects in the room; cold air expands and rises.

b
Hot air is circulated through the room; the hot air rises, and cold air falls.

c
Hot air makes direct physical contact with the objects in the room and rises.

d
Hot air is transmitted by electromagnetic waves; the hot air rises and falls.

Answers

Answer 1

Answer:

Answer: D is the right answer pls make me brainliest

Explanation:

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Compared to a 2.0 M aqueous solution of NaCl at 1 atmosphere, a 3.0 M aqueous solution of NaCl at 1 atmosphere has a(1) lower boiling point and a higher freezing point (2) lower boiling point and a lower freezing point (3) higher boiling point and a higher freezing point (4) higher boiling point and a lower freezing point
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Which trends are observed as each of the elements within Group 15 on the Periodic Table is considered in order from top to bottom?(1) Their metallic properties decrease and their atomic radii decrease.
(2) Their metallic properties decrease and their atomic radii increase.
(3) Their metallic properties increase and their atomic radii decrease.
(4) Their metallic properties increase and their atomic radii increase.

Answers

Answer;

-Their metallic properties increase and their atomic radii increase

Explanation;

-Group 15 is also called the nitrogen family. It consists of the elements nitrogen, phosphorus, arsenic, antimony, moscovium and bismuth. The atomic radius of these elements increases from Nitrogen to Bismuth.

-Moving down the group, the ionic radii, and atomic radii increases. This is because of the expansion of another main energy level in each progressive element.

-Moving down a group, metallic character increases. On the other hand, the ionization enthalpy of the elements decreases due to an increase in their nuclear size.

4) their metallic properties increase and their atomic radii increase.

What is the result of multiplying (2.5 × 1010) × (3.5 × 10-7)? Use the correct number of significant digits.

Answers

Answer : The answer will be $8.6* 10^3$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The product of $(2.5* 10^(10))* (3.5* 10^(-7))$

$\Rightarrow 8.6* 10^3$

In the given expression, 2.5 has 2 significant figures and 3.5 has 2 significant figures. From this we conclude that 2 is the least significant figures in this problem. So, the answer should be in 2 significant figures.

Thus, the answer will be $8.6* 10^3$

the result of multiplying (2.5 × 10¹⁰) and (3.5 × 10⁻⁷) is 8.8.10³ (cause the result must have 2 significant number)

Further Explanation

Significant numbers are numbers obtained from the measurement results of exact numbers and the last number estimated

In scientific notation, all numbers are displayed before the big order is called significant numbers

the scientific notation can be described as:

a, ... x 10ⁿ

a, ... called an important number

10ⁿ is called a big order

Rules for significant numbers in general:

1. all non-zero numbers are significant numbers

2. a zero which is located between two non-zero numbers including a significant number

3. all zeros are located in the final row written behind the decimal point include significant number

4. zero decimal point is not significant number

In the question it is known that (2.5 × 10¹⁰) and (3.5 × 10⁻⁷) both have a significant number in a row 2.5 and 3.5

so that it meets the rule of significant numbers which is multiplication of 2 significant number produces numbers that have the fewest significant numbers, So the multiplication of the two will produce 2 significant number

So that we do the significant number then proceed a big order

1. Multiplication of significant number2.5 x 3.5 = 8.75

2. a big order multiplication 10¹⁰ x 10⁻⁷ = 10¹⁰⁻⁷ = 10³

So the result = 8.75.10³

Because the result must have 2 significant number , the result is 8.8.10³ (8.75 we round up)

Learn more

significant figures brainly.com/question/11151926

significant figures in the following number: 5.67 x 106 brainly.com/question/7539478

the number of significant figures is 0.025 brainly.com/question/10343704

0.080 significant figures brainly.com/question/1999241

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Which property is true for metals

Answers

The true property of metals is metals have low ionization energies.

(Option 3).

What are the characteristics of metals?

Metals are characterized by their ability to conduct electricity and heat, malleability, and ductility.

These properties are primarily due to the behavior of their electrons. In a metal, the valence electrons are not tightly held by the individual atoms but rather form a "sea" of delocalized electrons that can move freely throughout the metallic lattice.

One of the key factors that contribute to the delocalization of electrons in metals is their low ionization energies.

Ionization energy is the amount of energy required to remove an electron from an atom, specifically from the outermost shell.

Learn more about Ionization energy here: brainly.com/question/30831422

#SPJ6

The complete question is below:

Which property is true for metals?

1. localized electrons

2. high electronegativity

3. low ionization energies

4. tightly held valence electrons

metals are solid, shiny, and good conductors of electricity and heat
hope this helps :)

Give the formula for the alkane containing 100 hydrogens.

Answers

Answer: The alkane containing 100 hydrogens will be $C_(49)H_(100)$

Explanation:

Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms.These are called as alkanes. The general formula for these hydrocarbons is $C_nH_(2n+2)$

As given number of hydrogen atoms is 100, therefore the value of (2n+2) = 100

2n = 98

n = 49

Thus the formula for the alkane containing 100 hydrogens will be $C_(49)H_(100)$

Final answer:

The alkane containing 100 hydrogens has the formula C49H100.

Explanation:

The formula for the alkane containing 100 hydrogens can be determined using the general formula for alkanes, which is CnH2n+2. To find the value of n, we can set up an equation:

100 = 2n + 2

Simplifying this equation, we get:

n = 49

Therefore, the formula for the alkane containing 100 hydrogens is C49H100.

Learn more about alkane formula here:

brainly.com/question/2919155

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A 182 pound male body was found decomposing in a dense wooded area 1.43 kilometers away from the nearest road. How many meters would a suspect have to drag the body into the woods if the victim was already deceased and transferred to this secondary location from the vehicle

Answers

Answer:

1430 meters

Explanation:

Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows.mc017-1.jpg
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)

Answers

Molar mass :

KClO₃ = 122.55 g/mol
O₂ = 32 g/mol

2 KClO₃ = 2 KCl + 3 O₂

2 x 122.55 g KClO₃ ----------> 3 x 32 g O₂
10.0 g KClO₃ ------------------> ?

Mass of O₂ = ( 10.0 x 3 x 32 ) / ( 2 x 122.55 )

Mass of O₂ = 960 / 245.1

Mass of O₂ = 3.9167 g

number of moles O₂ => 3.9167 / 32 = 0.1223 moles

1 mol -------------- 22.4 L ( at STP)
0.1223 moles ---- ?

V = 0.1223 x 22.4 / 1

V = 2.739 L

hope this helps!

Your answer is 2.74.

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