Which is true about models in science?A-Models are accurate enough for the phenomena they represent.
B-Models only present macroscopic versions of the submicroscopic.
C-Models help explain phenomena but are not good for predicting events.
D-Models are used throughout science although they are not always accurate.

Answers

Answer 1

Answer: D-Models are used throughout science although they are not always accurate.

Answer 2

Answer: I think c is the answer but I could be wrong..

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1. The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?A) Gold has a higher activity than hydrogen and cannot replace it. B) Gold has a lower activity than hydrogen and cannot replace it. C) The reaction cannot occur because water is a reactant. D) The reaction proceeds too slowly to create products. 2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O? answer choices are attached A,B,C,D top to bottom 3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation? A) one B) two C) four D) six 4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that? A) combustion B) redox C) synthesis D) decomposition 5. If ions change places and a gas is formed, then what type of reaction is indicated? A) double-displacement B) synthesis C) decomposition D) single-displacement

The metric unit of force is the

A. newton
B. pound
C. kilogram
D. watt

Answers

Answer:

Newton

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In a nuclear reaction, the energy released is equal to 8.1 x 1016 joules. Calculate the mass lost in this reaction. (1 J = 1 kg m2/s2) and the speed of light = 3.00 × 10^8 m/s ]Answer

7.2 x 1032 kg

2.7 x 108 kg

9.0 x 10-1 kg

7.2 x 10-16 kg

Answers

use the formula E=mc^2
energy given=8.1 x 10^16 joules
speed of light = 3.00 × 10^8 m/s

plug in the values we'll get mass=9.0 x 10-1 kg

Answer : The mass lost in this reaction will be, $9.0* 10^(-1)Kg$

Explanation :

According to the Einstein equation, the energy is equal to the product of mass and the square of the speed of light.

The mathematical expression is :

$E=m* c^2$

where,

E = energy released = $8.1* 10^(16)J$

c = speed of light = $3* 10^8m/s$

m = mass lost = ?

Now put all the given values in the above formula, we get the mass lost in the reaction.

$8.1* 10^(16)J=m* (3* 10^8m/s)^2$

$8.1* 10^(16)Kg.m^2/s^2=m* (3* 10^8m/s)^2$

$m=9.0* 10^(-1)Kg$

Therefore, the mass lost in this reaction will be, $9.0* 10^(-1)Kg$

A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of NH4NO3 is 80.03 g/mol; the molar mass of water (H2O) is 18.01 g/mol. What mass, in grams, of H2O is produced?

Answers

the answer
the general equation of the reaction is
NH4NO3 -------------- N2O + 2H2O

The molar mass of NH4NO3 is 80.03
The mass of NH4NO3 is 160.1 g
so we can deduce that

nNH4NO3 = number of mole of NH4NO3 = 160.1 g / 80.03 =2 moles
by using proportion property

NH4NO3 -------------- N2O + 2H2O
1mole 1mole 2 moles
nNH4NO3 nH2O

the number of mole nH2O can be found by

1/ nNH4NO3 = 2 / nH2O

nH2O = 2 x nNH4NO3 = 2 x 2 = 4 moles
to find the mass, we use

mH2O = 4 moles x 18.01 g /mol = 36 g

Answer:

80.0

Explanation:

edge 2020

The relatively high boiling point of water is due to water having(1) hydrogen bonding
(2) metallic bonding
(3) nonpolar covalent bonding
(4) strong ionic bonding

Answers

The correct answer is option 1. Water has a relatively high boiling point due to the presence of hydrogen bonding between atoms. Hydrogen bonding is said to be the most powerful or strongest intermolecular force as compared to others therefore it has a higher boiling point because higher energy is needed to break this bond.

14 Which phrase describes a molecule of CH4, in terms of molecular polarity and distribution of charge?(1) polar with an asymmetrical distribution of charge(2) polar with a symmetrical distribution of charge
(3) nonpolar with an asymmetrical distribl1tion of charge
(4) nonpolar with a symmetrical distribution of charge

Answers

Answer: option (4) non polar with symmetrical distribuition of charge.

Justification:

1) First you have to study the presence of dipoles.

The dipoles are polar bonds with separation of positive and negative charges.

The dipoles are formed when two different atoms each with different electronegativity form a polar bond.

In this case the chemical bonds are between C and H, i.e. C - H.

The elecronegativity of C is 2.55 and the electronegativity of H is 2.20, then the difference is 2.55 - 2.20 = 2.30. This is a small difference so the C - H bonds is generally considered non polar.

2) Now look at the geometry of the molecule.

The four C atom is at the center and the four C - H bonds around the C atom form a molecule completely symmetrical, and any charge would distributed symmetrically.

The correct phrase describing a molecule of $\text{CH}_4$ in terms of molecular polarity and distribution of charge is $\boxed{\left( 4 \right){\text{ nonpolar with a symmetrical distribution of charge}}}$ .

Further Explanation:

Electronegativity difference is the major factor in order to govern whether the bond is polar or nonpolar. In other words, it determines the polarity of any chemical bond. A molecule is called polar if there exists an electronegativity difference between the bonded atoms. A molecule is called nonpolar if it has no or very less electronegativity difference between its atoms.

Symmetry of the molecule is also useful for the determination of polarity of any bond. If the shape of the molecule is symmetrical, it has no polarity. But if asymmetry is present in the molecule, it is said to be nonpolar.

The formula to calculate the electronegativity difference between C and H in ${\text{C}}{{\text{H}}_{\text{4}}}$ molecule is as follows:

${\left( {{{\Delta EN}}} \right)_{{\text{C - H}}}} = {\left( {{\text{EN}}} \right)_{\text{C}}} - {\left( {{\text{EN}}} \right)_{\text{H}}}$ …… (1)

Here,

${\left( {{{\Delta EN}}} \right)_{{\text{C - H}}}}$ is the electronegativity difference between C and H atoms.

${\left( {{\text{EN}}} \right)_{\text{C}}}$ is the electronegativity of carbon.

${\left( {{\text{EN}}} \right)_{\text{H}}}$ is the electronegativity of hydrogen.

The electronegativity of C is 2.5.

The electronegativity of H is 2.1.

Substitute these values in equation (1).

$\begin{aligned}{\left({{\Delta EN}}} \right)_{{\text{C - H}}}} &= 2.5 - 2.1\n&= 0.4\n\end{aligned}$

The electronegativity difference between C-H bonds in ${\text{C}}{{\text{H}}_{\text{4}}}$ is 0.4, which is quite low. So ${\text{C}}{{\text{H}}_{\text{4}}}$ is a nonpolar molecule.

In ${\text{C}}{{\text{H}}_{\text{4}}}$ , the position of hydrogen atoms is symmetrical with respect to that of the central carbon atom (For structure, refer to the attached image). So this molecule has a symmetrical distribution of charge.

Learn more:

Which type of bond is formed between water molecules? brainly.com/question/1059245
How many covalent bonds can nitrogen form if each unpaired electron participates in bonding? brainly.com/question/6029316

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: nonpolar, polar, symmetry, electronegativity difference, 2.5, 2.1, 0.4, low, CH4, electronegativity of C, electronegativity of H.

The digestion process starts in the _____. esophagus stomach small intestine mouth

Answers

this is probably a little late lol but the answer is the mouth, because when you chew food, it releases nutrients into your body.

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