Chemistry High School

Which of the following best describes a person doing science?
o A.
Dominick uses a computer to do his math homework.
O B. Lindsay measures the sizes of the craters on the Moon.
O C.
Isabel invents a new kind of doorknob.
o
D. Murray randomly predicts the result of a coin toss.

Answers

Answer 1

Answer:

B. Lindsay measures the sizes of the craters on the moon

Answer 2

Answer:

I think it's D but it's my (viewpoint)

Related Questions

A student measures the sides of a cube with a ruler and finds that the length of each side is 2.70 cm what is the volume of the cube in centimeter cubed

Answers

Answer

V= 19.68cm^3

Explanation:

V=a^3

a=2.70cm

V=2.70cm^3

2.70^3= 19.68

V=19.68cm^3

Answer:

V= 19.68 cm^3

Explanation:

V= a^3

V= 2.70cm^3

V= 19.68cm^3

electron configuration for silicon

Answers

Answer:

1s2, 2s2, 2p6, 3s2, 3p2

Explanation:

see the guide on the given electron configuration examples

What is the energy of a 3.12 x 10^18 s-1 wave?
A. 4.75 x 10 ^42 J
B. 5.74 x 10^-7 J
C. 2.07 x 10 ^15 J
D. 8.6 x 10 ^ 4 J

Answers

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of wave is 2.08×10⁻¹⁵J.

What is electromagnetic wave?

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave .There is a relation between energy of wave. frequency of wave

Mathematically,

E=hv

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

v= frequency of wave

substituting the given values

E= 6.67×10⁻³⁴js×3.12 x 10¹⁸ s⁻¹

E= 2.08×10⁻¹⁵J

Therefore the energy of wave is 2.08×10⁻¹⁵J.

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4. How does the water vapor change as altitude increases?

Answers

Answer:

it drifts through the atmosphere and the vapor absorbs heat then the warm air rises up therefore leaving the planet's surface and releasing the heat back into the upper part of the atmosphere

50.5 kilometers to feet

Answers

50.5 km to ft is 165682.4

Answer:

the other guy is right its 165682.415

Lara’s chemistry teacher has a decorative metal cube on her desk. The underside of the cube indicates that is made of stainless steel. However, Lara thinks it is too heavy to be this metal. She researches the density of stainless steel and finds it is 7.85g/cm³. She carries out this experiment to verify if the cube is actually made of stainless steel.

Answers

Answer:

D: 4, 5

Explanation:

Which of the following is a unit for acceleration?

A) m/s

B) m/s2

C) s/m 2

D) s/m

Answers

Acceleration by definition is the change in velocity per change in unit of time.
That is Δv/Δt

Velocity is in meters per second, time is in seconds. When you actually calculate acceleration, you get (m/s)/(s). You could move the s in the velocity to the bottom or cross multiply, but in the end you get m/s^2

Answer B

How many moles of titanium are there in 32.5 grams of titanium?

Answers

Answer:

0.159 moles of Ti

Explanation:

32.5 g of Ti x (1 mol of Ti / 204.4 g of Ti) = 0.159 moles of Ti

what are class C fire extinguishers used for

Answers

they are used on fires that involve electricity such as electrical fires which can be very dangerous

Lactic acid, C3H6O3, is a monoprotic acid that is available in solid form. Determine the concentration of an unknown solution of sodium hydroxide, in moles per litre, given that it takes 18.34 mL to neutralize a solution containing 0.821 g of lactic acid. Write a balanced chemical equation for the reaction .

Answers

Answer:

0.497 moles/L

Explanation:

The reaction that takes place is:

C₃H₆O₃ + NaOH → C₃H₅ONa + H₂O

First we calculate the moles of lactic acid in 0,821 g, using its molar mass:

0,821 g ÷ 90 g/mol = 9,122x10⁻³mol lactic acid

One mole of lactic acid reacts with one mole of sodium hydroxide (it is a monoprotic acid), so in 18,34 mL of NaOH solution there are  9,122x10⁻³moles of NaOH:

18.34 mL ÷ 1000 = 0,01834 L 9,122x10⁻³mol ÷ 0,01834 L = 0.497 moles/L

What is the density of a 805 g sample of pure silicon with a volume of 2.3 cm3?

Answers

The density of it would be 57. Do the math and apply the formula to it and you would get this answer.

I WILL GIVE YOU BRAINLIEST!!!

Refer to the Newsela article "How You Can Make a Solar Oven To Cook with a Pizza Box."

What is the author's purpose in mentioning variables in designing the solar oven?


to show how easy it is to produce solar energy

to encourage readers to vary the design

to explain how wasteful solar energy production can be

to show the author did not think too hard about the design

Answers

Answer:

Encourage readers to vary the design

Explanation:

Harry stores toxic chemical waste in a large steel tank that has only 15% of its volume underground. Jena lives in the wilderness and has her own gas pump connected to a 1,500-gallon tank of gasoline buried ten feet underground near her garage. Lars keeps three large tanks filled with formaldehyde and battery acid in his basement. Which of these people are covered by federal regulations regarding USTs?

Answers

Answer:

Only Harry and Jena

Explanation:

Under federal regulations, an UST is any one or a combination of tanks such that the volume of an accumulation of regulated substances is 10% or more beneath the surface of the ground.

Any UST system holding a mixture of hazardous waste and other regulated substances are also are not covered by federal regulations regarding USTs.

Farm or residential tank of capacity more than 11 gallons used for storing motor fuel is covered by federal regulations regarding USTs.

According to the given question,

Only Harry and Jena are covered by federal regulations regarding USTs.

Which 2 energy transformations are shown in the photo? Please help!!

Answers

Answer:

The answer Is B. Chemical energy--> electromagnetic energy

Answer:

B. Chemical energy ---------> electromagnetic energy

D. Chemical energy  ---------> thermal energy

Explanation:

I took the quiz

12
How many electrons shells would an atom of Sulfur have?Locate on your Periodic Table*
(5 Points)
03
6
16
O 32
13

Answers

There are 16 electrons in sulfur and three shells. Two in shell one, eight in shell two, and six in shell three.

An ionic bond occurs between a ___ and ___

Answers

Answer:

An ionic bond occurs between two opposite charges are attracted

Explanation: Two opposite charges are attracted to each other

Helppp. Calcium reacts with bromine to form Calcium bromide
Ca - - - - > Ca+2

Br2 - - - - > 2br

A. Complete the equation by adding electrons

Answers

[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]

Actually Welcome to the Concept of the Chemical Bonding.

Since we know that, calcium shares 2 electrons and Bromide being a halogen accepts 1 electron at a time,

So 2 bromides combine together to form a bond with Calcium, so we get as,

Ca2+ + 2Br -----------------------> CaBr2

CaBr2 is the compound formed.

PLEASE ANSWER SOON THIS IS DUE IN LIKE, 5-10 MINS

Which pair have the same electron configuration? You may use the periodic chart

Cl- and Ar

Cl and Ar

Cl- and Ar-

Cl+ and Ar

Answers

The answer is Cl- and Ar

Good luck

why do astronomers use frequencies other than the visible ones when they are investigating the universe?

Answers

Because different objects give out electromagnetic radiation at different frequencies. Some objects are very ea...

Hope this help

1. How many moles are contained in 103.4g of sulfuric acid?
a) 2.9 * 10^22 molecules of sulfuric acid
b) 5.18 * 10^24 molecules of sulfuric acid
c)12.1 * 10^23 molecules of sulfuric acid
d) 6.35 * 10^23 molecules of sulfuric acid

Answers

It is b I hope this helps

On a separate sheet of paper solve the following problem: How many cups are
in 3.5 gallons? (1 gal = 16 cups)
Type your answer...

Answers

Answer:

48 cups

Explanation:

16 x 3.5 = 48

Since one gallon is 16 cups, it would be done like this

In the first propagation step of the bromination of 2,3-dimethylbutane, the newly formed Br radicals react with the molecules of 2,3-dimethylbutane. Give the major products formed by the first propagation step including both organic and inorganic products. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. Include all free radicals by right-clicking on an atom on the canvas and then using the Atom properties to select the monovalent radical.

Answers

Answer:

See explanation

Explanation:

When the bromine free radical attacks 2,3-dimethylbutane, two free radicals may result. One of them is primary (formed by attack on then end -CH3 group) the other is secondary.

Recall that the order of stability of free radicals is tertiary > secondary > primary > methyl.

Hence the secondary free radical is more thermodynamically stable hence it is the major free radical formed in the first propagation step.

which cells carry nutrients from food to the rest of the cells in the body?​

Answers

Answer: The circulatory system.

Explanation: The circulatory system, which is part of the "cardiovascular" system, is one of the eleven organ systems of the human body. Its main function is to transport nutrients to cells and wastes from cells (Figure 3.4. 1). This system consists of the heart, blood, and blood vessels.

The blood cells carry nutrients from food to the rest of the cells in the body.

What is the circulatory system?

The human circulatory system moves important nutrients and minerals throughout the body and metabolic waste products out from the body. The human circulatory system contains blood, blood vessels, heart, and lymph.

The human circulatory system provides essential nutrients, minerals, oxygen, and hormones to different parts of the body and is responsible for collecting toxins from the cells and tissues to be purified or eliminated from the body.

The human circulatory system contains a wide network of blood vessels. These constitute arteries, veins, and capillaries. The primary function of blood vessels is to transport nutrients and oxygenated blood to all parts of the body.

The Circulatory system helps in sustaining all the organ systems and transports blood, nutrients, oxygen, and hormones throughout the body. It secures cells from pathogens and acts as an interface for cell to cell interaction.

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An ionic bond would form between which pairs of elements? atomic number 4 and atomic number 18 atomic number 7 and atomic number 8 atomic number 3 and atomic number 4 atomic number 8 and atomic number 12

Answers

Answer:

atomic number 8 and atomic number 12

Explanation:

atomic number 8 and atomic number 12 , element with the atomic number 8 is oxygen, and the element with atomic number 12 is Magnesium

Magnesium has low ionization energy, hence higher tendency to loose its two outermost electrons to form positive ion.

Oxygen has high electron affinity, hence higher tendency to accept or gain electrons to form negative ion.

The electronegativity difference between the element with atomic number 8 and element with atomic number 12 is greater for the formation of ionic bond

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

atomic number 8 =oxygen

atomic number 12= Magnesium

Magnesium has a low ionization energy and so a greater proclivity to lose its two outermost electrons to create a positive ion. Because oxygen has a high electron affinity, it is more likely to accept or acquire electrons to create a negative ion.

Therefore, the correct option is option C.

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Convert 380 K to degrees F.​

Answers

Answer:

224.33

Explanation:

Answer:

224.33

Explanation:

Which of the following represents a pair of isotopes?
A. Ca+2, Be+2
B. 12C, 14C
C. Fe+2, Fe+3
D. 7N, 8O

Answers

B.
Isotopes is an atom has same number of electrons and protons but different number of neutron.

We have that

the Carbon isotopes represents a pair of isotopes

12C, 14C

Option B

From the question we are told

Which of the following represents a pair of isotopes?

A. Ca+2, Be+2 B. 12C, 14C C. Fe+2, Fe+3 D. 7N, 8O

Generally

Isotopes

This is defined as variant forms of an element with variant atomic mass but same proton number

Therefore

the Carbon isotopes represents a pair of isotopes

12C, 14C

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The_____
is an organelle that can give instructions for a
cell to reproduce and send directions to organelles to make needed
materials.

Answers

Answer:

nnmnm

Explanation:

explain how are you able to drink liquid through a straw

Answers

Answer:

the suction pulls out the air in the straw and the liquid comes up with the suction.

Answer:

ya that is correct

Explanation:

What was the time frame?

500 Million Years Ago

900 Million Years Ago

650 Million Years Ago

4.6 to 4 Billion Years Ago

Answers

Answer:

If you are referring to the Precambrian time, the answer is 500 Million Years Ago.

Explanation:

Precambrian time is the time period that started with the formation of Earth and ended about 500 million years ago.

What are the 3 ways that materials can bond?

Answers

Answer:

Ionic bonding

covalent bonding

metallic bonding

Answer:

Iether they Heat up and melt together, Gravity pulls them together into one, Or the atoms inside one decide to bond with the other.

Explanation:

Question 3 is weird but I ran out of answers.

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