Scientific Notation - PLEASE HELP!

Answer:

A: Control Group

Explanation:

The control group is part of an expierment left untouched by anything that could possibly alter it, in the case of this question, the students have two groups of plants that have drops of liquid that could alter them, in order to see the growth, and to see if the liquid actually did anything, in order to do so, you would have to have a untouched plant, that shows what it looks like with out any alteration from researchers. So the answer would be control group.

Answer:

i think control group?

Explanation:

meow x3 UwU

Answer:

Atoms making liquids have less attraction than solids, but more than gases

Explanation:

The attraction between atoms in different molecules in a solid is very strong due to strong intermolecular forces present in a solid. However, such intermolecular forces are weaker in liquids than in solids.

This implies that the solid has higher intermolecular forces of attraction compared to gases and liquids. Based on the negligible degree of intermolecular forces between them, a gas has the weakest intermolecular forces hence the atom has very minimal interaction between them.

Answer:

D

Explanation:

because it's saying the diet soda has more calories then regular soda it's like someone claimed you of doing something you didn't do and they don't know that

Answer:

2.7005 g/cm²

explanation: as we know density=mass/volume

Answer:

2

Explanation:

Oxygen has 6 electrons in its valence shell.  Since an atom can have a maximum of 8 electrons in the valence shell, oxygen has 2 empty spots in its valence.  This means that oxygen can make 2 single covalent bonds.

The maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen is: 2.

Valency can be defined as a measure of the combining power of a chemical element with other atoms to form a molecule or chemical compound.  Typically, valency is measured by the amount of hydrogen atoms that a chemical element can combine with or displace to form a molecule or chemical compound.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others.

From the periodic table, we know that an oxygen atom has an atomic number of eight (8). Thus, oxygen has six (6) electrons in its valence shell and two (2) empty shells to form a covalent bond with hydrogen.  

Generally, the maximum number of electrons an atom can hold in its valence shell is eight (8) and since oxygen has has six (6) electrons in its valence shell; it ultimately implies that the maximum number of covalent bonds that an oxygen atom with atomic number of eight (8) can make with hydrogen is two (2) covalent bonds.

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Answer:

He is probably studying Geomorphology.

Explanation:

Geology is the science that studies the composition, structure, dynamics, and history of planet Earth, the processes by which it has evolved including everything that has to do with its natural resources and with this the processes that affect the surface, and therefore, the environment.

Geomorphology is a branch of geosciences, more specifically geography and geology. One of his most interesting models explains the ways in which the earth's surface is the result of a consistent dynamic balance.

Answer:

32.23 to 4 significant figures.

Explanation:

The molar mass of the element is the mass of 6.022 * 10^23 atoms (Avogadro's number).

So by proportion it is 6.022 * 10^23 * 3.88 / 7.25 * 10^22

= 32.23 to 4 significant figures.

Answer:

The number of hydrogen atoms in 36.04 g  sample of steam is 2.408 × 10²⁴ atoms of hydrogen

Explanation:

The  given parameters are;

The mass of the sample of water, H₂O = 36.04 g

From the principle of conservation of matter, the mass of the water = The mass of the steam, therefore;

The mass of the steam = 36.04 g

The molar mass of H₂O = 18.01528 g/mol

Therefore, the number of moles, n, of H₂O in the 36.04 g of steam is given as follows;

n = Mass/(Molar Mass) = (36.04 g)/(18.01528 g/mol) = 2.00052399963 ≈ 2 moles

The number of molecules of H₂O per mole of H₂O is geven by the Avogadro's number = 6.02 × 10²³ molecules

Therefore;

The number of H₂O in 2 moles of H₂O = 2 × 6.02 × 10²³ = 1.204 × 10²⁴ molecules

The number of hydrogen atoms per molecule of H₂O = 2 hydrogen atoms

Therefore;

The number of hydrogen atoms in the 1.204 × 10²⁴ molecules of H₂O = 2 × 1.204 × 10²⁴ molecules of H₂O

Which gives;

The number of hydrogen atoms in the 1.204 × 10²⁴ molecules of H₂O = 2.408 × 10²⁴ atoms of hydrogen

Therefore;

The number of hydrogen atoms in 36.04 g  sample of steam = 2.408 × 10²⁴ atoms of hydrogen.

Answer:

An oleophilic material is an entity which exhibits a higher affinity for oil than other solvents. The non-polar nature and ability to form cluster-like structures called micelles are the characteristic properties of oleophilic materials.

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Answer:

Explanation:

All it takes is a momentary lapse in concentration. When you are in the laboratory and take a direct sniff of the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs.

Answer:  The size, mass, and arrangement of atoms affect the density of a substance. How might these factors work together to cause a substance to have a high density? A substance with smaller more massive atoms that are close together is going to have a higher density.

Explanation:

Answer:

C. 7.020 x 10^2 g

Explanation:

To convert to scientific notation, move the decimal until there is only one digit greater than 1 and less than 10 before the decimal. In this case, the 7. (Depending on the conversion, you will either move the decimal to the left or right. In this question, you will need to move it left. When you move the decimal left, you inherently think you are moving it in the negative direction, but your final answer will be a positive exponent. The opposite is true for movement in the right direction, leaving a negative exponent in your final answer.)

Then, count the number of places that you moved the decimal from the original number (in this case, you moved it 2 decimal places to the left).

Because you moved the decimal 2 places to the left (-), when you write it in scientific notation, you want to annotate the exponent as the opposite, (+), so that you do not lose the equivalence of the original number (in this case, state it as 10^2 as in choice C).  

Note: Once you do your conversion, you can plug it into your calculator and press "=" to verify that you did not change the number in doing your conversion.

Taking into account the definition of Scientific notation, the correct representation of 702.0 g in scientific notation is option C. 7.020×10² g.

First of all, scientific notation is a quick way to represent a number using powers of base 10. This notation is used to be able to express very large or very small numbers very easily.

The numbers are written as a product:

a×10ⁿ

where:

In this case, to write the number 702.0 in scientific notation, the following steps are performed:

So, the correct representation of 702.0 g in scientific notation is option C. 7.020×10² g.

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Answer:

3.

Explanation:

There are four nitrogenous bases in a DNA including guanine (G), adenine (A), cytosine (C) and Thymine (T) and together they form the nitrogenous base sequence arranged in a specific order of three letters such as GAC and TAG to form a genetic code.

These nitrogenous base sequences forming genetic code are amino acid specific and determine the amino acid sequence in DNA. for example: CTT determines leucine and GTT determines valine.

Hence, the correct option is "3".

Answer:

True

Explanation:

I guessed XD But I also used Google and that's what I got

Answer:

It's a list of metals from most to least reactive.

Explanation:

You should be able to find it listed really easily online.

Answer:

Different ions of different elements (usually metals) make a flame burn with a characteristic color when introduced into the reaction zone; the different colors are caused by the different quantized energy levels of the electrons in the different atoms.

Answer:

b

Explanation:

Answer:

I needed to use good precision in my measurement for my chemistry lab

Explanation:

Answer:

Explanation:

Dmitri Mendeleev developed a chart-like arrangement of the elements called the Periodic Table ______ . He stated that if the elements were listed in order of increasing atomic mass______, their properties repeated in a regular manner. He called this the periodicity of properties ______ of the elements. The arrangement used today differs from that of Mendeleev in that the elements are arranged in order of increasing atomic number______. Each horizontal row of elements is called a(n)period ______. Each vertical column is called a(n) column_____, or , because of the resemblance between elements in the same column, a(n) __group____.

1. Dmitri Mendeleev developed a chart-like arrangement of the chemical elements called the: periodic table.

2. According to Dmitri Mendeleev, the properties of chemical elements are repeated in a regular manner, if the chemical elements were listed in order of increasing: atomic mass.

3. Dmitri Mendeleev called the increasing order of chemical elements on the periodic table: the Periodic Law of the elements.

4. The arrangement used today differs from that of Dmitri Mendeleev in that the chemical elements are arranged in order of increasing: atomic number.

5. Each horizontal row of chemical elements is called a: period.

6. Each vertical column is of chemical elements is called a: group.

7. Because of the resemblance between chemical elements in the same column, each vertical column is called a: family.

Dmitri Ivanovich Mendeleev was a Russian chemist and inventor who was born on the 8th of February, 1834 in Tobolsk, Russia.

He formulated the Periodic Law and devised the periodic table of chemical elements.

On a periodic table, each horizontal row of chemical elements is called a period while each vertical column is of chemical elements is called a group.

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Answer:

Periods are horizontal rows while the groups are the vertical columns on the periodic table.

Answer:

A and C

Explanation:

A; Animals inhale and exhale, breath oxygen, leave carbon dioxide.

C; We fart, so do they! (farts are a release of methane gas from our bodies) Just ask my dog...

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The molecule(s) in the atmosphere that comes from animals is -

Humans and other animals contribute to the atmospheric gas cycle such as nitrogen gas, oxygen gas, carbon dioxide, and other gases. Animals give up mainly two gases in the atmosphere that are:

Thus, the molecule(s) in the atmosphere that comes from animals is -

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Answer Scientist

Explanation:

Answer:

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Explanation:

i took the test:P

Hope this helps!

Answer:

4 sig figs.

Explanation:

Significant Figures Rules:

1. Anything that isn't a zero is a sig fig

2. If a decimal point comes after the ones digit, everything before the decimal is counted as sig fig (i.e 2000. would be 4 sig figs).

3. If we are dealing with small decimals, the zero before and after the decimal (i.e 0.002) is a placeholder and is not counted as sig figs.

4. Any zeros between 2 significant digits is considered in sig figs (i.e 2002 would be 4 sig figs).

We look at 0.001022.

We know that 0.00 are not sig figs and are placeholders.

We know that 1022 are significant digits and figures, and we have 4 of them.

Therefore, we have 4 sig figs.

My answer to the question is 4 significant figures.

Isotopes of the same element have the same atomic number and different mass numbers. Hence, option C is correct.

Isotopes are defined as chemical species which have the same number of protons but differ in the number of neutrons.

It can also be said that they are the chemical species of the same element which have the same atomic number but have different mass numbers.

For Example, C12 and C14 are the isotopes of carbon elements, which have the same atomic number but a different mass numbers.

Hence, option C is correct.

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Answer:

a.) Its compounds can only be chemically separated into the elements that make it up.

The compound of water can only be chemically separated into the elements that make it up. The correct option is A.

A compound is made up of atoms from different elements that have been chemically combined in a specific ratio.

A mixture is a combination of two or more substances in which no chemical reaction or combination occurs. Compounds are made up of different elements arranged in a specific order via chemical bonds.

Atoms/molecules are (chemically physically) combined in a compound so that the elements that comprise the compound (retain/lose) their identities and take on a new set of properties.

The most common chemical methods of isolation and purification are distillation, crystallization, adsorption, membrane procedures, absorption and stripping, and oxidation.

Because each water molecule is made up of two hydrogen atoms and one oxygen atom, water can only be decomposed chemically.

Thus, the correct option is A.

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