18 grams
4 kilograms
8 kilograms

Answer:

Explanation:

Answer:

Applied research

Explanation:

The process of developing a new vaccine involves the use of known scientific theories to address specific problems. Here, the outcome of several basic research are put into use to arrive at a targeted outcome. This outcome/product can be continuously modified (if it shows early promise) until the desired effect is achieved and if no "promise" is discovered at critical points of this research, work on this theory (for this research) is suspended another theory is pursued.

This process (described above) in which scientists continuously develop new treatments and/or vaccines and continuously subject it to testing until the desired effect is achieved can be referred to as Applied research.

Answer: C. Do not try to clean up a spill.

Explanation:

Answer:

Heavy elements are created by fusing two elements together in a lab. They look for “events” that comprise a series of alpha decays that result in spontaneous fission.

Explanation:

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, in below given ways we can summarize how heavy elements are created.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Elements heavier than iron cannot be created by fusion because the reaction requires energy to occur. We do, however, perceive elements other than iron all around us. This is accomplished by supernova explosions, which result in neutron capture processes and the production of heavy materials.

Therefore, in above ways we can summarize how heavy elements are created.

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Answer: 6

Explanation:

Because it's 6 after the decimal

Answer:

(a) 20,000 seconds

(b) 333.33 repeating minutes

(c) 0.0006341958 years

Answer:

organic chemistry

Explanation:

There are many branches of chemistry. Some of them are physical chemistry, analytical chemistry, inorganic chemistry and organic chemistry.

A chemist is testing the quality of a wine produced by a vineyard. It means he will test the structure, properties, and preparation of wine. All these tests comes under organic chemistry.

Hence, the correct option is (d) "organic chemistry"

Answer:

analytical chemistry

Explanation:

I took the test

Answer:

Chemical property

Physical property

Chemical change

Physical change

Answer:

For example: O2- indicates an ion of oxygen having two extra electrons. I.e., since an oxygen atom normally has 8 protons and 8 electrons, this ion has 10 electrons (-10 charge) and 8 protons (+8 charge) giving it a charge of -2 (-10 + 8 = -2).

Carbon has a total of six electrons and there are a total of ten electrons in the oxygen ion.

What we can easily find in common with carbon and oxygen atom is the fact that the both of them have two shells. We can also refer to these shells as energy levels.

In both atoms, the first shell contains only two electrons. For carbon, the second shell contains four electrons while the second shell of oxygen ion contains eight electrons.

Hence, Oxygen ion has two electrons in the first shell and eight electrons in the second shell(total of ten electrons) while carbon has two electrons in the first shell and four electrons in the second shell (a total of six electrons).

The electronic configuration of carbon is: 1s2, 2s2, 2p2

The electronic configuration of oxygen ion  is: 1s2, 2s2, 2p6

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Answer:

i really dont know

Explanation:

byeeeeeeeeeeeee

The phrase "where light is hitting an object" refers to the specific points or areas on the surface of an object that are directly exposed to light.

These are the regions where photons from a light source directly interact with the object's surface.

When light hits an object, it can be absorbed, reflected, or transmitted depending on the object's properties. The areas where light is hitting will typically appear brighter or illuminated, while the areas in shadow or not directly exposed to light will appear darker.

The distribution of light hitting an object plays a crucial role in determining its visibility, color, and overall appearance.

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Answer:

0.003221

Explanation:

When we multiply anything by 10 times a power, we follow the base 10 decimal system.

To convert 3.221 × 10⁻³ from scientific notation to standard notation, simply move the decimal place 3 places to the left:

3.221 × 10⁻³ = 0.003221

Answer:

as a lipid bilayer

Explanation:

just took the test

Answer:

A. as a lipid bilayer

The atomic number is 4.

The atomic number of the given atom is equal to 4.

The atomic number (symbol Z) of a chemical element can be defined as the charge number of an atomic nucleus. For an ordinary atom, the atomic number is equal to the number of protons found in the nucleus of an atom of that element.

The atomic number helps to uniquely identify ordinary chemical elements. In an ordinary uncharged atom or neutral atom, the atomic number of that atom is also equal to the number of electrons.

For a neutral atom, the sum of the atomic number and the neutron number gives the atomic mass. The protons and neutrons have approximately the same mass. Atoms that have the same atomic number but different numbers of neutrons or different mass numbers are known as isotopes.

Given the number of electrons in the atom is 4. Therefore, the atomic number of that atom will be equal to 4.

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Answer:form when magma and lava cool :/

Explanation:hope this helps, and I’m this because ingenious rocks are made/ formed from magma and lava.

The phrase which best describes igneous rocks is option A, .i.e., it forms when lava and magma cool.  

Igneous rocks are formed by the melting of  earth's crust  into magma, . The two types of this rocks are, Extrusive and intrusive igneous rocks . The slow cooling of magma beneath the surface results in intrusive igneous rock.

Magma in the crystal is in molten liquid state which heat by convection and flows out. This creates slight movement in plates and the hot mantle the cools down to form igneous crystals.

Extrusive igneous rock is created when lava above the surface cools quickly. The magma hardens more quickly after being brought to the surface via cracks or volcanic explosions. As a result, these rocks are crystalline, smooth, and fine-grained.

Thus regarding the formation of igneous rocks, option A is correct.

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Answer: A, C, E

Explanation: PLATO. all testable questions.

Answer:

1.It stays the same

Explanation:

because its only the natural stature of it has changed

Answer:

A.   AlO

Explanation:

The empirical formula of a compound is the simplest possible formula giving the ratio of atoms in a molecule of the compound.

We know that Aluminium forms [tex]Al^{3+}[/tex] and oxygen forms [tex]O^{2+}[/tex].

As such the formation of the ionic compound between a metal and non-metal results into [tex]Al_2O_3[/tex].

The empirical formula is as follows:

 Element                       Aluminium           Oxygen

% composition

by mass                              26.98                    16.0

mole ratio                           26.98/26               16/16

                                    =  1.04                              = 1

divided by the

smallest number            1.04/1                             1/1

                                        1.04                             1

The empirical formula is AlO

Answer:

See explanation

Explanation:

Biology- digestion of food materials

Chemistry- dissolving salt in water

Astronomy - observing day and night

Physics - watching a television

Geography - observing weather changes during the day

Answer:  D) Electrons

Explanation:

Daltons atomic theory was electrons

Answer:

the mass of an object depends on inertia greater is the inertia greater will be the mass or vice versa

Explanation:

hope it help ^_^

Mass is the most basic property of matter and it is one of the fundamental quantities. Mass is defined as the amount of matter present in a body. The SI unit of mass is the kilogram (kg). The formula of mass can be written as:

Mass = Density × Volume

The mass of a body is constant; it doesn’t change at any time. Only in certain extreme cases when a huge amount of energy is given or taken from a body, the mass may be impacted. For example, in a nuclear reaction, a tiny amount of matter is converted into a huge amount of energy, this reduces the mass of the substance.

There are various units for calculating mass, like, kilograms, grams, lbs, pounds, etc., but the SI unit of mass is "kilograms" or kg. Every unit of mass can be converted to other units by using a proper conversion formula without affecting the meaning and essence of the quantity to be measured.

HENCE,MASS OF AN OBJECT DEPENDS ON:

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A theory that is not supporting global warming is Carbon dioxide is an insignificant greenhouse gas. D is correct.

Global warming is the long-term heating of Earth’s surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere. This term is not interchangeable with the term "climate change."

Our world is heating up. Because of global warming, temperatures are increasing and extreme weather is becoming more common. If we don't take preventative action now, future generations will be faced with warmer temperatures, as well as higher sea levels, extreme weather events, crop failures, extinctions, and other devastating effects.

Greenhouse effect is the reason for global warming and it happens because of absorption of gases like CO₂ and CH₄ in our environment.

Therefore, A theory that is not supporting global warming is Carbon dioxide is an insignificant greenhouse gas. D is correct.

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Answer:

The Bohr model shows the atom as a central nucleus containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus (Figure 1). These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the various shells

Given :

Normal atom.

To Find :

The ratio of protons to electrons in all normal atoms.

Solution :

Here normal atom means neutral atoms i.e atoms whose charge is zero.

Atom charge is zero when number of proton are equal to number of electrons.

[tex]N_p=N_e[/tex]

So, [tex]\dfrac{N_p}{N_e}=1[/tex]

Therefore, the ratio of protons to electrons in all normal atoms is 1.

Hence, this is the required solution.

Answer:

1.6%

Explanation:

12.5 ml - 100%

12.3 ml - x %

x = (12.3*100)/12.5

x = 98.4%

Error = 100 - 98.4 = 1.6%