Since Russia and the U.S.A have discovered new features on planets using spacecraft in modern times, this is an example of: C. how contributions by many different cultures throughout history have advanced our understanding of the solar system.
What is a solar system?A solar system can be defined as a collection of the outer and inner astronomical or planetary bodies (planets) alongside the Moon that are in orbit around the Sun, in slightly elliptical orbits.
What is culture?Culture simply refers to the general way of life of people in a specific society or geographical area. This ultimately implies that, culture is a terminology which can be used to describe a sum total of the norms, beliefs, clothes, language, foods, and behaviors which a group of people that are living in a geographical area share in common.
In this context, we can reasonably infer and logically deduce that contributions by various cultures around the world have helped us to advance our understanding of the solar system.
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How do invertebrates affect the oxygen levels of compost and soil?.
Invertebrates affect the oxygen levels of compost and soil by reducing it.
How respiration works?Cellular respiration is the process by which living organisms obtain energy by breaking down food molecules in their cells.
Every living organism undergoes the process of cellular respiration and make use of oxygen molecules in the process.
This means that invertebrates will make use of the oxygen gas present in compost and the soil for respiration, hereby reducing it.
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Answer: Burrows create spaces for oxygen to flow through the soil.
Explanation:
I just took the test
What is the vertex of the parabola in the graph?
1
19
6
4
2
X
-6
-2
-2
-4
Answer:
(-3, -4)
Explanation:
The vertex is the point/dot that is in the middle of the graph. Imagine a vertical invisible line splitting the U in half, equal parts.
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A train travels 200 miles at an average speed of 50 miles per hour. How long does it take the train to travel this distance?
Answer:
The answer is 100 m/p/h because you divide the total 200 miles and the 50 speed and you get about 100 m/p/h
Explanation:
Which is the smallest particle into which a compound can be broken down
and still remain the same compound?
A) atom
B) mixture
C) element
D) molecule
Answer:
molcule
Explanation:
Mikayla says that air is an element since it has oxygen in it. Jose says that air is a mixture because each part of air keeps its properties. Grant says that both Mikayla and Jose are wrong, because air is a compound. Who is correct and why? Group of answer choices
Answer: Jose is correct because air is a mixture of gases ( both elements and compounds).
Explanation:
An element consist of only one type of atom and a compound made up of 2 or more types of elements joined together ( by ionic or covalent bonds).
Whereas air around us is a mixture of gases (both elements and compounds) like nitrogen, oxygen, argon, and carbon dioxide, and very small amounts of other gases and water vapors
Hence, Jose is correct because air is a mixture of gases ( both elements and compounds).
Just like the terrestrial inner planets, which are made of rock and metal, the gas planets have solid surfaces covering mantles and cores.
A. True
B. False
Answer:
B. False
Explanation:
The gas planets are called so because they are composed of gases and solid materials. Therefore, they cannot have solid surfaces covering mantle and core as they cannot exist.
The change in the free energy of a reaction(ΔG) is equal to
1. TΔH - ΔS
2. TΔH + ΔS
3. ΔH - TΔS
4. ΔH + TΔS
Answer:
The answer is Third one
what is the percent composition of sulfur in FeSO4
Answer:
36.8%
Explanation:
Ferrous sulfate has the composition 36.8% Fe, 21.1% S and 42.1% O.
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In paragraph 2, attraction and repulsion refer to _____.
A electric and magnetic fields
B atomic theories
C tiny particles
D solid atoms
Answer:
I guess the answer is b.atomic theories
Which statement about hydrogen bonds is true?
They are the only force that allows a gecko to climb up glass.
They are the weakest of the intermolecular forces.
They are much stronger than intramolecular forces.
They help water striders walk on water by creating surface tension.
Answer:
The help water striders walk on water by creating surface tension.
Answer:
D)
Explanation:
Trust
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From which parts of the plant cotton and jute are obtained?
Answer:
in cotton is obtained from it's flower part while jute is obtained from it's stem
8.5C (H)
5. An element in the Periodic Table has
three orbitals in its electron cloud and
two electrons in the outer orbital.
What element is this?
A Boron
B Calcium
C Lithium
D Magnesium
Answer:
Boron.
Explanation:
why does water have such a high melting point?
A cube with sides 3cm.Its mass is 54g. will it sink or float
Answer:
It will sink.
Explanation:
Density of water=1gm/cc (In CGS)
Volume of cube=l^3 =3^3= 27cc
Mass of cube =54gm
Density of cube=M/V =54/27 =2gm/cc
Here, density of cube is greater than that of water. So, the cube sinks.
If a sample of gas with pressure 450kPa at 225°C what will its
pressure be at 25°C if the volume does not change?
Answer: 269.3 kPa
Explanation:
Since the volume does not change, the formula: P/T = P/T can be used.
However, all temperatures must first be converted into kelvin, which can be done like this: 225 Celsius + 273 = 498 K; and 25 Celsius + 273 = 298 K.
Now, plug into the formula: 450 / 498 = P / 298 → Cross multiply and divide to get:
P = 269.3 kPa :)
.
2. Bacteria are prokaryotes.
What does this mean?
Explain why as the temperature increases the solubility of solids (increases/decreases).
Answer:
The increased vibration (kinetic energy) of the solute molecules causes them to be less able to hold together, and thus they dissolve more readily.
Why are bacterial DNA gyrase and topoisomerase good targets for antimicrobial drugs?
These enzymes are responsible for host cell recognition, so targeting them would prevent the host cell from being infected.
These enzymes are involved in energy production, so targeting them would prevent the bacteria from obtaining necessary energy.
These enzymes are not necessary for DNA replication.
These enzymes are different from their eukaryotic counterparts, so the drugs targeting them should not affect the host..
Answer:
These enzymes are involved in energy production, so targeting them would prevent the bacteria from obtaining necessary energy.
Explanation:
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Explain all of the conversations of kinetic and potential energy from point A to D.
Can someone help me with 14-16 fill in the blank
Polymers have very __________ molecules. Which word completes the sentence?
Answer:
Large
Explanation:
Polymers have very large molecules called macromolecules
In the extraction of iron, carbon monoxide acts as O A catalyst OB an inert gas . an oxidising agent . a reducing agent .
Answer:
a reducing agent .
Explanation:
In the extraction of iron, carbon monoxide acts as the main reducing agent.
Carbon monoxide is a neutral, colorless and odorless gas. One of the property of carbon monoxide is that it is a powerful reducing agent as it combines with oxygen readily to form CO₂ and hence its use in metallurgy.
A reducing agent is one that undergoes oxidation in a chemical process. The carbon monoxide is produced in the furnace at high temperature. Carbon dioxide combines with carbon to produce carbon monoxide.So, carbon monoxide acts as the main reducing agent.
The molar mass of an element is numerically equal to:.
Answer:
the molar mass of an element is numerically equal to atomic mass in grams-
Which alcohol is used to manufacture formaldehyde? Write it’s names .
Answer:
Acetyldehyde
Explanation:
It's a functional group essential for making alcohol and other products
Methanol (CH₃OH) is used to manufacture formaldehyde.
What is formaldehyde?Formaldehyde can be described as a naturally occurring organic compound with the formula CH₂O and structure H-CHO. Pure Formaldehyde is a pungent, colorless gas that polymerizes spontaneously into paraformaldehyde. Formaldehyde is the simplest of aldehydes (R-CHO).
Formaldehyde is a colorless gas with a pungent, irritating odor. This gas is stable at about 150 °C but it can polymerize when condensed to a liquid.
Formaldehyde can be produced industrially by the oxidation of methanol. The common catalysts are iron(III) oxide, silver metal, iron-molybdenum oxides, or vanadium oxides.
2 CH₃OH + O₂ → 2 CH₂O + 2 H₂O
The silver-based catalyst works at a temperature of about 650 °C. Two chemical reactions on it produce formaldehyde simultaneously:
CH₃OH → CH₂O + H₂
In principle, formaldehyde can be generated by the oxidation of methane, but it is not industrially viable as methanol is more easily oxidized than methane.
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Choose the answer that best describes how Mount Everest and Death Valley differ. Mount Everest is flat, and Death Valley is the highest point on Earth. Mount Everest is the highest point on Earth, and Death Valley is a smaller mountain. Mount Everest is the highest point on Earth, and Death Valley is relatively flat.
Answer:
Mount Everest is the highest point on Earth, and Death Valley is relatively flat.
Explanation:
Death Valley is a desert valley in Eastern California, in the northern Mojave Desert, bordering the Great Basin Desert. It is one of the hottest places on Earth, along with deserts in the Middle East and the Sahara, Mount Everest is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas. The China–Nepal border runs across its summit point.
Answer:
Last one
Explanation:
which is the correct molecular structure for carbon dioxide
=> It is centrosymmetric and linear .
√so in that case carbon dioxide has no electric dipole.Explanation:
The central carbon atom is joined to two oxygen atoms by covalent double bonds
chemical reactions amplify 1.1 pre assessment
Chemical reactions are the various types of permanent changes which occur in substances and which produce new substances .
What are chemical reactions?Chemical reactions are changes which occur in the arrangement of atoms in a substance resulting in the formation of new substances.
There are many types of chemical reactions such as:
combination reactionsdisplacement reactionsdecomposition reactionsoxidation reactionsdouble displacement reactionsThe various types of chemical reactions that occur contribute to the numerous compounds and substance in existence today.
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true or false Cyclic electron transport is different from noncyclic electron transport in that cyclic electron transport produces NADPH
Answer:
true im sorry if im wrong
Explanation:
what is chemicle reaction
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance as distinct from a change in physical form or a nuclear reaction
Explanation:
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Review the mass and size of an atom. A typical hydrogen atom, for example, has
a mass of 1.66 x 102 g. Imagine how big a number we would need to describe
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the number of atoms in a real-life sample of an element. Could we somehow
measure or handle a dozen or a ream of atoms?
Answer:
4moles of Fe reacts =2moles of Fe2O38moles of Fe reacts=x moles of Fe2O3cross multiply4★X=8★2X=16/4X=4Explanation:
4 moles of measure or handle a dozen or a ream of atoms.
What is Hydrogen atoms?An atom of the chemical element hydrogen is known as a hydrogen atom. The Coulomb force holds a single positively charged proton and a single negatively charged electron to the nucleus of the electrically neutral atom.
Isolated hydrogen atoms, often known as "atomic hydrogen," are highly uncommon in normal life on Earth. In contrast, a hydrogen atom usually joins forces with other atoms to form compounds or with another hydrogen atom to generate common (diatomic) hydrogen gas, H2.
In everyday English, the terms "atomic hydrogen" and "hydrogen atom" have similar but distinct meanings. A water molecule, for instance, has two hydrogen atoms but no atomic hydrogen (which would refer to isolated hydrogen atoms).
Therefore, 4 moles of measure or handle a dozen or a ream of atoms.
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