Answers
Answer:
In science class me and my brother had a stem fair project where we had to find out the independent variable of our project
When water becomes ice it becomes a dependant variable
Explanation:
Related Questions
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
Answers
Answer:
The answer is Third one
which is the correct molecular structure for carbon dioxide
Answers
=> 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
why does water have such a high melting point?
Answers
hello people ~
From which parts of the plant cotton and jute are obtained?
Answers
Answer:
in cotton is obtained from it's flower part while jute is obtained from it's stem
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
Answers
Answer:
molcule
Explanation:
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?
Answers
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 :)
what is chemicle reaction
Answers
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:
please mark brainlest
How do invertebrates affect the oxygen levels of compost and soil?.
Answers
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
URGENT  Please I need help answering these two questions ASAP
Answers
true or false Cyclic electron transport is different from noncyclic electron transport in that cyclic electron transport produces NADPH
Answers
Answer:
true im sorry if im wrong
Explanation:
Can someone help me with 14-16 fill in the blank
Answers
15.inference
16-invention
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
Х
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?
Answers
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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In the extraction of iron, carbon monoxide acts as O A catalyst OB an inert gas . an oxidising agent . a reducing agent .
Answers
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.
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
Answers
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 molar mass of an element is numerically equal to:.
Answers
Answer:
the molar mass of an element is numerically equal to atomic mass in grams-
What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties. b. There must be a change in physical properties. c. The change must involve a change in mass. d. The change must involve a change in volume. Please select the best answer from the choices provided A B C D Mark this and return
Answers
Answer:
A. There must be a change in chemical properties.
At least 2 or 3 atoms must change for it to be considered chemical. There must be some type of reactants that will change this. Otherwise, it's not a chemical reaction.
Hope this helps!
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.
Answers
Answer:
The help water striders walk on water by creating surface tension.
Answer:
D)
Explanation:
Trust
In paragraph 2, attraction and repulsion refer to _____.
A electric and magnetic fields
B atomic theories
C tiny particles
D solid atoms
Answers
Answer:
I guess the answer is b.atomic theories
PLEASE ANSWER NOW!!!
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?
Answers
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:
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..
Answers
Answer:
These enzymes are involved in energy production, so targeting them would prevent the bacteria from obtaining necessary energy.
Explanation:
hope this helps
Explain why as the temperature increases the solubility of solids (increases/decreases).
Answers
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.
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
Answers
Answer:
Boron.
Explanation:
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.
Answers
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:
Polymers have very __________ molecules. Which word completes the sentence?
Answers
Answer:
Large
Explanation:
Polymers have very large molecules called macromolecules
A cube with sides 3cm.Its mass is 54g. will it sink or float
Answers
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.
Explain all of the conversations of kinetic and potential energy from point A to D.
Answers
Potential energy (PE)= mass• gravitational acceleration • hight
KE depends on the velocity and PE on the hight.
The picture is not clear so I will assume that at point (A) the velocity = 0
So there is no KE , all the energy in the PE form
At point (B), the hight is not = 0 so there is PE. Also the object will have a velocity so there is KE
Similarly with c and d
Hope this helps.
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
Answers
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).
.
2. Bacteria are prokaryotes.
What does this mean?
Answers
Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure. no
What is the vertex of the parabola in the graph?
1
19
6
4
2
X
-6
-2
-2
-4
Answers
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.
Which alcohol is used to manufacture formaldehyde? Write it’s names .
Answers
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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