Answer:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. ... A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Balance this equation (step by step please)
Answer:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
Reactions:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> KNO_{3} + PbCrO_{4}[/tex]
Explanation:
In the reaction, the CrO4(Chromate) is a compound NO3(Nitrate) is a compound as well.
Ignore the number in front of the reaction first, calculate how many K, Cr, O, Pb and N in the equation for both left and right side.
Left side: K=2, Cr=1, Pb=1, N=2, O=10
Right side: K=1, Cr=1, Pb=1, N=1, O=7
So we need 3 more oxygen, 1 more nitrogen and 1 more potassium on the right.
If we add a 2 in front of KNO3, there will be 2 potassium, 2 Nitrogen and 6 oxygen, which the reaction complete.
Conclusion:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
(b) Metal oxides which do not dissolve in water are
called ...
- What is the concentration of hydrogen ions if the pH is 12?
Answer:
1 x 10^-12 mol dm^-3
Explanation:
[H+] = 10 ^ -pH
Therefore, pH 12 = 1 x 10^-12 hydrogen ion concentration
What do you infere about using nonrenweable vs renewable resources and the effect this has on the cost of energy
Answer:
See explanation
Explanation:
Renewable energy resources refers to energy resources that can not be depleted such as wind, solar, biomass etc.
Non-renewable energy resources refers to those energy resources that can be depleted such as fossil fuels.
Globally, it has been established that energy from renewable sources costs less than energy from nonrenewable(especially fossil fuel) sources.
According to Forbes, 2019, "The worldwide weighted average cost of electricity from solar power concentration fell by 26%, that of bioenergy reduced by 14%, solar photovoltaics, geothermal, onshore, as well as offshore wind, fell by 14%, and hydropower by 12%.".
This shows us that renewable energy remains the cheapest alternative in terms of energy cost.
Which of these can be used as an inert electrode?
copper
platinum
silver
zinc
Answer:
I believe it is platinum
Explanation:
I think it is, haha
Answer:
zinc
Explanation:
kwkejnrkewnrkwe
Explain how to count the number of elements in a compound
Answer:
The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.
What is the mass in grams of 5.67 x 1021 molecules of carbon dioxide?
Answer:
5789.07
Explanation:
How many grams are in
.093 liters of o2, gas at STP?
Answer:
0.13 grams of O2
Explanation:
Just did worksheet
plant cells are the only type of cell with a cell wall
true
false
?
Answer:
true
Explanation:
All cells have a cell wall. Plant cells are surrounded by a cell membrane and outside this is a fairly rigid cell wall. The cell wall gives the plant cell a more definite shape than an animal cell. Animal cells do not have a cell wall.
Answer:
True
Explanation:
Animal cells don't have any cell walls while plants do
As Earth orbits the Sun, the seasons slowly change from one to the other. 5 points
Which of the following statements explains the occurrence of summer in
the Northern Hemisphere?
Earth is closest to the Sun in summer.
The Northern Hemisphere is tilted toward the Sun in summer.
The Northern Hemisphere is tilted away from the Sun in summer.
All parts of Earth receive more sunlight in summer.
Answer:
The Northern Hemisphere is tilted toward the Sun in summer is the correct answer.I hope this helps
Explanation:
Day turns into darkness as the Earth spins, and summer turns into winter when the Earth completes its whole cycle. Therefore, the Northern Hemisphere is tilted toward the Sun in summer. The correct option is option B.
What is rotation?The circular motion of an item about its center is referred to as rotation. Things can spin in a variety of ways. When a round, three-dimensional object rotates around an imaginary line inside of its center, it is a relatively common type of rotation. This focal point is known as an axis.
The Earth's rotation and revolution effect wind patterns, temperature, ocean currents, and precipitation, which together determine our local weather and the planet's overall climate. the Northern Hemisphere is tilted toward the Sun in summer.
Therefore, the Northern Hemisphere is tilted toward the Sun in summer. The correct option is option B.
To know more about rotation, here:
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Which statement describes a reaction at 298 K if AH = 31 kJ/mol, AS = 0.093
kJ/(mol-K)?
O A. Gibbs free energy is negative.
B. It is at equilibrium.
C. It is exothermic.
D. It is not spontaneous.
Answer: (D) it is not spontaneous.
Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?
_____ is an example of a heterogeneous mixture.
A)
Tea
B)
Salad
0
Salt
D)
Mayonnaise
B) Salad
heterogeneous mixtures have a non-uniform composition with components in at least two different phases
What are the characteristics of the three states of matter?
Solid:
Liquid:
Gas:
1. organisms of different species that share similar characteristics most likely have..
2. some members of a species are able to withstand very hot weather conditions due to..
Answer:
1. Parents from both species.
2. Because of natural selection.
Explanation:
Please choose the correct sequence that describes the excitement of an atom.
Such an electron transition raises the atom from the ground state to the excited state.
When energy is added to an atom from an outside source, its electrons move to a higher energy level (orbit)
As a result, the atom emits a photon.
When the atom is in an excited state, the electron can drop from the higher energy level to a lower energy level.
A) 2, 1, 4, 3
B) 4, 3, 2, 1
C) 3, 4, 1, 2
D) 1, 2, 3, 4
True or False vacuoles direct cell activities by sending instructions to different parts of an animal cell
Answer:
False
Explanation:
The nucleus controls the cells activities
Hi! I'm going to give brainliest to the person who answers this first/best. It has the answer choices. Thanks!
Answer:
the answer is electron....
PLS HELP DUE IN ONE HOUR The atomic size of atoms increases as you move from top to bottom within a group of
the periodic table. Please explain why the size increases. Limit your response to one
sentence. Use your own words to answer.
Answer:
Within a group trend
Explanation:
The atomic radius of atoms generally increases from top to bottom within a group trend. As the atomic number increases down a group, there is again an increase in the positive nuclear charge. As the atomic number increases within a period, the atomic radius decreases.
Can you please help me !!
Answer:
Explanation:
A) O2 (non polar covalent)
B) HF (polar covalent)
C) NaCl (because its ionic)
im not 100% sure hope it helps
In sweet pea plants, the allele for purple flowers is dominant over the allele for white flowers. If half of the plants in one generation of sweet pea plants has purple flowers, what were the most likely genotypes of the parents?
Explanation:
The genotype for parent is going to be purple flower.
After the crossing is done, we have our p1 to be a purple flower dominant over the the yellow that is to say the parent genotype is going to be a Purple denote a capital P
A first order reaction has a rate
constant of .001 sec-1. What is the
half life in seconds) of this reaction if
the initial concentration is 2.0 M?
-hurry it’s a test
Answer:
one-half
Explanation:
cuz for a first order reaction is a half life independent of concentration and constant over time
Isotopes are atoms of the same element that have different O principal chemical properties, masses. O numbers of protons, O numbers of electrons.
Answer:
Different atomic mass, number of neutrons
Explanation:
Isotopes refer to atoms of the same element, with same atomic number, number of protons & electrons. However, they have different atomic mass, because of different number of neutrons.
The electromagnetic spectrum includes the complete range of electromagnetic waves placed in order of...
Answer: increasing frequency or energy and decreasing wavelength.
Explanation:
Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They can travel in vacuum as well and travel with the speed of light i.e
The electromagnetic spectra consist of radio waves, microwaves, infrared ,Visible , ultraviolet, X rays and gamma rays arranged in order of increasing frequency or increasing energy and decreasing wavelengths.
Which statement correctly compares the sun and planets? A. Planets have an atmosphere; the sun does not. B. Planets gives off energy; the sun does not. C. Planets orbit the sun; the sun is at the center of the solar system. D. Planets are all made of solid materials; the sun is made of gases.
Answer:
c
Explanation:
because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here
The sun and the planets are part of the solar system. The sun is in the center of the system, and the planets revolve around it. Thus, option C is correct.
What is the solar system?A solar system is a part of the Milky Way galaxy that includes the planets, stars, sun, moon, asteroids, etc. The Sun is the star that is fixed at the center of the system.
The planets are not fixed and revolve in orbit around the sun and rotate on their axis. The sun and planets are made up of gases and have different atmospheres.
Therefore, option C. sun is at the center around which the planets revolve.
Learn more about the sun and planets here:
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Vectors are arrows that tell us two things about force...WEIGHT and DIRECTION
True
False
I put 5 pigs, 2 goats, and 7 horses in a boat with six cats. How many dogs are in that one Disney movie with all the dogs?
Answer:
the average weight of a frog is 0.8 ounces, so your answer would be 4
Answer:
one hundred and one
Explanation:
Which objects should not be thrown in landfills because they could leach into groundwater and pollute the water?
A. paints
B. aluminum foil
C. plastics
D. paper
What is a unwanted change in the environment caused by substances or from of energy??
Answer:
pollution I think
Explanation:
(URGENT) will mark brainliest if you help me answer this
Question 1 options:
OH-
H+
Question 2 options:
OH-
H+
Question 3 options:
soap
bleach
apple juice
ammonia
Question 4 options:
lemon juice
bleach
milk
stomach acid
Question 5 options:
0-3
8-10
0-6
8-14
Question 6 options:
0-3
8-10
0-6
8-14
Question 7 options:
sour
bitter
sweet
salty
Question 8 options:
slippery
brittle
malleable
corrosive
Question 9 options:
slippery
brittle
malleable
corrosive
Question 10 options:
sour
bitter
sweet
salty
Answer:
For Q1: H+
For Q2: OH-
for Q3: Apple juice
For Q4: bleach
For Q5: 0-6
For Q6: 8-14
For Q7: Sour
For Q8: Corrosive
For Q9: Slippery
for Q10: Bitter
Explanation: