Answer:
mercury i think
Explanation:
Answer:
Mercury is the densest liquid at standard conditions for temperature and pressure (STP). Also called quicksilver, mercury has been known for more than 3,500 years. It is an important metal in industry, but it is also toxic
Explanation:
in which time period did the first animals that could live both in water and on land appear
(BRAINLIEST AND 50 POINTS) no links
Name one organ system that isn't the Nervous system, Respiratory system, Skeletal system, and Circulatory system, and explain how can that system help keep you safe during a forest fire.
Answer:
Endocrine system
Explanation:
Endocrine system influences the function of the body's hormones via internal glands that are secreted into the circulatory system.
in a forest fire, your endocrine system would trigger the release of adrenaline which is the fight or flight hormone. it would affect your heart rate, metabolism, oxygen intake, and blood flow allowing you to move quicker and escape the fire
Question 5 (Fill-In-The-Blank Worth 2 points)
(03.05 LC)
The number that represents a neutral pH is _______.
Numerical Answers Expected!
Answer for Blank 1:
Question 6(Multiple Choice Worth 2 points)
(03.05 MC)
Which item is made from an acidic ingredient?
Detergent
Soap
Ammonia
Vinegar
Question 7(Multiple Choice Worth 2 points)
(03.05 MC)
Which substances will make a salt when combined?
Vinegar and tea
Soda and wine
Soda and ammonia
Fertilizer and detergent
Question 8(Multiple Choice Worth 2 points)
(03.05 MC)
Which description is not a property of an acid?
pH lower than 7
Turns litmus paper blue
Sour taste
Corrosive
Question 9(Multiple Choice Worth 2 points)
(03.05 MC)
Complete the sentence. When an acid is added to water, hydrogen ions __________.
increase
decrease
stay the same
disappear
Which best describes an element?
a pure substance
a type of a mixture
a pure compound
an impure substance
Answer:
An impure substance
Explanation:
Substance means: hard surface example: salt,corals,coal.
What is gadolinium
And what would be a superpower that relates to it
Answer:
Chemical with symbol Gd on periodic table of elements. It reacts with oxygen.
Fire superpower i guess
Explanation:
Evaluate: (12)2 ×102 −6.3 ÷2.1
21.4 A
22 B
9.3 C
75 D HELP PLS
Answer:
answer is 2,445..or B as its noted
What is the amplitude of the above wave?
Answer:Amplitude in a longitudinal wave
Explanation:Wave amplitude of a longitudinal wave is the distance between particles of the medium where it is compressed by the wave. Wave amplitude is determined by the energy of the disturbance that causes the wave. A wave caused by a disturbance with more energy has greater amplitude.
A Herbig-Haro (HH) object is:_:_________.
a. a small galaxy just outside the outer edge of the Milky Way
b. where a jet from a star in the process of being born collides with (and lights up) a nearby cloud of interstellar matter
c. a part of a giant molecular cloud where molecules containing two hydrogen atoms form
d. a star that has too little mass to start fusion in its core
e. cluster of very low-mass stars, observable only with infrared radiation
Given what we know about Herbig-Haro (HH) objects, we can confirm that they are born from the collision between a jet from a star and clouds of interstellar matter.
What are Herbig-Haro (HH) objects?To put it simply, a Herbig-Haro (HH) object is what we observe as a bright spot in distant space. Upon closer observation we can observe that these giant bright patches are not lone objects, but in fact immense groups of interstellar matter. How Herbig-Haro (HH) objects are formed.The formation of one of these interstellar groups requires an immense amount of energy. This energy come from the speed at which the materials that form these objects collide.As stated in the question, the jet released from a star in the process of being born smashes into a giant cloud of dust and interstellar material to form the Herbig-Haro (HH) objects. This collision happens at hundreds of km/s. To put it into perspective, it would be roughly 500,000 miles per hour.Therefore, we can confirm that option b, which states, "where a jet from a star in the process of being born collides with (and lights up) a nearby cloud of interstellar matter", is the correct choice for the question pertaining to Herbig-Haro (HH) objects.
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How do you prepare 500ml of 1.77M H2SO4 solution from an 18.0M H2SO4 Stock solution
Answer:
Take 49.2-ml of 18.0 M H2SO4 stock solution and pour it into a 500-ml volumetric flask. Fill to the 500-ml line with distilled water to make 1.77M H2SO4 solution.
Explanation:
use the formula M1V1=M2V2
volume must be in liters(L)
[tex](1.77)(500 \times {10}^{ - 3} ) = (18)v2 \\ 0.885 = 18v2 \\ v2 = \frac{0.885}{18} \\ v2 = 0.04916[/tex]
0.04916L × 1000 = 49.16 ml = 49.2 ml
what is the chemical formula of tetraphosphorus heptasulfide?
Answer: P4S7
Explanation:
what is mass tbh pls he;p
Answer:
how much matter is in an object
Explanation:
The molecular formula for a compound with a molar mass of 180.18g that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass is
Answer:
C6H12O6
Explanation:
First you need to find the empirical formula by the percents that they're giving you. You assume that is 100 grams and if for example you have 40% of carbon you will have 40 grams of carbon.
1.Find the number of moles of each atom
C: 40g÷12g/mol= 3.33 mol
H: 6.7g÷1g/mol= 6.7 mol
O: 53.3g÷16g/mol= 3.33 mol
You divide all ratios by the minimum ratio and you obtain the empirical formula
CH2O
Since you're given the molar mass, you now have to find the molar mass of CH2O by adding the molar mass of each element present and repeated in the compound.
CH2O= 30g/mol
Now you know that the molar mass of the molecular formula we are looking for is 180.18 g/mol, and since the empirical formula is the molecular formula in its smaller ratio, by logic you can say that:
180.18g/mol ÷ 30g/mol= 6
So, you now know that the empirical formula is being multiplied by a factor of 6 to reach a compound with a molar mass of 180.18g/mol, so you multiply each subscript of the empirical formula by 6 obtaining:
C6H12O6
3. Explain why the statement "electrons are always located close to the nucleus of an atom" is not really accurate,
Answer:
Electrons are stored in different electron shells with the nucleus in the center. Depending on the size of the element, the electrons may need more shells, making the electrons further away from the nucleus.
Explanation:
Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. the statement "electrons are always located close to the nucleus of an atom" is not really accurate.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.
Electrons always move in fixed orbit around the nucleus with a particular force. Electrons may or may not be close to the nucleus. Depending on the size of the element, the electrons may need more shells, making the electrons further away from the nucleus.
Therefore, the statement "electrons are always located close to the nucleus of an atom" is not really accurate.
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Write the chemical formula for the following ionic compound nickel (III) sulfate 
Answer:
Nickel(III) Sulfate Ni2(SO4)3 Molecular Weight -- EndMemo.
Explanation:
this will explain everything
A calcium atom has 20 protons, 20 electrons, and 20 neutrons. When calcium forms a positive two ion it's new composition is
Answer:
40
Explanation:
I'm not sure
`Carbon Dioxide and Water are the _______ in a chemical reaction. 2. Reactants are also called the starting _______ in a chemical reaction.: Reactants are also called the starting _______ in a chemical reaction. 3. This type of energy comes from the sun: a This type of energy comes from the sun 4. You get this type of energy from food: b You get this type of energy from food 5. The process by which plants use the sun to produce glucose and oxygen.: The process by which plants use the sun to produce glucose and oxygen. 6. The products of photosynthesis: The products of photosynthesis 7. The location of photosynthesis in plant cells: The location of photosynthesis in plant cells 8. Another name for glucose is: Another name for glucose is 9. Energy is provided by this cell organelle during cellular respiration: Energy is provided by this cell organelle during cellular respiration 10. The largest source of energy on earth comes from the: d The largest source of energy on earth comes from the Column B a.Chloroplast b.Ingredients c.Reactants d.Sun e.Radiant energy f.Sugar g.Chemical energy h.Glucose and Oxygen i.Mitochondria j.Photosynthesis
What is the molarity of a 75.0 mL solution that contains 0.225 g of
potassium nitrate?
Answer:
M=0.0297M
Explanation:
we know that molarity equals number of mole of solute over the volume of solution.
M=n/V but n=m/M
n=0.225g÷101g/mol =0.00223mol
M=0.00223mol/0.075l
M=0.0297M
Answer:
0.0297M
Explanation:
We will use the formula M= moles of solute/lites of solution.
First we need to figure out the Moles of the solute, to get this we first need the molar mass of KNO3 (potassimum nitrate).
The Molar Mass of potassimum nitrate is 101.103 g/mol
K - 1 x 39.09
N - 1 x 14.006
O - 3 x 15.999
KNO3 - 101.103 g/mol
Now we get the moles of the solute by doing.
0225g/ 101.103g/mol = 0.00223 mol
Put the answer into the orginal equation to get 0.00223mol / 0.045 L
Which equals to 0.0297M. This is also the correct amount of significant figures.
Based on the graph, what is the approximate half-life of the reaction shown below
Answer: 2.1 minutes
Explanation: Based on the graph, what is the approximate half-life of the reaction shown below
WILL GIVE BRANIEST HELP
Which procedures were followed in this lab to decrease experimental error? Check all that apply.
using only two types of seeds, both from the same source
having one student count every sprout in every quadrat
using adjacent plots of land for both groups
increasing the sample size by combining data from multiple groups
repeating the experiment indoors under growth lights
measuring plant height the same way and at the same time for both groups
Answer:
Basically A, C, D, F
Explanation:
Summarizing the answer
Using only two types of seeds, both from the same source.
What are experimental error?Experimental error refers to the uncertainties or mistakes that can occur during scientific experiments, leading to inaccuracies in the results. These errors can arise due to a variety of reasons, such as human error, instrumental error, environmental factors, and methodological issues. The presence of experimental error can make it difficult to draw accurate conclusions from the data obtained during an experiment.
Scientists use various procedures to reduce experimental error and improve the accuracy and reliability of their results. These procedures can include:
using adjacent plots of land for both groupsincreasing the sample size by combining data from multiple groupsmeasuring plant height the same way and at the same time for both groups.Learn more about experimental error, here:
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How many moles of AgNO3 must react to form 0. 854 mol Ag? mol AgNO3.
The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.
The balanced chemical equation for the dissolution of silver nitrate has been:
[tex]\rm AgNO_3\;\rightarrow\;Ag^+\;+\;NO_3^-[/tex]
The aqueous solution of silver nitrate has been dissociated into the constituent silver and nitrate ions.
In a balanced chemical equation, the coefficient has been equivalent to the moles of each reactant forming the moles of product.
From, the balanced equation,
[tex]\rm 1\;mol\;AgNO_3=1\;mol\;Ag[/tex]
The given moles of Silver has been 0.854 mol. Thus, the moles of silver nitrate required has been given as:
[tex]\rm 1\;mol\;Ag^+=1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;\times\;1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;mol\;AgNO_3[/tex]
The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.
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Earth’s layers are determined by their physical properties and chemical composition. In the lesson, you learned about each of Earth’s layers, what the layers are made of, and why they are important to the Earth. In the space below, write about how the atmosphere may be classified. Would it be part of the lithosphere, or a separate layer? Explain your answer.
Answer:
The Atmosphere Is a separate layer And Also could be classified as the Closest layer
Explanation:
How do covalent compounds differ from ionic compounds?
Answer:
1. Ionic bonds result from transfer of electrons, but covalent bonds are formed by sharing.
2. Ions are arranged in a three-dimensional array (like crystals). Covalently bonded substances exist as discrete molecular units.
3. Ionic compounds often dissociate into ions in solution, but covalently bonded molecules retain their molecular identity in solution.
Hope this helps :)
Why is the molecule not an example of a cis stereoisomer
Answer:
Because in order to have cis or trans configuration both carbon of alkene need to have a hydrogen
How many liters are in 4 moles of a gas at stp?
Answer:
Molar volume at STP can be used to convert from moles to gas volume and from gas volume to moles. The equality of 1 mole = 22.4 L is the basis for the conversion factor.
Explanation:
I need help, plz help me with this problem
Answer:
It's b
Explanation:
I had the same exact question
A student is asked to describe three random
elements found on the periodic table. All three
elements will FOR SURE have which of the two
following characteristics?
A. similar color and texture
B. shininess and value
C. mass and volume
D. similar boiling and freezing points
All three elements in the periodic table will for sure have characteristic of mass and volume.
What is an element?
An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom which is characteristic of it's own. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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 Write the chemical compounds and names for the following ionic compounds. Magnesium and phosphorus 
Answer:
Magnesium is Mg.
Phosphorus is P.
2. Which substance will form a solution with water? (Select all that app
string
sand
sugar
salt
Answer:
sugar and salt, as they can dissolve in water. Sugar and salt have a high solubility in water. So, sugar and salt can form a solution with water.
Explanation:
When a hurricane approaches land, people living directly on the
coast should always evacuate when told to do so by authorities.
Answer:
True
Explanation:
When a hurricane is dangerous enough that authorities say to evacuate, you should for your own safety.
help me please i dont understand
Answer:
1. Dissolving powder in milk - Chemical
- It is chemical because the milk has changed on a molecular level
2. Toasting bread - Chemical
- It is chemical because adding heat to the bread cooks it, therefore
changing it on a molecular level
3. Melting cheese - Physical
- It is physical because the physical appearance was the only change
4. Slicing apples or bannanas - Physical
- It is physical because the physical appearance was the only change
5. Frying an egg - Chemical
- It is chemical because new particles were formed
6. Milk souring - Chemical
- It is chemical because it is forming a new product (lactic acid)
Explanation:
Physical Change occurs when the particles of a substance become rearranged, but do not change into different particles.
Chemical change occurs when a new substance is formed. This process is irreversable.
Answer:
give the preson above brainly bc there right
Explanation: