Answer:
Simple distillation
Cream from milk can be separated by
process ......................................
Answer:
centrifugation
Explanation:
why we say the chemical property is a chemical change?
Answer:
In order to identify a chemical property,we look for a chemical change.Chemical changes involve chemical reactions and are often observed through a change in colour or odor
A student made 50g of sodium acetate , 20g of water and 15g of carbon dioxide by reacting baking soda with vinegar. How many total grams of baking soda and vinegar did the student react?
Answer:
Reacting of 5 cm3 of baking soda with 100 cm3 of vinegar should produce 0.083 moles of CO2 gas, 0.083 moles of sodium acetate, and leave 0.01 moles of sodium bicarbonate unreacted.
Explanation:
TIMED CHEMISTRY PLZ HELP How many selenium atoms are in the chemical formula for the compound formed when selenium is combined with lead(II)?
Answer: Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above
Explanation:
10 g of copper is heated and the mass increases to 12.5 g. What is the mass of the copper in the new substances?
Answer:
10g
Explanation:
The amount of copper in the heated mass of the new substance produced is still 10g because in any chemical action, mass is always conserved.
According to the law of conservation of matter "matter is neither created nor destroyed in a chemical reaction". The change in mass is only due to oxygen gas that combines with the new copper formed or other substances that joined the mass. The substance will still have the same amount of copper as the original one. Since we started with 10g of copper, we end with 10g of copper.What do you think makes fireworks different colors?
Answer: different metal salt being heated I believe
Explanation:
The reaction gives off different color for example barium chloride gives a green color
Answer:
They’re created by the use of metal salts. These salts are different from table salt, and in chemistry ‘salt’ refers to any compound that contains metal and non-metal atoms. Some of these compounds produce intense colors when they are burned, which makes them ideal for fireworks.
Explanation:
I WILL GIVE BRANLIEST What factor is a river in an ecosystem? Abiotic or Biotic?
Answer:
River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.
Explanation: it should be both
Answer:
Ecosystems mostly consist of both - abiotic and biotic factors. For that reason the answer which would properly address your question would be A - biotic and abiotic factors. Biotic factors are considered to represent the part of nature that are living and affect other organisms while abiotic factors are things which do not affect other living compounds.
please help.
what is the relationship between period number and the number of occupied energy levels?
Answer:
The number ''n''of a period on the periodic table is the same as the number of the highest principal energy level for the atoms on that row that is, the principal energy level occupied by its valence electrons. Thus, elements on period 1 have a highest principal energy level of 1, and so on.
Geologically, the Himalayan mountain range is one of the youngest mountain ranges on Earth. It has nine of the ten highest peaks in the world. Also, this mountain range is still growing by roughly one centimeter per year.
Which statement BEST explains why the Himalayas are getting taller?
Group of answer choices
Two tectonic plates are colliding.
Lava from volcanic eruptions is building up the peaks.
Surrounding areas are sinking due to weathering and erosion.
Wind deposits sediment that collects and builds up the mountains.
Answer:
Wind deposits I think I remember learning this
Answer:
Two tectonic plates are colliding.
Explanation:
The collision of tectonic plates is what makes mountains.
What is the total number of electrons in mg
Answer:
12 electrons
Explanation:
For the element magnesium, there are 12 electrons. It means that there are 12 electrons in a magnesium atom.
Hope this helped!
PLEASE HELP ME!!! DUE TODAY
k=4 c=2 o=3
I think that is right if it is not this is what I would do go on google and look it up yes it takes a while to get what you want but you are sure it is right I am sorry that I can not do more for you and if this is wrong i am sorry for that too.
Answer:
19. K=8 c=4 o= 12
20. k=2 c=1 o=3
21. n=12 o=30
22. Cl=16 o=8
23. ca=1 c=4 h=6 o=4
24. Na=12 Br=12
25. Na=3 H=3 c=3 o=9
26. Ga=10 Cr=30 o=105
27. fe=8 o=12
28. ba=6 Mn=12 o=48
Which type of bond creates a crystalline structure ?
Answer:
covalent bond
Explanation:
covalent bond is a crystal structure in which the electrons do not leave their orbits.
Answer:true bond
Explanation:
True bond
For her science project, Paula wants to determine if the growth of bacteria in standing rainwater changes over time. She collects rainwater and distributes it evenly in 6 jars and places them all indoors in a spot that does not receive a lot of sunlight to limit evaporation. Using a bacteria testing kit, she measures the bacteria in the water in the first jar on the 5th day, second jar on the 7th day, third jar on the 9th day, fourth jar on the 14th day, fifth jar on the 20th day, and sixth jar on the 24th day. What is the independent or manipulated variable in Paula's experiment?
Answer:
The correct answer is - the number of days the rainwater stands in the jars.
Explanation:
The independent variable or the manipulating variable is a variable in a research or study is the variable which affects the dependent variable or the variable that is going to measure in the study.
In the study, variables that recieves the treatment and changed in every subject are independent variables and in this study number of days the rainwater standing in various jars that might affect the growth of the bacteria in rainwater.
at least three everyday things that exist or occur because of science.
Answer:
1.A POWER DRILL COULD SET YOUR HOUSE ON FIRE, IN THEORY.
2.STICKY NOTES COME OFF EASILY BECAUSE THEIR ADHESIVE IS UNEVEN. ...
3.GUM IS CHEWY BECAUSE IT'S MADE OF RUBBER. ...
4.OFFICE BUILDINGS ARE EVER-SO-SLIGHTLY TALLER AT NIGHT. ...
5.A LEGO BRICK CAN SUPPORT 770 POUNDS OF FORCE. ...
6.POLISHING SHOES IS LIKE FILLING IN A ROAD'S POTHOLES.
Explanation:
Substance A dissociates 100% in water to produce H3O+ ions while substance B dissociates 25% in water to produce OH- ions. What can be determined from this information?
A:Substance A is a strong acid and substance B is a weak base
B:Substance A is a weak acid and substance B is a strong base
C:Substance A is a strong base and substance B is a weak acid
D:Substance A is a weak base and substance B is a strong acid
Answer:
A:Substance A is a strong acid and substance B is a weak base
Explanation:
From this information, we can conclude that substance A is a strong acid and substance B is a weak base.
A strong acid is one that ionizes completely in solution. Most strong acids are usually concentrated. 100% dissociation is a complete ionization.
A weak base ionizes slightly in an aqueous solution. 25% dissociation is weak ionization.
Answer:
a
Explanation:
If 150 G of war started burning 300 G of where as was left behind how many grams of CO2 gas is released
Answer:
geruow0irghvn3p0unhie0ghik
Explanation:
4. In the lab activity Making Connections, an experiment was designed to test the effect of exercise on the ability to squeeze a
clothespin. The number of times the clothespin was squeezed served as the
1. independent variable 2. dependent variable
3. hypothesis
4. control
Answer: dependent variable
Explanation:
The number of times the clothespin was squeezed depends on the amount of exercise performed.
To solve this we must be knowing each and every concept related to dependent variable. Therefore, the number of times the clothespin was squeezed served as the dependent variable. The correct option is option 2.
What is dependent variable?The independent variable influences the dependent variable. The variation in the dependent variable are observed and recorded when the experimenter modifies the independent variable.
In an experiment, the dependent variable refers to the variable which is being measured or assessed. 1 In a research looking at just how tutoring affects test results, for example, the dependent variable might be the participants' exam results because that is what is being examined. The number of times the clothespin was squeezed depends on the amount of exercise performed.
Therefore, the number of times the clothespin was squeezed served as the dependent variable. The correct option is option 2.
To know more about dependent variable, here:
https://brainly.com/question/1479694
#SPJ2
Where in your cells does cellular respiration occur?
Mitochondria
cytoplasm
nucleus
golgi bodies
Answer:
Mitochondria
Explanation:
The enzymatic reactions of the cellular respiration begin in the cytoplasm, but most of the reactions occur in the mitochondria.
Answer:
Cellular respiration is the multi-step process that creates energy from nutrients and food molecules. It begins in the cytoplasm of the cell, with the mitochondria functioning as the main organelle where the rest of the process continues and finishes. During respiration, glycolysis occurs in the cytoplasm of the cell.
Explanation:
anyone help me with these
CORRECT ANSWERS
what does primary succession end with
Someone tell me if I did the equation correctly or not.
Reaction between aqueous Washing soda and lemon juice=
3Na2Co3 + 2C6H8O7 = 2Na3(C6H3O7)+3CO2 (g) + 3H2O(l)
Sodium Carbonate commonly known as Sodium Carbonate is a inorganic compound which used in detergents and to soften the water. Its chemical formula is [tex]Na_{2}CO_{3_[/tex]. It is carbonate base
Lemon Juice:Lemon juice contain citric acid whose chemical formula is [tex]C_{6} H_{8} O_{7}[/tex]. Citric acid is a weak organic acid thus It is used for disinfectants and cleaning as well.
_____________________________________Reaction b/w Washing Soda and Citric AcidWhen Lemon Juice and Washing Soda react, the reaction is just an acid-base reaction and forms trisodium citrate and carbonic acid. The latter is then dissociated into Carbon Dioxide and Water. Carbon Dioxide escapes in the form of bubbles and Sodium Citrate(salt) and Water behind.
(citric acid)+ (sodium carbonate)= (trisodium citrate)+(water)+(carbon dioxide)
OR[tex]2C_{6}H_{8}O_{7} + 3Na_{2}CO_{3} ---> 2Na_{3}(C_{6} H_{3} O_{7})_{2} + 3H_{2}O + 3 CO_{2}[/tex]
_____________________________________Best Regards,'Borz' (Please someone help me it’s urgent) I need to pass this
Here is the electron configuration for Arsenic. What does the superscript 3 in 4pº tell
us?
Ar: 152 252 2p 352 3p6 452 310 4p3
The superscript 3 in 4pº tell that there are 3 electrons in this orbital
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
There are 4 sub-shells in the shell of an atom, namely s, p, d, and f. The maximum number of electrons for each sub-shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub-shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Arsenic is an element with the symbol As, which has an atomic number of 33 and a mass number of 75
Electron configuration of As : [Ar] 3d¹⁰4s²4p³
Each superscript shows the number of electrons that occupy each orbital
For the p orbital there are a maximum of 6 electrons, while the 4p³ orbital shows that there are 3 electrons in this orbital
List the elements that make up the compound copper sulfate
When the following equation is balanced, what is the coefficiant for Br?
___I2 +___NaBr rightwards arrow___NaI +_?_Br2
A.
6
B.
3
C.
1
D.
2
1 points
QUESTION 10
The previous question is an example of what type of chemical reaction?
A.
Synthesis
B.
Decomposition
C.
Single Re-Placement
D.
Double Re-Placement
Answer:
1. A 2. C
Explanation:
because it just is
2. A car travels at 65 miles/hr for 4.5 hours from Houston to Dallas. What is the
distance from Houston to Dallas?
HELP ASAP ILL GIVE YOU 40 POINTS IF YOUR CORRECT!
A teacher wrote the following part of a balanced chemical equation:Cu + 2AgNO3 →To show the conservation of matter in the chemical reaction, how many silver (Ag) atoms will be needed on the right-hand side of the balanced equation?
Answer:
Figure 7.4.1 : Balancing Equations. You cannot change subscripts in a chemical formula to balance a chemical equation; you can change only the coefficients. Changing subscripts changes the ratios of atoms in the molecule and the resulting chemical properties. For example, water (H2O) and hydrogen peroxide (H2O2) are chemically distinct substances. H2O2 decomposes to H2O and O2 gas when it comes in contact with the metal platinum, whereas no such reaction occurs between water and platinum. The subscripts are part of the formulas and once the formulas for the reactants and products are determined, the subscripts may not be changed. The coefficients indicate the number of each substance involved in the reaction and may be changed in order to balance the equation. The equation above indicates that one mole of solid copper is reacting with two moles of aqueous silver nitrate to produce one mole of aqueous copper (II) nitrate and two atoms of solid silver.
Explanation:
Answer: 6
Explanation:
Element Quantity
Copper 1
Silver 2
Nitrogen 1
Oxygen 6
Write a BALANCED chemical equation for the acid base reaction between aqueous perchloric acid and aqueous calcium hydroxide.
Answer:
2HClO4 + Ca(OH)2 = Ca(ClO4)2 + 2H2O
Explanation:
Formula for aqueous perchloric acid is; HClO_4 (aq)
Formula for aqueous calcium hydroxide is; Ca(OH)_2 (aq)
Thus chemical equation is;
HClO4 + Ca(OH)2 = Ca(ClO4)2 + H2O
We have to balance it and so we now have;
2HClO4 + Ca(OH)2 = Ca(ClO4)2 + 2H2O
The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?
Answer:
Fe + H2SO4 Fe2(SO4)3 + H2
Explanation:
its the answer on my answer key
Answer:
C- Fe + H2SO4 Fe2(SO4)3 + H2
Explanation:
The person above me is right. I also just took the test.
Which states of matter are present in this sealed container?
A. solid and gas
B. liquid and gas
C. solid and liquid
D. solid, liquid, and gas
Answer:
C. solid and liquid
I hope this helps!
The element with 5 electrons in its 3d sublevel is...?
Answer:
manganese, Mn
Explanation:
From the question, we have;
The number of electrons in the 3d sub level = 5
The kind of element = d-block element
On the periodic table, the elements with electrons in the 3d-sublevel in increasing order are;
Sc, 3d¹ 4s²
Ti 3d² 4s²
V 3d³ 4s²
Cr 3d⁵ 4s¹
Mn 3d⁵ 4s²
Fe 3d⁶ 4s²
Co 3d⁷ 4s²
Ni 3d⁸ 4s²
Cu 3d¹⁰ 4s¹
Zn 3d¹⁰ 4s²
The elements with 5 electrons in their 3d-sublevel are chromium Cr and manganese, Mn however the electronic configuration of chromium is given as 3d⁵ 4s¹ rather than 3d⁴ 4s² due to the minor difference in the gap of energy between the 3d and the 4s orbital as such the element that has the main characteristic of 5 electrons in its 3d sub level is manganese, Mn.