What happens when Magnesium hydroxide is heated? (Decomposition)
Answer:
It will make magnesium oxide and water
Explanation:
What is Density in chemistry
Answer:
The density of something is the connection between the mass of the substance and how much space it takes up
Silver nitride is formed when a silver cation that has a 1+ charge combines with a nitrogen anion that has a 3- charge. Write the formula for the compound silver nitride.
A sample of water has a mass of 193 g. Salt is added to the water, and the final solution weighs 238 g. How much salt was added? Please help no rush needed but this is due today but no rush..........Thank you so much.
Answer:
45 g of salt was added
Explanation:
238g-193g=45g
What os the formula for hexaboron tetrabromide
Answer:
B6Br4
Explanation:
Chemical formula gives a representation of the number of atoms that each element in a compound or molecule. In this question which is asking to give the formula of hexaboron tetrabromide, the hexa means 6 while the tetra means four.
Since the number of atoms of each element is written as a prefix before the main element, this means that the chemical formula of hexaboron tetrabromide will be B6Br4.
Please answer!!! Will give brainliest to best answer!!
1. What is the difference between magma and lava?
2. Under what circumstances do large crystals form from a cooling magma?
3. Under what circumstances do small crystals form from a cooling magma?
4. What happens to the mineral particles in salt water when the water evaporates?
5. Explain how halite forms.
6. Explain how mineral veins form.
Answer:
I can answer 1, lqva is magma outside of the volcano
When hydrogen reacts with calcium metal, what are the oxidation numbers of the calcium and hydrogen in the CaH2 product?
Ca(s)+ H2(g) → CaH2
a. +2 and -1
b. +1 and -2
c. +2 and 2
d. 0 and 0
e. -2 and +1
Answer: e. -2 and +1
Explanation:
Oxidation number or oxidation state : It represent the number of electrons lost or gained by the atoms of an element in a compound.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation number of the substance increases.
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation number of the substance gets reduced.
[tex]Ca(s)+H_2(g)\rightarrow CaH_2[/tex]
The oxidation number of calcium (Ca) in free state is 0 and in [tex]CaH_2[/tex] , it is -2.
The oxidation number of hydrogen in [tex]H_2[/tex] is zero and oxidation number of hydrogen in [tex]CaH_2[/tex] is +1 as in hydrides hydrogen loses electrons.
The oxidation number of calcium has been +2, and the oxidation number of hydrogen has been -1. Thus, the correct option is A.
The oxidation number can be defined as the number of electrons that have been lost by an atom in a chemical reaction.
The oxidation number can be calculated as the:
The oxidation number of Hydrogen when it combines with the less electronegative element has been -1.
There have been 2 atoms of Hydrogen that lose an electron, thus the total oxidation contribution of hydrogen has been -2.
The oxidation number of hydrogen has been -1.
The oxidation number of Calcium has been:
Ca atom has taken an electron from the hydrogen.
[tex]\rm Ca\;+\;e^-\;\rightarrow\;Ca^-[/tex]
The calcium takes one electron from each atom bonded. Thus the oxidation number of calcium has been +2.
The oxidation number of calcium has been +2, and the oxidation number of hydrogen has been -1. Thus, the correct option is A.
For more information about oxidation numbers, refer to the link:
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How many milliliters of 0.128 M nitric acid are required to neutralize 11.1 mL of 0.184 M sodium hydroxide? Answer with the correct number of significant digits.
Answer:
I think 7.72 mL
11.1/184 × 128/184=7.72
Describe what happens in the cell before the chemical reaction.
___________________________________________________________
Answer:
Chemical reactions that take place inside living things are called biochemical reactions. The sum of all the biochemical reactions in an organism is referred to as metabolism. Metabolism includes both exothermic (heat-releasing) chemical reactions and endothermic (heat-absorbing) chemical reactions.
___________________________________________________________
_______ are white blood cells that recognize specific antigens, and ultimately destroy them.
O lymphocytes
O pathogens
O water
Answer:
Lymphocytes
Explanation:
Pathogens are particles that make you sick like bacteria, viruses, amoebas. Water is essential for life but that's for metabolism, not fighting off against infection or viruses.
Answer:
Lymphocytes
Explanation:
lymphocytes are a kind of white blood cell (WBC). Lymphocytes are cells of the immune system and help fight infection. Lymphocytes live in lymph nodes, but also in the bloodstream and all over the body. Lymphocytes come in two main types: B-cells and T-cells
Where as water is totally not white blood cells and pathogens are viruses and bacterium
what are evidence that a chemical change has occurred
Answer:
Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.
Formation of a Precipitate.
Color Change.
Temperature Change.
Production of Light.
Volume Change.
Change in Smell or Taste.
24. H.SO, has
a) Ionic bond
b) both lonic and covalent bonds
c) ionic covalent and coordinate bonds
d) covalent bond
Answer:
b
Explanation:
Both ionic and covalent bonds when it has dissolved into water it will become ionic compound but when it was in gas situation it was covalent compound.
When a living organism is successful in meeting all its needs ,this is called
A.active transport
B.endocytosis
C.homeostasis
D.exocytosis
Answer:
homeostasis
Explanation:
source Wiki
In biology, homeostasis (or “health”) is the state of steady internal, physical, and chemical conditions maintained by living systems. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits (homeostatic range). Other variables include the pH of extracellular fluid, the concentrations of sodium, potassium and calcium ions, as well as that of the blood sugar level, and these need to be regulated despite changes in the environment, diet, or level of activity. Each of these variables is controlled by one or more regulators or homeostatic mechanisms, which together maintain life.
a.liver e.mouth i.stomach
b.colon f.pancreas
j.large intestine c.gallbladder
g.tongue k.villi d.esophagus
h.peristalsis l.teeth
_8. stores a substance called bile, which physically breaks down fat droplets
_9. Digestion begins when salivary gland secretions enter this
_10. Minute projection extending from the walls of the small intestine and involved in absorbing products of digestion
_11. used to cut, tear, and grind food; adult has 32
_12. when you swallow food, muscular movements carry the food along this structure
to the stomach
13. this organ absorbs excess water form undigested food prior to its release from
the body as a solid waste
_14. Muscular movement involving the walls of the digestive tract that serve to mix materials and move them along the tract
15. it pushes food to the back of the mouth prior to swallowing
_16. this organ produces bile and detoxifies a variety of substances
_17. produces digestive juices that are released into the small intestine
_18. another name for the large intestine
19. functions include mixing food and serving as a reservoir prior to the food being passed on to the small intestine
Answer:
8. c
9. e
10. k
11. L
12. d
13. j
14. h
15. g
16. a
17. F
18. b
19. i
Explanation:
The gallbladder stores a substance called bile, which physically breaks down fat droplets, hence the correct options are 8. C, 9. E, 10. K, 11. L, 12. D, 13. J, 14. H, 15. G, 16. A, 17. F, 18. B, 19. I.
What are the components of the digestive system?Digestion begins when salivary gland secretions enter the mouth. Teeth used to cut, tear, and grind food; adult has 32.
Villi are a minute projection extending from the walls of the small intestine and involved in absorbing products of digestion.
When you swallow food, muscular movements carry the food along the esophagus to the stomach. The large intestine absorbs excess water from undigested food prior to its release from the body as a solid waste.
Muscular movement known as peristalsis involving the walls of the digestive tract that serve to mix materials and move them along the tract.
Therefore, the correct options are 8. C, 9. E, 10. K, 11. L, 12. D, 13. J, 14. H, 15. G, 16. A, 17. F, 18. B, 19. I.
Learn more about digestive system, here:
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What happened to the celery if you put in food color water
Answer:
the celery would change colour!
Explanation:
Which of the following is a chemical property?
O volume
O flammability
O color
O weight
Answer:
your answer is flammability
37. Using the reaction of nitrogen gas and hydrogen gas to make ammonia gas
(NH3), if you have 7 L of nitrogen, and all the hydrogen you need, how many
liters of ammonia gas can you make?
You can make 14 L of Ammonia
Further explanationAvogadro's hypothesis:
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
[tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]
Reaction
N₂+3H₂⇒2NH₃
Volume of Nitrogen-N₂ : V₁=7 L
From the equation above, mol ratio of N₂ : NH₃ =1 : 2, so volume of NH₃ :
[tex]\tt \dfrac{7}{1}=\dfrac{V_2}{2}\\\\V_2=\boxed{\bold{14~L}}[/tex]
The pH scale for acids and bases ranges from
A. 17
B. 0-14
C. 1-14
D. 1-12
Answer: 0-14
Explanation: Hope this helps
Photosynthesis makes (__________) and (____________) for an ecosystem.
Answer:
Oxygen and Sugar (Glucose).
Explanation:
Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.
what is 1.602176*10-¹⁹/ 1.758820*10¹¹C kg-¹
with proper explanation.
or expanded form
Answer:
0.00000000910938;
9.109380 * 10^-9
Explanation:
Given the question :
Given :
1.602176*10-¹⁹/ 1.758820*10¹¹
The numbers are expressed in the form:
A * 10^b ; Where;
A = Coefficient ; 10 = base ; b = exponent
The Coefficients can be divided directly as :
1.602176 / 1.758820 = 0.9109380
Using the division law of indices, the exponents acn be worked out as follows since they have the same base :
10^-19 / 10^-11 = 10^(-19 - (-11)) = 10^(-19+11) = 10^-8
Thus, we have ;
0.9109380 × 10^-8
In standard form:
9.109380 * 10^-9
In Expanded form:
10^-8 = 0.00000001
0.9109380 * 0.00000001 = 0.00000000910938
0.000000009 +
0.0000000001 +
0.00000000000 +
0.000000000009 +
0.0000000000003 +
0.00000000000008
__________________
0.00000000910938
___________________
Which of the following factors affect the rate of weathering in an area?
A.
climate
B.
topography
C.
rock composition
D.
all of the above
Answer:
D
Explanation:
pretty sure D
100 points PLEASEEE HELP ASAPPPP PLEASE Identify the kinds of bonds present between/among the given atoms/elements:
Sodium (Na) and Chlorine (Cl) _____________
Oxygen( O) and Oxygen ( O) ______
Sulfur ( S) and Oxygen ( O) ______
Nitrogen (N) and Nitrogen ( N) ________
Aluminum (Al ) and Bromine ( Br) ______
Answer:
20, 50, 25
Explanation:
I just figured it out somehow in my brain.
121
P(1)(1 + i)
1 + 11) 121 - 1
M = (1 + )
Answer:
121
Explanation:
add 1+120 to get answer
Which elements are diatomic?
1
H
3
Li
6
с
7
N
8
0
9
F
5
B
13
AI
2
He
10
Ne
18
Ar
15
P
16
S
17
CI
11
Na
19
K
4.
Be
12
Mg
20
Ca
38
Sr
31
Ga
33
As
35
Br
36
Kr
34
Se
52
Te
14
Si
32
Ge
50
Sn
82
Pb
114
FI
51
Sb
53
1
37
Rb
55
Cs
54
Xe
E
86
49
In
81
TI
113
Nh
56
Ba
83
Ві
84
Po
85
At
Rn
87
Fr
88
Ra
115
Mc
116
Lv
118
117
Ts
Og
Diatomic elements have to atoms of the element in a molecule.
What are diatomic elements?Diatomic elements are those elements whose atoms combine together to form molecules of the element. The elements that are diatomic in the list are;
HNOFClBrSeTeHence, diatomic elements have to atoms of the element in a molecule.
Learn more about diatomic molecules: https://brainly.com/question/4979095
What is weathering?
A.
the process by which sediment is compacted into rock
B.
the process by which rocks are broken down into sediment
C.
the process by which sediment is transported from one place to another
D.
the process by which sediment is deposited and built up into landforms
Answer:
B.
the process by which rocks are broken down into sediment
if you start with 362 grams of C3 H8 how many grams of H2O will be produced
Answer:
52 g H2O (to 2 significant figures)
Explanation:
I hope you like my answer:)
Can you mark me as brainliest please
When a mixture of rock pieces, salt and water is filtered, what will be found as the filtrate and what will be found as the residue
Answer:
Filtrate: Mixture of salt and water.
Residue: rock pieces
Answer:
Salt solution will be the filtrate
and the rock pieces will be the residue.
Explanation:
This is because salt is soluble in water and hence
it cannot be filtered out of water giving as a salt solution as the filtrate and since the rock pieces are not soluble in water they are left out and they become the residue.
Oxidation of a secondary alcohol results in the formation of a(n):________. a) tertiary alcohol b) acid c) aldehyde d) ketone
Answer:
A. Tertiary alcohol
Explanation:
Secondary alcohols are oxidized to ketones - and that's it. For example, if you heat the secondary alcohol propan-2-ol with sodium or potassium dichromate(VI) solution acidified with dilute Sulphuric acid, you get propanone formed. Playing around with the reaction conditions makes no difference whatsoever to the product.
PLS HELP ASAP 50 POINTS
The two main factors keep a planet in motion are what and what?
Answer:
Gravity, Inertia, and Velocity ( I decided to use three)
Explanation:
Gravity is the primary force that controls orbit and gravity works with inertia along with velocity.
Gravity, Inertia, and Velocity ( I decided to use three)
Explanation:
Gravity is the primary force that controls orbit and gravity works with inertia along with velocity.
A student walks 15 km in 3 hours. What is the student’s average speed?
A :45 km/h
B :5 km/h
12 : km/h
18 : km/h
Answer:
5 km/h
Explanation:
divide the hours to the distance