Answer:
it's a chemical change
Explanation:
When two different chemical substances are mixed they are no longer the same and can not be changed back so therefore it's a Chemical reaction.
How many moles of Hg are in a thermometer that contains 0.055 mL of Hg?
Answer:
745.8
Explanation:
Answer:
745.8
Explanation:
I hope this helps, and correct I mostly guaranteed is correct.
Which of these can be combined to make a mixture?
a. solid and a liquid
b. two solids
c. two liquids
Answer:
c
Explanation:
you cant mix a rock and a rock together and expect to get a mixture
and you cant mix a rock and water and expect them to mix
so its on logical that it is two liquids
The image shows a projection map.
Which type of map is this?
flat model, Mercator projection
flat model, conic projection
highly distorted model, Mercator projection
highly distorted model, conic projection
Answer:
A. flat model, Mercator projection
Explanation:
I just took the test :]
Which of the following is a metal?
A. nitrogen
B. calcium
C. sulfur
D. carbon
Answer: Calcium
Explanation: The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust. The metal is trimorphic, harder than sodium, but softer than aluminium.
Hope this helps. pls mark me brainliest :)
What type of cell division is responsible for the formation of the heart, brain and lung cells from the fertilized egg?
Answer:
It must be sex cells
A spring-fed stream forms a pond that contains watercress plants, minnows, and crayfish. The pond receives 5 hours of direct sunlight every day. Which of the following is an abiotic factor in this ecosystem?
the pond water
the watercress plants
the minnows
the crayfish
Answer:
The pond water
The most useful property of metalloids is their _____.
A. stored energy which is released through combustion
B. being non-reactive with other elements
C. value when used to make precious jewelry
D. varying ability to conduct electricity
Answer:
DDDDDDDDDDDDDDDDDDExplanation:
i just answer this it's corect trust meeeWhich of the following pH values represents a strong acid?
1
8
13
7
Answer:
1
Explanation:
acid is 0-3 lower numbers
Directions:
Read the article and then answer the questions. Consider answering these questions please. The questions are on the pdf attached to this question.
Answer:
1.
a) F; Insulator
b) F; are always moving
c) T, T, T
d) T, T, T
2. b; firm and not readily movable
3. a; occupied
4.
Temperature: =
Thermal energy: <
sentences: 14, 15
5. cool
sentence: 21
6. radiation; the heat from the heating coil is radiated to the cake and causes it to rise
(though if you really want to sound smart you can explain how all of them are used) (radiation: heating coil; convection: hot air circulating in the oven; conduction: cake pan to cake)
7. conduction; the heat from oatmeal is transferred to the bowl through contact
8. convection; the air is circulated due to uneven heating (of the earth by the sun)
9. (rephrase this answer in your own words)
jacket: Insulator; prevents heat loss from the cold outside airsleeping bag: insulator; keeps me warm at night while it is cold outside of itcooking pans: conductor; heat from the flame (of a stove) is transferred to the pan to cook food; it would be very inefficient to use an insulator for something that needs to transfer heat(metal) tent stakes: get cold fairly quickly in the cold air, if they were insulators then they would not change in temperature so quickly
10. as the wax melts and turns to liquid the particles drastically speed up to the point where they begin to flow around each other
Answer:
1.
a) F; Insulator
b) F; are always moving
c) T, T, T
d) T, T, T
2. b; firm and not readily movable
3. a; occupied
4.
Temperature: =
Thermal energy: <
sentences: 14, 15
5. cool
sentence: 21
6. radiation; the heat from the heating coil is radiated to the cake and causes it to rise
(though if you really want to sound smart you can explain how all of them are used) (radiation: heating coil; convection: hot air circulating in the oven; conduction: cake pan to cake)
7. conduction; the heat from oatmeal is transferred to the bowl through contact
8. convection; the air is circulated due to uneven heating (of the earth by the sun)
9. (rephrase this answer in your own words)
jacket: Insulator; prevents heat loss from the cold outside air
sleeping bag: insulator; keeps me warm at night while it is cold outside of it
cooking pans: conductor; heat from the flame (of a stove) is transferred to the pan to cook food; it would be very inefficient to use an insulator for something that needs to transfer heat
(metal) tent stakes: get cold fairly quickly in the cold air, if they were insulators then they would not change in temperature so quickly
10. as the wax melts and turns to liquid the particles drastically speed up to the point where they begin to flow around each other
Explanation:
I hope this helps
Which layer of the ocean is the least dense?
1. middle layer
2. closest to the ocean floor
3. they are all the same
4. closest to the surface
Answer:
closest to the ocean floor
Explanation:
the ocean floor contains more salt then the surface of the ocean
Hurry HELP 20 pts 5 ⭐ and a THANKS
Scenario:Fossils show that many species, or kinds of organisms, have died out or become extinct because they could not respond to the pressures fast enough to survive. Those that did survive were better suited to their environment. Evidence shows that new species develop from old species as a result of gradual change. Natural selection is one process by which organisms change over time. Evidence shows that species change over time, sometimes giving rise to new species.External DataPrompt:Look at the pictures above that show how the giraffe got such a long neck. Write a scientific explanation of how natural selection applies to this process.
Claim:____________________________________________
Evidence:______________________________________________
Reasoning:_______________________________________________
Rebuttal:_____________________________________________________
Answer:
The claim would be that evident show species over time
evidence is a look at the picture above show how the graffiti got such a long neck
reasoning how fast you're so that many kind of specimens
Richard boodle those that did survive were better suited
Which of the following is a problem caused by acid rain?
respiratory problems in humans
is a factor in global warming
makes lakes and streams unsuitable aquatic life
Answer:
Air pollution like sulfur dioxide and nitrogen oxides can cause respiratory diseases, or can make these diseases worse. Respiratory diseases like asthma or chronic bronchitis make it hard for people to breathe.
Answer:
1st one
Explanation:
mark brainliest please
What is one advantage of developing energy-efficient technologies?
Answer:
it's simple
Explanation:
For residential buildings, a whole-house approach using a cost-effectiveness criterion can result in savings of 50 percent or more in heating and cooling and 30–40 percent reductions in total energy use.
I hope you understand have a great day :3
PLEASE HELP MEEEE THIS IS ABOUT BODY SYSTEMS
I would appreciate your help! Due today! ( I don't know if this is even chemistry)
Answer:
6+69
Explanation:
Which is not true of the element nitrogen?
A. There is more nitrogen gas in the air than oxygen.
B. Nitrogen atoms form diatomic molecules.
C. Nitrogen in the air is highly reactive.
D. Nitrogen is used as a fertilizer for soil.
A Rock is determined to be 1.426 billion years old. How much uranium -235 remains in the rock?
Answer:3.5930 million
Explanation:
**URGENT!!*** Compare lithium (Li) in group Ia (1) to fluorine (F) is in group VIIa (17). Does each element want to give or take electrons? Are these two elements likely to bond with each other? Select all that apply. *
Li wants to take 1 electron
No, they would not bond with each other
Li wants to give 1 electron
Yes, they would bond with each other
F wants to give 1 electron
F wants to take 1 electron
Answer:
Li wants to give 1 electron and fluorine wants to take 1 electron. also they will bond with each other!!
What is density?
1. a measure of salinity
2. the weight of water
3. the amount per unit volume of a particular material
4. the amount of salt in water
PLEEASEE HELP ITS PAST DUE AND IM GIVING BRAINLIEST
Which process is an example of a physical change?
a. wood burning in a camp fire
b. iron rusting on a bicycle chain
c. ice melting after a snow storm
d. milk souring because it is old
Answer:
c or d
Explanation:
i dont know which one but it's one of those
How does the water in an estuary compare to the water in the open ocean?
Estuaries have less concentrated nutrients and salt.
Estuaries have more concentrated nutrients and salt.
Estuaries have less concentrated nutrients and more concentrated salt.
Estuaries have more concentrated nutrients and less concentrated salt.
Answer:
Estuaries have more concentrated nutrients and less concentrated salt.
Which of these is most likely to happen to a grassland ecosystem after a catastrophic flood?
Birds will compete for water.
Amphibious snakes will compete for space.
Flying insects will have to find new sources of food.
Ground-dwelling rodents will have to find new shelter.
Answer:
ground-dwelling rodents will have to find new shelter
After a catastrophic flood in a grassland ecosystem , ground-dwelling rodents will have to find new shelter.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/1673533
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DOES ANYONE ELS FIN SNUFFLEUPAGUS CREEPY CAUSE I DO.....
Answer:
BROO.... YESSS
Explanation:
Answer:
Yes
Explanation:
They just creep me out
Why are lysosomes important?
When a cell is beyond repair, lysosomes help it to self-destruct in a process called apoptosis.
Answer: A lysosome is a membrane-bound cell organelle that contains digestive enzymes soooo. They break down excess or worn out cell parts, they may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.
Explanation: So that's why it is important
Saundra experimented with making solutions from water and a powdered drink mix. She measured the powder in tablespoons (T) and the water in milliliters (mL). She observed the color and taste of each solution and recorded her data in the table below.
Water (mL) Powder (T) Taste Color
100 mL 1 weak
100 mL 2 normal
100 mL 3 strong
100 mL 4 very strong
According to Saundra's table, how did she make her solution more concentrated?
Answer:
To Much powder
Explanation:
PLs GIVe Me BRAINLIESt!!!
Answer:
Less water
Explanation:
Because stuff at the store says conscentared its usally dry and thats means there is less or no water
Why do you think it’s useful for scientists to classify matter? In other words, why do you think scientists need to identify something as a pure substance? Why do you think they need to know if something is a compound or an element?
Answer:
They need to know
Explanation:
Because if we didn't know that something was a compound of an element we could either blow ourselves up when we are mixing them or when we are looking for something bad between the compound and we don't know its a compound how do we fix it
Classifying substances as elements or compounds helps us to understand their properties.
Matter is anything that has mass and occupy space. There are several substances in the universe and all of them are composed of matter. It is necessary to classify matter for reference purposes. When we classify matter then it is possible to refer to substances under specific classes.
A pure substance contains only one kind of matter. It is necessary to classify something as a pure substance so that it is we can know if it contains one type of matter or different types of matter.
It is necessary for scientists to classify something as element or compound in order to understand its properties. Elements and compounds are pure substances.
Learn more: https://brainly.com/question/13516179
How many outer electrons does a noble gas like Neon or Xenon have? Does this mean it is highly reactive, somewhat reactive, or non-reactive? *
8, non-reactive
1, highly reactive
4, somewhat reactive
4, highly reactive
1, somewhat reactive
1, non-reactive
8, highly reactive
8, somewhat reactive
4, non-reactive
How can human use of natural resources pollute the environment? :(
Answer:
If a human does an non ecofriendly thing such as litering, it can damage earths atmosphere
Explanation:
i duno
Answer:
Humans impact the environment in several ways. Common effects include decreased water quality, increased pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.
Explanation:
hope it helps:)
Which is a metal alloy?
A. lead
B. gold
C. stainless steel
D. copper
Answer:
C
Explanation:
Steel is an alloy of iron and carbon.
Which elements do not normally form compounds?
A. nonmetals
B. alkali metals
C. metalloids
D. noble gases
Answer:
D. noble gases
Explanation:
l hope it helps