Which of the following are observations? Select all that apply.
A. Watching table salt dissolve in water.
B. Feeling the sensation of ice held in the hand.
C. Smelling ammonia used in a cleaning solution.
D. Hearing a loud bang when a balloon filled with hydrogen gas is ignited.
E. Looking at the readout of a digital scale when measuring reagents for an experiment.

Answers

Answer 1

Answer:

All are correct

Explanation:


Related Questions

Electronic configuration of 11N

Answers

Answer:

The Electronic configuration of 11N is

[Ne]3s1

a pencil is 7 in Long what is its length in centimeters

Answers

look the following picture i think that will help you too find out answer

Which particles are found in an atom have charges

Answers

Atomic particles Because the usually have a chain reaction when blown up

Answer:

protons and electrons

Explanation:

protons are positivley charged

electrons are negetively charged

but neutrons have no charge

The Sun-Earth-Moon system can be modeled by using three balls. Which
statement describes a benefit of this model?
O A. It can be easily manipulated to represent changes that occur
slowly.
O B. All parts of the entire solar system can be modeled in the same
way.
O C. The model shows only how moon phases happen.
O D. The actual Sun-Earth-Moon system moves too quickly to be
studied directly.

Answers

Answer:

A. it can be easily manipulated to represent changes that occur slowly.

A black compound reacts with acid to give a blue green solution. Name the compound. Write the reaction​

Answers

Answer:

compound is CuO.

Explanation:

rxn:

CuO + 2HCl = CuCl2 (Blue green color) + H2O

Why would early Earth have been toxic for modern day animals? Why were cyanobacteria able to
survive

Answers

Answer: The surface of early earth was mostly molten and volcanic. The atmosphere was hot and highly toxic.

Explanation: Photosynthetic organisms were present when earth was primarily anoxic. photosynthetic organisms were present when earth was primarily anoxic. the early forms of photosynthesis did not produce oxygen as a waste product. cyanobacteria carry out anoxic photosynthesis. the early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere. the early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere.

1

Early earth have been toxic for modern day animals as at that time atmosphere is oxygen free, and cyanobacteris is able to survive due to symbiosis.

What are cyanobacterias?

Cyanobacteria is a group of microorganisms that are related to bacteria but can perform photosynthesis. They are prokaryotic and are thought to be the earliest form of life on the planet.

Early earth atmosphere may proof toxic for modern day animals because at the earliest time, atmosphere is oxygen free means no oxygen is present in the atmosphere. And in the today scenario we can't imagine life without oxygen.

Cyanobacteria were able to suvive in that early atmosphere through alternative option like symbiosis in which a cell merges with another cell in order to the survival of both cells.

Hence life is toxic at the early time because of the absence of oxygen.

To know more about cyanobacteria, visit the below link:
https://brainly.com/question/1516890

#SPJ2

Constants (“controlled variables”) and a control are easily confused by students! How would you explain the difference between the two words?

Answers

Answer:

Please find the explained difference below

Explanation:

In a scientific experiment, the CONTROLLED VARIABLE, also known as CONSTANT, is the the variable that is kept unchanged by the experimenter throughout the course of the experiment. The constants are not part of the actual experiment but altering them can influence its outcome.

A control group is one of the two groups in an experiment (the other being experimental group) that doesn't receive the variable being manipulated (independent variable). The control group is the same as the experimental group except that the independent variable is unchanged in the control group. It is used to make a comparison with the experimental group.

For example, in an experiment to test the effect of sunlight on plant growth. Some plants were exposed to sunlight while some were placed in the dark. The CONTROL group of this experiment are the plants placed in the dark (no light). They didn't receive any treatment.

The constants of this experiment can be same amount of water, same type of plants used etc. This is done in order not to affect the outcome of the experiment.

What is it known as

Answers

Answer:

Some of the most incredible discoveries in science were made because the data looked wrong! Once you have the data, you may need to perform a mathematical analysis to support or refute your hypothesis. Conclusion Conclude whether to accept or reject your hypothesis. There is no right or wrong outcome to an experiment, so either result is fine.

it’s known as the conclusion

Calculate the density from the following information: A red block had a mass of 15.7 g. It was placed into a graduated cylinder containing 10.0 mL of water. The volume then rose to 17.2 mL when the block was added.

Answers

Answer:

Density should be 8.5

Explanation:

When you subtract 17.2-10.0 for water displacement you get 7.2 which is the volume and you divide it by 15.7 so your equation will be 15.7/7.2 = 8.5

Answer:

4.1

Explanation:

What is the best way to represent the number 1,550,000

Answers

Answer:

You can represent as a exponent. That will be the best way.

Explanation:

what type of battery still uses lead?​

Answers

Answer:

Starter batteries

Explanation:

Lead acid batteries (they are used in automotive)

I need y’all helping me with this question?

Answers

Pesticides interfere with biochemical processes in the insects they repel or kill

What is the noble gas notation For zinc


Answers

Answer:

The noble gas notation for zinc would be [Ar]3d^104s^2

Explanation:

I hope this helps you:) let me know if it does make sense, okay?

What is the difference between bulk and particle scale?
Someone please help!!

Answers

Answer:

Particle density is the volumetric mass of the solid soil. It differs from bulk density because the volume used does not include pore spaces. Particle density represents the average density of all the minerals composing the soil.

Hope that helps

Crystal structures with ions must have ____________.a. a positive chargeb. a negative chargec. electrical neutralityd. a 2+ charge

Answers

Answer:

c. electrical neutrality.

Explanation:

A crystalline  solid possesses a rigid and long-range order; its atoms, molecules, or ions occupy  specific positions. The arrangement of such particles in a crystalline solid is such that  the net attractive intermolecular forces are at their maximum.

Ionic crystals, particularly, have two important characteristics:

(1) They are composed of charged species.

(2) Anions and cations are generally quite different in size.

The forces holding the atoms together are electrostatic attractions. Examples of these types of crystals include NaCl, LiF, MgO, CaCO₃.

Since they are composed of anions and cations, in stoichiometric amount, they are to be said electrically neutral.

how is matter and energy conserved when liquid is frozen

Answers

Answer:

The big energy change when water freezes is in the potential energy of interactions between the water molecules.

Explanation:

I am not to sure if this is correct, but I hope it helps in some way.

Find the independent variable and the dependent variable :)))

Answers

Answer:

dependent variable: plant growth

independent: sunlight impact/amount of light

Explanation:

5(3x) - 7y2=?, when x = 3 and y= 2

Answers

Answer:

This might help u......

5(3•3) - 7•2•2
1. 5•9-7•4
2. 45-28 =17
Answer: 17

which part of a plant conducts food and water to different part of it?​

Answers

Answer:

stem is the correct answer

Explanation:

mark as me brainlist

Which statement about melting and boiling points is true? Question 3 options:

A. As you move down group 7A in the periodic table, the melting and boiling points of the elements decrease.

B. As you move up group 8A in the periodic table, the melting and boiling points of the elements increase

. C. Smaller atoms in group 8A require higher boiling points for the molecules to separate from each other than larger atoms in group 8A.

D. Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.

Answers

Answer:

B

Explanation:

I believe it is B but I am not entirely sure! don't do this is B doesn't sound or look right to you!

Answer:

Its D

Explanation:

Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.

What is a key difference between chemical and nuclear reactions?

A. In chemical reactions, new compounds are formed. In nuclear reactions, compounds are destroyed.
B. Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
C. Chemical reactions involve large changes in energy. Nuclear reactions absorb or release small amounts of energy.
D. In chemical reactions, only alpha radiation is emitted. In nuclear reactions, alpha, beta, and gamma decay may occur.

Answers

Answer:

B

Explanation:

Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.

Answer:

B

Explanation:

What is the mass, in grams, of a 12.0cm³ sample of aluminum? The density of aluminum is 2.70g/cm³

Answers

Answer:

The answer is

32.4 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume of aluminum = 12 cm³

Density = 2.70 g/cm³

The mass of aluminum is

mass = 2.7 × 12

We have the final answer as

32.4 g

Hope this helps you

The data were collected over five spring seasons. What is the difference between the number of frogs in the pond when the rainfall was 5 cm and when the rainfall was 20 cm?

Please help​

Answers

Answer: they like deep water

Explanation: they do

Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
OA. There is no change in color.
OB. There is no precipitate formed.
OC. There is no gas given off.
OD. There is no molecular change,

Answers

Explanation:

Physical change can observe by physical appearance

OA = No change in color

other choices are chemistry change

A science student wants to use distillation to separate a mixture of two
substances in the liquid state. For the student to be successful, which property
should be significantly different between the two liquids?
h-
ies
h-
Freezing point
Ability to dissolve a solid substance, such as table sugar
1
Ability to react with oxygen
O Boiling point
et
< Previous
Next

Answers

Answer:

Boiling point

Explanation:

Distillation is one of the most widely used separation technique in chemistry. It is used to separate a mixture of liquid substances with different boiling point. Hence, the basis of the separation is BOILING POINT DIFFERENCE.

In the procedure, the liquid substances are heated until they turn gaseous, which they do at different times considering their different boiling points. The separated components are then converted back to liquid states in a process called CONDENSATION.

convert 500 inches to m.
1000mm =1m
1inch = 2.54 cm
10mm=1cm

Answers

Answer:

12.7m

Explanation:

FORMULA  

for an approximate result, divide the length value by 39.370078

___KClO3--->___KCl+___O2 I need help bro.

Answers

2 KClO3— 2 KCl + 3 O2

explain why the planet Venus rotates the opposite way?

Answers

Answer:

The reason why it rotates the opposite way is due to an asteroid collision forcing the planet to spin backwards and is also the reason why a day on Venus is longer then a year on Venus

it spins in the same direction it always has, just upside down, so that looking at it from other planets makes the spin seem backward

2. A 90 g bag of trail mix is contains 22% nuts, 35% granola, 18% dried fruit. The rest is chocolate chips.
Calculate how many grams of each component there is.
nute

Answers

There are:

19.8g of nuts (90x0.22=19.8)
31.5g of granola (90x0.35=31.5)
16.2g of dried fruit (90x0.18=16.2)
22.5g of chocolate chips (90x0.25=22.5)

Explain how you would test the presence of oxygen and hydrogen gases. ​

Answers

Place a burning splint near the opening of a test tube. If a popping noise occurs, it's probably hydrogen. Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide.
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Convert 45 miles per hour to miles per minute Beasy is driving in his car to take care of some errands. The first errand has himdriving to a coffee shop 2 km East and 6 km North of his starting location. Once hecompletes that errand, he drives to a thrift store which is 4 km East of the first errand.What is the displacement of the car from the starting point, rounded to the nearestkm? 3. Cul es el valor de xx3=100 Which archetype do the two passages have incommon?A)the warriorB)the sageC)the villainD)the tragic heroine please help me. Given the explicit formula for an arithmetic sequence find the 52nd term.a =-41 + 30nA) a52= 1519B) a52= -1541C) a52=-1492D) a52=-1490 Find the quotient.56,000 10 The Grange and Farmers' Alliances were similar inthat theyA.worked to improve railroads' profits.B.focused on placing farmers in debt.C.sought to improve the lives of farmers. Blue Plate Construction organized in December and recorded the following transactions during its first month of operations. Dec. 2 Purchased materials on account for $400,000. Dec. 3 Used direct materials costing $100,000 on job no. 100. Dec. 9 Used direct materials costing $150,000 on job no. 101. Dec. 15 Used direct materials costing $30,000 on job no. 102. Dec. 28 Applied the following direct labor costs to jobs: job no. 100, $9,000; job no. 101, $11,000; job no. 102, $5,000. Dec. 28 Applied manufacturing overhead to all jobs at a rate of 300% of direct labor dollars. Dec. 29 Completed and transferred job no. 100 and job no. 101 to the finished goods warehouse. Dec. 30 Sold job no. 100 on account for $200,000. Dec. 31 Recorded and paid actual December manufacturing overhead costs of $78,000, cash. Dec. 31 Closed the Manufacturing Overhead account directly to Cost of Goods Sold. Required:a. Prepare journal entries for each of the above transactions. b. Compute the amount at which Cost of Goods Sold is reported in the company's income statement for the month ended December 31. c. Determine the inventory balances reported in the company's balance sheet dated December 31. d. Was manufacturing overhead in December overapplied, or was it underapplied? ExerciseYou are going on a family holiday but your brother / sister cannot come. Your parents have saidyou can invite a friend instead.Write an email to your friend, inviting him / her to join you on holiday with your family.In your email, you should:explain why your brother / sister is unable to comedescribe where you are going and what you plan tosay why you think your friend should come.The pictures above may give you some ideas, and you should try to use some ideas of your own. 3. At the start of summer, Ben has $250 . He takes a summerjob and saves $ 150 per week. Tim has $ 1,650 at the start ofsummer , he travels and spends $ 200 per week. At the end ofwhich week do Ben and Tim have the same amount of money ? In recent years, foreign firms were reluctant to merge with or acquire American corporations.a. Trueb. False The measurement attribute that is based on future cash flows discounted for the time value of money is Which leader was defeated by Francisco Pizarro?BartolomMontezumaCortsAtahualpa Amy invested $250 in the bank and a year later has $285.72. By what percent has the amount changed? In general, how did employers feel about unions? What is the solution to the linear equation? - +5- X6x = -5Ox=0 x=Ox=5 we are indebted to greece because we know that we have the right to do what? The volume of a volleyball is about 288 cubic inches. what is the radius of the volleyball, to the nearest tenth of an inch? use 3.14 for .[tex]r = \sqrt{ \frac{3v}{4\pi} } [/tex] what were the ideas that thomas Jefferson instituted in the Declaration of Independence ? Which three logical predictions can be made after reading this passage?