Help me find the answer please

Which of the items shown here will protect you from a chemical burn? Select all that apply.

A hand in a rubber glove.
A fire extinguisher.
A pair of glasses with clear shields attached on the sides.
A power source.

Answer:

as a lipid bilayer

Explanation:

just took the test

Answer:

A. as a lipid bilayer

Answer:

Independent variable, is the amount of salt water received by each plant

Dependent variable, is the height of each plant

Control group, is the fourth plant that received pure water.

Note: The question is incomplete. The complete question is as follows: For the following experiments, define the independent variable (IV), dependent variable (DV) and control group (CG).

2. You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.

Explanation:

Independent variable: An independent variable is a variable that an experimenter changes or controls and which has a direct effect on the dependent variable.

In the experiment above, the independent variable is the amount of salt water received by each plant because it is under the control of the experimenter and also is thought to have a direct effect on the height of plants.

Dependent variable: A dependent variable is a variable that is being measured or studied in an experiment, and it depends on the independent variable for its results.

The height of the plants is the dependent variable as it depends on the amount of salt water the plant receives.

Control group: The control group is the group in an experiment or study that does not receive the treatment as the other groups being studied and as such, is not influenced by the independent variable. Therefore, it is used as a standard for the other groups under study.

In this experiment, the control group is the fourth plant that received pure water.

Answer:

the one at the bottom

Explanation:

the more dense an object is in this kind of demonstration (which is called a density tower btw) the lower it'd be so taking this reason into consideration the lowest would be the densest

Answer:

Universal law of gravitation

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 6.05 g

volume = 19 mL

The density of the substance is

[tex]density = \frac{6.05}{19} \\ = 0.3184210526...[/tex]

We have the final answer as

Hope this helps you

Answer:

i really dont know

Explanation:

byeeeeeeeeeeeee

Answer:

A) Cu

(copper)

Complete question is;

Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper) is called what?

Molding is what a child does with Play-Doh or origami

Answer:

Modeling

Explanation:

In chemistry, we have a branch called modeling chemistry. In modeling, we organize together a series of models instead of a collection of topics. In this approach, we will begin with a phenomena that can be readily observed and are gradually develop the simplest model of matter that helps us make sense of our observations.

Now in the question, we are Molding a shape from soft, malleable materials like clay/plaster or constructing from harder materials like metal/paper. This means that we are organizing a series of models from either soft & malleable or harder materials to produce a simple model shape.

Thus, this is simply modeling.

Answer:

False

Explanation:

Answer:

:0

Explanation:

Answer:

A. 8.8 g.

B. 5.3 g.

C. 449 g.

Explanation:

A. Determination of the mass of CO2.

Mole of CO2 = 0.2 mole

Molar mass of CO2 = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO2 =?

Mole = mass /Molar mass

0.2 = mass of CO2 /44

Cross multiply

Mass of CO2 = 0.2 × 44

Mass of CO2 = 8.8 g

B. Determination of the mass of Na2CO3.

Mole of Na2CO3 = 0.05 mole

Molar mass of Na2CO3 = (2×23) + 12 + (3×16)

= 46 + 12 + 48

= 106 g/mol

Mass of Na2CO3 =?

Mole = mass /Molar mass

0.05 = mass of Na2CO3 /106

Cross multiply

Mass of Na2CO3 = 0.05 × 106

Mass of Na2CO3 = 5.3 g

C. Determination of the mass of Fe(OH)2.

Mole of Fe(OH)2 = 5 moles

Molar mass of Fe(OH)2 = 55.8 + 2(16 + 1)

= 55.8 + 2(17)

= 55.8 + 34

= 89.8 g/mol

Mass of Fe(OH)2 =?

Mole = mass /Molar mass

5 = mass of Fe(OH)2/89.8

Cross multiply

Mass of Fe(OH)2 = 5 × 89.9

Mass of Fe(OH)2 = 449 g.

Answer:

negative

Explanation:

Any atom whose number electrons are more than the number of protons in it will have a negative charge. Since in this case the electrons are 10 and protons are 9 the 9+ charge protons and 9- charge electrons cancel each other giving a final charge of negative.

The charge of an ion with 9 protons and 10 electrons and neutrons is -1 as there is one more electron in comparison to number of protons .

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.They are attracted to opposite charges.

Learn more about ions,here:

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Answer:

A

Explanation:

What must happen in order for a chemical reaction to be specifically classified as endothermic instead of exothermic is that energy is absorbed in the form of heat.

Chemical reactions can be exothermic or endothermic depending on whether it gives off or absorb energy (in the form of heat).

When energy is given off by a reaction, the temperature of the reaction vessel becomes warmer than the initial temperature before the reaction. Such a reaction is said to be exothermic.

For endothermic reactions, heat energy is absorbed from the surrounding. Thus, the reaction vessel appears colder when compared to the initial temperature before the reaction.

More on exothermic and endothermic reactions can be found here: https://brainly.com/question/4345448

Answer:

m= 6780mg = 6.78g = 6.8g

d= 6.8g/ml

V= m/d

V= 1ml

Answer:form when magma and lava cool :/

Explanation:hope this helps, and I’m this because ingenious rocks are made/ formed from magma and lava.

The phrase which best describes igneous rocks is option A, .i.e., it forms when lava and magma cool.  

Igneous rocks are formed by the melting of  earth's crust  into magma, . The two types of this rocks are, Extrusive and intrusive igneous rocks . The slow cooling of magma beneath the surface results in intrusive igneous rock.

Magma in the crystal is in molten liquid state which heat by convection and flows out. This creates slight movement in plates and the hot mantle the cools down to form igneous crystals.

Extrusive igneous rock is created when lava above the surface cools quickly. The magma hardens more quickly after being brought to the surface via cracks or volcanic explosions. As a result, these rocks are crystalline, smooth, and fine-grained.

Thus regarding the formation of igneous rocks, option A is correct.

To learn more about igneous rocks, refer the link below:

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Answer:

D is the answer

Answer:

you man get different results

Answer:

c

Explanation:

the input of the mass is always equal to the mass of the outputs

Answer:

The correct answer is C

Explanation:

I did C like they said and it was correct!

Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

(if this help pls mark as brainliest :))

Answer:

Number of protons

Explanation:

Isotopes are the same atom of an element with same

number of protons but different number of Neutrons.

Answer:

The answer is B

Both are used for energy storage, but only carbohydrates are used for short-term energy storage.

Explanation:

hope it helps

got it right on edge

i just submitted it and got it right

Both are used for energy storage, but only carbohydrates are used for short-term energy storage.

MACROMOLECULES:

Therefore, both macromolecules are used for energy storage, but only carbohydrates are used for short-term energy storage.

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Answer: Thomson - C

Rutherford - B

Bohr - A

Explanation: I just took the quiz

Answer:

carbon dioxide is acidic and when it comes in contact with blue litmus paper it turns red

Explanation:

Answer:

It would be

a) Scarcity affects all societies.

Answer:

Explanation:

Molecular formula of penicillin  = C₁₆ H₁₈ N₂ O₄S

No of hygrogen atoms = 36

No of molecules = 36 / 18 = 2

molecular weight = 334 amu

molecular weight of 2 molecules = 334 x 2 = 668 amu.  

density = 2.013g/cm3

Explanation:

density = mass/volume

density = 453g/225cm3

density = 2.013g/cm3

Answer:

Chemical energy is transferred to molecules of ATP and used to carry out life processes

AND

Some chemical energy is transformed into thermal energy.

Explanation:

During Cellular respiration, Some chemical energy is transformed into thermal energy and rest Chemical energy is transferred to molecules of ATP and used to carry out life processes.Hence, Option (A) and (D) are correct

Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from nutrients into adenosine triphosphate, and then release waste products.

Therefore, During Cellular respiration, Some chemical energy is transformed into thermal energy and rest Chemical energy is transferred to molecules of ATP and used to carry out life processes. Hence, Option (A) and (D) are correct

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Answer:

if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m

Explanation:

we know,

1m= 1000mm

as given 5X 10^3 mm we have to convert to meter

now  5X 10^3 mm= 5X 10^3/1000=5m

but if its  5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m

thank u,

Answer:

OH-

Explanation:

it's consists of an oxygen and hydrogen atom held together by a covalent bond and carries a negative electric charge