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3 years ago

A plant's growth response to water is called _____.

Chemistry

1 answer:

tamaranim1 [39]3 years ago

6 0

Answer:

A or Hydrotropism

Explanation:

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A rectangular solid measures 1.0m by 5.6cm by 2.1mm express its volume in cubic meters

Lemur [1.5K]

First, make sure all three measurements have the same unit (I recommend meters because that's what the question calls for)

1.0m=1.0m
5.6cm=0.056m
2.1mm=0.0021m

Then, you just want to multiply the three together to get the total volume.
1.0X0.056X0.0021=0.0001176 or 0.00012, if your teacher wants you to use proper sig figs

6 0

4 years ago

Read 2 more answers

25 g of a chemical is dissolved in 75 g of water. What is the percent by mass concentration of this chemical

Zanzabum

Answer:

300

Explanation:

4 0

3 years ago

A neutral isotope has 49 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number an

Marta_Voda [28]

Explanation:

In an atom , the relation between the subatomic particles of the atom are given as follows -

For a neutral atom ,

Atomic number = number of protons = number of electrons ,

Mass number = number of protons + number of neutrons,

Hence , from the given information of the question,

number of neutrons = 49 ,

number of electrons = 36 ,

Hence , by using the above relation,

Atomic number = 36

number of protons = 36

Since ,

Mass number = number of protons + number of neutrons

Mass number = 36 + 49 = 85 .

By taking the help of periodic table , as atomic number = 36 ,

The elements is Krypton ( Kr )

Kr ⁸⁵₃₆

4 0

4 years ago

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. For example, if you are asked to add 14.3 g

tensa zangetsu [6.8K]

Answer: Set with equal densities are:

15.2 g copper and 50.0 g copper ; 11.2 g gold and 14.9 g gold

Explanation:

Density is defined as mass of the substance present in unit volume of the substance.

$Density=\frac{Mass}{Volume}$

It is an intensive property which means that two different masses of same substance will have same value of density under same conditions.

So, from the given samples with equal density are:

15.2 g copper and 50.0 g copper will have the same value density.

11.2 g gold and 14.9 g gold will have the same value density.

6 0

3 years ago

Read 2 more answers

A chemistry student needs 60.0 ml of ethanolamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, th

BARSIC [14]

Answer:

The student should weigh out 61.2g of ethanolamine [6.12 * 10]

Explanation:

In this question, we are expected to calculate the mass of ethanolamine needed to make 60.0ml of it given that the density of the ethanolamine in question is 1.02g/cm^3

Mathematically, it has been shown that mass = density * volume

Hence, by multiplying the density by the volume, we get the mass.

Now, from the question we can see that we have the values for the density and the volume. We now need to get the mass.

Since cm^3 is same as ml, we need not perform any conversion.

Hence, the needed mass is:

60 * 1.02 = 61.2g

6 0

4 years ago