Pls help i will mark brainlist

You need to do a research paper on global warming which of the following would be a reliable source for the information you need

Ahat [919]

C is obvious because no other choice has any closer answer

4 0

4 years ago

How might a living and a nonliving element in a forest interact?

poizon [28]

Answer:

I believe the answer is: C a bear living in a hollowed-out log.

Because:

The bear is living and the hollowe-out-log isn't.

6 0

2 years ago

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The following models illustrate chemical reactions between X (red atoms) and Y (blue atoms). The "?" mark in each frame represen

Yuri [45]

The frames are shown below.

Answer:

Part 1: Starting material = 5X and 8Y, ? = 1X;

Part 2: Starting material = 4X₂ and 3Y₂, ? = 1X₂;

Part 3: Starting material = 4X₂ and 4Y₂, ? = 2X₂;

Part 4: Starting material = 2X₂ and 3Y₂X, ? = X.

Explanation:

Part 1

Each ball represents one atom, thus there are 5X and 8Y as starting materials. In the products there's 4X and 8Y forming 4 Y₂X, so ? = 1X.

Part 2

In this case, there are presented X₂ and Y₂ because the atoms are joined together, so the starting material is 4X₂ and 3Y₂. In the product, there are 6 YX, so it reacts 3X₂ and 3Y₂, and ? = 1 X₂.

Part 3

As in part 2 the atoms are joined together, so there are 4X₂ and 4Y₂. In the product, there are 4Y₂X, so it reacts 2X₂ and 4Y₂, so ? = 2X₂.

Part 4

The starting material now is 2X₂ and 3Y₂X, the product is 3Y₂X₂, so it reacts 3Y₂X and 3/2 X₂, thus ? = 1X.

6 0

3 years ago

A 0.435 g sample of a metal, M, reacts completely with sulfuric acid according to M ( s ) + H 2 SO 4 ( aq ) ⟶ MSO 4 ( aq ) + H 2

Tresset [83]

<u>Answer:</u> The molar mass of metal is 52.4 g/mol

<u>Explanation:</u>

To calculate the moles of hydrogen gas collected, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the hydrogen gas = Total pressure - vapor pressure of water = (756.0 - 23.8 ) torr = 732.2 torr

V = Volume of the gas = 201 mL = 0.201 L (Conversion factor: 1 L = 1000 mL)

T = Temperature of the gas = $25^oC=[25+273]K=298K$

R = Gas constant = $62.364\text{ L.mmHg }mol^{-1}K^{-1}$

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

$732.2torr\times 0.210L=n\times 62.364\text{ L. torr }mol^{-1}K^{-1}\times 298K\\\\n=\frac{732.2\times 0.210}{62.364\times 298}=0.0083mol$

The given chemical equation follows:

$M(s)+H_ 2SO_4(aq.)\rightarrow MSO_4(aq.)+H_2(g)$

By Stoichiometry of the reaction:

1 mole of hydrogen gas is formed by 1 mole of metal

So, 0.0083 moles of hydrogen gas will be formed by = $\frac{1}{1}\times 0.0083=0.0083mol$ of metal

To calculate the molar mass of metal from given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of metal = 0.0083 moles

Given mass of metal = 0.435 g

Putting values in above equation, we get:

$0.0083mol=\frac{0.435g}{\text{Molar mass of metal}}\\\\\text{Molar mass of metal}=\frac{0.435g}{0.0083mol}=52.4g/mol$

Hence, the molar mass of metal is 52.4 g/mol

7 0

3 years ago

Which solubility curve on the right best represents the data table on the left?

Ksenya-84 [330]

Answer:

blue curve

Explanation:

edge 2021

6 0

3 years ago

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